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109 results on '"M. HAPKE"'

1. Search for anomalous production of acoplanar di-lepton events in ${\rm e^+e^-}$ collisions at $\sqrt{s} =$ 183 and 189 GeV

Author: P. Ferrari, Randall Sobie, H. Mes, Naoko Kanaya, R. J. Hemingway, G. D. Lafferty, I. P. Duerdoth, S. Braibant, J. Lillich, Christopher Hawkes, German Martinez, K. Stephens, H. O. Ogren, B. W. Kennedy, P. Jovanovic, C. Littlewood, Christoph Geich-Gimbel, Gideon Bella, K. Stoll, Andris Skuja, S. Petzold, Austin Ball, Guenter Duckeck, A. A. Faust, P. Hüntemeyer, Daniel Lellouch, L. Brigliadori, H. J. Burckhart, Jacqueline Batley, Peter R Hobson, D. Zer-Zion, Takehiko Mori, Peter Krieger, Vakhtang Kartvelishvili, Tetsuro Mashimo, S. W. O'Neale, M. F. Turner-Watson, K. J. Anderson, Sachio Komamiya, A. Okpara, P. Mättig, T. J. McMahon, Richard Teuscher, R. Kowalewski, Erez Etzion, M. A. Thomson, A. T. Watson, Matthias Schröder, D. E. Plane, F. Fiedler, M. Thiergen, J. E. Conboy, A. Fürtjes, S. Arcelli, Alessandro Montanari, I. Meyer, C. Couyoumtzelis, T. P. Kokott, J. Dubbert, D. Waller, E. K. U. Gross, M. Verzocchi, W. Gorn, R. K. Carnegie, Shlomit Tarem, Lutz Feld, R. Van Kooten, T. Saeki, G. M. Dallavalle, Alessandra Fanfani, R. Davis, G. Gaycken, P. G. Bright-Thomas, J. A. Wilson, M. Sproston, C. R. Jones, J. Böhme, B. Surrow, M. Schumacher, M. Boutemeur, F. S. Merritt, Gideon Alexander, Thomas E Marchant, Paolo Capiluppi, Michael Hildreth, Achim Stahl, I. Trigger, Stefan Schmitt, Alain Bellerive, M. Kolrep, N. L. Rodning, T. Kuhl, Paul Kyberd, F. K. Loebinger, P. Dervan, S. Yamashita, P. Scharff-Hansen, B. Poli, F. Odorici, K. Graham, F. Wäckerle, D. R. Ward, Tara Shears, H. Voss, R. J. Barlow, Georges Azuelos, Ivor Fleck, Richard Nisius, B. List, Ekg Sarkisyan, D. M. Gingrich, P. Igo-Kemenes, E. Tsur, Ehud Duchovni, D. Axen, A. Jawahery, Oana Elena Vickey Boeriu, J. Grunhaus, J. Bechtluft, J. A. McKenna, D. J. Miller, Joleen Pater, K. W. Bell, J. Goldberg, Dave Charlton, Marco Cuffiani, K. Ishii, H. Jeremie, S. B. Anderson, Shoji Asai, M. Jimack, A. M. Smith, K. Hoffman, A. Klier, A. Michelini, Juergen Thomas, M. Przybycień, H. A. Neal, M. Fanti, T. Kress, J. C. Hill, J. M. Roney, S. Spagnolo, A. M. Rossi, W. R. Gibson, W. J. McDonald, B. C. Shen, A. A. Carter, I. J. Bloodworth, M. Donkers, Kiyotomo Kawagoe, K. Harder, Siegfried Bethke, D. Liu, A. K. Honma, Robert McPherson, Paolo Giacomelli, T. Kobayashi, Stan Bentvelsen, O. Schaile, M. Hansroul, Koichi Nagai, John Allison, W. G. Scott, J. Schieck, R. Hawkings, I. Nakamura, H. Landsman, Peter Sherwood, I. Cohen, R. D. Heuer, Christoph Rembser, James Pinfold, S. Robertson, Yoram Rozen, W. Mohr, Fabrizio Fabbri, A. Frey, R. Perez-Ochoa, R. Seuster, Giovanni Abbiendi, A. J. Martin, Claudia Ciocca, M. Harin-Dirac, S. A. Robins, R. L. Coxe, T. Trefzger, R. J. Homer, R. G. Kellogg, Junichi Kanzaki, J. Polok, R. M. Brown, D. Karlen, D. R. Rust, P. Mendez-Lorenzo, F. G. Oakham, R. Liebisch, K. Ackerstaff, Alexander Wagner, A. Macchiolo, J. Ludwig, A. Hocker, Daniele Bonacorsi, K. Runge, P. Bock, Lorne Levinson, Csaba Hajdu, D. Glenzinski, Dezso Horvath, M. J. Losty, Stefano Marcellini, E. L. Barberio, D. Chrisman, G. D. Long, V. Zacek, K. R. Hossain, W. M. Sang, J. Couchman, W. Mader, O. C. Cooke, P. Pfeifenschneider, J. W. Gary, Marcello Mannelli, C. K. Hargrove, Stephen Lloyd, J. Patt, D. C. Imrie, André Schöning, C. H. Shepherd-Themistocleous, J. von Krogh, O. Sahr, C. Sbarra, F. R. Jacob, G. P. Siroli, M. Gruwé, D. Wetterling, Christoph Schwick, K. Roscoe, P. Gagnon, S. Baumann, E. Torrence, Zoltan Laszlo Trocsanyi, E. Clay, Dong Hee Kim, J. Lauber, E. A. Mckigney, S. D. Talbot, T. Behnke, Satoshi Mihara, T. R. Junk, D. Lanske, D. I. Futyan, P. S. Wells, Terry Richard Wyatt, O. Runolfsson, P. G. Estabrooks, R. K. Keeler, N. K. Watson, Arnulf Quadt, P. M. Watkins, Claudio Grandi, J. S. White, M. Fierro, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, A. D. Schaile, Gabriella Pasztor, J. Lu, P. Vannerem, G. A. Snow, C. P. Ward, Raimund Ströhmer, S. Söldner-Rembold, P. Poffenberger, Beatrix Dienes, J. Letts, C. Y. Chang, P. Taras, A. Macpherson, K. Sachs, Shlomo Dado, Giora Mikenberg, Klaus Desch, S. F. Ashby, R. Howard, Otmar Biebel, P. I. Kayal, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, S. Betts, M. Hapke, M. J. Oreglia, Gregor Herten, J. E. Pilcher, A. W. Lloyd, G. W. Wilson, M. Hauschild, S.J. Dallison, J. R. Carter, G. N. Patrick, A. Biguzzi, J. G. Layter, P. E.L. Clarke, J. P. Martin, S. De Jong, H. Rick, G. G. Hanson, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, M. S. Dixit, and Frans Meijers
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Standard Model, Nuclear physics, Chargino, Neutralino, Higgs boson, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Minimal Supersymmetric Standard Model, Lepton
Abstract: A selection of di-lepton events with significant missing transverse momentum has been performed using a total data sample of 237.4 pb-1 at e+e- centre-of-rnass energies of approximately 183 GeV and 189 GeV. The observed numbers of events - 78 at 183 GeV and 301 at 189 GeV - are consistent with the numbers expected from Standard Model processes, which arise predominantly from W+W- production with both W bosons decaying leptonically. This topology is also an experimental signature for the pair production of new particles that decay to a charged lepton accompanied by one or more invisible particles. Discrimination techniques are described that optimise the sensitivity to particular new physics channels. No evidence for new phenomena is apparent. Upper limits on the production cross-section times branching ratio squared for sleptons and for leptonically decaying charginos and charged Higgs are presented in a manner intended to minimise the number of model assumptions. Assuming a 100% branching ratio for the decay l±R → l±χ01, where χ01 is the lightest neutralino, we exclude at 95% CL: right-handed smuons with masses below 82.3 GeV for mμ- - mχ01 > 3 GeV and right-handed staus with masses below 81.0 GeV for mτ- -mχ01 > 8 GeV. Right-handed selectrons are excluded at 95% CL for masses below 87.1 GeV for mẽ - mχ01 > 5 GeV, within the framework of the Minimal Supersymmetric Standard Model assuming μ, < - 100 GeV and tan β= 1.5. Charged Higgs bosons, H±, are excluded at 95% CL for masses below 82.8 GeV, assuming a 100% branching ratio for the decay H± → τ ± vτ.
Published: 2000
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2. A study of parton fragmentation in hadronic Z $^0$ decays using $\Lambda\bar\Lambda$ correlations

Author: B. Nellen, H. G. Evans, I. Cohen, Tara Shears, Christoph Rembser, C. Hartmann, D. E. Plane, T. J. McMahon, C. Couyoumtzelis, Stephen Hillier, G. Gaycken, P. G. Bright-Thomas, J. Dubbert, G. M. Dallavalle, S. A. Robins, R. K. Carnegie, M. Schumacher, M. Herndon, M. Bobinski, R. Liebisch, K. Stoll, P. G. Estabrooks, R. K. Keeler, J. A. Wilson, J. Böhme, Andris Skuja, K. Ackerstaff, Matthias Schröder, M. Thiergen, Gregor Herten, N. K. Watson, Dave Charlton, S. Petzold, P. M. Watkins, D. Lazic, A. Macpherson, M. Fierro, Randall Sobie, G. D. Lafferty, A. J. Martin, F. Odorici, Tetsuro Mashimo, S. R. Lautenschlager, J. Grunhaus, W. Mader, Erez Etzion, C. K. Hargrove, S. Betts, M. Hapke, S. Yamashita, J. E. Pilcher, Stefan Kluth, Shlomit Tarem, Stefan Schmitt, K. Roscoe, H. A. Neal, R. Bürgin, B. Surrow, C. Y. Chang, D. R. Rust, A. W. Lloyd, P. Igo-Kemenes, Georges Azuelos, P. E.L. Clarke, O. Runolfsson, A. D. Schaile, Gabriella Pasztor, E. Tsur, P. Vannerem, M. J. Oreglia, Klaus Kurt Desch, G. W. Wilson, W. Gorn, K. Ishii, H. Jeremie, M. Hauschild, C. Markopoulos, John Allison, J. Lauber, G. Yekutieli, S. Baumann, M. Przybycień, Guenter Duckeck, Sachio Komamiya, A. T. Watson, A. A. Carter, R. Howard, M. Verzocchi, K. W. Bell, P. Taras, Ron Folman, A. M. Lee, E. von Törne, E. A. Mckigney, E. Torrence, Claudio Grandi, J. S. White, J. Pálinkás, T. P. Kokott, G. A. Snow, C. P. Ward, J. P. Martin, J. R. Carter, S. Söldner-Rembold, G. N. Patrick, R. Mir, R. Hawkings, Otmar Biebel, E. Clay, Shoji Asai, Gideon Bella, Ekg Sarkisyan, T. Saeki, R. Davis, J. C. Hill, J. Letts, M. Fanti, O. Schaile, H. J. Burckhart, Daniel Lellouch, D. I. Futyan, Jacqueline Batley, P. I. Kayal, Takehiko Mori, H. Mes, James Pinfold, R. Perez-Ochoa, R. Seuster, Giovanni Abbiendi, S. De Jong, Claire Shepherd-Themistocleous, S. Robertson, Daniele Bonacorsi, S. B. Anderson, K. Sachs, Shlomo Dado, I. P. Duerdoth, S. Braibant, Norbert Wermes, Sherry Towers, T. Kawamoto, W. J. McDonald, W. R. Gibson, B. C. Shen, Robert McPherson, M. Boutemeur, F. S. Merritt, D. M. Strom, P. Mättig, J. Gascon, S. Orito, K. Harder, F. G. Oakham, B. Schmitt, E. L. Barberio, R. E. Schmitz, R. D. Heuer, Fabrizio Fabbri, Sven Menke, D. Lanske, Siegfried Bethke, D. Liu, Giora Mikenberg, S. F. Ashby, H. Rick, V. Zacek, R. Van Kooten, Stan Bentvelsen, J. von Krogh, P. Hüntemeyer, Raimund Ströhmer, R. J. Hemingway, A. A. Faust, A. K. Honma, W. G. Scott, S. D. Talbot, J. W. Gary, C. R. Jones, D. S. Koetke, R. M. Brown, Lorne Levinson, M. F. Turner-Watson, M. Gruwé, L. A. del Pozo, Marcello Mannelli, Peter R Hobson, I. Nakamura, B. W. Kennedy, P. Jovanovic, D. M. Gingrich, P. Scharff-Hansen, J. Bechtluft, Richard Teuscher, I. J. Bloodworth, D. Zer-Zion, A. S. Turcot, F. Fiedler, P. Poffenberger, J. A. McKenna, T. R. Junk, D. Eatough, Austin Ball, Peter Krieger, A. Macchiolo, A. M. Smith, P. S. Wells, D. Glenzinski, Dezso Horvath, M. J. Losty, R. G. Kellogg, G. G. Hanson, Jean-Arcady Meyer, Terry Richard Wyatt, C. M. Hawkes, Yoram Rozen, M. Kolrep, T. Behnke, R. Bartoldus, Alessandro Montanari, T. Kuhl, H. O. Ogren, J. Polok, G. Giacomelli, I. Lawson, Richard Nisius, Christoph Geich-Gimbel, D. Karlen, A. De Roeck, M. Kobel, O. C. Cooke, Beatrix Dienes, B. List, Marco Cuffiani, P. Pfeifenschneider, M. S. Dixit, Frans Meijers, Vakhtang Kartvelishvili, J. E. Conboy, A. Fürtjes, P. Gagnon, Stefano Marcellini, L. Brigliadori, N. Altekamp, H. Voss, R. J. Barlow, A. Biguzzi, D. J. Miller, J. Patt, J. G. Layter, A. Sittler, Zoltan Laszlo Trocsanyi, André Schöning, O. Sahr, W. M. Sang, S. W. O'Neale, K. J. Anderson, S. D. Bird, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Paolo Giacomelli, C. Sbarra, F. R. Jacob, M. Hansroul, Paul Kyberd, F. K. Loebinger, J. Steuerer, Ivor Fleck, C. Burgard, Joleen Pater, A. Klier, R. J. Homer, Satoshi Mihara, Kiyotomo Kawagoe, Achim Stahl, K. R. Hossain, D. C. Imrie, G. P. Siroli, K. Stephens, Christoph Schwick, C. Littlewood, V. Gibson, I. Trigger, F. Scharf, German Martinez, D. R. Ward, T. Kress, J. M. Roney, Ehud Duchovni, Koichi Nagai, J. Schieck, W. Mohr, M. Jimack, M. A. Thomson, A. Michelini, Claudia Ciocca, F. Wöckerle, E. K. U. Gross, M. Sproston, S. M. Gascon-Shotkin, Satoshi Tanaka, T. Kobayashi, A. M. Rossi, R. L. Coxe, A. Hocker, D. Chrisman, G. D. Long, Volker Blobel, Michael Hildreth, Alain Bellerive, Stephen Lloyd, N. L. Rodning, R. Kowalewski, S. Arcelli, Gideon Alexander, Paolo Capiluppi, and J. Goldberg
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Hyperon, Parton, Lambda, Lambda baryon, Nuclear physics, Baryon, High Energy Physics::Experiment, Rapidity, Engineering (miscellaneous)
Abstract: The correlated production of $\Lambda$ and $\bar\Lambda$ baryons has been studied using 4.3 million multihadronic ${\rm Z}^0$ decays recorded with the Opal detector at Lep. Lambda pairs were investigated in the full data sample and for the first time also in 2-jet and 3-jet events selected with the $k_\perp$ algorithm. The distributions of rapidity differences from correlated $\Lambda\bar\Lambda$ pairs exhibit short-range, local correlations and prove to be a sensitive tool to test models, particularly for 2-jet events. The Jetset model describes the data best but some extra parameter tuning is needed to improve agreement with the experimental results in the rates and the rapidity spectra simultaneously. The recently developed modification of Jetset, the MOdified Popcorn Scenarium (Mops), and also Herwig do not give satisfactory results. This study of di-lambda production in 2- and 3-jet events supports the short-range compensation of quantum numbers.
Published: 2000
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3. A study of $\mathrm{B_s^0}$ meson oscillation using hadronic $\mathrm Z^0$ decays containing leptons

Author: H. O. Ogren, Erez Etzion, Christoph Geich-Gimbel, Shlomit Tarem, Sachio Komamiya, D. Axen, S. Yamashita, A. T. Watson, A. Jawahery, B. Surrow, Richard Teuscher, P. Igo-Kemenes, Vakhtang Kartvelishvili, F. Fiedler, A. Biguzzi, J. E. Conboy, A. Fürtjes, J. G. Layter, K. Ishii, H. Jeremie, Peter Sherwood, Daniele Bonacorsi, J. von Krogh, M. Gruwé, D. Wetterling, T. P. Kokott, T. Saeki, Lutz Feld, Kiyotomo Kawagoe, O. C. Cooke, Alexander Wagner, A. Macchiolo, W. R. Gibson, P. Pfeifenschneider, T. J. McMahon, C. Couyoumtzelis, S. Betts, A. Macpherson, J. Dubbert, J. Ludwig, M. Hapke, K. Harder, S. A. Robins, R. Liebisch, K. Ackerstaff, J. Letts, R. K. Carnegie, G. Gaycken, P. G. Bright-Thomas, J. A. Wilson, J. Böhme, Raimund Ströhmer, M. Kolrep, Alessandra Fanfani, R. Davis, S. Baumann, K. Runge, P. Bock, M. Przybycień, T. Kress, E. A. Mckigney, A. A. Carter, I. J. Bloodworth, J. Patt, André Schöning, O. Schaile, W. J. McDonald, Giovanni Abbiendi, M. Schumacher, Matthias Schröder, B. C. Shen, R. J. Hemingway, M. A. Thomson, J. Lauber, M. Boutemeur, F. S. Merritt, O. Sahr, Klaus Desch, P. E.L. Clarke, R. Howard, S. Robertson, P. Poffenberger, Siegfried Bethke, D. Liu, A. K. Honma, K. R. Hossain, C. H. Shepherd-Themistocleous, K. Sachs, Christopher Hawkes, W. M. Sang, S. B. Anderson, Shlomo Dado, J. Grunhaus, E. K. U. Gross, R. L. Coxe, M. Thiergen, F. Odorici, W. G. Scott, Yoram Rozen, J. P. Martin, B. W. Kennedy, T. Kuhl, S. De Jong, I. Nakamura, Richard Nisius, J. Goldberg, J. Bechtluft, M. Sproston, P. Jovanovic, M. J. Oreglia, Stan Bentvelsen, Austin Ball, K. Stoll, S. D. Talbot, R. M. Brown, Lorne Levinson, Andris Skuja, Peter Krieger, B. List, H. Rick, Marco Cuffiani, P. Mendez-Lorenzo, Junichi Kanzaki, J. Polok, D. I. Futyan, Gregor Herten, K. Hoffman, Giora Mikenberg, S. F. Ashby, D. Glenzinski, Paolo Giacomelli, D. Karlen, T. Behnke, R. D. Heuer, Alessandro Montanari, Daniel Lellouch, T. R. Junk, P. S. Wells, M. Hansroul, Beatrix Dienes, A. Hocker, J. A. McKenna, I. Cohen, S. Petzold, Juergen Thomas, Tetsuro Mashimo, M. F. Turner-Watson, A. D. Schaile, Randall Sobie, G. D. Lafferty, R. Hawkings, Christoph Rembser, Dezso Horvath, M. J. Losty, Takehiko Mori, A. Okpara, Terry Richard Wyatt, P. Mättig, G. D. Long, G. G. Hanson, C. Y. Chang, Gabriella Pasztor, P. Gagnon, H. Landsman, J. M. Roney, M. Verzocchi, J. E. Pilcher, H. Mes, P. G. Estabrooks, R. K. Keeler, N. K. Watson, M. Harin-Dirac, P. Vannerem, G. A. Snow, C. P. Ward, D. C. Imrie, R. J. Homer, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, Arnulf Quadt, Naoko Kanaya, P. M. Watkins, Guenter Duckeck, A. Sittler, Zoltan Laszlo Trocsanyi, I. P. Duerdoth, S. Braibant, F. G. Oakham, P. Taras, Dong Hee Kim, Koichi Nagai, J. Schieck, C. Sbarra, F. R. Jacob, Stefan Schmitt, G. P. Siroli, S. Söldner-Rembold, W. Gorn, J. R. Carter, G. N. Patrick, E. L. Barberio, A. J. Martin, M. S. Dixit, Stephen Lloyd, Frans Meijers, Satoshi Mihara, P. Hüntemeyer, Christoph Schwick, K. Roscoe, W. Mohr, John Allison, Otmar Biebel, Georges Azuelos, E. Tsur, Shoji Asai, P. Scharff-Hansen, A. A. Faust, Achim Stahl, O. Runolfsson, K. W. Bell, N. Altekamp, H. Voss, A. W. Lloyd, E. Torrence, R. J. Barlow, D. J. Miller, J. Couchman, W. Mader, Ehud Duchovni, A. M. Smith, R. G. Kellogg, K. Stephens, J. C. Hill, E. Clay, C. K. Hargrove, K. Graham, G. W. Wilson, M. Jimack, Csaba Hajdu, S. Spagnolo, C. Littlewood, Tara Shears, P. I. Kayal, Claudio Grandi, J. S. White, Stefano Marcellini, M. Hauschild, German Martinez, Ekg Sarkisyan, James Pinfold, L. Brigliadori, R. Perez-Ochoa, R. Seuster, V. Gibson, A. Michelini, Norbert Wermes, Sherry Towers, D. E. Plane, T. Kawamoto, D. Lanske, V. Zacek, Paul Kyberd, F. K. Loebinger, I. Trigger, T. Kobayashi, J. W. Gary, J. Steuerer, Ivor Fleck, D. R. Ward, S. Orito, G. M. Dallavalle, Marcello Mannelli, Joleen Pater, A. Klier, H. A. Neal, M. Fierro, R. Kowalewski, S. W. O'Neale, S. Arcelli, K. J. Anderson, Gideon Alexander, Paolo Capiluppi, Gideon Bella, H. J. Burckhart, Jacqueline Batley, C. R. Jones, M. Fanti, Peter R Hobson, D. Zer-Zion, Robert McPherson, Fabrizio Fabbri, A. Frey, R. Van Kooten, Claudia Ciocca, F. Wäckerle, D. M. Gingrich, A. M. Rossi, Michael Hildreth, Alain Bellerive, N. L. Rodning, P. Dervan, B. Poli, D. R. Rust, S. Rosati, A. Harel, Ikuo Ueda, D. M. Strom, and J. Lu
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Oscillation, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Charge (physics), Jet (particle physics), Nuclear physics, High Energy Physics::Experiment, Production (computer science), Engineering (miscellaneous), Lepton
Abstract: A sample of ${\rm Z}^0$ decays containing b-flavoured hadrons is tagged using leptons, and events having precise proper time measurements are selected. These events are used to study ${\rm B}^0_{\rm s}$ oscillations. The flavour (b or $\rm \bar{b}$) at decay is determined from the lepton charge while the flavour at production is determined from jet charge or the charge of a second lepton, where available. The experiment was not able to resolve the oscillatory behaviour, and we deduce that the ${\rm B}^0_{\rm s}$ oscillation frequency $\Delta m_{\rm s} > 5.2$ ps$^{-1}$ at the 95% confidence level.
Published: 1999
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4. Intermittency and correlations in hadronic Z $^0$ decays

Author: K. Stephens, M. Schumacher, P. G. Estabrooks, F. Odorici, N. K. Watson, D. R. Rust, C. Littlewood, H. A. Neal, Otmar Biebel, P. Scharff-Hansen, P. M. Watkins, K. Hoffman, V. Gibson, Claire Shepherd-Themistocleous, A. M. Lee, J. Goldberg, Erez Etzion, Shlomit Tarem, B. Surrow, G. G. Hanson, Richard Teuscher, A. S. Turcot, N. Altekamp, H. Voss, A. Macpherson, H. O. Ogren, Christoph Geich-Gimbel, I. Trigger, F. Fiedler, Richard Keeler, D. R. Ward, A. M. Smith, P. I. Kayal, K. Stoll, G. Giacomelli, S. Yamashita, I. Lawson, R. J. Barlow, D. J. Miller, I. Cohen, Christoph Rembser, H. Mes, I. P. Duerdoth, S. Braibant, D. Axen, A. Jawahery, T. J. McMahon, A. De Roeck, M. Kobel, P. Igo-Kemenes, M. Hoch, K. Ishii, H. Jeremie, Dave Charlton, C. Couyoumtzelis, M. Fanti, S. A. Robins, M. S. Dixit, O. C. Cooke, S. Spagnolo, Andris Skuja, S. Petzold, Tetsuro Mashimo, A. A. Faust, Peter Sherwood, Alexander Wagner, R. Liebisch, K. Ackerstaff, Norbert Wermes, Sherry Towers, T. Kawamoto, Frans Meijers, J. Dubbert, P. Pfeifenschneider, M. F. Turner-Watson, I. J. Bloodworth, Vakhtang Kartvelishvili, P. Hüntemeyer, R. K. Carnegie, A. J. Martin, R. Kowalewski, J. E. Conboy, A. Fürtjes, R. Howard, P. E.L. Clarke, J. Ludwig, K. Runge, R. Mir, P. Bock, M. Kolrep, J. Patt, R. Hawkings, Satoshi Mihara, Paul Kyberd, S. Orito, S. Arcelli, M. Herndon, F. K. Loebinger, S. Baumann, J. A. Wilson, J. Böhme, Michael Hildreth, Alain Bellerive, André Schöning, Robert McPherson, J. P. Martin, O. Sahr, H. Landsman, P. Gagnon, J. Steuerer, Ivor Fleck, O. Schaile, S. Robertson, R. D. Heuer, E. A. Mckigney, Gideon Alexander, N. L. Rodning, W. Gorn, W. Mader, Paolo Capiluppi, Joleen Pater, P. Dervan, B. Poli, Peter R Hobson, S. De Jong, A. Klier, F. G. Oakham, A. Sittler, D. Zer-Zion, D. C. Imrie, C. K. Hargrove, S. Betts, Yoram Rozen, S. B. Anderson, Matthias Schröder, W. R. Gibson, Gregor Herten, R. L. Coxe, Georges Azuelos, K. Harder, Fabrizio Fabbri, A. Frey, H. Rick, E. L. Barberio, D. Lazic, A. Macchiolo, Zoltan Laszlo Trocsanyi, Dong Hee Kim, M. Hapke, A. Hocker, M. Thiergen, Gideon Bella, H. J. Burckhart, Jacqueline Batley, D. Chrisman, G. D. Long, E. Tsur, D. I. Futyan, Volker Blobel, R. J. Hemingway, T. Kuhl, J. Lauber, R. Van Kooten, S. M. Gascon-Shotkin, Paolo Giacomelli, Sven Menke, Christopher Hawkes, G. Yekutieli, M. Verzocchi, K. W. Bell, J. Pálinkás, J. Grunhaus, G. P. Siroli, M. Przybycień, Junichi Kanzaki, J. Polok, M. Boutemeur, F. S. Merritt, B. W. Kennedy, W. M. Sang, P. Jovanovic, Richard Nisius, D. Karlen, M. Hansroul, S. D. Talbot, Stan Bentvelsen, Christoph Schwick, T. Kress, M. J. Oreglia, J. E. Pilcher, Stephen Lloyd, Austin Ball, J. C. Hill, T. R. Junk, K. Graham, A. A. Carter, Ron Folman, P. S. Wells, B. List, Peter Krieger, Marco Cuffiani, Tara Shears, R. M. Brown, Ehud Duchovni, Lorne Levinson, Alessandro Montanari, W. J. McDonald, M. Jimack, B. C. Shen, A. M. Rossi, A. Biguzzi, J. G. Layter, F. Wäckerle, Terry Richard Wyatt, D. M. Gingrich, Randall Sobie, G. D. Lafferty, Giovanni Abbiendi, A. Michelini, J. R. Carter, C. R. Jones, Siegfried Bethke, D. Liu, A. K. Honma, W. G. Scott, T. Kobayashi, Juergen Thomas, J. Bechtluft, J. A. McKenna, Stefan Schmitt, G. N. Patrick, Daniele Bonacorsi, I. Nakamura, S. Rosati, R. J. Homer, C. Sbarra, F. R. Jacob, Sachio Komamiya, A. T. Watson, A. Harel, Ikuo Ueda, D. M. Strom, J. von Krogh, Guenter Duckeck, D. Glenzinski, J. Lu, Dezso Horvath, M. J. Losty, John Allison, T. P. Kokott, T. Saeki, Claudia Ciocca, K. Roscoe, Jean-Arcady Meyer, Klaus Kurt Desch, M. Gruwé, Shoji Asai, Alessandra Fanfani, R. Davis, E. Torrence, E. Clay, Achim Stahl, R. G. Kellogg, Daniel Lellouch, T. Behnke, Stefano Marcellini, A. W. Lloyd, Kiyotomo Kawagoe, G. W. Wilson, Takehiko Mori, D. E. Plane, P. Mättig, M. Hauschild, C. Markopoulos, G. M. Dallavalle, K. R. Hossain, James Pinfold, R. Perez-Ochoa, R. Seuster, J. Gascon, V. Zacek, M. A. Thomson, J. W. Gary, L. Brigliadori, Ekg Sarkisyan, E. K. U. Gross, Marcello Mannelli, M. Sproston, S. W. O'Neale, K. J. Anderson, Raimund Ströhmer, J. Letts, P. Poffenberger, German Martinez, Beatrix Dienes, J. M. Roney, C. Y. Chang, P. Taras, D. Lanske, Koichi Nagai, J. Schieck, W. Mohr, M. Fierro, S. R. Lautenschlager, K. Sachs, O. Runolfsson, Shlomo Dado, Claudio Grandi, J. S. White, Giora Mikenberg, S. F. Ashby, A. D. Schaile, Gabriella Pasztor, P. Vannerem, G. A. Snow, C. P. Ward, S. Söldner-Rembold, G. Gaycken, and P. G. Bright-Thomas
Subjects: Physics, Quantum chromodynamics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Hadron, Monte Carlo method, Fizikai tudományok, Multiplicity (mathematics), Bose–Einstein correlations, law.invention, Nuclear physics, Természettudományok, law, Intermittency, High Energy Physics::Experiment, Engineering (miscellaneous), Cumulant, Particle Physics - Experiment
Abstract: A multidimensional study of local multiplicity fluctuations and multiparticle correlations of hadrons produced in Z decays is performed. The study is based on the data sample of more than 4 million events recorded with the OPAL detector at LEP. The fluctuations and correlations are analysed in terms of the normalized scaled factorial moments and cumulants up to the fifth order. The moments are observed to have intermittency-like behaviour, which is found to be more pronounced with increasing dimension. The large data sample allows for the first time a study of the factorial cumulants in e+e- annihilation. The analysis of the cumulants shows the existence of genuine multiparticle correlations with a strong intermittency rise up to higher orders. These correlations are found to be stronger in higher dimensions. The decomposition of the factorial moments into lower-order correlations that the dynamical fluctuations have important contributions from genuine many-particle correlations. The Monte Carlo models JETSET 7.4 and HERWIG 5.9 are found to reproduce the trend of the measured moments and cumulants but they underestimate the magnitudes. The results are found to be consistent with QCD jet formation dynamics, although additional contributions from other mechanisms in the hadronization process cannot be excluded. A multidimensional study of local multiplicity fluctuations and multiparticle correlations of hadrons produced in Z decays is performed. The study is based on the data sample of more than 4 million events recorded with the OPAL detector at LEP. The fluctuations and correlations are analysed in terms of the normalized scaled factorial moments and cumulants up to the fifth order. The moments are observed to have intermittency-like behaviour, which is found to be more pronounced with increasing dimension. The large data sample allows for the first time a study of the factorial cumulants in e+e- annihilation. The analysis of the cumulants shows the existence of genuine multiparticle correlations with a strong intermittency rise up to higher orders. These correlations are found to be stronger in higher dimensions. The decomposition of the factorial moments into lower-order correlations shows that the dynamical fluctuations have important contributions from genuine many-particle correlations. The Monte Carlo models JETSET 7.4 and HERWIG 5.9 are found to reproduce the trend of the measured moments and cumulants but they underestimate the magnitudes. The results are found to be consistent with QCD jet formation dynamics, although additional contributions from other mechanisms in the hadronization process cannot be excluded.
Published: 1999
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5. Search for anomalous photonic events with missing energy in ${\rm e}^+{\rm e}^-$ collisions at $\sqrt{s}$ = 130, 136 and 183 GeV

Author: Sachio Komamiya, A. T. Watson, M. Boutemeur, F. S. Merritt, F. Scharf, T. P. Kokott, J. Letts, T. Saeki, Satoshi Mihara, German Martinez, J. Bechtluft, J. A. McKenna, G. G. Hanson, P. Scharff-Hansen, R. Davis, Randall Sobie, G. D. Lafferty, K. Sachs, S. Betts, M. Hapke, M. Fanti, G. Giacomelli, M. J. Oreglia, I. Lawson, Shlomo Dado, J. R. Carter, G. N. Patrick, A. M. Smith, Dave Charlton, R. Bartoldus, A. De Roeck, W. R. Gibson, H. O. Ogren, Christoph Geich-Gimbel, N. Altekamp, H. Voss, Guenter Duckeck, J. M. Roney, Robert McPherson, J. Grunhaus, S. R. Lautenschlager, K. Stoll, Andris Skuja, D. M. Strom, Gregor Herten, K. Harder, R. J. Barlow, G. Gaycken, P. G. Bright-Thomas, R. D. Heuer, D. J. Miller, Fabrizio Fabbri, D. C. Imrie, Claire Shepherd-Themistocleous, M. Schumacher, S. Petzold, R. Bürgin, O. Runolfsson, R. M. Brown, Lorne Levinson, M. S. Dixit, Frans Meijers, Giora Mikenberg, S. F. Ashby, Koichi Nagai, J. Schieck, Tetsuro Mashimo, Achim Stahl, Vakhtang Kartvelishvili, Paul Kyberd, J. E. Conboy, A. Fürtjes, C. Y. Chang, Ehud Duchovni, W. Mohr, M. Jimack, G. P. Siroli, J. E. Pilcher, F. Odorici, R. Van Kooten, T. R. Junk, A. Biguzzi, A. A. Faust, W. Gorn, P. Taras, F. K. Loebinger, P. S. Wells, Claudio Grandi, J. S. White, Christoph Schwick, A. Michelini, J. Steuerer, J. G. Layter, A. W. Lloyd, Ekg Sarkisyan, R. J. Hemingway, C. Hartmann, S. B. Anderson, D. E. Plane, Terry Richard Wyatt, Gideon Bella, K. Stephens, Stephen Hillier, H. A. Neal, G. M. Dallavalle, Ivor Fleck, G. W. Wilson, Satoshi Tanaka, Joleen Pater, A. D. Schaile, Gabriella Pasztor, M. Hauschild, C. Markopoulos, P. Vannerem, M. A. Thomson, A. Macpherson, H. J. Burckhart, Jacqueline Batley, F. Wäckerle, C. Littlewood, B. W. Kennedy, James Pinfold, R. Perez-Ochoa, R. Seuster, P. Jovanovic, A. Klier, Austin Ball, D. M. Gingrich, T. Kobayashi, E. K. U. Gross, L. Brigliadori, V. Gibson, H. Mes, S. M. Gascon-Shotkin, Peter Krieger, J. Gascon, R. Howard, Stan Bentvelsen, M. Sproston, K. Roscoe, G. A. Snow, C. P. Ward, Alessandro Montanari, D. Lanske, M. F. Turner-Watson, I. Trigger, I. P. Duerdoth, S. Braibant, A. Macchiolo, Peter R Hobson, D. R. Rust, P. E.L. Clarke, Klaus Kurt Desch, E. Torrence, M. Kobel, S. Söldner-Rembold, D. R. Ward, T. Kress, C. M. Hawkes, R. Mir, J. P. Martin, E. Clay, Otmar Biebel, R. Kowalewski, V. Zacek, R. Hawkings, S. W. O'Neale, K. J. Anderson, D. Zer-Zion, O. C. Cooke, P. Hüntemeyer, S. Arcelli, A. M. Lee, P. I. Kayal, Georges Azuelos, P. Pfeifenschneider, T. Kuhl, John Allison, J. W. Gary, Raimund Ströhmer, Norbert Wermes, E. von Törne, Sherry Towers, T. Kawamoto, S. De Jong, E. Tsur, D. S. Koetke, Marcello Mannelli, Richard Teuscher, A. S. Turcot, C. R. Jones, S. Orito, J. Patt, Richard Nisius, A. M. Rossi, André Schöning, P. Poffenberger, M. Fierro, M. Verzocchi, K. W. Bell, H. Rick, O. Sahr, F. G. Oakham, B. List, Marco Cuffiani, F. Fiedler, J. Pálinkás, Kiyotomo Kawagoe, B. Schmitt, E. L. Barberio, Gideon Alexander, Paolo Giacomelli, M. Hansroul, Paolo Capiluppi, J. C. Hill, Beatrix Dienes, C. Burgard, R. J. Homer, R. G. Kellogg, R. L. Coxe, W. J. McDonald, B. C. Shen, A. Hocker, M. Kolrep, Siegfried Bethke, D. Liu, A. K. Honma, D. Chrisman, G. D. Long, K. R. Hossain, Stefano Marcellini, Volker Blobel, W. G. Scott, I. Nakamura, Stephen Lloyd, W. M. Sang, Claudia Ciocca, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Michael Hildreth, Alain Bellerive, N. L. Rodning, C. Sbarra, F. R. Jacob, Daniele Bonacorsi, J. Lauber, J. von Krogh, S. D. Talbot, M. Gruwé, L. A. del Pozo, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, D. Eatough, T. Behnke, M. Bobinski, J. A. Wilson, J. Böhme, D. Lazic, P. Gagnon, G. Yekutieli, M. Przybycień, A. A. Carter, Ron Folman, A. Sittler, Zoltan Laszlo Trocsanyi, Giovanni Abbiendi, S. D. Bird, D. Axen, A. Jawahery, Peter Sherwood, Stefan Schmitt, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Shoji Asai, P. G. Estabrooks, R. K. Keeler, Daniel Lellouch, N. K. Watson, Takehiko Mori, P. Mättig, P. M. Watkins, I. J. Bloodworth, S. Baumann, Yoram Rozen, E. A. Mckigney, J. Polok, D. Karlen, D. I. Futyan, J. Goldberg, B. Nellen, H. G. Evans, I. Cohen, Christoph Rembser, Erez Etzion, Stefan Kluth, Shlomit Tarem, B. Surrow, S. A. Robins, R. Liebisch, K. Ackerstaff, A. J. Martin, S. Yamashita, P. Igo-Kemenes, K. Ishii, H. Jeremie, W. Mader, O. Schaile, C. K. Hargrove, S. Robertson, Matthias Schröder, Sven Menke, M. Thiergen, and Tara Shears
Subjects: Physics, Particle physics, Missing energy, Physics and Astronomy (miscellaneous), Physics beyond the Standard Model, Standard Model, Nuclear physics, Pair production, Neutralino, High Energy Physics::Experiment, Gravitino, Production (computer science), Engineering (miscellaneous), Energy (signal processing)
Abstract: Photonic events with large missing energy have been observed in $\mathrm e^+e^-$ collisions at centre-of-mass energies of 130, 136 and 183 GeV collected in 1997 using the OPAL detector at LEP. Results are presented for event topologies with a single photon and missing transverse energy or with an acoplanar photon pair. Cross-section measurements are performed within the kinematic acceptance of each selection. These results are compared with the expectations from the Standard Model process ${\rm e}^+{\rm e}^-\to\nu\overline{\nu}$ + photon(s). No evidence is observed for new physics contributions to these final states. Using the data at $\sqrt{s}$ = 183 GeV, upper limits on ${\sigma({\rm e^+e^-}\to{\rm XY})\cdot{\rm BR}(\rm X \to Y \gamma)}$ and ${\sigma({\rm e^+e^-}\to{\rm XX})\cdot{\rm BR}^2(\rm X \to Y \gamma)}$ are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos ( $\rm X = \nu^*, Y = \nu$ ), to neutralino production ( $\rm X={{\tilde{\chi}}^{0}}_{2}, Y={{\tilde{\chi}}^{0}}_{1}$ ) and to supersymmetric models in which $\rm X = {{\tilde{\chi}}^{0}}_{1}$ and $\rm Y=\tilde{\mathrm{G}}$ is a light gravitino.
Published: 1999
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6. Measurements of flavour-dependent fragmentation functions in ${\bf Z^{0} \rightarrow{\rm q}\bar{\rm q}}$ events

Author: J. von Krogh, R. Bartoldus, G. Yekutieli, M. Przybycień, A. A. Carter, Ron Folman, J. Letts, M. Gruwé, L. A. del Pozo, P. G. Bright-Thomas, K. Stephens, M. Fanti, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, Daniel Lellouch, M. Bobinski, C. Y. Chang, J. A. Wilson, J. Böhme, H. O. Ogren, K. Roscoe, M. Schumacher, E. Lefebvre, D. Lazic, Takehiko Mori, P. Mättig, F. Odorici, Randall Sobie, T. Schorner, S. D. Bird, John Allison, Reda Tafirout, Klaus Kurt Desch, G. D. Lafferty, Christoph Geich-Gimbel, S. M. Gascon-Shotkin, Achim Stahl, James Pinfold, R. Perez-Ochoa, R. Seuster, C. Littlewood, V. Gibson, E. Torrence, F. Scharf, K. Sachs, Shlomo Dado, Georges Azuelos, E. Tsur, German Martinez, J. Gascon, T. R. Junk, D. Axen, P. E.L. Clarke, A. Jawahery, Robert McPherson, M. Verzocchi, H. A. Neal, I. Trigger, E. Clay, K. W. Bell, R. G. Kellogg, J. Pálinkás, D. R. Ward, T. Kress, J. C. Hill, J. P. Martin, Dave Charlton, P. G. Estabrooks, Vakhtang Kartvelishvili, Mathieu Doucet, V. Zacek, T. Behnke, W. J. McDonald, Peter Sherwood, R. K. Keeler, B. C. Shen, Stefano Marcellini, M. F. Turner-Watson, J. W. Gary, R. D. Heuer, D. S. Koetke, W. R. Gibson, Stefan Schmitt, Siegfried Bethke, J. E. Conboy, R. Kowalewski, S. De Jong, Marcello Mannelli, Fabrizio Fabbri, M. A. Thomson, A. K. Honma, W. G. Scott, Guenter Duckeck, A. Fürtjes, N. K. Watson, W. M. Sang, Kiyotomo Kawagoe, Peter R Hobson, R. Bürgin, Alexander Wagner, I. Nakamura, E. K. U. Gross, H. Mes, P. Scharff-Hansen, A. M. Rossi, K. Nagai, I. P. Duerdoth, S. Braibant, J. Ludwig, D. Zer-Zion, K. Runge, P. Bock, P. M. Watkins, M. Sproston, A. Macchiolo, O. C. Cooke, Gregor Herten, P. Pfeifenschneider, H. Rick, Shoji Asai, Giora Mikenberg, A. Joly, R. M. Brown, Lorne Levinson, A. M. Smith, S. F. Ashby, K. R. Hossain, D. R. Rust, C. M. Hawkes, D. Glenzinski, J. Patt, André Schöning, K. Stoll, Andris Skuja, M. Boutemeur, F. S. Merritt, I. J. Bloodworth, P. Hüntemeyer, S. B. Anderson, P. Gagnon, S. Petzold, C. Sbarra, Satoshi Mihara, Gideon Alexander, Dezso Horvath, M. J. Losty, F. R. Jacob, Jean-Arcady Meyer, Tetsuro Mashimo, O. Sahr, Paolo Capiluppi, J. Grunhaus, C. Hartmann, D. E. Plane, A. M. Lee, Gideon Bella, A. D. Schaile, W. Gorn, Paul Kyberd, F. K. Loebinger, A. Sittler, Stephen Hillier, E. von Törne, Gabriella Pasztor, J. M. Roney, R. L. Coxe, Zoltan Laszlo Trocsanyi, Richard Nisius, Stan Bentvelsen, M. Fierro, G. M. Dallavalle, Yoram Rozen, H. J. Burckhart, Jacqueline Batley, P. Vannerem, Michael Hildreth, J. Steuerer, Ivor Fleck, Silvia Arcelli, J. Bechtluft, B. List, J. A. McKenna, D. Lui, A. Hocker, Paolo Giacomelli, Joleen Pater, Marco Cuffiani, Richard Teuscher, G. A. Snow, A. Klier, A. S. Turcot, F. Fiedler, D. Chrisman, G. D. Long, M. Hansroul, Ekg Sarkisyan, C. P. Ward, Sachio Komamiya, N. L. Rodning, R. Van Kooten, Theodoros Geralis, J. Lauber, J. Schieck, Volker Blobel, A. T. Watson, W. Mohr, G. G. Hanson, C. Burgard, S. Söldner-Rembold, B. Poli, R. J. Homer, T. P. Kokott, Stephen Lloyd, T. Saeki, G. Giacomelli, I. Lawson, F. Wäckerle, S. D. Talbot, J. E. Pilcher, D. M. Gingrich, Alessandra Fanfani, R. Davis, Claire Shepherd-Themistocleous, Ehud Duchovni, S. Baumann, J. Polok, A. De Roeck, M. Kobel, D. Karlen, M. Kolrep, D. Eatough, M. Jimack, C. R. Jones, G. W. Wilson, A. Michelini, H. M. Fischer, E. A. Mckigney, M. S. Dixit, D. C. Imrie, P. Vikas, A. A. Faust, Frans Meijers, Satoshi Tanaka, T. Kobayashi, D. Lanske, S. Betts, M. Hapke, G. P. Siroli, S. R. Lautenschlager, A. Biguzzi, J. G. Layter, Christoph Schwick, Claudia Ciocca, O. Runolfsson, D. I. Futyan, Claudio Grandi, M. J. Oreglia, A. W. Lloyd, S. Yamashita, P. Igo-Kemenes, S. A. Robins, K. Ishii, H. Jeremie, M. Hauschild, C. Markopoulos, R. Liebisch, K. Ackerstaff, J. R. Carter, G. N. Patrick, O. Schaile, Otmar Biebel, S. Robertson, P. Taras, Raimund Ströhmer, P. Poffenberger, Beatrix Dienes, Sven Menke, S. W. O'Neale, K. J. Anderson, P. I. Kayal, Erez Etzion, Stefan Kluth, Shlomit Tarem, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, J. Goldberg, B. Nellen, H. G. Evans, I. Cohen, Christoph Rembser, P. S. Wells, Terry Richard Wyatt, A. Macpherson, A. J. Martin, C. K. Hargrove, Tara Shears, R. Howard, R. Mir, R. Hawkings, J. S. White, Matthias Schröder, M. Thiergen, D. M. Strom, F. G. Oakham, B. Schmitt, E. L. Barberio, N. Altekamp, H. Voss, R. J. Barlow, D. J. Miller, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, and Alessandro Montanari
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Flavour, 01 natural sciences, Bottom quark, Charged particle, Nuclear physics, 0103 physical sciences, High Energy Physics::Experiment, Charm (quantum number), 010306 general physics, Maxima, Engineering (miscellaneous)
Abstract: Fragmentation functions for charged particles in ${\rm Z}^0 \rightarrow {\rm q}\bar{\rm q}$ events have been measured for bottom (b), charm (c) and light (uds) quarks as well as for all flavours together. The results are based on data recorded between 1990 and 1995 using the OPAL detector at LEP. Event samples with different flavour compositions were formed using reconstructed ${\rm D}^{*\pm}$ mesons and secondary vertices. The $\xi_{\rm p} =\ln(1/x_{\rm p})$ distributions and the position of their maxima $\xi_0$ are also presented separately for uds, c and b quark events. The fragmentation function for b quarks is significantly softer than for uds quarks.
Published: 1999
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7. A measurement of the τ→ν branching ratio

Author: S. M. Gascon-Shotkin, P. Poffenberger, A. D. Schaile, Gabriella Pasztor, John Allison, G. Gaycken, P. G. Bright-Thomas, J. Lauber, Erez Etzion, G. Yekutieli, A. J. Martin, M. Przybycień, Stefan Kluth, Shlomit Tarem, Beatrix Dienes, M. Schumacher, P. Gagnon, P. Vannerem, S. D. Talbot, A. Sittler, Zoltan Laszlo Trocsanyi, Dong Hee Kim, T. Kress, Daniel Lellouch, R. G. Kellogg, A. M. Rossi, A. A. Carter, Ron Folman, D. Eatough, Takehiko Mori, F. Odorici, B. Surrow, G. A. Snow, C. P. Ward, T. Behnke, W. Mader, Stefano Marcellini, S. D. Bird, P. Mättig, C. K. Hargrove, S. Söldner-Rembold, H. A. Neal, D. Axen, A. Jawahery, M. Fanti, C. Y. Chang, S. A. Robins, P. G. Estabrooks, R. K. Keeler, D. C. Imrie, Dave Charlton, Claire Shepherd-Themistocleous, Peter Sherwood, Alexander Wagner, Giovanni Abbiendi, J. Ludwig, K. Runge, P. Bock, N. K. Watson, Matthias Schröder, P. Taras, Paul Kyberd, F. K. Loebinger, K. Hoffman, R. Liebisch, K. Ackerstaff, J. Steuerer, T. R. Junk, G. P. Siroli, E. Tsur, Ivor Fleck, M. Thiergen, S. R. Lautenschlager, Stefan Schmitt, P. S. Wells, P. M. Watkins, T. J. McMahon, M. Verzocchi, K. W. Bell, Joleen Pater, C. Couyoumtzelis, A. Klier, Christoph Schwick, R. J. Hemingway, J. Pálinkás, S. B. Anderson, M. Boutemeur, F. S. Merritt, A. A. Faust, R. D. Heuer, J. Dubbert, R. K. Carnegie, K. Sachs, M. Herndon, James Pinfold, R. Perez-Ochoa, R. Seuster, Terry Richard Wyatt, J. C. Hill, Robert McPherson, Christopher Hawkes, J. A. Wilson, J. Böhme, Shoji Asai, W. M. Sang, Shlomo Dado, L. Brigliadori, O. Runolfsson, Claudia Ciocca, B. W. Kennedy, P. Jovanovic, Gideon Bella, I. J. Bloodworth, Gregor Herten, W. J. McDonald, B. C. Shen, J. Gascon, S. Baumann, D. Lazic, K. Graham, H. J. Burckhart, Jacqueline Batley, A. Macpherson, Tara Shears, Daniele Bonacorsi, Fabrizio Fabbri, Giora Mikenberg, J. Goldberg, Siegfried Bethke, D. Liu, A. K. Honma, E. A. Mckigney, Austin Ball, Yoram Rozen, J. Bechtluft, J. A. McKenna, Peter Krieger, V. Zacek, Claudio Grandi, W. G. Scott, Michael Hildreth, B. Nellen, Stan Bentvelsen, C. Sbarra, G. Azuelos, F. R. Jacob, S. F. Ashby, I. Nakamura, J. S. White, Ekg Sarkisyan, R. Van Kooten, Kiyotomo Kawagoe, J. E. Pilcher, J. W. Gary, N. L. Rodning, D. S. Koetke, A. Macchiolo, J. von Krogh, S. W. O'Neale, J. Letts, Marcello Mannelli, R. Bartoldus, P. Dervan, J. Polok, D. Karlen, Alessandro Montanari, D. Glenzinski, H. Mes, I. P. Duerdoth, A. W. Lloyd, H. O. Ogren, K. J. Anderson, C. R. Jones, K. Stoll, Andris Skuja, S. Petzold, Dezso Horvath, M. J. Losty, M. Gruwé, D. I. Futyan, Christoph Geich-Gimbel, R. Howard, Jean-Arcady Meyer, G. W. Wilson, Tetsuro Mashimo, T. Kuhl, Richard Nisius, M. F. Turner-Watson, M. Hauschild, C. Markopoulos, F. Wäckerle, S. Braibant, A. Bellerive, B. List, Vakhtang Kartvelishvili, R. Mir, D. M. Gingrich, Randall Sobie, G. D. Lafferty, Marco Cuffiani, J. E. Conboy, A. Fürtjes, K. R. Hossain, W. Gorn, I. Cohen, R. Hawkings, Christoph Rembser, D. Lanske, A. Harel, P. Hüntemeyer, Ikuo Ueda, D. M. Strom, P. Scharff-Hansen, H. Landsman, D. R. Rust, A. M. Smith, Guenter Duckeck, M. Fierro, A. M. Lee, Richard Teuscher, A. S. Turcot, E. von Törne, F. Fiedler, M. Kolrep, F. G. Oakham, B. Schmitt, E. L. Barberio, N. Altekamp, H. Voss, R. J. Barlow, D. J. Miller, S. Spagnolo, S. Yamashita, P. Igo-Kemenes, M. Hoch, K. Ishii, H. Jeremie, O. Schaile, S. Robertson, Sven Menke, Ehud Duchovni, M. Jimack, A. Michelini, Satoshi Tanaka, T. Kobayashi, Peter R Hobson, J. M. Roney, R. L. Coxe, D. Zer-Zion, Sachio Komamiya, A. T. Watson, A. Hocker, Koichi Nagai, J. Schieck, D. Chrisman, G. D. Long, T. P. Kokott, W. Mohr, Volker Blobel, Achim Stahl, T. Saeki, R. Davis, Stephen Lloyd, J. Grunhaus, R. Kowalewski, S. Arcelli, F. Scharf, German Martinez, Juergen Thomas, A. Biguzzi, J. G. Layter, Gideon Alexander, M. A. Thomson, Paolo Capiluppi, P. E.L. Clarke, J. P. Martin, E. K. U. Gross, S. De Jong, H. Rick, M. Sproston, G. G. Hanson, G. Giacomelli, I. Lawson, K. Stephens, A. De Roeck, M. Kobel, C. Littlewood, M. S. Dixit, Frans Meijers, O. C. Cooke, P. Pfeifenschneider, V. Gibson, I. Trigger, D. R. Ward, J. Patt, André Schöning, O. Sahr, Satoshi Mihara, Otmar Biebel, Paolo Giacomelli, M. Hansroul, R. J. Homer, P. I. Kayal, Norbert Wermes, Sherry Towers, T. Kawamoto, W. R. Gibson, S. Orito, K. Harder, S. Betts, M. Hapke, M. J. Oreglia, J. R. Carter, G. N. Patrick, R. M. Brown, Lorne Levinson, C. Hartmann, D. E. Plane, G. M. Dallavalle, K. Roscoe, Klaus Kurt Desch, E. Torrence, E. Clay, and Raimund Ströhmer
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Electron energy spectrum, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, 0103 physical sciences, Strong coupling, Analytical chemistry, Mass scale, 010306 general physics, 01 natural sciences
Abstract: The branching ratio for the decay τ − → e − ν e ν τ has been measured using Z 0 decay data collected by the OPAL experiment at LEP. In total 33 073 τ − → e − ν e ν τ candidates were identified from a sample of 186 197 selected τ decays, giving a branching ratio of B (τ − → e − ν e ν τ )=(17.81±0.09 (stat) ±0.06 (syst) )% . This result is combined with other measurements to test e - μ and μ - τ universality in charged-current weak interactions. Additionally, the strong coupling constant α s ( m τ 2 ) has been extracted from B (τ − → e − ν e ν τ ) and evolved to the Z 0 mass scale, giving α s ( m Z 2 )=0.1204±0.0011 (exp)±0.0019 (theory).
Published: 1999
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8. Investigation of CP violation in $\mathrm{B^0} \rightarrow \mathrm{J}/\psi \mathrm{K^0_S}$ decays at LEP

Author: G. W. Wilson, Richard Teuscher, A. S. Turcot, M. Hauschild, C. Markopoulos, F. Fiedler, A. Biguzzi, A. Rooke, R. Bartoldus, A. Macpherson, C. Markus, I. J. Bloodworth, J. G. Layter, H. O. Ogren, R. Kowalewski, Christoph Geich-Gimbel, Yoram Rozen, M. Foucher, R. Davis, E. H. Vokurka, M. Kolrep, K. Stephens, H. M. Fischer, R. Howard, J. S. White, Gideon Alexander, Junichi Kanzaki, D. Karlen, M. Schumacher, E. Lefebvre, Paolo Capiluppi, P. G. Estabrooks, R. K. Keeler, A. Michelini, Vakhtang Kartvelishvili, P. Gagnon, F. Odorici, M. Fierro, V. Gibson, Randall Sobie, N. K. Watson, P. M. Watkins, Daniel Lellouch, J. E. Conboy, A. Fürtjes, J. Letts, S. R. Lautenschlager, G. D. Lafferty, Stefan Schmitt, L. Brigliadori, Shoji Asai, Takehiko Mori, R. W. Springer, P. Mättig, V. Zacek, A. Sittler, T. R. Junk, H. A. Neal, Lutz Feld, G. G. Hanson, Peter Schleper, I. Trigger, O. Runolfsson, K. Sachs, Zoltan Laszlo Trocsanyi, R. L. Coxe, D. R. Ward, T. Kress, John Allison, Shlomo Dado, N. J. Oldershaw, C. Dallapiccola, J. Goldberg, Silvia Arcelli, G. Giacomelli, I. Lawson, U. Ruppel, A. Hocker, D. Chrisman, G. D. Long, Volker Blobel, M. Boutemeur, F. S. Merritt, Matthias Schröder, B. Nellen, S. Yamashita, P. Igo-Kemenes, Guenter Duckeck, A. De Roeck, K. Ishii, H. Jeremie, P. Scharff-Hansen, Claudio Grandi, P. S. Wells, M. F. Turner-Watson, Peter R Hobson, S. W. O'Neale, M. S. Dixit, Frans Meijers, Georges Azuelos, E. Tsur, Stephen Lloyd, M. Thiergen, Giora Mikenberg, Terry Richard Wyatt, S. F. Ashby, K. J. Anderson, M. Verzocchi, K. W. Bell, Ekg Sarkisyan, S. D. Bird, J. Pálinkás, S. B. Anderson, S. M. Gascon-Shotkin, P. Szymanski, R. G. Kellogg, D. Zer-Zion, S. Baumann, E. A. Mckigney, Raimund Ströhmer, P. Routenburg, P. W. Jeffreys, J. Bechtluft, J. A. McKenna, Ehud Duchovni, J. C. Hill, O. Schaile, M. Jimack, P. E.L. Clarke, M. K. Jones, J. P. Martin, W. P. Lai, H. G. Evans, A. M. Smith, Csaba Hajdu, M. J. Goodrick, I. Cohen, S. Robertson, P. Poffenberger, J. M. Roney, S. De Jong, D. I. Futyan, W. J. McDonald, Stefano Marcellini, Gregor Herten, B. C. Shen, A. D. Schaile, Gabriella Pasztor, P. Vannerem, D. Lui, Anna Macchiolo, Stan Bentvelsen, Christoph Rembser, Satoshi Mihara, J. Grunhaus, D. Axen, Ikuo Ueda, D. M. Strom, Sven Menke, A. Jawahery, N. Altekamp, H. Voss, P. Vikas, T. Kobayashi, Siegfried Bethke, A. K. Honma, K. Stoll, Matthew Evans, A. M. Rossi, G. A. Snow, C. P. Ward, D. Lanske, W. M. Sang, W. G. Scott, J. E. Pilcher, I. Nakamura, S. Söldner-Rembold, A. J. Martin, Andris Skuja, Beatrix Dienes, R. J. Barlow, S. Petzold, Sachio Komamiya, R VanKooten, Theodoros Geralis, Peter Sherwood, Erez Etzion, C. Y. Chang, C. K. Hargrove, D. Glenzinski, A. T. Watson, Tara Shears, Tetsuro Mashimo, P. Taras, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, P. A. Hart, Michael Kobel, D. J. Miller, T. P. Kokott, A. Joly, Stefan Kluth, Shlomit Tarem, Allen Mincer, Marcello Fanti, T. Saeki, Alexander Wagner, J. Ludwig, Julie Kirk, K. Runge, P. Bock, Alessandra Fanfani, N. I. Geddes, Michael Hildreth, C. Sbarra, J. Lauber, N. L. Rodning, B. Poli, W. Gorn, B. Stockhausen, Paul Kyberd, F. K. Loebinger, U. Jost, S. A. Robins, R. Mir, J. Steuerer, Ivor Fleck, R. Hawkings, Joleen Pater, A. Klier, S. D. Talbot, R. Giacomelli, A. Oh, K. Ackerstaff, D. Eatough, James Pinfold, R. Perez-Ochoa, D. G. Fong, F. G. Oakham, B. Schmitt, J. Gascon, E. L. Barberio, Paolo Giacomelli, M. Hansroul, R. J. Hemingway, B. W. Kennedy, C. Burgard, P. Jovanovic, Austin Ball, Peter Krieger, Alessandro Montanari, R. J. Homer, J. W. Gary, D. S. Koetke, O. C. Cooke, P. Pfeifenschneider, Marcello Mannelli, J. Patt, André Schöning, O. Sahr, M. A. Thomson, H. Mes, I. P. Duerdoth, S. Braibant, P. Hüntemeyer, E. K. U. Gross, M. Sproston, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Reda Tafirout, Klaus Kurt Desch, E. Torrence, W. R. Gibson, T. J. McMahon, C. Couyoumtzelis, R. M. Brown, Lorne Levinson, A. Skillman, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, F. Scharf, T. Behnke, C. M. Hawkes, German Martinez, Richard Nisius, B. List, D. Lazic, Marco Cuffiani, Dave Charlton, Daniele Bonacorsi, Claire Shepherd-Themistocleous, F. Wäckerle, D. M. Gingrich, J. von Krogh, R. Bürgin, A. A. Faust, M. Gruwé, L. A. del Pozo, G. Yekutieli, Robert McPherson, Mathieu Doucet, R. D. Heuer, A. A. Carter, Ron Folman, Fabrizio Fabbri, K. Nagai, P. Utzat, D. R. Rust, Gideon Bella, J. Schieck, A. M. Lee, E. von Törne, H. J. Burckhart, Jacqueline Batley, W. Mohr, A. Posthaus, C. R. Jones, R. Lahmann, D. C. Imrie, G. P. Siroli, Otmar Biebel, Christoph Schwick, P. I. Kayal, Kiyotomo Kawagoe, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, K. R. Hossain, S. Betts, M. Hapke, D. E. Hutchcroft, M. J. Oreglia, J. R. Carter, and G. N. Patrick
Subjects: Physics, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Electron–positron annihilation, Hadron, Detector, CP violation, Engineering (miscellaneous), Asymmetry, media_common, Standard Model
Abstract: An investigation of CP violation was performed using a total of 24 candidates for B0→J/ψK0SB0→J/ψKS0 decay, with a purity of about 60%. These events were selected from 4.4 million hadronic Z0Z0 decays recorded by the OPAL detector at LEP. An analysis procedure, involving techniques to reconstruct the proper decay times and tag the produced b-flavours, B0B0 or B¯0B¯0 , has been developed to allow a first direct study of the time dependent CP asymmetry that, in the Standard Model, is sin2βsin⁡2β . The result is where the first error is statistical and the second systematic. This result is used to determine probabilities for different values of sin2βsin⁡2β in the physical region from −1−1 to +1.
Published: 1998
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9. Determination of the production rate of D*0 mesons and of the ratio V/(V+P) in $$Z^0 \to c\bar c$$ decays

Author: K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K. J. Anderson, S. Anderson, S. Arcelli, S. Asai, S. F. Ashby, D. Axen, G. Azuelos, A. H. Ball, E. Barberio, R. J. Barlow, R. Bartoldus, J. R. Batley, S. Baumann, J. Bechtluft, T. Behnke, K. W. Bell, G. Bella, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, S. D. Bird, V. Blobel, I. J. Bloodworth, M. Bobinski, P. Bock, D. Bonacorsi, M. Boutemeur, S. Braibant, L. Brigliadori, R. M. Brown, H. J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R.Carter, C. Y. Chang, D. G. Charlton, D. Chrisman, P. E. L. Clarke, I. Cohen, J. E. Conboy, O. C. Cooke, C. Couyoumtzelis, R. L. Coxe, M. Cuffiani, S. Dado, C. Dallapiccola, G. M. Dallavalle, R. Davis, S. De Jong, L. A. del Pozo, A. de Roeck, K. Desch, B. Dienes, M. S. Dixit, M. Doucet, E. Duchovni, G. Duckeck, I. P. Duerdoth, D. Eatough, P. G. Estabrooks, E. Etzion, H. G. Evans, M. Evans, F. Fabbri, A. Fanfani, M. Fanti, A. A. Faust, L. Feld, F. Fiedler, M. Fierro, H. M. Fischer, I. Fleck, R. Folman, D. G. Fong, M. Foucher, A. Fürtjes, D. I. Futyan, P. Gagnon, J. W. Gary, J. Gascon, S. M. Gascon-Shotkin, N. I. Geddes, C. Geich-Gimbel, T. Geralis, G. Giacomelli, P. Giacomelli, R. Giacomelli, V. Gibson, W. R. Gibson, D. M. Gingrich, D. Glenzinski, J. Goldberg, M. J. Goodrick, W. Gorn, C. Grandi, E. Gross, J. Grunhaus, M. Gruwé, C. Hajdu, G. G. Hanson, M. Hansroul, M. Hapke, C. K. Hargrove, P. A. Hart, C. Hartmann, M. Hauschild, C. M. Hawkes, R. Hawkings, R. J. Hemingway, M. Herndon, G. Herten, R. D. Heuer, M. D. Hildreth, J. C. Hill, S. J. Hillier, P. R. Hobson, A. Hocker, R. J. Homer, A. K. Honma, D. Horvath, K. R. Hossain, R. Howard, P. Hüntemeyer, D. E. Hutchcroft, P. Igo-Kemenes, D. C. Imrie, K. Ishii, A. Jawahery, P. W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, C. R. Jones, M. Jones, U. Jost, P. Jovanovic, T. R. Junk, J. Kanzaki, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P. I. Kayal, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, J. Kirk, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D. S. Koetke, T. P. Kokott, M. Kolrep, S. Komamiya, R. V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G. D. Lafferty, R. Lahmann, W. P. Lai, D. Lanske, J. Lauber, S. R. Lautenschlager, I. Lawson, J. G. Layter, D. Lazic, A. M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, B. List, S. L. Lloyd, F. K. Loebinger, G. D. Long, M. J. Losty, J. Ludwig, D. Lui, A. Macchiolo, A. Macpherson, M. Mannelli, S. Marcellini, C. Markopoulos, C. Markus, A. J. Martin, J. P. Martin, G. Martinez, T. Mashimo, P. Mättig, W. J. McDonald, J. McKenna, E. A. Mckigney, T. J. McMahon, R. A. McPherson, F. Meijers, S. Menke, F. S. Merritt, H. Mes, J. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D. J. Miller, A. Mincer, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H. A. Neal, B. Nellen, R. Nisius, S. W. O’Neale, F. G. Oakham, F. Odorici, H. O. Ogren, A. Oh, N. J. Oldershaw, M. J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J. R. Pater, G. N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J. E. Pilcher, J. Pinfold, D. E. Plane, P. Poffenberger, B. Poli, A. Posthaus, C. Rembser, S. Robertson, S. A. Robins, N. Rodning, J. M. Roney, A. Rooke, A. M. Rossi, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, U. Ruppel, D. R. Rust, K. Sachs, T. Saeki, O. Sahr, W. M. Sang, E. K. G. Sarkisyan, C. Sbarra, A. D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, P. Schleper, B. Schmitt, S. Schmitt, A. Schöming, M. Schröder, M. Schumacher, C. Schwick, W. G. Scott, T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, G. P. Siroli, A. Sittler, A. Skillman, A. Skuja, A. M. Smith, G. A. Snow, R. Sobie, S. Söldner-Rembold, R. W. Springer, M. Sproston, K. Stephens, J. Steuerer, B. Stockhausen, K. Stoll, D. Strom, R. Ströhmer, P. Szymanski, R. Tafirout, S. D. Talbot, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, M. A. Thomson, E. von Törne, E. Torrence, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A. S. Turcot, M. F. Turner-Watson, I. Ueda, P. Utzat, R. Van Kooten, P. Vannerem, M. Verzocchi, P. Vikas, E. H. Vokurka, H. Voss, F. Wäckerle, A. Wagner, C. P. Ward, D. R. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. S. Wells, N. Wermes, J. S. White, G. W. Wilson, J. A. Wilson, T. R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Systematic error, Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Nuclear physics, Pseudoscalar, Excited state, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Production rate
Abstract: In e+e2212 collisions at centre-of-mass energies around 91 GeV, D*0 mesons have been reconstructed using data collected with the OPAL detector at LEP. The hadronisation fraction has been measured to be f(c→D*0)=0.218±0.054±0.045±0.007, where the errors correspond to the statistical and systematic errors specific to this analysis, and to systematic uncertainties from externally measured branching fractions, respectively. Together with previous OPAL measurements of the hadronisation fractions of other charmed mesons, this value is used to investigate the relative production of observed vector and pseudoscalar charmed mesons in $Z^0 \to c\bar c$ decays. The production ratio is determined to be PeffV = V/(V+P)=0.57±0.05. The relative primary production of vector and pseudoscalar mesons, Pvrim, is studied in the context of the production and decay of orbitally excited charmed resonances. The first measurement of the inclusive Ds*+ production rate in hadronic Z0 decays is presented.
Published: 1998
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10. An upper limit for the $\tau$ –neutrino mass from $\tau\rightarrow 5\pi^{\pm}\nu_{\tau}$ decays

Author: R. Bartoldus, H. M. Fischer, H. O. Ogren, Christoph Geich-Gimbel, P. G. Bright-Thomas, N. Altekamp, H. Voss, Gideon Bella, M. Schumacher, E. Lefebvre, S. B. Anderson, D. J. Miller, Vakhtang Kartvelishvili, S. L. Lloyd, F. Odorici, Otmar Biebel, P. I. Kayal, A. J. Martin, Norbert Wermes, Sherry Towers, T. Kawamoto, J. E. Conboy, A. Fürtjes, S. Orito, H. A. Neal, B. C. Shen, S. W. O'Neale, H. J. Burckhart, Jacqueline Batley, Stan Bentvelsen, J. A. McKenna, Daniel Lellouch, Takehiko Mori, J. Grunhaus, P. Gagnon, J. Allison, Siegfried Bethke, A. K. Honma, W. G. Scott, I. Nakamura, Silvia Arcelli, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, P. Mättig, R. Kowalewski, Austin Ball, Peter Krieger, C. K. Hargrove, Claudia Ciocca, M. Boutemeur, F. S. Merritt, Alessandro Montanari, S. A. Robins, H. Mes, I. P. Duerdoth, A. Sittler, R. Mir, Zoltan Laszlo Trocsanyi, Matthias Schröder, J. W. Gary, K. J. Anderson, R. Hawkings, Raimund Ströhmer, J. R. Carter, P. Igo-Kemenes, T. Schorner, M. Thiergen, S. Braibant, Gideon Alexander, Paolo Capiluppi, S. Baumann, K. Ishii, H. Jeremie, S. Betts, M. Hapke, Stefan Schmitt, J. Bechtluft, R. Liebisch, K. Ackerstaff, E. A. Mckigney, James Pinfold, R. Perez-Ochoa, R. Seuster, M. J. Oreglia, G. Duckeck, C. R. Jones, F. G. Oakham, D. Glenzinski, B. Schmitt, E. L. Barberio, G. N. Patrick, G. Mikenberg, P. Hüntemeyer, J. Gascon, V. Gibson, O. Schaile, Dezso Horvath, M. J. Losty, Ehud Duchovni, R. J. Barlow, Jean-Arcady Meyer, A. D. Schaile, Gabriella Pasztor, V. Zacek, K. Roscoe, W.J. McDonald, J. Lauber, S. Robertson, M. F. Turner-Watson, F. Scharf, M. Fierro, M. Jimack, Ekg Sarkisyan, R. G. Kellogg, T. Kobayashi, P. Vannerem, German Martinez, N. K. Watson, Tara Shears, D. Lui, S. M. Gascon-Shotkin, Shoji Asai, A. Michelini, Beatrix Dienes, Peter R Hobson, D. S. Koetke, Reda Tafirout, Klaus Kurt Desch, G. D. Lafferty, D. I. Futyan, Sven Menke, Marcello Mannelli, I. J. Bloodworth, E. Torrence, Richard Teuscher, A. S. Turcot, Dave Charlton, D. Zer-Zion, K. Stoll, G. A. Snow, Andris Skuja, J. Goldberg, Claire Shepherd-Themistocleous, Stefano Marcellini, F. Fiedler, B. Nellen, C. P. Ward, S. D. Talbot, S. Petzold, C. Y. Chang, E. Clay, Sachio Komamiya, R. L. Coxe, M. Przybzien, M. A. Thomson, Theodoros Geralis, G. W. Wilson, P. G. Estabrooks, R. K. Keeler, W. M. Sang, S. Söldner-Rembold, Tetsuro Mashimo, Yoram Rozen, P. Taras, A. Hocker, R. Bürgin, P. Vikas, E. K. U. Gross, D. Eatough, D. Chrisman, G. D. Long, D. Lanske, J. Letts, A. A. Faust, W. R. Gibson, Volker Blobel, S. R. Lautenschlager, M. Sproston, T. P. Kokott, P. M. Watkins, H. G. Evans, M. Kolrep, W. Gorn, T. Saeki, S. D. Bird, I. Cohen, Georges Azuelos, T. Behnke, E. Tsur, J. Polok, A. Joly, D. Karlen, O. Runolfsson, Christoph Rembser, Alessandra Fanfani, D. Axen, R. Davis, Satoru Yamashita, M. Verzocchi, K. W. Bell, A. M. Rossi, K. Sachs, Shlomo Dado, A. Jawahery, A. Macchiolo, Claudio Grandi, P. Scharff-Hansen, J. Pálinkás, R. M. Brown, C. M. Hawkes, C. Sbarra, Lorne Levinson, Stefan Kluth, Peter Sherwood, Alexander Wagner, Shlomit Tarem, J. M. Roney, J. C. Hill, F. R. Jacob, J. Ludwig, K. Runge, Richard Nisius, A. M. Smith, P. Bock, B. List, Marco Cuffiani, S. F. Ashby, J. Schieck, W. Mohr, C. Hartmann, D. E. Plane, Stephen Hillier, Paul Kyberd, F. K. Loebinger, G. M. Dallavalle, Michael Hildreth, J. Steuerer, Ivor Fleck, N. L. Rodning, B. Poli, Joleen Pater, A. Klier, P. Poffenberger, Satoshi Mihara, K. Stephens, C. Littlewood, G. Yekutieli, T. R. Junk, I. Trigger, D. R. Ward, T. Kress, A. A. Carter, Ron Folman, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, J. Böhme, P. E.L. Clarke, J. P. Martin, D. Lazic, S. De Jong, H. Rick, J. von Krogh, M. Gruwé, L. A. del Pozo, G. G. Hanson, G. Giacomelli, I. Lawson, A. De Roeck, M. Kobel, M. S. Dixit, Frans Meijers, O. C. Cooke, P. Pfeifenschneider, J. Patt, André Schöning, O. Sahr, A. Biguzzi, J. G. Layter, Paolo Giacomelli, M. Hansroul, C. Burgard, R. J. Homer, Achim Stahl, Kiyotomo Kawagoe, R. Van Kooten, K. R. Hossain, D. C. Imrie, G. P. Siroli, Christoph Schwick, F. Wäckerle, D. M. Gingrich, D. M. Strom, M. Fanti, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, K. Nagai, Shigenori Tanaka, D. R. Rust, A. M. Lee, E. von Törne, P. S. Wells, Terry Richard Wyatt, A. T. Watson, A. Macpherson, R. J. Sobie, R. Howard, J. S. White, Gregor Herten, J. E. Pilcher, A. W. Lloyd, M. Hauschild, and C. Markopoulos
Subjects: Physics, Particle physics, Energy distribution, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Particle identification, Nuclear physics, Tau neutrino, Pi, High Energy Physics::Experiment, Invariant mass, Limit (mathematics), Engineering (miscellaneous), ALEPH experiment
Abstract: An upper limit for the $\tau$–neutrino mass has been determined from the decay $\tau\rightarrow 5\pi^{\pm}\nu_{\tau}$ using data collected with the OPAL detector from 1991 to 1995 in $\rm e^{+}e^{-}$ collisions at $\sqrt{s}\approx M_\mathrm{Z}$. A limit of 43.2 MeV at 95% CL is obtained using a two–dimensional method in the $5\pi$ invariant mass and energy distribution from 22 selected events. Combining this result with OPAL's previously published measurement using $\rm \tau^{+}\tau^{-}\rightarrow 3h^{\pm}\bar{\nu}_{\tau}+3h^{\mp}\nu_{\tau}$ decays, a new combined limit of \(m_{\nu_{\tau}}
Published: 1998
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11. Bose-Einstein correlations of three charged pions in hadronic Z $^{\bf 0}$ decays

Author: Erez Etzion, Stefan Kluth, Shlomit Tarem, S. A. Robins, T. Schorner, J. Grunhaus, Tara Shears, R. Liebisch, K. Ackerstaff, Sachio Komamiya, Theodoros Geralis, A. T. Watson, T. P. Kokott, T. Saeki, Alessandra Fanfani, G. Yekutieli, Otmar Biebel, G. G. Hanson, W. R. Gibson, H. M. Fischer, M. Przybycień, M. F. Turner-Watson, Peter R Hobson, J. Goldberg, D. Zer-Zion, M. Fierro, B. Nellen, S. R. Lautenschlager, A. A. Carter, Ron Folman, G. Giacomelli, I. Lawson, M. Boutemeur, F. S. Merritt, H. G. Evans, Gideon Bella, H. J. Burckhart, I. Cohen, Christoph Rembser, A. De Roeck, M. Kobel, O. Runolfsson, M. S. Dixit, Frans Meijers, J. Letts, R. M. Brown, Lorne Levinson, Matthias Schröder, A. W. Lloyd, P. I. Kayal, P. Gagnon, W. M. Sang, Jacqueline Batley, Claudio Grandi, M. Thiergen, J. Bechtluft, J. A. McKenna, Satoshi Mihara, Ekg Sarkisyan, P. E.L. Clarke, S. Yamashita, Kiyotomo Kawagoe, J. P. Martin, Ehud Duchovni, K. Sachs, K. Roscoe, J. von Krogh, M. Hauschild, C. Markopoulos, Norbert Wermes, Sherry Towers, S. De Jong, A. Sittler, Shlomo Dado, T. Kawamoto, Zoltan Laszlo Trocsanyi, P. Vikas, M. Jimack, Claire Shepherd-Themistocleous, P. Igo-Kemenes, P. G. Estabrooks, N. K. Watson, M. Gruwé, Reda Tafirout, Klaus Kurt Desch, A. J. Martin, H. Rick, R. Bartoldus, G. W. Wilson, A. Joly, D. Lanske, S. Orito, L. A. del Pozo, Claudia Ciocca, K. Ishii, H. Jeremie, A. Michelini, E. Torrence, Achim Stahl, E. Clay, H. O. Ogren, S. Betts, M. Hapke, Giora Mikenberg, Satoshi Tanaka, T. Kobayashi, P. M. Watkins, Georges Azuelos, K. Stephens, S. D. Bird, C. Sbarra, F. R. Jacob, E. Tsur, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, C. K. Hargrove, K. Nagai, Michael Hildreth, M. Bobinski, J. A. Wilson, S. F. Ashby, K. R. Hossain, N. L. Rodning, J. Böhme, A. D. Schaile, Gabriella Pasztor, C. Hartmann, Christoph Geich-Gimbel, P. S. Wells, Vakhtang Kartvelishvili, P. Vannerem, M. Verzocchi, K. W. Bell, J. Pálinkás, J. C. Hill, O. Schaile, B. Poli, D. Axen, A. Jawahery, Stefan Schmitt, C. Littlewood, A. Biguzzi, D. E. Plane, R. L. Coxe, Silvia Arcelli, M. J. Oreglia, Stephen Hillier, D. Lui, Paul Kyberd, F. K. Loebinger, J. G. Layter, J. E. Conboy, G. M. Dallavalle, A. Fürtjes, James Pinfold, R. Perez-Ochoa, R. Seuster, W. J. McDonald, B. C. Shen, V. Gibson, D. Lazic, G. A. Snow, C. P. Ward, A. Hocker, Terry Richard Wyatt, D. R. Rust, C. R. Jones, J. Steuerer, Ivor Fleck, J. R. Carter, G. N. Patrick, Siegfried Bethke, A. K. Honma, W. G. Scott, Randall Sobie, S. M. Gascon-Shotkin, S. Söldner-Rembold, S. Baumann, S. Robertson, Joleen Pater, D. Chrisman, G. D. Long, Peter Sherwood, G. D. Lafferty, Gregor Herten, T. R. Junk, S. W. O'Neale, I. Nakamura, A. Klier, E. A. Mckigney, Volker Blobel, Alexander Wagner, I. Trigger, K. J. Anderson, Sven Menke, A. M. Rossi, J. Ludwig, Raimund Ströhmer, D. R. Ward, N. Altekamp, H. Voss, K. Runge, T. Kress, P. Bock, D. Glenzinski, Dezso Horvath, M. J. Losty, J. M. Roney, J. Lauber, Stephen Lloyd, J. E. Pilcher, Jean-Arcady Meyer, Dave Charlton, D. I. Futyan, R. J. Barlow, A. M. Lee, D. J. Miller, J. Gascon, P. Poffenberger, D. C. Imrie, John Allison, D. M. Strom, E. von Törne, R. Bürgin, S. D. Talbot, Guenter Duckeck, Paolo Giacomelli, R. Kowalewski, D. Eatough, G. P. Siroli, Shoji Asai, M. Hansroul, Christoph Schwick, Beatrix Dienes, C. Burgard, R. G. Kellogg, M. Fanti, Gideon Alexander, R. J. Homer, Paolo Capiluppi, S. B. Anderson, Daniel Lellouch, R. Mir, C. Y. Chang, R. Hawkings, A. Macpherson, Stefano Marcellini, Richard Keeler, O. C. Cooke, J. W. Gary, Takehiko Mori, P. Taras, P. Pfeifenschneider, Robert McPherson, R. Howard, D. S. Koetke, J. S. White, Mathieu Doucet, J. Patt, André Schöning, P. Mättig, R. D. Heuer, Fabrizio Fabbri, Marcello Mannelli, O. Sahr, Stan Bentvelsen, R. Van Kooten, K. Stoll, V. Zacek, F. Wäckerle, Andris Skuja, D. M. Gingrich, S. Petzold, Tetsuro Mashimo, Richard Teuscher, A. S. Turcot, F. Fiedler, F. G. Oakham, W. Gorn, B. Schmitt, E. L. Barberio, M. Kolrep, I. J. Bloodworth, P. Scharff-Hansen, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Yoram Rozen, Peter Krieger, Alessandro Montanari, A. M. Smith, J. Polok, D. Karlen, A. A. Faust, T. Behnke, A. Macchiolo, C. M. Hawkes, Richard Nisius, B. List, Marco Cuffiani, H. Mes, I. P. Duerdoth, S. Braibant, P. Hüntemeyer, R. Davis, P. G. Bright-Thomas, M. Schumacher, E. Lefebvre, F. Odorici, H. A. Neal, F. Scharf, German Martinez, M. A. Thomson, E. K. U. Gross, M. Sproston, J. Schieck, and W. Mohr
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Nuclear Theory, Hadron, Bose–Einstein correlations, Lambda, Nuclear physics, Near threshold, Pion, Coulomb, High Energy Physics::Experiment, Nuclear Experiment, Coulomb effect, Engineering (miscellaneous)
Abstract: Bose-Einstein Correlations (BEC) of three identical charged pions were studied in $4 \times 10^6$ hadronic ${\rm Z}^0$ decays recorded with the OPAL detector at LEP. The genuine three-pion correlations, corrected for the Coulomb effect, were separated from the known two-pion correlations by a new subtraction procedure. A significant genuine three-pion BEC enhancement near threshold was observed having an emitter source radius of $r_3 = 0.580 \pm 0.004 \mbox{ (stat.)} \pm 0.029 \mbox{ (syst.)} \mbox{ fm}$ and a strength of $\lambda_3 = 0.504 \pm 0.010 \mbox{ (stat.)}\pm 0.041 \mbox{ (syst.)}$ . The Coulomb correction was found to increase the $\lambda_3$ value by $\sim $ 9% and to reduce $r_3$ by $\sim $ 6%. The measured $\lambda_3$ corresponds to a value of $0.707 \pm 0.014 \mbox{ (stat.)} \pm 0.078 \mbox{ (syst.)}$ when one takes into account the three-pion sample purity. A relation between the two-pion and the three-pion source parameters is discussed.
Published: 1998
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12. Search for anomalous production of photonic events with missing energy in ${\rm e^+e^-}$ collisions at $\sqrt{s} = 130$ –172 GeV

Author: A. Klier, P. Routenburg, C. Dallapiccola, M. Hauschild, C. Markopoulos, C. Markus, G. T. Jones, E. H. Vokurka, N. Altekamp, H. Voss, S. Orito, W. Gorn, S. R. Lautenschlager, H. A. Neal, R. J. Barlow, D. J. Miller, Stefan Kluth, E. K.G. Sarkisyan, U. Ruppel, M. R. Ingram, J. Lauber, S. Betts, M. Hapke, W. J. McDonald, A. Sittler, P. G. Estabrooks, O. Runolfsson, G. W. Wilson, V. Zacek, D. E. Hutchcroft, N. J. Oldershaw, Gideon Bella, R. Howard, U. Jost, N. K. Watson, S. D. Talbot, G. Yekutieli, P. Scharff-Hansen, A. D. Schaile, H. J. Burckhart, Jacqueline Batley, C. Beeston, M. J. Oreglia, W. M. Sang, Gregor Herten, B. Wilkens, A. Biguzzi, Raimund Ströhmer, N. Rodning, P. M. Watkins, A. Rooke, J. E. Pilcher, Gabriella Pasztor, Claudio Grandi, J. Grunhaus, D. C. Imrie, P. R. Hobson, J. G. Layter, I. Nakamura, A. K. Honma, R. Van Kooten, F. G. Oakham, D. Eatough, B. Schmitt, E. L. Barberio, R. Bartoldus, D. Lui, B. Nellen, A. M. Smith, A. Oh, Paolo Capiluppi, J-P. Meyer, John Allison, Richard Keeler, R. J. Hemingway, H. O. Ogren, L. Levinson, G. D. Long, M. Schumacher, K. Stephens, G. A. Snow, C. P. Ward, E. Lefebvre, R. L. Coxe, Christoph Geich-Gimbel, J. R. Carter, Georges Azuelos, C. R. Jones, G. Mikenberg, T. Kawamoto, Stefan Schmitt, A. Macpherson, B. W. Kennedy, P. Jovanovic, R. Lahmann, Austin Ball, S. Söldner-Rembold, F. Odorici, A. Hocker, G. N. Patrick, Peter Krieger, R. G. Kellogg, P. E.L. Clarke, Alessandro Montanari, R. Davis, Silvia Arcelli, Hans-Christian Schultz-Coulon, Csaba Hajdu, D. Chrisman, R. Perez-Ochoa, G. D. Lafferty, M. Verzocchi, K. W. Bell, Otmar Biebel, H. G. Evans, M. J. Goodrick, P. Igo-Kemenes, N. I. Geddes, Michael Hildreth, P. Gagnon, M. K. Jones, J. P. Martin, J. Letts, Christoph Rembser, E. Tsur, S. Komamiya, V. Gibson, J. S. White, Stefano Marcellini, C. Hartmann, D. G. Fong, J. Gascon, D. E. Plane, S. Dado, J. Pinfold, J. C. Hill, D. Lazic, T. J. McMahon, C. Couyoumtzelis, P. Mättig, S. Asai, Vakhtang Kartvelishvili, G. P. Siroli, S. De Jong, Christoph Schwick, K. Ackerstaff, F. Fiedler, F. Wäckerle, L. Brigliadori, S. Baumann, H. Jeremie, Stephen Lloyd, Stephen Hillier, R. K. Carnegie, E. Gross, Dave Charlton, B. Poli, F. Scharf, German Martinez, I. J. Bloodworth, Peter Schleper, K. Kawagoe, J. E. Conboy, A. Fürtjes, K. Sachs, J. Goldberg, E. A. Mckigney, S. Tarem, B. C. Shen, G. M. Dallavalle, T. R. Junk, J. M. Roney, M. Fierro, J. E.G. Edwards, R. Bürgin, H. M. Fischer, A. N. Bell, D. M. Gingrich, M. Herndon, B. Dienes, I. Trigger, A. Joly, J. W. Gary, W. P. Lai, D. S. Koetke, Marcello Mannelli, Guenter Duckeck, Lutz Feld, R. Mir, M. Bobinski, Norbert Wermes, Sherry Towers, Paolo Giacomelli, J. A. Wilson, M. Hansroul, D. R. Ward, M. Jimack, Siegfried Bethke, T. Kress, W. G. Scott, A. Michelini, H. Mes, O. Schaile, P. W. Jeffreys, M. Foucher, I. P. Duerdoth, S. D. Bird, G. G. Hanson, A. M. Lee, G. Alexander, M. Boutemeur, F. S. Merritt, Richard Teuscher, S. Braibant, S. Yamashita, R. Rylko, B. Stockhausen, Paul Kyberd, F. K. Loebinger, D. I. Futyan, A. S. Turcot, C. Burgard, I. Cohen, Ivor Fleck, G. Giacomelli, S. W. O'Neale, A. Jawahery, Joleen Pater, M. F. Turner-Watson, R. W. Springer, R. J. Homer, D. Karlen, T. Saeki, P. I. Kayal, S. F. Ashby, R. Giacomelli, Sven Menke, Daniele Bonacorsi, Z. Trácsanyi, Peter Sherwood, S. Mihara, S. M. Gascon-Shotkin, M. A. Thomson, S. Robertson, D. Glenzinski, Dezso Horvath, M. J. Losty, R. Sobie, M. S. Dixit, Frans Meijers, P. S. Wells, J. Bechtluft, K. J. Anderson, M. Fanti, D. Zer-Zion, V. Blobel, J. A. McKenna, J. Ludwig, Reda Tafirout, Klaus Kurt Desch, S. A. Robins, R. Hawkings, K. Runge, P. Bock, E. Torrence, S. Petzold, Matthew Evans, A. M. Rossi, M. Kolrep, M. Sproston, Terry Richard Wyatt, C. Y. Chang, P. Vikas, D. Lanske, T. Mori, J. von Krogh, D. Lellouch, W. R. Gibson, J. E. Bloomer, D. Axen, K. R. Hossain, S. B. Anderson, J. Pálinkás, J. Kirk, P. Szymanski, P. Taras, Michael Kobel, R. M. Brown, E. von Tärne, Theodoros Geralis, A. Skillman, O. C. Cooke, P. Pfeifenschneider, A. T. Watson, L. A. del Pozo, Stan Bentvelsen, Allen Mincer, T. P. Kokott, T. Mashimo, Alessandra Fanfani, J. Patt, André Schöning, Robert McPherson, C. Sbarra, P. Huntemeyer, A. A. Carter, Ron Folman, T. Kobayashi, Mathieu Doucet, R. D. Heuer, P. Utzat, A. A. Faust, Fabrizio Fabbri, J. Schieck, D. M. Strom, E. Duchovni, W. Mohr, A. Posthaus, K. Nagai, D. R. Rust, J. Kanzaki, S. Tanaka, Tara Shears, P. A. Hart, P. Poffenberger, K. Ishii, Claire Shepherd-Themistocleous, A. Wagner, Matthias Schröder, T. Behnke, J. Steuerer, M. Thiergen, A. Macchiolo, M. Gruwé, C. M. Hawkes, Richard Nisius, Marco Cuffiani, U. Müller, A. J. Martin, C. K. Hargrove, K. Stoll, Andris Skuja, and Y. Rozen
Subjects: Physics, Particle physics, Missing energy, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Physics beyond the Standard Model, Standard Model, Nuclear physics, Pair production, Neutralino, High Energy Physics::Experiment, Production (computer science), Engineering (miscellaneous), Energy (signal processing)
Abstract: Photonic events with large missing energy have been observed in $\mathrm{e^+e^-}$ collisions at centre-of-mass energies of 130, 136, 161 and 172 GeV using the OPAL detector at LEP. Results are presented based on search topologies designed to select events with a single photon and missing transverse energy or events with a pair of acoplanar photons. In both search topologies, cross-section measurements are performed within the kinematic acceptance of the selection. These results are compared with the expectations from the Standard Model processes ${\rm e^+e^-}\to \nu\overline\nu \gamma (\gamma )$ (single-photon) and ${\rm e^+e^-}\to \nu\overline\nu \gamma \gamma (\gamma )$ (acoplanar-photons). No evidence is observed for new physics contributions to these final states. Upper limits on $\sigma({\rm e^+e^- \to XY)\cdot BR(X\to Y\gamma })$ and $\sigma({\rm e^+e^- \to XX)\cdot BR^2(X\to Y\gamma })$ are derived for the case of stable and invisible Y. These limits apply to single and pair production of excited neutrinos (${\rm X}= \nu^*,{\rm Y}= \nu$), to neutralino production (${\rm X}=\tilde\chi^0_2, {\rm Y}=\tilde\chi^0_1$), and to supersymmetric models in which ${\rm X}= \tilde\chi^0_1$ and ${\rm Y}=\tilde{\rm G}$ is a light gravitino. For the latter scenario, the results of the acoplanar-photons search are used to provide mode l-dependent lower limits on the mass of the lightest neutralino.
Published: 1998
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13. Multi-photon final states in e+e− collisions at ∝s =130-172 GeV

Author: S. Petzold, G. D. Long, Tetsuro Mashimo, J. M. Roney, Anna Macchiolo, W. Gorn, Gabriella Pasztor, S. D. Bird, P. E. L. Clarke, W. Mohr, A. Posthaus, Matthias Schröder, G. A. Snow, S. R. Lautenschlager, H. A. Neal, M. Jimack, C. P. Ward, John Allison, B. Schmitt, K. Nagai, Eduardo Ros, N. K. Watson, S. M. Gascon-Shotkin, M. Thiergen, D. L. Rees, S. Söldner-Rembold, Kiyotomo Kawagoe, S. J. De Jong, Satoshi Mihara, Daniel Lellouch, Hildreth, P. Scharff-Hansen, C.J. Beeston, A. P. Wagner, Frank Fiedler, D. Axen, S. Komamiya, A. Jawahery, David G. Charlton, Gideon Bella, BT Bouwens, Rick J. Van Kooten, Eugene P. Gross, F. Wäckerle, Paolo Giacomelli, Takehiko Mori, H. J. Burckhart, Jacqueline Batley, M. Hansroul, Georges Azuelos, E. Tsur, C. M. Hawkes, S. H. Robertson, J. Goldberg, B. Nellen, N. J. Oldershaw, E. Lefebvre, J. Steuerer, A. M. Rossi, Isabel Marian Trigger, K. W. Bell, F. Scharf, German Martinez, Gideon Alexander, Otmar Biebel, Marco Verzocchi, R. Bartoldus, J. W. Gary, J. Palinkas, K. Sachs, F. Odorici, R. G. Kellogg, C. H. Shepherd-Themistocleous, R. J. Homer, D. S. Koetke, Csaba Hajdu, Stefano Marcellini, James Letts, A. D. Schaile, A. S. Turcot, P. Igo-Kemenes, Gy. Wolf, Shigenori Tanaka, Shlomo Dado, K. Ishii, K. R. Hossain, Paolo Capiluppi, P.A. Hart, H. Jeremie, H. O. Ogren, J. C. Hill, R. J. Teuscher, A. M. Smith, A. Michelini, V. Kartvelishvili, S. A. Robins, D. Rigby, R. J. Hemingway, Christoph Geich-Gimbel, D. R. Rust, J. Ludwig, B. C. Shen, K. Runge, P. Bock, J. R. Carter, P. I. Kayal, T. Behnke, Siegfried Bethke, G. Duckeck, W. G. Scott, P. G. Estabrooks, V. Gibson, H. G. Evans, P. Szymanski, M. J. Goodrick, Doug Gingrich, J. A. McKenna, I. Cohen, P. Jovanovic, I. J. Bloodworth, James Pinfold, I. Nakamura, R. Perez-Ochoa, E. do Couto e Silva, Ehud Duchovni, E. von Törne, C. R. Jones, Richard Nisius, U. Müller, T. Kress, Peter Krieger, D. G. Fong, Carla Sbarra, J. Gascon, P. Gagnon, Dezso Horvath, M. J. Losty, Sven Menke, Alessandro Montanari, A. J. Martin, K. Ackerstaff, P. M. Watkins, Takayuki Saeki, Jean-Arcady Meyer, Sherry Towers, T. Kawamoto, Marco Cuffiani, N. L. Rodning, A. Skillman, D. E. Hutchcroft, C. Dallapiccola, M. Kolrep, D. Karlen, Carsten Daniel Burgard, B. Poli, G. Mikenberg, O. Schaile, I. P. Duerdoth, Yoram Rozen, V. Zacek, A. Sittler, S. Orito, A. K. Honma, N. Altekamp, M. Foucher, Claudio Grandi, Peter Schleper, C. K. Hargrove, Zoltan Laszlo Trocsanyi, S. J. Hillier, Tara Shears, Robert McPherson, B. Stockhausen, P. Kyberd, P. Hüntemeyer, S. B. Anderson, F. K. Loebinger, D. J. Miller, A. H. Ball, Silvia Arcelli, M. F. Turner-Watson, Meirin Oan Evans, D. C. Imrie, Mathieu Doucet, M. Hapke, R. Bürgin, Marcello Mannelli, D. M. Strom, Matthew Herndon, Fabrizio Fabbri, M. Morii, Markus Schumacher, E.K.G. Sarkisian, H. Voss, G. W. Wilson, Peter R Hobson, Ivor Fleck, G. P. Siroli, S. Baumann, M. J. Pearce, U. Jost, R. Mir, Stan Bentvelsen, Christoph Schwick, J.A. Lauber, M. J. Oreglia, H. Mes, D Chrisman, E. A. Mckigney, S. Braibant, J. E. Conboy, S. D. Talbot, M. Sproston, Joleen Pater, Peter Sherwood, D. Zer-Zion, W. P. Lai, A. Fürtjes, Stefan Kluth, T. Geralis, R. D. Heuer, Shlomit Tarem, F. G. Oakham, Stefan Schmitt, Norbert Wermes, G. N. Patrick, E. L. Barberio, A. Klier, D. Eatough, R. Giacomelli, G. D. Lafferty, D. I. Futyan, Volker Blobel, P. Routenburg, T. R. Wyatt, Jochen Schieck, T. R. Junk, M. Gruwe, Hans-Christian Schultz-Coulon, Thomson, M. J. Kobel, P. Mättig, Shoji Asai, Stephen Lloyd, A. A. Faust, D. Glenzinski, Satoru Yamashita, Robert M Brown, Gregor Herten, R. Rylko, Robert Wayne Springer, M. Boutemeur, M. Fierro, J. E.G. Edwards, F. S. Merritt, T. P. Kokott, Dixit, P. W. Jeffreys, P. S. Wells, David E. Plane, B. Wilkens, J. E. Bloomer, T. Kobayashi, A. M. Lee, A. Macpherson, Richard Keeler, P. Vikas, R. J. Sobie, Robert Lahmann, R. Howard, J. S. White, Alexander Oh, J. E. Pilcher, D. Lanske, J. Bechtluft, M. Hauschild, C. Markus, G. T. Jones, E. H. Vokurka, P R Poffenberger, J. Grunhaus, C. Hartmann, H. Fischer, O. Runolfsson, Alan Watson, Matthew Jones, Reda Tafirout, Klaus Kurt Desch, W. R. Gibson, A. Joly, Lorne Levinson, B. W. Kennedy, N. I. Geddes, Roger Barlow, K. Stephens, W.John McDonald, D. Lazic, D. R. Ward, U. Ruppel, M. R. Ingram, C. Y. Chang, P. Taras, G. Yekutieli, Allen Mincer, Marcello Fanti, Julie Kirk, P. Pfeifenschneider, A. A. Carter, Ron Folman, J. Patt, André Schöning, G. G. Hanson, G.Marco Dallavalle, P. Utzat, Beatrix Dienes, L. Brigliadori, G. Giacomelli, Daniele Bonacorsi, O. C. Cooke, S. W. O'Neale, R. Davies, P. Schenk, K. J. Anderson, J. von Krogh, Frans Meijers, R. J. Hawkings, L. A. del Pozo, A. Biguzzi, A. Rooke, J. G. Layter, T. J. McMahon, R. K. Carnegie, M. Bobinski, J. A. Wilson, J.P. Martin, A. N. Bell, K. Stoll, and Andris Skuja
Subjects: Nuclear physics, Physics, Particle physics, Angular distribution, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Engineering (miscellaneous)
Published: 1998
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14. Production of P-wave charm and charm-strange mesons in hadronic Z $^0$ decays

Author: Matthias Schröder, D. L. Rees, M. A. Thomson, E. K. U. Gross, M. Sproston, F. Scharf, G. G. Hanson, German Martinez, M. Thiergen, Hans-Christian Schultz-Coulon, Randall Sobie, G. Giacomelli, J. Letts, Michael Schulz, G. D. Lafferty, H. M. Fischer, J. Schieck, W. Mohr, Ekg Sarkisyan, M. Fanti, A. Posthaus, J. Lauber, L. Brigliadori, K. Stoll, Gideon Bella, R. W. Springer, H. Mes, I. P. Duerdoth, Otmar Biebel, H. J. Burckhart, J. Grunhaus, P. W. Jeffreys, K. Sachs, Shlomo Dado, Andris Skuja, Jacqueline Batley, J. Goldberg, B. Nellen, S. Petzold, Tetsuro Mashimo, Tara Shears, P. A. Hart, Daniel Lellouch, Robert McPherson, Takehiko Mori, Mathieu Doucet, Guenter Duckeck, P. G. Estabrooks, D. Chrisman, G. D. Long, Volker Blobel, S. D. Talbot, S. W. O'Neale, S. Yamashita, P. Igo-Kemenes, K. Ishii, H. Jeremie, Stephen Lloyd, R. D. Heuer, Robert M Brown, Fabrizio Fabbri, M. J. Pearce, V. Zacek, K. J. Anderson, Georges Azuelos, Reda Tafirout, Klaus Kurt Desch, Kiyotomo Kawagoe, A. Joly, R. Van Kooten, D. Eatough, N. K. Watson, E. Tsur, H. G. Evans, Giora Mikenberg, W. Gorn, C. R. Jones, M. J. Goodrick, P. M. Watkins, Claire Shepherd-Themistocleous, S. B. Anderson, M. Verzocchi, P. Szymanski, Norbert Wermes, K. W. Bell, Sherry Towers, I. Cohen, P. Poffenberger, O. Schaile, M. Schumacher, E. do Couto e Silva, C. Sbarra, E. Lefebvre, P. Vikas, J. Pálinkás, T. Kawamoto, S. Braibant, W. R. Gibson, F. Odorici, A. D. Schaile, F. Wäckerle, N. I. Geddes, D. Lanske, D. M. Gingrich, M. F. Turner-Watson, Michael Hildreth, M. Morii, J. C. Hill, P. Gagnon, Gabriella Pasztor, B. T. Bouwens, Sven Menke, U. Müller, Peter R Hobson, S. Orito, M. Rosvick, John Allison, Dave Charlton, P. Scharff-Hansen, S. R. Lautenschlager, Stan Bentvelsen, W. J. McDonald, N. L. Rodning, H. A. Neal, B. C. Shen, D. Zer-Zion, A. J. Martin, Lorne Levinson, A. Sittler, P. Routenburg, P. Berlich, M. Hapke, B. Poli, K. Nagai, G. A. Snow, C. P. Ward, Sachio Komamiya, Peter Schleper, Gideon Alexander, Theodoros Geralis, A. A. Faust, Stefan Kluth, A. Skillman, R. Bürgin, P. Pfeifenschneider, Paolo Capiluppi, Stefan Schmitt, E. Ros, Siegfried Bethke, T. Hilse, D. R. Rust, D. E. Hutchcroft, R. Lahmann, Shlomit Tarem, A. K. Honma, Silvia Arcelli, D. C. Imrie, C. Y. Chang, S. Söldner-Rembold, A. M. Smith, R. G. Kellogg, C. Hartmann, U. Ruppel, M. R. Ingram, W. G. Scott, Richard Teuscher, A. S. Turcot, O. Runolfsson, D. E. Plane, I. Nakamura, T. P. Kokott, C. K. Hargrove, Stephen Hillier, J. Patt, G. M. Dallavalle, André Schöning, T. Behnke, Csaba Hajdu, F. Fiedler, A. M. Lee, T. Saeki, M. J. Oreglia, P. Taras, E. von Törne, Michael Kobel, S. D. Bird, P. Schenk, Ehud Duchovni, Alan Watson, Stefano Marcellini, G. P. Siroli, C. Beeston, Christoph Schwick, S. Baumann, D. Axen, M. Jimack, S. A. Robins, James Pinfold, A. Jawahery, Claudio Grandi, S. M. Gascon-Shotkin, P. Mättig, D. Glenzinski, J. R. Carter, G. N. Patrick, Allen Mincer, E. A. Mckigney, Gunter Wolf, Julie Kirk, D. G. Fong, A. Michelini, K. Ackerstaff, Dezso Horvath, M. J. Losty, J. Gascon, M. Kolrep, A. Macchiolo, Shoji Asai, B. Stockhausen, Paul Kyberd, F. K. Loebinger, W. P. Lai, Peter Sherwood, Jean-Arcady Meyer, Satoshi Tanaka, J. Steuerer, M. Gruwé, C. M. Hawkes, K. Stephens, Ivor Fleck, I. J. Bloodworth, Alexander Wagner, T. Kobayashi, J. Ludwig, Joleen Pater, J. W. Gary, Paolo Giacomelli, D. S. Koetke, M. Hansroul, K. Runge, P. Bock, A. Klier, Marcello Mannelli, R. Giacomelli, V. Gibson, Richard Nisius, J. M. Roney, C. Burgard, Marco Cuffiani, Yoram Rozen, T. R. Junk, D. I. Futyan, R. J. Homer, I. Trigger, M. Foucher, M. Fierro, J. E.G. Edwards, D. R. Ward, T. Kress, Matthew Evans, D. Karlen, A. M. Rossi, U. Jost, R. Mir, R. Hawkings, F. G. Oakham, B. Schmitt, E. L. Barberio, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Alessandro Montanari, C. Dallapiccola, N. Altekamp, H. Voss, R. J. Barlow, D. J. Miller, S. Robertson, Gregor Herten, B. Wilkens, J. E. Pilcher, G. W. Wilson, M. Hauschild, C. Markus, G. T. Jones, E. H. Vokurka, N. J. Oldershaw, M. S. Dixit, Frans Meijers, A. Biguzzi, A. Rooke, J. G. Layter, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, H. Przysiezniak, A. N. Bell, G. Yekutieli, A. A. Carter, Ron Folman, P. Utzat, Daniele Bonacorsi, O. C. Cooke, J. von Krogh, L. A. del Pozo, T. J. McMahon, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, D. Lazic, A. Macpherson, Richard Keeler, R. Bartoldus, R. Howard, J. S. White, H. O. Ogren, Christoph Geich-Gimbel, J. E. Conboy, Vakhtang Kartvelishvili, A. Fürtjes, M. Boutemeur, F. S. Merritt, D. M. Strom, J. Bechtluft, J. A. McKenna, R. Rylko, P. S. Wells, Terry Richard Wyatt, and J. E. Bloomer
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Hadronization, Nuclear physics, Excited state, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Nuclear Experiment, Particle Physics - Experiment, K channels
Abstract: Results are presented on the production of excited charm and excited charm-strange mesons in hadronic Z(0) decays. The results are obtained from approximately 4.3 million hadronic Z(0) decays, collected on or near the Z(0) resonance using the OPAL detector at LEP. The D-1(0)(2420) and D*(0)(2)(2460) mesons are reconstructed in the D*(+)pi(-) final state and their separate production rates in charm fragmentation and in weak decays of b-hadrons are determined. Assuming that the decay widths of these mesons are saturated by the allowed D*pi and D pi final states, the charm hadronization fractions and the inclusive branching ratios of b-hadrons to these neutral P-wave charm mesons are determined to bef(c --> D-1(0)) = 0.021 +/- 0.007(stat) +/- 0.003(syst), f(c --> D*(0)(2)) = 0.052 +/- 0.022(stat)+/- 0.013(syst), f(b --> D-1(0)) = 0.050 +/- 0.014(stat) +/- 0.006(syst), f(b --> D*(0)(2)) = 0.047 +/- 0.024(stat) +/- 0.013(syst).We also present the first observation at LEP of the D-s1(+)(2536) meson which is reconstructed in both the D*K-+(s)0 and D*K-0(+) final states After correcting for the expected contribution from bb events, assuming that the D*K channels saturate the available final states, these results are used to derive the charm hadronization fraction f(c --> D-s1(+)):f(c --> D-s1(+)) = 0.016 +/- 0.004(stat) +/- 0.003(syst).
Published: 1997
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15. Study of $\phi(1020)$ , ${\rm D}^{\pm}$ and B $^$ spin alignment in hadronic Z $^0$ decays

Author: Achim Stahl, P. Pfeifenschneider, J. Patt, Paolo Giacomelli, M. Hansroul, C. Burgard, R. J. Homer, Ekg Sarkisyan, P. W. Jeffreys, W. R. Gibson, J. J. Ward, P. Vikas, D. Lanske, S. R. Lautenschlager, H. A. Neal, B. T. Bouwens, T. Hilse, O. Runolfsson, R. M. Brown, A. Joly, Lorne Levinson, C. Beeston, Claudio Grandi, Dave Charlton, O. C. Cooke, A. Skillman, Claire Shepherd-Themistocleous, R. Lahmann, R. Bürgin, Reda Tafirout, Klaus Kurt Desch, D. C. Imrie, J. von Krogh, Gideon Bella, H. J. Burckhart, Jacqueline Batley, A. A. Faust, T. Omori, C. R. Jones, Abish Malik, C. Hartmann, D. E. Plane, G. P. Siroli, L. A. del Pozo, Stephen Hillier, U. Jost, G. M. Dallavalle, R. Mir, R. Hawkings, G. Yekutieli, Hans-Christian Schultz-Coulon, Alan Watson, S. G. Clowes, A. Biguzzi, A. Rooke, Randall Sobie, Michael Schulz, G. D. Lafferty, J. G. Layter, S. Yamashita, A. A. Carter, Ron Folman, Roger Jones, F. G. Oakham, T. Behnke, M. Fierro, J. E.G. Edwards, P. Igo-Kemenes, B. Schmitt, E. L. Barberio, J. Letts, K. Ishii, H. Jeremie, P. E.L. Clarke, M. K. Jones, P. Utzat, S. D. Bird, Kiyotomo Kawagoe, F. X. Gentil, A. Macchiolo, M. Gruwé, C. M. Hawkes, R. E. Hughes-Jones, C. Dallapiccola, J. P. Martin, P. Schenk, S. De Jong, U. Müller, T. J. McMahon, Guenter Duckeck, Richard Nisius, D. Axen, O. Schaile, A. J. Martin, K. Sachs, I. J. Bloodworth, Shlomo Dado, R. K. Carnegie, M. Herndon, A. Jawahery, H. Przysiezniak, Marco Cuffiani, E. do Couto e Silva, A. N. Bell, N. Altekamp, Peter Sherwood, K. Ametewee, Sven Menke, Yoram Rozen, R. J. Barlow, H. Mes, I. P. Duerdoth, Gideon Alexander, Alexander Wagner, G. G. Hanson, D. J. Miller, M. Foucher, Paolo Capiluppi, C. K. Hargrove, Tara Shears, J. Ludwig, P. Fath, K. Runge, P. Bock, C. Sbarra, P. A. Hart, Ehud Duchovni, J. Lauber, G. Giacomelli, Otmar Biebel, D. Karlen, M. J. Pearce, M. Jimack, M. S. Dixit, Frans Meijers, A. Michelini, B. Stockhausen, Paul Kyberd, F. K. Loebinger, W. J. McDonald, Daniel Lellouch, S. M. Gascon-Shotkin, B. C. Shen, D. Rigby, R. J. Hemingway, Giora Mikenberg, J. Steuerer, Satoshi Tanaka, T. Kobayashi, Takehiko Mori, Matthias Schröder, Joleen Pater, Siegfried Bethke, A. K. Honma, B. Nijjhar, V. Zacek, W. G. Scott, M. Thiergen, H. Lafoux, S. D. Talbot, I. Nakamura, R. Giacomelli, B. W. Kennedy, M. Schumacher, E. Lefebvre, P. Jovanovic, James Pinfold, D. Eatough, S. B. Anderson, S. Braibant, A. D. Schaile, P. Szymanski, Gabriella Pasztor, Matthew Evans, D. Chrisman, G. D. Long, Austin Ball, F. Odorici, Volker Blobel, Peter Krieger, N. K. Watson, W. Mohr, D. G. Fong, C. Lewis, D. Glenzinski, Dezso Horvath, A. M. Rossi, Stefan Schmitt, M. J. Losty, Jean-Arcady Meyer, G. A. Snow, C. P. Ward, John Allison, Stephen Lloyd, T. Tsukamoto, P. M. Watkins, Manuella Vincter, A. Posthaus, Alessandro Montanari, S. Söldner-Rembold, J. Gascon, T. J. Smith, Stan Bentvelsen, P. Gagnon, P. Mättig, R. W. Springer, W. Matthews, Shoji Asai, Norbert Wermes, Sherry Towers, T. Kawamoto, R. G. Kellogg, M. A. Thomson, E. K. U. Gross, M. Steiert, A. Sittler, Csaba Hajdu, A. Gaidot, Georges Azuelos, M. Sproston, P. Poffenberger, A. S. Turcot, Stefano Marcellini, S. Orito, E. Tsur, H. M. Bosch, F. Fiedler, M. Verzocchi, Silvia Arcelli, K. W. Bell, J. Pálinkás, M. Rosvick, J. C. Hill, J. W. Gary, Misao Sasaki, N. I. Geddes, Michael Hildreth, D. S. Koetke, M. Hapke, Marcello Mannelli, E. A. Mckigney, D. E. Hutchcroft, P. Schütz, M. Kolrep, N. L. Rodning, W. P. Lai, D. L. Rees, B. Poli, M. J. Oreglia, F. Scharf, German Martinez, J. M. Roney, H. M. Fischer, J. R. Carter, G. N. Patrick, S. A. Robins, Stefan Kluth, P. O. Estabrooks, Shlomit Tarem, A. I. McNab, J. Goldberg, B. Nellen, H. G. Evans, S. W. O'Neale, M. J. Goodrick, I. Cohen, Gunter Wolf, K. Ackerstaff, K. J. Anderson, C. Y. Chang, P. Taras, Michael Kobel, Julie Kirk, K. Stephens, V. Gibson, T. R. Junk, I. Trigger, D. R. Ward, T. Kress, U. Ruppel, M. R. Ingram, S. Robertson, Gregor Herten, B. Wilkens, P. S. Wells, J. E. Pilcher, N. J. Oldershaw, Terry Richard Wyatt, J. E. Bloomer, G. W. Wilson, M. Hauschild, S. A. Wotton, C. Markus, G. T. Jones, E. H. Vokurka, M. Fanti, D. M. Strom, M. Boutemeur, F. S. Merritt, Robert McPherson, R. Rylko, Mathieu Doucet, R. D. Heuer, J. Bechtluft, J. A. McKenna, Fabrizio Fabbri, M. Bobinski, J. A. Wilson, A. Macpherson, R. Bartoldus, P. Scharff-Hansen, R. Van Kooten, Richard Keeler, H. O. Ogren, Christoph Geich-Gimbel, D. Lazic, J. E. Conboy, A. Fürtjes, R. Howard, A. M. Smith, J. S. White, J. Grunhaus, G. Vasseur, F. Wäckerle, Andris Skuja, D. M. Gingrich, Sachio Komamiya, S. Petzold, Theodoros Geralis, E. Ros, Tetsuro Mashimo, P. Berlich, T. P. Kokott, K. Nagai, D. R. Rust, W. Gorn, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. Zer-Zion, P. Routenburg, A. M. Lee, and E. von Törne
Subjects: Quark, Physics, Density matrix, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, D-STAR, Polarization (waves), Helicity, Nuclear physics, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: Measurements of helicity density matrix elements have been made for the φ(1020), D*± and B* vector mesons in multihadronic Z0 decays in the OPAL experiment at LEP. Results for inclusive φ produced with high energy show evidence for production preferentially in the helicity zero state, with ρ00 = 0.54 ± 0.08, compared to the value of 1/3 expected for no spin alignment. The corresponding element for the D*± has a value of 0.40 ± 0.02, also suggesting a deviation from 1/3. The B* result, with ρ00 = 0.36 ± 0.09, is consistent with no spin alignment. Off-diagonal elements have been measured for the f and D* mesons; for the D* the element Re ρ1−1 is non-zero, indicating non-independent fragmentation of the primary quarks.
Published: 1997
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16. A measurement of |Vcb| using decays

Author: A. I. McNab, A. S. Turcot, J. Goldberg, F. Fiedler, S. Yamashita, B. Nellen, P. Igo-Kemenes, Gideon Bella, H. J. Burckhart, K. Ishii, Jacqueline Batley, H. Jeremie, R. E. Hughes-Jones, M. Kolrep, K. Sachs, Shlomo Dado, M. F. Turner-Watson, M. Morii, H. G. Evans, P. Schenk, P. E.L. Clarke, M. K. Jones, Peter R Hobson, O. Schaile, M. Hapke, Achim Stahl, G. Azuelos, M. J. Goodrick, I. Cohen, J. P. Martin, S. De Jong, E. do Couto e Silva, P. Routenburg, R. Van Kooten, H. Przysiezniak, Sachio Komamiya, T. Omori, D. E. Hutchcroft, O. C. Cooke, A. N. Bell, Theodoros Geralis, E. Ros, A. T. Watson, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, G. G. Hanson, G. Giacomelli, Reda Tafirout, Klaus Kurt Desch, Giora Mikenberg, M. S. Dixit, Frans Meijers, Sven Menke, C. Y. Chang, P. G. Estabrooks, C. R. Jones, M. J. Oreglia, T. P. Kokott, A. Rooke, J. G. Layter, J. von Krogh, W. Matthews, P. S. Wells, P. Taras, Michael Kobel, Gunter Wolf, F. X. Gentit, A. J. Martin, R. K. Keeler, F. Wäckerle, Ekg Sarkisyan, P. W. Jeffreys, R. J. Hawkings, K. Ackerstaff, Terry Richard Wyatt, D. M. Gingrich, H. Mes, M. A. Thomson, J. E. Bloomer, M. Boutemeur, Ehud Duchovni, D. Rigby, R. J. Hemingway, S. Braibant, J. E.G. Edward, Julie Kirk, H. M. Fischer, T. Behnke, Guenter Duckeck, M. Jimack, P. Fath, L. A. del Pozo, C. Sbarra, U. Ruppel, M. R. Ingram, Matthias Schröder, A. D. Schaile, Gabriella Pasztor, P. Berlich, W. R. Gibson, P. M. Watkins, Paolo Giacomelli, M. Thiergen, E. K. U. Gross, J. R. Carter, J. Grunhaus, G. Yekutieli, G. N. Patrick, J. Bechtluft, A. Michelini, J. A. McKenna, Dave Charlton, B. T. Bouwens, M. Hansroul, P. Poffenberger, M. Gruwé, C. M. Hawkes, A. A. Carter, J. J. Ward, B. Stockhausen, Paul Kyberd, P. Vikas, S. B. Anderson, G. A. Snow, C. P. Ward, F. K. Loebinger, P. Szymanski, Ron Folman, Roger Jones, B. W. Kennedy, P. Jovanovic, R. M. Brown, Lorne Levinson, Otmar Biebel, Satoshi Tanaka, T. Kobayashi, C. Burgard, D. Lanske, P. Schütz, R. J. Homer, I. J. Bloodworth, R. Bartoldus, S. Söldner-Rembold, B. J. King, H. O. Ogren, P. Utzat, Christoph Geich-Gimbel, R. Bürgin, Richard Nisius, A. Gaidot, A. Skillman, Austin Ball, J. Steuerer, F. S. Merritt, D. M. Strom, T. J. McMahon, Stan Bentvelsen, Peter Krieger, M. S. Proston, Marco Cuffiani, LP Duerdoth, Stefan Kluth, C. Hartmann, D. E. Plane, Shlomit Tarem, R. K. Carnegie, M. Schumacher, Joleen Pater, E. Lefebvre, S. Robertson, P. Pfeifenschneider, Stephen Hillier, Gregor Herten, U. Müller, Silvia Arcelli, J. Letts, M. Herndon, G. M. Dallavalle, S. A. Robins, J. E. Conboy, A. Fürtjes, M. Bobinski, J. A. Wilson, R. Rylko, J. Patt, F. Odorici, Manuella Vincter, Norbert Wermes, Alessandro Montanari, Sherry Towers, N. K. Watson, B. Wilkens, K. Ametewee, T. Kawamoto, R. Giacomelli, Robert McPherson, M. Fierro, S. W. O'Neale, A. Biguzzi, Gideon Alexander, K. J. Anderson, Paolo Capiluppi, D. Lazic, S. Orito, S. R. Lautenschlager, H. A. Neal, U. Jost, R. Mir, E. A. Mckigney, M. Rosvick, Yoram Rozen, J. E. Pilcher, Mathieu Doucet, C. K. Hargrove, R. D. Heuer, M. Foucher, D. Chrisman, Tara Shears, Claire Shepherd-Themistocleous, T. Hilse, W. P. Lai, O. Runolfsson, W. Mohr, N. J. Oldershaw, Volker Blobel, Fabrizio Fabbri, P. A. Hart, T. J. Smith, A. Posthaus, K. Stephens, J. M. Roney, C. Beeston, Stephen Lloyd, M. J. Pearce, R. Howard, J. S. White, Claudio Grandi, K. Nagai, F. G. Oakham, B. Schmitt, E. L. Barberio, D. R. Rust, V. Gibson, C. Dallapiccola, D. Karlen, D. L. Rees, T. R. Junk, N. Altekamp, A. Joly, I. Trigger, R. J. Barlow, D. R. Ward, H. Lafoux, D. J. Miller, T. Kress, F. Scharf, German Martinez, A. K. Honma, Daniel Lellouch, G. W. Wilson, M. Hauschild, A. M. Lee, S. A. Wotton, Takehiko Mori, C. Markus, E. von Törne, G. T. Jones, E. H. Vokurka, V. Zacek, R. Lahmann, John Allison, D. C. Imrie, Stefan Schmitt, N. I. Geddes, Michael Hildreth, R. G. Kellogg, M. Steiert, P. Mättig, Shoji Asai, Csaba Hajdu, G. P. Siroli, Stefano Marcellini, N. L. Rodning, B. Poli, S. M. Gascon-Shotkin, Kiyotomo Kawagoe, Matthew Evans, A. M. Rossi, T. Tsukamoto, P. Scharff-Hansen, A. M. Smith, D. Axen, A. Jawahery, G. Vasseur, Peter Sherwood, Andris Skuja, Alexander Wagner, S. Petzold, J. Ludwig, G. D. Long, K. Runge, P. Bock, Tetsuro Mashimo, J. Lauber, W. Gorn, F. Strumia, S. D. Talbot, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, W. J. McDonald, A. Malik, B. C. Shen, J. W. Gary, D. S. Koetke, Marcello Mannelli, P. Gagnon, A. Sittler, Siegfried Bethke, B. Nijjhar, W. G. Scott, I. Nakamura, H. M. Bosch, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, R. W. Springer, E. Tsur, M. Verzocchi, K. W. Bell, J. Pálinkás, J. C. Hill, and Misao Sasaki
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Form factor (quantum field theory), Electron, Rest frame, Nuclear physics, Recoil, High Energy Physics::Experiment, Nuclear Experiment
Abstract: We report a measurement of the Cabibbo-Kobayashi-Maskawa matrix element |Vcb|. From approximately 4.2 million hadronic Z0 decays recorded with the OPAL deteector, a sample is selected containing 1251 ± 125 B 0 → D ∗+ l − ν l candidates, where l is either an electron or a muon. Using Heavy Quark Effective Theory calculations for the decay form factor at zero recoil of the D∗+ meson in the B 0 rest frame, we derive |Vcb| = [36.0 ± 2.1 (stat) ± 2.4 (syst) ± 1.2 (theory)] × 10−3.
Published: 1997
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17. An improved measurement of $R_b$ using a double tagging method

Author: S. Yamashita, P. Igo-Kemenes, Richard Keeler, D. M. Strom, R. Howard, R. Rylko, K. Ishii, H. Jeremie, R. E. Hughes-Jones, C. Dallapiccola, Takehiko Mori, M. Hapke, H. Mes, I. P. Duerdoth, P. S. Wells, A. Biguzzi, Terry Richard Wyatt, J. E. Bloomer, V. Zacek, D. E. Hutchcroft, P. Fath, O. Schaile, Silvia Arcelli, Claire Shepherd-Themistocleous, E. do Couto e Silva, Dave Charlton, B. Stockhausen, Paul Kyberd, F. K. Loebinger, K. Sachs, Shlomo Dado, Robert McPherson, N. Altekamp, J. Steuerer, Sven Menke, R. Bürgin, Mathieu Doucet, E. A. Mckigney, Joleen Pater, Stefan Schmitt, R. D. Heuer, R. J. Barlow, A. S. Turcot, M. J. Oreglia, R. Giacomelli, T. J. Smith, Stefan Kluth, Fabrizio Fabbri, W. P. Lai, F. Fiedler, Shlomit Tarem, Giora Mikenberg, D. J. Miller, T. Behnke, P. Mättig, Shoji Asai, J. Grunhaus, J. M. Roney, K. Nagai, I. J. Bloodworth, S. Braibant, John Allison, A. D. Schaile, T. Kawamoto, Gabriella Pasztor, Gideon Bella, D. R. Rust, Kiyotomo Kawagoe, H. J. Burckhart, P. Gagnon, M. Schumacher, E. Lefebvre, M. Gruwé, Andris Skuja, M. Kolrep, Jacqueline Batley, J. R. Carter, G. N. Patrick, S. Petzold, P. Schenk, C. M. Hawkes, K. Ackerstaff, G. D. Long, K. Stephens, R. G. Kellogg, Yoram Rozen, M. Steiert, F. Odorici, G. A. Snow, C. P. Ward, Tetsuro Mashimo, Otmar Biebel, Csaba Hajdu, T. Omori, A. Sittler, P. G. Estabrooks, A. M. Lee, Richard Nisius, P. Poffenberger, Stefano Marcellini, M. Foucher, S. B. Anderson, S. Söldner-Rembold, P. Szymanski, E. von Törne, S. Robertson, V. Gibson, P. M. Watkins, H. M. Bosch, C. R. Jones, Marco Cuffiani, D. Karlen, Gregor Herten, W. Gorn, D. Rigby, R. J. Hemingway, A. Joly, G. W. Wilson, J. Letts, Stan Bentvelsen, U. Müller, Norbert Wermes, T. R. Junk, A. J. Martin, Sherry Towers, A. I. McNab, P. Schütz, J. Goldberg, D. Axen, I. Trigger, R. Van Kooten, A. Jawahery, Hans-Christian Schultz-Coulon, B. Nellen, Randall Sobie, Michael Schulz, G. D. Lafferty, M. F. Turner-Watson, S. Orito, B. Wilkens, D. R. Ward, T. Kress, M. Morii, B. W. Kennedy, James Pinfold, M. Rosvick, Achim Stahl, Peter R Hobson, P. Jovanovic, U. Ruppel, Peter Sherwood, R. Lahmann, M. R. Ingram, D. G. Fong, C. Lewis, P. Routenburg, Alexander Wagner, H. G. Evans, M. J. Goodrick, J. Gascon, C. K. Hargrove, Guenter Duckeck, Sachio Komamiya, Theodoros Geralis, E. Ros, J. E. Pilcher, Austin Ball, J. Ludwig, K. Runge, I. Cohen, P. Bock, G. P. Siroli, Matthias Schröder, N. I. Geddes, J. Lauber, N. J. Oldershaw, Peter Krieger, Michael Hildreth, M. Thiergen, H. Lafoux, T. P. Kokott, J. W. Gary, D. S. Koetke, E. Gross, Marcello Mannelli, D. Lellouch, N. L. Rodning, F. Strumia, S. D. Talbot, F. Wäckerle, B. Poli, Manuella Vincter, D. M. Gingrich, P. Scharff-Hansen, Alessandro Montanari, Tara Shears, P. A. Hart, A. M. Smith, S. M. Gascon-Shotkin, U. Jost, P. Berlich, R. Mir, G. Vasseur, M. J. Pearce, Matthew Evans, A. M. Rossi, M. Hauschild, T. Tsukamoto, Paolo Giacomelli, S. W. O'Neale, M. Hansroul, K. J. Anderson, S. A. Wotton, C. Markus, H. M. Fischer, G. T. Jones, E. H. Vokurka, C. Y. Chang, F. G. Oakham, B. Schmitt, S. A. Robins, C. Burgard, E. L. Barberio, R. J. Homer, P. Taras, Michael Kobel, P. Pfeifenschneider, Julie Kirk, J. Patt, F. S. Merritt, J. Bechtluft, J. A. McKenna, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, J. E. Conboy, N. K. Watson, F. X. Gentit, A. Fürtjes, W. Mohr, W. J. McDonald, B. C. Shen, Siegfried Bethke, A. K. Honma, B. Nijjhar, A. Posthaus, W. G. Scott, I. Nakamura, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, R. W. Springer, D. L. Rees, Georges Azuelos, E. Tsur, M. Verzocchi, K. W. Bell, J. Pálinkás, J. C. Hill, Misao Sasaki, F. Scharf, German Martinez, W. Matthews, M. A. Thomson, A. Gaidot, M. Sproston, C. Sbarra, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, T. J. McMahon, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, D. Lazic, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, Ehud Duchovni, M. Jimack, A. Michelini, D. C. Imrie, Satoshi Tanaka, J. S. White, M. Boutemeur, T. Kobayashi, M. Fierro, J. E.G. Edwards, S. R. Lautenschlager, H. A. Neal, T. Hilse, O. Runolfsson, D. Chrisman, Volker Blobel, C. Beeston, Claudio Grandi, Stephen Lloyd, Ekg Sarkisyan, P. W. Jeffreys, Robert M Brown, K. Ametewee, Gideon Alexander, Paolo Capiluppi, J. J. Ward, P. Vikas, D. Lanske, W. R. Gibson, B. T. Bouwens, Lorne Levinson, A. Skillman, Abish Malik, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Alan Watson, G. G. Hanson, Reda Tafirout, Klaus Kurt Desch, G. Wolf, G. Giacomelli, M. S. Dixit, Frans Meijers, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, H. Przysiezniak, A. N. Bell, A. Rooke, and J. G. Layter
Subjects: Nuclear physics, Physics, Top quark, Particle physics, Physics and Astronomy (miscellaneous), Meson, Bottom quark, Particle Physics - Experiment
Published: 1997
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18. Measurement of the triple gauge boson coupling αW from W+W− production in e+e− collisions at =161GeV

Author: S. A. Robins, J. R. Carter, Michael Hildreth, R. Bartoldus, N. L. Rodning, B. Poli, K. Nagai, N. K. Watson, Otmar Biebel, Shigenori Tanaka, S. M. Gascon-Shotkin, U. Müller, P. Igo-Kemenes, S. R. Lautenschlager, H. A. Neal, D. R. Rust, Matthew Evans, A. M. Rossi, T. Tsukamoto, H. O. Ogren, Christoph Geich-Gimbel, A. J. Martin, K. Ishii, H. Jeremie, T. Hilse, R. E. Hughes-Jones, M. Schumacher, E. Lefebvre, T. Behnke, O. C. Cooke, V. Gibson, A. Biguzzi, O. Runolfsson, Gideon Bella, A. M. Lee, H. J. Burckhart, E. von Törne, Jacqueline Batley, J. Letts, James Pinfold, W. Matthews, U. Ruppel, M. R. Ingram, D. G. Fong, C. Lewis, O. Schaile, F. Odorici, E. do Couto e Silva, S. Robertson, S. L. Lloyd, P. Schütz, P. Gagnon, A. Rooke, J. G. Layter, J. E. Conboy, A. Fürtjes, Gregor Herten, J. Allison, C. K. Hargrove, C. Hartmann, K. Ametewee, J. Gascon, D. E. Plane, A. Macchiolo, Sven Menke, Matthias Schröder, A. Sittler, B. Wilkens, T. Omori, Gideon Alexander, M. Sasaki, J. Palinkas, Norbert Wermes, Sherry Towers, Paolo Capiluppi, M. A. Thomson, Claudio Grandi, M. Thiergen, K. Sachs, M. Boutemeur, F. S. Merritt, T. Kawamoto, V. Zacek, R. Van Kooten, J. A. McKenna, Stephen Hillier, J. E. Pilcher, Shlomo Dado, C. R. Jones, G. M. Dallavalle, Ekg Sarkisyan, Richard Nisius, P. W. Jeffreys, J. Bechtluft, S. Orito, H. M. Bosch, M. Rosvick, S. W. O'Neale, J. von Krogh, D. S. Koetke, G. W. Wilson, T. Kobayashi, Marcello Mannelli, G. G. Hanson, H. Mes, M. Hauschild, R. G. Kellogg, M. Steiert, I. P. Duerdoth, R. W.L. Jones, S. A. Wotton, Marco Cuffiani, P. Fath, D. Chrisman, G. D. Long, E. K. U. Gross, Kiyotomo Kawagoe, C. Markus, D. M. Strom, C.J. Beeston, Csaba Hajdu, G. Giacomelli, J. Lauber, Volker Blobel, M. Hapke, Dave Charlton, K. J. Anderson, T. G. Shears, Stefano Marcellini, P. Scharff-Hansen, G. T. Jones, E. H. Vokurka, P. A. Hart, G. Mikenberg, T. J. Smith, N. J. Oldershaw, B. Nijjhar, M. J. Pearce, F. Wäckerle, Joleen Pater, M. Sproston, Claire Shepherd-Themistocleous, K. Stephens, L. A. del Pozo, C. Y. Chang, D. M. Gingrich, B. Stockhausen, Paul Kyberd, F. K. Loebinger, A. M. Smith, M. S. Dixit, Frans Meijers, R. Bürgin, M. J. Oreglia, W. R. Gibson, P. Taras, Michael Kobel, J. Steuerer, J. J. Ward, S. D. Talbot, Ehud Duchovni, R. Rylko, P. E.L. Clarke, M. K. Jones, P. Vikas, S. Braibant, A. D. Schaile, A. A. Faust, B. T. Bouwens, M. Jimack, P. Berlich, P. Poffenberger, M. Fanti, Andris Skuja, J. P. Martin, Gabriella Pasztor, R. Giacomelli, R. Lahmann, Julie Kirk, D. Lanske, A. Michelini, Gunter Wolf, K. Ackerstaff, Satoru Yamashita, S. Petzold, D. Eatough, S. De Jong, G. Yekutieli, Tetsuro Mashimo, G. N. Patrick, D. C. Imrie, R. M. Brown, Lorne Levinson, T. R. Junk, H. Przysiezniak, G. A. Snow, C. P. Ward, A. A. Carter, Ron Folman, Robert McPherson, G. P. Siroli, A. N. Bell, I. Trigger, A. Skillman, A. Joly, Mathieu Doucet, S. Söldner-Rembold, W. Gorn, S. D. Bird, R. D. Heuer, N. I. Geddes, P. Schenk, C. Sbarra, P. S. Wells, Fabrizio Fabbri, D. R. Ward, T. Kress, D. L. Rees, P. Utzat, A. T. Watson, Reda Tafirout, Klaus Kurt Desch, J. E. Bloomer, F. Scharf, German Martinez, D. Axen, A. I. McNab, A. Macpherson, J. Goldberg, A. Jawahery, T. R. Wyatt, T. J. McMahon, J. M. Roney, R. J. Sobie, B. Nellen, R. K. Carnegie, M. Herndon, R. Howard, M. Bobinski, R. J. Barlow, J. A. Wilson, J. S. White, W. Mohr, Peter Sherwood, A. Posthaus, D. Lazic, Alexander Wagner, M. Fierro, J. E.G. Edwards, J. Ludwig, K. Runge, P. Bock, H. G. Evans, M. J. Goodrick, I. Cohen, Stefan Kluth, Shlomit Tarem, R. W. Springer, Achim Stahl, Daniel Lellouch, Paolo Giacomelli, M. Hansroul, C. Burgard, Takehiko Mori, R. J. Homer, Georges Azuelos, E. Tsur, C. M. Hawkes, P. Pfeifenschneider, J. Patt, M. Verzocchi, K. W. Bell, J. C. Hill, B. C. Shen, Siegfried Bethke, A. K. Honma, W. G. Scott, I. Nakamura, J. W. Gary, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Sachio Komamiya, Stefan Schmitt, Theodoros Geralis, M. Gruwe, E. Ros, U. Jost, R. Mir, T. P. Kokott, R. Hawkings, W.J. McDonald, P. Mättig, Shoji Asai, J. Grunhaus, I. J. Bloodworth, S. B. Anderson, P. Szymanski, Stan Bentvelsen, F. G. Oakham, Hans-Christian Schultz-Coulon, B. Schmitt, E. L. Barberio, Michael Schulz, Yoram Rozen, G. Duckeck, M. Foucher, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. Zer-Zion, P. Routenburg, D. Karlen, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, A. S. Turcot, F. Fiedler, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, M. Kolrep, D. E. Hutchcroft, C. Dallapiccola, N. Altekamp, D. J. Miller, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, Silvia Arcelli, E. A. Mckigney, W. P. Lai, G. D. Lafferty, and H. M. Fischer
Subjects: Semileptonic decay, Coupling, Physics, Nuclear and High Energy Physics, Particle physics, Gauge boson, Luminosity (scattering theory), Electron–positron annihilation, law.invention, Standard Model, Nuclear physics, Coupling parameter, law, High Energy Physics::Experiment, Collider
Abstract: This letter describes a measurement of one of the anomalous triple gauge boson couplings using the first data recorded by the OPAL detector at LEP2. A total of 28 W-pair candidates have been selected for an integrated luminosity of 9.89+/-0.06 pb(-1) recorded at a centre-of-mass energy of 161 GeV. We use these data to place constraints upon the coupling parameter alpha(W phi). We analyse the predicted variation of the total cross-section for all observed channels and the distribution of kinematic variables in the semileptonic decay channels. We measure alpha(W phi) to be -0.61(-0.61)(+0.73)+/-0.35, which is consistent with the Standard Model expectation of zero. (C) 1997 Published by Elsevier Science B.V.
Published: 1997
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19. Search for charged scalar leptons using the OPAL detector at GeV

Author: D. Rigby, R. J. Hemingway, V Zacek, B. W. Kennedy, R. Bartoldus, R. Lahmann, D. C. Imrie, G. P. Siroli, John Allison, P. Jovanovic, Austin Ball, J. Grunhaus, Christoph Geich-Gimbel, Peter Krieger, Manuella Vincter, Alessandro Montanari, D. Axen, A. Jawahery, R. G. Kellogg, M. Steiert, Gunter Wolf, Tara Shears, A. Biguzzi, K. Ackerstaff, Peter Sherwood, Alexander Wagner, Csaba Hajdu, K. Sachs, Shlomo Dado, I. J. Bloodworth, J. E. Conboy, A. Fürtjes, J. Ludwig, Claire Shepherd-Themistocleous, H.O Ogren, Stefano Marcellini, S. Robertson, K. Runge, P. Bock, Gregor Herten, Yoram Rozen, M. Foucher, P. A. Hart, Gideon Bella, M. J. Pearce, B. Wilkens, Giora Mikenberg, D. Karlen, H. J. Burckhart, Jacqueline Batley, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, T. Behnke, Daniel Lellouch, S. Braibant, A. D. Schaile, J. E. Pilcher, T. P. Kokott, G. Azuelos, Takehiko Mori, C. Sbarra, T. Omori, Gabriella Pasztor, R. W. Springer, M. Gruwé, C. M. Hawkes, G. A. Snow, C. P. Ward, G. Yekutieli, G. G. Hanson, C. R. Jones, U. Müller, S. Söldner-Rembold, P. Gagnon, Richard Nisius, A. A. Carter, Ron Folman, Roger Jones, A. Sittler, G. Giacomelli, C. Dallapiccola, Stefan Schmitt, A. I. McNab, J. Goldberg, Silvia Arcelli, Marco Cuffiani, H. M. Bosch, B. Nellen, B. J. King, M. Boutemeur, F. S. Merritt, Reda Tafirout, Klaus Kurt Desch, E. Tsur, M. S. Dixit, A. J. Martin, S. W. O'Neale, P. Utzat, Frans Meijers, Dave Charlton, M. Verzocchi, A. S. Turcot, F. Fiedler, J. Lauber, K. J. Anderson, P. Mättig, S Anderson, M. F. Turner-Watson, K. W. Bell, M. Morii, J. Pálinkás, A. Rooke, Peter R Hobson, J. G. Layter, Shoji Asai, P. Routenburg, R. Bürgin, N. Altekamp, F. Strumia, G. W. Wilson, E. A. Mckigney, S. D. Talbot, O. C. Cooke, M. Hauschild, J. C. Hill, S. A. Wotton, P. Poffenberger, W. R. Gibson, Misao Sasaki, H. G. Evans, J. Bechtluft, R. J. Barlow, W. P. Lai, J. A. McKenna, M. J. Goodrick, P. E.L. Clarke, D. J. Miller, C. Markus, M. K. Jones, P. Schütz, B. T. Bouwens, J. P. Martin, I. Cohen, M. Kolrep, S. De Jong, G. T. Jones, E. H. Vokurka, R. M. Brown, Lorne Levinson, A. Joly, J. M. Roney, J. von Krogh, C. K. Hargrove, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, H. Przysiezniak, N. J. Oldershaw, C. Y. Chang, A. N. Bell, M. Hapke, P. Schenk, Paolo Giacomelli, D. E. Hutchcroft, A. Skillman, P. Taras, Michael Kobel, M. Hansroul, B. Stockhausen, Paul Kyberd, F. K. Loebinger, C. Hartmann, D. E. Plane, P. S. Wells, Stephen Hillier, Julie Kirk, J. Steuerer, Joleen Pater, R. J. Hawkings, Guenter Duckeck, C. Burgard, W. J. McDonald, G. M. Dallavalle, B. C. Shen, Terry Richard Wyatt, M. J. Oreglia, R. Giacomelli, L. A. del Pozo, R. J. Homer, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, J. E. Bloomer, I. Nakamura, Andris Skuja, S. Petzold, G. D. Long, Tetsuro Mashimo, D. Glenzinski, Dezso Horvath, M. J. Losty, N. I. Geddes, Michael Hildreth, Jean-Arcady Meyer, U. Jost, R. Mir, Stefan Kluth, J. R. Carter, N. L. Rodning, Shlomit Tarem, B. Poli, G. N. Patrick, W. Gorn, P. Szymanski, Matthias Schröder, F. G. Oakham, B. Schmitt, Otmar Biebel, M. Thiergen, E. L. Barberio, S. M. Gascon-Shotkin, Stan Bentvelsen, P. Pfeifenschneider, R. Howard, J. S. White, J. Patt, Matthew Evans, A. M. Rossi, T. Tsukamoto, J. Letts, H. M. Fischer, D. M. Strom, Norbert Wermes, Sherry Towers, T. Kawamoto, P. Scharff-Hansen, R. Rylko, S. A. Robins, S. Orito, M. Rosvick, A. M. Smith, Achim Stahl, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, J. W. Gary, D. S. Koetke, Marcello Mannelli, Ekg Sarkisyan, P. W. Jeffreys, J. J. Ward, P. Vikas, D. Lanske, S. R. Lautenschlager, H. A. Neal, T. Hilse, T. J. McMahon, O. Runolfsson, R. K. Carnegie, M. Herndon, C. Beeston, U. Ruppel, Claudio Grandi, M. Bobinski, J. A. Wilson, M. R. Ingram, D. Lazic, M. Fierro, J. E.G. Edwards, T. J. Smith, K. Stephens, V. Gibson, T. R. Junk, I. Trigger, D. R. Ward, T. Kress, D. Chrisman, Volker Blobel, Stephen Lloyd, S. Yamashita, P. Igo-Kemenes, Ehud Duchovni, K. Ishii, H. Jeremie, M. Jimack, A. Michelini, R. E. Hughes-Jones, O. Schaile, E. do Couto e Silva, Satoshi Tanaka, T. Kobayashi, Sven Menke, K. Ametewee, Gideon Alexander, Paolo Capiluppi, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, Kiyotomo Kawagoe, D. L. Rees, F. Scharf, German Martinez, N. K. Watson, W. Mohr, A. Posthaus, H. Mes, I. P. Duerdoth, P. Fath, R. Van Kooten, W. Matthews, M. A. Thomson, E. K. U. Gross, M. Sproston, F. Wäckerle, D. M. Gingrich, P. Berlich, M. Schumacher, E. Lefebvre, F. Odorici, K. Nagai, D. R. Rust, A. M. Lee, E. von Törne, Robert McPherson, Mathieu Doucet, R. D. Heuer, and Fabrizio Fabbri
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Missing energy, Muon, High Energy Physics::Phenomenology, Detector, Scalar (physics), Electron, Nuclear physics, Selectron tube, High Energy Physics::Experiment, Minimal Supersymmetric Standard Model, Lepton
Abstract: A search for pair-produced scalar electron, muon and tau leptons has been performed using a data sample corresponding to an integrated luminosity of 10.1 pb−1 at a centre-of-mass energy of s =161 GeV collected with the OPAL detector at LEP. Such events would yield an acoplanar pair of leptons with significant missing energy in the final state. No excess of acoplanar lepton pair events has been observed in the data. Limits are presented on the production cross-sections of charged scalar leptons. Exclusion regions are also presented in the framework of the Minimal Supersymmetric Standard Model. A 95% C.L. lower limit on the right-handed selectron mass of 71.5 GeV is obtained for tan β ≥ 1.5, |μ| ≥ 200 GeV and m χ 1 0 = 12.0 GeV . A 95% C.L. lower limit on the right-handed smuon mass of 51.0 GeV is obtained for m χ 1 0 = 12.0 GeV , independent of tan β and μ.
Published: 1997
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20. Inclusive jet production in photon-photon collisions at $\sqrt s_{\rm ee}=130$ and 136 GeV

Author: G. G. Hanson, G. Giacomelli, T. Behnke, D. M. Strom, M. S. Dixit, Frans Meijers, Silvia Arcelli, R. Rylko, Stefan Schmitt, S. Yamashita, U. Müller, M. Gruwé, C. M. Hawkes, S. R. Lautenschlager, H. A. Neal, P. Igo-Kemenes, K. Ishii, H. Jeremie, P. E.L. Clarke, M. K. Jones, D. Rigby, R. J. Hemingway, W. J. McDonald, B. C. Shen, N. J. Oldershaw, T. J. Smith, P. S. Wells, Terry Richard Wyatt, J. E. Bloomer, R. E. Hughes-Jones, Richard Nisius, J. P. Martin, A. J. Martin, Paolo Giacomelli, M. Hansroul, S. Braibant, A. D. Schaile, Gabriella Pasztor, T. Hilse, O. Runolfsson, B. W. Kennedy, A. I. McNab, S. De Jong, P. Jovanovic, J. Goldberg, O. Schaile, Marco Cuffiani, Dave Charlton, Austin Ball, E. do Couto e Silva, C. Burgard, R. Howard, A. S. Turcot, J. S. White, P. Poffenberger, F. Fiedler, B. Nellen, P. Mättig, O. C. Cooke, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, Peter Krieger, Shoji Asai, M. Hapke, I. Nakamura, R. Bürgin, E. A. Mckigney, H. Przysiezniak, C. K. Hargrove, Sven Menke, R. Bartoldus, C. Beeston, Matthias Schröder, D. E. Hutchcroft, G. A. Snow, C. P. Ward, M. F. Turner-Watson, R. J. Homer, Claudio Grandi, Manuella Vincter, Alessandro Montanari, M. Thiergen, M. Morii, A. N. Bell, Peter R Hobson, M. J. Oreglia, W. P. Lai, I. J. Bloodworth, U. Jost, R. Lahmann, P. Schütz, S. Söldner-Rembold, H. G. Evans, R. Mir, G. W. Wilson, M. Hauschild, D. Glenzinski, D. C. Imrie, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, John Allison, P. Routenburg, Claire Shepherd-Themistocleous, Gideon Bella, H. O. Ogren, S. M. Gascon-Shotkin, M. J. Goodrick, Christoph Geich-Gimbel, I. Cohen, Sachio Komamiya, S. A. Wotton, Theodoros Geralis, C. Markus, E. Ros, A. T. Watson, James Pinfold, H. J. Burckhart, Jacqueline Batley, J. von Krogh, J. R. Carter, H. Mes, A. Rooke, G. T. Jones, J. G. Layter, G. P. Siroli, G. N. Patrick, P. Gagnon, I. P. Duerdoth, J. E. Conboy, Otmar Biebel, T. P. Kokott, E. H. Vokurka, Gunter Wolf, D. G. Fong, C. Lewis, R. W. Springer, K. Ackerstaff, J. M. Roney, M. Kolrep, T. Omori, Yoram Rozen, Tara Shears, R. G. Kellogg, P. Fath, M. Steiert, Csaba Hajdu, F. G. Oakham, R. J. Hawkings, Matthew Evans, A. Sittler, B. Schmitt, E. L. Barberio, A. M. Rossi, Achim Stahl, P. A. Hart, A. Fürtjes, Stefano Marcellini, J. Gascon, C. Y. Chang, M. Foucher, T. Tsukamoto, Georges Azuelos, E. Tsur, C. Dallapiccola, P. Schenk, C. R. Jones, Kiyotomo Kawagoe, M. Verzocchi, K. W. Bell, K. Sachs, S. Robertson, S. B. Anderson, L. A. del Pozo, M. J. Pearce, M. Fierro, J. E.G. Edwards, A. Malik, Gregor Herten, Shlomo Dado, J. Letts, H. M. Bosch, J. Pálinkás, J. Grunhaus, B. Stockhausen, Paul Kyberd, P. Szymanski, F. K. Loebinger, Ekg Sarkisyan, P. W. Jeffreys, T. J. McMahon, J. Steuerer, N. I. Geddes, Norbert Wermes, Sherry Towers, B. Wilkens, P. Taras, T. Kawamoto, P. G. Estabrooks, Michael Hildreth, Michael Kobel, N. Altekamp, Joleen Pater, J. C. Hill, Misao Sasaki, M. Boutemeur, F. S. Merritt, D. Karlen, N. L. Rodning, R. Giacomelli, R. K. Carnegie, S. Orito, M. Rosvick, R. J. Barlow, R. K. Keeler, J. E. Pilcher, B. Poli, M. Herndon, D. Axen, A. Jawahery, D. J. Miller, Julie Kirk, U. Ruppel, M. R. Ingram, J. W. Gary, J. Bechtluft, J. A. McKenna, J. J. Ward, Daniel Lellouch, M. Bobinski, P. Vikas, J. A. Wilson, D. Lanske, A. Joly, Peter Sherwood, H. M. Fischer, P. M. Watkins, Stan Bentvelsen, Takehiko Mori, Giora Mikenberg, Alexander Wagner, D. S. Koetke, M. Schumacher, J. Ludwig, K. Runge, P. Bock, Marcello Mannelli, Stefan Kluth, S. A. Robins, J. Lauber, V. Zacek, E. Lefebvre, Shlomit Tarem, F. X. Gentit, Andris Skuja, S. W. O'Neale, P. Pfeifenschneider, D. Lazic, K. J. Anderson, F. Odorici, F. Strumia, S. D. Talbot, S. Petzold, C. Sbarra, J. Patt, G. D. Long, K. Stephens, Hans-Christian Schultz-Coulon, Tetsuro Mashimo, G. Yekutieli, Randall Sobie, Michael Schulz, G. D. Lafferty, V. Gibson, T. R. Junk, A. A. Carter, Ron Folman, Roger Jones, I. Trigger, W. Gorn, Guenter Duckeck, D. R. Ward, T. Kress, B. J. King, P. Utzat, H. Lafoux, P. Scharff-Hansen, A. M. Smith, G. Vasseur, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, M. Jimack, A. Michelini, Satoshi Tanaka, T. Kobayashi, D. Chrisman, Volker Blobel, Stephen Lloyd, Robert M Brown, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, R. Van Kooten, W. R. Gibson, B. T. Bouwens, F. Wäckerle, D. M. Gingrich, Lorne Levinson, P. Berlich, A. Skillman, K. Nagai, Reda Tafirout, Klaus Kurt Desch, D. R. Rust, A. M. Lee, E. von Törne, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, N. K. Watson, W. Mohr, A. Posthaus, W. Matthews, M. A. Thomson, E. K. U. Gross, A. Gaidot, M. Sproston, D. L. Rees, F. Scharf, and German Martinez
Subjects: Physics, Nuclear physics, Transverse plane, Photon, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Detector, Perturbative QCD, High Energy Physics::Experiment, HERA, Jet (particle physics), Particle Physics - Experiment
Abstract: The inclusive one- and two-jet production cross-sections are measured in collisions of quasi-real photons radiated from the LEP beams at e+e- centre-of-mass energies √see = 130 and 136 GeV using the OPAL detector at LEP. Hard jets are reconstructed using a cone jet finding algorithm. The differential jet cross-sections dσ/dETjet are compared to next-to-leading order perturbative QCD calculations. Transverse energy flows in jets are studied separately for direct and resolved two-photon events. © Springer-Verlag 1997.
Published: 1997
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21. Search for the Standard Model Higgs boson in e+e− collisions at =161

Author: C. Y. Chang, K. W. Bell, P. Taras, Michael Kobel, R. W. Springer, N. K. Watson, Julie Kirk, Reda Tafirout, Klaus Kurt Desch, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, Robert McPherson, E. Tsur, James Pinfold, U. Jost, R. Mir, F. G. Oakham, B. Schmitt, Mathieu Doucet, R. D. Heuer, Ekg Sarkisyan, M. Verzocchi, J. Pálinkás, C. Hartmann, D. E. Plane, W. Mohr, D. G. Fong, C. Lewis, E. L. Barberio, M. Boutemeur, F. S. Merritt, A. Posthaus, J. C. Hill, J. Gascon, Stephen Hillier, G. M. Dallavalle, A. S. Turcot, F. Fiedler, C. Dallapiccola, Fabrizio Fabbri, J. Grunhaus, Kiyotomo Kawagoe, Misao Sasaki, W. J. McDonald, B. C. Shen, Dave Charlton, S. M. Gascon-Shotkin, Otmar Biebel, P. W. Jeffreys, W. Matthews, A. Biguzzi, N. Altekamp, R. J. Barlow, D. J. Miller, T. J. Smith, K. Stephens, G. W. Wilson, M. Hauschild, R. Van Kooten, M. A. Thomson, D. Glenzinskj, Claire Shepherd-Themistocleous, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, I. Nakamura, S. A. Wotton, S. Braibant, A. D. Schaile, Gabriella Pasztor, E. K. U. Gross, R. Bürgin, H. Mes, C. Markus, V. Gibson, M. Sproston, J. W. Gary, D. S. Koetke, J. A. McKenna, A. Rooke, G. T. Jones, T. R. Junk, I. P. Duerdoth, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, Matthew Evans, P. Fath, J. Letts, Dezso Horvath, M. J. Losty, E. H. Vokurka, N. J. Oldershaw, Marcello Mannelli, F. Wäckerle, R. Howard, J. S. White, J. G. Layter, I. Trigger, D. R. Ward, T. Kress, G. A. Snow, S. Yamashita, P. Igo-Kemenes, K. Ishii, C. P. Ward, Norbert Wermes, Sherry Towers, T. Kawamoto, Silvia Arcelli, W. R. Gibson, B. T. Bouwens, A. Joly, A. M. Rossi, T. Tsukamoto, M. Kolrep, Jean-Arcady Meyer, Gideon Bella, H. J. Burckhart, Jacqueline Batley, P. Berlich, S. Orito, M. Rosvick, R. M. Brown, Lorne Levinson, R. Bartoldus, J. J. Ward, P. Vikas, D. Lanske, R. Lahmann, R. E. Hughes-Jones, S. B. Anderson, P. Szymanski, S. W. O'Neale, S. Söldner-Rembold, A. Skillman, G. Azuelos, M. Hapke, P. Pfeifenschneider, K. Nagai, D. C. Imrie, T. Omori, N. I. Geddes, T. Behnke, Michael Hildreth, D. E. Hutchcroft, D. R. Rust, P. Scharff-Hansen, H. O. Ogren, Christoph Geich-Gimbel, D. M. Strom, N. L. Rodning, O. Schaile, C. R. Jones, D. L. Rees, G. P. Siroli, B. Poli, M. J. Oreglia, T. P. Kokott, E. do Couto e Silva, A. M. Lee, R. Rylko, M. F. Turner-Watson, M. Morii, Stan Bentvelsen, F. Scharf, E. von Törne, J. Patt, German Martinez, A. M. Smith, M. Gruwé, C. M. Hawkes, Sven Menke, H. M. Fischer, Peter R Hobson, M. Fierro, J. E.G. Edwards, K. Sachs, Paul Kyberd, F. K. Loebinger, P. Routenburg, D. Chrisman, Andris Skuja, J. E. Conboy, Shlomo Dado, J. Steuerer, E. A. Mckigney, J. R. Carter, A. Fürtjes, Hans-Christian Schultz-Coulon, G. N. Patrick, S. Petzold, Matthias Schröder, U. Ruppel, M. R. Ingram, Randall Sobie, Michael Schulz, G. D. Lafferty, G. D. Long, Tetsuro Mashimo, Volker Blobel, Joleen Pater, S. Robertson, S. R. Lautenschlager, H. A. Neal, Gregor Herten, W. P. Lai, M. Thiergen, G. G. Hanson, R. Giacomelli, Richard Nisius, KJ Anderson, T. Hilse, S. A. Robins, W. Gorn, B. Wilkens, O. Runolfsson, J. Lauber, Paolo Giacomelli, P. S. Wells, Marco Cuffiani, M. Hansroul, Giora Mikenberg, John Allison, G. Giacomelli, J. M. Roney, Guenter Duckeck, Terry Richard Wyatt, C. Beeston, B. Stockhausen, Claudio Grandi, C. Burgard, J. E. Bloomer, D. M. Gingrich, J. E. Pilcher, R. G. Kellogg, M. Steiert, Gunter Wolf, Stephen Lloyd, R. J. Homer, Csaba Hajdu, P. Schenk, K. Ackerstaff, Stefano Marcellini, Stefan Schmitt, M. S. Dixit, Frans Meijers, P. G. Estabrooks, R. K. Keeler, Achim Stahl, P. E.L. Clarke, M. K. Jones, P. M. Watkins, J. P. Martin, O. C. Cooke, F. Strumia, S. D. Talbot, U. Müller, S. De Jong, A. J. Martin, P. Mättig, P. Poffenberger, Shoji Asai, J. von Krogh, H. Przysiezniak, P. Schütz, J. Bechtluft, I. J. Bloodworth, K. Ametewee, A. N. Bell, R. J. Hawkings, Gideon Alexander, Paolo Capiluppi, A. I. McNab, M. Schumacher, H. Jeremie, P. Gagnon, Yoram Rozen, E. Lefebvre, L. A. del Pozo, M. Foucher, Ehud Duchovni, J. Goldberg, F. Odorici, C. K. Hargrove, C. Sbarra, Tara Shears, A. Sittler, M. Jimack, D. Karlen, P. A. Hart, B. Nellen, A. Michelini, M. J. Pearce, H. M. Bosch, Satoshi Tanaka, T. Kobayashi, G. Yekutieli, D. Axen, A. Jawahery, A. A. Carter, Daniel Lellouch, H. G. Evans, Peter Sherwood, Ron Folman, Roger Jones, Alexander Wagner, Takehiko Mori, M. J. Goodrick, I. Cohen, J. Ludwig, K. Runge, V. Zacek, P. Bock, B. J. King, P. Utzat, Stefan Kluth, Shlomit Tarem, T. J. McMahon, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, and D. Lazic
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Missing energy, Muon, Luminosity (scattering theory), Electron–positron annihilation, High Energy Physics::Phenomenology, Fermion, Standard Model, Nuclear physics, Higgs boson, High Energy Physics::Experiment, Lepton
Abstract: This letter describes a search for the Standard Model Higgs boson using data from e + e − collisions collected at a centre-of-mass energy of 161 GeV by the OPAL detector at LEP. The ata correspond to an integrated luminosity of 10.0 pb −1 . The search is sensitive to the main final states from the process where the Higgs boson is produced in association with a fermion anti-fermion pair, namely four jets, two jets with missing energy, and two jets produced together with a pair of electrons, muons or tau leptons. Two candidate events are observed, in agreement with Standard Model background expectations. In combination with previous OPAL searches at centre-of-mass energies close to the Z 0 resonance, we derive a lower limit of 65.0 GeV for the mass of the Standard Model Higgs boson, at the 95% confidence level.
Published: 1997
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22. Search for neutral Higgs bosons in ${\rm Z}^0$ decays using the OPAL detector at LEP

Author: Gregor Herten, B. Wilkens, Stefan Kluth, J. E. Pilcher, Shlomit Tarem, O. C. Cooke, K. Sachs, R. W. Springer, G. G. Hanson, G. W. Wilson, M. Hauschild, Shlomo Dado, S. A. Wotton, C. Markus, S. Yamashita, G. T. Jones, E. H. Vokurka, R. Bartoldus, M. Starks, S. L. Chu, Stefan Schmitt, G. Giacomelli, H. O. Ogren, R. Howard, P. Igo-Kemenes, J. S. White, Christoph Geich-Gimbel, P. Schenk, J. von Krogh, Georges Azuelos, E. Tsur, Giora Mikenberg, S. R. Lautenschlager, H. A. Neal, K. Ishii, H. Jeremie, M. S. Dixit, Frans Meijers, P. G. Estabrooks, R. K. Keeler, S. W. O'Neale, R. J. Hawkings, K. J. Anderson, F. X. Gentit, J. E. Conboy, A. Fürtjes, P. Mättig, Shoji Asai, A. Joly, M. Verzocchi, K. W. Bell, Otmar Biebel, H. Mes, T. Hilse, R. E. Hughes-Jones, S. B. Anderson, P. Szymanski, P. M. Watkins, I. P. Duerdoth, D. M. Strom, L. A. del Pozo, C. Y. Chang, O. Runolfsson, J. Pálinkás, J. C. Hill, P. E.L. Clarke, M. K. Jones, P. Fath, S. Braibant, A. D. Schaile, Gabriella Pasztor, T. Behnke, M. Boutemeur, F. S. Merritt, C. Sbarra, R. Rylko, Silvia Arcelli, A. I. McNab, P. Taras, J. Goldberg, Stan Bentvelsen, B. Nellen, J. P. Martin, Michael Kobel, C. Beeston, Misao Sasaki, W. J. McDonald, B. C. Shen, S. De Jong, John Allison, J. Letts, Paolo Giacomelli, G. Yekutieli, M. Gruwé, E. A. Mckigney, C. M. Hawkes, M. Hansroul, J. Bechtluft, Yoram Rozen, Claudio Grandi, Norbert Wermes, Sherry Towers, T. Kawamoto, O. Schaile, G. A. Snow, C. P. Ward, W. P. Lai, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, I. Nakamura, J. A. McKenna, S. Söldner-Rembold, A. A. Carter, Ron Folman, Richard Nisius, J. M. Roney, Roger Jones, A. S. Turcot, H. G. Evans, C. Burgard, Julie Kirk, M. Foucher, H. Przysiezniak, E. do Couto e Silva, A. N. Bell, P. S. Wells, R. G. Kellogg, M. Steiert, S. Orito, R. J. Homer, B. J. King, Marco Cuffiani, P. Utzat, Terry Richard Wyatt, M. Rosvick, M. F. Turner-Watson, J. E. Bloomer, Csaba Hajdu, Stefano Marcellini, D. Karlen, M. J. Goodrick, I. Cohen, M. Hapke, T. J. McMahon, M. Kolrep, J. Lauber, Achim Stahl, A. Rooke, M. Morii, J. G. Layter, Peter R Hobson, Sven Menke, D. E. Hutchcroft, M. Schumacher, E. Lefebvre, P. Poffenberger, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, R. K. Carnegie, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, M. Fierro, C. Charlesworth, J. E.G. Edwards, A. Malik, Ekg Sarkisyan, M. J. Oreglia, B. Stockhausen, Paul Kyberd, F. K. Loebinger, P. Routenburg, J. Steuerer, Daniel Lellouch, Sachio Komamiya, Theodoros Geralis, M. Bobinski, J. A. Wilson, P. W. Jeffreys, Takehiko Mori, P. Schütz, F. Strumia, S. D. Talbot, F. Odorici, Joleen Pater, E. Ros, A. T. Watson, Guenter Duckeck, J. R. Carter, G. N. Patrick, R. Giacomelli, D. Lazic, P. Pfeifenschneider, P. Scharff-Hansen, V. Zacek, J. Patt, J. J. Ward, P. Vikas, T. P. Kokott, D. Lanske, C. Dallapiccola, P. Gagnon, A. M. Smith, G. Vasseur, N. Altekamp, A. Sittler, R. J. Barlow, D. J. Miller, H. M. Bosch, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, D. Rigby, R. J. Hemingway, S. M. Gascon-Shotkin, D. Axen, A. Jawahery, J. W. Gary, D. S. Koetke, B. W. Kennedy, Peter Sherwood, P. Jovanovic, Marcello Mannelli, Alexander Wagner, Matthew Evans, Andris Skuja, A. M. Rossi, J. Ludwig, S. Petzold, K. Runge, G. D. Long, P. Bock, Austin Ball, T. Tsukamoto, Peter Krieger, H. M. Fischer, Tetsuro Mashimo, Alessandro Montanari, G. Wolf, S. A. Robins, U. Jost, R. Mir, Dave Charlton, W. Gorn, R. Bürgin, H. Lafoux, Gideon Bella, C. H. Shepherd-Themistocleous, H. J. Burckhart, N. I. Geddes, Michael Hildreth, Jacqueline Batley, N. L. Rodning, T. Omori, B. Poli, F. G. Oakham, B. Schmitt, E. L. Barberio, I. J. Bloodworm, C. R. Jones, R. Lahmann, D. C. Imrie, R. Kowalewski, G. P. Siroli, K. Ametewee, Kiyotomo Kawagoe, Gideon Alexander, Paolo Capiluppi, P. Weber, Ehud Duchovni, M. Jimack, A. Michelini, Satoshi Tanaka, T. Kobayashi, D. Chrisman, Volker Blobel, Stephen Lloyd, T. J. Smith, K. Stephens, V. Gibson, T. R. Junk, D. R. Ward, T. Kress, Matthias Schröder, M. Vincier, U. Ruppel, M. R. Ingram, M. Thiergen, Frank Fiedler, U. Müller, A. J. Martin, C. K. Hargrove, Tara Shears, P. A. Hart, M. J. Pearce, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, K. Nagai, D. R. Rust, A. M. Lee, M. Tecchio, E. von Törne, R. Van Kooten, F. Wäckerle, D. M. Gingrich, P. Berlich, Reda Tafirout, Klaus Kurt Desch, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, W. R. Gibson, B. T. Bouwens, R. M. Brown, Lorne Levinson, A. Skillman, N. K. Watson, W. Mohr, A. Posthaus, D. L. Rees, F. Scharf, German Martinez, W. Matthews, M. A. Thomson, E. K. U. Gross, A. Gaidot, and M. Sproston
Subjects: Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Detector, Higgs boson, Supersymmetry, Particle Physics - Experiment, Lower limit, Boson
Published: 1997
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23. Photonic events with large missing energy in e+e− collisions at

Author: T. P. Kokott, A. Joly, Silvia Arcelli, C. Dallapiccola, C. Sbarra, P. Poffenberger, U. Ruppel, M. R. Ingram, N. Altekamp, E. A. Mckigney, R. J. Barlow, K. Nagai, W. P. Lai, Paolo Giacomelli, M. Hansroul, D. J. Miller, G. Yekutieli, J. Grunhaus, C. Burgard, P. Schütz, U. Jost, R. Mir, Gideon Bella, K. Sachs, J. M. Roney, S. R. Lautenschlager, R. J. Homer, Shlomo Dado, John Allison, R. G. Kellogg, M. Steiert, Csaba Hajdu, Stefano Marcellini, A. A. Carter, H. J. Burckhart, H. A. Neal, Ron Folman, Roger Jones, Jacqueline Batley, Tara Shears, T. Hilse, P. Schenk, M. Hapke, B. Stockhausen, Paul Kyberd, F. K. Loebinger, D. L. Rees, J. Steuerer, F. G. Oakham, B. Schmitt, Joleen Pater, Achim Stahl, O. Runolfsson, R. Giacomelli, G. Azuelos, F. Scharf, T. Omori, D. R. Rust, B. J. King, P. Utzat, P. A. Hart, E. L. Barberio, P. G. Estabrooks, Giora Mikenberg, R. K. Keeler, D. E. Hutchcroft, P. S. Wells, A. Rooke, German Martinez, H. M. Fischer, C. Beeston, Claudio Grandi, W. R. Gibson, J. G. Layter, S. Yamashita, T. J. McMahon, P. Igo-Kemenes, P. M. Watkins, M. J. Oreglia, A. M. Lee, A. S. Turcot, F. Fiedler, M. J. Pearce, G. W. Wilson, C. R. Jones, R. K. Carnegie, K. Ishii, H. Jeremie, W. Matthews, Claire Shepherd-Themistocleous, H. Mes, I. P. Duerdoth, M. Boutemeur, F. S. Merritt, S. W. O'Neale, K. J. Anderson, M. F. Turner-Watson, J. R. Carter, G. N. Patrick, E. von Törne, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, P. Pfeifenschneider, P. Fath, S. Braibant, A. D. Schaile, Gabriella Pasztor, M. Morii, M. Herndon, M. Bobinski, J. A. Wilson, M. Hauschild, S. A. Wotton, C. Markus, R. E. Hughes-Jones, Peter R Hobson, P. Routenburg, O. Schaile, T. J. Smith, K. Stephens, Terry Richard Wyatt, J. E. Bloomer, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, J. Patt, Dave Charlton, Otmar Biebel, J. Bechtluft, M. A. Thomson, S. A. Robins, R. Lahmann, A. Buguzzi, J. A. McKenna, D. C. Imrie, U. Müller, A. J. Martin, G. A. Snow, C. P. Ward, G. T. Jones, E. H. Vokurka, B. T. Bouwens, R. M. Brown, Lorne Levinson, E. do Couto e Silva, D. Lazic, P. E.L. Clarke, M. K. Jones, R. Bürgin, E. K. U. Gross, M. Sproston, S. Söldner-Rembold, M. Fierro, J. E.G. Edwards, D. Chrisman, Sven Menke, J. P. Martin, T. Behnke, V. Gibson, O. C. Cooke, Ekg Sarkisyan, P. W. Jeffreys, N. J. Oldershaw, R. Bartoldus, M. Kolrep, T. R. Junk, S. De Jong, I. Trigger, H. O. Ogren, A. Skillman, Volker Blobel, J. Letts, Christoph Geich-Gimbel, Norbert Wermes, Sherry Towers, M. Gruwé, C. M. Hawkes, D. R. Ward, T. Kress, J. von Krogh, M. Schumacher, T. Kawamoto, C. Hartmann, G. P. Siroli, Hans-Christian Schultz-Coulon, Robert McPherson, D. E. Plane, C. K. Hargrove, Randall Sobie, Michael Schulz, G. D. Lafferty, E. Lefebvre, H. Przysiezniak, N. K. Watson, R. J. Hawkings, S. Orito, M. Rosvick, Mathieu Doucet, Stephen Hillier, Matthias Schröder, L. A. del Pozo, R. D. Heuer, Richard Nisius, Fabrizio Fabbri, G. M. Dallavalle, Stephen Lloyd, F. Odorici, A. N. Bell, J. J. Ward, P. Vikas, M. Thiergen, Marco Cuffiani, J. E. Conboy, A. Fürtjes, N. I. Geddes, Michael Hildreth, D. Lanske, Guenter Duckeck, R. Van Kooten, W. Mohr, D. M. Gingrich, Ehud Duchovni, D. M. Strom, N. L. Rodning, A. Posthaus, S. B. Anderson, Kiyotomo Kawagoe, P. Szymanski, B. Poli, M. Jimack, Stan Bentvelsen, F. Wäckerle, S. Robertson, Gregor Herten, R. Rylko, G. G. Hanson, A. Michelini, B. Wilkens, Reda Tafirout, Klaus Kurt Desch, J. E. Pilcher, Satoshi Tanaka, T. Kobayashi, S. M. Gascon-Shotkin, G. Giacomelli, P. Berlich, Matthew Evans, R. Howard, J. S. White, A. M. Rossi, T. Tsukamoto, M. S. Dixit, Frans Meijers, Andris Skuja, S. Petzold, K. Ametewee, Gideon Alexander, G. D. Long, Paolo Capiluppi, Tetsuro Mashimo, W. Gorn, P. Scharff-Hansen, A. M. Smith, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, J. W. Gary, D. S. Koetke, Marcello Mannelli, R. W. Springer, C. Y. Chang, P. Taras, Michael Kobel, Julie Kirk, E. Tsur, M. Verzocchi, K. W. Bell, J. Pálinkás, J. C. Hill, Misao Sasaki, W. J. McDonald, B. C. Shen, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, I. Nakamura, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, J. Lauber, F. Strumia, S. D. Talbot, P. Gagnon, A. Sittler, D. Glenzinski, H. M. Bosch, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Gunter Wolf, K. Ackerstaff, Stefan Kluth, Shlomit Tarem, A. I. McNab, J. Goldberg, B. Nellen, I. J. Bloodworth, H. G. Evans, M. J. Goodrick, I. Cohen, Yoram Rozen, M. Foucher, D. Karlen, Stefan Schmitt, P. Mättig, Shoji Asai, Daniel Lellouch, Takehiko Mori, V. Zacek, Sachio Komamiya, Theodoros Geralis, E. Ros, and A. T. Watson
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Photon, Luminosity (scattering theory), Missing energy, Branching fraction, Electron–positron annihilation, High Energy Physics::Experiment, Topology (electrical circuits), Supersymmetry, Standard Model
Abstract: Photonic events with large missing energy have been observed with the OPAL detector at LEP using two search topologies. The first topology looks for events with significant missing energy and at least one photon in |cosθ| 0.2. The second topology looks for events with an acoplanar photon pair where both photons are in |cosθ| < 0.7 and have energy exceeding 1.75 GeV. In the data sample corresponding to an integrated luminosity of 10.0 pb−1, 11 events are selected for the first topology and a cross-section of 1.6 ± 0.5 pb is measured within the kinematic acceptance, consistent with that expected for the Standard Model process e+e− → ννγ(γ). No events are selected for the second topology giving a 95% CL cross-section upper limit of 0.41 pb within the kinematic acceptance. Upper limits on the cross-section times branching ratio for new particle production are also derived.
Published: 1997
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24. Measurement of the mass of the W boson in e+e− collisions at =161

Author: J. Grunhaus, Otmar Biebel, S. Braibant, A. D. Schaile, K. Nagai, Ehud Duchovni, M. Jimack, Gabriella Pasztor, D. R. Rust, A. Rooke, A. Michelini, John Allison, Daniel Lellouch, J. Letts, O. C. Cooke, J. G. Layter, G. A. Snow, Takehiko Mori, T. Behnke, K. Ackerstaff, Norbert Wermes, Satoshi Tanaka, T. Kobayashi, A. M. Lee, Sherry Towers, T. Kawamoto, P. Schenk, J. von Krogh, C. P. Ward, R. Lahmann, C. Sbarra, D. C. Imrie, E. von Törne, G. Yekutieli, R. J. Hawkings, Sachio Komamiya, W. Matthews, A. A. Carter, Ron Folman, Roger Jones, R. G. Kellogg, B. J. King, P. Utzat, S. Orito, M. Steiert, S. Söldner-Rembold, V. Zacek, Theodoros Geralis, E. Ros, A. T. Watson, L. A. del Pozo, T. J. McMahon, M. Rosvick, M. A. Thomson, Csaba Hajdu, James Pinfold, M. Gruwé, D. G. Fong, C. Lewis, C. M. Hawkes, P. G. Estabrooks, R. K. Keeler, U. Ruppel, M. R. Ingram, Stefano Marcellini, M. Boutemeur, F. S. Merritt, W. J. McDonald, E. K. U. Gross, N. I. Geddes, Michael Hildreth, J. Gascon, M. Hapke, T. P. Kokott, H. Mes, Richard Nisius, J. Lauber, S. B. Anderson, N. L. Rodning, Gideon Bella, P. Szymanski, G. P. Siroli, P. M. Watkins, M. Sproston, R. Van Kooten, P. E.L. Clarke, D. E. Hutchcroft, Marco Cuffiani, R. K. Carnegie, I. J. Bloodworth, B. C. Shen, M. Herndon, I. P. Duerdoth, M. Bobinski, A. I. McNab, J. Goldberg, J. A. Wilson, H. J. Burckhart, M. K. Jones, B. Poli, J. P. Martin, Jacqueline Batley, M. J. Oreglia, D. Lazic, J. W. Gary, P. Fath, B. Nellen, F. Strumia, S. Yamashita, C. Y. Chang, B. Stockhausen, Paul Kyberd, F. K. Loebinger, S. De Jong, S. D. Talbot, H. M. Fischer, D. S. Koetke, Marcello Mannelli, K. Ametewee, Siegfried Bethke, N. K. Watson, F. Wäckerle, A. K. Honma, J. Steuerer, Paolo Giacomelli, M. Hansroul, K. Sachs, Yoram Rozen, Shlomo Dado, B. Nijjhar, W. G. Scott, J. R. Carter, G. N. Patrick, Silvia Arcelli, P. Taras, Michael Kobel, Gideon Alexander, H. Przysiezniak, T. Omori, Claire Shepherd-Themistocleous, Joleen Pater, P. Igo-Kemenes, J. Bechtluft, H. G. Evans, P. Berlich, Paolo Capiluppi, S. A. Robins, P. Scharff-Hansen, J. A. McKenna, I. Nakamura, M. F. Turner-Watson, Stan Bentvelsen, M. Foucher, R. Giacomelli, M. Morii, Peter R Hobson, K. Ishii, H. Jeremie, P. Routenburg, M. J. Goodrick, I. Cohen, E. A. Mckigney, W. Mohr, Robert McPherson, A. M. Smith, A. N. Bell, M. Schumacher, E. Lefebvre, Giora Mikenberg, A. Posthaus, D. Chrisman, W. P. Lai, Mathieu Doucet, R. D. Heuer, R. E. Hughes-Jones, S. M. Gascon-Shotkin, Volker Blobel, C. Burgard, R. J. Homer, Fabrizio Fabbri, M. Fierro, Andris Skuja, S. Petzold, C. R. Jones, J. E.G. Edwards, D. Glenzinski, Dezso Horvath, M. J. Losty, F. Odorici, G. G. Hanson, G. D. Long, J. M. Roney, Tetsuro Mashimo, D. Karlen, Hans-Christian Schultz-Coulon, Stephen Lloyd, Randall Sobie, Michael Schulz, G. D. Lafferty, S. R. Lautenschlager, Stefan Kluth, Shlomit Tarem, Jean-Arcady Meyer, P. Gagnon, Matthew Evans, H. A. Neal, A. M. Rossi, T. J. Smith, K. Stephens, R. Bartoldus, D. L. Rees, T. Tsukamoto, W. Gorn, A. Joly, G. Giacomelli, F. Scharf, German Martinez, T. Hilse, R. W. Springer, G. W. Wilson, O. Runolfsson, H. O. Ogren, Dave Charlton, P. Pfeifenschneider, V. Gibson, Christoph Geich-Gimbel, Guenter Duckeck, O. Schaile, Stefan Schmitt, T. R. Junk, A. Sittler, C. Beeston, M. Hauschild, R. Bürgin, J. Patt, Claudio Grandi, E. do Couto e Silva, Georges Azuelos, I. Trigger, Ekg Sarkisyan, P. W. Jeffreys, M. S. Dixit, E. Tsur, D. R. Ward, T. Kress, M. Verzocchi, Frans Meijers, K. W. Bell, P. Mättig, J. Pálinkás, Shoji Asai, S. A. Wotton, Kiyotomo Kawagoe, A. S. Turcot, J. J. Ward, F. Fiedler, P. Vikas, J. C. Hill, D. Lanske, Misao Sasaki, Achim Stahl, Sven Menke, H. M. Bosch, M. Kolrep, C. Markus, G. T. Jones, D. Axen, A. Jawahery, J. E. Conboy, A. Fürtjes, E. H. Vokurka, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, N. J. Oldershaw, P. S. Wells, S. Robertson, Gregor Herten, B. Wilkens, J. E. Pilcher, Terry Richard Wyatt, J. E. Bloomer, U. Müller, A. J. Martin, C. K. Hargrove, Tara Shears, P. A. Hart, R. Howard, M. J. Pearce, J. S. White, Reda Tafirout, Klaus Kurt Desch, Matthias Schröder, C. Hartmann, D. E. Plane, Stephen Hillier, M. Thiergen, G. M. Dallavalle, Julie Kirk, W. R. Gibson, D. M. Gingrich, B. T. Bouwens, S. W. O'Neale, K. J. Anderson, R. M. Brown, G. WoIf, Lorne Levinson, P. Poffenberger, A. Skillman, P. Schütz, D. M. Strom, R. Rylko, U. Jost, R. Mir, F. G. Oakham, B. Schmitt, E. L. Barberio, C. Dallapiccola, N. Altekamp, R. J. Barlow, D. J. Miller, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, and Alessandro Montanari
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Pair production, Luminosity (scattering theory), Electron–positron annihilation, Detector, Beam energy, Energy (signal processing), Standard Model
Abstract: This letter describes the first observation of W boson pair production at a centre-of-mass energy s =161 GeV in the OPAL detector at LEP. The analysis is sensitive to all expected W + W − decay channels. A total of 28 events have been selected for an integrated luminosity of 9.89±0.06 pb −1 . This is consistent with the Standard Model expectation, including signal and background contributions. The W pair production cross-section is measured to be σ WW = 3.62 −0.82 +0.93 ±0.16 pb. An analysis of the predicted M W dependence of the accepted cross-section, taking into account interference in the four-fermion production processes, yields M W = 80.40 −0.41−0.10 +0.44+0.09 ±0.10 GeV, where the first and second uncertainties are statistical and systematic, respectively, and the third arises form the beam energy uncertainty.
Published: 1996
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25. Search for chargino and neutralino production in e+e− collisions at = 161

Author: A. Rooke, J. G. Layter, Sachio Komamiya, Theodoros Geralis, I. J. Bloodworth, K. Nagai, E. Ros, A. T. Watson, A. I. McNab, J. Goldberg, Silvia Arcelli, S. R. Lautenschlager, R. Lahmann, D. R. Rust, H. A. Neal, B. Nellen, Otmar Biebel, P. E.L. Clarke, M. K. Jones, J. P. Martin, W. Matthews, S. De Jong, Tara Shears, G. G. Hanson, G. Giacomelli, H. Mes, M. S. Dixit, Frans Meijers, Yoram Rozen, U. Jost, R. Mir, H. Przysiezniak, A. N. Bell, T. Hilse, M. Foucher, M. A. Thomson, T. P. Kokott, I. P. Duerdoth, A. M. Lee, D. M. Strom, P. A. Hart, E. A. Mckigney, H. G. Evans, O. Runolfsson, E. K. U. Gross, Claire Shepherd-Themistocleous, S. Braibant, P. Fath, D. Chrisman, M. J. Goodrick, I. Cohen, E. von Törne, M. Boutemeur, F. S. Merritt, W. P. Lai, R. Rylko, M. Sproston, Volker Blobel, A. D. Schaile, Gabriella Pasztor, D. Karlen, Reda Tafirout, Klaus Kurt Desch, M. J. Pearce, Dave Charlton, J. Letts, F. G. Oakham, C. Beeston, Claudio Grandi, G. P. Siroli, Daniel Lellouch, G. A. Snow, C. P. Ward, Stephen Lloyd, S. Yamashita, B. Schmitt, Stefan Kluth, Norbert Wermes, Sherry Towers, T. Kawamoto, S. W. O'Neale, E. L. Barberio, J. M. Roney, Takehiko Mori, D. C. Imrie, P. Igo-Kemenes, S. Söldner-Rembold, Shlomit Tarem, C. Dallapiccola, J. Bechtluft, K. J. Anderson, R. Bürgin, V. Zacek, P. Scharff-Hansen, N. K. Watson, Robert McPherson, C. Y. Chang, J. A. McKenna, Mathieu Doucet, S. Orito, M. Rosvick, T. Behnke, P. Taras, P. Schenk, K. Ishii, H. Jeremie, R. D. Heuer, Fabrizio Fabbri, U. Müller, Michael Kobel, R. E. Hughes-Jones, N. Altekamp, M. Hapke, Gunter Wolf, P. S. Wells, Terry Richard Wyatt, K. Ackerstaff, R. Van Kooten, A. J. Martin, P. G. Estabrooks, R. K. Keeler, M. Fierro, J. E.G. Edwards, C. Sbarra, R. J. Barlow, A. M. Smith, Stefan Schmitt, Ekg Sarkisyan, P. W. Jeffreys, M. F. Turner-Watson, D. J. Miller, R. Bartoldus, D. E. Hutchcroft, Julie Kirk, J. E. Bloomer, P. Gagnon, Kiyotomo Kawagoe, M. Morii, H. O. Ogren, Gideon Bella, N. J. Oldershaw, W. Mohr, F. Wäckerle, D. M. Gingrich, Christoph Geich-Gimbel, Peter R Hobson, M. Gruwé, G. Yekutieli, M. J. Oreglia, C. K. Hargrove, P. Mättig, J. J. Ward, P. Poffenberger, K. Ametewee, P. Vikas, A. Posthaus, O. Schaile, P. M. Watkins, Shoji Asai, Matthias Schröder, C. M. Hawkes, D. Lanske, Gideon Alexander, C. Hartmann, D. E. Plane, P. Berlich, H. J. Burckhart, A. Sittler, James Pinfold, Paolo Capiluppi, Stephen Hillier, D. Rigby, R. J. Hemingway, R. W. Springer, P. Schütz, M. Thiergen, P. Routenburg, D. G. Fong, C. Lewis, E. do Couto e Silva, A. A. Carter, Ron Folman, Roger Jones, Richard Nisius, J. Gascon, G. M. Dallavalle, J. R. Carter, M. Schumacher, G. N. Patrick, B. W. Kennedy, S. Robertson, Gregor Herten, P. Jovanovic, Jacqueline Batley, B. J. King, E. Lefebvre, P. Utzat, Ehud Duchovni, Marco Cuffiani, B. Wilkens, M. Jimack, D. L. Rees, J. E. Conboy, Austin Ball, A. Fürtjes, J. E. Pilcher, A. Michelini, Peter Krieger, O. C. Cooke, F. Odorici, J. W. Gary, F. Scharf, German Martinez, H. M. Bosch, R. Howard, J. S. White, J. Grunhaus, G. W. Wilson, D. S. Koetke, M. Hauschild, Manuella Vincter, Alessandro Montanari, S. A. Wotton, Satoshi Tanaka, T. Kobayashi, Georges Azuelos, Marcello Mannelli, C. Markus, J. von Krogh, W. R. Gibson, Andris Skuja, E. Tsur, G. T. Jones, Sven Menke, E. H. Vokurka, S. Petzold, G. D. Long, R. J. Hawkings, M. Verzocchi, K. W. Bell, Tetsuro Mashimo, B. T. Bouwens, L. A. del Pozo, J. Pálinkás, A. Joly, H. M. Fischer, T. J. McMahon, T. Omori, D. Axen, J. C. Hill, A. Jawahery, Misao Sasaki, W. J. McDonald, R. K. Carnegie, B. C. Shen, M. Herndon, M. Bobinski, S. A. Robins, W. Gorn, R. M. Brown, Lorne Levinson, J. A. Wilson, T. J. Smith, Siegfried Bethke, K. Stephens, A. K. Honma, B. Nijjhar, W. G. Scott, Peter Sherwood, C. R. Jones, I. Nakamura, D. Lazic, N. I. Geddes, Michael Hildreth, V. Gibson, Alexander Wagner, A. Skillman, N. L. Rodning, B. Poli, J. Ludwig, John Allison, T. R. Junk, K. Runge, P. Bock, I. Trigger, D. R. Ward, T. Kress, J. Lauber, S. M. Gascon-Shotkin, U. Ruppel, M. R. Ingram, D. Glenzinski, Dezso Horvath, Matthew Evans, A. M. Rossi, R. G. Kellogg, T. Tsukamoto, M. Steiert, M. J. Losty, Jean-Arcady Meyer, F. Strumia, S. D. Talbot, Csaba Hajdu, Stefano Marcellini, B. Stockhausen, Paul Kyberd, F. K. Loebinger, J. Steuerer, Joleen Pater, R. Giacomelli, Paolo Giacomelli, M. Hansroul, C. Burgard, R. J. Homer, P. Pfeifenschneider, J. Patt, Achim Stahl, K. Sachs, Shlomo Dado, Giora Mikenberg, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Guenter Duckeck, A. S. Turcot, F. Fiedler, M. Kolrep, S. B. Anderson, P. Szymanski, and Stan Bentvelsen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Astrophysics::High Energy Astrophysical Phenomena, Supergravity, High Energy Physics::Phenomenology, Scalar (mathematics), Supersymmetry, Lower limit, Nuclear physics, Chargino, Neutralino, High Energy Physics::Experiment, Nuclear Experiment, Minimal Supersymmetric Standard Model
Abstract: Charginos and neutralinos, predicted by supersymmetric theories, have been searched for in e+e− collisions with an intergrated luminosity of 10.0 pb−1 at a centre-of-mass energy of s = 161 GeV with the OPAL detector at LEP. Two candidate events are selected; consistent with the total background estimate of 0.7 ± 0.2 events. The 95% C.L. lower limit on the lightest chargino mass in the Minimal Supersymmetric Standard Model is 78.5 GeV if the universal scalar mass m0 is greater than 1 TeV, and 62.0 GeV for the smallest m0 compatible with slepton and sneutrino mass limits obtained at centre-of-mass energies near the Z peak. These limits were obtained under the conditions that the lightest chargino is heavier than the lightest neutralino by more than 10 GeV and tan β = 1.5. The new exclusion limits significantly improve on the results obtained at s = 130 and 136 GeV.
Published: 1996
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26. Test of QCD analytic predictions for the multiplicity ratio between gluon and quark jets

Author: G. W. Wilson, James Pinfold, M. Hauschild, P. Poffenberger, D. G. Fong, C. Lewis, J. Gascon, S. A. Wotton, C. Markus, P. G. Estabrooks, Stefan Schmitt, P. Schütz, W. J. McDonald, B. C. Shen, D. Rigby, R. J. Hemingway, T. J. Smith, P. Gagnon, S. L. Chu, Siegfried Bethke, G. T. Jones, B. W. Kennedy, P. Jovanovic, Ekg Sarkisyan, P. M. Watkins, A. K. Honma, B. Nijjhar, W. G. Scott, Austin Ball, A. Malik, A. Gaidot, A. Sittler, Paolo Giacomelli, M. Hansroul, I. Nakamura, E. H. Vokurka, M. Hapke, P. Mättig, Shoji Asai, Kiyotomo Kawagoe, J. W. Gary, D. S. Koetke, P. Pfeifenschneider, C. Hartmann, D. E. Plane, J. Patt, Peter Krieger, Marcello Mannelli, C. Burgard, Manuella Vincter, D. M. Strom, Matthias Schröder, H. M. Bosch, D. E. Hutchcroft, I. J. Bloodworth, R. J. Homer, P. W. Jeffreys, Stephen Hillier, M. Boutemeur, F. S. Merritt, Alessandro Montanari, Dave Charlton, H. Mes, M. Thiergen, G. G. Hanson, C. Dallapiccola, S. Braibant, A. D. Schaile, D. Glenzinski, Dezso Horvath, J. Lauber, P. Scharff-Hansen, G. M. Dallavalle, M. J. Oreglia, M. J. Losty, Yoram Rozen, Gabriella Pasztor, P. Weber, I. P. Duerdoth, M. Foucher, Jean-Arcady Meyer, Achim Stahl, R. Bürgin, P. Fath, Silvia Arcelli, T. J. McMahon, T. Behnke, Alan Watson, F. Strumia, S. D. Talbot, R. Rylko, P. Schenk, A. M. Smith, Tara Shears, D. Karlen, J. Bechtluft, G. A. Snow, C. P. Ward, G. Giacomelli, Gideon Bella, C. H. Shepherd-Themistocleous, H. J. Burckhart, S. Söldner-Rembold, N. Altekamp, R. J. Barlow, Jacqueline Batley, G. Vasseur, Stefan Kluth, J. R. Carter, Eilam Gross, R. W. Springer, G. N. Patrick, R. K. Carnegie, M. Bobinski, S. Yamashita, J. A. Wilson, Frank Fiedler, S. W. O'Neale, K. J. Anderson, E. A. Mckigney, J. A. McKenna, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, P. Igo-Kemenes, P. A. Hart, Georges Azuelos, U. Ruppel, M. R. Ingram, M. J. Pearce, M. S. Dixit, E. Tsur, W. P. Lai, C. Y. Chang, M. Gruwé, C. M. Hawkes, Shlomit Tarem, Frans Meijers, B. Stockhausen, Paul Kyberd, F. K. Loebinger, S. M. Gascon-Shotkin, Andris Skuja, K. Ishii, H. Jeremie, Otmar Biebel, T. Omori, R. Bartoldus, Reda Tafirout, Klaus Kurt Desch, D. Lazic, Robert McPherson, P. Taras, M. Verzocchi, K. W. Bell, D. Axen, S. Petzold, A. Jawahery, J. J. Ward, U. Jost, R. Mir, Richard Nisius, Gregor Herten, G. D. Long, R. E. Hughes-Jones, P. Vikas, Tetsuro Mashimo, Richard Keeler, J. Steuerer, J. Pálinkás, J. M. Roney, Michael Kobel, Daniel Lellouch, O. C. Cooke, J. C. Hill, C. R. Jones, H. O. Ogren, K. Sachs, R. Kowalewski, Misao Sasaki, D. L. Rees, Shlomo Dado, Takehiko Mori, M. Schumacher, Mathieu Doucet, B. Wilkens, U. Müller, Joleen Pater, O. Schaile, E. Lefebvre, Peter Sherwood, Alexander Wagner, J. Ludwig, Christoph Geich-Gimbel, A. J. Martin, Julie Kirk, J. Letts, V. Zacek, K. Runge, P. Bock, Guenter Duckeck, W. Gorn, R. Giacomelli, D. Lanske, E. do Couto e Silva, Norbert Wermes, Sherry Towers, J. E. Conboy, F. Scharf, R. D. Heuer, Marco Cuffiani, F. Odorici, A. Rooke, J. G. Layter, T. Kawamoto, F. G. Oakham, J. von Krogh, Fabrizio Fabbri, K. Stephens, R. Howard, W. R. Gibson, J. S. White, Giora Mikenberg, K. Ametewee, German Martinez, D. J. Miller, S. Orito, M. Rosvick, B. T. Bouwens, R. J. Hawkings, B. Schmitt, E. L. Barberio, Sven Menke, A. Fürtjes, C. K. Hargrove, C. Charlesworth, Matthew Evans, Gideon Alexander, A. M. Rossi, R. Van Kooten, Paolo Capiluppi, L. A. del Pozo, Gunter Wolf, F. X. Gentit, V. Gibson, Lorne Levinson, S. B. Anderson, C. Sbarra, J. E. Pilcher, P. Szymanski, John Allison, N. K. Watson, T. R. Junk, T. Tsukamoto, A. Skillman, H. M. Fischer, G. Yekutieli, P. S. Wells, M. Fierro, D. R. Ward, H. Lafoux, T. Kress, J. E.G. Edwards, Terry Richard Wyatt, A. A. Carter, Ron Folman, Roger Jones, J. E. Bloomer, S. R. Lautenschlager, H. A. Neal, A. I. McNab, J. Goldberg, Stan Bentvelsen, F. Wäckerle, D. Chrisman, R. G. Kellogg, B. J. King, B. Nellen, T. Hilse, Volker Blobel, P. Utzat, O. Runolfsson, M. Steiert, D. M. Gingrich, H. G. Evans, W. Mohr, S. A. Robins, M. J. Goodrick, A. Posthaus, I. Cohen, Csaba Hajdu, C. Beeston, A. S. Turcot, Claudio Grandi, W. Matthews, P. E.L. Clarke, M. K. Jones, P. Berlich, Stefano Marcellini, K. Nagai, J. P. Martin, M. A. Thomson, D. R. Rust, Stephen Lloyd, M. Sproston, A. M. Lee, M. Kolrep, Robert M Brown, M. Tecchio, E. von Törne, M. Starks, A. Joly, S. De Jong, N. I. Geddes, Michael Hildreth, Ehud Duchovni, M. Jimack, N. L. Rodning, B. Poli, H. Przysiezniak, A. Michelini, A. N. Bell, Satoshi Tanaka, T. Kobayashi, M. F. Turner-Watson, R. Lahmann, M. Morii, D. C. Imrie, Peter R Hobson, P. Routenburg, G. P. Siroli, Sachio Komamiya, Theodoros Geralis, E. Ros, and T. P. Kokott
Subjects: Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, Parton shower, Particle Physics - Experiment
Abstract: Gluon jets with about 39 GeV energy are identified in hadronic Z 0 decays by tagging two jets in the same hemisphere of an event as quark jets. Identifying the gluon jet to be all the particles observed in the hemisphere opposite to that containing the two tagged jets yields an inclusive gluon jet definition corresponding to that used in analytic calculations, allowing the first direct test of those calculations. In particular, this jet definition yields results which are only weakly dependent on a jet finding algorithm. We find r ch. =1.552±0.0041 ( stat ) ±0.061 ( syst. ) for the ratio of the mean charged particle multiplicity in gluon jets to that in light quark uds jets, where the uds jets are identified using an inclusive jet definition similar to that used for the gluon jets. Our result is in general agreement with the prediction of a recent analytic calculation which incorporates energy conservation into the parton shower branching processes, but is considerably smaller than analytic predictions which do not incorporate energy conservation.
Published: 1996
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27. Test of the four-fermion contact interaction in e+e− collisions at 130–140 GeV

Author: S. R. Lautenschlager, H. A. Neal, T. Hilse, O. Runolfsson, D. J. Miller, Claudio Grandi, T. R. Wyatt, R. J. Barlow, M. Fierro, J. E.G. Edwards, H. Mes, Ekg Sarkisyan, R. Bartoldus, P. W. Jeffreys, H. O. Ogren, Christoph Geich-Gimbel, Gideon Bella, Daniel Lellouch, C. H. Shepherd-Themistocleous, H. J. Burckhart, M. Hapke, S. M. Gascon-Shotkin, J. J. Ward, P. Vikas, D. Lanske, S. Braibant, Andris Skuja, S. Petzold, G. D. Long, Tetsuro Mashimo, Jacqueline Batley, P. G. Estabrooks, A. S. Turcot, R. K. Keeler, Takehiko Mori, I. P. Duerdoth, A. D. Schaile, T. Omori, M. J. Oreglia, Gabriella Pasztor, P. Fath, F. X. Gentit, V. Zacek, N. K. Watson, W. Gorn, Matthew Evans, A. M. Rossi, J. E. Conboy, A. Fürtjes, R. W. Springer, C. R. Jones, T. Tsukamoto, P. M. Watkins, G. A. Snow, C. P. Ward, S. Söldner-Rembold, H. M. Fischer, P. Poffenberger, P. Scharff-Hansen, G. N. Patrick, I. J. Bloodworth, Otmar Biebel, M. F. Turner-Watson, M. Morii, Peter R Hobson, J. Palinkas, A. M. Smith, P. Schütz, S. A. Robins, Yoram Rozen, Dave Charlton, Georges Azuelos, K. Sachs, P. Routenburg, Sachio Komamiya, M. Schumacher, E. Tsur, C. M. Hawkes, E. Lefebvre, M. Foucher, Shlomo Dado, S. L. Chu, W. Mohr, M. Boutemeur, F. S. Merritt, G. Vasseur, A. Posthaus, J. Letts, M. Verzocchi, James Pinfold, J. R. Carter, R. Bürgin, Silvia Arcelli, K. W. Bell, F. Odorici, Norbert Wermes, Sherry Towers, Theodoros Geralis, E. Ros, A. T. Watson, S. Yamashita, J. Lauber, T. Kawamoto, P. Igo-Kemenes, S. B. Anderson, P. Szymanski, G. Giacomelli, J. Bechtluft, J. A. McKenna, D. G. Fong, C. Lewis, Stefan Kluth, J. Gascon, Giora Mikenberg, Shlomit Tarem, D. Karlen, U. Jost, R. Mir, J. C. Hill, Misao Sasaki, C. Y. Chang, S. Orito, M. Rosvick, W. J. McDonald, K. Ishii, H. Jeremie, R. E. Hughes-Jones, N. I. Geddes, Michael Hildreth, F. Strumia, S. D. Talbot, T. P. Kokott, A. Luig, E. A. Mckigney, N. L. Rodning, P. Taras, A. Malik, J. W. Gary, W. P. Lai, D. S. Koetke, B. Poli, Marcello Mannelli, Michael Kobel, V. Gibson, O. Schaile, Stan Bentvelsen, B. C. Shen, Siegfried Bethke, A. K. Honma, W. G. Scott, I. Nakamura, Stefan Schmitt, D. L. Rees, A. I. McNab, F. Scharf, J. Goldberg, T. J. Smith, J. M. Roney, F. G. Oakham, B. Stockhausen, Paul Kyberd, F. K. Loebinger, E. do Couto e Silva, B. Schmitt, G. D. Lafferty, J. Steuerer, T. Behnke, German Martinez, Eilam Gross, Julie Kirk, E. L. Barberio, B. Nellen, P. Mättig, D. E. Hutchcroft, Joleen Pater, Sven Menke, D. Glenzinski, Shoji Asai, P. Gagnon, J. Allison, Reda Tafirout, Klaus Kurt Desch, P. A. Hart, M. Gruwé, R. Giacomelli, W. Matthews, C. Dallapiccola, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, A. Sittler, H. G. Evans, B. Nijjhar, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, H. M. Bosch, M. J. Pearce, M. A. Thomson, Richard Nisius, N. Altekamp, A. Gaidot, M. J. Goodrick, S. W. O'Neale, I. Cohen, M. Sproston, K. J. Anderson, Marco Cuffiani, A. Joly, C. Hartmann, Guenter Duckeck, D. E. Plane, D. Axen, A. Jawahery, Gunter Wolf, Matthias Schröder, R. Kowalewski, Peter Sherwood, M. Thiergen, D. Rigby, R. J. Hemingway, Stephen Hillier, G. M. Dallavalle, H. Lafoux, Alexander Wagner, J. Ludwig, K. Runge, K. Ametewee, P. Bock, B. W. Kennedy, P. Jovanovic, Gideon Alexander, Paolo Capiluppi, K. Stephens, Austin Ball, Peter Krieger, W. R. Gibson, R. G. Kellogg, Manuella Vincter, Alessandro Montanari, M. Steiert, Csaba Hajdu, Stefano Marcellini, B. T. Bouwens, U. Müller, A. J. Martin, D. Chrisman, Volker Blobel, Lorne Levinson, Stephen Lloyd, A. Skillman, Robert M Brown, T. R. Junk, C. K. Hargrove, Ehud Duchovni, M. Jimack, A. Michelini, D. R. Ward, Satoshi Tanaka, T. Kobayashi, T. Kress, Frank Fiedler, U. Ruppel, M. R. Ingram, Paolo Giacomelli, M. Hansroul, C. Burgard, R. J. Homer, Achim Stahl, T. J. McMahon, P. Pfeifenschneider, R. K. Carnegie, J. Patt, M. Bobinski, J. A. Wilson, G. G. Hanson, P. Schenk, D. Lazic, M. S. Dixit, C. Sbarra, Frans Meijers, G. Yekutieli, A. Rooke, J. G. Layter, C. Charlesworth, A. A. Carter, Ron Folman, Roger Jones, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, B. J. King, P. Utzat, H. Przysiezniak, A. N. Bell, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, R. Lahmann, D. C. Imrie, G. P. Siroli, Kiyotomo Kawagoe, P. Weber, K. Nagai, P. S. Wells, D. R. Rust, J. E. Bloomer, D. M. Strom, R. Rylko, A. M. Lee, M. Tecchio, E. von Törne, R. Howard, J. S. White, R. Van Kooten, C.J. Beeston, T. G. Shears, F. Wäckerle, D. M. Gingrich, P. Berlich, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, Gregor Herten, B. Wilkens, J. E. Pilcher, M. Starks, G. W. Wilson, M. Hauschild, S. A. Wotton, C. Markus, G. T. Jones, and E. H. Vokurka
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Electron–positron annihilation, Fermion, Particle Physics - Experiment, Standard Model
Abstract: The differential cross-sections for e + e − → e + e − , e + e − → μ + μ − and e + e − → τ + τ − , and the total cross-section for e + e − → qq at centre-of-mass energies of 130–140 GeV were studied using about 5 pb −1 of data collected with the OPAL detector at LEP in October and November 1995. The results are in agreement with the Standard Model predictions. Four-fermion contact interaction models were fitted to the data and lower limits were obtained on the energy scale Λ at the 95% confidence level.
Published: 1996
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28. Prompt production in hadronic Z0 decays

Author: R. Van Kooten, Gideon Bella, C. H. Shepherd-Themistocleous, H. J. Burckhart, F. Wäckerle, C. Y. Chang, J. Lauber, P. Berlich, A. S. Turcot, M. Hapke, Ekg Sarkisyan, Jacqueline Batley, P. Taras, D. R. Rust, A. M. Lee, M. Tecchio, E. von Törne, Sachio Komamiya, D. E. Hutchcroft, R. Bartoldus, R. W. Springer, D. M. Strom, A. Rooke, G. Azuelos, T. Omori, I. J. Bloodworth, J. G. Layter, O. C. Cooke, S. Yamashita, P. Igo-Kemenes, Theodoros Geralis, E. Ros, A. T. Watson, Madjid Boutemeur, M. J. Oreglia, F. Strumia, S. D. Talbot, H. O. Ogren, Christoph Geich-Gimbel, P. W. Jeffreys, H. Fukui, C. Charlesworth, R. Rylko, Julie Kirk, H. Jeremie, K. Stephens, Gregor Herten, James Pinfold, J. E. Conboy, T. P. Kokott, R. E. Hughes-Jones, D. G. Fong, C. Lewis, H. Mes, I. P. Duerdoth, Gunter Wolf, F. X. Gentit, J. Gascon, Yoram Rozen, J. von Krogh, P. G. Estabrooks, R. K. Keeler, U. Jost, R. Mir, A. Luig, B. Wilkens, C. Hartmann, E. Tsur, D. E. Plane, M. Foucher, P. Fath, J. R. Carter, G. N. Patrick, G. G. Hanson, A. Fürtjes, R. J. Hawkings, J. P. Pansart, M. Verzocchi, K. W. Bell, E. do Couto e Silva, J. E. Pilcher, L. A. del Pozo, C. Sbarra, A. Malik, D. Karlen, C. Burgard, Stephen Hillier, S. B. Anderson, J. Pálinkás, P. Szymanski, J. W. Gary, Otmar Biebel, D. S. Koetke, P. S. Wells, P. Schenk, S. W. O'Neale, G. Yekutieli, Terry Richard Wyatt, Marcello Mannelli, Stefan Schmitt, E. Lefebvre, P. M. Watkins, K. J. Anderson, Sven Menke, G. M. Dallavalle, A. Sittler, F. S. Merritt, M. S. Dixit, Frans Meijers, J. E. Bloomer, Dave Charlton, A. A. Carter, Ron Folman, Roger Jones, T. J. Smith, F. G. Oakham, F. Odorici, J. C. Hill, Stan Bentvelsen, P. E.L. Clarke, M. K. Jones, H. M. Bosch, J. P. Martin, Misao Sasaki, W. J. McDonald, B. C. Shen, T. R. Junk, Siegfried Bethke, B. J. King, J. Bechtluft, J. A. McKenna, M. Kobe, M. Tscheulin, J. Ludwig, P. Utzat, O. Schaile, P. Mättig, Shoji Asai, R. Bürgin, M. F. Turner-Watson, Andris Skuja, S. Petzold, G. D. Long, Tetsuro Mashimo, M. Morii, S. De Jong, Silvia Arcelli, J. Letts, E. L. Barberio, Daniel Lellouch, N. Werrnes, B. Nijjhar, C. Dallapiccola, W. G. Scott, Sherry Towers, Peter R Hobson, P. Poffenberger, T. J. McMahon, J. J. Ward, P. Vikas, M. Starks, D. Lanske, Takehiko Mori, H. Przysiezniak, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Stefan Kluth, Shlomit Tarem, T. Kawamoto, R. K. Carnegie, P. Routenburg, G. Giacomelli, D. Axen, P. Pfeifenschneider, W. Gorn, A. Jawahery, A. N. Bell, J. A. Wilson, D. R. Ward, H. Lafoux, R. J. Barlow, D. J. Miller, V. Zacek, P. Schütz, S. Orito, E. A. Mckigney, M. Rosvick, Reda Tafirout, Klaus Kurt Desch, A. I. McNab, Peter Sherwood, T. Kress, D. Lazic, G. W. Wilson, R. Howard, J. S. White, M. Hauschild, J. Goldberg, S. R. Lautenschlager, S. A. Wotton, Guenter Duckeck, W. P. Lai, P. Scharff-Hansen, Alexander Wagner, A. K. Honrna, A. Gaidot, K. Runge, P. Bock, C. Markus, Dezso Horvath, M. J. Losty, J. M. Roney, H. A. Neal, D. Rigby, R. J. Hemingway, Jean-Arcady Meyer, H. G. Evans, U. Ruppel, M. R. Ingram, M. J. Goodrick, G. T. Jones, E. H. Vokurka, T. Hilse, A. M. Smith, I. Cohen, B. W. Kennedy, P. Jovanovic, G. Vasseur, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, O. Runolfsson, S. Braibant, Gabriella Pasztor, C. Beeston, Claudio Grandi, G. A. Snow, C. P. Ward, P. Gagnon, S. Söldner-Rembold, A. Joly, M. Fierro, J. E.G. Edwards, C. R. Jones, Shlomo Dado, Paolo Giacomelli, Kiyotomo Kawagoe, M. Hansroul, P. Weber, Giora Mikenberg, R. Lahmann, D. C. Imrie, B. Stockhausen, Paul Kyberd, F. K. Loebinger, G. P. Siroli, R. J. Homer, S. L. Chu, J. Hoare, J. Steuerer, Joleen Pater, S. M. Gascon-Shotkin, Frank Fiedler, Achim Stahl, R. Giacomelli, B. Schmitt, N. Altekamp, Matthew Evans, A. M. Rossi, T. Behnke, U. Müller, A. J. Martin, T. Tsukamoto, Eilam Gross, John Allison, C. K. Hargrove, Matthias Schröder, M. Thiergen, M. Gruwé, C. M. Hawkes, Ehud Duchovni, D. M. Gingrich, M. Jimack, N. I. Geddes, B. Nellen, V. Gibson, Michael Hildreth, R. G. Kellogg, M. Steiert, A. Michelini, Tara Shears, Richard Nisius, Csaba Hajdu, N. L. Rodning, Marco Cuffiani, P. A. Hart, Stefano Marcellini, Satoshi Tanaka, T. Kobayashi, B. Poli, M. J. Pearce, H. M. Fischer, D. Chrisman, S. A. Robins, Volker Blobel, Stephen Lloyd, Robert M Brown, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, W. R. Gibson, B. T. Bouwens, Lorne Levinson, Gilles Beaudoin, A. Skillman, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, W. Matthews, M. A. Thomson, T. Wlodek, M. Sproston, D. L. Rees, F. Scharf, German Martinez, A. D. Schaile, N. K. Watson, W. Mohr, and A. Posthaus
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Hadron, Energy spectrum, Tevatron, High Energy Physics::Experiment, Lepton
Abstract: Evidence is presented for the production of prompt J/psi mesons (not originating in b-hadron decays) in hadronic Z(0) decays. Using a sample of 3.6 million hadronic events, 24 prompt J/psi candidates are identified from their decays into e(+)e(-) and mu(+)mu(-)pairs. The background is estimated to be 10.2+/-2.0 events. The following branching ratio for prompt J/psi production is obtained: Br(Z(0)-->prompt J/psi+X)=(1.9+/-0.7+/-0.5+/-0.5). 10(-4), where the first error is statistical, the second systematic and the third error accounts for uncertainties in the prompt J/psi production mechanism.
Published: 1996
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29. A first measurement of the Λ and ΛΛ () spin compositions in hadronic Z0 decays

Author: S. Yamashita, Dave Charlton, F. S. Merritt, W. J. McDonald, Stefan Kluth, Shlomit Tarem, B. C. Shen, Otmar Biebel, P. Igo-Kemenes, H. Jeremie, R. E. Hughes-Jones, Siegfried Bethke, R. Bürgin, O. Schaile, A. K. Honma, B. Nijjhar, D. E. Plane, W. G. Scott, Stephen Hillier, Robert McPherson, J. Bechtluft, Madjid Boutemeur, G. M. Dallavalle, J. A. McKenna, M. Starks, E. do Couto e Silva, H. O. Ogren, A. A. Carter, Christoph Geich-Gimbel, J. E. Conboy, U. Jost, R. Mir, A. Fürtjes, Stefan Schmitt, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, P. Poffenberger, Sven Menke, P. G. Estabrooks, R. K. Keeler, Mathieu Doucet, Gideon Bella, J. E. Bloomer, C. H. Shepherd-Themistocleous, H. J. Burckhart, R. D. Heuer, Fabrizio Fabbri, A. I. McNab, P. Schütz, P. M. Watkins, Jacqueline Batley, J. Goldberg, J. Letts, T. J. McMahon, P. Mättig, A. Gaidot, D. R. Rust, B. Nellen, E. Lefebvre, M. F. Turner-Watson, R. W. Springer, M. Morii, T. Omori, Gregor Herten, F. Odorici, A. Rooke, F. G. Oakham, Shoji Asai, Peter R Hobson, E. L. Barberio, Norbert Wermes, Sherry Towers, Reda Tafirout, Klaus Kurt Desch, R. K. Carnegie, B. Wilkens, J. G. Layter, H. G. Evans, C. Dallapiccola, C. Charlesworth, R. Howard, M. J. Goodrick, P. Routenburg, J. S. White, A. M. Lee, E. Tsur, J. A. Wilson, T. Kawamoto, I. Cohen, Sachio Komamiya, M. Verzocchi, M. Tecchio, E. von Törne, C. Y. Chang, Theodoros Geralis, E. Ros, A. T. Watson, K. W. Bell, J. P. Pansart, J. Pálinkás, Gunter Wolf, F. X. Gentit, I. J. Bloodworth, J. C. Hill, Misao Sasaki, J. E. Pilcher, P. E.L. Clarke, N. Altekamp, P. Taras, W. R. Gibson, Michael Kobel, M. K. Jones, E. A. Mckigney, R. J. Barlow, J. P. Martin, S. Orito, M. Tscheulin, H. Mes, A. S. Turcot, B. T. Bouwens, I. P. Duerdoth, D. J. Miller, A. Luig, M. Rosvick, S. De Jong, R. Bartoldus, W. P. Lai, P. Fath, Yoram Rozen, D. Lazic, C. R. Jones, M. Foucher, R. M. Brown, G. W. Wilson, M. Hauschild, Lorne Levinson, S. A. Wotton, O. C. Cooke, Julie Kirk, T. P. Kokott, D. Axen, Gilles Beaudoin, A. Jawahery, C. Markus, J. M. Roney, A. Skillman, H. Przysiezniak, D. M. Strom, R. Van Kooten, D. Rigby, R. J. Hemingway, A. N. Bell, D. Karlen, C. Burgard, G. T. Jones, B. W. Kennedy, E. H. Vokurka, Daniel Lellouch, H. Fukui, P. Jovanovic, G. G. Hanson, M. Hapke, Austin Ball, J. von Krogh, R. Rylko, M. Fierro, J. E.G. Edwards, Takehiko Mori, Ekg Sarkisyan, P. W. Jeffreys, Peter Krieger, Peter Sherwood, V. Zacek, F. Wäckerle, G. Giacomelli, D. M. Gingrich, S. W. O'Neale, Manuella Vincter, R. J. Hawkings, Alessandro Montanari, K. J. Anderson, L. A. del Pozo, P. Schenk, C. Sbarra, D. E. Hutchcroft, M. S. Dixit, Frans Meijers, P. Berlich, J. J. Ward, Alexander Wagner, J. Ludwig, P. Vikas, K. Runge, G. Yekutieli, P. Bock, D. Lanske, S. R. Lautenschlager, J. Lauber, M. J. Oreglia, P. S. Wells, H. A. Neal, Ron Folman, Roger Jones, T. Hilse, O. Runolfsson, B. J. King, P. Utzat, Terry Richard Wyatt, C. Beeston, Claudio Grandi, J. R. Carter, G. N. Patrick, F. Strumia, S. D. Talbot, G. Azuelos, P. Gagnon, A. Sittler, Hans-Christian Schultz-Coulon, H. M. Bosch, Randall Sobie, Michael Schulz, G. D. Lafferty, Guenter Duckeck, C. Hartmann, P. Szymanski, Stan Bentvelsen, M. Sproston, Andris Skuja, S. Petzold, G. D. Long, Tetsuro Mashimo, Achim Stahl, W. Gorn, B. Stockhausen, Paul Kyberd, F. K. Loebinger, B. Schmitt, J. Steuerer, Joleen Pater, R. Giacomelli, P. Scharff-Hansen, P. Pfeifenschneider, A. Joly, A. M. Smith, G. Vasseur, Paolo Giacomelli, John Allison, M. Hansroul, James Pinfold, R. G. Kellogg, D. G. Fong, C. Lewis, M. Steiert, J. Gascon, R. J. Homer, Csaba Hajdu, Stefano Marcellini, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. Hoare, U. Ruppel, M. R. Ingram, T. J. Smith, K. Stephens, V. Gibson, T. Behnke, T. R. Junk, D. R. Ward, H. Lafoux, T. Kress, M. Gruwé, S. Braibant, C. M. Hawkes, Gabriella Pasztor, Frank Fiedler, G. A. Snow, C. P. Ward, S. Söldner-Rembold, R. Lahmann, D. C. Imrie, Shlomo Dado, G. P. Siroli, Giora Mikenberg, Richard Nisius, Kiyotomo Kawagoe, P. Weber, D. Chrisman, Marco Cuffiani, Volker Blobel, S. L. Chu, N. I. Geddes, Stephen Lloyd, Michael Hildreth, N. L. Rodning, B. Poli, Ehud Duchovni, M. Jimack, A. Michelini, H. M. Fischer, Satoshi Tanaka, T. Kobayashi, S. A. Robins, U. Müller, S. M. Gascon-Shotkin, A. J. Martin, Matthew Evans, A. M. Rossi, T. Tsukamoto, R. Kowalewski, C. K. Hargrove, Matthias Schröder, M. Thiergen, K. Ametewee, Gideon Alexander, Tara Shears, Paolo Capiluppi, P. A. Hart, M. J. Pearce, D. L. Rees, F. Scharf, German Martinez, A. D. Schaile, N. K. Watson, W. Mohr, A. Posthaus, W. Matthews, M. A. Thomson, E. K. U. Gross, and T. Wlodek
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Spin states, Hadron, Hyperon, Nuclear physics, symbols.namesake, Pair production, Pauli exclusion principle, symbols, High Energy Physics::Experiment, Invariant mass, Spin (physics)
Abstract: The spin composition of Λ Λ , ΛΛ and Λ Λ pairs at low invariant mass values has been measured for the first time in multihadronic Z0 decays with the OPAL detector at LEP. No single spin state has been observed in the Λ Λ sample, verifying that the low mass enhancement in this sample, attributed to local baryon number compensation, is not a resonance state. The fraction of the spin 1 contribution to the Λ Λ pairs was found to be consistent with the value 0.75, as expected from a statistical spin mixture. This may be the net effect of many different QCD processes which contribute to the hyperon anti-hyperon pair production. The spin composition of the identical ΛΛ and Λ Λ pairs, well above threshold, is found to be similar to that of the Λ Λ sample. A ΛΛ emitter dimension is estimated from the data assuming the onset of the Pauli exclusion principle near threshold.
Published: 1996
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30. Search for chargino and neutralino production using the OPAL detector at =130−136 GeV at LEP

Author: Tara Shears, W. J. McDonald, B. C. Shen, P. A. Hart, A. P. Wagner, Reda Tafirout, D. Chrisman, Volker Blobel, M. J. Pearce, Sachio Komamiya, Ekg Sarkisyan, Siegfried Bethke, B. Nijjhar, W. G. Scott, S. L. Chu, T. Behnke, J. Steuerer, M. Gruwé, C. M. Hawkes, Richard Nisius, P. Weber, Marco Cuffiani, Stephen Lloyd, G. G. Hanson, E. Ros, A. T. Watson, S. B. Anderson, P. Szymanski, Daniel Lellouch, T. J. Smith, K. Stephens, P. W. Jeffreys, E. Lefebvre, Andris Skuja, Koji Yoshimura, Takehiko Mori, S. Yamashita, W. R. Gibson, Madjid Boutemeur, F. Odorici, G. Giacomelli, Dezso Horvath, M. J. Losty, D. M. Strom, S. Petzold, G. D. Long, A. Joly, P. Poffenberger, P. Igo-Kemenes, Shlomo Dado, Matthias Schröder, T. P. Kokott, Stan Bentvelsen, Jean-Arcady Meyer, B. T. Bouwens, P. Schenk, M. Hauschild, A. Luig, Tetsuro Mashimo, H. Fukui, V. Zacek, F. S. Merritt, Ehud Duchovni, V. Gibson, P. G. Estabrooks, H. Jeremie, R. E. Hughes-Jones, R. K. Keeler, R. Rylko, R. M. Brown, Lorne Levinson, M. S. Dixit, M. Jimack, Frans Meijers, D. L. Rees, M. Hapke, M. Thiergen, H. Lafoux, D. E. Hutchcroft, Achim Stahl, F. Palmonari, Gilles Beaudoin, C. Sbarra, A. Skillman, F. Scharf, C. Markus, N. I. Geddes, German Martinez, J. J. Ward, W. Gorn, Michael Hildreth, P. Vikas, R. D. Heuer, P. M. Watkins, Giora Mikenberg, P. Schütz, E. do Couto e Silva, S. W. Gensler, Fabrizio Fabbri, S. Söldner-Rembol, A. S. Turcot, R. W. Springer, D. Lanske, A. D. Schaile, C. Hartmann, D. E. Plane, T. Kobayashi, J. Bechtluft, N. L. Rodning, B. Schmitt, Sven Menke, G. T. Jones, M. J. Oreglia, D. R. Ward, B. Stockhausen, Paul Kyberd, F. K. Loebinger, T. Kress, R. Lahmann, D. C. Imrie, M. Palazzo, J. A. McKenna, M. R. Ingram, E. H. Vokurka, James Pinfold, Stephen Hillier, Silvia Arcelli, G. M. Dallavalle, W. Matthews, B. Poli, S. Braibant, G. Yekutieli, D. R. Rust, Stefan Kluth, D. M. Gingrich, M. A. Thomson, E. Tsur, D. G. Fong, C. Lewis, Joleen Pater, C. Darling, Gabriella Pasztor, H. Mes, I. P. Duerdoth, Shlomit Tarem, J. Gascon, Paolo Giacomelli, M. Verzocchi, K. W. Bell, M. Hansroul, C. Y. Chang, E. K. U. Gross, R. Giacomelli, T. Hilse, R. Bartoldus, G. P. Siroli, J. King, P. Fath, O. Runolfsson, A. Gaidot, P. Mättig, J. Pálinkás, Shoji Asai, J. C. Hill, Gregor Herten, T. Wlodek, M. Sproston, S. M. Gascon-Shotkin, Christoph Geich-Gimbel, A. A. Carter, G. A. Snow, C. P. Ward, A. M. Lee, P. Taras, A. Rooke, Misao Sasaki, A. Malik, Carsten Daniel Burgard, J. G. Layter, Michael Kobel, M. Tecchio, A. H. Bain, I. J. Bloodworth, E. von Törne, J. W. Gary, Ron Folman, C. Beeston, E. A. Mckigney, W. P. Lai, R. Kowalewski, B. Wilkens, U. Müller, D. S. Koetke, C. Charlesworth, N. Tesch, J. R. Carter, G. N. Patrick, Otmar Biebel, Claudio Grandi, John Allison, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Marcello Mannelli, Matthew Evans, Gunter Wolf, J. E. Pilcher, Julie Kirk, Stefania Xella, C. H. Shepherd-Themistocleous, A. M. Rossi, R. J. Homer, F. X. Gentit, A. J. Martin, R. Howard, Yoram Rozen, A. Fürtjes, M. F. Turner-Watson, N. K. Watson, K. Ametewee, M. Morii, Peter R Hobson, J. E. Conboy, J. S. White, Roger Jones, S. Wotton, J. P. Pansart, H. M. Fischer, J. M. Roney, P. Scharff-Hansen, P. E.L. Clarke, P. Utzat, M. K. Jones, Gideon Alexander, M. Foucher, A. Michelini, Paolo Capiluppi, R. G. Kellogg, J. P. Martin, R. Van Kooten, M. Tscheulin, P. Routenburg, A. I. McNab, S. De Jong, M. G. Rison, Guenter Duckeck, Frank Fiedler, J. Letts, G. W. Wilson, Junichi Kanzaki, S. A. Robins, D. Karlen, J. Goldberg, W. Mohr, O. Schaile, A. Posthaus, P. S. Wells, B. Nellen, M. Fierro, S. W. O'Neale, Norbert Wermes, Sherry Towers, T. Kawamoto, H. Przysiezniak, K. J. Anderson, T. J. McMahon, J. E.G. Edwards, A. M. Smith, Terry Richard Wyatt, C. K. Hargrove, M. Starks, J. E. Bloomer, A. N. Bell, F. Wäckerle, G. Vasseur, B. Lorazo, H. G. Evans, M. J. Goodrick, I. Cohen, S. Orito, J. Schwiening, M. Rosvick, R. K. Carnegie, P. Berlich, J. A. Wilson, O. C. Cooke, J. von Krogh, Csaba Hajdu, R. J. Hawkings, Stefano Marcellini, L. A. del Pozo, Gideon Bella, H. J. Burckhart, Jacqueline Batley, G. Azuelos, T. Omori, H. O. Ogren, D. Rigby, R. J. Hemingway, D. Axen, A. Jawahery, T. Geralis, B. W. Kennedy, P. Jovanovic, Peter Sherwood, Peter Krieger, Manuella Vincter, Alessandro Montanari, J. Ludwig, K. Runge, P. Bock, Dave Charlton, C. Dallapiccola, R. Bürgin, P. Gagnon, N. Altekamp, R. J. Barlow, D. J. Miller, A. K. Honma, U. Jost, R. Mir, A. Sittler, H. Takeda, F. G. Oakham, E. L. Barberio, H. M. Bosch, J. Lauber, and F. Strumia
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Detector, Scalar (mathematics), Lightest Supersymmetric Particle, Lower limit, Nuclear physics, Chargino, Neutralino, High Energy Physics::Experiment, Particle Physics - Experiment, Minimal Supersymmetric Standard Model
Abstract: A search for charginos and neutralinos, predicted by supersymmetric theories, has been performed using a data sample of 2.6 pb−1 at a centre-of-mass energy of S=130 GeV and 2.6 pb−1 at 136 GeV collected with the OPAL detector at LEP during November 1995. No candidate events were observed. The 95% C.L. lower limit on the lightest chargino mass in the Minimal Supersymmetric Standard Model is 65.4 GeV if the universal scalar mass m0 is greater than 1 TeV, and 58.7 GeV for the smallest m0 compatible with slepton and sneutrino mass limits obtained at centre-of-mass energies near the Z peak. These limits were obtained under the conditions that the lightest chargino is heavier than the lightest neutralino by more than 10 GeV and tan β is larger than 1.5. The results of a model independent search for charginos and neutralinos are also given.
Published: 1996
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31. Topological search for the production of neutralinos and scalar particles

Author: C. Sbarra, G. Yekutieli, Ehud Duchovni, J. Lauber, Shlomo Dado, A. S. Turcot, Dave Charlton, A. A. Carter, Ron Folman, M. Jimack, Roger Jones, P. E.L. Clarke, M. K. Jones, Otmar Biebel, P. Utzat, Reda Tafirout, S. W. Gensler, T. Kobayashi, J. P. Martin, M. Kobe, M. Tscheulin, Matthias Schröder, Giora Mikenberg, M. Thiergen, F. Strumia, M. G. Rison, R. Bürgin, Andris Skuja, S. Petzold, G. D. Long, Frank Fiedler, P. S. Wells, Terry Richard Wyatt, J. E. Bloomer, H. Mes, I. P. Duerdoth, P. Fath, H. M. Fischer, A. Michelini, O. Schaile, M. Starks, Sachio Komamiya, Theodoros Geralis, E. Ros, R. Kowalewski, B. Stockhausen, Paul Kyberd, S. A. Robins, E. Lefebvre, F. Odorici, T. P. Kokott, K. Ametewee, F. K. Loebinger, S. De Jong, Tara Shears, Gideon Alexander, A. Luig, H. Przysiezniak, R. W. Springer, Tetsuro Mashimo, K. Stephens, Paolo Capiluppi, Gregor Herten, D. J. Miller, J. Steuerer, A. I. McNab, J. Goldberg, B. Nellen, R. Bartoldus, B. Wilkens, I. J. Bloodworth, J. Letts, P. A. Hart, R. Lahmann, D. C. Imrie, M. Palazzo, H. O. Ogren, S. Braibant, Gabriella Pasztor, Norbert Wermes, T. Behnke, A. N. Bell, S. Yamashita, J. P. Pansart, Joleen Pater, W. R. Gibson, Richard Keeler, M. J. Pearce, Mathieu Doucet, Georges Azuelos, Sherry Towers, V. Gibson, J. E. Pilcher, Christoph Geich-Gimbel, T. J. McMahon, P. Igo-Kemenes, E. Tsur, S. M. Gascon-Shotkin, G. P. Siroli, J. King, R. D. Heuer, Fabrizio Fabbri, T. Kawamoto, B. T. Bouwens, M. Verzocchi, D. Axen, A. Jawahery, G. A. Snow, C. P. Ward, G. W. Wilson, K. W. Bell, J. Pálinkás, H. Jeremie, M. Hauschild, H. G. Evans, J. Schwiening, R. K. Carnegie, M. J. Goodrick, I. Cohen, M. Gruwé, J. C. Hill, Misao Sasaki, S. Söldner-Rembold, Peter Sherwood, M. Fierro, J. E.G. Edwards, C. Markus, C. M. Hawkes, R. E. Hughes-Jones, D. Chrisman, Volker Blobel, R. Giacomelli, Yoram Rozen, D. R. Rust, J. A. Wilson, W. J. McDonald, B. C. Shen, Siegfried Bethke, A. K. Honma, W. Gorn, G. T. Jones, Alexander Wagner, Ekg Sarkisyan, Lorne Levinson, P. W. Jeffreys, Matthew Evans, E. H. Vokurka, S. Orito, M. Rosvick, M. F. Turner-Watson, Achim Stahl, J. Ludwig, A. Rooke, D. R. Ward, H. Lafoux, A. M. Rossi, T. Kress, B. Nijjhar, W. G. Scott, J. G. Layter, M. Morii, Peter R Hobson, K. Runge, P. Bock, A. J. Martin, Gilles Beaudoin, Richard Nisius, R. Howard, M. Foucher, A. Skillman, A. M. Lee, P. Routenburg, P. Weber, Marco Cuffiani, Stephen Lloyd, M. Tecchio, E. von Törne, Robert M Brown, Gideon Bella, C. H. Shepherd-Themistocleous, H. J. Burckhart, S. Asa, J. S. White, S. W. O'Neale, C. Charlesworth, M. R. Ingram, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, E. do Couto e Silva, P. Scharff-Hansen, P. Gagnon, Stefan Kluth, Shlomit Tarem, P. Bright-Thomas, K. J. Anderson, N. I. Geddes, Michael Hildreth, M. Hapke, D. E. Plane, S. L. Chu, Jacqueline Batley, B. Schmitt, O. C. Cooke, R. Van Kooten, Stephen Hillier, U. Müller, N. L. Rodning, B. Poli, C. K. Hargrove, D. Rigby, R. J. Hemingway, Stefania Xella, D. E. Hutchcroft, Junichi Kanzaki, G. M. Dallavalle, J. E. Conboy, J. J. Ward, P. Vikas, A. Fürtjes, P. Poffenberger, A. M. Smith, Sven Menke, A. Sittler, G. Vasseur, B. Lorazo, F. Wäckerle, D. Karlen, C. Burgard, T. Omori, D. M. Gingrich, Alan Watson, J. von Krogh, D. Lanske, B. W. Kennedy, P. Jovanovic, Silvia Arcelli, P. Schütz, M. J. Oreglia, P. Berlich, R. J. Hawkings, A. Gaidot, Gunter Wolf, F. X. Gentit, H. M. Bosch, G. G. Hanson, L. A. del Pozo, Austin Ball, Peter Krieger, James Pinfold, C. Y. Chang, D. G. Fong, C. Lewis, J. Gascon, D. M. Strom, C. Darling, P. Taras, T. J. Smith, Manuella Vincter, Alessandro Montanari, Paolo Giacomelli, M. Hansroul, A. Malik, G. Giacomelli, E. A. Mckigney, J. W. Gary, P. Mättig, D. S. Koetke, S. Wotton, Marcello Mannelli, R. J. Homer, J. R. Carter, G. N. Patrick, Julie Kirk, U. Jost, R. Mir, H. Fukui, P. Schenk, R. Rylko, Daniel Lellouch, T. Hilse, S. B. Anderson, C. Hartmann, Takehiko Mori, P. Szymanski, F. S. Merritt, O. Runolfsson, W. P. Lai, V. Zacek, H. Takeda, M. S. Dixit, Frans Meijers, F. G. Oakham, E. L. Barberio, C. Dallapiccola, C. Beeston, A. Joly, N. Altekamp, Stan Bentvelsen, R. J. Barlow, J. Bechtluft, J. A. McKenna, Claudio Grandi, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Guenter Duckeck, J. M. Roney, John Allison, Madjid Boutemeur, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, P. G. Estabrooks, P. M. Watkins, Koji Yoshimura, D. L. Rees, F. Scharf, German Martinez, A. D. Schaile, N. K. Watson, W. Mohr, A. Posthaus, W. Matthews, M. A. Thomson, E. K. U. Gross, T. Wlodek, M. Sproston, and N. Tesch
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Missing energy, Electron–positron annihilation, High Energy Physics::Phenomenology, Scalar (mathematics), Supersymmetry, law.invention, Nuclear physics, law, Neutralino, High Energy Physics::Experiment, Neutrino, Collider, Particle Physics - Experiment, Minimal Supersymmetric Standard Model
Abstract: A search for scalar particles and neutralinos such as those predicted by supersymmetric models has been performed using a data sample of 4.4 million hadronic Z 0 decays recorded by the OPAL detector at the e + e − collider LEP. The production of such particles typically leads to event topologies consisting of an acoplanar pair of jets, or of a mono-jet, accompanied by sizeable missing energy owing to neutrinos and other undetectable neutral particles. Limits are obtained, at the 95% confidence level, on the masses and production rates of scalar particles produced in association with the Z 0 . Limits are also placed on neutralino production, for which an additional possible signature is also studied, events containing a single observed photon. Within the Minimal Supersymmetric Standard Model, the mass of the lightest neutralino is found to be larger than 12.5 GeV/ c 2 at 95% C.L., provided that tan β is larger than 1.5.
Published: 1996
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32. J/ $\psi$ and $\psi^\prime$ production in hadronic ${\rm Z}^0$ decays

Author: Gunter Wolf, R. Lahmann, D. C. Imrie, M. Palazzo, I. J. Bloodworth, R. Bartoldus, S. Wotton, H. O. Ogren, Christoph Geich-Gimbel, J. Lauber, P. Poffenberger, E.K.G. Sarkisian, P. S. Wells, David E. Plane, G. P. Siroli, J. King, Frank Fiedler, D. Hochman, Terry Richard Wyatt, M. Hapke, S. Yamashita, P. Igo-Kemenes, Yoram Rozen, J. E. Bloomer, M. Foucher, E. A. Mckigney, D. E. Hutchcroft, Dixit, Matthias Schröder, F. Strumia, Gideon Bella, G.Marco Dallavalle, P. Schütz, T. J. Smith, K. Stephens, C. H. Shepherd-Themistocleous, B. Stockhausen, Paul Kyberd, F. K. Loebinger, P. W. Jeffreys, W.John McDonald, W. P. Lai, D. Chrisman, H. Lafoux, V. Gibson, H. Jeremie, F. X. Gentit, P. Scharff-Hansen, D. R. Ward, T. Kress, M. J. Oreglia, H. J. Burckhart, Jacqueline Batley, D. Karlen, R. E. Hughes-Jones, S. Braibant, Stefan Kluth, Joleen Pater, J. E. Conboy, A. Fürtjes, C. Burgard, Shlomit Tarem, S. B. Anderson, P. Szymanski, Gabriella Pasztor, P. Bright-Thomas, J. M. Roney, S. L. Chu, R. Giacomelli, C. M. Hawkes, A. M. Smith, Daniel Lellouch, Stephen Lloyd, Robert M Brown, C. J. Oram, R. D. Heuer, G. Vasseur, S. M. Gascon-Shotkin, Takehiko Mori, Fabrizio Fabbri, J. J. Ward, P. Vikas, J. R. Carter, Madjid Boutemeur, G. A. Beck, Achim Stahl, G. N. Patrick, Tara Shears, G. A. Snow, C. P. Ward, T. Omori, A. I. McNab, N. J. Oldershaw, C. Hartmann, D. M. Strom, C. Stegmann, B. Lorazo, J. Goldberg, U. C. Dunwoody, D. Lanske, Ehud Duchovni, Otmar Biebel, H. Fukui, E. do Couto e Silva, H. Mes, S. Söldner-Rembold, P. Gagnon, P. A. Hart, Stan Bentvelsen, B. Nellen, R. Rylko, I. P. Duerdoth, V. Zacek, James Pinfold, D. L. Wagner, M. Jimack, D. G. Fong, C. Lewis, P. G. Estabrooks, A. Sittler, M. J. Pearce, A. Joly, R. K. Keeler, P. Fath, F. S. Merritt, F. Wäckerle, Thomson, J. Gascon, S. W. O'Neale, Georges Azuelos, T. Hilse, O. Schaile, D. M. Gingrich, Sven Menke, E. Tsur, S. W. Gensler, K. J. Anderson, P. M. Watkins, Hans-Christian Schultz-Coulon, H. G. Evans, H. M. Bosch, Randall Sobie, A. M. Rossi, M. J. Goodrick, I. Cohen, S. J. Hillier, Michael Schulz, G. D. Lafferty, T. Kobayashi, P. Weber, O. Runolfsson, B. Schmitt, J. Letts, M. Starks, R. Howard, A. Malik, Norbert Wermes, T. Behnke, J. Palinkas, T. Tsukamoto, J. W. Gary, W. R. Gibson, K. W. Bell, John Allison, P. Berlich, U. Müller, J. P. Pansart, T. W. Pritchard, Sherry Towers, Hildreth, T. Kawamoto, J. Steuerer, C. Y. Chang, Shlomo Dado, H. M. Fischer, D. Axen, A. Jawahery, A. Michelini, G. W. Wilson, J. C. Hill, Misao Sasaki, C. Beeston, C. Darling, A. J. Martin, D. S. Koetke, B. T. Bouwens, Claudio Grandi, M. Hauschild, Marcello Mannelli, Guenter Duckeck, M. Rosvick, D. R. Rust, David G. Charlton, C. Markus, B. C. Shen, P. Mättig, R. G. Kellogg, Paolo Giacomelli, Shoji Asai, M. Hansroul, E. Lefebvre, Lorne Levinson, Peter Sherwood, P. Taras, Michael Kobel, Alexander Wagner, Siegfried Bethke, A. S. Turcot, E. H. Vokurka, A. K. Honma, B. Nijjhar, W. G. Scott, S. A. Robins, P. D. Phillips, Andris Skuja, J. Bechtluft, Csaba Hajdu, F. Odorici, Stefano Marcellini, Gilles Beaudoin, C. K. Hargrove, J. Ludwig, G. D. Long, K. Runge, J. A. McKenna, P. Bock, Roger Barlow, A. M. Lee, A. Skillman, R. J. Homer, Richard Nisius, Giora Mikenberg, M. Tecchio, R. Bürgin, E. von Törne, Tetsuro Mashimo, B. Fabbro, Gregor Herten, Marco Cuffiani, Dezso Horvath, M. J. Losty, B. Wilkens, Reda Tafirout, Margret Fincke-Keeler, Jean-Arcady Meyer, S. G. Clowes, Julie Kirk, J. E. Pilcher, M. Fierro, J. E.G. Edwards, N. I. Geddes, W. Gorn, N. L. Rodning, B. Poli, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, C. Sbarra, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. Orito, M. Tscheulin, S. De Jong, U. Jost, R. Mir, Sachio Komamiya, H. Takeda, Theodoros Geralis, F. G. Oakham, E. L. Barberio, E. Ros, A. T. Watson, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, Robert Wayne Springer, C. Dallapiccola, T. P. Kokott, A. Luig, N. Altekamp, D. J. Miller, W. Matthews, H. Przysiezniak, E. K. U. Gross, A. Gaidot, T. Wlodek, M. Sproston, N. Tesch, N. K. Watson, W. Mohr, A. Posthaus, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. L. Rees, A. N. Bell, F. Scharf, German Martinez, A. D. Schaile, P. Routenburg, J. G. Layter, C. Charlesworth, Stefania Xella, G. G. Hanson, G. Giacomelli, P. Schenk, R. Kowalewski, Rick J. Van Kooten, Frans Meijers, K. Ametewee, Gideon Alexander, Paolo Capiluppi, and Silvia Arcelli
Subjects: Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, B meson, Production rate, Lepton
Abstract: The production of J/psi mesons in Z(0) decays is studied using 3.6 million hadronic events recorded by the OPAL detector at LEP. The inclusive Z(0) to J/psi and b-quark to J/psi branching ratios are measured from the total yield of J/psi mesons, identified from their decays into lepton pairs. The J/psi momentum distribution is used to study the fragmentation of b-quarks. The production rate of psi' mesons, identified from their decays into a J/psi and a pi(+)pi(-) pair, is measured as well. The following results are obtained:Br(Z(0)-->J/psi X) = (3.9 +/- 0.2 +/- 0.3). 10(-3) and Br(Z(0)-->psi' X) = (1.6 +/- 0.3 +/- 0.2). 10(-3),where the first error is statistical and the second systematic. Finally the J/psi sample is used to reconstruct exclusive b-hadron decays and calculate the corresponding b-hadron branching ratios and masses.
Published: 1996
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33. A study of charm hadron production in $$Z^0 \to c\bar c$$ and $$Z^0 \to b\bar b$$ decays at LEPdecays at LEP

Author: S. R. Lautenschlager, H. A. Neal, T. Hilse, O. Runolfsson, C. Dallapiccola, James Pinfold, S. B. Anderson, O. Schaile, P. Szymanski, Michael Hildreth, H. Mes, I. P. Duerdoth, P. Fath, E. Lefebvre, C. Beeston, Claudio Grandi, G. Mikenberg, D. G. Fong, C. Lewis, Daniel Lellouch, Stefan Kluth, Shlomit Tarem, N. Altekamp, N. L. Rodning, Robert McPherson, M. Starks, J. Gascon, F. Odorici, B. Poli, Stan Bentvelsen, D. J. Miller, J. A. McKenna, Takehiko Mori, Silvia Arcelli, F. S. Merritt, Mathieu Doucet, S. M. Gascon-Shotkin, R. W. Springer, R. D. Heuer, Fabrizio Fabbri, U. Müller, M. Hapke, B. Stockhausen, Paul Kyberd, F. K. Loebinger, V. Zacek, A. Malik, A. I. McNab, J. Goldberg, B. Nellen, Shigenori Tanaka, Matthew Evans, A. M. Rossi, U. Jost, R. Mir, Hans-Christian Schultz-Coulon, A. J. Martin, P. Gagnon, P. E.L. Clarke, M. K. Jones, Michael Schulz, T. Tsukamoto, D. R. Rust, D. S. Koetke, H. M. Fischer, Marcello Mannelli, R. W.L. Jones, Gregor Herten, I. J. Bloodworth, J. Allison, Kiyotomo Kawagoe, J. Bechtluft, Dave Charlton, P. Igo-Kemenes, J. P. Martin, J. Steuerer, B. Wilkens, D. E. Hutchcroft, M. Tscheulin, S. De Jong, Guenter Duckeck, H. G. Evans, Achim Stahl, A. Sittler, A. M. Lee, S. A. Robins, Yoram Rozen, M. J. Goodrick, I. Cohen, E. A. Mckigney, M. Foucher, H. Jeremie, C. Hartmann, D. E. Plane, F. G. Oakham, R. E. Hughes-Jones, J. P. Pansart, Shlomo Dado, T. J. Smith, J. E. Pilcher, M. Tecchio, E. von Törne, P. Weber, P. Scharff-Hansen, D. Chrisman, B. Schmitt, E. L. Barberio, Volker Blobel, W. P. Lai, R. Bartoldus, D. Karlen, C. Burgard, G. W. Wilson, M. J. Oreglia, R. Bürgin, H. Przysiezniak, A. N. Bell, J. R. Carter, Georges Azuelos, A. S. Turcot, Stephen Hillier, G. M. Dallavalle, D. Rigby, R. J. Hemingway, H. O. Ogren, Christoph Geich-Gimbel, H. M. Bosch, V. Gibson, E. do Couto e Silva, Joleen Pater, R. J. Barlow, M. Hauschild, M. Fierro, J. E.G. Edwards, Stefan Schmitt, Ekg Sarkisyan, S. A. Wotton, P. W. Jeffreys, K. Stephens, T. Kobayashi, Gideon Bella, C. Markus, A. Rooke, Gunter Wolf, F. X. Gentit, R. Van Kooten, E. Tsur, C. H. Shepherd-Themistocleous, A. M. Smith, H. J. Burckhart, Jacqueline Batley, M. Verzocchi, Paolo Giacomelli, J. G. Layter, P. Poffenberger, R. Giacomelli, M. Hansroul, G. D. Lafferty, K. W. Bell, J. Pálinkás, Madjid Boutemeur, G. Vasseur, B. W. Kennedy, P. Jovanovic, G. T. Jones, E. H. Vokurka, C. Sbarra, P. Schütz, C. Charlesworth, C. K. Hargrove, S. L. Lloyd, J. E. Conboy, A. Fürtjes, R. Lahmann, Andris Skuja, Sven Menke, P. G. Estabrooks, R. K. Keeler, S. Petzold, G. D. Long, T. Omori, G. N. Patrick, Ehud Duchovni, Austin Ball, Peter Krieger, D. Axen, R. J. Homer, A. Jawahery, M. Jimack, Tetsuro Mashimo, P. Mättig, Shoji Asai, A. Gaidot, Matthias Schröder, Otmar Biebel, S. Braibant, Gabriella Pasztor, M. Sasaki, J. C. Hill, C. R. Jones, A. Michelini, J. J. Ward, P. Vikas, F. Wäckerle, D. M. Gingrich, D. C. Imrie, W. J. McDonald, G. P. Siroli, D. M. Strom, P. M. Watkins, G. G. Hanson, Manuella Vincter, Alessandro Montanari, W. R. Gibson, P. Pfeifenschneider, W. Gorn, Peter Sherwood, D. Lanske, P. Berlich, Alexander Wagner, B. C. Shen, G. Giacomelli, B. T. Bouwens, G. A. Snow, C. P. Ward, H. Fukui, J. Ludwig, C. Y. Chang, K. Runge, P. Bock, M. Thiergen, P. Schenk, S. Söldner-Rembold, Siegfried Bethke, J. Lauber, J. Letts, P. Taras, Michael Kobel, A. K. Honma, B. Nijjhar, R. Rylko, R. Kowalewski, M. S. Dixit, Frans Meijers, Norbert Wermes, Sherry Towers, T. Kawamoto, W. G. Scott, A. Joly, K. Ametewee, J. W. Gary, Gideon Alexander, Paolo Capiluppi, R. M. Brown, Lorne Levinson, S. Orito, F. Strumia, S. D. Talbot, M. Rosvick, Julie Kirk, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, S. W. O'Neale, N. I. Geddes, K. J. Anderson, Gilles Beaudoin, G. Yekutieli, A. Skillman, M. F. Turner-Watson, M. Morii, P. S. Wells, Terry Richard Wyatt, A. T. Watson, Peter R Hobson, J. E. Bloomer, P. Routenburg, Sachio Komamiya, Tara Shears, Theodoros Geralis, M. Gruwe, E. Ros, T. P. Kokott, A. Luig, R. J. Sobie, T. R. Junk, R. G. Kellogg, M. Steiert, Csaba Hajdu, Stefano Marcellini, R. Howard, J. S. White, P. A. Hart, Reda Tafirout, Klaus Kurt Desch, M. J. Pearce, D. R. Ward, H. Lafoux, T. Kress, J. Hoare, U. Ruppel, M. R. Ingram, A. A. Carter, Ron Folman, B. J. King, P. Utzat, Frank Fiedler, T. J. McMahon, T. Behnke, R. K. Carnegie, J. A. Wilson, C. M. Hawkes, Richard Nisius, Marco Cuffiani, S. L. Chu, D. Lazic, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, D. L. Rees, F. Scharf, German Martinez, A. D. Schaile, W. Matthews, M. A. Thomson, E. K. U. Gross, T. Wlodek, M. Sproston, Satoru Yamashita, N. K. Watson, J. M. Roney, W. Mohr, and A. Posthaus
Subjects: Nuclear physics, Physics, Quark, Partial width, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hadron, Decay length, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Measurements of the production of the weakly decaying charmed hadrons: D0, D+, Ds+ andΛc+ in both$Z^0 \to c\bar c$ and$Z^0 \to b\bar b$ events are reported. By summing the partial contributions from each of these states we measure the partial width for Z0 decays into a$c\bar c$ pair as: $$\frac{{\Gamma _{c\bar c} }}{{\Gamma _{had} }} = 0.167 \pm 0.011(stat) \pm 0.011(sys) \pm 0.005(br)$$ where the errors are statistical, systematic and due to the uncertainties in the charmed hadron branching ratios, respectively. The relative production rates for the formation of the charmed hadrons from primaryc quarks is found to be in good agreement with continuum e+e− data at √s≈10 GeV.
Published: 1996
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34. Search for a narrow resonance in Z0 decays into hadrons and isolated photons

Author: M. Hapke, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, O. C. Cooke, R. Bartoldus, T. P. Kokott, A. Luig, Daniel Lellouch, H. O. Ogren, A. Joly, H. M. Fischer, M. J. Oreglia, Christoph Geich-Gimbel, Takehiko Mori, P. S. Wells, V. Zacek, Koji Yoshimura, P. Weber, J. E. Bloomer, W. J. McDonald, A. Michelini, J. von Krogh, B. C. Shen, Andris Skuja, D. Axen, A. Jawahery, F. X. Gentit, J. E. Conboy, A. Fürtjes, Peter Sherwood, E. Lefebvre, S. Yamashita, P. Igo-Kemenes, I. J. Bloodworth, S. Petzold, G. D. Long, R. J. Hawkings, Alexander Wagner, F. Odorici, P. A. Hart, J. Lauber, H. Jeremie, G. N. Patrick, Silvia Arcelli, J. Ludwig, K. Runge, P. Bock, F. Strumia, Gunter Wolf, P. Gagnon, S. A. Robins, D. L. Rees, Tetsuro Mashimo, R. E. Hughes-Jones, J. Allison, B. Nijjhar, Siegfried Bethke, A. K. Honma, M. J. Pearce, A. Sittler, B. Stockhausen, Paul Kyberd, F. K. Loebinger, L. A. del Pozo, D. E. Hutchcroft, C. Dallapiccola, J. Steuerer, Yoram Rozen, M. F. Turner-Watson, H. M. Bosch, F. Scharf, German Martinez, R. Van Kooten, M. Foucher, E. A. Mckigney, Otmar Biebel, M. Morii, Peter R Hobson, T. J. McMahon, Joleen Pater, V. Gibson, S. L. Chu, J. R. Carter, W. Gorn, W. G. Scott, A. D. Schaile, F. S. Merritt, R. Giacomelli, W. P. Lai, N. Altekamp, W. Matthews, P. Routenburg, R. Howard, J. S. White, N. J. Oldershaw, Junichi Kanzaki, D. Karlen, C. Burgard, E. do Couto e Silva, J. Schwiening, J. P. Pansart, R. K. Carnegie, S. Wotton, M. A. Thomson, Dave Charlton, T. R. Wyatt, A. S. Turcot, D. J. Miller, R. J. Barlow, J. M. Roney, S. M. Gascon-Shotkin, C.J. Beeston, T. G. Shears, U. Müller, H. Mes, J. Bechtluft, R. Lahmann, D. C. Imrie, J. A. McKenna, M. Palazzo, I. P. Duerdoth, A. J. Martin, G. D. Lafferty, A. Gaidot, J. A. Wilson, R. Bürgin, S. G. Clowes, A. I. McNab, Sven Menke, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, T. Wlodek, D. Chrisman, M. Sproston, P. Fath, J. Goldberg, F. Wäckerle, J. Letts, M. Fierro, J. E.G. Edwards, Ekg Sarkisyan, G. P. Siroli, J. King, O. Schaile, D. M. Gingrich, P. W. Jeffreys, D. M. Strom, D. Rigby, R. J. Hemingway, Madjid Boutemeur, Volker Blobel, T. Behnke, B. Nellen, G. Giacomelli, Norbert Wermes, Eilam Gross, Sherry Towers, T. Kawamoto, P. Scharff-Hansen, C. K. Hargrove, B. W. Kennedy, C. Darling, T. J. Smith, Matthew Evans, M. Starks, P. Berlich, Gideon Bella, N. Tesch, M. Gruwé, P. Jovanovic, S. Orito, C. H. Shepherd-Themistocleous, H. J. Burckhart, M. Rosvick, Jacqueline Batley, Austin Ball, P. Bright-Thomas, A. M. Rossi, Matthias Schröder, P. G. Estabrooks, R. K. Keeler, C. Sbarra, Peter Krieger, P. Mättig, R. W. Springer, H. G. Evans, H. Fukui, R. Rylko, Richard Nisius, M. Thiergen, Stephen Lloyd, J. J. Ward, Manuella Vincter, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, M. J. Goodrick, I. Cohen, Alessandro Montanari, Hans-Christian Schultz-Coulon, Robert M Brown, Shoji Asai, Marco Cuffiani, T. Omori, P. Vikas, H. Lafoux, D. Lanske, A. M. Smith, G. W. Wilson, G. Vasseur, M. Hauschild, P. M. Watkins, Randall Sobie, Georges Azuelos, E. Tsur, Michael Schulz, C. M. Hawkes, U. Jost, R. Mir, R. D. Heuer, N. K. Watson, Fabrizio Fabbri, B. Lorazo, N. I. Geddes, Michael Hildreth, C. Markus, M. Verzocchi, K. W. Bell, Ehud Duchovni, G. Yekutieli, N. L. Rodning, J. C. Hill, Misao Sasaki, T. Hilse, H. Takeda, D. R. Rust, E. H. Vokurka, O. Runolfsson, M. Jimack, James Pinfold, B. Poli, D. G. Fong, C. Lewis, F. G. Oakham, Stefan Kluth, E. L. Barberio, Shlomit Tarem, J. Gascon, A. M. Lee, A. A. Carter, Ron Folman, F. Palmonari, Roger Jones, M. Tecchio, E. von Törne, W. Mohr, S. W. Gensler, Gregor Herten, A. Posthaus, Claudio Grandi, A. Malik, J. W. Gary, T. Kobayashi, Guenter Duckeck, B. Wilkens, D. S. Koetke, Marcello Mannelli, J. E. Pilcher, P. Utzat, M. G. Rison, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, S. B. Anderson, P. Szymanski, Stan Bentvelsen, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, J. G. Layter, C. Charlesworth, W. R. Gibson, Stefania Xella, B. T. Bouwens, J. Palinkas, Shlomo Dado, G. G. Hanson, Lorne Levinson, Giora Mikenberg, P. D. Phillips, P. Schenk, S. Braibant, Gabriella Pasztor, M. S. Dixit, Frans Meijers, Gilles Beaudoin, G. A. Snow, C. P. Ward, P. E.L. Clarke, M. K. Jones, A. Skillman, S. Söldner-Rembold, Paolo Giacomelli, J. P. Martin, M. Tscheulin, M. Hansroul, S. De Jong, H. Przysiezniak, A. N. Bell, Reda Tafirout, R. J. Homer, Achim Stahl, C. Y. Chang, B. Schmitt, P. Taras, Michael Kobel, Julie Kirk, P. Poffenberger, P. Schütz, S. W. O'Neale, K. J. Anderson, K. Stephens, D. R. Ward, T. Kress, and Frank Fiedler
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Scalar (mathematics), Bottom quark, Resonance (particle physics), Standard Model, Nuclear physics, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: A search for the hadronic decay of a hypothetical resonance S0 in the process e+e−→γ + hadrons at Z0 energies is reported. Particular care is taken to optimise the sensitivity to a scalar resonance decaying into bottom quarks, as expected for Higgs production, e+e−→Z0→H0γ with$H^0 \to b\bar b$, in the Standard Model or some of its extensions. No evidence for such a resonance is observed in a sample of about 5 million produced Z0’s. The results are interpreted in terms of models of non-standard Higgs production. An update of a search for a resonance produced in association with hadrons and the subsequent resonance decay into two photons is also presented.
Published: 1996
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35. Measurement of the branching ratio

Author: F. S. Merritt, Otmar Biebel, D. L. Wagner, D. E. Hutchcroft, C. Dallapiccola, O. C. Cooke, I. J. Bloodworth, J. Bechtluft, D. M. Strom, C. Stegmann, H. M. Fischer, H. Fukui, R. Rylko, Margret Fincke-Keeler, A. Michelini, D. R. Rust, J. von Krogh, Yoram Rozen, R. W. Springer, R. Lahmann, D. C. Imrie, M. Palazzo, J. Letts, M. Foucher, R. J. Sobie, N. Altekamp, R. Howard, P. E.L. Clarke, Norbert Wermes, Sherry Towers, J. P. Pansart, S. Braibant, Gabriella Pasztor, P. Gagnon, R. J. Hawkings, T. Kawamoto, R. Bartoldus, E. Lefebvre, G. P. Siroli, J. King, P. Igo-Kemenes, M. K. Jones, W. Matthews, A. M. Lee, T. Behnke, J. Steuerer, S. A. Robins, P. S. Wells, J. Allison, D. J. Miller, H. O. Ogren, A. T. Watson, J. P. Martin, S. Orito, L. A. del Pozo, J. E. Bloomer, Joleen Pater, C. Y. Chang, H. Jeremie, M. Tscheulin, M. A. Thomson, M. Rosvick, Christoph Geich-Gimbel, P. Scharff-Hansen, Stefan Kluth, Shlomit Tarem, M. Tecchio, E. von Törne, A. Sittler, C. Burgard, F. Odorici, S. De Jong, Sachio Komamiya, Theodoros Geralis, Georges Azuelos, D Darlen, J. R. Carter, R. E. Hughes-Jones, C. P. Ward, E. K. U. Gross, Gideon Bella, A. Gaidot, T. Wlodek, M. Sproston, C. H. Shepherd-Themistocleous, C. Sbarra, C. J. Oram, E. Ros, W. R. Gibson, S. L. Lloyd, F. X. Gentit, Gregor Herten, P. Taras, E. Tsur, A. Joly, S. Söldner-Rembold, H. M. Bosch, A. S. Turcot, Michael Kobel, M. Hapke, J. E. Conboy, A. Fürtjes, H. J. Burckhart, Jacqueline Batley, K. W. Bell, G. Yekutieli, T. P. Kokott, C. Darling, V. Gibson, A. Luig, N. I. Geddes, J. A. McKenna, B. Wilkens, J. C. Hill, B. T. Bouwens, N. Tesch, H. Przysiezniak, A. M. Smith, Michael Hildreth, Paolo Giacomelli, G.A Show, Gunter Wolf, Silvia Arcelli, Satoru Yamashita, M. Hansroul, W.J. McDonald, D. Rigby, R. J. Hemingway, A. A. Carter, Ron Folman, A. N. Bell, E. do Couto e Silva, U. Müller, T. J. Smith, N. L. Rodning, K. Stephens, G. Vasseur, B. Lorazo, B. Poli, R. M. Brown, D. Axen, Lorne Levinson, A. Jawahery, P. Mättig, Richard Nisius, M. J. Oreglia, S. Wotton, J. E. Pilcher, T. Omori, Shoji Asai, B. W. Kennedy, B. J. King, C. M. Hawkes, P. D. Phillips, Julie Kirk, T. Hilse, O. Schaile, B. C. Shen, Andris Skuja, A. J. Martin, J. Palinkas, Peter Sherwood, Marco Cuffiani, Daniel Lellouch, H. Mes, N. J. Oldershaw, D. L. Rees, Shlomo Dado, I. P. Duerdoth, P. Fath, G. D. Long, R. J. Homer, R. G. Kellogg, P. Utzat, Gilles Beaudoin, A. Skillman, P. Jovanovic, Austin Ball, M. G. Rison, Alexander Wagner, Csaba Hajdu, Peter Krieger, Takehiko Mori, Sven Menke, Siegfried Bethke, Tetsuro Mashimo, J. Ludwig, K. Runge, P. Bock, A. K. Honma, A. I. McNab, J. Goldberg, G. N. Patrick, F. Scharf, S. B. Anderson, B. Nellen, German Martinez, Stefano Marcellini, S. M. Gascon-Shotkin, T. J. McMahon, Manuella Vincter, J. Schwiening, G. G. Hanson, Alessandro Montanari, M. F. Turner-Watson, P. Szymanski, O. Runolfsson, M. Morii, Peter R Hobson, W. G. Scott, R. D. Heuer, G. A. Beck, Achim Stahl, J. Lauber, J. W. Gary, B. Stockhausen, Paul Kyberd, Reda Tafirout, F. K. Loebinger, Fabrizio Fabbri, A. D. Schaile, R. Van Kooten, S. L. Chu, F. Strumia, H. G. Evans, M. J. Goodrick, I. Cohen, N. K. Watson, G. Mikenberg, U. Jost, R. K. Carnegie, R. Mir, J. A. Wilson, P. Poffenberger, Dave Charlton, R. Giacomelli, C. K. Hargrove, P. Routenburg, P. Schütz, W. Gorn, D. R. Ward, T. Kress, P. Weber, Stan Bentvelsen, Dezso Horvath, U. C. Dunwoody, Claudio Grandi, B. Schmitt, J. M. Roney, P. A. Hart, G. Giacomelli, P. Schenk, M. Starks, C.J. Beeston, M. J. Losty, Jean-Arcady Meyer, T. G. Shears, E. A. Mckigney, Abish Malik, Ekg Sarkisyan, P. W. Jeffreys, B. Nijjhar, T. Kobayashi, H. Takeda, C. Hartmann, D. E. Plane, F. Wäckerle, R. Bürgin, B. Fabbro, M. Sasaki, D. M. Gingrich, M. S. Dixit, Frans Meijers, M. J. Pearce, G. M. Dallavalle, W. P. Lai, F. G. Oakham, G. W. Wilson, W. Mohr, P. Berlich, James Pinfold, M. Hauschild, Hans-Christian Schultz-Coulon, A. Posthaus, P. Bright-Thomas, Michael Schulz, E. L. Barberio, A. M. Rossi, D. G. Fong, C. Lewis, J. Gascon, Frank Fiedler, D. Hochman, J. J. Ward, T. Tsukamoto, P. Vikas, D. Lanske, C. Markus, Matthias Schröder, T. W. Pritchard, V. Zacek, H. Lafoux, T. R. Wyatt, D. S. Koetke, G. D. Lafferty, Guenter Duckeck, R. J. Barlow, Marcello Mannelli, R. W.L. Jones, Madjid Boutemeur, S. G. Clowes, M. Fierro, J. E.G. Edwards, J. G. Layter, S. W. O'Neale, E. H. Vokurka, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, C. Charlesworth, K. J. Anderson, Stefania Xella, D. Chrisman, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, M. Jimack, S. W. Gensler, and S. J. Hillier
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Branching fraction, Electron–positron annihilation, Detector, Weak interaction, Charged current, Universality (dynamical systems)
Abstract: The branching ratio of the τ− → e−νeντ decay mode has been measured with the OPAL detector to be (17.78 ± 0.10 ±0.09)% where the first error is statistical and the second is systematic. The branching ratio, together with other measurements, has been used to test e — μ and μ — τ universality in the charged current weak interaction.
Published: 1996
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36. Measurement of the average b-baryon lifetime and the product branching ratio {\boldmath {{f({\mathrm{b}} \rightarrow \Lambda_{\mathrm{b}}) \cdot BR(\Lambda_{\mathrm{b}} \rightarrow \Lambda \ell^- \bar{\nu} \mathrm{X})}}}

Author: G. G. Hanson, G. Giacomelli, P. Schenk, Frans Meijers, A. I. McNab, J. Goldberg, J. G. Layter, Dixit, C. Charlesworth, O. C. Cooke, N. K. Watson, S. M. Gascon-Shotkin, P. W. Jeffreys, T. Kobayashi, B. Nellen, P. G. Estabrooks, U. C. Dunwoody, Margret Fincke-Keeler, A. M. Lee, M. Tscheulin, Eduardo Ros, Abish Malik, D. Rigby, R. J. Hemingway, Robert Lahmann, I. P. Duerdoth, J.P. Martin, D. Axen, H. Przysiezniak, P. Fath, C. Hartmann, Otmar Biebel, Gideon Bella, P. M. Watkins, C. Darling, T. J. Smith, R. Bartoldus, H. G. Evans, M. J. Goodrick, I. Cohen, H. J. Burckhart, D.L. Wagner, P. Jovanovic, Peter Krieger, A. Jawahery, A. M. Rossi, H. Deng, A. Stahl, S. B. Anderson, T. Tsukamoto, J. von Krogh, Ehud Duchovni, Jacqueline Batley, P. Igo-Kemenes, J. W. Gary, H. O. Ogren, S. L. Chu, T. Kress, O. Runolfsson, Alan Watson, M. J. Kobel, P. Mättig, J. Ludwig, J. J. Ward, D. Lanske, Doug Gingrich, H. Jeremie, Manuella Vincter, Alessandro Montanari, Shlomo Dado, K. Runge, P. Bock, Christoph Geich-Gimbel, R. J. Hawkings, A. H. Ball, Silvia Arcelli, S. J. De Jong, Shoji Asai, L. A. del Pozo, James Pinfold, R. E. Hughes-Jones, D. E. Hutchcroft, C. Dallapiccola, J. M. Roney, S. W. Gensler, W. R. Gibson, David G. Charlton, E. Lefebvre, H. Mes, H. Fischer, G. Mikenberg, S. W. O'Neale, Georges Azuelos, B. Stockhausen, F. K. Loebinger, J. D. Gillies, D. G. Fong, Daniel Lellouch, T. J. McMahon, S. J. Hillier, Carla Sbarra, S. Komamiya, T. R. Wyatt, Kiyotomo Kawagoe, C. M. Hawkes, A. K. Honma, J.A. Lauber, J. Schwiening, J. Gascon, Takehiko Mori, F. Odorici, V. Gibson, C.J. Beeston, Sherry Towers, G. Duckeck, R. K. Carnegie, A. P. Wagner, K. W. Bell, N. Altekamp, E. A. Mckigney, N. L. Rodning, T. Kawamoto, Frank Fiedler, S. G. Clowes, M. Boutemeur, Stan Bentvelsen, Norbert Wermes, E. do Couto e Silva, J. C. Hill, D. J. Miller, A. Beck, M. Fierro, J. E.G. Edwards, Eugene P. Gross, F. Wäckerle, J. A. McKenna, J. A. Wilson, B. Poli, M. W. Redmond, M. F. Turner-Watson, Peter Sherwood, P. E. L. Clarke, F. X. Gentit, M. Morii, B. C. Shen, Peter R Hobson, W. Mohr, W. P. Lai, V. Zacek, R. Kowalewski, J. E. Conboy, K. J. Anderson, S. Orito, J. C. Clayton, A. Posthaus, D. C. Imrie, A. Fürtjes, Siegfried Bethke, Gy. Wolf, P. Berlich, D. Karlen, P. Gagnon, Thomson, T. Geralis, Rick J. Van Kooten, Sven Menke, P. Szymanski, Stefan Kluth, M. Rosvick, Shlomit Tarem, M. Tecchio, Lorne Levinson, W. G. Scott, P. Weber, R. Giacomelli, T. Hilse, I. J. Bloodworth, G. P. Siroli, J. King, K. Ametewee, P. D. Phillips, O. Schaile, M. Hapke, G. T. Zorn, G. D. Lafferty, Marcello Mannelli, J. E. Duboscq, A. Michelini, Gideon Alexander, Paolo Capiluppi, Hans-Christian Schultz-Coulon, P. Kyberd, C. J. Oram, B. W. Kennedy, Pedro Teixeira-Dias, Robert Wayne Springer, Paolo Giacomelli, H. M. Bosch, M. Hansroul, Gilles Beaudoin, T. P. Kokott, A. Luig, J. Steuerer, Andris Skuja, M. Settles, Michael Schulz, Wolfram Dietrich Zeuner, Roger Barlow, M. J. Losty, Claudio Grandi, F. Palmonari, G. D. Long, F. S. Merritt, Yoram Rozen, Fabrizio Fabbri, S. A. Robins, G. A. Snow, C. P. Ward, Tetsuro Mashimo, Carsten Daniel Burgard, M. Foucher, M. Jimack, John Allison, K. Stephens, T. W. Pritchard, P. Vikas, Matthew Jones, M. J. Oreglia, C. H. Shepherd-Themistocleous, D. R. Rust, G. Yekutieli, F. Scharf, G. W. Wilson, G.Marco Dallavalle, P. Schütz, D. L. Rees, S. Söldner-Rembold, S. Braibant, T. Behnke, J. R. Carter, Junichi Kanzaki, R. J. Homer, Stephen Lloyd, E. von Törne, Robert M Brown, Reda Tafirout, W. Gorn, A. A. Carter, J. Bechtluft, M. Sasaki, Ron Folman, W. Matthews, R. W. L. Jones, Marco Cuffiani, R. G. Kellogg, A. Skillman, G. N. Patrick, C. Y. Chang, A. Gaidot, B. J. King, A. D. Schaile, A. S. Turcot, D. R. Ward, P. Taras, P. Scharff-Hansen, D. S. Koetke, T. Wlodek, M. Sproston, P. Utzat, Marcello Fanti, Julie Kirk, G. A. Beck, P. Routenburg, N. Tesch, R. Bürgin, Stefano Marcellini, B. Fabbro, James Letts, A. M. Smith, G. Vasseur, B. Lorazo, M. G. Rison, A. Joly, N. I. Geddes, D. Hochman, B. Schmitt, Gregor Herten, B. Wilkens, J. E. Pilcher, N. J. Oldershaw, R.J. Akers, M. Starks, M. Hauschild, S. A. Wotton, C. Markus, P. S. Wells, David E. Plane, P R Poffenberger, P.G. Bright-Thomas, A. Buijs, D. M. Strom, C. Stegmann, H. Fukui, Richard Keeler, R. J. Sobie, R. Howard, R. Mir, Matthias Schröder, R. D. Heuer, H. Lafoux, F. G. Oakham, P.A. Hart, J. P. Pansart, U. Müller, A. J. Martin, E. L. Barberio, C. K. Hargrove, Tara Shears, B. Nijjhar, and M. J. Pearce
Subjects: Physics, Baryon, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Product (mathematics), Electron–positron annihilation, Bibliography, Neutrino, Lambda
Published: 1996
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37. Measurement of the average b-baryon lifetime and the product branching ratio $$f(b \to \Lambda _b ) \cdot BR(\Lambda _b \to \Lambda \ell ^ - \bar vX)$$

Author: R. Lahmann, D. C. Imrie, C. Y. Chang, P. Taras, Michael Kobel, G. P. Siroli, J. King, I. J. Bloodworth, O. C. Cooke, S. L. Chu, Stefan Kluth, M. Hapke, D. Axen, A. Jawahery, Shlomit Tarem, J. C. Clayton, M. Settles, Julie Kirk, H. Lafoux, R. Kowalewski, D. E. Hutchcroft, Gideon Bella, C. J. Oram, G. W. Wilson, P. Igo-Kemenes, Yoram Rozen, J. von Krogh, M. Hauschild, H. J. Burckhart, Jacqueline Batley, H. Mes, K. Stephens, M. Foucher, M. J. Oreglia, H. Jeremie, K. Ametewee, C. Markus, R. E. Hughes-Jones, R. J. Hawkings, R. Bartoldus, Peter Sherwood, V. Gibson, Tara Shears, Alexander Wagner, Frank Fiedler, D. Hochman, Gunter Wolf, F. X. Gentit, Gideon Alexander, Paolo Capiluppi, L. A. del Pozo, I. P. Duerdoth, Kiyotomo Kawagoe, P. Fath, Junichi Kanzaki, D. Karlen, H. O. Ogren, Christoph Geich-Gimbel, D. R. Ward, T. Kress, T. J. McMahon, J. Schwiening, P. S. Wells, U. C. Dunwoody, P. A. Hart, J. Ludwig, P. Poffenberger, K. Runge, P. Bock, R. K. Carnegie, C. Burgard, E. do Couto e Silva, N. J. Oldershaw, R.J. Akers, J. R. Carter, Terry Richard Wyatt, G. N. Patrick, J. A. Wilson, M. J. Pearce, Ehud Duchovni, J. Steuerer, P. Schütz, S. Wotton, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Sven Menke, P. Weber, O. Schaile, S. G. Clowes, S. B. Anderson, P. Szymanski, A. Gaidot, P. Scharff-Hansen, M. Fierro, J. E.G. Edwards, Otmar Biebel, D. L. Wagner, R. W. Springer, M. Jimack, J. E. Conboy, A. Fürtjes, Sachio Komamiya, Theodoros Geralis, A. I. McNab, J. Goldberg, H. Deng, S. Braibant, P. W. Jeffreys, M. Starks, E. Ros, A. T. Watson, A. J. Martin, B. Nellen, D. L. Rees, J. Letts, F. Palmonari, Silvia Arcelli, S. W. Gensler, S. J. Hillier, T. Kobayashi, Georges Azuelos, Norbert Wermes, Sherry Towers, R. Giacomelli, F. Scharf, A. M. Smith, T. Kawamoto, F. S. Merritt, C. Darling, P. Bright-Thomas, T. J. Smith, C. Sbarra, Matthias Schröder, G. A. Snow, C. P. Ward, E. Lefebvre, Stan Bentvelsen, G. Vasseur, S. Orito, B. Lorazo, M. Rosvick, Marco Cuffiani, S. W. O'Neale, K. W. Bell, K. J. Anderson, A. D. Schaile, H. G. Evans, M. J. Goodrick, S. Söldner-Rembold, I. Cohen, T. P. Kokott, A. Luig, Andris Skuja, P. Gagnon, A. Buijs, F. Odorici, D. M. Strom, J. C. Hill, Misao Sasaki, G. Yekutieli, Dave Charlton, J. J. Ward, P. Vikas, D. Lanske, P. Mättig, Shoji Asai, B. C. Shen, G. D. Long, Tetsuro Mashimo, Paolo Giacomelli, M. Hansroul, A. A. Carter, C. Stegmann, J. A. McKenna, Gregor Herten, Siegfried Bethke, A. Joly, Ron Folman, Roger Jones, Shlomo Dado, N. K. Watson, Gordon H. Hanson, A. K. Honma, Stephen Lloyd, B. Nijjhar, G. T. Zorn, W. G. Scott, M. Tecchio, C. M. Hawkes, B. Wilkens, G. Giacomelli, A. S. Turcot, B. J. King, H. Fukui, P. Utzat, R. Bürgin, B. Fabbro, M. W. Redmond, M. G. Rison, C. H. Shepherd-Themistocleous, E. A. Mckigney, J. Bechtluft, M. F. Turner-Watson, J. P. Pansart, T. Hilse, M. Morii, W. Gorn, H. M. Bosch, Wolfram Dietrich Zeuner, John Allison, P. Schenk, Peter R Hobson, Giora Mikenberg, Daniel Lellouch, Takehiko Mori, J. E. Pilcher, N. I. Geddes, R. J. Homer, O. Runolfsson, P. Routenburg, U. Müller, M. J. Losty, R. G. Kellogg, W. Mohr, A. Posthaus, W. P. Lai, M. S. Dixit, Stefano Marcellini, N. L. Rodning, C. Beeston, James Pinfold, Claudio Grandi, B. Poli, D. G. Fong, W. Matthews, M. A. Thomson, Frans Meijers, J. Gascon, V. Zacek, G. A. Beck, C. K. Hargrove, E. K. U. Gross, A. Malik, T. Wlodek, R. Howard, Achim Stahl, P. Teixeira-Dias, M. Sproston, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, J. M. Roney, T. Tsukamoto, N. Tesch, T. Behnke, S. M. Gascon-Shotkin, J. G. Layter, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, B. Schmitt, Madjid Boutemeur, C. Charlesworth, Margret Fincke-Keeler, T. W. Pritchard, P. E.L. Clarke, M. K. Jones, J. P. Martin, P. G. Estabrooks, M. Tscheulin, R. K. Keeler, Guenter Duckeck, S. De Jong, A. M. Rossi, H. Przysiezniak, P. M. Watkins, H. M. Fischer, A. Michelini, S. A. Robins, C. Dallapiccola, J. D. Gillies, N. Altekamp, R. J. Barlow, D. J. Miller, R. Mir, J. Lauber, F. G. Oakham, E. L. Barberio, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, D. R. Rust, C. Hartmann, D. E. Plane, G. M. Dallavalle, A. M. Lee, E. von Törne, W. R. Gibson, A. Beck, R. Van Kooten, R. M. Brown, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, F. Wäckerle, Reda Tafirout, D. M. Gingrich, P. Berlich, M. Fanti, R. D. Heuer, and Fabrizio Fabbri
Subjects: Physics, Quark, Particle physics, Muon, Physics and Astronomy (miscellaneous), Branching fraction, High Energy Physics::Phenomenology, Lambda, Baryon, Nuclear physics, High Energy Physics::Experiment, Baryon number, Impact parameter, Nuclear Experiment, Lepton
Abstract: The average lifetime of b-flavoured baryons measured with the OPAL detector is updated to include data collected between 1990 and 1994 at LEP. Bottom-flavoured baryons that decay semileptonically and produce aΛ baryon are identified through the correlation of the baryon number of theΛ and the electric charge of the lepton. To measure the lifetime, the decay point of the b baryon is estimated by theΛ-lepton vertex, and the observed distribution of decay lengths is fitted simultaneously in 874 right-sign and 384 wrong-sign combinations. In a separate method, the impact parameter distribution of the leptons is fitted in a subset of these data. When the two results are combined, taking correlations into account, the average b-baryon lifetime is found to be τ=1.16±0.11(stat.)±0.06(syst.) ps. Using the same data, the product branching ratio is measured to be$\begin{gathered} \hfill f(b \to \Lambda _b ) \cdot BR(\Lambda _b \to \Lambda \ell ^ - \bar vX) = (2.91 \pm 0.23(stat.) \\ \hfill \pm 0.25(stat.)) \cdot 10^{ - 3} \\ \end{gathered} $, where the symbolf(b→Λb) is the fraction of b quarks from Z0 decays forming b baryons,Λb represents all b-flavoured baryons and l is either an electron or a muon.
Published: 1995
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38. A study of QCD structure constants and a measurement of $$\alpha _s (M_{Z^0 } )$$ at LEP using event shape observables

Author: S. Braibant, H. M. Fischer, T. J. McMahon, Otmar Biebel, A. Michelini, D. L. Wagner, Gunter Wolf, F. X. Gentit, G. A. Snow, C. P. Ward, H. Deng, S. Söldner-Rembold, Reda Tafirout, S. A. Robins, P. E.L. Clarke, R. Kowalewski, J. Schwiening, M. K. Jones, G. W. Wilson, J. Letts, Frank Fiedler, D. Hochman, M. Hauschild, R. Lahmann, D. C. Imrie, J. P. Martin, E. Lefebvre, Norbert Wermes, Sherry Towers, C. Markus, R. K. Carnegie, Andris Skuja, M. Tscheulin, S. De Jong, N. J. Oldershaw, J. A. Wilson, R.J. Akers, O. Schaile, T. Kawamoto, Paolo Giacomelli, C. M. Hawkes, M. Starks, K. Ametewee, K. Stephens, F. Odorici, Daniel Lellouch, Madjid Boutemeur, M. Hansroul, S. Wotton, Matthias Schröder, Takehiko Mori, Shlomo Dado, Gideon Alexander, Paolo Capiluppi, G. P. Siroli, J. King, M. Fanti, W. R. Gibson, S. Orito, M. Rosvick, G. D. Long, Tetsuro Mashimo, P. G. Estabrooks, R. K. Keeler, V. Gibson, H. Przysiezniak, C. H. Shepherd-Themistocleous, V. Zacek, R. J. Homer, J. Steuerer, A. Beck, Gregor Herten, B. Wilkens, Lorne Levinson, J. P. Pansart, M. Hapke, R. W. Springer, J. E. Pilcher, R. Bartoldus, C. Dallapiccola, Eilam Gross, C. Sbarra, Margret Fincke-Keeler, P. M. Watkins, J. D. Gillies, P. D. Phillips, Gilles Beaudoin, Giora Mikenberg, A. Skillman, T. Hilse, D. E. Hutchcroft, W. Gorn, Hans-Christian Schultz-Coulon, D. R. Ward, T. Kress, A. M. Rossi, N. K. Watson, O. Runolfsson, Ehud Duchovni, M. Jimack, P. S. Wells, G. Yekutieli, Randall Sobie, Michael Schulz, G. D. Lafferty, R. D. Heuer, U. Müller, C. Hartmann, D. E. Plane, A. I. McNab, P. Igo-Kemenes, Georges Azuelos, M. J. Oreglia, T. Tsukamoto, Fabrizio Fabbri, G. G. Hanson, A. J. Martin, H. O. Ogren, F. Palmonari, J. C. Clayton, Silvia Arcelli, D. Axen, Christoph Geich-Gimbel, S. W. Gensler, S. J. Hillier, C. Darling, T. J. Smith, Terry Richard Wyatt, A. A. Carter, Ron Folman, T. Kobayashi, N. Altekamp, R. Van Kooten, Roger Jones, Kiyotomo Kawagoe, G. M. Dallavalle, T. W. Pritchard, J. Goldberg, K. W. Bell, H. Mes, C. Beeston, R. J. Barlow, H. Jeremie, J. R. Carter, G. N. Patrick, J. C. Hill, P. Scharff-Hansen, P. Schenk, N. I. Geddes, Claudio Grandi, Misao Sasaki, A. Jawahery, Marco Cuffiani, B. Stockhausen, Paul Kyberd, F. K. Loebinger, P. W. Jeffreys, P. Mättig, Shoji Asai, I. P. Duerdoth, P. Fath, Dave Charlton, Sachio Komamiya, Theodoros Geralis, Guenter Duckeck, B. Nellen, B. C. Shen, D. J. Miller, S. W. O'Neale, R. E. Hughes-Jones, N. L. Rodning, E. Ros, A. T. Watson, M. S. Dixit, W. Mohr, Siegfried Bethke, A. K. Honma, B. Nijjhar, A. M. Smith, Frans Meijers, W. G. Scott, F. Wäckerle, B. Poli, E. A. Mckigney, D. M. Gingrich, K. J. Anderson, J. E. Conboy, S. L. Chu, A. Fürtjes, A. Posthaus, B. J. King, P. Utzat, M. G. Rison, A. Buijs, C. K. Hargrove, G. A. Beck, P. Weber, Achim Stahl, P. Teixeira-Dias, T. P. Kokott, A. Luig, Peter Sherwood, G. Vasseur, B. Lorazo, Tara Shears, E. do Couto e Silva, W. P. Lai, Alexander Wagner, P. Berlich, D. M. Strom, R. Bürgin, B. Fabbro, C. Stegmann, I. J. Bloodworth, Stephen Lloyd, W. Matthews, P. Bright-Thomas, F. S. Merritt, J. Ludwig, G. Giacomelli, O. C. Cooke, A. S. Turcot, H. Fukui, P. Poffenberger, U. C. Dunwoody, H. G. Evans, B. Schmitt, M. A. Thomson, M. J. Goodrick, James Pinfold, P. A. Hart, Sven Menke, D. G. Fong, J. Gascon, M. J. Losty, D. R. Rust, D. Rigby, R. J. Hemingway, M. Tecchio, Robert M Brown, J. M. Roney, J. J. Ward, P. Vikas, Gideon Bella, K. Runge, P. Bock, H. J. Burckhart, J. G. Layter, Jacqueline Batley, M. Settles, Yoram Rozen, M. Foucher, P. Schütz, R. Giacomelli, I. Cohen, M. J. Pearce, D. Lanske, A. M. Lee, A. Malik, J. W. Gary, D. S. Koetke, C. Charlesworth, B. W. Kennedy, P. Jovanovic, J. Bechtluft, J. A. McKenna, Austin Ball, E. von Törne, J. von Krogh, A. Gaidot, T. Wlodek, Marcello Mannelli, J. E. Duboscq, M. Sproston, Peter Krieger, Manuella Vincter, R. J. Hawkings, L. A. del Pozo, C. Y. Chang, D. Karlen, C. Burgard, Alessandro Montanari, P. Taras, R. Mir, R. Howard, N. Tesch, T. Behnke, S. B. Anderson, Stefan Kluth, Shlomit Tarem, P. Szymanski, Michael Kobel, J. Lauber, P. Gagnon, C. J. Oram, Julie Kirk, H. Lafoux, S. G. Clowes, D. L. Rees, Stan Bentvelsen, M. Fierro, J. E.G. Edwards, F. Scharf, F. G. Oakham, G. T. Zorn, A. D. Schaile, E. L. Barberio, H. M. Bosch, Wolfram Dietrich Zeuner, A. Joly, M. F. Turner-Watson, M. Morii, M. W. Redmond, Peter R Hobson, P. Routenburg, John Allison, R. G. Kellogg, and Stefano Marcellini
Subjects: Quantum chromodynamics, Quark, Physics, Particle physics, Structure constants, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, High Energy Physics::Phenomenology, Observable, Jet (particle physics), Nuclear physics, Strong coupling, High Energy Physics::Experiment, Constant (mathematics), Engineering (miscellaneous), Event (particle physics), Particle Physics - Experiment
Abstract: The dependence of event shape cross sections on the QCD structure constantsCA,CF andTF is studied using data from the OPAL detector at LEP. The observables Thrust, Heavy Jet Mass, Total and Wide Jet Broadening are used. They allow the use ofO(αs2), resummed NLLA, and combinedO(αs2) plus resummed NLLA QCD calculations so that a comparison between the different approaches can be performed. The measured values of the structure constants are found to be consistent with standard QCD based on SU(3) and five active quark flavours. A measurement of the strong coupling constant using NLLA QCD calculations alone results in$\alpha _s (M_{Z^0 } ) = 0.113_{ - 0.008}^{ + 0.009}$, which complements our previous determinations.
Published: 1995
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39. A study of b quark fragmentation into B0 and B+ mesons at LEP

Author: Theodoros Geralis, E. Ros, S. M. Gascon-Shotkin, J. Palinkas, T. P. Kokott, A. Luig, D. Rigby, R. J. Hemingway, H. Mes, I. P. Duerdoth, Shlomo Dado, P. Fath, A. M. Rossi, F. Wäckerle, B. W. Kennedy, D. M. Gingrich, P. Jovanovic, T. Behnke, J. Steuerer, Austin Ball, Peter Krieger, P. Berlich, Manuella Vincter, Alessandro Montanari, P. W. Jeffreys, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, Giora Mikenberg, U. Jost, R. Mir, Reda Tafirout, Madjid Boutemeur, P. Igo-Kemenes, B. C. Shen, D. Axen, I. J. Bloodworth, J. C. Clayton, P. Bright-Thomas, Dave Charlton, P. Poffenberger, H. Jeremie, P. G. Estabrooks, A. Jawahery, Marco Cuffiani, M. Settles, Siegfried Bethke, A. K. Honma, B. Nijjhar, J. J. Ward, W. Matthews, W. G. Scott, R. E. Hughes-Jones, Yoram Rozen, F. G. Oakham, P. Vikas, D. Lanske, T. J. McMahon, P. Schütz, Ehud Duchovni, M. A. Thomson, Peter Sherwood, E. L. Barberio, M. Foucher, Alexander Wagner, Paolo Giacomelli, P. M. Watkins, S. L. Chu, R. Bürgin, B. Fabbro, M. Hansroul, E. K. U. Gross, C. Dallapiccola, M. Jimack, A. Gaidot, W. R. Gibson, J. Ludwig, S. Braibant, E. Lefebvre, N. J. Oldershaw, Richard Keeler, K. Runge, P. Bock, J. D. Gillies, T. Wlodek, Junichi Kanzaki, T. Hilse, M. Sproston, D. Karlen, J. Schwiening, R. K. Carnegie, E. do Couto e Silva, N. I. Geddes, S. W. Gensler, F. S. Merrtt, R. D. Heuer, Dezso Horvath, Fabrizio Fabbri, C. Burgard, F. Odorici, O. Runolfsson, M. J. Losty, A. Beck, S. J. Hillier, P. Gagnon, N. Altekamp, J. A. Wilson, A. I. McNab, John Allison, R. Howard, Jean-Arcady Meyer, C. H. Shepherd-Themistocleous, T. Kobayashi, N. L. Rodning, Gideon Bella, R. J. Barlow, D. J. Miller, C. Beeston, Sven Menke, J. Goldberg, B. Poli, A. Sittler, Claudio Grandi, D. R. Rust, J. P. Pansart, R. J. Homer, O. Schaile, R. W. Springer, R. G. Kellogg, Silvia Arcelli, B. Nellen, G. A. Snow, C. P. Ward, S. Söldner-Rembold, H. J. Burckhart, Jacqueline Batley, T. Tsukamoto, N. Tesch, N. K. Watson, H. M. Fischer, M. Starks, A. J. Martin, H. M. Bosch, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, G. A. Beck, C. Darling, T. J. Smith, Achim Stahl, A. M. Lee, Csaba Hajdu, Stefano Marcellini, E. A. Mckigney, A. Michelini, P. S. Wells, M. Tecchio, E. von Törne, S. W. O'Neale, O. C. Cooke, G. W. Wilson, K. J. Anderson, M. Hauschild, Georges Azuelos, P. Mättig, Stephen Lloyd, E. Tsur, J. Lauber, Terry Richard Wyatt, W. P. Lai, Frank Fiedler, D. Hochman, S. G. Clowes, M. Fierro, Shoji Asai, B. Schmitt, S. A. Robins, Robert M Brown, C. Markus, K. W. Bell, J. E.G. Edwards, C. Hartmann, D. E. Plane, K. Stephens, J. Bechtluft, J. A. McKenna, C. Y. Chang, Misao Sasaki, C. M. Hawkes, Margret Fincke-Keeler, Daniel Lellouch, A. Joly, R. Kowalewski, J. M. Roney, W. Mohr, G. M. Dallavalle, P. Taras, A. Posthaus, J. von Krogh, F. Strumia, Michael Kobel, Takehiko Mori, E. H. Vokurka, K. Ametewee, R. J. Hawkings, V. Gibson, H. G. Evans, Gideon Alexander, Paolo Capiluppi, B. Stockhausen, Paul Kyberd, V. Zacek, F. K. Loebinger, L. A. del Pozo, C. Sbarra, Alan Watson, R. Bartoldus, D. M. Strom, M. J. Goodrick, C. Stegmann, Julie Kirk, H. Fukui, Joleen Pater, I. Cohen, D. L. Rees, D. R. Ward, T. Kress, R. Rylko, H. O. Ogren, Christoph Geich-Gimbel, G. Yekutieli, F. Scharf, R. Giacomelli, German Martinez, Gregor Herten, B. Wilkens, A. D. Schaile, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, M. G. Rison, F. X. Gentit, J. E. Conboy, A. Fürtjes, Gunter Wolf, J. E. Pilcher, S. Wotton, Stefan Kluth, Shlomit Tarem, Tara Shears, U. C. Dunwoody, C. J. Oram, P. A. Hart, M. J. Pearce, U. Müller, Otmar Biebel, C. K. Hargrove, Matthias Schröder, D. L. Wagner, H. Lafoux, H. Deng, J. Letts, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, M. Rosvick, M. Hapke, D. E. Hutchcroft, M. J. Oreglia, J. R. Carter, G. N. Patrick, S. B. Anderson, P. Szymanski, Stan Bentvelsen, Andris Skuja, G. D. Long, Tetsuro Mashimo, W. Gorn, A. S. Turcot, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, Hans-Christian Schultz-Coulon, James Pinfold, Randall Sobie, Michael Schulz, G. D. Lafferty, D. G. Fong, C. Lewis, J. Gascon, T. W. Pritchard, A. Malik, J. W. Gary, Guenter Duckeck, D. S. Koetke, Marcello Mannelli, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, J. G. Layter, R. Lahmann, C. Charlesworth, D. C. Imrie, M. Palazzo, Stefania Xella, P. E.L. Clarke, M. K. Jones, G. P. Siroli, J. P. Martin, M. Tscheulin, John Hill, S. De Jong, J. King, H. Przysiezniak, Kiyotomo Kawagoe, P. Weber, R. Van Kooten, and Sachio Komamiya
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Bottom quark, Nuclear physics, Fragmentation (mass spectrometry), Mass spectrum, High Energy Physics::Experiment, B meson, Nuclear Experiment, Particle Physics - Experiment, Free parameter
Abstract: A study of b quark fragmentation at LEP is presented using a sample of semileptonic B decays containing a fully reconstructed charm meson. The data are compared to several theoretical models for heavy quark fragmentation; the free parameters in these models are fitted and the sensitivity of the model parameters to the rate of P-wave B meson production is studied. The mean scaled energy fraction of B 0 and B + mesons has been determined to be x E > = 0.695 ± 0.006 ± 0.003 ± 0.007, where the errors are statistical, systematic and model dependence respectively. This result is consistent with previous, less direct measurements from inclusive leptonic B decays. Also presented is a model independent fit to the shape of the energy distribution of weakly decaying B mesons at LEP.
Published: 1995
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40. A comparison of b and uds quark jets to gluon jets

Author: C. M. Hawkes, N. J. Oldershaw, P. Gagnon, Daniel Lellouch, C. Dallapiccola, M. Hapke, E. Lefebvre, Takehiko Mori, John Allison, J. D. Gillies, A. Sittler, A. I. McNab, O. Schaile, R. G. Kellogg, F. Odorici, Csaba Hajdu, Stefano Marcellini, D. E. Hutchcroft, J. Goldberg, V. Zacek, B. Nellen, W. Matthews, H. M. Bosch, N. Altekamp, B. C. Shen, M. Starks, J. Palinkas, B. Stockhausen, Paul Kyberd, F. K. Loebinger, J. Lauber, A. Joly, R. J. Barlow, Siegfried Bethke, M. A. Thomson, M. J. Oreglia, P. Poffenberger, Joleen Pater, A. K. Honma, B. Nijjhar, W. G. Scott, R. Giacomelli, D. J. Miller, Silvia Arcelli, H. G. Evans, M. J. Goodrick, F. Strumia, K. Stephens, R. Kowalewski, Shlomo Dado, Gregor Herten, I. Cohen, P. Schütz, T. Wlodek, J. R. Carter, M. Sproston, I. J. Bloodworth, R. Howard, B. Wilkens, A. Gaidot, U. Müller, J. Bechtluft, G. N. Patrick, Gunter Wolf, F. X. Gentit, P. Igo-Kemenes, M. Settles, H. Jeremie, M. F. Turner-Watson, M. Morii, Dezso Horvath, M. J. Losty, J. P. Pansart, S. G. Clowes, Yoram Rozen, J. E. Pilcher, H. Mes, I. P. Duerdoth, Peter R Hobson, T. Tsukamoto, M. Foucher, Otmar Biebel, N. Tesch, R. E. Hughes-Jones, M. Fierro, V. Gibson, N. I. Geddes, A. J. Martin, Jean-Arcady Meyer, T. Kobayashi, J. E.G. Edwards, D. L. Wagner, F. S. Merritt, D. Rigby, R. J. Hemingway, P. Fath, Junichi Kanzaki, S. Wotton, R. D. Heuer, P. Routenburg, D. Karlen, C. Burgard, Fabrizio Fabbri, T. Behnke, N. L. Rodning, C. Y. Chang, Sachio Komamiya, Theodoros Geralis, B. W. Kennedy, E. A. Mckigney, W. R. Gibson, P. W. Jeffreys, J. Steuerer, G. W. Wilson, D. Axen, A. Jawahery, M. Hauschild, H. Deng, P. Jovanovic, E. do Couto e Silva, E. Ros, A. T. Watson, P. Taras, Michael Kobel, Austin Ball, Eilam Gross, N. K. Watson, B. Poli, C. Darling, Peter Sherwood, W. P. Lai, J. G. Layter, Giora Mikenberg, Dave Charlton, G. A. Beck, C. Markus, Achim Stahl, T. J. Smith, C. K. Hargrove, Peter Krieger, R. Van Kooten, Matthias Schröder, J. Letts, Stefan Kluth, Shlomit Tarem, D. R. Ward, Alexander Wagner, H. Lafoux, T. Kress, R. W. Springer, R. Lahmann, P. Mättig, Shoji Asai, D. C. Imrie, M. Palazzo, J. Ludwig, Julie Kirk, T. P. Kokott, A. Luig, E. H. Vokurka, A. Beck, Sven Menke, J. M. Roney, Norbert Wermes, Sherry Towers, T. Kawamoto, Manuella Vincter, Alessandro Montanari, J. C. Clayton, U. Jost, P. Bright-Thomas, B. Schmitt, P. S. Wells, R. Mir, S. M. Gascon-Shotkin, R. Bürgin, B. Fabbro, C. J. Oram, S. Braibant, J. A. McKenna, Margret Fincke-Keeler, C. Charlesworth, Georges Azuelos, J. J. Ward, P. Vikas, Terry Richard Wyatt, Lorne Levinson, P. D. Phillips, Hans-Christian Schultz-Coulon, E. Tsur, G. P. Siroli, J. King, Marco Cuffiani, D. Lanske, Gilles Beaudoin, S. L. Chu, G. Giacomelli, S. Orito, M. Rosvick, F. Wäckerle, D. M. Gingrich, K. W. Bell, S. W. O'Neale, A. Skillman, K. J. Anderson, Randall Sobie, Gideon Bella, Madjid Boutemeur, Tara Shears, U. C. Dunwoody, P. A. Hart, Stefania Xella, J. C. Hill, R. Bartoldus, Michael Schulz, G. D. Lafferty, H. J. Burckhart, Jacqueline Batley, K. Runge, Misao Sasaki, M. J. Pearce, C. Hartmann, D. E. Plane, H. O. Ogren, Christoph Geich-Gimbel, Kiyotomo Kawagoe, W. Mohr, A. M. Rossi, G. A. Snow, C. P. Ward, P. G. Estabrooks, R. K. Keeler, P. Berlich, P. Bock, F. G. Oakham, G. M. Dallavalle, P. E.L. Clarke, T. Hilse, O. Runolfsson, M. K. Jones, E. L. Barberio, S. Söldner-Rembold, H. M. Fischer, A. Posthaus, D. R. Rust, J. P. Martin, P. Weber, A. Michelini, D. M. Strom, T. W. Pritchard, P. M. Watkins, M. Tscheulin, J. E. Conboy, C. Stegmann, A. Fürtjes, S. De Jong, Paolo Giacomelli, Reda Tafirout, M. Hansroul, S. A. Robins, Guenter Duckeck, H. Fukui, C. Beeston, A. M. Lee, Claudio Grandi, R. Rylko, M. Tecchio, E. von Törne, C. H. Shepherd-Themistocleous, H. Przysiezniak, R. J. Homer, S. B. Anderson, P. Szymanski, Frank Fiedler, D. Hochman, D. L. Rees, F. Scharf, German Martinez, G. G. Hanson, Stan Bentvelsen, A. D. Schaile, P. Schenk, M. S. Dixit, Frans Meijers, A. S. Turcot, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, M. Jimack, S. W. Gensler, S. J. Hillier, Stephen Lloyd, Robert M Brown, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, Andris Skuja, G. D. Long, Tetsuro Mashimo, W. Gorn, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, C. Sbarra, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, and J. A. Wilson
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Bottom quark, Charged particle, Gluon, Vertex (geometry), Nuclear physics, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, Particle Physics - Experiment
Abstract: Symmetric three-jet events are selected from hadronic Z0 decays such that the two lower energy jets are each produced at an angle of about 150° with respect to the highest energy jet. In some cases, a displaced secondary vertex is reconstructed in one of the two lower energy jets, which permits the other lower energy jet to be identified as a gluon jet through anti-tagging. In other cases, the highest energy jet is tagged as a b jet or as a light quark (uds) jet using secondary vertex or track impact parameter and momentum information. Comparing the two lower energy jets of the events with a tag in the highest energy jet to the anti-tagged gluon jets yields a direct comparison of b, uds and gluon jets, which are produced with the same energy of about 24 GeV and under the same conditions. We observe b jets and gluon jets to have similar properties as measured by the angular distribution of particle energy around the jet directions and by the fragmentation functions. In contrast, gluon jets are found to be significantly broader and to have a markedly softer fragmentation function than uds jets. For thek ⊥ jet finder withy cut=0.02, we find $$\begin{gathered} \frac{{\left\langle {n^{ch.} } \right\rangle gluon}}{{\left\langle {n^{ch.} } \right\rangle b quark}} = 1.089 \pm 0.024(stat.) \pm 0.024(syst.) \hfill \\ \frac{{\left\langle {n^{ch.} } \right\rangle gluon}}{{\left\langle {n^{ch.} } \right\rangle uds quark}} = 1.390 \pm 0.038(stat.) \pm 0.032(syst.) \hfill \\ \end{gathered} $$ as the ratios of the mean charged particle multiplicity in the gluon jets compared to the b and uds jets. Results are also reported using the cone jet finder.
Published: 1995
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41. Measurement of the total photon proton cross section and its decomposition at 200 GeV centre of mass energy

Author: C. Cormack, G. G. Winter, C. Vallée, J. Martens, P. Steffen, R. D. Appuhn, F. Kole, K. Rüter, U. Stößlein, C. Niebuhr, J. H. Köhne, D. Zarbock, H. P. Wellisch, R. Nahnhauer, D. Goldner, Max Weber, E. Malinovski, E. Barrelet, David Cussans, P. Goritchev, B. Laforge, Y. Soloviev, T. Carli, M. Kuhlen, G. Grindhammer, Paul Newman, V. L. Hudgson, E. A. De Wolf, Ch. Berger, Karlheinz Meier, K. Rosenbauer, C. Wittek, G. Lindström, C. Gruber, Dusan Bruncko, K. Rybicki, D. Neyret, L. Büngener, H. Krehbiel, A. Pieuchot, T. Mavroidis, B. Naroska, F. Ferrarotto, M. Jaffre, J. E. Olsson, H. Genzel, A. Lebedev, M. Korn, S. Egli, Christoph Grab, G. Thompson, W. Bartel, I. Herynek, K. Daum, G. Knies, T. Greenshaw, P. Bispham, J. Haack, Stephen Maxfield, I. O. Skillicorn, H. B. Dreis, U. Bassler, M. Charlet, G. Buschhorn, G. Bertrand-Coremans, R. Starosta, D. Ozerov, D. Düllmann, Rosario Martín, R. J. Ellison, M. Rietz, D. Haidt, K. C. Hoeger, Murrough Landon, A. E. Wright, H. Itterbeck, Wolfgang Lange, P. Van Mechelen, B. Waugh, G. Weber, H. Henschel, F. W. Büsser, F. Zomer, U. Straumann, H. J. Behrend, J.C. Bizot, M. Goldberg, J. Stiewe, P. Van Esch, E. Evrard, Eram Rizvi, L. Del Buono, L. Criegee, Grzegorz Nowak, W. Braunschweig, C. Jacobsson, A. Gellrich, V. Riech, F. Sefkow, J. P. Sutton, Claus Kleinwort, V. Andreev, G. Heinzelmann, D. Kant, Kerstin Borras, A. Semenov, M. Fleischer, P. Ribarics, T. Jansen, R. Felst, J. Formánek, A. B. Clegg, Andrew Mehta, S. Schiek, S. Tapprogge, H. Spitzer, Armen Vartapetian, M. Hapke, R. Sell, Benno List, J. Gayler, I. R. Kenyon, S. Kazarian, G. Villet, Barbara Clerbaux, R. Kaschowitz, Pierre Marage, E. Mroczko, M. Gebauer, B. Delcourt, D. Vandenplas, H. Küster, F. Brasse, V. Korbel, W.D. Dau, D. Lüke, A. Wegner, N. Gogitidze, H. Rick, J. B. Dainton, U. Siewert, F. Lamarche, A. Rostovtsev, A. Droutskoi, G. Rädel, C. Leverenz, J. Garvey, O. Hamon, S. Levonian, J. Zsembery, J. M. Link, E. Panaro, J. Kurzhöfer, H. Ehrlichmann, E. Wünsch, V. Solochenko, M. Zimmer, A. M. Fomenko, J. D. Dowell, Dave Sankey, M. Wagener, Roland Horisberger, A. Valkárová, U. Kathage, Vincent Boudry, M. Hampel, B. Kuznik, A. Meyer, Ph. Huet, V. Brisson, Yves Sirois, Jean-Francois Laporte, V. Nagovizin, G. D. Patel, P. Loch, S. Riess, Ch. Pichler, K. Gabathuler, A. Buniatian, Jean-Arcady Meyer, D. Wegener, W.J. Haynes, R. Gerhards, M. J. Burton, J. Lipinski, R. Bernet, K. Flamm, G. Franke, Yong Ban, N. Magnussen, K. Johannsen, P. Verrecchia, J. Žáček, A. Courau, Christophe Royon, J. Feltesse, S. Eichenberger, G. Martin, David Schmidt, J. Bähr, S. Spielman, T. Köhler, M. W. Krasny, V. Schröder, S. Schleif, K. H. Hiller, R. C. W. Henderson, N. Sahlmann, H. H. Kaufmann, Eckhard Elsen, Wolfram Erdmann, E. Schuhmann, Winston Ko, S. Aid, P. I. P. Kalmus, J. V. Morris, G. Schmidt, C. Pascaud, V. Efremenko, P. Hill, F. Linsel, P.-O. Meyer, G. W. Noyes, Martin Erdmann, U. Obrock, Zhen Zhang, Guenter Eckerlin, André Schöning, S. Mani, A. Walther, P. Biddulph, Hermann Kolanoski, D. Clarke, H. E. Roloff, M. Forbush, S. Mikocki, J. Bán, J. Tutas, F. Niebergall, J. D. Burger, H. P. Beck, Stephen Burke, A. Braemer, D. Mercer, M. A. Jabiol, W. Zimmermann, Gianfranco Sciacca, J. Riedlberger, H. Hufnagel, J. W. Lomas, I. Sheviakov, D. Newton, V. Lubimov, R. Prosi, J. Ebert, S. Masson, Leif J. Jönsson, John A Coughlan, A. Usik, K. Stolze, M. Höppner, C. A. Meyer, S. Prell, P. Dixon, H. Lohmander, P. Lanius, A. Gruber, R. Buchholz, L. N. Shtarkov, U. Krüger, A. Migliori, Horst Oberlack, Markus Seidel, A. Glazov, V. Tchernyshov, G. Siegmon, H. U. Martyn, Matthias Klein, David Milstead, P. A. Smirnov, Ch. Ley, A. Panitch, C.D. Hilton, J.G. Contreras, Daniel Johnson, R. Beyer, S. Dagoret, P. Palmen, L. Goerlich, F. Moreau, J. Hladký, F. Lehner, J. Theissen, J. Duboc, B. Stella, D. Feeken, A. Jacholkowska, B. Gonzalez-Pineiro, K. Stephens, E. Peppel, M. Arpagaus, S. D. Kolya, M. Oakden, R. Marshall, Dirk Krücker, R. Roosen, J. Ferencei, V I. Shekelyan, A. Wagener, S. Reinshagen, J. Martyniak, K. Wacker, R. Steinberg, J. Spiekermann, R. L. Lander, Daniel Pitzl, Frank Raupach, S. M. Robertson, N. Wulff, B. Fominykh, P. Kasselmann, F. Charles, J. Katzy, H. K. Nguyen, I. V. Gorelov, K. Müller, R.K. Griffiths, R. Grässler, Ch. Coutures, W. Struczinski, U. Krüner-Marquis, G. Müller, M. F. Hess, Emmanuelle Perez, G. Lobo, P. Kostka, J. M. Foster, S. Bourov, Carl R. Brune, M. Barth, J. Turnau, K. Zuber, Eckhart Fretwurst, M. Steenbock, S. K. Kotelnikov, L. Hajduk, B. Andrieu, H. Meyer, S. Kermiche, W. Hildesheim, J. Cvach, Ch. Niedzballa, P. Di Nezza, Peter Robmann, S. Willard, M. Winde, P. Uelkes, Didier Lacour, M. Hütte, L. Johnson, G. Pope, Steve McMahon, P. Baranov, O. Dünger, F. Botterweck, Peter Schleper, T. Krämerkämper, R. Maraček, W. von Schlippe, Marc Besancon, A.S. Belousov, Sergey Rusakov, T. Merz, P. Truöl, H. Pawletta, R. Nisius, J. R. Smith, E. Eisenhandler, Th. Naumann, H. Duhm, E. Gabathuler, M. David, C.L. Davis, M. Flieser, J. Stier, J. Marks, Y. Vazdik, L.R. West, M. Nyberg-Werther, T. R. Ebert, A. Fedotov, Günter Flügge, T. P. Yiou, M. zurNedden, C. Kiesling, A. De Roeck, A. J. Campbell, T. Kurča, J. Janoth, Volker Blobel, R. Eichler, G. Cozzika, F. Eisele, C. Keuker, J.P. Phillips, Klaus Rabbertz, Stefan Valkar, Hannes Jung, Alexander Zhokin, B. Schwab, Pavel Murin, H. Grässler, M. Ibbotson, R. Barschke, Laurent Favart, C. Dollfus, F. Rouse, Ulrich Goerlach, T. C. Nicholls, Peter Schacht, G. C. Lopez, Gregorio Bernardi, Anton Babaev, C. Thiebaux, J. Strachota, and P. E. Reimer
Subjects: Nuclear physics, Physics, Elastic scattering, Particle physics, Cross section (physics), Photon, Physics and Astronomy (miscellaneous), Proton, Detector, High Energy Physics::Experiment, Center of mass, HERA, Dissociation (chemistry)
Abstract: We present a new measurement of the total photoproduction cross section performed with the H1 detector at HERA. For an average centre of mass energy of 200 GeV a value of σtotλp=165±2±11µb has been obtained. A detailed analysis of the data in adequate kinematic regions enabled a decomposition of the total cross section in its elastic, single diffractive dissociation and remaining non-diffractive parts, based on safe assumptions on the double diffractive dissociation contribution.
Published: 1995
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42. A measurement of the forward-backward asymmetry of e+e−→bb by applying a jet charge algorithm to lifetime tagged events

Author: H. O. Ogren, F. S. Merritt, Christoph Geich-Gimbel, J. A. McKenna, Silvia Arcelli, F. X. Gentit, J. E. Conboy, A. Fürtjes, Andris Skuja, M. Fanti, Tara Shears, Margret Fincke-Keeler, N. J. Oldershaw, John Allison, Sachio Komamiya, M. Hapke, G. D. Long, U. C. Dunwoody, P. A. Hart, Theodoros Geralis, E. Ros, A. T. Watson, C. M. Hawkes, Daniel Lellouch, S. Braibant, D. E. Hutchcroft, P. E.L. Clarke, M. K. Jones, Takehiko Mori, P. S. Wells, Tetsuro Mashimo, T. Hilse, H. M. Fischer, T. J. Smith, Terry Richard Wyatt, E. A. Mckigney, W. P. Lai, P. Igo-Kemenes, W. Matthews, H. Mes, I. P. Duerdoth, R.J. Akers, O. Schaile, J. P. Martin, R. G. Kellogg, J. Steuerer, M. J. Pearce, Gideon Bella, O. Runolfsson, P. Fath, R. D. Heuer, K. Stephens, J. M. Roney, Fabrizio Fabbri, H. Jeremie, M. J. Oreglia, Eilam Gross, M. Tscheulin, S. De Jong, A. Michelini, T. Behnke, Stefano Marcellini, R. E. Hughes-Jones, G. A. Snow, C. P. Ward, V. Zacek, T. J. McMahon, M. Starks, J. Schwiening, M. A. Thomson, Stefan Kluth, Shlomit Tarem, C. Beeston, T. P. Kokott, A. Luig, D. Rigby, R. J. Hemingway, H. J. Burckhart, Claudio Grandi, Madjid Boutemeur, A. Buijs, D. R. Rust, A. J. Martin, S. Söldner-Rembold, W. Gorn, R. K. Carnegie, S. W. O'Neale, R. W. Springer, D. M. Strom, C. Stegmann, Jacqueline Batley, A. Gaidot, P. W. Jeffreys, G. A. Beck, Achim Stahl, A. S. Turcot, C. J. Oram, T. Wlodek, P. G. Estabrooks, M. Sproston, K. J. Anderson, R. K. Keeler, H. Fukui, B. Stockhausen, Paul Kyberd, F. K. Loebinger, W. R. Gibson, B. W. Kennedy, A. M. Lee, E. do Couto e Silva, D. Axen, I. J. Bloodworth, A. Jawahery, P. Jovanovic, E. von Törne, P. Bright-Thomas, P. M. Watkins, Austin Ball, Gunter Wolf, J. R. Carter, G. N. Patrick, J. A. Wilson, Peter Sherwood, H. Przysiezniak, S. A. Robins, Peter Krieger, Gregor Herten, V. Gibson, Otmar Biebel, C. Y. Chang, J. J. Ward, M. Settles, P. Scharff-Hansen, Alexander Wagner, T. Tsukamoto, P. Vikas, R. Giacomelli, Sven Menke, D. Lanske, D. L. Wagner, B. Schmitt, N. Tesch, B. Wilkens, Shlomo Dado, J. Ludwig, Yoram Rozen, S. Wotton, Manuella Vincter, K. Runge, P. Bock, Marco Cuffiani, E. Lefebvre, R. Van Kooten, Kiyotomo Kawagoe, Alessandro Montanari, P. Taras, Michael Kobel, J. Bechtluft, M. Foucher, U. Müller, H. Deng, M. F. Turner-Watson, N. K. Watson, F. Odorici, R. Mir, P. Gagnon, Xinchou Lou, M. Morii, J. E. Pilcher, R. Howard, A. Beck, A. I. McNab, J. Goldberg, Peter R Hobson, Georges Azuelos, P. Weber, F. Wäckerle, J. P. Pansart, A. M. Smith, C. Sbarra, Julie Kirk, Giora Mikenberg, P. Routenburg, B. Nellen, D. M. Gingrich, Junichi Kanzaki, D. Karlen, J. Lauber, S. G. Clowes, M. Fierro, J. E.G. Edwards, J. Letts, D. R. Ward, T. Kress, H. Lafoux, G. W. Wilson, S. L. Chu, M. Hauschild, C. Burgard, G. T. Zorn, G. Vasseur, B. Lorazo, Paolo Giacomelli, A. Joly, Norbert Wermes, Sherry Towers, T. Kawamoto, C. Markus, P. Berlich, W. Mohr, R. Lahmann, M. Hansroul, G. Yekutieli, H. M. Bosch, Wolfram Dietrich Zeuner, F. G. Oakham, P. Poffenberger, K. W. Bell, H. G. Evans, A. Posthaus, Dave Charlton, D. C. Imrie, M. J. Goodrick, I. Cohen, S. Orito, James Pinfold, M. Rosvick, E. L. Barberio, D. G. Fong, J. Gascon, A. A. Carter, Ron Folman, C. Darling, J. C. Hill, N. I. Geddes, Misao Sasaki, C. H. Shepherd-Themistocleous, R. Bürgin, G. G. Hanson, M. W. Redmond, G. P. Siroli, J. King, C. Dallapiccola, Roger Jones, P. Schütz, P. Texeira-Dias, B. Fabbro, Lorne Levinson, P. D. Phillips, J. D. Gillies, B. J. King, R. J. Homer, P. Mättig, B. C. Shen, N. L. Rodning, Frank Fiedler, G. Giacomelli, B. Poli, Shoji Asai, P. Utzat, N. Altekamp, D. Hochman, C. K. Hargrove, Siegfried Bethke, A. K. Honma, B. Nijjhar, M. G. Rison, W. G. Scott, R. J. Barlow, D. L. Rees, D. J. Miller, J. C. Clayton, Matthias Schröder, P. Schenk, Gilles Beaudoin, A. Skillman, F. Scharf, M. S. Dixit, M. J. Losty, Frans Meijers, A. M. Rossi, J. G. Layter, Hans-Christian Schultz-Coulon, A. D. Schaile, C. Hartmann, D. E. Plane, C. Charlesworth, G. M. Dallavalle, Randall Sobie, Michael Schulz, G. D. Lafferty, Reda Tafirout, T. W. Pritchard, Guenter Duckeck, S. B. Anderson, P. Szymanski, Stan Bentvelsen, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Stephen Lloyd, M. Tecchio, Robert M Brown, A. Malik, J. W. Gary, D. S. Koetke, Ehud Duchovni, Marcello Mannelli, J. E. Duboscq, M. Jimack, F. Palmonari, S. W. Gensler, S. J. Hillier, T. Kobayashi, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, and R. Bartoldus
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Charge (physics), Jet (particle physics), Asymmetry, Standard Model, Nuclear physics, Higgs boson, Engineering (miscellaneous), Algorithm, Energy (signal processing), media_common, Bar (unit)
Abstract: The forward-backward asymmetry of$e^ + e^ - \to Z^0 \to b\bar b$ has been measured using approximately 2.15 million hadronicZ0 decays collected at the LEP e+e− collider with the OPAL detector. A lifetime tag technique was used to select an enriched$b\bar b$ event sample. The measurement of the$b\bar b$ asymmetry was then performed using a jet charge algorithm to determine the direction of the primary quark. Values of: $$\begin{gathered} A_{FB}^b = 0.062 \pm 0.034 \pm 0.002 - 0.082\Delta (\Gamma _{b\bar b} /\Gamma _{had} ) \hfill \\ at\sqrt s = 89.52GeV, \hfill \\ A_{FB}^b = 0.0963 \pm 0.0067 \pm 0.0038 - 0.471\Delta (\Gamma _{b\bar b} /\Gamma _{had} ) \hfill \\ at\sqrt s = 91.25GeV, \hfill \\ A_{FB}^b = 0.172 \pm 0.028 \pm 0.007 - 0.055\Delta (\Gamma _{b\bar b} /\Gamma _{had} ) \hfill \\ at\sqrt s = 92.94GeV, \hfill \\ \end{gathered}$$ were measured where, in each case, the first error is statistical, the second is systematic and the third term gives the variation due to a change$\Delta (\Gamma _{b\bar b} /\Gamma _{had} )$ in the value of$\Gamma _{b\bar b} /\Gamma _{had} = 0.216$ assumed. The dependence on the assumed charm asymmetry at the same energy is Δ(AFBb)≈+0.07Δ(AFBc). Assuming the Standard Model form for the couplings, these measurements correspond to an effective weak mixing angle of: $$\sin ^2 \theta _W^{eff,e} = 0.2313 \pm 0.0012 \pm 0.0006$$ giving Mtop=196−38−19+33+16GeV/c2, where the first error is statistical and the second is systematic. The Higgs mass assumed is 300 GeV/c2. A variation in the assumed mass of the Higgs boson between 60 and 1000 GeV/c2 corresponds to an uncertainty in sin2θWeff,e of ±0.00006 and on Mtop of−26+20GeV/c2.
Published: 1995
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43. Δ++ production in hadronic Z0 decays

Author: W. R. Gibson, H. J. Burckhart, Jacqueline Batley, S. Braibant, A. Beck, U. Jost, R. Mir, Andris Skuja, G. D. Long, A. I. McNab, J. Goldberg, D. Rigby, R. J. Hemingway, R. M. Brown, Lorne Levinson, P. D. Phillips, B. W. Kennedy, G. W. Wilson, P. Jovanovic, M. Hauschild, Austin Ball, C. Markus, Peter Krieger, Paolo Giacomelli, M. Hansroul, Manuella Vincter, Alessandro Montanari, Gilles Beaudoin, F. G. Oakham, Tetsuro Mashimo, B. Nellen, D. Axen, A. Jawahery, E. H. Vokurka, A. Skillman, E. L. Barberio, N. I. Geddes, B. Stockhausen, Paul Kyberd, F. K. Loebinger, C. H. Shepherd-Themistocleous, R. Lahmann, D. C. Imrie, M. Palazzo, Peter Sherwood, C. Dallapiccola, F. S. Merritt, C. Hartmann, D. E. Plane, J. D. Gillies, N. L. Rodning, R. J. Homer, N. Altekamp, W. Gorn, N. J. Oldershaw, U. Müller, G. P. Siroli, J. King, R. J. Barlow, H. G. Evans, M. J. Goodrick, Silvia Arcelli, D. J. Miller, Joleen Pater, G. M. Dallavalle, Stephen Lloyd, B. Poli, J. Ludwig, G. A. Snow, C. P. Ward, K. Runge, P. Bock, W. Matthews, P. Igo-Kemenes, H. Mes, I. Cohen, I. P. Duerdoth, R. Giacomelli, C. Darling, O. Schaile, H. Jeremie, J. Lauber, M. A. Thomson, J. Bechtluft, Dave Charlton, P. Fath, Margret Fincke-Keeler, J. A. McKenna, R. Kowalewski, S. B. Anderson, P. Szymanski, R. E. Hughes-Jones, Frank Fiedler, D. Hochman, S. Söldner-Rembold, R. Van Kooten, P. S. Wells, P. Scharff-Hansen, S. M. Gascon-Shotkin, Kiyotomo Kawagoe, T. J. McMahon, G. G. Hanson, E. K. U. Gross, F. Strumia, T. J. Smith, K. Stephens, A. Gaidot, P. Mättig, K. Ametewee, Shoji Asai, T. Wlodek, J. Schwiening, M. Sproston, Terry Richard Wyatt, Gideon Alexander, Stefan Kluth, R. Bürgin, B. Fabbro, Paolo Capiluppi, M. Starks, A. J. Martin, Reda Tafirout, R. Bartoldus, R. K. Carnegie, E. A. Mckigney, Shlomit Tarem, C. M. Hawkes, C. K. Hargrove, Daniel Lellouch, P. Weber, A. M. Smith, T. Tsukamoto, N. Tesch, Takehiko Mori, H. O. Ogren, V. Gibson, Christoph Geich-Gimbel, Matthias Schröder, G. Giacomelli, Stan Bentvelsen, E. do Couto e Silva, A. Joly, C. J. Oram, J. A. Wilson, G. Vasseur, P. Schenk, B. Lorazo, Ehud Duchovni, S. L. Chu, V. Zacek, N. K. Watson, F. Wäckerle, A. M. Rossi, M. Jimack, P. Gagnon, D. R. Ward, T. Kress, D. M. Gingrich, Sven Menke, W. P. Lai, H. Lafoux, J. C. Clayton, H. M. Fischer, John Allison, J. Palinkas, S. W. Gensler, A. S. Turcot, F. X. Gentit, S. J. Hillier, T. Kobayashi, P. Berlich, M. S. Dixit, Gregor Herten, Frans Meijers, A. Sittler, J. E. Conboy, A. Fürtjes, James Pinfold, Gunter Wolf, D. G. Fong, C. Lewis, J. Gascon, Shlomo Dado, E. Lefebvre, A. Michelini, R. Howard, P. E.L. Clarke, W. Mohr, B. Wilkens, D. R. Rust, J. P. Pansart, A. Wagne, G. A. Beck, Achim Stahl, R. G. Kellogg, H. M. Bosch, A. Posthaus, I. J. Bloodworth, O. C. Cooke, Csaba Hajdu, S. A. Robins, M. K. Jones, J. P. Martin, F. Odorici, Stefano Marcellini, A. M. Lee, M. Tscheulin, J. E. Pilcher, J. M. Roney, M. Tecchio, E. von Törne, A. Malik, S. De Jong, J. W. Gary, D. S. Koetke, B. Schmitt, D. M. Strom, Hans-Christian Schultz-Coulon, C. Stegmann, Tara Shears, J. von Krogh, Giora Mikenberg, H. Fukui, M. Settles, Randall Sobie, Michael Schulz, G. D. Lafferty, R. Rylko, Yoram Rozen, U. C. Dunwoody, P. A. Hart, D. L. Rees, Marcello Mannelli, T. W. Pritchard, S. Wotton, M. J. Pearce, Guenter Duckeck, F. Scharf, German Martinez, R. J. Hawkings, R. D. Heuer, Fabrizio Fabbri, M. Foucher, A. D. Schaile, H. Przysiezniak, T. Behnke, J. Steuerer, L. A. del Pozo, C. Sbarra, Madjid Boutemeur, Junichi Kanzaki, D. Karlen, C. Burgard, G. Yekutieli, J. G. Layter, Marco Cuffiani, A. A. Carter, Ron Folman, C. Charlesworth, Roger Jones, P. G. Estabrooks, R. K. Keeler, B. J. King, P. Utzat, Stefania Xella, M. G. Rison, P. M. Watkins, Otmar Biebel, D. L. Wagner, H. Deng, J. Letts, Norbert Wermes, Sherry Towers, T. Kawamoto, R. W. Springer, Georges Azuelos, E. Tsur, S. Orito, M. Rosvick, K. W. Bell, J. C. Hill, Misao Sasaki, M. Hapke, B. C. Shen, Siegfried Bethke, A. K. Honma, B. Nijjhar, D. E. Hutchcroft, W. G. Scott, M. J. Oreglia, J. R. Carter, Dezso Horvath, G. N. Patrick, M. J. Losty, Jean-Arcady Meyer, P. Poffenberger, P. Schütz, S. G. Clowes, M. Fierro, J. E.G. Edwards, C. Y. Chang, P. W. Jeffreys, P. Taras, Michael Kobel, P. Bright-Thomas, J. J. Ward, P. Vikas, D. Lanske, Julie Kirk, T. Hilse, O. Runolfsson, C. Beeston, Claudio Grandi, S. W. O'Neale, K. J. Anderson, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, T. P. Kokott, A. Luig, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, and Gideon Bella
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Monte Carlo method, Hadron, Astrophysics::Cosmology and Extragalactic Astrophysics, Strangeness, Nuclear physics, Baryon, Fragmentation function, High Energy Physics::Experiment, Nuclear Experiment, Production rate
Abstract: The production of Δ++ baryons has been measured using 3.5 million hadronic Z0 decays collected with the OPAL detector at LEP. The production rate and fragmentation function are presented. A total of 0.22 ± 0.04 ± 0.04 Δ ++ + ( Δ ) −− per hadronic Z0 decay is observed. The fragmentation function is found to be softer than that predicted by the JETSET and HERWIG Monte Carlo event generators. With this measurement of Δ++ production, at least one baryon of each strangeness level in the lightest baryon decuplet has now been measured at LEP.
Published: 1995
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44. Measurement of the multiplicity of charm quark pairs from gluons in hadronic Z0 Decays

Author: Sachio Komamiya, T. Hilse, John Allison, O. Runolfsson, Theodoros Geralis, E. Ros, D. R. Rust, Madjid Boutemeur, C. Beeston, Claudio Grandi, R. W. Springer, T. P. Kokott, A. Luig, A. M. Lee, P. G. Estabrooks, R. G. Kellogg, Gregor Herten, P. W. Jeffreys, E. von Törne, C. M. Hawkes, Stefano Marcellini, Daniel Lellouch, S. Braibant, Takehiko Mori, Tara Shears, P. Bright-Thomas, B. Wilkens, P. M. Watkins, Georges Azuelos, J. Steuerer, J. J. Ward, P. Vikas, C. Sbarra, D. Lanske, S. G. Clowes, M. Fierro, Reda Tafirout, U. C. Dunwoody, V. Zacek, P. A. Hart, Gideon Bella, R. Bartoldus, K. W. Bell, A. Joly, H. J. Burckhart, Jacqueline Batley, Eilam Gross, M. Fanti, J. E. Pilcher, M. J. Pearce, H. O. Ogren, M. W. Redmond, Misao Sasaki, Silvia Arcelli, Christoph Geich-Gimbel, G. Yekutieli, R. Mir, G. A. Snow, C. P. Ward, A. I. McNab, M. Hapke, T. Behnke, I. J. Bloodworth, W. R. Gibson, J. Goldberg, G. W. Wilson, M. Hauschild, G. A. Beck, P. Igo-Kemenes, D. E. Hutchcroft, B. Stockhausen, Paul Kyberd, A. A. Carter, J. Lauber, S. Söldner-Rembold, Richard Keeler, F. K. Loebinger, Achim Stahl, Ron Folman, Roger Jones, P. Teixeira-Dias, B. C. Shen, H. Jeremie, U. Müller, Marco Cuffiani, F. X. Gentit, B. J. King, P. Utzat, M. Settles, Yoram Rozen, M. J. Oreglia, C. Markus, R. E. Hughes-Jones, B. Nellen, P. Gagnon, A. Beck, M. G. Rison, S. L. Chu, M. Foucher, M. F. Turner-Watson, M. Morii, Peter R Hobson, J. G. Layter, B. Schmitt, E. A. Mckigney, F. G. Oakham, W. P. Lai, R. Howard, R. Giacomelli, J. E.C. Edwards, R. D. Heuer, O. C. Cooke, Lorne Levinson, P. D. Phillips, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, J. E. Conboy, A. Fürtjes, J. P. Pansart, E. L. Barberio, N. J. Oldershaw, P. Routenburg, G. T. Zorn, Junichi Kanzaki, E. do Couto e Silva, D. Karlen, C. Burgard, R.J. Akers, C. Charlesworth, M. J. Losty, H. M. Bosch, Wolfram Dietrich Zeuner, Gilles Beaudoin, A. Skillman, C. K. Hargrove, Matthias Schröder, Fabrizio Fabbri, C. Dallapiccola, Shlomo Dado, S. B. Anderson, P. Szymanski, J. von Krogh, H. G. Evans, M. J. Goodrick, J. R. Carter, S. W. O'Neale, G. N. Patrick, I. Cohen, K. J. Anderson, F. S. Merritt, R. Van Kooten, Paolo Giacomelli, M. Hansroul, Dave Charlton, J. M. Roney, O. Schaile, J. D. Gillies, R. J. Hawkings, D. Axen, A. Jawahery, C. Hartmann, Sven Menke, D. E. Plane, Otmar Biebel, Gunter Wolf, A. Buijs, C. Darling, Peter Sherwood, T. J. Smith, M. Starks, A. J. Martin, L. A. del Pozo, D. M. Strom, C. Stegmann, Stan Bentvelsen, C. H. Shepherd-Themistocleous, Alexander Wagner, T. J. McMahon, N. Altekamp, D. L. Wagner, G. M. Dallavalle, J. Bechtluft, J. A. McKenna, J. Ludwig, K. Runge, P. Bock, Giora Mikenberg, R. Bürgin, B. Fabbro, P. Mättig, J. Schwiening, R. J. Homer, R. K. Carnegie, G. G. Hanson, P. Poffenberger, Shoji Asai, H. Fukui, Margret Fincke-Keeler, R. J. Barlow, J. A. Wilson, R. Lahmann, Hans-Christian Schultz-Coulon, F. Wäckerle, D. J. Miller, Randall Sobie, Michael Schulz, G. D. Lafferty, D. C. Imrie, Alan Watson, S. Wotton, D. M. Gingrich, G. Giacomelli, H. Deng, T. W. Pritchard, P. Schütz, Guenter Duckeck, G. P. Siroli, J. King, P. Schenk, P. Berlich, A. S. Turcot, D. Rigby, R. J. Hemingway, M. S. Dixit, Frans Meijers, C. Y. Chang, J. Letts, P. S. Wells, B. W. Kennedy, P. Taras, Norbert Wermes, Michael Kobel, P. Jovanovic, P. E.L. Clarke, M. K. Jones, Terry Richard Wyatt, Sherry Towers, T. Kawamoto, Stefan Kluth, Shlomit Tarem, J. P. Martin, Austin Ball, M. Tscheulin, John Hill, S. De Jong, Julie Kirk, H. Lafoux, S. Orito, M. Rosvick, S. M. Gascon-Shotkin, Peter Krieger, Kiyotomo Kawagoe, H. Przysiezniak, Alessandro Montanari, A. M. Rossi, C. J. Oram, N. I. Geddes, N. L. Rodning, P. Weber, B. Poli, H. M. Fischer, A. Michelini, K. Stephens, S. A. Robins, V. Gibson, D. R. Ward, T. Kress, J. C. Clayton, Frank Fiedler, D. Hochman, R. Kowalewski, James Pinfold, D. G. Fong, J. Gascon, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, Andris Skuja, G. D. Long, Tetsuro Mashimo, W. Gorn, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, K. Ametewee, P. Vincter, Gideon Alexander, Paolo Capiluppi, Stephen Lloyd, M. Tecchio, Robert M Brown, Ehud Duchovni, M. Jimack, F. Palmonari, S. W. Gensler, S. J. Hillier, T. Kobayashi, H. Mes, I. P. Duerdoth, P. Fath, E. Lefebvre, N. K. Watson, F. Odorici, W. Mohr, A. Posthaus, D. L. Rees, F. Scharf, A. D. Schaile, W. Matthews, M. A. Thomson, A. Gaidot, T. Wlodek, M. Sproston, T. Tsukamoto, and N. Tesch
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Jet (particle physics), Charm quark, Gluon, Nuclear physics, Pair production, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Lepton
Abstract: We have measured the multiplicity of charm quark pairs arising from gluon splitting in a sample of about 3.5 million hadronic Z0 decays. By selecting a 3-jet event topology and tagging charmed hadrons in the lowest energy jet using leptons, we established a signature of heavy quark pair production from gluons. The average number of gluons splitting into a c c pair per hadronic event was measured to be n g→c c =(2.27±0.28±0.41) × 10 −2 .
Published: 1995
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45. A measurement of the Λ0 lifetime

Author: P. Scharff-Hansen, P. Igo-Kemenes, Richard Keeler, S. L. Chu, H. Jeremie, R. E. Hughes-Jones, A. M. Smith, Sachio Komamiya, Theodoros Geralis, E. Ros, G. Vasseur, B. Lorazo, H. Mes, I. P. Duerdoth, P. Fath, J. P. Martin, D. Rigby, R. J. Hemingway, Christopher Hawkes, E. Lefebvre, James Pilcher, T. Hilse, E. do Couto e Silva, Kiyotomo Kawagoe, R. Howard, F. Odorici, B. W. Kennedy, P. Jovanovic, John Wilson, Austin Ball, T. P. Kokott, Carla Sbarra, A. Luig, D. R. Rust, J. P. Pansart, J. Ludwig, M. Hapke, Peter Krieger, Hans-Christian Schultz-Coulon, O. Runolfsson, Manuella Vincter, Alessandro Montanari, J. R. Batley, Randall Sobie, Michael Schulz, G. D. Lafferty, G. W. Wilson, D. E. Hutchcroft, A. Joly, James Pinfold, G. Yekutieli, P. Weber, D. G. Fong, R. W. Springer, A. M. Lee, Sven Menke, M. Hauschild, Tara Shears, J. Gascon, Takashi Kobayashi, C. Beeston, A. Jawahery, J. Bechtluft, Ron Folman, J. A. McKenna, T. W. Pritchard, Roger Jones, E. von Törne, R. Mir, M. W. Redmond, C. Markus, P. E.L. Clarke, W. G. Scott, U. C. Dunwoody, Claudio Grandi, B. J. King, M. K. Jones, Guenter Duckeck, P. Utzat, P. A. Hart, A. Malik, J. W. Gary, J. Lauber, Shlomo Dado, C. Darling, Peter Sherwood, Terry Richard Wyatt, M. G. Rison, Stefan Kluth, Shlomit Tarem, S. W. O'Neale, J. Steuerer, Eilam Gross, D. S. Koetke, M. F. Turner-Watson, R. Lahmann, Ch. Geich-Gimbel, M. Fanti, D. Axen, M. J. Pearce, M. Tscheulin, John Hill, M. Morii, D. C. Imrie, Georges Azuelos, Marcello Mannelli, J. E. Duboscq, P. W. Jeffreys, Alexander Wagner, R. Bartoldus, J. R. Carter, E. L. Barberio, G. N. Patrick, Andris Skuja, T. J. McMahon, S. De Jong, A. S. Turcot, C. Dallapiccola, Helfried Burckhart, J. Schwiening, Peter R Hobson, R. K. Carnegie, B. Stockhausen, Paul Kyberd, Otmar Biebel, P. Mättig, Shoji Asai, D. L. Wagner, K. W. Bell, K. Runge, P. Bock, Giora Mikenberg, G. P. Siroli, A. I. McNab, J. D. Gillies, A. Buijs, P. Routenburg, Daniel Lellouch, F. G. Oakham, Gregor Herten, J. Goldberg, Misao Sasaki, J. King, G. D. Long, P. Poffenberger, D. M. Strom, C. Stegmann, B. Nellen, Tetsuro Mashimo, M. J. Losty, H. Deng, Takehiko Mori, N. Altekamp, Tatsuo Kawamoto, H. Fukui, B. C. Shen, S. Braibant, R. J. Barlow, D. J. Miller, B. Wilkens, Harold Ogren, Matthias Schröder, P. Bright-Thomas, R. D. Heuer, Siegfried Bethke, H. Przysiezniak, Marco Cuffiani, Douglas Gingrich, V. Zacek, Fabrizio Fabbri, P. Gagnon, A. K. Honma, B. Nijjhar, J. Letts, F. X. Gentit, J. E. Conboy, R. Van Kooten, A. Fürtjes, J. J. Ward, O. C. Cooke, P. Vikas, M. J. Goodrick, I. Cohen, P. Schütz, Sherry Towers, I. J. Bloodworth, W. Gorn, P. S. Wells, D. Lanske, G. A. Snow, S. B. Anderson, Norbert Wermes, S. Söldner-Rembold, P. Szymanski, N. J. Oldershaw, W. Mohr, R. Giacomelli, Gunter Wolf, S. Orito, M. Settles, Yoram Rozen, C. Y. Chang, M. Foucher, J. G. Layter, Dave Charlton, M. Rosvick, A. A. Carter, R.J. Akers, F. Wäckerle, G. T. Zorn, J. von Krogh, Junichi Kanzaki, P. Taras, Stan Bentvelsen, D. Karlen, R. Bürgin, B. Fabbro, C. Burgard, P. Berlich, R. J. Hawkings, O. Schaile, C. Charlesworth, Michael Kobel, U. Müller, Kelby Anderson, G. Giacomelli, H. M. Bosch, Wolfram Dietrich Zeuner, L. A. del Pozo, Gideon Bella, Julie Kirk, H. Lafoux, S. Wotton, M. Starks, Frank Merritt, A. J. Martin, S. G. Clowes, M. Fierro, J. E.G. Edwards, C. K. Hargrove, G. G. Hanson, John Allison, Xinchou Lou, P. Schenk, M. S. Dixit, Frans Meijers, T. Behnke, R. G. Kellogg, Stefano Marcellini, Peter Watkins, Fred Loebinger, Stephen Lloyd, M. Tecchio, Robert M Brown, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, J. C. Clayton, M. Jimack, T. J. Smith, K. Stephens, W. Matthews, Mark Oreglia, M. A. Thomson, F. Palmonari, V. Gibson, S. W. Gensler, A. Gaidot, T. Wlodek, M. Sproston, D. R. Ward, T. Kress, Christopher P. Ward, Frank Fiedler, D. Hochman, Hal Evans, T. Tsukamoto, N. Tesch, N. K. Watson, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, A. Posthaus, Margret Fincke-Keeler, D. L. Rees, Paolo Giacomelli, M. Hansroul, F. Scharf, C. H. Shepherd-Themistocleous, R. J. Homer, A. D. Schaile, Madjid Boutemeur, P. G. Estabrooks, H. M. Fischer, A. Michelini, S. A. Robins, Silvia Arcelli, C. J. Oram, N. I. Geddes, E. A. Mckigney, W. P. Lai, N. L. Rodning, B. Poli, J. M. Roney, A. M. Rossi, W. R. Gibson, A. Beck, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Alan Watson, and Reda Tafirout
Subjects: Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Electron–positron annihilation, Hadron, Atomic physics
Abstract: The lifetime of the Λ b 0 baryon has been measured using 3.6 million hadronic Z 0 decays recorded by the OPAL detector at LEP from 1990 to 1994. A sample of Λ b 0 decays is obtained using partially reconstructed semileptonic decays involving Λ c + l − combinations, where the Λ c + is reconstructed from its decay to a pK − π + final state. From the 69 ± 13 Λ c + l − combinations attributed to Λ b 0 decays in this data sample, we measure τ ( Λ b 0 ) = 1.14 −0.19 +0.22 ± 0.07 ps, where the errors are statistical and systematic, respectively.
Published: 1995
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46. A search for heavy leptons at HERA

Author: Peter Robmann, S. Aid, P. E. Reimer, J. Duboc, B. Stella, G. Müller, E. M. Hanlon, Carl R. Brune, M. Barth, L. R. West, V. Korbel, K. Rüter, C. Niebuhr, R. D. Appuhn, H. Krehbiel, A. Gellrich, F. Lamarche, G. G. Winter, B. Gonzalez-Pineiro, Hermann Kolanoski, P. Steffen, D. Clarke, John A Coughlan, Horst Oberlack, K. Rosenbauer, M. Vecko, P. R. Newman, J. Riedlberger, D. Mercer, G. Buschhorn, S. M. Robertson, R. L. Lander, S. Levonian, S. Masson, M. Colombo, D. Goldner, Y. Soloviev, Mikhail Danilov, F. Charles, M. F. Hess, G. Villet, Pierre Marage, H. U. Martyn, Matthias Klein, G. Lindström, K. Stephens, E. Peppel, R. Roosen, C. Gruber, H. P. Wellisch, Max Weber, J. Turnau, T. Jansen, M. Steenbock, Murrough Landon, A. E. Wright, J. Martyniak, G. Thompson, E. Malinovski, M. Kuhlen, A. Courau, B. Andrieu, T. Carli, K. Flamm, Christophe Royon, R. Nisius, Benno List, A. Buniatian, K. C. Hoeger, C. A. Meyer, G. Grindhammer, G. Rädel, D. Lüke, E. Wünsch, B. Fominykh, P. I. P. Kalmus, M. Hampel, B. Kuznik, R. Kaschowitz, W. Hildesheim, Roland Horisberger, A. Valkárová, V. Riech, I. Sheviakov, D. Wegener, W.J. Haynes, Ph. Huet, S. Riess, A. Gruber, I. W. Walker, A. Braemer, K. Rybicki, H. Itterbeck, P. Van Mechelen, M. Hapke, D. Düllmann, H. Henschel, D. Kant, Ch. Pichler, P. Hill, J. Bán, H. J. Behrend, J.C. Bizot, Emmanuelle Perez, Christoph Grab, Kerstin Borras, A. Semenov, M. Goldberg, Peter Schacht, G. C. Lopez, O. Dünger, M. Korn, Winston Ko, Dave Sankey, G. Siegmon, Jean-Arcady Meyer, R. Nahnhauer, E. Barrelet, U. Krüger, F. Botterweck, K. Daum, C. Pascaud, P. Loch, R. Gerhards, G. Weber, U. Straumann, David Cussans, F. Moreau, J. Hladký, J. Martens, Daniel Johnson, Vincent Hedberg, Frank Raupach, G. Knies, Armen Vartapetian, J. D. Dowell, R. J. Ellison, R. Marshall, Guenter Eckerlin, G. Cozzika, Dirk Krücker, L. N. Shtarkov, G. D. Patel, André Schöning, F. Kole, S. Schiek, F. Eisele, A. Jacholkowska, P. Verrecchia, J. R. Smith, S. Dagoret, T. Köhler, M. W. Krasny, F. Linsel, A. Wegener, L. Goerlich, A. Panitch, Martin Erdmann, S. D. Kolya, E. A. De Wolf, Ch. Berger, V. Schröder, R. Herma, Karlheinz Meier, J. Heatherington, J. Haack, Stefan Valkar, U. Obrock, Wolfgang Lange, E. Eisenhandler, Gregorio Bernardi, F. Niebergall, K. H. Hiller, Eckhart Fretwurst, I. O. Skillicorn, H. H. Kaufmann, H. B. Dreis, Eckhard Elsen, F. Brasse, R. C. W. Henderson, D. Newton, J. Gayler, R. Maraček, Anton Babaev, V. Efremenko, J. Ferencei, Steve McMahon, C. Thiebaux, S. Eichenberger, V I. Shekelyan, A. Walther, N. Wulff, J. Tutas, J. D. Burger, R. Prosi, L. Büngener, Hannes Jung, W. von Schlippe, T. Merz, U. Krüner-Marquis, P. Lanius, C. Vallée, E. Sanchez, W. Zimmermann, I. Tichomirov, K. Wacker, R. Steinberg, I. Herynek, J. Baehr, N. Magnussen, S. Mikocki, David Schmidt, J. Strachota, Markus Seidel, V. Tchernyshov, S. Tapprogge, W.D. Dau, N. Sahlmann, E. Evrard, P. Kasselmann, E. Schuhmann, B. Schwab, K. Gabathuler, A. Lebedev, Grzegorz Nowak, S. Egli, J. B. Dainton, C. Jacobsson, P. Biddulph, M. Fleischer, K. Johanssen, M. A. Jabiol, Pavel Murin, H. Grässler, M. Rietz, D. Haidt, H. Hufnagel, J. Feltesse, U. Bassler, M. Ibbotson, G. Bertrand-Coremans, R. Starosta, Daniel Pitzl, J. Kurzhöfer, V. Nagovizin, U. Seehausen, R. Eichler, F. Sefkow, P. Ribarics, G. Heinzelmann, C.D. Hilton, L. Criegee, B. Delcourt, M. Höppner, R. Felst, J.G. Contreras, J. P. Kubenka, U. Kathage, U. Stösslein, H. Meyer, S. Kermiche, Laurent Favart, S. Prell, S. K. Kotelnikov, L. Hajduk, J. Formánek, M. Gebauer, C. Dollfus, J. Garvey, R. Buchholz, C. Leverenz, David Milstead, V. Brisson, G. W. Noyes, A. M. Fomenko, P. A. Smirnov, O. Hamon, H. Küster, H. Shooshtari, F. Rouse, P. Baranov, J. V. Morris, G. Schmidt, Didier Lacour, G. Pope, Peter Schleper, Ulrich Goerlach, Dusan Bruncko, M. Jaffre, J. E. Olsson, Marc Besancon, M. Forbush, A. Schwind, B. Naroska, F. Ferrarotto, A.S. Belousov, Sergey Rusakov, P. Truöl, H. Genzel, W. Bartel, T. Greenshaw, C. Schmidt, J.P. Phillips, J. P. Sutton, P. Di Nezza, Rosario Martín, P. Van Esch, Stephen Maxfield, A. Lindner, J. Janoth, A. Rostovtsev, Claus Kleinwort, J. Stiewe, F. W. Büsser, Volker Blobel, P. Goritchev, C. Keuker, W. Braunschweig, K. Gamerdinger, A. B. Clegg, R. Rylko, Andrew Mehta, N. Gogitidze, R. Sell, D. Neyret, T. Mavroidis, S. Kazarian, U. Siewert, F. Zomer, A. M. Goodall, L. Del Buono, V. Andreev, M. Zimmer, Vincent Boudry, Jean-Francois Laporte, H. Ehrlichmann, Yves Sirois, J. Lipinski, G. Franke, Zhen Zhang, J. Žáček, J. Ebert, J. M. Foster, S. Mani, H. P. Beck, Stephen Burke, A. Usik, M. Savitsky, K. Zuber, J. Cvach, H. Bergstein, Th. Naumann, H. Duhm, E. Gabathuler, E. Deffur, P. Kostka, Ch. Ley, M. David, S. Reinshagen, A. Wagener, H. K. Nguyen, I. V. Gorelov, K. Müller, R. Grässler, Ch. Coutures, W. Struczinski, M. Flieser, J. Stier, M. Arpagaus, Y. Vazdik, M. Nyberg-Werther, T. R. Ebert, A. Fedotov, Günter Flügge, T. P. Yiou, C. Kiesling, A. De Roeck, A. J. Campbell, Richard E. Taylor, T. Ahmed, Th. Wolff, T. Kurča, S. Willard, I. R. Kenyon, H. Spitzer, M. Winde, R. Bernet, P. Uelkes, L. Johnson, H. E. Roloff, Leif J. Jönsson, H. Lohmander, and D. Feeken
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, HERA, Massless particle, Nuclear physics, Particle decay, W and Z bosons, High Energy Physics::Experiment, Neutrino, Lepton
Abstract: A search for direct production of new leptons in the mass range from 10 GeV up to 225 GeV is presented by the H1 experiment at HERA. The data were obtained during 1993 and correspond to an integrated luminosity of 528 nb −1 . The search includes heavy lepton decays to final states e ( ν ) γ and e ( ν ) W , e ( ν ) Z with the subsequent decay of the W and Z bosons into jets or lepton pairs. No evidence was found for the production of new massive electrons or neutrinos in any of the decay channels. Rejection limits for excited electrons and neutrinos are derived.
Published: 1994
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47. Inclusive charged particle cross sections in photoproduction at HERA

Author: T. Jansen, T. Ahmed, Th. Wolff, I. Tichomirov, G. Rädel, L. Criegee, H. Hufnagel, S. Kermiche, J. Formánek, R. D. Appuhn, M. Hampel, Ph. Huet, C.D. Hilton, M. Gebauer, J. Garvey, Ch. Pichler, A. M. Fomenko, I. R. Kenyon, K. Stephens, E. Peppel, M. Gennis, R. C. W. Henderson, S. Levonian, E. Malinovski, M. Kuhlen, H. Spitzer, P. Baranov, J. Tutas, J. D. Burger, Peter Schleper, G. Grindhammer, C. Bourdarios, R. Prosi, A. Buniatian, Marc Besancon, A.S. Belousov, Sergey Rusakov, P. Truöl, G. Lindström, C. Gruber, M. Nyberg, J. Harjes, S. M. Robertson, Dusan Bruncko, K. Flamm, D. Wegener, W.J. Haynes, A. Mavroidis, P. Goritchev, S. K. Kotelnikov, L. Hajduk, W. Flauger, D. Pitzl, R. Roosen, Mikhail Danilov, D. Lewin, Grzegorz Nowak, J. Martyniak, C. Jacobsson, B. Fominykh, Emmanuel Monnier, Eckhart Fretwurst, Fabian Zomer, B. Naroska, F. Ferrarotto, K. Gamerdinger, T. Köhler, M. W. Krasny, H. Genzel, J. Martens, P. I. P. Kalmus, Michel Devel, J. M. Foster, V. Efremenko, Peter Loch, D. Kant, P. Dingus, W. von Schlippe, K. Johannsen, Kerstin Borras, Didier Lacour, T. Merz, R. J. Ellison, G. Cozzika, J. Hladký, A. Braemer, T. Greenshaw, G. Siegmon, J. Feltesse, J. Ebert, F. Eisele, S. Mikocki, C. A. Meyer, J.P. Phillips, W. Pilgram, Christophe Royon, A. Semenov, K. C. Hoeger, J. Žáček, Steve McMahon, U. Kathage, M. Savitsky, A. Gruber, Peter Schacht, G. C. Lopez, J. Haack, H. Bergstein, Th. Naumann, F. Moreau, J. D. Dowell, A. Jacholkowska, Rosario Martín, J. Ferencei, Leith Godfrey, W. Schmitz, V. Brisson, S. Aid, F. Charles, R. Taylor, P. Van Esch, H. Greif, P. Robmann, P. Fuhrmann, N. Magnussen, M. Goldberg, Max Klein, V. Boudry, H. Duhm, E. Vogel, Gregorio Bernardi, C. Niebuhr, Anton Babaev, M. Rudowicz, J. Marks, S. D. Kolya, S. Mani, L. N. Shtarkov, C. Thiebaux, J. Strachota, Hannes Jung, Mario David, Claus Kleinwort, F. Brasse, J. Turnau, J. Cvach, L. Goerlich, A. Drescher, I. Abt, T. P. Yiou, Stephen Burke, L. R. West, U. Bassler, I.F. Fensome, Winston Ko, E. Gabathuler, E. Deffur, D. Feeken, D. Goldner, P. Kostka, Leif J. Jönsson, Guenter Eckerlin, R. Vick, R. Nisius, André Schöning, C. Vallée, M. Steenbock, A. Lindner, S. J. Maxfiedl, Y. Soloviev, I. Sheviakov, A. Usik, E. Barrelet, A. M. Goodall, Volker Blobel, Ch. Berger, R. Eichler, C. Keuker, H. Lohmander, P. A. Smirnov, U. Krüger, E. Evrard, W. Hildesheim, P. R. Newman, B. Andrieu, A. Gellrich, V. Riech, Karlheinz Meier, P. Ribarics, V. Andreev, G. Villet, R. Felst, Pierre Marage, L. Büngener, D. Mercer, F. Lamarche, B. Schwab, M. Eberle, W. Lange, S. Willard, Roland Bernet, J. R. Smith, J. E. Olsson, W. Bartel, I. W. Walker, R. Herma, Hermann Kolanoski, S. Dagoret, Pavel Murin, H. Grässler, J. Moreels, K. Rybicki, D. Clarke, A. Courau, M. Ibbotson, M. Vecko, T. R. Ebert, John A Coughlan, M. Winde, A. Leuschner, Christoph Grab, L. Johnson, H. Ehrlichmann, E. Eisenhandler, M. Hapke, S. Masson, R. Langkau, Horst Oberlack, F. W. Büsser, W. Braunschweig, A. Fedotov, Günter Flügge, B. Delcourt, R. Sell, S. Kazarian, U. Siewert, A. B. Clegg, Andrew Mehta, N. Gogitidze, Laurent Favart, C. Dollfus, S. Reinshagen, U. Stösslein, V I. Shekelyan, R. Haydar, F. Kole, N. Sahlmann, C. Kiesling, Armen Vartapetian, E. Schuhmann, A. De Roeck, P. C. Bosetti, C. Leverenz, K. Wacker, R. Steinberg, B. Stella, A. Rostovtsev, M. Arpagaus, P. Biddulph, R. Ebbinghaus, M. Zimmer, J. Lipinski, Jean-Francois Laporte, Ulrich Goerlach, L. Urban, G. Franke, M. A. Jabiol, B. Kuznik, T. Kurča, R. L. Lander, M. Ruffer, K. Rosenbauer, M. Flieser, S. Orenstein, G. Bertrand-Coremans, H. Bärwolff, S. Eichenberger, Frank Raupach, J. Stier, R. Kaschowitz, Y. Vazdik, Y. Sirois, Jean-Arcady Meyer, M. Jaffré, H. Meyer, N. Wulff, A. Valkárová, P. Kasselmann, G. Thompson, A. Wegner, M. Colombo, M. Fleischer, S. Riess, H. Ziaeepour, W.D. Dau, J. B. Dainton, J. Kurzhöfer, V. Nagovizin, D. Düllmann, Hans Peter Beck, R. Gerhards, P. Hill, A. W. E. Dann, J. P. Kubenka, H. Henschel, J. Bán, Ch. Ley, U. Seehausen, H. J. Behrend, J.C. Bizot, D. Lüers, Murrough Landon, N. Huot, G. W. Noyes, P. Verrecchia, A. E. Wright, K. Müller, P. E. Reimer, H. Shooshtari, V. Schröder, J. Riedlberger, H. H. Kaufmann, Eckhard Elsen, D. Neyret, Nicolas Ellis, Alan Campbell, E. M. Hanlon, H. Itterbeck, S. Peters, H. K. Nguyen, I. V. Gorelov, O. Hamon, G. G. Winter, R. Grässler, Ch. Coutures, W. Struczinski, Vincent Hedberg, G. Knies, P. Steffen, I. O. Skillicorn, H. B. Dreis, H. P. Wellisch, T. Carli, V. Korbel, F. Linsel, J. Heatherington, D. Newton, P. Lanius, V. Tchernyshov, M. Korn, G. Weber, U. Straumann, H. U. Martyn, F. Ould-Saada, M. Höppner, S. Prell, S. A. Murray, J. Chyla, Martin Erdmann, U. Obrock, F. Niebergall, J. Duboc, C. Schmidt, J. P. Sutton, P. Di Nezza, U. Braun, K. Rauschnabel, E. Binder, H.T. Phillips, M. Schulz, J. Gayler, E. Sanchez, L. Del Buono, O. Dünger, R. Marshall, Dirk Krücker, H. Krehbiel, G. Buschhorn, I. Herynek, L.A. Womersley, A. Walther, W. Zimmermann, J. V. Morris, M. Forbush, A. Schwind, C. Pascaud, A. Lebedev, S. Egli, M. Rietz, D. Haidt, G. Heinzelmann, S. Valkar, H. Küster, D. Lüke, C. Zeitnitz, Dave Sankey, G. D. Patel, W. Scobel, D.P. Johnson, and David Schmidt
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Wire chamber, Particle physics, Elementary particle, HERA, Charged particle, Nuclear physics, Particle mass, Pseudorapidity, Transverse momentum, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Cross sections are presented for the inclusive production of charged particles measured in electron-proton collisions at low Q 2 with the H1 detector at HERA. The transverse momentum distribution extends up to 8 GeV/ c . Its shape is found to be harder than that observed in p p collisions at comparable centre-of-mass energies √S γp ≈ √S p p ≈ 200 GeV , and also harder than in γp collisions at lower energies √ S γp ≈ 18 GeV. Results from quantum chromodynamics (QCD) calculations agree with the measured transverse momentum and pseudorapidity cross sections.
Published: 1994
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48. First measurement of the charged current cross section at HERA

Author: T. Ahmed, V. Andreev, B. Andrieu, R.-D. Appuhn, M. Arpagaus, A. Babaev, J. Bán, P. Baranov, E. Barrelet, W. Bartel, M. Barth, U. Bassler, H.P. Beck, H.-J. Behrend, A. Belousov, Ch. Berger, H. Bergstein, G. Bernardi, R. Bernet, G. Bertrand-Coremans, M. Besançon, P. Biddulph, J.C. Bizot, V. Blobel, K. Borras, V. Boudry, A. Braemer, F. Brasse, W. Braunschweig, V. Brisson, D. Bruncko, C. Brune, L. Büngener, J. Bürger, F.W. Büsser, A. Buniatian, S. Burke, G. Buschhorn, A.J. Campbell, T. Carli, F. Charles, D. Clarke, A.B. Clegg, M. Colombo, J.A. Coughlan, A. Courau, Ch. Coutures, G. Cozzika, L. Criegee, D.G. Cussans, J. Cvach, S. Dagoret, J.B. Dainton, M. Danilov, A.W.E. Dann, W.D. Dau, K. Daum, M. David, E. Deffur, B. Delcourt, L. Del Buono, A. De Roeck, E. De Wolf, C. Dollfus, J.D. Dowell, H.B. Dreis, J. Duboc, D. Düllmann, O. Dünger, H. Duhm, J. Ebert, T.R. Ebert, G. Eckerlin, V. Efremenko, S. Egli, H. Ehrlichmann, S. Eichenberger, R. Eichler, F. Eisele, E. Eisenhandler, R.J. Ellison, E. Elsen, M. Erdmann, E. Evrard, L. Favart, A. Fedotov, D. Feeken, R. Felst, J. Feltesse, J. Ferencei, F. Ferrarotto, K. Flamm, W. Flauger, M. Fleischer, M. Flieser, G. Flügge, A. Fomenko, B. Fominykh, M. Forbush, J. Formánek, J.M. Foster, G. Franke, E. Fretwurst, E. Gabathuler, K. Gamerdinger, J. Garvey, J. Gayler, M. Gebauer, A. Gellrich, H. Genzel, R. Gerhards, U. Goerlach, L. Goerlich, N. Gogitidze, M. Goldberg, D. Goldner, A.M. Goodall, I. Gorelov, P. Goritchev, C. Grab, H. Grässler, R. Grässler, T. Greenshaw, G. Grindhammer, C. Gruber, J. Haack, D. Haidt, L. Hajduk, O. Hamon, M. Hampel, E.M. Hanlon, M. Hapke, W.J. Haynes, J. Heatherington, V. Hedberg, G. Heinzelmann, R.C.W. Henderson, H. Henschel, R. Herma, I. Herynek, W. Hildesheim, P. Hill, C.D. Hilton, J. Hladký, K.C. Hoeger, M. Höppner, Ph. Huet, H. Hufnagel, M. Ibbotson, H. Itterbeck, M.-A. Jabiol, A. Jacholkowska, C. Jacobsson, M. Jaffre, J. Janoth, T. Jansen, L. Jönsson, K. Johannsen, D.P. Johnson, L. Johnson, H. Jung, P.I.P. Kalmus, D. Kant, S. Kazarian, R. Kaschowitz, P. Kasselmann, U. Kathage, H.H. Kaufmann, I.R. Kenyon, S. Kermiche, C. Keuker, C. Kiesling, M. Klein, C. Kleinwort, G. Knies, W. Ko, T. Köhler, H. Kolanoski, F. Kole, S.D. Kolya, V. Korbel, M. Korn, P. Kostka, S.K. Kotelnikov, M.W. Krasny, H. Krehbiel, D. Krücker, U. Krüger, M. Krüner-Marquis, J.P. Kubenka, H. Küster, M. Kuhlen, T. Kurča, J. Kurzhöfer, B. Kuznik, D. Lacour, F. Lamarche, R. Lander, M.P.J. Landon, W. Lange, P. Lanius, J.F. Laporte, A. Lebedev, C. Leverenz, S. Levonian, Ch. Ley, A. Lindner, G. Lindström, F. Linsel, J. Lipinski, P. Loch, H. Lohmander, G.C. Lopez, D. Lüers, D. Lüke, N. Magnussen, E. Malinovski, S. Mani, P. Marage, R. Marshall, J. Martens, R. Martin, H.-U. Martyn, J. Martyniak, S. Masson, A. Mavroidis, S.J. Maxfield, S.J. McMahon, A. Mehta, K. Meier, D. Mercer, T. Merz, C.A. Meyer, H. Meyer, J. Meyer, S. Mikocki, V. Milone, D. Milstead, F. Moreau, J.V. Morris, G. Müller, P. Murín, V. Nagovizin, B. Naroska, Th. Naumann, G. Nawrath, P.R. Newman, D. Newton, D. Neyret, H.K. Nguyen, F. Niebergall, C. Niebuhr, R. Nisius, G. Nowak, G.W. Noyes, M. Nyberg-Werther, H. Oberlack, U. Obrock, J.E. Olsson, A. Panitch, C. Pascaud, G.D. Patel, E. Peppel, E. Perez, J.P. Phillips, Ch. Pichler, D. Pitzl, G. Pope, S. Prell, R. Prosi, G. Rädel, F. Raupach, P. Reimer, S. Reinshagen, P. Ribarics, V. Riech, J. Riedlberger, S. Riess, M. Rietz, S.M. Robertson, P. Robmann, R. Roosen, K. Rosenbauer, A. Rostovtsev, C. Royon, K. Rüter, M. Ruffer, S. Rusakov, K. Rybicki, N. Sahlmann, E. Sanchez, D.P.C. Sankey, M. Savitsky, P. Schacht, P. Schleper, W. von Schlippe, C. Schmidt, D. Schmidt, A. Schöning, V. Schröder, M. Schulz, B. Schwab, A. Schwind, U. Seehausen, F. Sefkow, R. Sell, A. Semenov, V. Shekelyan, I. Sheviakov, H. Shooshtari, L.N. Shtarkov, G. Siegmon, U. Siewert, Y. Sirois, I.O. Skillicorn, P. Smirnov, J.R. Smith, Y. Soloviev, H. Spitzer, P. Staroba, M. Steenbock, P. Steffen, R. Steinberg, B. Stella, K. Stephens, J. Stier, J. Stiewe, U. Stösslein, J. Strachota, U. Straumann, W. Struczinski, J.P. Sutton, S. Tapprogge, R.E. Taylor, V. Tchernyshov, C. Thiebaux, G. Thompson, I. Tichomirov, P. Truöl, J. Turnau, J. Tutas, A. Usik, S. Valkar, A. Valkarova, C. Vallée, P. Van Esch, P. Van Mechelen, A. Vartapetian, Y. Vazdik, M. Vecko, P. Verrecchia, G. Villet, K. Wacker, A. Wagener, I.W. Walker, A. Walther, G. Weber, M. Weber, D. Wegener, A. Wegner, H.P. Wellisch, L.R. West, S. Willard, M. Winde, G.-G. Winter, Th. Wolff, A.E. Wright, E. Wünsch, N. Wulff, T.P. Yiou, J. Žáček, Z. Zhang, M. Zimmer, W. Zimmermann, F. Zomer, and K. Zuber
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Propagator, Elementary particle, HERA, Nuclear physics, Cross section (physics), Transverse plane, High Energy Physics::Experiment, Nuclear Experiment, Charged current
Abstract: The cross section of the charged current process e − p → v e + hadrons is measured at HERA for transverse momenta of the hadron system larger than 25 GeV. The size of the cross section exhibits the W propagator.
Published: 1994
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49. Scaling violations of the proton structure function F2 at small x

Author: F. Kole, B. Schwab, Petr Zavada, Pavel Murin, H. Grässler, M. Ibbotson, M. Schulz, D. Lüers, F. Charles, R. Taylor, N. Magnussen, Steve McMahon, Armen Vartapetian, Th. Wolff, Pavel Staroba, P. Verrecchia, H. Spitzer, Richard Nisius, Michel Devel, M. Colombo, E. Evrard, W.D. Dau, J. B. Dainton, Claire Bourdarios, Laurent Favart, C. Dollfus, J. Turnau, M. Steenbock, B. Andrieu, N. Sahlmann, V. Korbel, J. E. Olsson, W. Bartel, Stephen Maxfield, Kerstin Borras, C. Pascaud, V. Schröder, W. von Schlippe, H. H. Kaufmann, Eckhard Elsen, R. Marshall, Dirk Krücker, I. Tichomirov, Murrough Landon, A. E. Wright, G. Lindström, B. Delcourt, G. Bertrand-Coremans, J. Feltesse, Ulrich Goerlach, R. Kaschowitz, R. Ebbinghaus, A. B. Clegg, N. Gogitidze, F. W. Büsser, W. Braunschweig, K. C. Hoeger, Leif J. Jönsson, H. Hufnagel, Alexandre Lebedev, H. Lohmander, L. Criegee, A. Semenov, J. Riedlberger, M. Nyberg, S. Egli, M. Rietz, T. Merz, S. Kasarian, U. Stösslein, C. Leverenz, J. Žáček, Max Klein, L.A. Womersley, J. Formánek, M. A. Jabiol, V. Riech, R. Sell, A. Valkárová, S. Orenstein, J. Harjes, S. M. Robertson, S. Riess, G. Heinzelmann, Mario David, S. Kermiche, E. Barrelet, Tancredi Carli, I. R. Kenyon, S. Reinshagen, A. Walther, C.D. Hilton, Fabian Zomer, M. Hapke, F. Linsel, P. A. Smirnov, A. Lindner, L. N. Shtarkov, U. Bassler, Ch. Berger, Karlheinz Meier, J. Ebert, U. Siewert, F. Brasse, W. Zimmermann, Hans Peter Beck, H. Itterbeck, S. Peters, M. Zimmer, E. Malinovski, M. Kuhlen, Vincent Boudry, A. Buniatian, Mikhail Danilov, J. Heatherington, R. C. W. Henderson, I. F. Fensome, Volker Blobel, K. Stephens, E. Peppel, D. Newton, D. Lewin, L. Büngener, V. Milone, S. Eichenberger, G. Cozzika, D. Wegener, W.J. Haynes, Jean-Francois Laporte, Jean-Arcady Meyer, R. Eichler, C. Keuker, R. Roosen, H. Shooshtari, G. Grindhammer, J. Martyniak, R. Gerhards, A. Drescher, O. Hamon, M. Fleischer, Ch. Ley, Dave Sankey, D. Handschuh, I. Herynek, P. Lanius, Emmanuel Monnier, S. A. Murray, S. Levonian, H. Krehbiel, T. Köhler, M. W. Krasny, P. E. Reimer, B. Fominykh, E. M. Hanlon, V. Tchernyshov, Stefan Valkar, M. Arpagaus, J. Duboc, B. Stella, H. T. Phillips, H. Greif, P. Hill, J. Bán, P. Ribarics, C. Niebuhr, R. Felst, G. D. Patel, H. Meyer, Paul Newman, K. Flamm, A. Mavroidis, V. Efremenko, Hannes Jung, G. Buschhorn, Daniel Pitzl, G. G. Winter, S. Mani, R. M. Martin, J. Tutas, J. D. Burger, M. Rudowicz, M. Eberle, L. Smolik, U. Seehausen, Grzegorz Nowak, Eckhart Fretwurst, M. Korn, P. I. P. Kalmus, David Schmidt, Vincent Hedberg, G. Knies, S. Mikocki, P. Steffen, C. Vallée, P. Biddulph, I. Abt, Stephen Burke, Martin Erdmann, R. Prosi, U. Obrock, F. Niebergall, Nicolas Ellis, G. Weber, U. Straumann, J. V. Morris, H. P. Wellisch, A. Wegner, T. Ahmed, K. Johannsen, J. R. Smith, R. Herma, Christophe Royon, A. Usik, R. D. Appuhn, E. Eisenhandler, Y. Soloviev, T. Kurca, S. K. Kotelnikov, L. Hajduk, M. Jaffré, H. K. Nguyen, I. V. Gorelov, K. Müller, P. Dingus, A. M. Goodall, M. Forbush, P. Baranov, H. Ziaeepour, R. Grässler, Ch. Coutures, W. Struczinski, Peter Schacht, G. C. Lopez, C. A. Meyer, J. Kurzhöfer, A. Schwind, V. Nagovizin, M. Vecko, Peter Schleper, J. Haack, A. W. E. Dann, C. Zeitnitz, Rudolf Langkau, H. Küster, W. Schmitz, A. Gellrich, V. Andreev, M. Rüffer, J. M. Foster, R. J. Ellison, F. Lamarche, M. Savitsky, I. O. Skillicorn, H. B. Dreis, I. W. Walker, K. Rybicki, J. P. Kubenka, Marc Besancon, P. Fuhrmann, A.S. Belousov, D. Düllmann, H. U. Martyn, Sergey Rusakov, P. Truöl, Peter Loch, Winston Ko, Didier Lacour, Guenter Eckerlin, Daniel Johnson, E. Vogel, G. W. Noyes, M. Gennis, H. Henschel, H. J. Behrend, J.C. Bizot, M. Goldberg, Hermann Kolanoski, D. Clarke, John A Coughlan, W. Pilgram, J. Cvach, Gregorio Bernardi, Anton Babaev, C. Thiebaux, Horst Oberlack, A. Leuschner, Christoph Grab, L. Goerlich, R. Vick, André Schöning, I. Sheviakov, G. Villet, Pierre Marage, Yves Sirois, Frank Raupach, J. Strachota, U. Krüger, A. Courau, Roland Bernet, J. Lipinski, K. Gamerdinger, S. Dagoret, J. Garvey, J. Hladký, F. Eisele, G. Franke, V I. Shekelyan, A. M. Fomenko, J. D. Dowell, R. Haydar, P. C. Bosetti, G. Siegmon, Wolfgang Scobel, Ankita Mehta, N. Wulff, K. Wacker, R. Steinberg, E. J. Sanchez, N. Huot, P. Goritchev, Dusan Bruncko, P. Kasselmann, B. Naroska, F. Ferrarotto, H. Genzel, T. Greenshaw, D. Neyret, J.P. Phillips, D. Feeken, W. Hildesheim, R. L. Lander, J. Ferencei, H. Bärwolff, P. Van Esch, J. Marks, A. Rostovtsev, Claus Kleinwort, F. Moreau, S. Willard, A. Jacholkowska, M. Winde, S. D. Kolya, L. Johnson, T. Jansen, G. Rädel, B. Kuznik, Ph. Huet, Ch. Pichler, C. Gruber, W. Flauger, K. Rauschnabel, Wolfgang Lange, E. Binder, J. Gayler, G. Thompson, S. Prell, C. Jacobsson, U. Kathage, C. Schmidt, J. P. Sutton, U. Braun, H. Bergstein, Peter Robmann, Th. Naumann, L. Del Buono, A. Bischoff, H. Duhm, E. Gabathuler, E. Deffur, O. Dünger, P. Kostka, J. Moreels, T. R. Ebert, A. Fedotov, Günter Flügge, T. P. Yiou, C. Kiesling, A. De Roeck, A. J. Campbell, Farid Ould-Saada, Leith Godfrey, L. Urban, M. Flieser, D. Mercer, J. Stier, Y. Vazdik, L.R. West, S. Masson, J. Martens, Laboratoire Leprince-Ringuet (LLR), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-École polytechnique (X)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de Physique Nucléaire et de Hautes Énergies (LPNHE), Université Pierre et Marie Curie - Paris 6 (UPMC)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Paris Diderot - Paris 7 (UPD7)-Centre National de la Recherche Scientifique (CNRS), Laboratoire de l'Accélérateur Linéaire (LAL), Université Paris-Sud - Paris 11 (UP11)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Centre National de la Recherche Scientifique (CNRS), and H1
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Distribution function, Proton, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], Range (statistics), Perturbative QCD, HERA, Event (particle physics), Scaling, Gluon
Abstract: An analysis is presented of scaling violations of the proton structure function F 2 ( x , Q 2 ) measured with the H1 detector at HERA in the range of Bjorken x values between x = 3 × 10 −4 and 10 −2 for four-momentum transfers Q > 2 larger than 8.7 GeV 2 . The structure function F 2 ( x , Q 2 ) is observed to rise linearly with ln Q 2 . Under the assumption that the observed scaling violations at small x ⩽ 0.01 are described correctly by perturbative QCD, an estimate is obtained of the gluon distribution function G ( x , Q 0 2 ) at Q 2 2 = 20 GeV 2 .
Published: 1994
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50. Measurement of the proton structure function F2 (x, Q2) in the low-x region at HERA

Author: Steve McMahon, C. A. Meyer, G. Siegmon, A. Drescher, P. Fuhrmann, F. Moreau, J. Hladký, J. D. Dowell, A. Jacholkowska, A. Lebedev, S. Egli, G. Villet, L. Goerlich, S. D. Kolya, M. Rietz, D. Haidt, Pierre Marage, G. Heinzelmann, A. Courau, H. Küster, A. Usik, N. Magnussen, R. C. W. Henderson, N. Sahlmann, P. Biddulph, M. Colombo, J. V. Morris, Frank Raupach, R. Ebbinghaus, M. A. Jabiol, A. E. Wright, J. Tutas, J. D. Burger, N. Wulff, R. Prosi, P. Kasselmann, D. P. C. Sankey, U. Bassler, Daniel Pitzl, M. Forbush, V. Milone, A. Schwind, M. Jaffre, J. E. Olsson, W. Bartel, H. Itterbeck, S. Peters, R. Felst, S. K. Kotelnikov, L. Hajduk, M. Eberle, F. W. Büsser, W. Braunschweig, R. Sell, C. Zeitnitz, V. Korbel, K. C. Hoeger, T. Jansen, U. Siewert, M. Zimmer, Vincent Boudry, Jean-Francois Laporte, G. D. Patel, H. Meyer, Peter Loch, W. Scobel, Vincent Hedberg, G. Rädel, G. Knies, B. Kuznik, Ph. Huet, W. Pilgram, D. Lüers, Ch. Pichler, D.P. Johnson, David Schmidt, J. Haack, I. O. Skillicorn, H. B. Dreis, Ch. Ley, Peter Schacht, G. C. Lopez, W. Schmitz, V. Riech, M. Hapke, R. Bernet, Pavel Staroba, Kerstin Borras, E. Vogel, Gregorio Bernardi, Anton Babaev, G. Cozzika, F. Eisele, A. Buniatian, D. Wegener, W. von Schlippe, A. Semenov, T. Merz, J. Turnau, J. Strachota, W.J. Haynes, P. Verrecchia, I.F. Fensome, P. Goritchev, Stefan Valkar, M. Steenbock, A. Lindner, Volker Blobel, C. Keuker, R. Roosen, Emmanuel Monnier, V. Schröder, S. Kasarian, K. Gamerdinger, T. Köhler, D. Neyret, S. Levonian, K. Rauschnabel, Wolfgang Lange, B. Andrieu, Hannes Jung, K. Johannsen, B. Schwab, C. Vallée, E. Malinovski, Pavel Murin, D. Mercer, H. Grässler, J. Riedlberger, H. K. Nguyen, F. Brasse, E. Binder, M. Ibbotson, H. H. Kaufmann, Eckhard Elsen, Leif J. Jönsson, M. Nyberg, J. Harjes, Christophe Royon, P. Baranov, Laurent Favart, C. Dollfus, I. V. Gorelov, K. Müller, J. Gayler, Jean-Arcady Meyer, V. Efremenko, Mario David, F. Linsel, Peter Schleper, Ulrich Goerlach, R. Grässler, Ch. Coutures, W. Struczinski, J. Heatherington, J. M. Foster, R. Kaschowitz, S. M. Robertson, R. Gerhards, P. Závada, E. Evrard, M. Savitsky, E. Sanchez, S. Riess, M. Kuhlen, H. Lohmander, G. Grindhammer, S. Mikocki, K. Flamm, A. Mavroidis, D. Newton, L. N. Shtarkov, Leith Godfrey, Marc Besancon, J. Cvach, F. Zomer, A. M. Goodall, L. Del Buono, Winston Ko, B. Delcourt, A.S. Belousov, Sergey Rusakov, U. Stösslein, P. Lanius, C. Pascaud, I. W. Walker, K. Rybicki, J. Duboc, B. Stella, S. Kermiche, P. I. P. Kalmus, P. Hill, J. Bán, P. Truöl, Mikhail Danilov, Peter Robmann, D. Lewin, H. Greif, L. Criegee, Stephen Maxfield, C. Leverenz, V. Tchernyshov, A. Leuschner, Christoph Grab, O. Hamon, Nicolas Ellis, Guenter Eckerlin, J. Martyniak, E. Barrelet, R. Vick, M. Vecko, A. B. Clegg, Andrew Mehta, T. Ahmed, J. Formánek, A. Bischoff, Th. Wolff, M. Rudowicz, Yves Sirois, H. Shooshtari, I. R. Kenyon, I. Abt, M. Korn, J. Lipinski, R. Nisius, B. Fominykh, G. Franke, J. Žáček, S. Masson, R. Langkau, M. Ruffer, Armen Vartapetian, G. Thompson, S. Orenstein, G. Weber, U. Straumann, H. Spitzer, Ch. Berger, O. Dünger, J. Ebert, R. J. Ellison, L.A. Womersley, R. L. Lander, H. Bärwolff, A. Gellrich, F. Lamarche, S. Mani, R. D. Appuhn, D. Düllmann, J. R. Smith, H. P. Beck, Eckhart Fretwurst, S. Eichenberger, H. Henschel, Stephen Burke, R. Herma, I. Tichomirov, E. Eisenhandler, L. Büngener, J. Martens, H. J. Behrend, J.C. Bizot, M. Goldberg, M. Gennis, M. Fleischer, Hermann Kolanoski, D. Clarke, Michel Devel, John A Coughlan, K. Meier, Horst Oberlack, A. Walther, S. Prell, F. Kole, G. Bertrand-Coremans, G. Lindström, C. Gruber, W. Flauger, L. Smolik, U. Seehausen, H. Hufnagel, W. Zimmermann, I. Herynek, J. Garvey, A. M. Fomenko, A. Wegner, C.D. Hilton, P. Kotska, Grzegorz Nowak, C. Jacobsson, C. Schmidt, J. P. Sutton, U. Braun, N. Huot, H. Ziaeepour, H.T. Phillips, M. Schulz, J. Kurzhöfer, V. Nagovizin, W.D. Dau, A. W. E. Dann, J. B. Dainton, R. Eichler, M. W. Krasny, Claire Bourdarios, R. Marshall, Dirk Krücker, U. Kathage, D. Handschuh, K. Stephens, E. Peppel, H. Krehbiel, V. Brisson, J. P. Kubenka, C. Thiebaux, G. Buschhorn, G. W. Noyes, P. Dingus, J. Feltesse, Max Klein, P. A. Smirnov, F. Charles, I. Sheviakov, U. Krüger, J. Stier, J. Marks, S. Dagoret, Y. Vazdik, H. Bergstein, Th. Naumann, Vladimir Andreev, H. U. Martyn, H. Duhm, V I. Shekelyan, R. Haydar, P. C. Bosetti, E. Gabathuler, E. Deffur, K. Wacker, P. Ribarics, R. Steinberg, Y. Soloviev, J. Moreels, T. R. Ebert, Dusan Bruncko, P. E. Reimer, Alan Campbell, E. M. Hanlon, G. G. Winter, A. Fedotov, Günter Flügge, T. P. Yiou, P. Steffen, B. Naroska, F. Ferrarotto, H. P. Wellisch, C. Kiesling, A. De Roeck, T. Carli, Richard E. Taylor, F. Ould-Saada, H. Genzel, L. Urban, T. Kurča, T. Greenshaw, J.P. Phillips, Rosario Martín, J. Ferencei, P. Van Esch, A. Rostovtsev, Claus Kleinwort, S. Reinshagen, M. Arpagaus, W. Hildesheim, S. Willard, M. Winde, L. Johnson, D. Feeken, A. Valkarova, S. A. Murray, Martin Erdmann, U. Obrock, F. Niebergall, and M. P. J. Landon
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Range (particle radiation), Luminosity (scattering theory), Neutral current, Proton, Detector, Elementary particle, HERA, Atomic physics, Deep inelastic scattering
Abstract: A measurement of the proton structure function F2 (x, Q2) is presented with about 1000 neutral current deep inelastic scattering events for Bjorken x in the range x ⋍ 10−2 – 10−4 and Q2 > 5 GeV2. The measurement is based on an integrated luminosity of 22.5 nb−1 recorded by the H1 detector in the first year of HERA operation. The structure function F2 (x, Q2) shows a significant rise with decreasing x.
Published: 1993
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