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1. 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

2. 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

3. 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

4. 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

5. 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

6. 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

7. Comparisons of the properties of final state photons in hadronic Z0 decays with predictions from matrix element calculations

Author: D. R. Rust, A. M. Lee, N. K. Watson, R. Van Kooten, D. M. Gingrich, Madjid Boutemeur, P. Berlich, Matthias Schröder, R. F. Hughes-Jones, C. Y. Chang, E. Lefebvre, C. Dallapiccola, M. Fanti, Margret Fincke-Keeler, S. Braibant, R. Bartoldus, P. G. Estabrooks, C. M. Hawkes, Daniel Lellouch, P. Taras, F. Odorici, R. W. Springer, J. D. Gillies, P. Szymanski, P. Igo-Kemenes, R. D. Heuer, Fabrizio Fabbri, Michael Kobel, Tohru Takeshita, H. Jeremie, Takehiko Mori, J. Steuerer, G. A. Snow, C. P. Ward, M. J. Oreglia, U. Maur, Georges Azuelos, Barry King, H. O. Ogren, Christoph Geich-Gimbel, D. L. Rees, S. Söldner-Rembold, P. M. Watkins, V. Zacek, K. W. Bell, Julie Kirk, H. Lafoux, R. J. Barlow, C. Jui, D. J. Miller, Stephen Lloyd, Tara Shears, W. Mohr, Stan Bentvelsen, J. C. Hill, Misao Sasaki, M. Tecchio, B. C. Shen, A. Posthaus, P. A. Hart, Siegfried Bethke, M. J. Pearce, E. do Couto e Silva, P. Poffenberger, D. E. Plane, T. Hilse, Silvia Arcelli, Ehud Duchovni, Shlomo Dado, D. Rigby, R. J. Hemingway, A. K. Honma, B. Nijjhar, W. G. Scott, J. R. Carter, G. N. Patrick, O. Biebel, Peter Fischer, G. M. Dallavalle, M. Jimack, O. Runolfsson, H. Mes, F. X. Gentit, Hans-Christian Schultz-Coulon, P. A. Elcombe, R. Lahmann, I. P. Duerdoth, G. A. Beck, D. C. Imrie, Randall Sobie, Michael Schulz, G. D. Lafferty, P. Schütz, C. Darling, B. W. Kennedy, F. Palmonari, P. Jovanovic, T. J. Smith, J. E. Conboy, A. Fürtjes, Alan Watson, Achim Stahl, P. Teixeira-Dias, P. Fath, M. J. Losty, Austin Ball, S. W. Gensler, Marco Cuffiani, C. Beeston, Peter Krieger, S. J. Hillier, T. Kobayashi, D. L. Wagner, Claudio Grandi, G. W. Wilson, U. Müller, W. P. Lai, G. P. Siroli, J. King, T. W. Pritchard, P. Mättig, Shoji Asai, D. Hochman, Manuella Vincter, Alessandro Montanari, M. Hauschild, S. L. Chu, Giora Mikenberg, H. Deng, B. Schmitt, F. Scharf, Christoph Schwick, I. J. Bloodworth, K. Stephens, C. Markus, Guenter Duckeck, J. M. Roney, O. C. Cooke, R. Mir, Reda Tafirout, F. S. Merritt, A. D. Schaile, O. Tousignant, M. Settles, J. Lauber, R. Kowalewski, J. Letts, A. S. Turcot, Yoram Rozen, C. K. Hargrove, Kiyotomo Kawagoe, W. Matthews, V. Gibson, S. W. O'Neale, M. Foucher, H. Takeda, Norbert Wermes, Sherry Towers, T. Kawamoto, K. J. Anderson, N. Capdevielle, J. von Krogh, M. A. Thomson, Paolo Giacomelli, F. G. Oakham, K. Ametewee, M. Hansroul, S. G. Clowes, V. H. Winterer, M. Fierro, J. E.G. Edwards, M. Yurko, W. R. Gibson, Junichi Kanzaki, E. L. Barberio, Gideon Alexander, E. K. U. Gross, Gregor Herten, Dave Robinson, D. Karlen, C. Burgard, P. W. Jeffreys, S. Orito, P. Weber, J. A. McKenna, M. Rosvick, A. Gaidot, C. H. Shepherd-Themistocleous, Paolo Capiluppi, T. Wlodek, M. Sproston, L. A. del Pozo, B. Wilkens, D. R. Ward, T. Kress, C. Sbarra, A. Beck, R. J. Homer, T. Behnke, J. C. Clayton, E. Heflin, Michael Dittmar, P. Bright-Thomas, R. M. Brown, G. Yekutieli, T. Tsukamoto, N. Tesch, Lorne Levinson, P. D. Phillips, P. Gagnon, J. E. Pilcher, J. J. Ward, P. Vikas, Gilles Beaudoin, A. A. Carter, Ron Folman, A. Skillman, Roger Jones, G. T. Zorn, N. J. Oldershaw, P. Utzat, H. M. Bosch, Wolfram Dietrich Zeuner, M. G. Rison, D. Axen, A. Jawahery, T. J. McMahon, R.J. Akers, Peter Sherwood, J. Schwiening, R. K. Carnegie, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, J. A. Wilson, O. Schaile, B. Stockhausen, Paul Kyberd, F. K. Loebinger, M. Starks, G. G. Hanson, R. Giacomelli, A. J. Martin, J. Stamm, G. Giacomelli, John Allison, P. Schenk, A. Buijs, D. M. Strom, C. Stegmann, R. G. Kellogg, Andris Skuja, Stefano Marcellini, G. D. Long, H. Fukui, Tetsuro Mashimo, M. S. Dixit, M. W. Redmond, Frans Meijers, W. Gorn, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, P. Scharff-Hansen, A. M. Smith, J. P. Martin, G. Vasseur, B. Lorazo, M. Tscheulin, James Pinfold, S. De Jong, Richard Keeler, D. G. Fong, J. Gascon, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, H. Przysiezniak, R. Howard, Claude Leroy, J. P. Pansart, J. G. Layter, C. Charlesworth, P. S. Wells, Terry Richard Wyatt, Gideon Bella, H. J. Burckhart, Jacqueline Batley, Xinchou Lou, Dave Charlton, R. Bürgin, B. Fabbro, N. I. Geddes, N. L. Rodning, B. Poli, A. I. McNab, A. M. Rossi, J. Goldberg, H. M. Fischer, A. Michelini, B. Nellen, S. A. Robins, P. Leblanc, H. G. Evans, M. J. Goodrick, I. Cohen, Gunter Wolf, S. Wotton, Erez Etzion, Stefan Kluth, Shlomit Tarem, C. J. Oram, R. P. Middleton, Sachio Komamiya, Theodoros Geralis, E. Ros, T. P. Kokott, A. Luig, A. Yeaman, M. F. Turner-Watson, M. Morii, Peter R Hobson, and P. Routenburg
Subjects: Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Elementary particle, Jet (particle physics), Nuclear physics, Phase space, High Energy Physics::Experiment, Field theory (psychology), Quantum field theory, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The properties of hadronic Z0 decays with final state photons, measured with OPAL at LEP, have been compared with predictions from two different matrix element calculations ofO(ααs). Two calculations, GNJETS and EEPRAD, have been investigated which use different schemes to restrict the phase space around the poles of the cross section. Assuming the E0-JADE jet definition, both calculations describe the data well in large regions of phase space forycut values around 0.06. For very large and very small jet-photon masses some deviations from the predictions have been found, indicating the importance of higher order corrections. Significant differences between the calculations are only apparent in the predicted rate of 1-jet plus photon events. The rate is higher in GNJETS which reproduces the data better than EEPRAD.
Published: 1995

8. Measurement of $$\Gamma (Z^0 \to b\bar b)/\Gamma (Z^0 \to hadrons)$$ using a double tagging method

Author: H. J. Burckhart, Jacqueline Batley, P. Igo-Kemenes, H. Jeremie, P. Scharff-Hansen, R. E. Hughes-Jones, U. Maur, A. Höcker, D. Axen, A. Jawahery, R. Van Kooten, E. do Couto e Silva, D. Pitman, A. M. Smith, Shlomo Dado, Xinchou Lou, Peter Sherwood, R. W. Springer, Alexander Wagner, M. H. Lehto, G. Vasseur, H. Mes, J. Hagemann, J. Ludwig, K. Runge, P. Bock, Giora Mikenberg, B. Lorazo, I. P. Duerdoth, G. G. Hanson, A. I. McNab, J. Goldberg, Otmar Biebel, T. G. Shears, B. Nellen, P. Leblanc, D. G. Charlton, D. L. Wagner, H. Deng, R. Humbert, D. M. Gingrich, F. Liu, R. Mir, J. von Krogh, Andris Skuja, H. Przysiezniak, P. Schenk, S. Braibant, C. M. Hawkes, D. A. Hinshaw, Daniel Lellouch, G. A. Snow, C. P. Ward, R. Bartoldus, D. L. Rees, S. G. Clowes, J. Lauber, M. Fierro, M. S. Dixit, Z. Li, Frans Meijers, G. D. Long, Tetsuro Mashimo, H. G. Evans, Dave Robinson, Takehiko Mori, P. Berlich, H. Takeda, F. G. Oakham, H. O. Ogren, M. J. Goodrick, M. Yurko, P. W. Jeffreys, T. J. McMahon, M. Hauschild, I. Cohen, M. F. Turner-Watson, M. Morii, J. G. Layter, S. W. O'Neale, E. L. Barberio, Christoph Geich-Gimbel, Norbert Wermes, Sherry Towers, T. Kawamoto, K. J. Anderson, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, J. Schwiening, Peter R Hobson, R. Kowalewski, J. Hart, R. K. Carnegie, T. Behnke, C. Markus, P. Le Du, B. Fabbro, C. Charlesworth, E. Lefebvre, C. Dallapiccola, J. D. Gillies, J. A. Wilson, W. Gorn, P. Routenburg, D. R. Rust, T. W. Pritchard, A. Skillman, P. A. Hart, P. Bright-Thomas, I. J. Bloodworth, S. Orito, M. Rosvick, Tohru Takeshita, F. Odorici, D. E. Plane, J. C. Clayton, G. Giacomelli, S. L. Chu, Gunter Wolf, F. X. Gentit, Guenter Duckeck, A. Buijs, Gideon Alexander, P. Bentkowski, T. Wlodek, Paolo Capiluppi, R. J. Barlow, D. M. Strom, C. Stegmann, C. Y. Chang, M. J. Pearce, D. J. Miller, G. M. Dallavalle, M. Sproston, J. J. Ward, M. A. Thomson, A. M. Lee, M. Settles, Yoram Rozen, M. Foucher, P. Gagnon, R.J. Akers, M. J. Oreglia, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, J. P. Martin, Georges Azuelos, Barry King, Paolo Giacomelli, T. Tsukamoto, H. Fukui, M. Hansroul, Michael Kobel, N. Tesch, S. Wotton, Silvia Arcelli, R. Ströhmer, P. A. Elcombe, O. Schaile, J. E. Conboy, A. Fürtjes, S. De Jong, J. F. Kral, K. W. Bell, C. Sbarra, V. H. Winterer, T. Hilse, G. T. Zorn, D. Rigby, R. J. Hemingway, O. Runolfsson, G. W. Wilson, D. Karlen, C. Burgard, B. W. Kennedy, A. Yeaman, P. D. Grannis, J. R. Carter, G. N. Patrick, M. Fanti, J. Becker, Erez Etzion, Stephen Lloyd, M. Tecchio, Robert M Brown, Matthias Schröder, James Pinfold, A. J. Martin, P. Jovanovic, H. Lafoux, H. M. Bosch, Wolfram Dietrich Zeuner, D. G. Fong, F. S. Merritt, Michael Dittmar, Austin Ball, C. H. Shepherd-Themistocleous, C. Beeston, Peter Krieger, Claudio Grandi, F. Scharf, Stefan Kluth, Shlomit Tarem, J. C. Hill, Misao Sasaki, P. Poffenberger, P. Szymanski, Peter Fischer, Manuella Vincter, Alessandro Montanari, Sachio Komamiya, G. Yekutieli, B. C. Shen, Theodoros Geralis, E. Ros, A. T. Watson, A. D. Schaile, A. A. Carter, Ron Folman, Roger Jones, J. Steuerer, S. Rossberg, C. J. Oram, R. J. Homer, J. Gascon, H. von der Schmitt, Gregor Herten, P. Schütz, N. K. Watson, J. A. McKenna, Eilam Gross, R. P. Middleton, B. Wilkens, R. Howard, C. Darling, T. J. Smith, J. P. Pansart, T. P. Kokott, C. Jui, A. Luig, M. G. Rison, K. Stephens, Claude Leroy, A. Gaidot, Siegfried Bethke, A. K. Honma, J. E. Pilcher, Stan Bentvelsen, Ehud Duchovni, R. D. Heuer, J. R. McNutt, W. Mohr, Fabrizio Fabbri, P. Mättig, Shoji Asai, D. Van den plas, Margret Fincke-Keeler, W. R. Gibson, A. Posthaus, B. Nijjhar, W. G. Scott, A. Astbury, J. M. Roney, M. Jimack, A. Beck, H. Ihssen, Marco Cuffiani, V. Gibson, E. Heflin, J. W. Gary, Lorne Levinson, U. Müller, P. D. Phillips, P. S. Wells, Gilles Beaudoin, Madjid Boutemeur, D. R. Ward, Terry Richard Wyatt, S. W. Gensler, S. J. Hillier, T. Kobayashi, Marcello Mannelli, J. E. Duboscq, M. Coupland, C. K. Hargrove, D. Hochman, P. G. Estabrooks, R. K. Keeler, P. Pfister, P. M. Watkins, M. J. Losty, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, J. Mildenberger, R. Lahmann, M. W. Redmond, D. C. Imrie, G. P. Siroli, J. King, B. Stockhausen, Paul Kyberd, Christoph Schwick, F. K. Loebinger, A. M. Rossi, H. M. Fischer, A. Michelini, S. A. Robins, R. Giacomelli, N. I. Geddes, B. Poli, Kiyotomo Kawagoe, P. Weber, and Gideon Bella
Subjects: Physics, Systematic error, Particle physics, Muon, Physics and Astronomy (miscellaneous), Model prediction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Standard Model, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract: The fraction of$Z^0 \to b\bar b$; events in hadronicZ0 decays has been measured using the data collected by OPAL in 1992 and 1993. The presence of electrons or muons from semileptonic decays of bottom hadrons and the detection of bottom hadron decay vertices were used together to obtain an event sample enriched in$Z^0 \to b\bar b$ decays. To reduce the systematic error on the measurement of the$Z^0 \to b\bar b$ fraction, the efficiency of the$b\bar b$ event tagging was obtained from the data by comparing the numbers of events having a bottom signature in either one or both thrust hemispheres. A value of $$\frac{{\Gamma (Z^0 \to b\bar b)}}{{\Gamma (Z^0 \to hadrons)}} = 0.2171 \pm 0.0021 \pm 0.0021$$ was obtained, where the first error is statistical and the second systematic. The uncertainty on the decay width$\Gamma (Z^0 \to c\bar c)$ is not included in these errors. A fractional variation of this width by ±8% about its Standard Model prediction would result in a variation of the measured$Z^0 \to b\bar b$ fraction of ±0.0015.
Published: 1995

9. Measurement of the hadronic decay current in τ−→π− − + v τ

Author: Michael Dittmar, G. Yekutieli, A. A. Carter, F. S. Merritt, Ron Folman, Roger Jones, T. J. Smith, P. Utzat, M. G. Rison, K. Stephens, A. I. McNab, P. Szymanski, J. A. McKenna, P. A. Elcombe, S. Braibant, R. Kowalewski, T. J. McMahon, J. Schwiening, J. Goldberg, R. K. Carnegie, J. A. Wilson, O. C. Cooke, G. W. Wilson, N. Capdevielle, J. von Krogh, Andris Skuja, Dave Robinson, M. Hauschild, L. A. del Pozo, C. Jui, Stan Bentvelsen, T. Hilse, R. Bartoldus, B. Nellen, P. Leblanc, K. Ametewee, Kiyotomo Kawagoe, Silvia Arcelli, C. Markus, Gideon Alexander, P. Igo-Kemenes, Gideon Bella, G. D. Long, P. E.L. Clarke, O. Runolfsson, R. Van Kooten, H. J. Burckhart, G. A. Snow, Jacqueline Batley, Paolo Capiluppi, H. Jeremie, N. J. Oldershaw, Matthias Schröder, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R.J. Akers, R. E. Hughes-Jones, U. Maur, Reda Tafirout, H. O. Ogren, Christoph Geich-Gimbel, B. C. Shen, F. Scharf, C. Beeston, C. P. Ward, D. L. Rees, V. Gibson, Sachio Komamiya, E. Lefebvre, A. S. Turcot, Claudio Grandi, U. C. Dunwoody, M. K. Jones, J. P. Martin, Theodoros Geralis, E. Ros, A. T. Watson, S. Söldner-Rembold, Tetsuro Mashimo, M. J. Oreglia, E. do Couto e Silva, O. Tousignant, O. Schaile, P. Weber, N. I. Geddes, M. Tscheulin, Siegfried Bethke, H. G. Evans, M. J. Goodrick, M. Yurko, Xinchou Lou, A. D. Schaile, P. W. Jeffreys, R. Giacomelli, A. K. Honma, B. Nijjhar, W. R. Gibson, W. G. Scott, N. L. Rodning, F. Odorici, F. X. Gentit, M. Starks, J. E. Conboy, S. De Jong, Paolo Giacomelli, I. Cohen, B. Poli, W. P. Lai, A. Fürtjes, V. H. Winterer, M. Hansroul, A. Beck, P. Bright-Thomas, G. Mikenberg, E. Heflin, S. W. O'Neale, D. M. Gingrich, Dave Charlton, D. R. Ward, R. M. Brown, J. M. Roney, Lorne Levinson, T. Kress, W. Gorn, J. J. Ward, P. Vikas, K. J. Anderson, W. Matthews, Shlomo Dado, C. H. Shepherd-Themistocleous, R. Bürgin, B. Fabbro, T. P. Kokott, Gilles Beaudoin, D. Rigby, R. J. Hemingway, A. M. Rossi, T. Tsukamoto, H. M. Fischer, J. R. Carter, A. Skillman, H. Przysiezniak, A. Luig, Madjid Boutemeur, Gregor Herten, M. A. Thomson, A. Michelini, R. J. Homer, P. Berlich, D. Axen, M. J. Losty, G. N. Patrick, J. C. Clayton, S. A. Robins, B. W. Kennedy, P. G. Estabrooks, R. K. Keeler, P. Jovanovic, B. Wilkens, E. K. U. Gross, A. Gaidot, D. R. Rust, A. Jawahery, P. S. Wells, Margret Fincke-Keeler, M. W. Redmond, P. O. Phillips, Hans-Christian Schultz-Coulon, Otmar Biebel, P. M. Watkins, J. E. Pilcher, S. G. Clowes, R. Lahmann, M. Fierro, Austin Ball, T. Wlodek, M. Sproston, J. E.G. Edwards, C. Y. Chang, D. C. Imrie, Randall Sobie, Michael Schulz, G. D. Lafferty, D. E. Plane, H. Mes, James Pinfold, U. Müller, G. P. Siroli, J. King, Peter Sherwood, John Allison, Christoph Schwick, Peter Krieger, I. P. Duerdoth, G. M. Dallavalle, D. G. Fong, D. Hochman, T. W. Pritchard, A. J. Martin, Alexander Wagner, Terry Richard Wyatt, P. Taras, N. Tesch, P. Fath, J. Gascon, D. L. Wagner, Guenter Duckeck, J. Hagemann, J. Ludwig, N. K. Watson, Michael Kobel, A. M. Lee, K. Runge, P. Bock, R. G. Kellogg, Manuella Vincter, J. W. Gary, R. W. Springer, Stefano Marcellini, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, Alessandro Montanari, Tohru Takeshita, C. K. Hargrove, J. G. Layter, H. Deng, P. Scharff-Hansen, P. A. Hart, W. Mohr, Georges Azuelos, Julie Kirk, Y. Routenburg, H. Lafoux, M. J. Pearce, Barry King, C. Dallapiccola, A. Buijs, C. Charlesworth, M. Fanti, A. M. Smith, K. W. Bell, A. Posthaus, D. M. Strom, C. Stegmann, G. A. Beck, Achim Stahl, G. Vasseur, B. Lorazo, P. Teixeira-Dias, J. D. Gillies, J. C. Hill, Misao Sasaki, H. Fukui, P. Poffenberger, T. Behnke, G. G. Hanson, A. Yeaman, B. Schmitt, G. Giacomelli, J. Letts, P. Schenk, R. J. Barlow, Peter Fischer, R. D. Heuer, D. J. Miller, M. S. Dixit, Frans Meijers, P. Schütz, P. Gagnon, Fabrizio Fabbri, R. Mir, Norbert Wermes, Sherry Towers, T. Kawamoto, J. Lauber, G. T. Zorn, T. G. Schears, H. Takeda, M. F. Turner-Watson, M. Morii, F. G. Oakham, H. M. Bosch, Wolfram Dietrich Zeuner, E. L. Barberio, Peter R Hobson, R. Howard, Claude Leroy, S. Orito, J. P. Pansart, M. Rosvick, Stephen Lloyd, M. Tecchio, Ehud Duchovni, M. Jimack, F. Palmonari, S. W. Gensler, S. J. Hillier, T. Kobayashi, C. Darling, P. Mättig, Shoji Asai, I. J. Bloodworth, M. Settles, Yoram Rozen, M. Foucher, Junichi Kanzaki, D. Karlen, C. Burgard, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, V. Zacek, J. Steuerer, Marco Cuffiani, S. L. Chu, Erez Etzion, Stefan Kluth, Shlomit Tarem, C. J. Oram, R. P. Middleton, Gunter Wolf, S. Wotton, and C. Sbarra
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Electron–positron annihilation, Hadron, Dalitz plot, Parity (physics), Elementary particle, Asymmetry, Nuclear physics, Amplitude, Neutrino, Engineering (miscellaneous), media_common
Abstract: The decay τ−→π−−+vτ has been studied using data collected with the OPAL detector at LEP during 1992 and 1993. The hadronic structure functions for this decay are measured model independently assuming G-parity invariance and neglecting scalar currents. Simultaneously the parity violating asymmetry parameter is determined to be$\gamma VA = 1.08 _{ - 0.41 - 0.25}^{ + 0.46 + 0.14} $, consistent with the Standard Model prediction of γVA=1 for left-handed tau neutrinos. Models of Kuhn and Santamaria and of Isgur et al. are used to fit distributions of the invariant 3π mass as well as 2π mass projections of the Dalitz plot. The model dependent mass and width of thea1 resonance are measured to be$m_{a_1 } = 1.266 \pm 0.014_{ - 0.002}^{ + 0.012} $ GeV and$\Gamma _{a_1 } = 0.610 \pm 0.049_{ - 0.019}^{ + 0.053} $ GeV for the Kuhn and Santamaria model and$m_{a_1 } = 1.202 \pm 0.009_{ - 0.001}^{ + 0.009} $ GeV and$\Gamma _{a_1 } = 0.422 \pm 0.023_{ - 0.004}^{ + 0.033} $ GeV for the Isgur et al. model. The model dependent values obtained for the parity violating asymmetry parameter are γVA=0.87±0.27−0.06+0.05 for the Kuhn and Santamaria model and γVA=1.10±0.31−0.14+0.13 for the Isgur et al. model. Within the Isgur et al. model the ratio of theS-andD-wave amplitudes is measured to beD/S=−0.09±0.03±0.01.
Published: 1995

10. Determination of event shape distributions and α s b from $$Z^0 \to b\bar b$$ events at LEP

Author: A. Yeaman, P. D. Grannis, T. J. Smith, Sachio Komamiya, Theodoros Geralis, E. Ros, Z. Li, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, Otmar Biebel, K. Stephens, B. C. Shen, T. P. Kokott, A. Luig, D. G. Charlton, D. L. Wagner, J. R. McNutt, A. Astbury, H. Mes, H. Deng, R. Humbert, Siegfried Bethke, N. K. Watson, U. Müller, A. K. Honma, J. Mildenberger, D. Rigby, R. J. Hemingway, I. P. Duerdoth, A. J. Martin, B. Nijjhar, W. G. Scott, J. M. Roney, Margret Fincke-Keeler, James Pinfold, C. Y. Chang, R. Lahmann, D. C. Imrie, J. E. Duboseq, G. Mikenberg, T. J. McMahon, B. W. Kennedy, M. Yurko, D. G. Fong, J. Gascon, H. von der Schmitt, P. Jovanovic, C. K. Hargrove, G. G. Hanson, F. Liu, G. Giacomelli, Gunter Wolf, F. X. Gentit, N. I. Geddes, M. W. Redmond, J. W. Gary, Michael Kobel, S. Braibant, Norbert Wermes, Sherry Towers, Austin Ball, P. W. Jeffreys, T. Kobayashi, G. P. Siroli, J. King, P. Igo-Kemenes, T. Kawamoto, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Peter Krieger, P. Schenk, M. J. Losty, J. Schwiening, P. A. Hart, Christoph Schwick, H. Lafoux, P. Bright-Thomas, D. A. Hinshaw, Manuella Vincter, Alessandro Montanari, R. K. Carnegie, M. J. Pearce, F. S. Merritt, E. Lefebvre, W. Mohr, G. A. Snow, C. P. Ward, H. Jeremie, S. Orito, D. R. Ward, P. Poffenberger, R. Giacomelli, M. Rosvick, A. Posthaus, J. A. Wilson, S. Wotton, B. Poli, M. S. Dixit, D. L. Rees, R. E. Hughes-Jones, U. Maur, F. Odorici, R. Mir, P. S. Wells, S. W. O'Neale, Frans Meijers, Matthias Schröder, J. J. Ward, Hans-Christian Schultz-Coulon, Gregor Herten, M. A. Thomson, Marcello Mannelli, R. W.L. Jones, P. Pfister, D. R. Rust, J. C. Clayton, H. M. Fischer, Kiyotomo Kawagoe, Andris Skuja, J. Lauber, A. Höcker, Tohru Takeshita, J. A. McKenna, A. Michelini, A. Skillman, V. Gibson, A. I. McNab, R. G. Kellogg, G. D. Long, B. Wilkens, Terry Richard Wyatt, A. T. Watson, J. Goldberg, C. Darling, D. S. Koetke, Georges Azuelos, J. G. Layter, K. J. Anderson, E. do Couto e Silva, Michael Schulz, M. J. Oreglia, E. K. U. Gross, Tetsuro Mashimo, Stefano Marcellini, J. Steuerer, H. Takeda, B. Nellen, Barry King, James Letts, S. A. Robins, Shlomo Dado, P. Leblanc, T. Wlodek, F. G. Oakham, M. Coupland, M. Sproston, E. L. Barberio, J. P. Pansart, T. Behnke, K. W. Bell, D. Axen, A. Jawahery, R. J. Barlow, C. Charlesworth, H. Przysiezniak, S. G. Clowes, J. Hart, C. Dallapiccola, J. C. Hill, G. N. Patrick, J. R. Carter, M. Fierro, P. Weber, H. G. Evans, N. Tesch, J. E. Pilcher, W. Gorn, J. D. Gillies, M. J. Goodrick, P. Mättig, I. Cohen, Peter Sherwood, Peter Fischer, Marco Cuffiani, J. von Krogh, T. Hilse, P. A. Elcombe, P. Schütz, Shoji Asai, R. W. Springer, Alexander Wagner, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, O. Runolfsson, A. M. Lee, A. Buijs, D. M. Strom, A. Gaidot, J. Hagemann, J. Ludwig, K. Runge, P. Bock, J. P. Martin, M. Sasaki, Erez Etzion, C. Stegmann, David Robinson, Stefan Kluth, J. Becker, S. L. Chu, P. Scharff-Hansen, A. M. Rossi, C. Beeston, C. M. Hawkes, T. W. Pritchard, S. De Jong, Daniel Lellouch, Shlomit Tarem, H. Fukui, Claudio Grandi, F. Scharf, C. Sbarra, T. Tsukamoto, S. Rossberg, C. J. Oram, Madjid Boutemeur, Takehiko Mori, P. Gagnon, A. D. Schaile, R. Bartoldus, Michael Dittmar, R. P. Middleton, D. J. Miller, J. Allison, R. Ströhmer, G. Yekutieli, A. M. Smith, P. G. Estabrooks, R. K. Keeler, M. Hauschild, G. Vasseur, D. Hochman, B. Lorazo, H. O. Ogren, Christoph Geich-Gimbel, G. T. Zorn, P. M. Watkins, C. Markus, H. M. Bosch, Wolfram Dietrich Zeuner, R. J. Sobie, Silvia Arcelli, R. Howard, Claude Leroy, I. J. Bloodworth, R. Van Kooten, G. D. Lafferty, Paolo Giacomelli, D. Pitman, Guenter Duckeck, S. L. Lloyd, M. H. Lehto, J. E. Conboy, R.J. Akers, M. Settles, M. Hansroul, A. Fürtjes, P. Le Du, B. Fabbro, T. G. Shears, C. H. Shepherd-Themistocleous, D. M. Gingrich, P. Szymanski, R. J. Homer, C. Moisan, Gideon Bella, G. A. Beck, Achim Stahl, P. Teixeira-Dias, M. Tecchio, P. Berlich, H. J. Burckhart, M. Fanti, B. Schmitt, Jacqueline Batley, O. Schaile, C. Jui, Stan Bentvelsen, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, R. Kowalewski, Xinchou Lou, V. H. Winterer, W. R. Gibson, A. Beck, E. Heflin, Gideon Alexander, R. M. Brown, Paolo Capiluppi, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, Ehud Duchovni, M. Jimack, H. Ihssen, S. W. Gensler, D. E. Plane, P. Bentkowski, S. J. Hillier, G. M. Dallavalle, Yoram Rozen, M. Foucher, G. W. Wilson, D. Karlen, C. Burgard, A. A. Carter, Ron Folman, and M. G. Rison
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Jet (particle physics), Vertex (geometry), Nuclear physics, High Energy Physics::Experiment, Parton shower, Engineering (miscellaneous), Event (probability theory)
Abstract: In hadronic Z0 decays collected by the OPAL experiment at LEP, event shape variables such as jet rates, jet masses, thrust and the energy-energy correlation for $$Z^0 \to b\bar b$$ events are compared to those for all flavours using secondary vertex information to tag the b quarks. The measured distributions are found to be well described by anO"(α s ) calculation for heavy quarks as well as by parton shower simulations. We also determine the ratio of the strong coupling constant for b quarks and all quarks, α b /α incl , from these distributions. We find $$\alpha _s^b /\alpha _s^{incl} = 0.994 \pm 0.005_{ - 0.012}^{ + 0.010} ,$$ where the errors are the statistical and systematic errors. The result can be converted into the ratio for b quarks relative to the complementary flavours udsc α b /α udsc =0.992±0.007 -0.015 +0.013 .
Published: 1995

11. Observations of ?-B charge-flavor correlations and resonant B? and BK production

Author: F. X. Gentit, Andris Skuja, S. Wotton, G. D. Long, A. Astbury, D. E. Plane, Tetsuro Mashimo, C. M. Hawkes, Daniel Lellouch, U. Müller, Erez Etzion, A. I. McNab, Stefan Kluth, J. Goldberg, Shlomit Tarem, J. Steuerer, C. J. Oram, B. Nellen, R. P. Middleton, J. G. Layter, Dave Charlton, P. Leblanc, C. Dallapiccola, G. M. Dallavalle, N. Capdevielle, H. G. Evans, W. Matthews, J. von Krogh, Eilam Gross, P. Igo-Kemenes, Takehiko Mori, M. J. Goodrick, I. Cohen, Kiyotomo Kawagoe, P. Poffenberger, J. D. Gillies, B. C. Shen, C. Charlesworth, V. Zacek, R. Bürgin, P. Le Du, B. Fabbro, W. Gorn, Peter Fischer, Madjid Boutemeur, G. Giacomelli, E. Lefebvre, F. S. Merritt, C. K. Hargrove, P. Schütz, H. Jeremie, A. Skillman, M. J. Oreglia, Dave Robinson, L. A. del Pozo, A. S. Turcot, Z. Li, R. J. Barlow, D. J. Miller, Paolo Giacomelli, M. Hansroul, P. E.L. Clarke, F. Odorici, P. Weber, U. C. Dunwoody, M. K. Jones, Gideon Bella, J. P. Martin, H. J. Burckhart, Jacqueline Batley, P. Scharff-Hansen, T. Wlodek, R. E. Hughes-Jones, U. Maur, A. Gaidot, M. Sproston, D. R. Rust, P. S. Wells, Terry Richard Wyatt, C. Sbarra, G. W. Wilson, M. Hauschild, A. Höcker, M. F. Turner-Watson, M. Morii, C. H. Shepherd-Themistocleous, Marco Cuffiani, Peter R Hobson, V. H. Winterer, Siegfried Bethke, R. Kowalewski, K. Ametewee, Gideon Alexander, M. Tscheulin, R. Mir, Paolo Capiluppi, C. Markus, Michael Dittmar, E. do Couto e Silva, G. Yekutieli, P. G. Estabrooks, R. K. Keeler, R. J. Homer, Reda Tafirout, J. R. Carter, M. Sasaki, S. De Jong, J. C. Clayton, C. Darling, P. A. Hart, N. I. Geddes, Shlomo Dado, A. M. Smith, Xinchou Lou, G. N. Patrick, J. A. McKenna, J. Lauber, A. K. Honma, B. Nijjhar, W. G. Scott, Otmar Biebel, A. M. Lee, A. A. Carter, P. Routenburg, Sachio Komamiya, S. L. Chu, M. J. Pearce, P. Mättig, T. Tsukamoto, N. Tesch, T. Behnke, Shoji Asai, G. Vasseur, C. Y. Chang, B. Lorazo, Ron Folman, Roger Jones, H. Takeda, Theodoros Geralis, P. Taras, Ehud Duchovni, N. L. Rodning, D. L. Wagner, H. M. Bock, E. Ros, A. T. Watson, I. J. Bloodworth, W. R. Gibson, B. Poli, Michael Kobel, F. G. Oakham, P. Utzat, M. Jimack, G. A. Beck, R. Howard, Achim Stahl, M. G. Rison, P. Teixeira-Dias, Giora Mikenberg, H. Deng, R. Bartoldus, P. A. Elcombe, M. Settles, M. J. Losty, James Pinfold, D. Axen, E. L. Barberio, Claude Leroy, Julie Kirk, H. Lafoux, S. W. Gensler, A. Beck, T. P. Kokott, A. Luig, P. M. Watkins, H. O. Ogren, S. Braibant, H. Mes, Yoram Rozen, I. P. Duerdoth, E. Heflin, A. Jawahery, M. Foucher, D. G. Fong, Matthias Schröder, Christoph Geich-Gimbel, D. Rigby, R. J. Hemingway, T. J. McMahon, S. J. Hillier, T. Kobayashi, Lorne Levinson, R. Van Kooten, B. Schmitt, P. Szymanski, J. Gascon, D. Pitman, P. D. Phillips, G. A. Snow, C. P. Ward, D. L. Rees, P. Fath, S. Söldner-Rembold, Norbert Wermes, Peter Sherwood, Sherry Towers, O. Tousignant, B. W. Kennedy, J. Schwiening, R. K. Carnegie, T. Kawamoto, Gilles Beaudoin, Junichi Kanzaki, R. W. Springer, D. Karlen, C. Burgard, Alexander Wagner, J. W. Gary, R. Lahmann, J. Hagemann, J. Ludwig, P. Jovanovic, M. W. Redmond, Austin Ball, Peter Krieger, Margret Fincke-Keeler, D. C. Imrie, S. W. O'Neale, K. J. Anderson, J. A. Wilson, Gregor Herten, G. G. Hanson, D. S. Koetke, K. Runge, P. Bock, Tohru Takeshita, Marcello Mannelli, J. E. Duboscq, Manuella Vincter, Alessandro Montanari, T. G. Shears, F. Scharf, F. Liu, P. Gagnon, J. E. Conboy, G. P. Siroli, J. King, A. Fürtjes, C. Jui, B. Wilkens, Georges Azuelos, Christoph Schwick, A. Buijs, D. M. Strom, Stan Bentvelsen, A. D. Schaile, C. Stegmann, D. M. Gingrich, P. Schenk, Barry King, A. M. Rossi, Stephen Lloyd, John Allison, A. Yeaman, J. P. Pansart, H. M. Fischer, H. Fukui, M. S. Dixit, G. T. Zorn, Frans Meijers, M. Tecchio, Robert M Brown, K. W. Bell, N. K. Watson, A. Michelini, J. C. Hill, P. Berlich, Silvia Arcelli, J. E. Pilcher, M. Fanti, Wolfram Dietrich Zeuner, S. A. Robins, Hans-Christian Schultz-Coulon, H. Przysiezniak, S. G. Clowes, R.J. Akers, Randall Sobie, Michael Schulz, G. D. Lafferty, W. Mohr, M. Fierro, A. Posthaus, R. G. Kellogg, O. Schaile, R. D. Heuer, T. W. Pritchard, Fabrizio Fabbri, M. Starks, A. J. Martin, Stefano Marcellini, T. Hilse, James Letts, Guenter Duckeck, O. Runolfsson, C. Beeston, W. P. Lai, Claudio Grandi, B. Stockhausen, Paul Kyberd, F. K. Loebinger, M. Yurko, P. W. Jeffreys, J. M. Roney, T. J. Smith, P. Bright-Thomas, K. Stephens, R. Giacomelli, J. J. Ward, P. Vikas, M. A. Thomson, V. Gibson, D. R. Ward, T. Kress, D. Hochman, S. Orito, M. Rosvick, and Gunter Wolf
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Nuclear physics, Pion, High Energy Physics::Experiment, Invariant mass, B meson, Engineering (miscellaneous), Particle Physics - Experiment, Lepton
Abstract: Evidence is presented for kinematic and charge correlations of B mesons with charged pions and kaons. Using a new technique, a sample of over 80 000 partially reconstructed B mesons is obtained in 3.5·106 hadronic Z0 decays recorded using the OPAL detector at LEP. The invariant mass distributions of B+π− and B+K− combinations show enhancements consistent with the decays of P-wave resonances of a b antiquark and a light quark. We observe an excess of 1738±195 B+π− pairs with invariant masses in the range 5.60-5.85 GeV and an excess of 149±31 B+K− pairs with invariant masses in the range 5.80–6.00 GeV. Labeling the observed enhancements generically as B** we find $$\begin{gathered} \frac{{BR(Z^0 \to \bar b \to B^{**0} \to B^{(*) + } \pi ^ - )}}{{BR(Z^0 \to \bar b \to B^ + )}} = 0.18 \pm 0.04, \hfill \\ \frac{{BR(Z^0 \to \bar b \to B_s^{**0} \to B^{(*) + } K^ - )}}{{BR(Z^0 \to \bar b \to B^ + )}} = 0.026 \pm 0.008, \hfill \\ \end{gathered} $$ where B(*)+ indicates the sum of B+ and B*+ and the errors include statistical and systematic contributions. From a study of π-B charge-flavor correlations we conclude that the production flavor of a B meson can be tagged with the charge of a pion in an appropriately chosen kinematic region, and that the performance of this flavor tag compares favorably in the$Z^0 \to q\bar q$ environment with lepton-based tags.
Published: 1995

12. Measurement of $$\Gamma (Z^0 \to b\bar b)/\Gamma (Z^0 \to hadrons)$$ using impact parameters and leptons

Author: R. Lahmann, D. C. Imrie, J. C. Clayton, B. C. Shen, G. P. Siroli, J. King, A. K. Honma, Christoph Schwick, W. G. Scott, Gideon Bella, H. J. Burckhart, M. Jones, Jacqueline Batley, G. A. Snow, C. P. Ward, M. J. Pearce, Horst Breuker, Margret Fincke-Keeler, D. L. Rees, M. J. Losty, Otmar Biebel, P. Igo-Kemenes, C. Jui, J. Hart, C. Sbarra, S. Barnett, Claude Leroy, A. Astbury, J. P. Pansart, J. D. Gillies, P. Pfister, R. Bartoldus, H. Jeremie, U. Müller, James Pinfold, G. E. Richards, D. Pitman, A. J. Martin, F. C. Grant, M. H. Lehto, D. G. Charlton, D. L. Wagner, R. J. Barlow, R. E. Hughes-Jones, U. Maur, D. Hochman, D. G. Fong, H. O. Ogren, Michael Dittmar, G. Yekutieli, D. J. Miller, Christoph Geich-Gimbel, G. Beaudoin, C. K. Hargrove, N. I. Geddes, Matthias Schröder, H. Lafoux, N. Paz-Jaoshvili, J. Steuerer, J. Gascon, H. von der Schmitt, T. G. Shears, B. Boden, K. Stephens, J. R. McNutt, R.J. Akers, J. Lauber, E. do Couto e Silva, A. Buijs, D. M. Strom, C. Stegmann, H. Takeda, D. M. Gingrich, D. E. Plane, P. Bentkowski, A. A. Carter, Roger Jones, R. Van Kooten, M. G. Rison, T. J. McMahon, B. Poli, F. G. Oakham, G. M. Dallavalle, M. Hansroul, Madjid Boutemeur, E. Lefebvre, J. W. Gary, Marcello Mannelli, J. E. Duboscq, H. Deng, R. Humbert, Shlomo Dado, Tohru Takeshita, J. Schwiening, R. K. Carnegie, F. X. Gentit, B. Fabbro, O. Schaile, P. Berlich, J. A. Wilson, F. Odorici, J. E. Conboy, B. Panzer-Steindel, R. Kowalewski, R. Yaari, D. J.P. Dumas, R. J. Hemingway, Georges Azuelos, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, V. Gibson, S. Bethke, P. Scharff-Hansen, G. Quast, J. M. Lorah, W. Schappert, P. Kroll, Marco Cuffiani, John Baines, X. C. Lou, Silvia Arcelli, W. R. Gibson, A. M. Rossi, C. H. Shepherd-Themistocleous, P. Jovanovic, T. Tsukamoto, W. Mohr, J. F. Kral, Austin Ball, H. M. Fischer, M. A. Whallev, K. W. Bell, Max Weber, D. Menszner, Randall Sobie, G. D. Lafferty, S. L. Chu, A. Beck, J. C. Hill, A. Michelini, H. Mes, Norbert Wermes, J. von Krogh, I. P. Duerdoth, A. C. Janissen, J. M. Roney, E. Heflin, Sherry Towers, P. S. Wells, Misao Sasaki, R. J. Homer, M. Hauschild, Alessandro Montanari, R. M. Brown, T. Kawamoto, A. M. Smith, P. M. Hattersley, J. Banks, Lorne Levinson, G. Vasseur, Dave Robinson, Gideon Alexander, P. A. Elcombe, Giora Mikenberg, C. Markus, P. Paschievici, Terry Richard Wyatt, B. Lorazo, D. R. Ward, L. A. del Pozo, C. Y. Chang, M. F. Turner, B. W. Kennedy, T. W. Pritchard, E. Torrente-Lujan, G. Transtromer, Paolo Capiluppi, Kiyotomo Kawagoe, John Hobbs, C. Moisan, R. D. Heuer, M. Coupland, Andris Skuja, G. A. Beck, Fabrizio Fabbri, Achim Stahl, S. Orito, M. Rosvick, J. Becker, P. Teixeira-Dias, D. Van den plas, P. Weber, F. S. Merritt, F. Scharf, Tetsuro Mashimo, G. J. VanDalen, R. Mir, Gregor Herten, D. R. Rust, C. Wahl, B. Schmitt, B. Wilkens, A. Skillman, A. M. Lee, J. E. Pilcher, W. Gorn, A. Gaidot, T. Wlodek, M. Sproston, G. Giacomelli, J. A. McKenna, M. J. Oreglia, N. Tesch, A. Dieckmann, A. D. Schaile, V. H. Winterer, P. Schenk, J. R. Carter, P. F. Harrison, G. N. Patrick, Stephen Lloyd, M. Tecchio, M. S. Dixit, Ehud Duchovni, M. Jimack, H. Ihssen, Frans Meijers, S. W. Gensler, S. J. Hillier, T. Kobayashi, P. E.L. Clarke, H. Przysiezniak, M. Fierro, M. Yurko, S. A. Robins, J. P. Martin, P. W. Jeffreys, S. De Jong, P. Bright-Thomas, S. W. O'Neale, M. A. Thomson, K. J. Anderson, J. G. Layter, T. Hilse, O. Runolfsson, P. Poffenberger, C. Beeston, Claudio Grandi, D. A. Hinshaw, T. Behnke, D. Axen, A. Jawahery, Peter Sherwood, I. J. Bloodworth, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, G. Duckeck, R. Ströhmer, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, A. Yeaman, M. Settles, M. Foucher, N. K. Watson, G. W. Wilson, D. Karlen, C. Burgard, C. M. Hawkes, M. Cooper, Erez Etzion, Daniel Lellouch, Takehiko Mori, Stefan Kluth, Shlomit Tarem, S. Rossberg, C. J. Oram, R. P. Middleton, J. Goldberg, B. Nellen, P. Leblanc, M. Morii, T. J. Smith, Peter R Hobson, H. G. Evans, M. J. Goodrick, I. Cohen, P. Routenburg, Gunter Wolf, P. Mättig, Sachio Komamiya, N. J. Tesilian, E. Ros, A. T. Watson, S. Wotton, T. P. Kokott, A. Luig, Paul Kyberd, F. K. Loebinger, A. Rollnik, R. Giacomelli, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, M. W. Redmond, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, and James Letts
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Elementary particle, Bottom quark, Charm quark, Nuclear physics, High Energy Physics::Experiment, Production (computer science), Impact parameter, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract: A measurement of$\Gamma _{b\bar b} /\Gamma _{had} \equiv \Gamma (Z^0 \to b\bar b)/\Gamma (Z^0 \to hadrons)$ is presented using a “mixed tag” method involving the identification of$Z^0 \to b\bar b$ events by two different techniques. The first uses the large impact parameter of tracks emerging from the decay ofb-flavoured hadrons and the second their semi-leptonic decay. The identification efficiencies are measured from the data using all possible combinations of the two tags in opposite hemispheres. The method is therefore insensitive to Monte Carlo modelling of bottom quark production and ofb-flavoured hadron production and decay properties, and depends only weakly on the simulation of the detector. The data sample collected by OPAL at LEP in 1990 and 1991 is considered. The result is: $$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }} = 0.218 \pm 0.006(stat) \pm 0.007(syst) \pm 0.007(\Gamma _{c\bar c} /\Gamma _{had} ),$$ where the systematic uncertainty due to the charm quark partial width has been separated from the other systematic uncertainties. Combination with previous OPAL measurements gives: $$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }} = 0.220 \pm 0.004(stat) \pm 0.006(syst) \pm 0.006(\Gamma _{c\bar c} /\Gamma _{had} ),$$
Published: 1994

13. A study of mean sub-jet multiplicities in two- and three-jet hadronicZ 0 decays

Author: U. Müller, A. J. Martin, B. C. Shen, Siegfried Bethke, A. K. Honma, W. G. Scott, J. W. Gary, P. E.L. Clarke, M. K. Jones, P. Scharff-Hansen, C. K. Hargrove, Gideon Bella, T. J. McMahon, J. P. Martin, H. J. Burckhart, Jacqueline Batley, S. De Jong, M. J. Losty, Shlomo Dado, J. Schwiening, R. K. Carnegie, H. M. Fischer, M. Yurko, J. A. Wilson, Sachio Komamiya, A. Michelini, P. W. Jeffreys, T. Kobayashi, H. Mes, Theodoros Geralis, E. Ros, I. P. Duerdoth, A. M. Smith, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, Matthias Schröder, G. Vasseur, B. Lorazo, Xinchou Lou, I. J. Bloodworth, P. Bright-Thomas, S. A. Robins, R. Bartoldus, P. A. Hart, H. Deng, T. P. Kokott, G. Mikenberg, C. Sbarra, R. Humbert, A. Luig, Madjid Boutemeur, M. J. Pearce, C. Moisan, J. Steuerer, G. A. Beck, James Pinfold, R. Kowalewski, H. O. Ogren, Christoph Geich-Gimbel, Michael Dittmar, J. G. Layter, J. J. Ward, M. A. Thomson, R. J. Hemingway, G. Yekutieli, Achim Stahl, J. R. Carter, P. Teixeira-Dias, D. G. Fong, J. Gascon, H. von der Schmitt, Norbert Wermes, Sherry Towers, C. Charlesworth, A. A. Carter, Ron Folman, J. Goldberg, P. G. Estabrooks, M. Settles, R. K. Keeler, P. Igo-Kemenes, T. Kawamoto, P. Jovanovic, B. Nellen, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, B. Schmitt, Georges Azuelos, Gideon Alexander, T. Behnke, Andris Skuja, Hans-Christian Schultz-Coulon, Austin Ball, J. Kroll, Michael Schulz, Z. Li, Paolo Capiluppi, E. Lefebvre, S. L. Lloyd, H. Jeremie, G. A. Snow, C. P. Ward, S. Orito, M. Rosvick, D. L. Rees, M. G. Rison, P. Leblanc, R. E. Hughes-Jones, U. Maur, F. X. Gentit, G. D. Long, P. Schütz, Margret Fincke-Keeler, Tetsuro Mashimo, J. E. Conboy, A. Fürtjes, R. Mir, Manuella Vincter, Alessandro Montanari, K. W. Bell, R. Yaari, Marco Cuffiani, F. Odorici, G. G. Hanson, M. Morii, Peter R Hobson, T. Hilse, V. Gibson, M. Sasaki, J. C. Hill, T. W. Pritchard, B. Boden, J. Allison, R. Ströhmer, B. Poli, M. J. Oreglia, G. Giacomelli, P. Routenburg, W. Gorn, P. F. Harrison, E. do Couto e Silva, M. Tecchio, F. S. Merritt, J. A. McKenna, D. E. Plane, P. Pfister, J. Hart, C. Dallapiccola, M. Foucher, Guenter Duckeck, S. L. Chu, R. G. Kellogg, A. D. Schaile, P. Schenk, J. D. Gillies, Silvia Arcelli, O. Runolfsson, C. Y. Chang, M. F. Turner, S. Barnett, D. S. Koetke, G. T. Zorn, Stefano Marcellini, H. G. Evans, M. S. Dixit, J. von Krogh, Frans Meijers, G. W. Wilson, M. J. Goodrick, D. Karlen, Ehud Duchovni, G. N. Patrick, Michael Kobel, P. Le Du, B. Fabbro, H. M. Bosch, P. Bentkowski, D. J. Miller, Wolfram Dietrich Zeuner, I. Cohen, M. Jimack, James Letts, C. Burgard, H. Ihssen, C. Beeston, S. W. Gensler, D. Hochman, S. J. Hillier, H. Lafoux, Paolo Giacomelli, M. Hansroul, C. M. Hawkes, Claudio Grandi, M. Cooper, C. Jui, Daniel Lellouch, D. Axen, G. M. Dallavalle, J. Lauber, C. H. Shepherd-Themistocleous, Takehiko Mori, S. W. O'Neale, L. A. del Pozo, A. Jawahery, R. J. Homer, P. M. Watkins, Paul Kyberd, H. Takeda, F. G. Oakham, Peter Sherwood, Erez Etzion, F. K. Loebinger, J. C. Clayton, K. J. Anderson, A. M. Rossi, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, T. Tsukamoto, G. J. Van Dalen, K. Runge, P. Bock, V. H. Winterer, G. D. Lafferty, David Robinson, A. Yeaman, Stefan Kluth, C. Darling, Shlomit Tarem, P. Mättig, Shoji Asai, D. A. Hinshaw, R. J. Barlow, H. Przysiezniak, M. Fierro, A. Rollnik, P. Poffenberger, S. Rossberg, C. J. Oram, R. Giacomelli, T. J. Smith, K. Stephens, J. R. McNutt, R. P. Middleton, D. J.P. Dumas, G. Quast, Gunter Wolf, J. Mildenberger, Harold Nguyen, D. R. Ward, N. I. Geddes, W. R. Gibson, M. W. Redmond, M. Hauschild, S. Wotton, C. Markus, P. Paschievici, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, Gilles Beaudoin, E. Torrente-Lujan, Gregor Herten, C. Wahl, B. Wilkens, Kiyotomo Kawagoe, P. Weber, J. E. Pilcher, R. Lahmann, D. C. Imrie, R.J. Akers, G. P. Siroli, J. King, Christoph Schwick, A. Skillman, P. M. Hattersley, A. Gaidot, T. Wlodek, M. Sproston, F. C. Grant, N. Tesch, N. K. Watson, A. Buijs, D. M. Strom, C. Stegmann, J. M. Roney, H. Fukui, W. Mohr, P. A. Elcombe, R. J. Sobie, J. Becker, R. Howard, F. Scharf, Claude Leroy, J. P. Pansart, P. S. Wells, Terry Richard Wyatt, A. T. Watson, M. Coupland, R. Van Kooten, D. Pitman, M. H. Lehto, T. G. Shears, D. M. Gingrich, P. Berlich, D. R. Rust, A. M. Lee, O. Schaile, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, and A. Astbury
Subjects: Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Monte Carlo method, Hadron, Perturbative QCD, Multiplicity (mathematics), Gluon, Nuclear physics, High Energy Physics::Experiment, Parton shower, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: This paper describes an analysis of sub-jet multiplicities, which are expected to be sensitive to the properties of soft gluon radiation, in hadronic decays of theZ0. Two- and three-jet event samples are selected using thek⊥ jet clustering algorithm at a jet resolution scaley1. The mean sub-jet multiplicity as a function of the sub-jet resolution,y0, is determined separately for both event samples by reapplying the same jet algorithm at resolution scalesy0
Published: 1994

14. Measurement of the photon structure functionF 2 ? in the reactione + e ??e + e ?+hadrons at LEP

Author: James Pinfold, D. G. Fong, J. Gascon, H. von der Schmitt, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, Matthias Schröder, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, Andris Skuja, Tetsuro Mashimo, W. Gorn, H. Deng, R. Humbert, M. Yurko, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, Kiyotomo Kawagoe, J. Steuerer, Erez Etzion, H. Lafoux, N. Paz-Jaoshvili, Norbert Wermes, Sherry Towers, Silvia Arcelli, I. J. Bloodworth, M. Settles, S. A. Robins, P. W. Jeffreys, T. Kobayashi, Gideon Bella, Stefan Kluth, P. Igo-Kemenes, M. Foucher, H. J. Burckhart, P. Bright-Thomas, T. Kawamoto, C. Y. Chang, M. F. Turner, Gregor Herten, C. Wahl, B. Wilkens, D. A. Hinshaw, Jacqueline Batley, Tohru Takeshita, J. G. Layter, G. W. Wilson, D. Karlen, C. Burgard, H. Jeremie, O. Schaile, Shlomit Tarem, J. J. Ward, G. J. VanDalen, J. C. Clayton, M. A. Thomson, M. Hansroul, P. Weber, S. Rossberg, C. J. Oram, R. E. Hughes-Jones, U. Maur, J. Mildenberger, Harold Nguyen, Georges Azuelos, J. E. Pilcher, Shlomo Dado, T. Behnke, V. Gibson, J. F. Kral, K. W. Bell, N. I. Geddes, C. H. Shepherd-Themistocleous, R. P. Middleton, M. J. Pearce, Horst Breuker, Max Weber, M. W. Redmond, J. C. Hill, R. J. Homer, X. C. Lou, R. J. Barlow, R. Yaari, P. E.L. Clarke, M. Hauschild, B. C. Shen, P. S. Wells, E. do Couto e Silva, T. W. Pritchard, J. Goldberg, H. Przysiezniak, M. Fierro, J. Banks, S. Bethke, A. K. Honma, W. G. Scott, W. R. Gibson, E. Lefebvre, Marco Cuffiani, J. P. Martin, C. Moisan, B. Nellen, J. W. Gary, F. Odorici, N. J. Tresilian, Terry Richard Wyatt, G. A. Beck, A. T. Watson, P. Mättig, C. Markus, R. G. Kellogg, A. Astbury, Achim Stahl, P. Paschievici, P. Leblanc, S. De Jong, P. Teixeira-Dias, D. S. Koetke, R. D. Heuer, Stefano Marcellini, U. Müller, C. M. Hawkes, M. Coupland, M. Cooper, J. A. McKenna, M. J. Losty, James Letts, Fabrizio Fabbri, D. Van den plas, B. Fabbro, A. J. Martin, Daniel Lellouch, S. L. Chu, T. Hilse, B. Panzer-Steindel, H. Mes, Paul Kyberd, F. K. Loebinger, Takehiko Mori, A. Beck, H. G. Evans, I. P. Duerdoth, J. Allison, D. Pitman, M. J. Goodrick, G. D. Lafferty, P. F. Harrison, I. Cohen, M. H. Lehto, G. Duckeck, R. Ströhmer, B. Schmitt, E. Heflin, C. Jui, O. Runolfsson, M. Jones, A. Rollnik, P. Poffenberger, R. Giacomelli, C. K. Hargrove, G. Mikenberg, Madjid Boutemeur, Gunter Wolf, R. M. Brown, G. A. Snow, C. P. Ward, P. M. Hattersley, T. G. Shears, T. J. Smith, R. J. Sobie, D. L. Rees, Lorne Levinson, P. G. Estabrooks, R. K. Keeler, K. Stephens, D. M. Gingrich, A. M. Rossi, C. Beeston, Margret Fincke-Keeler, R.J. Akers, Claudio Grandi, J. R. McNutt, John Hobbs, B. W. Kennedy, Gilles Beaudoin, M. Tecchio, S. Wotton, E. Torrente-Lujan, P. Berlich, G. T. Zorn, P. M. Watkins, V. H. Winterer, Claude Leroy, J. P. Pansart, T. Tsukamoto, R. Lahmann, D. R. Rust, F. C. Grant, D. C. Imrie, Ehud Duchovni, M. A. Whalley, D. E. Plane, M. Sasaki, P. Bentkowski, G. M. Dallavalle, A. M. Lee, M. Jimack, A. Buijs, G. Quast, John Baines, D. M. Strom, C. Stegmann, H. Ihssen, D. J.P. Dumas, P. Pfister, S. W. Gensler, S. J. Hillier, B. Boden, H. M. Bosch, Wolfram Dietrich Zeuner, B. Poli, D. R. Ward, G. Transtromer, G. P. Siroli, J. King, H. M. Fischer, A. Michelini, R. Kowalewski, A. C. Janissen, S. W. O'Neale, S. Barnett, Christoph Schwick, Gideon Alexander, D. Hochman, Paolo Capiluppi, J. R. Carter, D. Axen, K. J. Anderson, A. Jawahery, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, S. Orito, M. Rosvick, M. Morii, Peter R Hobson, R. Mir, P. Routenburg, M. J. Oreglia, F. S. Merritt, J. von Krogh, Dave Robinson, G. N. Patrick, L. A. del Pozo, C. Sbarra, R. Bartoldus, Michael Dittmar, G. Yekutieli, H. O. Ogren, A. Yeaman, Christoph Geich-Gimbel, A. A. Carter, J. Kroll, R. Van Kooten, S. L. Lloyd, N. K. Watson, F. X. Gentit, J. E. Conboy, Sachio Komamiya, M. G. Rison, T. J. McMahon, J. Schwiening, E. Ros, R. K. Carnegie, J. A. Wilson, T. P. Kokott, A. Luig, W. Schappert, J. M. Roney, J. M. Lorah, J. Lauber, W. Mohr, H. Takeda, F. G. Oakham, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, J. Hart, J. D. Gillies, D. J. Miller, P. A. Elcombe, J. Becker, F. Scharf, A. Skillman, A. Gaidot, T. Wlodek, M. Sproston, N. Tesch, A. Dieckmann, G. G. Hanson, G. Giacomelli, A. D. Schaile, P. Schenk, M. S. Dixit, and Frans Meijers
Subjects: Quantum chromodynamics, Quark, Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hadron, Perturbative QCD, Vector meson dominance, Elementary particle, Photon structure function, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract: We present measurements of the hadronic photon structure functionF2γ(x), in twoQ2 ranges with mean values of 5.9 GeV2 and 14.7 GeV2. The data were taken by the OPAL experiment at LEP, with$\sqrt s$ close to theZ0 mass and correspond to an integratede+e− luminosity of 44.8 pb−1. In the context of a QCD-based model we find the quark transverse momentum cutoff separating the vector meson dominance (VMD) and perturbative QCD regions to be 0.27±0.10 GeV. We confirm that there is a significant pointlike component of the photon when the probe photon hasQ2>4 GeV2. Our measurements extend to lower values ofx than any previous experiment, and no increase ofF2γ(x) is observed.
Published: 1994

15. Multiplicity and transverse momentum correlations in multihadronic final states in e+e− interactions at √s = 91.2 GeV

Author: J. W. Gary, H. O. Ogren, Sachio Komamiya, Christoph Geich-Gimbel, Theodoros Geralis, Carla Sbarra, I. J. Bloodworth, G. Quast, T. P. Kokott, A. Luig, S. L. Lloyd, F. X. Gentit, T. R. Wyatt, M. Settles, J. E. Conboy, M. Tecchio, R. J. Barlow, G. Mikenberg, B. C. Shen, M. Foucher, S. L. Chu, J. D. Gillies, M. Jimack, Siegfried Bethke, M. Hauschild, W. G. Scott, P. Weber, C. Jui, Tohru Takeshita, Georges Azuelos, M. Fierro, C. M. Hawkes, K. W. Bell, Norbert Wermes, J. C. Hill, S. A. Wotton, A. H. Ball, Silvia Arcelli, G. W. Wilson, M. J. Losty, J. Pinfold, C. Schwick, C. Markus, M. Jones, P. Paschievici, J.A. Lauber, D. G. Fong, G. A. Snow, C. P. Ward, J. M. Roney, J. Gascon, J. Goldberg, A. Skillman, D. J. Miller, Kiyotomo Kawagoe, P. Igo-Kemenes, Paul Fraser Harrison, B. Boden, D. L. Rees, G. Duckeck, A. D. Schaile, P. S. Wells, J. Schwiening, B. Nellen, B. Poli, Z. Li, R. G. Kellogg, Daniel Lellouch, P. Leblanc, H. Jeremie, A. Gaidot, D. S. Koetke, F. S. Merritt, Takehiko Mori, A. T. Watson, R. E. Hughes-Jones, U. Maur, T. Hilse, V. H. Winterer, T. Wlodek, M. J. Cooper, M. Sproston, R.J. Akers, W. R. Gibson, V. Gibson, Marcello Mannelli, J. E. Duboscq, D. Axen, H. G. Evans, Stefano Marcellini, M. Morii, N. Tesch, A. Dieckmann, Peter R Hobson, James Letts, A. Jawahery, N. K. Watson, M. J. Goodrick, I. Cohen, J. A. McKenna, Andris Skuja, E. do Couto e Silva, R. J. Hemingway, Shlomo Dado, A. M. Lee, G. D. Lafferty, Tetsuro Mashimo, R. Kowalewski, Claudio Grandi, D. Pitman, D.L. Wagner, M. Yurko, A. Beck, Michael Schulz, P. Jovanovic, P. W. Jeffreys, J. M. Lorah, Madjid Boutemeur, C. Darling, X. C. Lou, E. Heflin, Matthias Schröder, T. Kobayashi, R. Yaari, P. E. L. Clarke, Robert Lahmann, R. W. Springer, W. Mohr, A. M. Rossi, Richard Keeler, R. M. Brown, P. Mättig, J. Mildenberger, Harold Nguyen, Marco Cuffiani, P. G. Estabrooks, C. J. Oram, T. W. Pritchard, W. Gorn, Gideon Alexander, Paolo Capiluppi, Gordon H. Hanson, Alessandro Montanari, T. Tsukamoto, D. C. Imrie, Lorne Levinson, H. von der Schmitt, A. Yeaman, N. I. Geddes, J. Ludwig, K. Runge, P. Bock, P. A. Elcombe, Erez Etzion, Ehud Duchovni, R. Mir, H. M. Fischer, B. W. Kennedy, P. M. Watkins, H. Lafoux, J. J. Ward, David Robinson, M. A. Thomson, Stefan Kluth, Shlomit Tarem, A. Michelini, A. Wagner, J. Hagemann, A. C. Janissen, H. Ihssen, M. Rosvick, P. Scharff-Hansen, F. K. Loebinger, A. Astbury, S. Rossberg, Gilles Beaudoin, E. Torrente-Lujan, N. Paz-Jaoshvili, Gregor Herten, S. A. Robins, S. W. Gensler, R. P. Middleton, F. Scharf, C. Wahl, M. W. Redmond, D. M. Gingrich, S. J. Hillier, H. Mes, G. P. Siroli, J. King, Peter Sherwood, D. A. Hinshaw, A. M. Smith, A. Rollnik, R. Giacomelli, B. Wilkens, J. R. Carter, G. Vasseur, B. Lorazo, Pedro Teixeira-Dias, J. Kroll, H. Takeda, M. Fincke-Keeler, R. D. Heuer, F. G. Oakham, J. Allison, P. Routenburg, G. T. Zorn, P. Kyberd, H. M. Bosch, J. E. Pilcher, Wolfram Dietrich Zeuner, P.A. Hart, Eduardo Ros, John Hart, U. Müller, R. Sobie, A. J. Martin, P. M. Hattersley, T. Behnke, C. K. Hargrove, D. E. Plane, P. Poffenberger, M. J. Pearce, P. Bentkowski, G. M. Dallavalle, O. Runolfsson, D. J.P. Dumas, T. J. McMahon, R. K. Carnegie, J. A. Wilson, W. Schappert, J. G. Layter, Michael Dittmar, G. Yekutieli, A. A. Carter, S. J. De Jong, M. G. Rison, M. F. Turner, S. Barnett, D. Hochman, J. von Krogh, K. Stephens, J. R. McNutt, L. A. del Pozo, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, D. R. Ward, G. Transtromer, G. J. VanDalen, J. C. Clayton, M. Coupland, J.P. Martin, H. Przysiezniak, Otmar Biebel, G. E. Richards, D. G. Charlton, J. K. Becker, H. Deng, R. Humbert, Paolo Giacomelli, M. Hansroul, C. H. Shepherd-Themistocleous, R. J. Homer, C. Moisan, G. A. Beck, Sherry Towers, T. Kawamoto, B. Schmitt, H-C. Schultz-Coulon, A. Stahl, R. W. L. Jones, P. Pfister, S. Orito, P. Le Du, B. Fabbro, Gideon Bella, H. J. Burckhart, Jacqueline Batley, M. J. Oreglia, A. K. Honma, C. Y. Chang, G. N. Patrick, C. Burgard, J. Steuerer, S. W. O'Neale, K. J. Anderson, Raimund Ströhmer, T. J. Smith, P. Schütz, M. Sasaki, I. P. Duerdoth, E. Lefebvre, F. Odorici, R. Howard, Claude Leroy, D. R. Rust, J. P. Pansart, P.G. Bright-Thomas, F. C. Grant, M. A. Whalley, A. Buijs, D. M. Strom, C. Stegmann, R. Van Kooten, M. H. Lehto, C.J. Beeston, T. G. Shears, Gy. Wolf, P. Berlich, D. Karlen, O. Schaile, N. J. Tresilian, Fabrizio Fabbri, D. Van den plas, and R. Bartoldus
Subjects: Quark, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Multiplicity (mathematics), Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Parton shower
Abstract: We report a study of forward-backward multiplicity correlations and a measurement of the dependence on charged multiplicity of the mean transverse momentum of charged hadrons, measured with respect to the thrust axis. The study was performed on a high statistics sample of Z(0) decays to multihadronic final states collected by the OPAL Collaboration at LEP. The positive forward-backward multiplicity correlation observed in our inclusive sample can be understood in terms of a superposition of distinct event topologies characterized by a different amount of hard gluon radiation (2-, 3- and 4-jet events) and with different mean multiplicities. The residual positive correlation that we see in a clean 2-jet sample can be interpreted in terms of fragmentation properties of different quark flavours and of the production and decay of resonances. We have compared the observed effects with the predictions of QCD-based parton shower models. The data are well described by the Jetset 7.3 Monte Carlo, while Herwig 5.5 does not satisfactorily reproduce the measured correlations. Hard gluon radiation is also shown to be responsible for the observed increase of about 40% in the mean transverse momentum of produced charged hadrons in the multiplicity range from 10 to 30. The comparison with the results obtained in an analysis of a sample enriched in Z(0) --> b $$($) over bar b events, shows that the presence of heavy flavours does not contribute significantly to the observed effect.
Published: 1994

16. Measurement of $$\Gamma ({\rm Z}^0 \to b\bar b)/\Gamma ({\rm Z}^0 \to hadrons)$$ using leptons

Author: M. Hauschild, P. Singh, Tohru Takeshita, C. Markus, J. Hart, P. Paschievici, R. W. L. Jones, J. D. Gillies, Georges Azuelos, B. Panzer-Steindel, J. F. Kral, Gideon Alexander, Horst Breuker, K. W. Bell, Max Weber, D. J. Miller, J. C. Hill, Paolo Capiluppi, D. Pitman, P. Igo-Kemenes, G. Maringer, M. Jobes, U. Binder, P. E.L. Clarke, J. Steuerer, C. Y. Chang, M. F. Turner, Gideon Bella, H. O. Ogren, Christoph Geich-Gimbel, A. Astbury, F. Lamarche, H. J. Burckhart, Jacqueline Batley, J. Kroll, H. Jeremie, O. Ganel, R. E. Hughes-Jones, U. Maur, P. Taras, P. Scharff-Hansen, A. J. Martin, R. J. Hemingway, M. H. Lehto, Mitsuaki Nozaki, W. J. Collins, Ehud Duchovni, R. Shypit, C. Moisan, J. P. Walker, G. A. Beck, P. Teixeira-Dias, S. L. Lloyd, F. X. Gentit, J. E. Conboy, Silvia Arcelli, A. M. Smith, A. Simon, Otmar Biebel, T. G. Shears, V. Gibson, P. Jovanovic, S. Barnett, H. Ihssen, T. Behnke, Austin Ball, R. Yaari, B. Schmitt, S. W. Gensler, A. Pouladdej, G. E. Richards, D. G. Charlton, D. L. Wagner, G. Vasseur, B. Lorazo, T. W. Pritchard, S. Bethke, D. Menszner, S. J. Hillier, E. do Couto e Silva, C. J. Virtue, Marco Cuffiani, Margret Fincke-Keeler, P. Pfister, Alessandro Montanari, D. Hochman, N. J. Thackray, C. K. Hargrove, T. J. Smith, K. Stephens, P. Berlich, H. Deng, R. Humbert, J. R. McNutt, L. Köpke, J. Goldberg, B. Nellen, James Pinfold, M. Jimack, C. Wahl, F. S. Merritt, S. L. Chu, M. Hansroul, D. G. Fong, J. Gascon, H. von der Schmitt, P. Leblanc, Michael Dittmar, G. Yekutieli, Norbert Wermes, J. E. Pilcher, A. D. Schaile, C. H. Shepherd-Themistocleous, R. J. Homer, D. R. Rust, B. C. Shen, P. A. Elcombe, N. Paz-Jaoshvili, T. Kawamoto, G. Quast, S. W. O'Neale, H. G. Evans, P. F. Harrison, M. J. Goodrick, I. Cohen, R. J. Sobie, S. Orito, R. G. Kellogg, John Baines, V. H. Winterer, G. D. Lafferty, John Hobbs, A. K. Honma, D. S. Koetke, W. G. Scott, M. Rosvick, R. Mir, Marcello Mannelli, J. E. Duboscq, P. D. Acton, Andris Skuja, M. Tecchio, Stefano Marcellini, W. R. Gibson, J. A. McKenna, James Letts, A. A. Carter, P. M. Hattersley, J. W. Gary, M. Yurko, R. Kowalewski, J. Becker, K. J. Anderson, D. R. Ward, G. Transtromer, Tetsuro Mashimo, P. G. Estabrooks, R. K. Keeler, B. Boden, Claude Leroy, J. P. Pansart, B. Poli, G. J. VanDalen, F. Odorici, R. F. McGowan, J. Mildenberger, Harold Nguyen, M. J. Oreglia, J. C. Clayton, P. M. Watkins, W. Gorn, R. Van Kooten, A. Beck, G. A. Bahan, P. W. Jeffreys, P. P. Allport, T. Mouthuy, O. Schaile, N. I. Geddes, C. Jui, F. G. Oakham, J. M. Roney, P. S. Wells, E. Heflin, S. Wotton, A. T. Watson, T. Kobayashi, A. M. Lee, J. Banks, N. J. Tresilian, G. N. Patrick, R. M. Brown, R. D. Heuer, M. Sasaki, J. M. Lorah, Lorne Levinson, M. Coupland, F. C. Grant, M. A. Whalley, Paul Kyberd, F. K. Loebinger, Fabrizio Fabbri, W. Mohr, D. Van den plas, Kiyotomo Kawagoe, H. Mes, A. M. Rossi, Shlomo Dado, Erez Etzion, A. Buijs, D. M. Strom, M. W. Redmond, I. P. Duerdoth, Stefan Kluth, Shlomit Tarem, T. Tsukamoto, B. W. Kennedy, Gilles Beaudoin, A. Rollnik, P. Poffenberger, E. Torrente-Lujan, R. Giacomelli, S. Levegrün, H. M. Fischer, A. Michelini, A. C. Janissen, S. Rossberg, C. J. Oram, G. Mikenberg, A. Gaidot, M. Kuwano, J. von Krogh, T. Wlodek, M. Sproston, R. P. Middleton, P. Routenburg, N. Tesch, A. Dieckmann, D. E. Plane, P. Bentkowski, Dave Robinson, J. R. Carter, G. M. Dallavalle, L. A. del Pozo, S. Schreiber, T. J. McMahon, D. J.P. Dumas, X. C. Lou, J. Schwiening, R. K. Carnegie, J. A. Wilson, P. Bright-Thomas, W. Schappert, P. Weber, R. Lahmann, D. C. Imrie, M. A. Thomson, G. P. Siroli, Christoph Schwick, G. A. Snow, C. P. Ward, D. L. Rees, T. R. Wyatt, R. J. Barlow, H. Przysiezniak, M. J. Losty, M. Fierro, T. Hilse, O. Runolfsson, Claudio Grandi, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, J. P. Martin, M. Morii, Peter R Hobson, Sachio Komamiya, S. De Jong, E. Ros, T. P. Kokott, Carla Sbarra, J. G. Layter, I. J. Bloodworth, A. Yeaman, N. K. Watson, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, C. Burgard, P. Mättig, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, D. A. Hinshaw, J. Allison, G. Duckeck, R. Ströhmer, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, and P. Bock
Subjects: Physics, Nuclear physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Electron, Width ratio, Engineering (miscellaneous), High momentum, Lepton
Abstract: The fraction of $$b\bar b$$ events in hadronicZ 0 decays has been measured from the yield of leptons in the data samples collected by OPAL in 1990 and 1991. A sample enriched in events containing $${\rm Z}^0 \to b\bar b$$ decays was obtained by requiring the presence of an electron or muon with high momentum and high momentum component transverse to the associated hadronic jet. After accounting for backgrounds and acceptances, a value of $$\frac{{\Gamma ({\rm Z}^0 \to b\bar b)}}{{\Gamma ({\rm Z}^0 \to hadrons)}} = 0.220 \pm 0.002 \pm 0.0006 \pm 0.011$$ was obtained. The first two errors reflect the data statistics and the systematic uncertainties arising from detector modelling uncertainties, respectively. The third error includes systematic effects fromb andc fragmentation and decay uncertainties.
Published: 1993

17. A measurement ofΓ (Z 0→b $$\Gamma ({\rm Z}^0 \to b\bar b)$$ /Γ(Z 0→hadrons) using an impact parameter technique

Author: Sachio Komamiya, E. Ros, A. T. Watson, A. Astbury, A. Skillman, U. Müller, T. P. Kokott, A. J. Martin, A. Luig, G. A. Snow, C. P. Ward, A. Gaidot, D. L. Rees, P. E.L. Clarke, I. J. Bloodworth, D. A. Hinshaw, James Pinfold, M. Kuwano, T. Wlodek, M. Sproston, J. Steuerer, D. G. Fong, Randall Sobie, G. D. Lafferty, J. Gascon, H. von der Schmitt, H. Przysiezniak, M. Fierro, P. Routenburg, N. Tesch, A. Dieckmann, M. Settles, T. W. Pritchard, F. Lamarche, R. J. Hemingway, C. K. Hargrove, G. Beaudoin, T. Behnke, Silvia Arcelli, P. Jovanovic, M. Foucher, T. Hilse, J. Mildenberger, Harold Nguyen, H. Takeda, F. G. Oakham, J. W. Gary, O. Runolfsson, F. S. Merritt, Austin Ball, Marcello Mannelli, J. E. Duboscq, D. Menszner, R. Yaari, Tohru Takeshita, Shlomo Dado, G. W. Wilson, Alessandro Montanari, D. Karlen, C. Beeston, C. Burgard, J. Hart, Claudio Grandi, S. Bethke, Marco Cuffiani, J. D. Gillies, M. W. Redmond, Otmar Biebel, Andris Skuja, R. J. Barlow, D. J. Miller, X. C. Lou, P. Igo-Kemenes, Georges Azuelos, G. Duckeck, R. Ströhmer, J. M. Lorah, M. J. Pearce, Horst Breuker, G. E. Richards, M. Yurko, Tetsuro Mashimo, P. W. Jeffreys, H. Jeremie, C. M. Hawkes, M. Cooper, J. F. Kral, U. Maur, K. W. Bell, D. G. Charlton, D. L. Wagner, G. T. Zorn, Giora Mikenberg, Daniel Lellouch, John Allison, W. Mohr, S. L. Chu, Gunter Wolf, Gregor Herten, Takehiko Mori, Max Weber, C. Wahl, J. C. Hill, Misao Sasaki, C. Jui, H. M. Bosch, Wolfram Dietrich Zeuner, J. M. Roney, P. Bright-Thomas, B. Wilkens, Matthias Schröder, E. do Couto e Silva, H. Mes, W. Gorn, P. A. Elcombe, I. P. Duerdoth, D. Axen, A. Jawahery, M. A. Thomson, R. G. Kellogg, M. Morii, H. Deng, R. Humbert, H. Lafoux, B. C. Shen, D. S. Koetke, Madjid Boutemeur, Peter Sherwood, J. A. McKenna, John Hobbs, Peter R Hobson, J. E. Pilcher, N. Paz-Jaoshvili, A. K. Honma, W. G. Scott, R. W. Springer, Alexander Wagner, Stefano Marcellini, James Letts, J. Hagemann, J. Ludwig, P. Scharff-Hansen, B. Fabbro, P. G. Estabrooks, R. K. Keeler, B. Panzer-Steindel, K. Runge, P. Bock, A. D. Schaile, R. Kowalewski, J. Becker, M. Hauschild, C. Markus, P. Paschievici, P. M. Watkins, M. J. Losty, Paul Kyberd, F. K. Loebinger, Gideon Bella, V. H. Winterer, A. M. Smith, G. J. VanDalen, Ehud Duchovni, S. Wotton, H. J. Burckhart, G. Vasseur, Jacqueline Batley, B. Lorazo, Norbert Wermes, P. Mättig, Sherry Towers, T. Kawamoto, R.J. Akers, R. Lahmann, D. C. Imrie, A. Rollnik, R. Giacomelli, O. Schaile, R. Bartoldus, J. Goldberg, S. Orito, M. Rosvick, B. Nellen, R. Mir, P. Leblanc, F. Odorici, H. G. Evans, M. J. Goodrick, I. Cohen, H. O. Ogren, Christoph Geich-Gimbel, M. Jimack, M. J. Oreglia, A. Yeaman, N. K. Watson, Erez Etzion, Stefan Kluth, Shlomit Tarem, J. R. Carter, S. Rossberg, C. J. Oram, G. N. Patrick, R. P. Middleton, J. Kroll, F. X. Gentit, J. E. Conboy, A. Pouladdej, H. Ihssen, S. W. O'Neale, S. W. Gensler, G. P. Siroli, K. J. Anderson, S. J. Hillier, Christoph Schwick, T. Kobayashi, C. J. Virtue, P. Poffenberger, Kiyotomo Kawagoe, W. R. Gibson, C. Y. Chang, M. F. Turner, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, P. Weber, B. W. Kennedy, E. Torrente-Lujan, D. E. Plane, P. Bentkowski, G. M. Dallavalle, D. J.P. Dumas, Gideon Alexander, Paolo Capiluppi, P. M. Hattersley, P. F. Harrison, P. D. Acton, Stephen Lloyd, M. Tecchio, T. J. Smith, K. Stephens, J. R. McNutt, V. Gibson, G. Quast, John Baines, D. R. Ward, G. Transtromer, A. M. Rossi, J. C. Clayton, T. Tsukamoto, S. Levegrün, H. M. Fischer, A. Michelini, A. C. Janissen, D. R. Rust, S. A. Robins, A. M. Lee, S. Barnett, C. Sbarra, D. Hochman, Michael Dittmar, G. Yekutieli, A. A. Carter, Roger Jones, J. Banks, N. J. Tresilian, R. D. Heuer, R. Van Kooten, Fabrizio Fabbri, D. Van den plas, N. I. Geddes, D. Pitman, M. H. Lehto, B. Boden, B. Poli, T. G. Shears, D. M. Gingrich, P. Berlich, L. Köpke, J. P. Martin, T. J. McMahon, M. Hansroul, S. De Jong, J. Schwiening, R. K. Carnegie, C. H. Shepherd-Themistocleous, J. A. Wilson, R. J. Homer, W. Schappert, Margret Fincke-Keeler, J. G. Layter, R. E. Hughes-Jones, J. von Krogh, P. Pfister, G. G. Hanson, G. Giacomelli, Dave Robinson, P. Schenk, M. S. Dixit, Frans Meijers, L. A. del Pozo, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, P. S. Wells, Terry Richard Wyatt, M. Coupland, F. C. Grant, M. A. Whalley, A. Buijs, D. M. Strom, C. Stegmann, M. Jones, Claude Leroy, and J. P. Pansart
Subjects: Quark, Physics, Partial width, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Analytical chemistry, Elementary particle, Standard Model, High Energy Physics::Experiment, Impact parameter, Engineering (miscellaneous), Bar (unit)
Abstract: The fractional partial width of theZ0 tob quarks,$\Gamma _{b\bar b} /\Gamma _{had} $, has been measured by OPAL using an impact parameter technique. The method has been developed using 130 000 hadronic events collected by OPAL in 1990. We find: $$\frac{{\Gamma _{b\bar b} }}{{\Gamma _{had} }} = 0.222 \pm 0.007(stat) \pm 0.008(sys).$$ The measurement assumes the relative rates of theZ0 touds andc quarks given by the Standard Model. Varying the charm fraction from the Standard Model value of$\Gamma _{c\bar c} /\Gamma _{had} = 0.171$ changes the result by an additional$\Delta \Gamma _{b\bar b} /\Gamma _{b\bar b} = - 0.135 \times \Delta \Gamma _{c\bar c} /\Gamma _{c\bar c} $.
Published: 1993

18. Studies of strong and electroweak interactions using final state photon emission in hadronicZ 0 decays

Author: B. C. Shen, Gideon Bella, A. K. Honma, H. J. Burckhart, Jacqueline Batley, W. G. Scott, V. Gibson, G. Quast, Tara Shears, John Baines, R. Kowalewski, Horst Breuker, M. J. Losty, R. Lahmann, D. C. Imrie, T. J. Smith, M. Morii, D. R. Ward, G. Transtromer, Peter R Hobson, P. Mättig, H. O. Ogren, R. Mir, I. J. Bloodworth, P. S. Wells, James Pinfold, T. Mouthuy, C. Y. Chang, M. F. Turner, G. P. Siroli, P. A. Elcombe, Christoph Schwick, Terry Richard Wyatt, S. Barnett, P. Taras, J. Mildenberger, M. Settles, M. Coupland, Christoph Geich-Gimbel, D. G. Fong, Sachio Komamiya, Harold Nguyen, G. T. Zorn, G. Beaudoin, D. Hochman, N. J. Thackray, E. Ros, J. Gascon, H. von der Schmitt, A. Astbury, Mitsuaki Nozaki, M. J. Oreglia, M. Foucher, O. Ganel, F. C. Grant, M. A. Whalley, A. J. Martin, J. Becker, J. Goldberg, A. M. Rossi, C. K. Hargrove, T. P. Kokott, Carla Sbarra, F. Odorici, N. Paz-Jaoshvili, M. Hauschild, Shlomo Dado, J. W. Gary, T. Tsukamoto, B. Nellen, P. Leblanc, S. Levegrün, G. J. VanDalen, G. W. Wilson, J. C. Clayton, D. Karlen, C. Burgard, Marcello Mannelli, J. E. Duboscq, A. Buijs, D. M. Strom, X. C. Lou, C. Markus, P. Paschievici, J. R. Carter, G. N. Patrick, Tohru Takeshita, H. G. Evans, P. Igo-Kemenes, G. Maringer, M. J. Goodrick, I. Cohen, Giora Mikenberg, D. Axen, A. Jawahery, H. Jeremie, Kiyotomo Kawagoe, A. Simon, Otmar Biebel, Georges Azuelos, C. M. Hawkes, P. E.L. Clarke, J. Steuerer, Andris Skuja, M. Cooper, P. Singh, G. Tysarczyk-Niemeyer, R. E. Hughes-Jones, U. Maur, Erez Etzion, G. E. Richards, Daniel Lellouch, D. L. Wagner, C. Jui, Tetsuro Mashimo, Stefan Kluth, Shlomit Tarem, Peter Sherwood, H. Deng, R. Humbert, J. F. Kral, K. W. Bell, P. G. Estabrooks, Max Weber, S. W. O'Neale, Paul Kyberd, F. K. Loebinger, N. I. Geddes, R. W. L. Jones, K. J. Anderson, R. W. Springer, Alexander Wagner, Takehiko Mori, H. Mes, S. Rossberg, C. J. Oram, J. C. Hill, Misao Sasaki, M. Hansroul, J. Hagemann, E. do Couto e Silva, I. P. Duerdoth, M. W. Redmond, W. Gorn, Richard Keeler, J. Ludwig, K. Runge, R. P. Middleton, F. G. Oakham, P. M. Watkins, B. Boden, P. Weber, A. Yeaman, B. Poli, Norbert Wermes, J. Kroll, P. Bock, B. Panzer-Steindel, G. A. Snow, C. P. Ward, A. Rollnik, R. Giacomelli, M. Jobes, U. Binder, J. M. Lorah, P. Scharff-Hansen, C. H. Shepherd-Themistocleous, D. L. Rees, T. Kawamoto, J. Hart, O. Schaile, F. X. Gentit, P. Poffenberger, S. Wotton, R. J. Homer, H. M. Fischer, S. Orito, M. Rosvick, J. D. Gillies, A. Michelini, J. E. Conboy, W. Mohr, J. Banks, Claude Leroy, J. P. Pansart, Silvia Arcelli, A. C. Janissen, M. Jimack, John Allison, R. Yaari, S. Bethke, Marco Cuffiani, A. D. Schaile, N. J. Tresilian, G. Duckeck, R. Ströhmer, N. K. Watson, C. Moisan, J. P. Walker, M. A. Thomson, A. M. Smith, G. A. Beck, D. G. Charton, R. J. Barlow, G. Vasseur, B. Lorazo, R. D. Heuer, P. Teixeira-Dias, Fabrizio Fabbri, A. Gaidot, R. G. Kellogg, D. J. Miller, A. Pouladdej, D. Van den plas, M. Kuwano, T. Wlodek, M. Sproston, D. S. Koetke, Stefano Marcellini, P. M. Hattersley, D. R. Rust, B. Schmitt, H. M. Bosch, S. L. Chu, J. M. Roney, P. Routenburg, James Letts, N. Tesch, A. Dieckmann, Wolfram Dietrich Zeuner, Margret Fincke-Keeler, F. Lamarche, V. H. Winterer, F. S. Merritt, D. A. Hinshaw, R. J. Hemingway, D. Pitman, M. H. Lehto, T. Behnke, P. Jovanovic, J. A. McKenna, Austin Ball, D. Menszner, R. F. McGowan, G. A. Bahn, John Hobbs, P. Berlich, Alessandro Montanari, L. Köpke, W. J. Collins, C. Wahl, Randall Sobie, G. D. Lafferty, J. E. Pilcher, T. W. Pritchard, S. Schreiber, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, J. von Krogh, Dave Robinson, L. A. del Pozo, Michael Dittmar, G. Yekutieli, A. A. Carter, R. Van Kooten, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, E. Torrente-Lujan, M. Yurko, P. W. Jeffreys, A. M. Lee, D. E. Plane, P. Bentkowski, P. Bright-Thomas, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, H. Przysiezniak, M. Fierro, P. F. Harrison, T. Hilse, P. D. Acton, Stephen Lloyd, O. Runolfsson, M. Tecchio, Phillip Allport, Gideon Alexander, Paolo Capiluppi, Claudio Grandi, Ehud Duchovni, R. Shypit, H. Ihssen, S. W. Gensler, S. J. Hillier, T. Kobayashi, C. J. Virtue, P. Pfister, J. G. Layter, J. P. Martin, S. De Jong, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, K. Stephens, and J. R. McNutt
Subjects: Quantum chromodynamics, Physics, Quark, Particle physics, Photon, Physics and Astronomy (miscellaneous), Hadron, Electroweak interaction, Type (model theory), Jet (particle physics), Standard Model, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The cross section and jet rates ofZ0 decays into photons and quarks are compared with matrix element Monte Carlos ofO(ααs). Good agreement is found between data and theoretical predictions. From the ratio of events with three jets plus a photon to those with two jets plus a photon, αs in first order is determined to be 0.176±0.010. Combining the cross section of final state photon events with the LEP average hadronic partial decay width of theZ0, the widths of theZ0 into up and down type quarks can be calculated. The results $$\begin{gathered} \Gamma _{u - type} = 242 \pm 46MeV; \hfill \\ \Gamma _{d - type} = 419 \pm 30MeV \hfill \\ \end{gathered} $$ are in good agreement with the standard model expectation. A comparison of the measured cross section as a function ofycut with predictions of QCD shower models shows that, at the current level of accuracy ARIADNE and, to a lesser extent, HERWIG and JETSET can reproduce the measurement.
Published: 1993

19. Measurement of the B0 and B+ lifetimes

Author: W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, G. Transtromer, B. W. Kennedy, E. Torrente-Lujan, M. Fincke-Keeler, D. E. Plane, P. Bentkowski, Alan Watson, D. J.P. Dumas, Silvia Arcelli, Tara Shears, P. Igo-Kemenes, G. Maringer, R. Sobie, H. Jeremie, R. E. Hughes-Jones, U. Maur, P. Bright-Thomas, Horst Breuker, H. M. Fischer, E. do Couto e Silva, J. Pinfold, C. Burgard, F. C. Grant, P. E.L. Clarke, M. A. Whalley, A. Michelini, A. C. Janissen, O. Ganel, G. A. Snow, C. P. Ward, R. Yaari, H. O. Ogren, Christoph Geich-Gimbel, A. Simon, D. L. Rees, A. Buijs, M. Jobes, Otmar Biebel, G. E. Richards, U. Binder, D. G. Charlton, D. L. Wagner, P. G. Estabrooks, N. Paz-Jaoshvili, P. Scharff-Hansen, J. Kroll, G. Yekutieli, F. X. Gentit, H. Deng, R. Humbert, J. E. Conboy, P. M. Watkins, G. Beaudoin, D. R. Rust, A. Pouladdej, Paul Kyberd, F. K. Loebinger, B. C. Shen, C. Schwick, A. M. Smith, F. S. Merritt, J. Steuerer, D. Strom, G. Vasseur, B. Lorazo, Kiyotomo Kawagoe, A. Astbury, M. W. Redmond, W. G. Scott, Richard Keeler, Norbert Wermes, T. Kawamoto, G. M. Dallavale, N. I. Geddes, A. J. Martin, J. A. McKenna, Shlomo Dado, A. Rollnik, R. Giacomelli, F. G. Oakham, D. Hochman, C. Y. Chang, M. F. Turner, M. Morii, S. Bethke, P. Taras, Peter R Hobson, R. Kowalewski, B. Boden, Marco Cuffiani, Mitsuaki Nozaki, R. F. McGowan, Claude Leroy, D. G. Fong, J. P. Pansart, B. Poli, J. Gascon, J. Hart, S. Orito, P. Weber, S. Tarem, T. Behnke, Sachio Komamiya, E. Ros, X. C. Lou, H. von der Schmitt, M. J. Losty, M. Jimack, H. Ihssen, John Allison, G. Quast, C. K. Hargrove, S. L. Chu, J. R. McNutt, J. D. Gillies, Gideon Bella, P. Pfister, R. Mir, S. W. Gensler, T. P. Kokott, Carla Sbarra, T. Hilse, J. Banks, J. W. Gary, H. J. Burckhart, Jacqueline Batley, T. Mouthuy, S. J. Hillier, P. Paschievici, T. Kobayashi, C. J. Virtue, N. J. Tresilian, P. S. Wells, Terry Richard Wyatt, Marcello Mannelli, J. E. Duboscq, R. D. Heuer, R. G. Kellogg, J. von Krogh, O. Runolfsson, Andris Skuja, Fabrizio Fabbri, M. Coupland, R. J. Barlow, D. Van den plas, G. T. Zorn, O. Schaile, S. Barnett, D. J. Miller, D. S. Koetke, A. D. Schaile, John Hobbs, Tetsuro Mashimo, Dave Robinson, Stefano Marcellini, T. Wlodek, Tohru Takeshita, M. H. Lehto, L. A. del Pozo, James Letts, N. J. Thackray, V. H. Winterer, A. M. Rossi, T. Tsukamoto, S. Levegrün, K. Stephens, Michael Dittmar, F. Lamarche, Claudio Grandi, Georges Azuelos, P. F. Harrison, W. Gorn, M. J. Oreglia, A. Yeaman, J. Mildenberger, Harold Nguyen, R. J. Hemingway, M. A. Thomson, J. F. Kral, K. W. Bell, G. A. Bahan, D. Pitman, A. A. Carter, P. Singh, N. K. Watson, Stephen Lloyd, P. M. Hattersley, Max Weber, M. Tecchio, C. Moisan, J. P. Walker, R. Van Kooten, V. Gibson, P. Berlich, P. Jovanovic, A. Gaidot, M. Sproston, L. Köpke, W. J. Collins, M. Hauschild, J. C. Hill, Misao Sasaki, G. A. Beck, J. R. Carter, Austin Ball, R. W. L. Jones, G. N. Patrick, John Baines, G. D. Lafferty, P. Poffenberger, R. Lahmann, D. Menszner, P. Teixeira-Dias, Phillip Allport, S. W. O'Neale, B. Panzer-Steindel, S. Schreiber, P. Routenburg, C. Markus, C. J. Oram, N. Tesch, A. Dieckmann, Alessandro Montanari, T. W. Pritchard, T. J. McMahon, K. J. Anderson, G. P. Siroli, J. Schwiening, D. R. Ward, J. P. Martin, R. K. Carnegie, P. A. Elcombe, J. Hagemann, D. C. Imrie, H. Przysiezniak, B. Schmitt, J. C. Clayton, J. A. Wilson, S. De Jong, M. Fierro, M. Yurko, M. Rosvick, J. Becker, W. Schappert, A. Wagner, P. W. Jeffreys, A. M. Lee, C. Wahl, G. J. VanDalen, L. Levinson, R. Shypit, M. Hansroul, C. Jui, J. E. Pilcher, D. Lellouch, C. H. Shepherd-Themistocleous, R. J. Homer, J. M. Lorah, W. Mohr, Gideon Alexander, Paolo Capiluppi, D. A. Hinshaw, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, G. Duckeck, R. Ströhmer, F. Odorici, H. M. Bosch, Wolfram Dietrich Zeuner, G. Mikenberg, H. Mes, I. P. Duerdoth, M. Kwano, J. M. Roney, I. J. Bloodworth, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, A. K. Honma, T. J. Smith, P. Mättig, C. M. Hawkes, M. Cooper, Takehiko Mori, P. D. Acton, E. Duchovni, Erez Etzion, Stefan Kluth, S. Rossberg, J. G. Layter, R. P. Middleton, S. Wotton, G. G. Hanson, J. Goldberg, B. Nellen, P. Leblanc, G. Giacomelli, H. G. Evans, M. J. Goodrick, I. Cohen, P. Schenk, M. S. Dixit, and Frans Meijers
Subjects: Nuclear physics, Physics, Hadronic decay, Nuclear and High Energy Physics, Meson, Silicon, chemistry, Electron–positron annihilation, Hadron, chemistry.chemical_element, Particle Physics - Experiment
Abstract: From a data sample of approximately 240 000 hadronic Z 0 decays recorded during 1991 a sample of about 130 semileptonic B hadron decays containing a D 0 , D + or D ∗+ has been isolated. Using silicon microvertex detector information the decay vertices in these events have been reconstructed. The average B hadron lifetime of the mix of B hadrons in this event sample is measured to be 1.51 −0.14 +0.16 ±0.11 ps. From the distribution of decay times in the different samples the lifetimes of the B 0 and B + mesons are determined to be 1.51 −0.23−0.14 +0.24+0.12 ps and 1.51 −0.28−0.14 +0.30+0.12 ps, respectively. The measured ratio of the B + to B 0 lifetimes of 1.00 −0.25 +0.33 ±0.08 supports expectations that the lifetimes are similar.
Published: 1993

20. Measurement of the averageb hadron lifetime inZ 0 decays

Author: J. Mildenberger, Harold Nguyen, A. Astbury, G. Beaudoin, C. Moisan, G. A. Beck, U. Müller, A. J. Martin, Erez Etzion, Achim Stahl, P. Teixeira-Dias, Tohru Takeshita, I. J. Bloodworth, Shlomo Dado, K. Stephens, Stefan Kluth, A. Skillman, J. R. McNutt, F. S. Merritt, B. Schmitt, Shlomit Tarem, J. G. Layter, Georges Azuelos, A. Gaidot, M. Kuwano, T. Wlodek, D. Axen, C. K. Hargrove, M. Settles, X. C. Lou, A. Jawahery, F. Odorici, M. Sproston, J. F. Kral, K. W. Bell, R. Batoldus, V. Gibson, H. Takeda, G. Quast, Madjid Boutemeur, James Pinfold, D. G. Fong, J. Hart, J. D. Gillies, F. G. Oakham, D. Pitman, S. Rossberg, C. J. Oram, John Baines, T. J. McMahon, M. Foucher, D. J. Miller, J. Gascon, H. von der Schmitt, Gideon Bella, P. Routenburg, N. I. Geddes, Max Weber, Peter Sherwood, F. Lamarche, Margret Fincke-Keeler, Matthias Schröder, Giora Mikenberg, P. Jovanovic, H. J. Burckhart, Sachio Komamiya, C. Jui, Austin Ball, M. H. Lehto, P. G. Estabrooks, R. K. Keeler, N. Tesch, A. Dieckmann, D. Menszner, E. Ros, A. T. Watson, Alessandro Montanari, Paul Kyberd, F. K. Loebinger, J. C. Hill, Misao Sasaki, R. W. Springer, Alexander Wagner, Gideon Alexander, H. Lafoux, R. P. Middleton, Otmar Biebel, Paolo Capiluppi, S. L. Chu, Marcello Mannelli, J. E. Duboscq, G. W. Wilson, D. R. Ward, G. E. Richards, D. E. Plane, C. Y. Chang, J. Schwiening, D. Karlen, C. Burgard, J. Hagemann, J. Ludwig, B. C. Shen, Andris Skuja, T. G. Shears, J. A. McKenna, N. Paz-Jaoshvili, G. Transtromer, D. G. Charlton, D. L. Wagner, B. Boden, K. Runge, Gunter Wolf, A. D. Schaile, Tetsuro Mashimo, P. Bentkowski, T. P. Kokott, P. M. Watkins, P. Igo-Kemenes, P. A. Elcombe, R. K. Carnegie, A. Luig, P. Bock, J. P. Martin, B. Poli, A. K. Honma, Ehud Duchovni, V. H. Winterer, C. M. Hawkes, M. Cooper, M. W. Redmond, P. M. Hattersley, H. Deng, R. Humbert, Daniel Lellouch, J. R. Batley, D. M. Gingrich, Silvia Arcelli, G. A. Snow, C. P. Ward, D. J.P. Dumas, S. De Jong, W. G. Scott, H. Ihssen, H. Jeremie, W. Gorn, P. Pfister, A. Rollnik, R. Giacomelli, J. A. Wilson, H. M. Fischer, D. L. Rees, Takehiko Mori, John Hobbs, W. R. Gibson, J. Becker, S. W. Gensler, R. Kowalewski, R. Lahmann, H. Mes, U. Maur, P. Berlich, A. Michelini, A. C. Janissen, S. Wotton, S. J. Hillier, T. Kobayashi, C. J. Virtue, L. Köpke, J. C. Clayton, D. C. Imrie, D. A. Hinshaw, P. Scharff-Hansen, J. W. Gary, W. Schappert, Randall Sobie, G. D. Lafferty, A. Beck, I. P. Duerdoth, M. J. Losty, J. M. Roney, S. A. Robins, A. M. Smith, E. Heflin, P. E.L. Clarke, T. W. Pritchard, Norbert Wermes, Sherry Towers, G. P. Siroli, Christoph Schwick, J. Steuerer, D. R. Rust, G. Vasseur, B. Lorazo, J. Goldberg, R. M. Brown, Lorne Levinson, G. J. VanDalen, M. Morii, M. Jimack, Peter R Hobson, M. J. Pearce, Horst Breuker, B. Nellen, P. F. Harrison, G. M. Dallavalle, E. do Couto e Silva, P. Leblanc, P. D. Acton, Stephen Lloyd, M. Tecchio, E. Torrente-Lujan, Roger Barlow, John Allison, G. G. Hanson, R. E. Hughes-Jones, H. O. Ogren, T. Behnke, Kiyotomo Kawagoe, Christoph Geich-Gimbel, S. Orito, M. Rosvick, M. Hansroul, H. G. Evans, M. J. Goodrick, R. Yaari, J. von Krogh, A. M. Lee, T. J. Smith, S. Bethke, Marco Cuffiani, I. Cohen, R. Mir, P. Schenk, P. Weber, J. E. Conboy, R. G. Kellogg, M. S. Dixit, A. Yeaman, Frans Meijers, Dave Robinson, D. S. Koetke, A. M. Rossi, N. K. Watson, J. M. Lorah, C. H. Shepherd-Themistocleous, L. A. del Pozo, C. Sbarra, T. Tsukamoto, Stefano Marcellini, S. Levegrün, J. Kroll, R. J. Homer, G. Duckeck, R. Ströhmer, James Letts, W. Mohr, P. Mättig, Michael Dittmar, G. Yekutieli, F. X. Gentit, G. T. Zorn, A. A. Carter, M. J. Oreglia, Roger Jones, R. Van Kooten, H. M. Bosch, Wolfram Dietrich Zeuner, A. Pouladdej, B. Fabbro, J. R. Carter, B. Panzer-Steindel, G. N. Patrick, G. Giacomelli, J. Banks, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, S. Barnett, D. Hochman, M. Yurko, P. W. Jeffreys, P. Bright-Thomas, R. J. Hemingway, M. A. Thomson, T. Hilse, O. Runolfsson, C. Beeston, Claudio Grandi, H. Przysiezniak, M. Fierro, P. Poffenberger, M. Hauschild, C. Markus, P. Paschievici, F. C. Grant, R.J. Akers, O. Schaile, M. A. Whalley, Gregor Herten, C. Wahl, B. Wilkens, J. E. Pilcher, S. W. O'Neale, K. J. Anderson, M. F. Turner, B. W. Kennedy, A. Buijs, D. M. Strom, C. Stegmann, Tatsuo Kawamoto, M. Jones, Claude Leroy, J. P. Pansart, P. S. Wells, Terry Richard Wyatt, and M. Coupland
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Maximum likelihood, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Detector, Elementary particle, Electron, Nuclear physics, High Energy Physics::Experiment, Quantum field theory, Engineering (miscellaneous), Particle Physics - Experiment, Lepton
Abstract: A sample of 2610 electron candidates and 2762 muon candidates identified in hadronicZ0 decays has been used to measure the averageb hadron lifetime. These data were recorded with the OPAL detector during 1990 and 1991. Maximum likelihood fits to the distributions of the lepton impact parameters yield an averageb hadron lifetime of $$\tau _b = 1523 \pm 34 \pm 38fs$$ , where the first error is statistical and the second systematic. This result is a weighted average over the semileptonic branching fractions and production rates of theb hadrons produced inZ0 decays.
Published: 1993

21. Precision measurements of the neutral current from hadron and lepton production at LEP

Author: D. Pitman, M. H. Lehto, A. Astbury, H. O. Ogren, Christoph Geich-Gimbel, A. D. Schaile, O. Ganel, A. J. Martin, G. M. Dallavalle, J. E. Conboy, V. H. Winterer, J. von Krogh, J. Kroll, C. Wahl, C. K. Hargrove, P. E.L. Clarke, Dave Robinson, F. X. Gentit, L. A. del Pozo, P. Berlich, J. E. Pilcher, B. Boden, Kiyotomo Kawagoe, J. C. Clayton, J. Steuerer, P. M. Hattersley, A. Pouladdej, T. Hilse, L. Köpke, C. Moisan, J. P. Walker, G. A. Beck, B. Poli, Tohru Takeshita, P. Weber, S. Wotton, A. Simon, Otmar Biebel, G. E. Richards, James Pinfold, Michael Dittmar, G. Yekutieli, O. Runolfsson, P. Teixeira-Dias, J. R. Batley, P. S. Wells, Georges Azuelos, D. G. Charlton, D. L. Wagner, N. Paz-Jaoshvili, S. J. Hiller, R. Lahmann, D. C. Imrie, D. G. Fong, F. Lamarche, A. A. Carter, R. Van Kooten, G. P. Siroli, Christoph Schwick, T. Mouthuy, Terry Richard Wyatt, B. Schmitt, J. M. Lorah, J. Goldberg, K. W. Bell, N. I. Geddes, Max Weber, H. Deng, R. Humbert, Paul Kyberd, F. K. Loebinger, M. Coupland, F. S. Merritt, Silvia Arcelli, W. Mohr, O. Schaile, J. Gascon, H. von der Schmitt, B. Nellen, W. J. Collins, P. Leblanc, G. T. Zorn, J. Banks, Randall Sobie, J. C. Hill, Misao Sasaki, B. C. Shen, H. Mes, R. Yaari, M. W. Redmond, S. Bethke, Tara Shears, P. A. Elcombe, G. D. Lafferty, A. Rollnik, R. Giacomelli, P. Igo-Kemenes, G. Maringer, R. D. Heuer, Fabrizio Fabbri, C. Leroy, A. K. Honma, Richard Keeler, I. P. Duerdoth, Marco Cuffiani, D. E. Plane, C. Y. Chang, Margret Fincke-Keeler, S. Schreiber, T. J. McMahon, J. F. Kral, Horst Breuker, H. Jeremie, D. Van den plas, R. E. Hughes-Jones, A. M. Rossi, T. W. Pritchard, P. Jovanovic, H. G. Evans, J. Becker, P. F. Harrison, W. G. Scott, M. J. Goodrick, I. Cohen, Norbert Wermes, Claudio Grandi, Austin Ball, D. Menszner, G. J. VanDalen, S. W. O'Neale, J. Schwiening, R. K. Carnegie, U. Maur, J. A. McKenna, D. R. Rust, P. D. Acton, Stephen Lloyd, G. A. Snow, C. P. Ward, T. Tsukamoto, K. J. Anderson, R. Kowalewski, S. Levegrün, H. M. Fischer, M. Tecchio, P. Bentkowski, S. L. Chu, S. Barnett, J. Mildenberger, J. P. Pansart, Marcello Mannelli, J. E. Duboscq, Andris Skuja, J. A. Wilson, Harold Nguyen, E. do Coto e Silva, D. L. Rees, A. Michelini, M. A. Thomson, P. Pfister, Alessandro Montanari, A. C. Janissen, M. J. Losty, S. Orito, M. Rosvick, D. Hochman, N. J. Thackray, A. Gaidot, M. F. Turner, M. Kuwano, T. Wlodek, Ehud Duchovni, R. Shypit, R. F. McGowan, P. Taras, J. M. Roney, M. Sproston, Erez Etzion, Tetsuro Mashimo, Stefan Kluth, Shlomit Tarem, M. Hauschild, F. C. Grant, M. A. Whalley, P. Routenburg, N. Tesch, A. Dieckmann, R. Mir, Alan Watson, Mitsuaki Nozaki, W. Schappert, G. Beaudoin, K. Stephens, B. W. Kennedy, J. R. McNutt, H. Ihssen, C. Markus, S. Rossberg, C. J. Oram, P. Paschievici, W. Gorn, John Hobbs, D. J.P. Dumas, G. A. Bahan, M. Jimack, John Allison, P. G. Estabrooks, S. W. Gensler, R. P. Middleton, T. Kobayashi, V. Gibson, F. Odorici, A. Buijs, C. J. Virtue, G. Quast, M. Jobes, U. Binder, P. Poffenberger, C. Jui, P. Scharff-Hansen, W. R. Gibson, Shlomo Dado, M. J. Oreglia, M. Hansroul, D. M. Strom, John Baines, R. G. Kellogg, J. W. Gary, F. G. Oakham, A. M. Smith, P. M. Watkins, Phillip Allport, A. Beck, E. Heflin, C. H. Shepherd-Themistocleous, G. Vasseur, X. C. Lou, B. Lorazo, J. Hart, Tatsuo Kawamoto, R. J. Homer, R. M. Brown, D. S. Koetke, Lorne Levinson, Stefano Marcellini, J. R. Carter, G. N. Patrick, J. D. Gillies, Giora Mikenberg, D. R. Ward, G. Transtromer, E. Torrente-Lujan, Roger Barlow, Gideon Alexander, Paolo Capiluppi, D. J. Miller, James Letts, J. G. Layter, H. Przysiezniak, M. Fierro, M. Yurko, P. W. Jeffreys, J. P. Martin, A. M. Lee, S. De Jong, P. Bright-Thomas, R. J. Hemingway, G. G. Hanson, P. Schenk, M. S. Dixit, Frans Meijers, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, Sachio Komamiya, N. J. Tresilan, R. W. Springer, Alexander Wagner, E. Ros, P. Singh, J. Hagemann, R. W. L. Jones, T. P. Kokott, Carla Sbarra, C. M. Hawkes, M. Cooper, Daniel Lellouch, J. Ludwig, K. Runge, P. Bock, Takehiko Mori, B. Panzer-Steindel, G. Giacomelli, Gideon Bella, H. J. Burckhart, D. A. Hinshaw, A. Yeaman, N. K. Watson, T. J. Smith, T. Behnke, P. Mättig, I. J. Bloodworth, M. Morii, Peter R Hobson, M. Settles, M. Foucher, G. Duckeck, G. W. Wilson, R. Ströhmer, D. Karlen, C. Burgard, H. M. Bosch, and Wolfram Dietrich Zeuner
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Neutral current, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electroweak interaction, Nuclear physics, Pair production, High Energy Physics::Experiment, Born approximation, Engineering (miscellaneous), Particle Physics - Experiment, Bhabha scattering, Lepton
Abstract: New measurements of the hadronic and leptonic cross sections and of the leptonic forward-backward asymmetries ine+e− collisions are presented. The analysis includes data recorded up to the end of 1991 by the OPAL experiment at LEP, with centre-of-mass energies within ±3 GeV of the Z0 mass. The results are based on a recorded total of 454 000 hadronic and 58 000 leptonic events. A model independent analysis of Z0 parameters based on an extension of the improved Born approximation is presented leading to test of lepton universality and an interpretation of the results within the Standard Model framework. The determination of the mass and width of the Z0 benefit from an improved understanding of the LEP energy calibration.
Published: 1993

22. QCD coherence studies using two particle azimuthal correlations

Author: P. Singh, M. Hauschild, C. Markus, P. Paschievici, T. R. Wyatt, Silvia Arcelli, R. W. L. Jones, M. Hansroul, H. Przysiezniak, P. Le Du, J. C. Clayton, B. Panzer-Steindel, Sachio Komamiya, E. Ros, J. P. Martin, J. Hart, G. Beaudoin, G. Giacomelli, Andris Skuja, C. Wahl, J. D. Gillies, C. P. Howarth, C. H. Shepherd-Themistocleous, J. E. Pilcher, Tetsuro Mashimo, M. Jimack, John Allison, O. Schaile, R. J. Homer, D. Axen, A. Jawahery, S. De Jong, Gideon Bella, Tohru Takeshita, T. J. Smith, D. J. Miller, Shlomo Dado, T. Hilse, A. Simon, T. P. Kokott, Carla Sbarra, Otmar Biebel, G. Tysarczyk-Niemeyer, P. Mättig, O. Runolfsson, G. E. Richards, P. M. Watklins, F. C. Grant, D. G. Charlton, D. L. Wagner, P. Poffenberger, M. A. Whalley, F. S. Merritt, F. Lamarche, C. Moisan, J. P. Walker, Peter Sherwood, Georges Azuelos, W. Gorn, C. M. Hawkes, M. Cooper, Daniel Lellouch, X. C. Lou, R. Van Kooten, P. A. Elcombe, R. W. Springer, Alexander Wagner, D. Pitman, P. Teixeira-Dias, J. F. Kral, K. W. Bell, G. A. Bahan, Takehiko Mori, Claudio Grandi, N. I. Geddes, Max Weber, H. Deng, R. Humbert, G. D. Lafferty, H. Mes, P. Jovanovic, D. C. Imrie, A. Buijs, Giora Mikenberg, J. C. Hill, M. H. Lehto, Austin Ball, D. Menszner, I. P. Duerdoth, M. Yurko, Misao Sasaki, D. M. Strom, P. W. Jeffreys, B. C. Shen, I. J. Bloodworth, C. Jui, J. Hagemann, P. Igo-Kemenes, J. Ludwig, K. Runge, P. Bock, T. Mouthuy, A. M. Lee, Tatsuo Kawamoto, Alessandro Montanari, H. J. Burckardt, R. G. Kellogg, Margret Fincke-Keeler, G. Maringer, A. K. Honma, M. Settles, R. J. Hemingway, P. G. Estabrooks, D. L. Rees, J. Becker, John Hobbs, Stefano Marcellini, W. G. Scott, D. G. Fong, M. Foucher, G. J. VanDalen, A. D. Schaile, James Letts, H. Jeremie, R. E. Hughes-Jones, U. Maur, R. Kowalewski, G. P. Siroli, J. Gascon, H. von der Schmitt, P. Pfister, G. W. Wilson, A. Astbury, K. J. Anderson, D. Karlen, G. A. Snow, C. P. Ward, S. Orito, M. Rosvick, R. Mir, J. A. McKenna, C. Burgard, G. T. Zorn, S. Wotton, F. G. Oakham, G. Duckeck, V. H. Winterer, Christoph Schwick, O. Ganel, J. Mildenberger, Harold Nguyen, V. Gibson, M. J. Losty, R. Ströhmer, P. Berlich, L. Köpke, E. do Couto e Silva, A. J. Martin, P. Taras, A. Yeaman, A. M. Rossi, P. S. Wells, Marcello Mannelli, J. E. Duboscq, Mitsuaki Nozaki, T. Tsukamoto, M. J. Oreglia, B. W. Kennedy, H. M. Fischer, J. Goldberg, P. E.L. Clarke, J. Steuerer, N. K. Watson, R. F. McGowan, M. Jobes, U. Binder, A. Michelini, A. C. Janissen, J. M. Lorah, M. Coupland, B. Nellen, J. Banks, P. Scharff-Hansen, Kiyotomo Kawagoe, W. J. Collins, Randall Sobie, W. Mohr, P. Leblanc, H. M. Bosch, Wolfram Dietrich Zeuner, Paul Kyberd, F. K. Loebinger, N. J. Tresilian, S. Weisz, G. N. Patrick, J. W. Gary, S. Bougerolle, R. D. Heuer, Fabrizio Fabbri, H. O. Ogren, D. Van den plas, Richard Keeler, M. W. Redmond, Christoph Geich-Gimbel, A. M. Smith, G. Vasseur, C. K. Hargrove, T. W. Pritchard, S. Levergrün, A. Rollnik, J. M. Roney, B. Lorazo, J. R. Carter, H. G. Evans, D. R. Rust, M. J. Goodrick, F. Odorici, J. E. Conboy, N. Paz-Jaoshvili, Claude Leroy, P. Lennert, Phillip Allport, I. Cohen, J. P. Pansart, P. Weber, J. Kroll, A. Gaidot, F. X. Gentit, R. Yaari, M. Kuwano, T. Wlodek, M. Sproston, S. Bethke, B. Boden, D. A. Hinshaw, Marco Cuffiani, P. Routenburg, B. Poli, A. Pouladdej, N. Tesch, A. Dieckmann, Erez Etzion, Tara Shears, J. R. Batley, D. E. Plane, C. Y. Chang, Stefan Kluth, Shlomit Tarem, M. Morii, S. W. O'Neale, Stephen Hillier, Peter R Hobson, T. Behnke, S. Rossberg, C. J. Oram, Gideon Alexander, R. P. Middleton, Horst Breuker, Paolo Capiluppi, P. Schenk, Alan Watson, D. J.P. Dumas, P. M. Hattersley, W. R. Gibson, A. Beck, P. F. Harrison, E. Heflin, P. D. Acton, Stephen Lloyd, R. M. Brown, M. Tecchio, Lorne Levinson, N. Wermes, Ehud Duchovni, R. Shypit, Roger Barlow, G. G. Hanson, E.J. Prebys, M. S. Dixit, Frans Meijers, H. Ihssen, S. W. Gensler, T. Kobayashi, C. J. Virtue, G. M. Dallavalle, J. von Krogh, Dave Robinson, L. A. del Pozo, Michael Dittmar, G. Yekutieli, A. A. Carter, S. Schreiber, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, S. Barnett, D. Hochman, N. J. Thackray, K. Stephens, J. R. McNutt, G. Quast, John Baines, D. R. Ward, G. Transtromer, J. G. Layter, and M. F. Turner
Subjects: Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Monte Carlo method, Perturbative QCD, Parton, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Parton shower, Engineering (miscellaneous), Particle Physics - Experiment, Coherence (physics)
Abstract: From a sample of 146900 hadronicZ 0 decays recorded by the OPAL detector at LEP, we have studied the azimuthal correlations of particles in hadronic events. It is expected that these correlations are sensitive to interference effects in QCD. We have compared the data to QCD Monte Carlo models which include and which do not include interference effects. We find that the distributions of azimuthal correlations are not reproduced by the parton shower models we have tested unless interference effects are included, no matter which hadronisation scheme is used.
Published: 1993

23. Measurements of $$B^0 - \bar B^0 $$ mixing, $${{\Gamma (Z^0 \to b\bar b)} \mathord{\left/ {\vphantom {{\Gamma (Z^0 \to b\bar b)} {\Gamma (Z^0 \to hadrons)}}} \right. \kern-\nulldelimiterspace} {\Gamma (Z^0 \to hadrons)}}$$ and semileptonic branching ratios forb-flavoured hadrons in hadronicZ 0 decays

Author: F. S. Merritt, Sachio Komamiya, E. Ros, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, Kiyotomo Kawagoe, H. Deng, R. Humbert, T. J. Smith, K. Stephens, Madjid Boutemeur, D. Pitman, M. H. Lehto, M. Yurko, S. A. Robins, J. R. McNutt, T. P. Kokott, A. Luig, B. Fabbro, B. Panzer-Steindel, A. Skillman, B. C. Shen, Gregor Herten, A. Gaidot, T. Wlodek, P. G. Estabrooks, M. Sproston, P. W. Jeffreys, T. G. Shears, N. Tesch, A. Dieckmann, T. Kobayashi, Norbert Wermes, Sherry Towers, P. Weber, Ehud Duchovni, R. K. Keeler, C. Wahl, A. K. Honma, W. G. Scott, B. Wilkens, T. Kawamoto, J. Steuerer, R. G. Kellogg, M. Jimack, P. Igo-Kemenes, R. Bartoldus, D. M. Gingrich, H. Ihssen, J. M. Roney, D. S. Koetke, P. M. Watkins, J. W. Gary, J. E. Pilcher, H. O. Ogren, S. Orito, H. Jeremie, W. R. Gibson, G. Quast, J. M. Lorah, M. Rosvick, John Baines, Gideon Bella, R. E. Hughes-Jones, U. Maur, Stefano Marcellini, S. W. Gensler, M. Hansroul, P. Bright-Thomas, R. Kowalewski, C. Sbarra, M. Jones, Christoph Geich-Gimbel, S. J. Hillier, R. Mir, James Letts, C. J. Virtue, P. Berlich, H. J. Burckhart, Jacqueline Batley, V. Gibson, L. Köpke, H. M. Fischer, M. J. Losty, R. J. Sobie, R.J. Akers, C. H. Shepherd-Themistocleous, A. Beck, M. A. Thomson, W. Mohr, E. Heflin, D. R. Ward, G. Transtromer, J. Kroll, R. M. Brown, D. R. Rust, E. do Couto e Silva, G. J. VanDalen, Michael Dittmar, T. Behnke, P. A. Elcombe, S. L. Lloyd, J. Mildenberger, R. J. Homer, Lorne Levinson, F. X. Gentit, J. E. Conboy, Harold Nguyen, Claude Leroy, G. G. Hanson, A. Michelini, A. C. Janissen, J. C. Clayton, G. Yekutieli, B. W. Kennedy, M. J. Oreglia, P. M. Hattersley, J. Becker, J. P. Pansart, Gilles Beaudoin, E. Torrente-Lujan, T. Hilse, P. F. Harrison, R. Yaari, Silvia Arcelli, F. Scharf, M. Tecchio, Margret Fincke-Keeler, N. I. Geddes, F. C. Grant, A. Yeaman, S. Bethke, O. Runolfsson, M. W. Redmond, A. M. Lee, G. Giacomelli, N. K. Watson, A. A. Carter, M. A. Whalley, Marco Cuffiani, R. Van Kooten, P. Mättig, P. Pfister, Erez Etzion, R. Lahmann, D. C. Imrie, C. Beeston, P. Schenk, E. Lefebvre, C. M. Hawkes, Claudio Grandi, A. Buijs, D. M. Strom, C. Stegmann, M. Cooper, Daniel Lellouch, G. N. Patrick, Gideon Alexander, Stefan Kluth, M. Hauschild, M. S. Dixit, Frans Meijers, M. Sasaki, Takehiko Mori, Paolo Capiluppi, S. L. Chu, Tohru Takeshita, M. G. Rison, F. Odorici, C. Markus, T. W. Pritchard, P. Paschievici, J. R. Carter, G. P. Siroli, J. King, Paul Kyberd, F. K. Loebinger, Christoph Schwick, P. E.L. Clarke, Shlomit Tarem, J. P. Martin, M. Morii, D. E. Plane, O. Schaile, Georges Azuelos, Peter R Hobson, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, J. F. Kral, G. D. Lafferty, P. Bentkowski, P. Routenburg, S. De Jong, G. M. Dallavalle, S. W. O'Neale, P. S. Wells, K. W. Bell, Max Weber, A. Rollnik, P. Poffenberger, R. Giacomelli, J. C. Hill, J. von Krogh, I. J. Bloodworth, J. Banks, N. J. Tresilian, John Hobbs, J. A. McKenna, D. J.P. Dumas, Terry Richard Wyatt, A. T. Watson, S. Rossberg, C. J. Oram, B. Schmitt, R. J. Barlow, H. Przysiezniak, M. Settles, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, M. Coupland, K. J. Anderson, Dave Robinson, A. M. Rossi, T. Tsukamoto, S. Levegrün, M. Fierro, R. P. Middleton, M. Foucher, S. Barnett, C. Y. Chang, J. G. Layter, M. F. Turner, G. W. Wilson, D. Karlen, L. A. del Pozo, C. Burgard, T. J. McMahon, D. Hochman, J. Schwiening, B. Boden, C. Jui, B. Poli, R. K. Carnegie, H. Mes, J. A. Wilson, J. Goldberg, I. P. Duerdoth, B. Nellen, W. Schappert, A. D. Schaile, G. Mikenberg, P. Leblanc, V. H. Winterer, H. G. Evans, M. J. Goodrick, I. Cohen, Gunter Wolf, James Pinfold, D. G. Fong, S. Wotton, J. Gascon, H. von der Schmitt, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, Andris Skuja, Tetsuro Mashimo, W. Gorn, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, J. Hart, J. D. Gillies, D. J. Miller, J. Lauber, H. Takeda, F. G. Oakham, G. A. Snow, C. P. Ward, D. L. Rees, M. J. Pearce, Horst Breuker, Shlomo Dado, X. C. Lou, D. A. Hinshaw, A. Astbury, U. Müller, A. J. Martin, C. K. Hargrove, Matthias Schröder, H. Lafoux, N. Paz-Jaoshvili, J. Allison, G. Duckeck, R. Ströhmer, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, D. Axen, A. Jawahery, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, and P. Bock
Subjects: Quark, Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Engineering (miscellaneous), Energy (signal processing), Boson, Bar (unit)
Abstract: From a sample of about 450 000 hadronicZ0 decays, measurements of the average$B^0 - \bar B^0 $ mixing parameter, χ, the branching fraction ofZ0 bosons into hadrons containing bottom quarks,${{\Gamma (Z^0 \to b\bar b)} \mathord{\left/ {\vphantom {{\Gamma (Z^0 \to b\bar b)} {\Gamma (Z^0 \to hadrons)}}} \right. \kern-\nulldelimiterspace} {\Gamma (Z^0 \to hadrons)}}$, the average semileptonic branching ratios for such hadrons,B(b→l) andB(b→c→l), and the mean scaled energy of these hadrons, 〈xE〉, are presented. The measurements were obtained using a simultaneous fit to single-lepton and dilepton events collected with the OPAL detector at LEP, including both electrons and muons. The results are where the errors are statistical and systematic, respectively, in each case. The result forB)b→c→l) excludes decays of the typeb→→l.
Published: 1993

24. Evidence for chain-like production of strange baryon pairs in jets

Author: T. P. Kokott, G. Tysarczyk-Niemeyer, F. X. Gentit, A. Beck, C. Markus, S. Komamiya, W. R. Gibson, G. G. Hanson, S. Dado, John Hobbs, A. M. Lee, F. Odorici, G. A. Snow, C. P. Ward, T. Hilse, J. Schwiening, F. S. Merritt, T. Mashimo, G. W. Wilson, H. O. Ogren, D. L. Rees, K. Stephens, D. Pitman, A. Dieckmann, J. E. Conboy, J. Kroll, S. Bethke, Tara Shears, R. M. Brown, R. J. Hemingway, S. Rossberg, H. Jeremie, Andris Skuja, S. Barnett, J. A. McKenna, H. M. Fischer, M. W. Redmond, W. Mohr, Frans Meijers, Peter R Hobson, G. Duckeck, P. Routenburg, E. Heflin, P. E.L. Clarke, A. Simon, C. Wahl, F. G. Oakham, J. Letts, G. Quast, E. Duchovni, A. Wagner, M. Morii, T. Mori, Horst Breuker, P. A. Elcombe, B. Lorazo, Otmar Biebel, G. N. Patrick, E. do Couto e Silva, M. Cooper, T. Mouthuy, J. Ludwig, A. Yeaman, J. Pinfold, P. M. Watkins, D. C. Imrie, S. Tarem, A. Gaidot, D. Menszner, M. Hansroul, H. G. Evans, T. J. McMahon, P. Weber, D. G. Charlton, D. L. Wagner, M. J. Goodrick, S. De Jong, S. Levegrün, J. Hart, Tohru Takeshita, P. Sherwood, H. M. Bosch, F. Lamarche, M. Yurko, P. Mättig, D. Hochman, W. J. Collins, P. Pfister, H. Przysiezniak, H. Deng, Harold Nguyen, N. K. Watson, P. Bentkowski, J. P. Martin, J. D. Gillies, C. Moisan, G. T. Zorn, M. Jimack, B. Panzer-Steindel, C. Jui, Richard Keeler, G. Beaudoin, T. J. Smith, M. Sasaki, P. Berlich, X. C. Lou, R. Humbert, J. Mildenberger, D. E. Plane, C. Y. Chang, S. Marcellini, J. F. Kral, G. P. Siroli, D. R. Rust, J. C. Clayton, N. Paz-Jaoshvili, P. G. Estabrooks, K. J. Anderson, P. Poffenberger, I. Cohen, C. M. Hawkes, A. Pouladdej, R. E. Hughes-Jones, M. Coupland, C. Burgard, V. Gibson, John Baines, P. Bock, O. Runolfsson, E. Ros, G. Giacomelli, Gideon Bella, J. Hagemann, R. K. Carnegie, C. Leroy, A. C. Janissen, N. I. Geddes, G. Yekutieli, G. Transtromer, M. Kuwano, U. Binder, B. C. Shen, R. Lahmann, W. Schappert, J. C. Hill, H. J. Burckhart, A. Michelini, B. Poli, Carla Sbarra, A. Jawahery, J. P. Pansart, J. R. McNutt, E. Etzion, J. Becker, U. Maur, M. Fierro, T. W. Pritchard, John Allison, R. G. Kellogg, D. S. Koetke, R. W.L. Jones, R. W. Springer, D. R. Ward, B. Boden, P. W. Jeffreys, M. F. Turner, R. Yaari, Mitsuaki Nozaki, B. W. Kennedy, S. Arcelli, V. H. Winterer, G. M. Dallavalle, S. L. Chu, P. Igo-Kemenes, J. von Krogh, P. F. Harrison, H. Mes, Dave Robinson, G. Azuelos, L. A. del Pozo, G. A. Bahan, M. Hauschild, Alan Watson, P. Kyberd, P. D. Acton, R. F. McGowan, C. K. Hargrove, J. A. Wilson, W. G. Scott, A. Rollnik, M. J. Losty, J. M. Lorah, M. Sproston, A. M. Rossi, M. Jobes, G. D. Lafferty, A. J. Martin, P. Leblanc, D. Lellouch, I. P. Duerdoth, C. H. Shepherd-Themistocleous, H. Ihssen, F. K. Loebinger, M. A. Thomson, J. G. Layter, R. Kowalewski, S. Wotton, R. Ströhmer, L. Levinson, M. Rosvick, G. Alexander, P.P. Singh, F. C. Grant, W. Gorn, P. Bright-Thomas, A. Buijs, Kiyotomo Kawagoe, D. M. Strom, C. Grandi, Tatsuo Kawamoto, O. Schaile, S. Schreiber, R. Giacomelli, K. Runge, N. J. Tresilian, B. Nellen, R. Van Kooten, D. J. Miller, M. Dittmar, J. Steuerer, T. Kobayashi, M. Fincke-Keeler, D. Karlen, J. Goldberg, D. Axen, P. Paschievici, A. K. Honma, C. J. Oram, O. Ganel, G. Vasseur, M. Weber, R. Mir, M. Settles, M. Foucher, M. J. Oreglia, T. Wlodek, P. Schenk, J. E. Pilcher, Wolfram Dietrich Zeuner, G. Maringer, N. J. Thackray, M. H. Lehto, G. J. VanDalen, E. Torrente-Lujan, Roger Barlow, M. Cuffiani, G. A. Beck, Ian J Bloodworth, A. A. Carter, G. E. Richards, A. Astbury, P. M. Hattersley, S. Orito, T. Tsukamoto, Austin Ball, A. Montanari, P. Jovanovic, J. Banks, J. R. Carter, N. Tesch, C. J. Virtue, M. A. Whalley, G. Mikenberg, T. R. Wyatt, S. W. O'Neale, L. Köpke, Stefan Kluth, J. R. Batley, R. Sobie, R. P. Middleton, C. Geich-Gimbel, P. S. Wells, R. J. Homer, R. Shypit, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, T. Behnke, J. P. Walker, D. G. Fong, J. Gascon, H. von der Schmitt, J. M. Roney, Marcello Mannelli, J. E. Duboscq, N. Wermes, P. Scharff-Hansen, P. Teixeira-Dias, B. Schmitt, J. W. Gary, A. M. Smith, D. J.P. Dumas, D. A. Hinshaw, A. D. Schaile, K. W. Bell, Stephen Lloyd, M. Tecchio, S. W. Gensler, S. J. Hillier, P. Taras, Phillip Allport, Paolo Capiluppi, C. Schwick, and M. S. Dixit
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Monte Carlo method, Hadron, Strangeness, Nuclear physics, Baryon, High Energy Physics::Experiment, Rapidity, Baryon number, Nuclear Experiment, Particle Physics - Experiment
Abstract: The production dynamics of baryon-antibaryon pairs are investigated using hadronic Z0 decays, recorded with the OPAL detector, which contain at least two identified Λ baryons. The rapidly difference for Λ Λ pairs shows the correlations expected from models with a chain-like production of baryon-antibaryon pairs. If the baryon number of a Λ is compensated by a Λ , the Λ is found with a probability of 53% in an interval of ±0.6 around the Λ rapidity. This correlation strength is weaker than predicted by the Herwig Monte Carlo and the Jetset Monte Carlo with a production chain of baryon-antibaryon, and stronger than predicted by the UCLA model. The observed rapidity correlations can be described by the Jetset Monte Carlo with a dominant production chain of baryon-meson-antibaryon, the popcorn mechanism. In addition to the short range correlations, one finds an indication of a correlation of Λ Λ pairs in opposite hemispheres if both the Λ and the Λ have large rapidities. Such long range correlations are expected if the primary quark flavours are compensated in opposite hemispheres and if these quarks are found in energetic baryons. Rates for simultaneous baryon and strangeness number compensation for Λ Λ , Ξ − Ξ + and Ξ − Λ ( Λ + Λ ) are measured and compared with different Monte Carlo models.
Published: 1993

25. A measurement of (892)± production in hadronic Z0 decays

Author: J. Steuerer, T. Kobayashi, M. Fincke-Keeler, P. D. Acton, S. Bethke, A. Astbury, P. M. Hattersley, J. Letts, G. Quast, E. Duchovni, L. Köpke, W. Mohr, D. R. Rust, P. A. Elcombe, J. Schwiening, S. J. Hillier, F. Odorici, P. Routenburg, C. Geich-Gimbel, J. Hart, R. Shypit, F. G. Oakham, S. Weisz, R. D. Heuer, Fabrizio Fabbri, Tara Shears, A. Simon, J. A. Wilson, D. Van den plas, P. Igo-Kemenes, K. Runge, E. Ros, R. M. Brown, S. Tarem, S. Levegrün, T. Mori, P. Bentkowski, T. J. McMahon, Otmar Biebel, D. G. Charlton, D. L. Wagner, N. J. Tresilian, G. Mikenberg, B. Nellen, P. S. Wells, G. Duckeck, C. M. Hawkes, A. Pouladdej, H. Przysiezniak, H. Deng, E. Torrente-Lujan, X. C. Lou, B. Poli, Tohru Takeshita, R. Humbert, S. W. O'Neale, W. Schappert, Carla Sbarra, Roger Barlow, R. J. Homer, G. G. Hanson, S. Dado, Horst Breuker, H. G. Evans, M. J. Goodrick, G. Beaudoin, S. Wotton, R. Ströhmer, D. Karlen, F. Lamarche, R. Yaari, M. H. Lehto, J. Goldberg, F. C. Grant, C. Markus, G. Giacomelli, T. Hilse, B. C. Shen, L. Levinson, W. Gorn, R. Sobie, G. N. Patrick, H. O. Ogren, S. Bougerolle, E.J. Prebys, P. Paschievici, C. J. Virtue, O. Ganel, S. Komamiya, J. F. Kral, A. M. Lee, D. Axen, D. Pitman, A. K. Honma, G. P. Siroli, N. I. Geddes, T. Wlodek, N. Tesch, Frans Meijers, P. Bright-Thomas, A. Buijs, D. M. Strom, T. P. Kokott, C. Grandi, T. R. Wyatt, S. Arcelli, S. Rossberg, H. Jeremie, M. Jimack, B. Panzer-Steindel, C. Jui, A. Dieckmann, J. E. Conboy, J. C. Hill, Tatsuo Kawamoto, M. Cooper, G. J. VanDalen, Stefan Kluth, S. Schreiber, W. J. Collins, Peter R Hobson, R. J. Hemingway, J. Banks, G. Tysarczyk-Niemeyer, F. X. Gentit, R. Mir, D. J. Miller, P. Weber, J. Kroll, C. J. Oram, F. K. Loebinger, Gideon Bella, G. Yekutieli, D. E. Plane, J. Ludwig, A. Yeaman, M. A. Thomson, E. do Couto e Silva, G. A. Snow, C. P. Ward, E. Heflin, D. L. Rees, K. Stephens, H. J. Burckhart, D. Hochman, J. Pinfold, Jacqueline Batley, Richard Keeler, C. K. Hargrove, M. J. Oreglia, P. Pfister, P. Sherwood, S. Marcellini, Ian J Bloodworth, C. Wahl, T. J. Smith, M. Cuffani, N. K. Watson, A. Beck, C. Moisan, P. M. Watkins, Alan Watson, G. Transtromer, G. Azuelos, D. J.P. Dumas, O. Runolfsson, A. Gaidot, S. Orito, F. S. Merritt, A. Rollnik, W. R. Gibson, M. Sasaki, A. Montanari, S. W. Gensler, R. K. Carnegie, C. Leroy, A. D. Schaile, J. R. Carter, John Hobbs, U. Binder, J. R. McNutt, Austin Ball, A. C. Janissen, C. Y. Chang, M. F. Turner, G. Vasseur, P. Berlich, S. De Jong, M. Weber, E. Etzion, J. Becker, U. Maur, T. Mashimo, M. J. Losty, P. Mättig, M. Sproston, M. Settles, G. A. Bahan, T. Tsukamoto, G. W. Wilson, Mitsuaki Nozaki, J. A. McKenna, J. P. Martin, M. Foucher, J. D. Gillies, J. Mildenberger, B. Lorazo, H. M. Fischer, R. E. Hughes-Jones, A. Wagner, M. Coupland, P. Schenk, B. W. Kennedy, D. C. Imrie, C. Burgard, M. A. Whalley, J. E. Pilcher, V. Gibson, V. H. Winterer, John Baines, G. M. Dallavalle, D. R. Ward, B. Boden, M. Hansroul, P. Teixeira-Dias, P. Taras, J. von Krogh, P. Poffenberger, P. F. Harrison, H. Mes, J. P. Pansart, Phillip Allport, Peter Clarke, Dave Robinson, L. A. del Pozo, M. Hauschild, J. C. Clayton, N. Paz-Jaoshvili, P. G. Estabrooks, I. Cohen, K. J. Anderson, P. Kyberd, W. G. Scott, T. W. Pritchard, John Allison, Paolo Capiluppi, C. Schwick, J. M. Lorah, A. M. Rossi, R. F. McGowan, M. S. Dixit, M. Jobes, G. D. Lafferty, Kiyotomo Kawagoe, P. Leblanc, R. G. Kellogg, D. S. Koetke, R. W.L. Jones, G. E. Richards, K. W. Bell, Stephen Lloyd, M. Tecchio, O. Schaile, D. Menszner, Harold Nguyen, R. P. Middleton, J. Hagemann, P. Bock, A. Michelini, M. Kuwano, R. Lahmann, G. Alexander, P.P. Singh, M. W. Redmond, M. Rosvick, H. M. Bosch, A. A. Carter, T. Mouthuy, G. T. Zorn, N. Wermes, P. Scharff-Hansen, B. Schmitt, J. W. Gary, A. M. Smith, M. Yurko, P. W. Jeffreys, D. A. Hinshaw, Wolfram Dietrich Zeuner, P. Jovanovic, J. P. Walker, D. G. Fong, A. Jawahery, J. Gascon, H. von der Schmitt, J. M. Roney, R. W. Springer, Marcello Mannelli, J. E. Duboscq, Andris Skuja, S. Barnett, A. J. Martin, D. Lellouch, T. Behnke, I. P. Duerdoth, C. H. Shepherd-Themistocleous, H. Ihssen, J. G. Layter, R. Kowalewski, G. Maringer, N. J. Thackray, R. Van Kooten, and M. Dittmar
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Cross section (physics), Particle physics, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Event (particle physics), Particle Physics - Experiment
Abstract: This is the post-print version of the Article - Copyright @ 1993 Elsevier. Measurements are presented of the inclusive cross section for K∗(892)± production in hadronic decays of the Z0 using a sample of about half a million events recorded with the OPAL experiment at LEP. Charged K∗ mesons are reconstructed in the decay channel K0Sπ±. A mean rate of 0.72±0.02±0.08 K∗ mesons per hadronic event is found. Comparison of the results with predictions of the JETSET and HERWIG models shows that JETSET overestimates the K∗± production cross section while HERWIG is consistent with the data. This study was supported by the Department of Energy, USA, National Science Foundation, USA, Science and Engineering Research Council, UK, Natural Sciences and Engineering Research Council, Canada, Israeli Ministry of Science, Minerva Gesellschaft, Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, American Israeli Bi-national Science Foundation, Direction des Sciences de la Matibre du Commissariat ~ l'Energie Atomique, France, Bundesministerium f'fir Forschung und Technologie, FRG, National Research Council of Canada, Canada, A.P. Sloan Foundation and Junta Nacional de Investigag~o Ciendfica e Tecnolrgica, Portugal.
Published: 1993

26. The forward-backward asymmetry of $$e^ + e^ - \to b\bar b and e^ + e^ - \to c\bar c$$ using leptons in hadronicZ 0 decays

Author: Madjid Boutemeur, Tohru Takeshita, James Pinfold, D. G. Fong, J. Gascon, H. von der Schmitt, S. L. Chu, P. G. Estabrooks, R. K. Keeler, Georges Azuelos, D. Pitman, S. Barnett, P. M. Hattersley, M. H. Lehto, P. M. Watkins, J. F. Kral, K. W. Bell, C. Y. Chang, M. F. Turner, F. Odorici, J. W. Gary, Max Weber, H. Mes, I. P. Duerdoth, R. Mir, D. Hochman, C. Sbarra, Marcello Mannelli, J. E. Duboscq, J. C. Hill, T. G. Shears, Misao Sasaki, M. Yurko, John Hobbs, Erez Etzion, Michael Dittmar, R. Lahmann, H. M. Fischer, M. J. Pearce, Horst Breuker, F. S. Merritt, G. Yekutieli, J. C. Clayton, Silvia Arcelli, Stefan Kluth, D. M. Gingrich, Shlomit Tarem, D. C. Imrie, B. C. Shen, B. Fabbro, B. Panzer-Steindel, J. G. Layter, P. W. Jeffreys, A. K. Honma, C. Moisan, P. Scharff-Hansen, M. J. Oreglia, S. Rossberg, P. Berlich, C. J. Oram, L. Köpke, G. P. Siroli, R. P. Middleton, W. G. Scott, G. Beaudoin, A. A. Carter, G. A. Beck, Christoph Schwick, Achim Stahl, J. Mildenberger, Harold Nguyen, P. Teixeira-Dias, P. E.L. Clarke, A. D. Schaile, J. Steuerer, Matthias Schröder, Gunter Wolf, Roger Jones, R. Van Kooten, P. F. Harrison, J. A. McKenna, A. M. Smith, G. Vasseur, R. Kowalewski, M. J. Losty, J. M. Lorah, D. R. Rust, Gideon Bella, H. J. Burckhart, Jacqueline Batley, H. Lafoux, N. Paz-Jaoshvili, S. Wotton, A. Michelini, J. R. Carter, G. N. Patrick, Otmar Biebel, P. D. Acton, Stephen Lloyd, A. Yeaman, G. E. Richards, D. G. Charlton, D. L. Wagner, P. Bright-Thomas, M. Tecchio, G. A. Snow, C. P. Ward, Kiyotomo Kawagoe, B. Lorazo, B. Schmitt, J. M. Roney, Andris Skuja, V. H. Winterer, A. M. Lee, M. W. Redmond, P. Igo-Kemenes, H. Jeremie, T. J. Smith, A. C. Janissen, K. Stephens, H. Deng, Margret Fincke-Keeler, N. K. Watson, J. R. McNutt, Sachio Komamiya, T. J. McMahon, R. Humbert, P. Mättig, R. Bartoldus, D. A. Hinshaw, D. L. Rees, R. Yaari, Tetsuro Mashimo, J. Goldberg, M. A. Thomson, H. O. Ogren, W. Mohr, J. Schwiening, U. Maur, B. Nellen, P. Leblanc, E. Ros, A. T. Watson, P. Weber, S. A. Robins, R. K. Carnegie, S. Bethke, Christoph Geich-Gimbel, Marco Cuffiani, A. Astbury, V. Gibson, G. Quast, J. A. Wilson, T. P. Kokott, H. G. Evans, A. Luig, U. Müller, Paul Kyberd, I. J. Bloodworth, P. Pfister, F. K. Loebinger, T. Behnke, J. Kroll, R.J. Akers, Gideon Alexander, P. S. Wells, M. J. Goodrick, Paolo Capiluppi, Norbert Wermes, W. J. Collins, Sherry Towers, John Baines, I. Cohen, T. Kawamoto, T. Hilse, A. J. Martin, P. A. Elcombe, S. W. O'Neale, F. X. Gentit, K. J. Anderson, J. E. Conboy, Randall Sobie, G. D. Lafferty, W. Schappert, O. Runolfsson, J. Banks, Ehud Duchovni, R. Shypit, S. Orito, M. Rosvick, M. Settles, A. Pouladdej, Shlomo Dado, G. Duckeck, R. Ströhmer, M. Jimack, Terry Richard Wyatt, G. T. Zorn, H. Ihssen, N. J. Tresilian, D. R. Ward, T. W. Pritchard, E. do Couto e Silva, G. Transtromer, S. W. Gensler, R. D. Heuer, A. Rollnik, R. Giacomelli, H. M. Bosch, C. K. Hargrove, Wolfram Dietrich Zeuner, M. Foucher, C. Beeston, X. C. Lou, Fabrizio Fabbri, S. J. Hillier, T. Kobayashi, M. Coupland, Claudio Grandi, C. J. Virtue, M. Morii, Peter R Hobson, P. Poffenberger, R. E. Hughes-Jones, O. Schaile, D. Axen, A. Jawahery, C. Gorn, Peter Sherwood, D. Van del Plas, J. Becker, R. W. Springer, Alexander Wagner, M. Hansroul, John Allison, G. W. Wilson, D. Karlen, J. Hagemann, J. Ludwig, Giora Mikenberg, K. Runge, J. von Krogh, P. Bock, M. Jones, C. Burgard, A. M. Rossi, T. Tsukamoto, S. Levegrün, C. M. Hawkes, G. J. VanDalen, M. Cooper, Daniel Lellouch, C. H. Shepherd-Themistocleous, Dave Robinson, R. G. Kellogg, R. J. Homer, Takehiko Mori, W. R. Gibson, L. A. del Pozo, D. S. Koetke, N. I. Geddes, Stefano Marcellini, James Letts, Claude Leroy, J. P. Pansart, B. Boden, B. Poli, C. Jui, A. Skillman, F. C. Grant, M. A. Whalley, M. Hauschild, A. Beck, A. Buijs, D. M. Strom, A. Gaidot, M. Kuwano, C. Stegmann, E. Heflin, R. M. Brown, Lorne Levinson, T. Wlodek, M. Sproston, C. Markus, H. Przysiezniak, P. Routenburg, P. Paschievici, N. Tesch, A. Dieckmann, B. W. Kennedy, M. Fierro, E. Torrente-Lujan, D. E. Plane, P. Bentkowski, G. M. Dallavalle, D. J.P. Dumas, Gregor Herten, C. Wahl, B. Wilkens, J. E. Pilcher, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, J. P. Martin, S. De Jong, J. Hart, J. D. Gillies, R. J. Barlow, D. J. Miller, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, H. Takeda, and F. G. Oakham
Subjects: Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, media_common.quotation_subject, Hadron, Asymmetry, Nuclear physics, Momentum, Engineering (miscellaneous), Energy (signal processing), Lepton, Bar (unit), media_common
Abstract: The forward-backward asymmetries of $$e^ + e^ - \to Z^0 \to b\bar b and e^ + e^ - \to Z^0 \to c\bar c$$ have been measured by the OPAL Collaboration using samples of hadronicZ 0 decays in which electron or muon candidates were observed. The asymmetries were measured simultaneously in a two parameter fit, which used the distributions of the track momentum and transverse momentum component with respect to the associated jet to distinguish lepton candidates from different sources. From a sample of 360 000 hadronic events with centre-of-mass energies within ±0.5 GeV of theZ 0 mass and mean energy 91.24. GeV, the values obtained for the $$b\bar b$$ asymmetry before and after correcting, for the effect of $$B^0 \overline {B^0 } $$ mixing, and for the $$c\bar c$$ asymmetry are, respectively: $$\begin{gathered} A_{FB}^{b,mix} = 0.070 \pm 0.014(stat) \pm 0.005(sys), \hfill \\ A_{FB}^b = 0.092 \pm 0.018(stat) \pm 0.007(sys) \hfill \\ \pm 0.003(mix), \hfill \\ A_{FB}^c = 0.014 \pm 0.030(stat) \pm 0.020(sys). \hfill \\ \end{gathered} $$ The measurement of the $$b\bar b$$ asymmetry is confirmed by a measurement using only leptons with high transverse momentum. This sample is highly enriched in semileptonic decays ofb hadrons. Measurements using high transverse momentum leptons were also performed using samples of events with centre-of-mass energies further from theZ 0 mass. After correcting for the effect of $$B^0 \overline {B^0 } $$ mixing, the results are: $$\begin{gathered} A_{FB}^b (\langle \sqrt s \rangle = 89.66GeV) \hfill \\ = 0.071 \pm 0.054(stat) \pm 0.007(sys) \pm 0.002(mix), \hfill \\ A_{FB}^b (\langle \sqrt s \rangle = 92.75GeV) \hfill \\ = 0.131 \pm 0.047(stat) \pm 0.012(sys) \pm 0.004(mix). \hfill \\ \end{gathered} $$
Published: 1993

27. Inclusive neutral vector meson production in hadronicZ 0 decays

Author: P. Igo-Kemenes, C. Moisan, J. P. Walker, J. Goldberg, P. Teixeira-Dias, G. Maringer, B. Nellen, H. Jeremie, R. E. Hughes-Jones, U. Maur, M. Hauschild, P. M. Hattersley, R. Mir, P. Leblanc, V. Gibson, J. M. Lorah, I. J. Bloodworth, D. C. Imrie, Kiyotomo Kawagoe, C. Markus, P. Paschievici, Sachio Komamiya, G. P. Siroli, Christoph Schwick, J. M. Roney, D. A. Hinshaw, P. Weber, E. Ros, H. Mes, I. P. Duerdoth, S. Schreiber, A. Astbury, T. J. McMahon, D. J. Miller, W. Mohr, B. C. Shen, H. G. Evans, E. do Couto e Silva, P. E.L. Clarke, M. J. Goodrick, I. Cohen, M. Jimack, M. Hansroul, M. Yurko, M. J. Oreglia, R. Van Kooten, P. W. Jeffreys, D. Pitman, T. P. Kokott, Carla Sbarra, John Allison, O. Ganel, A. J. Martin, J. Schwiening, R. K. Carnegie, A. K. Honma, W. G. Scott, J. Steuerer, F. G. Oakham, M. Settles, P. S. Wells, R. G. Kellogg, J. G. Layter, A. M. Lee, M. Jobes, U. Binder, A. D. Schaile, C. H. Shepherd-Themistocleous, M. F. Turner, T. Behnke, P. Scharff-Hansen, M. H. Lehto, M. Foucher, P. A. Elcombe, R. J. Homer, R. Kowalewski, Terry Richard Wyatt, J. C. Clayton, Stefano Marcellini, J. A. Wilson, James Letts, Margret Fincke-Keeler, M. Coupland, G. A. Snow, C. P. Ward, D. L. Rees, J. Becker, T. Mouthuy, G. N. Patrick, F. S. Merritt, Paul Kyberd, O. Schaile, G. W. Wilson, S. Wotton, W. Schappert, F. K. Loebinger, D. Axen, A. Jawahery, M. J. Losty, A. Skuja, D. Karlen, A. Simon, Otmar Biebel, J. Hart, A. M. Smith, V. H. Winterer, M. W. Redmond, G. T. Zorn, G. Tysarczyk-Niemeyer, G. E. Richards, D. G. Charlton, D. L. Wagner, R. Yaari, G. Vasseur, P. Pfister, C. M. Hawkes, M. Cooper, Daniel Lellouch, S. Bethke, Marco Cuffiani, P. Poffenberger, Richard Keeler, G. Beaudoin, J. D. Gillies, J. P. Martin, C. K. Hargrove, M. Manelli, H. Deng, R. Humbert, Peter Sherwood, B. Lorazo, R. W. Springer, Alexander Wagner, A. Rollnik, A. M. Rossi, P. Berlich, L. Köpke, Takehiko Mori, R. J. Barlow, M. Morii, Michael Dittmar, J. Hagemann, J. Ludwig, H. Przysiezniak, G. J. Van Dalen, G. Yekutieli, K. Runge, P. Bock, S. De Jong, Peter R Hobson, D. R. Rust, Tetsuro Mashimo, T. Tsukamoto, P. Lennert, S. Levegrün, A. Gaidot, M. Kuwano, T. Wlodek, K. Stephens, Claude Leroy, Tohru Takeshita, Shlomo Dado, J. R. McNutt, M. Sproston, J. P. Pansart, T. Kawamoto, J. A. McKenna, F. Lamarche, F. Odorici, N. Paz-Jaoshvili, C. Wahl, W. J. Collins, Erez Etzion, P. Routenburg, F. C. Grant, M. A. Whalley, R. J. Hemingway, A. A. Carter, Randall Sobie, G. D. Lafferty, J. Mildenberger, N. Tesch, A. Dieckmann, C. P. Howarth, T. Hilse, Harold Nguyen, X. C. Lou, S. Orito, Stefan Kluth, M. Rosvick, Shlomit Tarem, P. Jovanovic, R. F. McGowan, Austin Ball, O. Runolfsson, D. Menszner, G. Duckeck, R. Ströhmer, Georges Azuelos, J. E. Pilcher, G. Quast, John Baines, A. Buijs, D. M. Strom, S. Rossberg, W. Gorn, Alessandro Montanari, John Hobbs, Giora Mikenberg, H. O. Ogren, Claudio Grandi, C. J. Oram, G. A. Bahan, Tara Shears, J. F. Kral, K. W. Bell, S. W. O'Neale, D. R. Ward, C. Y. Chang, G. Transtromer, T. W. Pritchard, H. M. Bosch, R. P. Middleton, Christoph Geich-Gimbel, Max Weber, T. J. Smith, A. Yeaman, N. K. Watson, J. Banks, Wolfram Dietrich Zeuner, G. G. Hanson, N. J. Tresilian, P. Taras, J. C. Hill, Misao Sasaki, S. Weisz, R. D. Heuer, Mitsuaki Nozaki, D. G. Fong, Fabrizio Fabbri, P. Mättig, J. Kroll, Horst Breuker, D. Van den plas, J. Gascon, S. Barnett, G. Giacomelli, H. von der Schmitt, N. J. Thackray, E.J. Prebys, F. X. Gentit, J. von Krogh, J. E. Conboy, J. W. Gary, M. S. Dixit, Frans Meijers, J. E. Duboscq, Dave Robinson, L. A. del Pozo, A. Pouladdej, K. J. Anderson, C. Jui, N. I. Geddes, B. Boden, B. Poli, H. M. Fischer, A. Michelini, A. C. Janissen, J. R. Carter, D. Hochmann, Silvia Arcelli, Phillip Allport, P. Singh, Gideon Alexander, Paolo Capiluppi, P. Schenk, R. W. L. Jones, N. Wermes, Ehud Duchovni, R. Shypit, P. Le Du, B. Panzer-Steindel, H. Ihssen, S. W. Gensler, T. Kobayashi, C. J. Virtue, P. G. Estabrooks, Gideon Bella, H. J. Burckhart, Jacqueline Batley, P. M. Watkins, P. F. Harrison, P. D. Acton, Stephen Lloyd, M. Tecchio, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, S. Bougerolle, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, and B. W. Kennedy
Subjects: Physics, Particle physics, Meson production, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Monte Carlo method, Nuclear physics, Pion, Mass spectrum, High Energy Physics::Experiment, Neutral vector, Ionization energy, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Results are reported of a study of neutral vector meson production in multihadronicZ0 decays in the OPAL experiment at LEP. Pions and kaons have been identified by specific ionisation energy loss andK±π∓ andK+K− mass spectra have been fitted, in bins of the scaled momentum variablexp, to combinations of resonance signals and non-resonant backgrounds. Rates are given forK*(892)° and o(1020), and production cross sections are compared to the predictions of Monte Carlo models. Overall multiplicities have been determined as 0.76±0.07±0.06K*(892)° and 0.086±0.015±0.010 o(1020) per hadronicZ0 decay (the quoted errors are respectively statistical and systematic). Momentum dependent distortions of the ππ mass spectra, possibly associated indirectly with Bose-Einstein effects, have prevented reliable measurement of the ρ(770)° cross section in this study.
Published: 1992

28. A study of charged particle multiplicities in hadronic decays of theZ 0

Author: W. R. Gibson, C. Ho, R. Mir, H. Mes, A. Beck, H. Oh, E. Heflin, Margret Fincke-Keeler, I. P. Duerdoth, R. M. Brown, Lorne Levinson, B. W. Kennedy, K. J. Anderson, S. Bougerolle, F. Lamarche, R. J. Hemingway, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, M. Jobes, K. Stephens, J. R. McNutt, N. C. Wood, M. Jimack, John Allison, J. Goldberg, P. Jovanovic, Austin Ball, D. Menszner, F. Odorici, U. Binder, G. A. Snow, C. P. Ward, P. Pfister, J. P. Martin, M. W. Moss, P. M. Hattersley, M. J. Oreglia, J. R. Carter, G. N. Patrick, Silvia Arcelli, C. Fukunaga, P. Scharff-Hansen, W. J. Larson, R. G. Kellogg, B. Holl, I. Zacharov, Horst Breuker, B. Nellen, Alessandro Montanari, P. A. Elcombe, D. J. Miller, O. Runolfsson, V. Gibson, G. Quast, S. De Jong, John Baines, P. Leblanc, A. Astbury, D. C. Imrie, S. Wotton, Phillip Allport, G. Beaudoin, John Hobbs, Stefano Marcellini, J. Banks, P. Igo-Kemenes, T. Mouthuy, A. M. Smith, O. Ganel, James Letts, M. Weymann, G. Maringer, H. Jeremie, A. J. Martin, J. L. Pinfold, Tohru Takeshita, R. E. Hughes-Jones, U. Maur, A. Simon, G. P. Siroli, P. S. Wells, M. Hauschild, D. R. Ward, Shlomo Dado, G. Vasseur, D. L. Rees, B. Lorazo, M. Hansroul, H. E. Stier, Claudio Grandi, F. S. Merritt, K. Riles, G. Transtromer, J. Becker, P. G. Estabrooks, G. T. Zorn, A. M. Rossi, S. Levegrün, M. Yurko, S. Weisz, R. D. Heuer, Fabrizio Fabbri, M. J. Goodrick, Otmar Biebel, D. G. Charlton, P. Paschievici, C. J. Virtue, Terry Richard Wyatt, M. Coupland, P. Debu, I. Cohen, J. Mildenberger, Harold Nguyen, N. K. Watson, B. B. Brabson, P. W. Jeffreys, D. Van den plas, C. K. Hargrove, X. C. Lou, Gideon Alexander, N. I. Geddes, P. E.L. Clarke, D. G. Fong, M. Couch, Richard Keeler, Paolo Capiluppi, P. Schenk, A. M. Lee, B. Boden, J. Gascon, Georges Azuelos, P. M. Watkins, B. Poli, H. von der Schmitt, H. Takeda, Claude Leroy, G. Eckerlin, Giora Mikenberg, J. P. Pansart, G. J. VanDalen, J. von Krogh, D. R. Rust, N. Wermes, H. M. Fischer, A. Michelini, F. C. Grant, J. A. McKenna, R. Humbert, M. A. Whalley, B. P. O'Neill, J. F. Kral, F. G. Oakham, A. C. Janissen, K. W. Bell, J. W. Gary, R. J. Homer, Ehud Duchovni, R. Shypit, P. Lennert, Max Weber, I. Wingerter, Marcello Mannelli, S. A. Robins, R. F. McGowan, D. E. Klem, P. Ashton, A. Buijs, Andris Skuja, J. C. Hill, H. Ihssen, H. O. Ogren, Dave Robinson, M. F. Turner, Christoph Geich-Gimbel, Kiyotomo Kawagoe, Misao Sasaki, B. C. Shen, Gideon Bella, Tetsuro Mashimo, P. Poffenberger, S. W. O'Neale, Peter R Hobson, S. W. Gensler, J. D. Gillies, Paul Kyberd, F. K. Loebinger, L. A. del Pozo, A. K. Honma, M. M. Deninno, W. G. Scott, J. Kroll, C. Moisan, H. J. Burckhart, O. Schaile, J. P. Walker, R. Yaari, T. Kobayashi, Jacqueline Batley, R. Van Kooten, D. Pitman, F. X. Gentit, Sachio Komamiya, T. Kawamoto, J. E. Conboy, M. H. Lehto, E. Ros, S. Bethke, Michael Dittmar, M. Ogg, R. Kowalewski, P. Teixeira-Dias, R. J. Barlow, W. Gorn, M. W. Redmond, Marco Cuffiani, G. Yekutieli, J. M. Roney, A. Pouladdej, W. J. Collins, Randall Sobie, S. Orito, M. Rosvick, G. A. Bahan, A. Rollnik, G. G. Hanson, A. A. Carter, A. Gaidot, D. Hochman, N. J. Thackray, G. D. Lafferty, M. Kuwano, P. Weber, T. P. Kokott, Rene Brun, M. J. Losty, J. Hart, M. Sproston, S. J. Pawley, C. Y. Chang, P. Berlich, Claus Kleinwort, L. Köpke, T. W. Pritchard, H. Tsukamoto, P. Routenburg, P. Taras, Mitsuaki Nozaki, C. Wahl, S. Schreiber, G. Giacomelli, Y. Yang, T. J. McMahon, A. Dieckmann, J. Schwiening, C. P. Howarth, P. F. Harrison, P. Singh, R. K. Carnegie, H. Przysiezniak, J. E. Pilcher, J. A. Wilson, P. D. Acton, Stephen Lloyd, R. W. L. Jones, E.J. Prebys, A. D. Schaile, W. Schappert, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, M. S. Dixit, Frans Meijers, V. H. Winterer, S. R. Hou, J. M. Lorah, W. Mohr, J. G. Layter, G. Duckeck, R. Ströhmer, D. Strom, S. Sanghera, H. M. Bosch, Wolfram Dietrich Zeuner, D. A. Hinshaw, T. Behnke, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, I. J. Bloodworth, M. Settles, G. W. Wilson, D. Karlen, T. J. Smith, P. Mättig, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, Erez Etzion, Gareth J. Barker, Shlomit Tarem, S. Rossberg, C. J. Oram, and R. P. Middleton
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Multiplicity (mathematics), Charged particle, Sphericity, Nuclear physics, Log-normal distribution, Gamma distribution, High Energy Physics::Experiment, Parton shower, Engineering (miscellaneous)
Abstract: We present an analysis of multiplicity distributions of charged particles produced inZ 0 hadronic decays. The results are based on the analysis of 82941 events collected within 100 MeV of theZ 0 peak energy with the OPAL detector at LEP. The charged particle multiplicity distribution, corrected for initial-state radiation and for detector acceptance and resolution, was found to have a mean 〈n ch〉=21.40±0.02(stat.)±0.43(syst.) and a dispersionD=6.49±0.02(stat.)±0.20(syst.). The shape is well described by the Lognormal and Gamma distributions. A negative binomial parameterisation was found to describe the shape of the multiplicity distribution less well. A comparison with results obtained at lower energies confirms the validity of KNO(-G) scaling up to LEP energies. A separate analysis of events with low sphericity, typically associated with two-jet final states, shows the presence of features expected for models based on a stochastic production mechanism for particles. In all cases, the features observed in the data are well described by the Lund parton shower model JETSET.
Published: 1992

29. A measurement of strange baryon production in hadronic Z0 decays

Author: P. Paschievici, D. Karlen, A. Dieckmann, R. Mir, G. P. Siroli, A. Astbury, R. Van Kooten, C. H. Shepherd-Themistocleous, M. Hansroul, T. W. Pritchard, A. Wagner, John Hill, Silvia Arcelli, B. Boden, D. Menszner, T. Mouthuy, Gideon Bella, G. Vasseur, S. De Jong, J. C. Clayton, H. J. Burckhart, Jacqueline Batley, C. Geich-Gimbel, S. Rossberg, D. J. Miller, R. K. Carnegie, P. S. Wells, P. E.L. Clarke, Terry Richard Wyatt, F. G. Oakham, G. T. Zorn, T. Hilse, L. Levinson, R. J. Homer, Kiyotomo Kawagoe, A. Beck, H. G. Evans, John Hobbs, Tohru Takeshita, M. Fincke-Keeler, M. J. Oreglia, F. C. Grant, T. Wlodek, M. A. Whalley, A. M. Rossi, T. Tsukamoto, P. Schenk, M. J. Goodrick, N. Tesch, A. K. Honma, F. S. Merritt, R. Humbert, C. J. Virtue, Sachio Komamiya, W. Mohr, A. Buijs, D. M. Strom, G. N. Patrick, J. Mildenberger, C. Schwick, Richard Keeler, D. Hochman, J. P. Martin, P. Routenburg, O. Ganel, E. Ros, J. P. Walker, K. Runge, M. J. Losty, A. C. Janissen, C. J. Oram, U. Binder, J. M. Roney, J. R. Carter, A. Simon, M. Cooper, A. Rollnik, P. Singh, J. F. Kral, G. Beaudoin, J. A. McKenna, N. Wermes, P. Pfister, B. Poli, R. M. Brown, P. W. Jeffreys, J. Hart, J. Becker, K. J. Anderson, P. Weber, A. J. Martin, Carla Sbarra, X. C. Lou, A. A. Carter, T. P. Kokott, K. Stephens, R. F. McGowan, A. Yeaman, G. E. Richards, C. K. Hargrove, T. Behnke, Misao Sasaki, E. Heflin, J. P. Pansart, A. Michelini, D. A. Hinshaw, C. Markus, Marco Cuffiani, H. O. Ogren, D. G. Charlton, D. L. Wagner, D. Lellouch, C. Y. Chang, I. J. Bloodworth, C. Moisan, P. Berlich, B. C. Shen, G. Tysarczyk-Niemeyer, P. M. Watkins, P. Igo-Kemenes, H. Deng, Harold Nguyen, H. Ihssen, P. Bock, V. Gibson, Mitsuaki Nozaki, R. E. Hughes-Jones, J. G. Layter, A. Gaidot, James D Gillies, S. Wotton, Stefan Kluth, D. J.P. Dumas, R. Kowalewski, J. Kroll, P. Le Du, John Baines, S. Schreiber, S. Bethke, J. Schwiening, B. W. Kennedy, Tara Shears, F. X. Gentit, N. I. Geddes, V. H. Winterer, J. E. Conboy, Richard J Hemingway, B. Panzer-Steindel, M. Settles, G. Duckeck, M. Coupland, P. D. Acton, M. Morii, T. Kawamoto, S. W. O'Neale, Peter R Hobson, H. Mes, O. Runolfsson, P. Lennert, U. Maur, M. Foucher, R. J. Barlow, C. Jui, D. Pitman, Horst Breuker, P. M. Hattersley, P. Poffenberger, S. Orito, C. Wahl, E. do Couto e Silva, P. Mättig, D. R. Ward, P. Teixeira-Dias, M. F. Turner, G. A. Snow, C. P. Ward, G. W. Wilson, M. Hauschild, I. P. Duerdoth, F. Lamarche, H. M. Bosch, D. C. Imrie, C. Leroy, J. Steuerer, G. G. Hanson, G. Alexander, S. Bougerolle, J. Hagemann, H. Przysiezniak, E. Etzion, B. Lorazo, G. Quast, P. Leblanc, G. Giacomelli, J. Goldberg, Wolfram Dietrich Zeuner, E.J. Prebys, R. Ströhmer, Claudio Grandi, T. J. Smith, W. J. Collins, S. Dado, N. K. Watson, F. K. Loebinger, G. D. Lafferty, D. Axen, Frans Meijers, J. M. Lorah, A. Jawahery, B. Nellen, D. E. Plane, C. M. Hawkes, Peter Sherwood, W. R. Gibson, Stephen Hillier, G. M. Dallavalle, R. W. Springer, A. M. Lee, Takehiko Mori, J. R. McNutt, K. W. Bell, R. P. Middleton, M. Weber, J. Ludwig, C. P. Howarth, M. W. Redmond, A. Pouladdej, J. Gascon, Alan Watson, P. G. Estabrooks, J. E. Pilcher, G. Mikenberg, G. Maringer, S. Barnett, R. Yaari, S. Tarem, O. Biebel, M. Jimack, N. J. Thackray, John Allison, A. D. Schaile, P. Jovanovic, P. A. Elcombe, R. G. Kellogg, Austin Ball, W. Schappert, F. Odorici, Stefano Marcellini, Alessandro Montanari, James Letts, D. L. Rees, G. J. VanDalen, N. Paz-Jaoshvili, M. Kuwano, G. Transtromer, W. G. Scott, P. F. Harrison, Stephen Lloyd, M. Tecchio, M. Yurko, R. Shypit, S. W. Gensler, T. Kobayashi, D. G. Fong, H. von der Schmitt, Phillip Allport, R. Sobie, H. Jeremie, J. W. Gary, Marcello Mannelli, J. E. Duboscq, M. Jobes, P. Kyberd, Paolo Capiluppi, P. Scharff-Hansen, A. M. Smith, Andris Skuja, Tetsuro Mashimo, W. Gorn, G. Yekutieli, M. Rosvick, G. A. Bahan, R. W.L. Jones, J. von Krogh, Dave Robinson, L. A. del Pozo, Michael Dittmar, H. M. Fischer, T. J. McMahon, O. Schaile, M. H. Lehto, E. Duchovni, J. A. Wilson, S. Levegrün, L. Köpke, I. Cohen, M. S. Dixit, J. Banks, G. Azuelos, N. J. Tresilian, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, D. R. Rust, M. Sproston, and P. Taras
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Octet, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, OPAL detector, Baryon, Nuclear physics, Momentum, Diquark, QCD predictions, High Energy Physics::Experiment, Strange baryons, Particle Physics - Experiment, Spin-½
Abstract: The production of the octet and decuplet baryons Λ, Ξ − , Σ (1385) ± , Ξ(1530) 0 and Ω − and the corresponding antibaryons has been measured in a sample of 485 000 hadronic Z 0 decays. Results on differential and integrated cross sections are presented. The differential cross section of Λ baryons is found to be softer than the one predicted by the Jetset and Herwig Monte Carlo generators. The measured decuplet yields are found to disagree with the simple diquark picture where only one tuning parameter for spin 1 diquarks is used. Comparisons of the momentum spectra for Λ and Ξ − with the predictions of an analytical QCD formula are also presented.
Published: 1992

30. A study of two-particle momentum correlations in hadronic Z0 decays

Author: M. Jimack, P. Igo-Kemenes, G. Maringer, Shlomo Dado, John Allison, H. Jeremie, D. J. Miller, F. Lamarche, R. J. Hemingway, D. E. Klem, Michael Dittmar, G. Yekutieli, P. S. Wells, A. A. Carter, R. E. Hughes-Jones, U. Maur, Terry Richard Wyatt, I. J. Bloodworth, X. C. Lou, R. G. Kellogg, P. Jovanovic, Horst Breuker, Erez Etzion, H. Mes, M. Coupland, Austin Ball, D. Menszner, F. C. Grant, P. G. Estabrooks, D. R. Rust, R. Mir, I. P. Duerdoth, M. A. Whalley, Stefano Marcellini, Gareth J. Barker, M. Settles, B. C. Shen, K. J. Anderson, Gideon Bella, Giora Mikenberg, Shlomit Tarem, P. E.L. Clarke, H. Oh, E. do Couto e Silva, Alessandro Montanari, James Letts, W. J. Collins, K. Stephens, J. Steuerer, A. K. Honma, P. Lennert, H. J. Burckhart, Randall Sobie, G. D. Lafferty, S. Rossberg, W. G. Scott, A. Buijs, C. Y. Chang, Jacqueline Batley, C. J. Oram, P. M. Watkins, H. O. Ogren, J. R. McNutt, M. Yurko, P. M. Hattersley, W. R. Gibson, P. Taras, Christoph Geich-Gimbel, T. W. Pritchard, G. W. Wilson, R. P. Middleton, N. I. Geddes, R. Kowalewski, J. Mildenberger, Harold Nguyen, D. Karlen, M. Hauschild, Glenn Patrick, P. W. Jeffreys, A. M. Lee, E. Ros, M. J. Oreglia, P. Paschievici, Kiyotomo Kawagoe, M. Hansroul, H. Takeda, M. M. Deninno, J. Goldberg, B. Boden, D. Axen, M. J. Losty, B. Nellen, F. G. Oakham, G. A. Snow, C. P. Ward, Silvia Arcelli, A. Jawahery, J. Kroll, B. Poli, N. Paz-Jaoshvili, P. Leblanc, J. M. Roney, Paul Kyberd, F. K. Loebinger, A. Beck, P. F. Harrison, T. J. Smith, J. Hart, F. X. Gentit, E. Heflin, G. Tysarczyk-Niemeyer, Richard Keeler, R. Yaari, J. E. Conboy, P. Weber, M. F. Turner, S. Bethke, A. D. Schaile, V. Gibson, Peter Sherwood, J. R. Carter, P. Poffenberger, G. Quast, M. Ogg, P. D. Acton, Stephen Lloyd, M. W. Redmond, Marco Cuffiani, H. G. Evans, J. Banks, J. P. Pansart, P. Mättig, R. M. Brown, Lorne Levinson, J. D. Gillies, A. Rollnik, A. Simon, D. G. Fong, Otmar Biebel, G. E. Richards, M. J. Goodrick, I. Cohen, N. J. Tresilian, J. G. Layter, John Baines, N. Wermes, A. Pouladdej, R. W. Springer, Alexander Wagner, Tohru Takeshita, V. H. Winterer, T. Mouthuy, S. Weisz, R. D. Heuer, D. G. Charlton, D. L. Wagner, J. Gascon, C. M. Hawkes, H. von der Schmitt, M. Cooper, P. Singh, Claude Leroy, B. W. Kennedy, Fabrizio Fabbri, M. Couch, Ehud Duchovni, R. Shypit, Daniel Lellouch, J. Hagemann, D. Van den plas, J. Ludwig, R. J. Barlow, D. C. Imrie, K. Runge, P. Bock, Takehiko Mori, S. R. Hou, C. Wahl, A. Astbury, T. P. Kokott, Rene Brun, Carla Sbarra, F. S. Merritt, H. Ihssen, R. J. Homer, R. Van Kooten, Georges Azuelos, D. Pitman, R. W. L. Jones, D. R. Ward, R. Humbert, M. H. Lehto, G. Transtromer, C. P. Howarth, S. W. Gensler, J. F. Kral, G. P. Siroli, K. W. Bell, P. Le Du, D. A. Hinshaw, Christoph Schwick, S. Wotton, T. Kobayashi, C. J. Virtue, Max Weber, C. Fukunaga, B. Panzer-Steindel, O. Ganel, J. E. Pilcher, S. Bougerolle, John Hobbs, Misao Sasaki, J. A. McKenna, A. M. Rossi, F. Odorici, T. Tsukamoto, T. Behnke, Phillip Allport, S. Sanghera, S. Levegrün, H. M. Fischer, R. F. McGowan, A. J. Martin, A. Michelini, A. C. Janissen, J. W. Gary, C. Moisan, J. P. Walker, G. Duckeck, R. Ströhmer, S. A. Robins, O. Runolfsson, D. Strom, P. Teixeira-Dias, D. E. Plane, G. T. Zorn, Marcello Mannelli, J. E. Duboscq, Stephen Hillier, P. Berlich, L. Köpke, H. M. Bosch, Wolfram Dietrich Zeuner, G. M. Dallavalle, K. Riles, Andris Skuja, J. P. Martin, T. Kawamoto, Gideon Alexander, Paolo Capiluppi, P. Schenk, S. Barnett, Alan Watson, D. J.P. Dumas, D. Hochman, N. J. Thackray, John Hill, Tetsuro Mashimo, C. K. Hargrove, S. De Jong, S. Orito, Claudio Grandi, M. Rosvick, W. Gorn, Margret Fincke-Keeler, G. A. Bahan, M. Jobes, U. Binder, P. Scharff-Hansen, H. Przysiezniak, P. Pfister, G. G. Hanson, A. M. Smith, G. Vasseur, B. Lorazo, G. Giacomelli, N. K. Watson, E.J. Prebys, M. S. Dixit, S. Komamiya, Frans Meijers, S. W. O'Neale, Peter R Hobson, J. M. Lorah, W. Mohr, A. Gaidot, M. Kuwano, T. Wlodek, M. Sproston, P. Routenburg, N. Tesch, A. Dieckmann, P. A. Elcombe, D. L. Rees, J. Becker, G. J. VanDalen, S. Schreiber, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, J. von Krogh, Dave Robinson, L. A. del Pozo, and G. Beaudoin
Subjects: Physics, Quantum chromodynamics, Nuclear and High Energy Physics, Particle physics, Logarithm, High Energy Physics::Phenomenology, Monte Carlo method, Hadron, String (physics), Hadronization, Nuclear physics, Momentum, High Energy Physics::Experiment, Parton shower, Particle Physics - Experiment
Abstract: We report on a measurement of two-particle momentum correlations in hadronic decays of the Z 0 at LEP. These data are compared with recent analytic QCD calculations based on the summation of leading and next-to-leading logarithms, and with QCD Monte Carlo simulations. We find that the analytic calculations show the same general features as the data, but that the overall level of the correlations is not reproduced, suggesting that higher order or hadronization effects are significant. This contrasts with the success of similar QCD calculations in describing single-particle momentum distributions. QCD Monte Carlo models are found to give a reasonable level of correlation, with parton shower models incorporating string hadronization giving the best description of the data.
Published: 1992

31. A measurement of electron production in hadronicZ 0 decays and a determination of $$\Gamma (Z^0 \to b\bar b)$$

Author: A. Simon, Otmar Biebel, D. G. Charlton, D. L. Wagner, M. Couch, M. Hansroul, P. G. Estabrooks, R. K. Keeler, R. Humbert, Gideon Bella, H. J. Burckhart, D. Hochman, N. J. Thackray, J. Goldberg, Jacqueline Batley, A. Gaidot, B. Nellen, R. J. Homer, P. M. Watkins, P. Leblanc, P. E.L. Clarke, M. Kuwano, T. Wlodek, M. Sproston, W. J. Collins, Randall Sobie, T. Kawamoto, G. D. Lafferty, P. Routenburg, H. G. Evans, T. W. Pritchard, A. Dieckmann, T. Mouthuy, I. Wingerter, M. J. Goodrick, I. Cohen, A. Astbury, S. Orito, M. Rosvick, C. Fukunaga, S. Bougerolle, J. Hart, A. D. Schaile, C. Moisan, J. P. Walker, O. Ganel, A. J. Martin, Silvia Arcelli, V. H. Winterer, J. M. Lorah, Sachio Komamiya, P. Igo-Kemenes, G. Maringer, P. Teixeira-Dias, W. Mohr, A. M. Rossi, S. R. Hou, K. Riles, R. Mir, H. Jeremie, H. Oh, T. Tsukamoto, S. Levegrün, D. E. Klem, R. E. Hughes-Jones, U. Maur, J. von Krogh, W. R. Gibson, C. Ho, B. P. O'Neill, E. Ros, A. T. Watson, C. K. Hargrove, R. Yaari, R. Van Kooten, S. Wotton, P. Singh, Y. Yang, Margret Fincke-Keeler, P. Ashton, N. I. Geddes, A. Beck, S. Bethke, Marco Cuffiani, D. Pitman, P. A. Elcombe, E. Heflin, M. J. Oreglia, Dave Robinson, R. M. Brown, M. I. Losty, Lorne Levinson, P. F. Harrison, R. W. L. Jones, B. Boden, L. A. del Pozo, M. F. Turner, H. Mes, B. Poli, M. H. Lehto, P. Poffenberger, P. Pfister, P. D. Acton, Stephen Lloyd, K. Stephens, B. B. Brabson, J. R. McNutt, Horst Breuker, B. W. Kennedy, T. P. Kokott, Rene Brun, D. L. Rees, J. Becker, J. R. Carter, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, D. G. Fong, B. C. Shen, J. Gascon, H. von der Schmitt, Erez Etzion, Phillip Allport, G. J. VanDalen, G. N. Patrick, Michael Dittmar, G. Yekutieli, I. P. Duerdoth, Gareth J. Barker, V. Gibson, G. Quast, Shlomit Tarem, H. M. Fischer, A. Michelini, A. C. Janissen, John Baines, D. E. Plane, S. Rossberg, C. J. Oram, A. K. Honma, A. A. Carter, Stephen Hillier, G. M. Dallavalle, S. A. Robins, R. P. Middleton, D. R. Ward, M. W. Moss, G. Transtromer, W. G. Scott, D. J.P. Dumas, Gideon Alexander, Paolo Capiluppi, P. Schenk, J. W. Gary, P. M. Hattersley, S. J. Pawley, Marcello Mannelli, S. Schreiber, Andris Skuja, C. Wahl, P. Berlich, L. Köpke, T. J. McMahon, C. Y. Chang, D. R. Rust, J. Schwiening, R. K. Carnegie, John Hobbs, N. Wermes, C. P. Howarth, Ehud Duchovni, R. Shypit, S. W. O'Neale, Peter R Hobson, P. Taras, R. Kowalewski, Tetsuro Mashimo, J. A. Wilson, P. Lennert, H. Ihssen, G. Beaudoin, W. Schappert, S. W. Gensler, E. do Conto el Silva, T. Kobayashi, W. Gorn, Shlomo Dado, J. E. Pilcher, H. Takeda, F. Odirici, J. Banks, S. Weisz, R. D. Heuer, N. K. Watson, Fabrizio Fabbri, D. Van den plas, F. G. Oakham, G. A. Bahan, M. Jobes, U. Binder, Claude Leroy, P. Scharff-Hansen, W. J. Larson, D. C. Imrie, M. Hauschild, F. Lamarche, G. P. Siroli, R. J. Hemingway, J. P. Pansart, X. C. Lou, P. Paschievici, A. M. Smith, G. Vasseur, B. Lorazo, P. Jovanovic, Austin Ball, Tohru Takeshita, D. Menszner, Alessandro Montanari, Giora Mikenberg, Kiyotomo Kawagoe, Georges Azuelos, J. F. Kral, K. J. Anderson, K. W. Bell, J. D. Gillies, P. S. Wells, C. J. Virtue, R. J. Barlow, Max Weber, Terry Richard Wyatt, J. M. Roney, P. Weber, D. J. Miller, J. C. Hill, Misao Sasaki, O. Schaile, M. Coupland, F. C. Grant, M. A. Whalley, N. C. Wood, A. Buijs, G. A. Snow, C. P. Ward, G. Duckeck, R. Ströhmer, D. Strom, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, C. M. Hawkes, M. Cooper, Daniel Lellouch, D. A. Hinshaw, T. Behnke, Takehiko Mori, M. Yurko, P. W. Jeffreys, A. M. Lee, T. J. Smith, O. Runolfsson, P. Mättig, Claudio Grandi, I. J. Bloodworth, M. Settles, H. Przysiezniak, G. W. Wilson, D. Karlen, F. S. Merritt, J. A. McKenna, R. F. McGowan, H. O. Ogren, Christoph Geich-Gimbel, M. M. Deninno, J. Kroll, F. X. Gentit, J. E. Conboy, M. Ogg, J. Mildenberger, Harold Nguyen, A. Pouladdej, Paul Kyberd, F. K. Loebinger, M. W. Redmond, A. Rollnik, M. Jimack, John Allison, R. G. Kellogg, Stefano Marcellini, James Letts, G. G. Hanson, G. Giacomelli, E.J. Prebys, M. S. Dixit, Frans Meijers, J. G. Layter, S. Sanghera, J. P. Martin, S. De Jong, and P. Debu
Subjects: Physics, Quark, Semileptonic decay, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electron, Nuclear physics, Transverse plane, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Production rate
Abstract: The production rate of electrons with momentump>4 GeV/c and large momentum transverse to the jet containing the electron has been measured in 136000 hadronic decays of theZ 0 recorded with the OPAL detector at LEP in 1990. The dominant source of these electrons is the semileptonic decay of hadrons containingb quarks. If we assume that the semileptonic branching fraction ofb hadrons produced on theZ 0 resonance is the same as the branching fraction measured at the ϒ(4S) resonance, we determine $$\Gamma _{b\bar b} = 394 \pm 13 \pm 32$$ MeV, where the first error is statistical and the second error is systematic. The sensitivity of the result to this assumption is discussed. We have reduced the dependence of our result on the model ofb hadron semileptonic decay by taking into account the correlation between the model dependence of the branching fractions measured at the ϒ(4S) and of our kinematic acceptance for electrons.
Published: 1992

32. Evidence for b-flavoured baryon production in Z0 decays at LEP

Author: J. Allison, G. Duckeck, R. Ströhmer, D. Strom, G. T. Zorn, G. G. Hanson, A. Astbury, C. Y. Chang, M. Yurko, P. W. Jeffreys, F. S. Merritt, B. C. Shen, H. M. Bosch, Wolfram Dietrich Zeuner, H. M. Fischer, J. Hart, P. Taras, O. Ganel, D. C. Imrie, A. M. Lee, Margret Fincke-Keeler, A. K. Honma, W. G. Scott, J. von Krogh, A. J. Martin, J. A. McKenna, P. G. Estabrooks, R. K. Keeler, A. Michelini, A. C. Janissen, G. Giacomelli, R. F. McGowan, R. Kowalewski, H. O. Ogren, Christoph Geich-Gimbel, E.J. Prebys, M. M. Deninno, J. Kroll, F. X. Gentit, J. E. Conboy, M. Ogg, P. Ashton, A. Pouladdej, K. Riles, P. Pfister, G. Beaudoin, G. P. Siroli, Dave Robinson, L. A. del Pozo, Y. Yang, R. Van Kooten, M. S. Dixit, Frans Meijers, R. Mir, S. A. Robins, D. Pitman, C. K. Hargrove, P. M. Watkins, H. Mes, H. Oh, P. F. Harrison, M. J. Losty, I. P. Duerdoth, M. H. Lehto, J. M. Lorah, Shlomo Dado, P. D. Acton, Stephen Lloyd, D. A. Hinshaw, Michael Dittmar, P. Igo-Kemenes, G. Maringer, D. E. Plane, W. Mohr, G. Yekutieli, J. G. Layter, B. B. Brabson, N. Wermes, D. G. Fong, Ehud Duchovni, M. F. Turner, H. Jeremie, M. Hansroul, P. Poffenberger, T. Mouthuy, Stephen Hillier, M. J. Oreglia, X. C. Lou, G. M. Dallavalle, K. Stephens, Paul Kyberd, F. K. Loebinger, J. R. McNutt, Kiyotomo Kawagoe, R. Shypit, T. Behnke, A. A. Carter, R. E. Hughes-Jones, U. Maur, Giora Mikenberg, Erez Etzion, S. Sanghera, J. Gascon, I. Wingerter, R. J. Homer, Tohru Takeshita, H. von der Schmitt, S. J. Pawley, P. Berlich, M. W. Redmond, J. M. Roney, H. Ihssen, D. J.P. Dumas, O. Schaile, John Hobbs, D. Axen, L. Köpke, P. Singh, Silvia Arcelli, A. Gaidot, Georges Azuelos, E. do Couto e Silva, S. W. Gensler, J. R. Carter, G. N. Patrick, A. Simon, Otmar Biebel, C. Moisan, J. P. Walker, M. Kuwano, T. Wlodek, P. Weber, M. Sproston, A. M. Rossi, J. P. Martin, P. Teixeira-Dias, S. Schreiber, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, T. J. McMahon, T. Kobayashi, D. E. Klen, Gareth J. Barker, D. G. Charlton, D. L. Wagner, M. Couch, T. Tsukamoto, S. Levegrün, V. Gibson, R. W. L. Jones, G. Quast, R. W. Springer, Alexander Wagner, Claude Leroy, A. Rollnik, J. F. Kral, P. Routenburg, K. W. Bell, J. Hagemann, J. Ludwig, K. Runge, A. Dieckmann, P. Bock, J. W. Gary, P. E.L. Clarke, J. P. Pansart, J. Banks, Max Weber, J. Schwiening, R. K. Carnegie, Shlomit Tarem, R. Humbert, G. A. Snow, C. P. Ward, S. De Jong, J. C. Hill, S. Weisz, J. A. Wilson, N. I. Geddes, R. D. Heuer, S. Bougerolle, F. Odorici, J. R. McMahon, Misao Sasaki, Fabrizio Fabbri, D. J. Miller, D. Van den plas, W. Schappert, B. Boden, T. Kawamoto, P. Debu, B. Poli, Horst Breuker, Phillip Allport, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, John Baines, Marcello Mannelli, D. R. Rust, S. Orito, M. Rosvick, P. S. Wells, O. Runolfsson, J. Mildenberger, Harold Nguyen, M. Jobes, U. Binder, C. J. Virtue, S. Rossberg, G. D. Lafferty, C. J. Oram, P. Lennert, Gideon Alexander, Paolo Capiluppi, P. Schenk, W. R. Gibson, C. Ho, M. Coupland, Gideon Bella, H. J. Burckhart, P. Scharff-Hansen, Claudio Grandi, C. Wahl, D. R. Ward, R. Yaari, H. Takeda, A. Beck, G. Transtromer, E. Heflin, S. Bethke, W. J. Larson, R. M. Brown, Marco Cuffiani, Lorne Levinson, R. P. Middleton, M. W. Moss, Jacqueline Batley, F. C. Grant, M. Jimack, B. W. Kennedy, M. A. Whalley, K. J. Anderson, T. R. Wyatt, F. G. Oakham, P. M. Hattersley, R. J. Barlow, H. Przysiezniak, C. P. Howarth, R. G. Kellogg, B. P. O'Neill, S. Wotton, A. M. Smith, Stefano Marcellini, James Letts, G. Vasseur, J. Goldberg, A. Buijs, J. E. Pilcher, B. Lorazo, B. Nellen, P. Leblanc, Andris Skuja, I. J. Bloodworth, H. G. Evans, M. J. Goodrick, I. Cohen, Tetsuro Mashimo, M. Settles, D. Hochman, N. J. Thackray, M. Hauschild, A. D. Schaile, P. Paschievici, N. K. Watson, G. W. Wilson, D. Karlen, J. D. Gillies, G. A. Bahan, V. H. Winterer, T. J. Smith, P. Mättig, S. R. Hou, C. M. Hawkes, M. Cooper, Daniel Lellouch, N. C. Wood, Takehiko Mori, W. Corn, S. W. O'Neale, Peter R Hobson, Sachio Komamiya, E. Ros, A. T. Watson, C. Fukunaga, T. P. Kokott, Rene Brun, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, W. J. Collins, Randall Sobie, T. W. Pritchard, P. A. Elcombe, D. L. Rees, J. Becker, and G. J. VanDalen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electron, Nuclear physics, Baryon, High Energy Physics::Experiment, Particle Physics - Experiment, Boson
Abstract: We observe evidence for the production of b-flavoured baryons in decays of the Z 0 boson with the OPAL detector at LEP. We find 68 Λl − , Λ l + candidates in 458 583 hadronic Z 0 decays. We interpret this as a signal of 55 ± 9 +0.3 −3.1 events from the semi-leptonic decays of b baryons. Assuming weakly decaying b baryons produced in Z 0 decays are mostly Λ b particles, we measure the product branching ratio (Γ b b /Γ had ) f ( b →Λ b ) B (Λ b →Λl − v X ) , averaged over the electron and muon channels, to be (6.2±1.0±1.5)×10 −4 .
Published: 1992

33. A global determination of $$\alpha _s (M_{Z^0 } )$$ at LEP

Author: John Hart, H. Mes, H. O. Ogren, Christoph Geich-Gimbel, R. Mir, H. Oh, Tohru Takeshita, I. P. Duerdoth, G. G. Hanson, M. W. Moss, Silvia Arcelli, D. Hochman, N. J. Thackray, Horst Breuker, M. M. Deninno, P. M. Hattersley, J. M. Lorah, J. Kroll, F. X. Gentit, G. Giacomelli, Georges Azuelos, W. Mohr, John Hobbs, J. E. Conboy, M. Ogg, H. Takeda, W. R. Gibson, F. G. Oakham, E.J. Prebys, N. Wermes, R. Van Kooten, J. F. Kral, K. W. Bell, C. Ho, D. C. Imrie, M. J. Oreglia, P. Igo-Kemenes, A. Pouladdej, G. Maringer, H. Jeremie, R. E. Hughes-Jones, U. Maur, Ehud Duchovni, C. J. Virtue, R. Shypit, M. S. Dixit, V. Gibson, E. do Couto e Silva, Max Weber, D. Pitman, M. H. Lehto, Frans Meijers, J. von Krogh, A. Beck, J. C. Hill, E. Heflin, Misao Sasaki, B. B. Brabson, A. Astbury, T. R. Wyatt, D. G. Fong, G. D. Lafferty, P. Ashton, M. Hauschild, F. Lamarche, G. P. Siroli, R. M. Brown, H. Ihssen, O. Ganel, J. Gascon, H. von der Schmitt, R. J. Barlow, R. J. Hemingway, P. Singh, A. J. Martin, Dave Robinson, P. E.L. Clarke, J. P. Martin, Lorne Levinson, F. S. Merritt, A. D. Schaile, D. Axen, H. Przysiezniak, P. Paschievici, A. Gaidot, M. Kuwano, T. Wlodek, B. C. Shen, M. Sproston, A. Jawahery, S. De Jong, I. J. Bloodworth, G. N. Patrick, L. A. del Pozo, P. S. Wells, S. W. Gensler, B. W. Kennedy, K. Riles, P. Jovanovic, F. Odorici, P. G. Estabrooks, A. K. Honma, J. W. Gary, R. K. Keeler, Kiyotomo Kawagoe, Austin Ball, W. G. Scott, A. Dieckmann, G. Tysarczyk-Niemeyer, V. H. Winterer, T. Kobayashi, S. J. Pawley, M. Yurko, Marcello Mannelli, D. Menszner, R. W. L. Jones, P. W. Jeffreys, P. A. Elcombe, P. Debu, M. Jobes, U. Binder, J. A. McKenna, Peter Sherwood, R. Kowalewski, Michael Dittmar, G. Yekutieli, A. Simon, Otmar Biebel, P. Berlich, C. K. Hargrove, J. M. Roney, P. M. Watkins, S. R. Hou, A. M. Lee, R. W. Springer, Alexander Wagner, S. Bougerolle, P. Scharff-Hansen, D. E. Klem, W. J. Larson, Alessandro Montanari, R. F. McGowan, L. Köpke, M. Coupland, R. Yaari, D. G. Charlton, D. L. Wagner, M. Couch, A. A. Carter, P. Weber, J. Hagemann, P. Le Du, H. Kreutzmann, J. G. Layter, G. Beaudion, B. Panzer-Steindel, J. Ludwig, S. Bethke, D. L. Rees, J. Becker, K. Runge, G. A. Snow, C. P. Ward, K. J. Anderson, P. Bock, I. Wingerter, Marco Cuffiani, R. Humbert, M. J. Losty, J. D. Gillies, M. F. Turner, G. J. VanDalen, C. Fukunaga, A. M. Smith, G. Vasseur, B. Lorazo, O. Schaile, N. C. Wood, F. C. Grant, M. A. Whalley, S. Sanghera, M. Settles, D. R. Rust, Gideon Bella, S. Schreiber, Y. Yang, Andris Skuja, D. J. Miller, D. E. Plane, T. J. McMahon, H. J. Burckhart, Jacqueline Batley, J. Schwiening, J. Allison, P. F. Harrison, T. Kawamoto, Tetsuro Mashimo, Stephen Hillier, N. K. Watson, G. M. Dallavalle, R. K. Carnegie, G. Duckeck, R. Ströhmer, J. A. Wilson, Shlomo Dado, D. Strom, P. D. Acton, Stephen Lloyd, W. Gorn, P. Lennert, S. Orito, G. T. Zorn, W. J. Collins, W. Schappert, M. Rosvick, O. Runolfsson, D. J.P. Dumas, X. C. Lou, G. A. Bahan, Randall Sobie, H. M. Bosch, Wolfram Dietrich Zeuner, A. Buijs, T. W. Pritchard, Sachio Komamiya, Giora Mikenberg, C. Y. Chang, Claudio Grandi, P. Taras, E. Ros, A. T. Watson, D. A. Hinshaw, Gideon Alexander, Paolo Capiluppi, P. Schenk, C. Wahl, T. Behnke, B. P. O'Neill, C. P. Howarth, G. W. Wilson, D. Karlen, J. E. Pilcher, J. Banks, S. Wotton, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, T. P. Kokott, Rene Brun, P. Poffenberger, T. J. Smith, Claude Leroy, J. P. Pansart, Erez Etzion, P. Mättig, Gareth J. Barker, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, Shlomit Tarem, S. Rossberg, C. J. Oram, S. W. O'Neale, Peter R Hobson, R. P. Middleton, J. Goldberg, B. Nellen, P. Leblanc, C. Moisan, J. P. Walker, H. G. Evans, P. Teixeira-Dias, M. J. Goodrick, I. Cohen, M. Hansroul, R. J. Homer, Margret Fincke-Keeler, J. Mildenberger, Harold Nguyen, P. Pfister, Paul Kyberd, F. K. Loebinger, M. W. Redmond, A. Rollnik, M. Jimack, P. Routenberg, N. I. Geddes, B. Boden, B. Poli, R. G. Kellogg, P. P. Allport, T. Mouthuy, Stefano Marcellini, K. Stephens, J. R. McNutt, James Letts, A. M. Rossi, G. Quast, T. Tsukamoto, John Baines, S. Levegrün, H. M. Fischer, D. R. Ward, A. Michelini, G. Transtromer, A. C. Janissen, S. A. Robins, and J. R. Carter
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Hadron, Perturbative QCD, Observable, Parton, Nuclear physics, Renormalization, High Energy Physics::Experiment, Resummation, Engineering (miscellaneous)
Abstract: The value of the strong coupling constant, $$\alpha _s (M_{Z^0 } )$$ , is determined from a study of 15 different observables in hadronicZ 0 and τ decays. The study includes global event shape variables, jet production rates, energy correlations, theZ 0 line shape and decay asymmetries and the hadronic branching fraction of τ-leptons. Differences between the αs values from the different observables can be consistently attributed to unknown higher order contributions to the calculations. These uncertaities may be parametrized by variations of the renormalization scale and of the parton virtuality to which the data are corrected, separately for each observable, resulting in a consistent description of the event shapes, jet rates and energy correlations with the value $$\alpha _s (M_{Z^0 } ) = 0.122_{ - 0.005}^{ + 0.006} $$ in . The error is dominated by the theoretical uncertainties. Application of recent calculations which include the resummation of leading and next-to-leading logarithms to all orders for some observables confirm this result with a reduced sensitivity to renormalization scale variations. TheZ 0 line shapes and τ-lepton branching ratios yield $$\alpha _s (M_{Z^0 } ) = 0.148 \pm 0.021$$ and $$\alpha _s (M_{Z^0 } ) = 0.123_{ - 0.007}^{ + 0.006} $$ , respectively, in . These measurements and their uncertainties are entirely independent of each other and from event shape and jet observables; the good agreement of the resulting αs values thus constitutes an important consistency check of the reliability of perturbative QCD.
Published: 1992

34. Measurement of B00 mixing in hadronic Z0 decays

Author: Kiyotomo Kawagoe, O. Ganel, J. Gascon, D. Axen, J. M. Roney, P. Weber, A. Wagner, Andris Skuja, R. P. Middleton, P. Le Du, M. Hauschild, B. Panzer-Steindel, D. E. Plane, Tetsuro Mashimo, J. L. Pinfold, C. Y. Chang, Mitsuaki Nozaki, G. Beaudoin, Stephen Hillier, G. M. Dallavalle, H. Mes, R. Van Kooten, M. H. Lehto, Sachio Komamiya, W. Gorn, Phillip Allport, Tohru Takeshita, P. Poffenberger, A. Astbury, F. K. Loebinger, M. W. Redmond, T. Behnke, R. Mir, H. Oh, R. M. Brown, F. C. Grant, M. A. Whalley, G. J. Barker, G. Yekutieli, D. J.P. Dumas, G. Mikenberg, I. P. Duerdoth, F. S. Merritt, Paolo Capiluppi, G. A. Bahan, G. P. Siroli, J. F. Kral, A. K. Honma, P. R. Hobson, E. Ros, A. T. Watson, G. Vasseur, A. Buijs, M. W. Moss, O. Biebel, P. M. Hattersley, A. Gaidot, N. Wermes, X. C. Lou, E. Etzion, S. J. Pawley, O. Runolfsson, John Hobbs, J. P. Pansart, P. Berlich, Claus Kleinwort, L. Köpke, R. Shypit, D. E. Klem, M. Jobes, U. Binder, G. Alexander, G. Bella, P. E.L. Clarke, R. J. Hemingway, P. Scharff-Hansen, W. J. Larson, C. Ho, C. Geich-Gimbel, Max Weber, M. J. Oreglia, J. Schwiening, P. D. Acton, Claudio Grandi, S. A. Robins, H. Ihssen, N. J. Thackray, K. Stephens, D. A. Hinshaw, H. J. Burckhart, M. Cooper, J. A. McKenna, E. Heflin, J. C. Hill, Misao Sasaki, M. F. Turner, M. Jimack, Jacqueline Batley, J. von Krogh, A. M. Smith, S. W. Gensler, G. Maringer, A. M. Lee, Rene Brun, M. Hansroul, B. W. Kennedy, B. C. Shen, J. M. Lorah, J. Banks, C. Wahl, H. M. Fischer, J. D. Gillies, D. C. Imrie, N. C. Wood, S. Tarem, S. Weisz, B. Lorazo, P. Ashton, Dave Robinson, J. Goldberg, M. Coupland, R. D. Heuer, T. P. Kokott, W. Mohr, C. P. Howarth, J. R. Carter, John Allison, P. Jovanovic, Austin Ball, D. Menszner, R. G. Kellogg, T. J. Smith, L. A. del Pozo, J. E. Pilcher, T. J. McMahon, C. Leroy, Fabrizio Fabbri, R. W.L. Jones, D. Van den plas, V. Gibson, R. J. Homer, M. Rosvick, G. A. Snow, C. P. Ward, P. A. Elcombe, R. K. Carnegie, G. Azuelos, B. B. Brabson, P. Mättig, D. G. Fong, S. Schreiber, Alessandro Montanari, H. von der Schmitt, G. N. Patrick, T. Kobayashi, J. G. Layter, A. A. Carter, B. Poli, Stefano Marcellini, J. A. Wilson, D. Pitman, R. Kowalewski, P. Debu, John Baines, E. Duchovni, D. R. Rust, B. Nellen, M. Sproston, W. Schappert, D. L. Rees, J. Becker, S. Bethke, G. Quast, Marco Cuffiani, C. M. Hawkes, D. G. Charlton, James Letts, M. Couch, P. Schenk, P. Lennert, J. Hart, O. Schaile, P. Taras, J. W. Gary, C. J. Oram, C. Fukunaga, M. J. Losty, A. J. Martin, C. Moisan, Marcello Mannelli, G. J. VanDalen, D. R. Ward, R. Humbert, P. F. Harrison, K. J. Anderson, Takehiko Mori, Michael Dittmar, S. Sanghera, J. Hagemann, P. S. Wells, C. J. Virtue, N. I. Geddes, P. Pfister, A. Michelini, A. C. Janissen, Terry Richard Wyatt, P. W. Jeffreys, A. Jawahery, R. Yaari, M. Fincke-Keeler, R. J. Barlow, G. Tysarczyk-Niemeyer, D. J. Miller, J. Mildenberger, Harold Nguyen, W. R. Gibson, A. Simon, T. W. Pritchard, Y. Yang, T. Kawamoto, Peter Sherwood, F. Odorici, D. Lellouch, M. Kuwano, R. W. Springer, J. Ludwig, P. Routenburg, S. Orito, A. Dieckmann, K. Runge, P. Bock, F. Lamarche, N. K. Watson, I. Cohen, D. Hochman, B. Boden, M. Yurko, G. Eckerlin, S. De Jong, I. J. Bloodworth, J. P. Walker, P. Teixeira-Dias, T. Mouthuy, G. Duckeck, R. Ströhmer, A. Rollnik, L. Levinson, W. J. Collins, G. D. Lafferty, D. Strom, H. Takeda, G. T. Zorn, F. G. Oakham, R. F. McGowan, P. Paschievici, H. M. Bosch, G. W. Wilson, M. Settles, H. O. Ogren, A. M. Rossi, P. Leblanc, Wolfram Dietrich Zeuner, M. M. Deninno, J. Kroll, J. P. Martin, T. Tsukamoto, S. Dado, G. G. Hanson, J. E. Conboy, M. Ogg, H. Kreutzmann, A. Pouladdej, A. D. Schaile, G. Giacomelli, V. H. Winterer, S. W. O'Neale, E.J. Prebys, S. R. Hou, D. Karlen, M. S. Dixit, Frans Meijers, Silvia Arcelli, U. Maur, S. Wotton, M. Weymann, H. E. Stier, P. G. Estabrooks, P. M. Watkins, P. Kyberd, I. Wingerter, S. Rossberg, K. W. Bell, P. Igo-Kemenes, A. Beck, R. E. Hughes-Jones, W. G. Scott, K. Riles, H. Jeremie, P. Singh, C. K. Hargrove, B. Holl, S. Levegrün, I. Zacharov, R. Sobie, Horst Breuker, S. Bougerolle, R. K. Keeler, M. J. Goodrick, G. Transtromer, H. Przysieniak, J. R. McNutt, S. L. Lloyd, B. P. O'Neill, and F. X. Gentit
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Muon, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Electron, Jet (particle physics), Bottom quark, Nuclear physics, High Energy Physics::Experiment, Mixing (physics), Lepton
Abstract: From a sample of approximately 135 000 hadronic Z0 decays recorded with the OPAL detector, 1 536 events were selected with two lepton candidates, either electrons or muons. A signal for B0 B 0 mixing was observed using the sign of the lepton charge to tag the charge of the b quark in decaying b-flavoured hadrons. A flavour discriminating variable was constructed from the lepton momentum and its component perpendicular to the jet axis. By fitting the fraction of events in which the two lepton charges are of the same sign, as a function of this variable, the average mixing parameter was measured to be χ = 0.145+0.041-0.035 ± 0.018, where the first error is statistical and the second is systematic.
Published: 1992

35. An improved measuremebts of αS (MZ0) using energy correlations with the OPAL detector at LEP

Author: H. M. Fischer, P. A. Elcombe, T. Mouthuy, T. J. McMahon, P. Routenburg, M. Cooper, B. Poli, P. Igo-Kemenes, Sachio Komamiya, A. M. Rossi, P. Debu, T. Tsukamoto, A. Michelini, S. Sanghera, J. Schweining, B. C. Shen, E. Ros, A. T. Watson, I. P. Duerdoth, F. Lamarche, R. Yaari, M. F. Turner, Richard Keeler, P. Jovanovic, D. J.P. Dumas, M. Hansroul, H. Ihssen, Austin Ball, D. L. Rees, W. Schappert, H. O. Ogren, O. Biebel, M. Jimack, John Allison, B. P. O'Neill, A. J. Martin, Rene Brun, Alessandro Montanari, M. Coupland, Gideon Bella, G. Vasseur, R. Mir, A. Astbury, P. Berlich, P. Lennert, R. J. Homer, S. Bougerolle, D. R. Rust, M. W. Moss, M. Sproston, G. J. VanDalen, A. D. Schaile, A. M. Lee, P. Poffenberger, J. Kroll, P. M. Hattersley, K. Stephens, U. Binder, H. Oh, R. G. Kellogg, P. Taras, R. M. Brown, S. W. Gensler, G. Maringer, F. X. Gentit, B. Boden, P. Mättig, E. Etzion, B. B. Brabson, N. C. Wood, W. J. Collins, S. De Jong, J. E. Conboy, T. Kobayashi, H. J. Burckhart, Jacqueline Batley, C. Geich-Gimbel, R. E. Hughes-Jones, G. W. Wilson, D. G. Fong, H. von der Schmitt, D. Menszner, D. Axen, Stefano Marcellini, J. P. Walker, A. C. Janissen, D. Karlen, A. Dieckmann, G. J. Barker, R. K. Carnegie, James Letts, M. Fincke-Keeler, G. D. Lafferty, R. Sobie, G. P. Siroli, Phillip Allport, P. Paschievici, M. Kuwano, P. Teixeira-Dias, A. A. Carter, M. Ogg, Tohru Takeshita, N. K. Watson, P. Singh, R. Shypit, G. Transtromer, G. A. Snow, H. E. Stier, R. Van Kooten, O. Schaile, M. H. Lehto, H. M. Bosch, D. C. Imrie, F. Odorici, V. Gibson, J. L. Pinfold, F. S. Merritt, John Baines, A. Rollnik, F. K. Loebinger, K. W. Bell, C. P. Ward, Kiyotomo Kawagoe, A. Beck, D. E. Plane, W. R. Gibson, Stephen Hillier, M. J. Goodrick, H. Takeda, H. Jeremie, J. W. Gary, H. Kreutzmann, Marcello Mannelli, W. G. Scott, J. Becker, K. J. Anderson, P. S. Wells, P. E.L. Clarke, G. M. Dallavalle, K. Runge, J. P. Martin, T. W. Pritchard, H. Przysiezniak, A. Wagner, J. F. Kral, C. J. Virtue, H. Mes, Terry Richard Wyatt, G. Duckeck, Richard J Hemingway, C. J. Oram, J. M. Roney, O. Runolfsson, M. Jobes, F. G. Oakham, E. Duchovni, P. G. Estabrooks, P. Kyberd, C. K. Hargrove, J. A. McKenna, Paolo Capiluppi, M. W. Redmond, P. Pfister, J. C. Hill, D. R. Ward, F. C. Grant, M. A. Whalley, P. Schenk, P. Scharff-Hansen, S. W. O'Neale, Peter R Hobson, T. P. Kokott, J. Hart, G. Tysarczyk-Niemeyer, Claudio Grandi, C. Ho, W. J. Larson, D. Pitman, Misao Sasaki, R. F. McGowan, A. Pouladdej, Marco Cuffiani, J. M. Lorah, M. M. Dennino, G. Mikenberg, D. Lellouch, C. Y. Chang, S. Rossberg, P. Bock, A. Buijs, S. J. Pawley, E. Heflin, G. G. Hanson, J. P. Pansart, M. J. Oreglia, Y. Yang, N. I. Geddes, R. J. Barlow, G. Alexander, B. Holl, P. Weber, S. Levegrün, P. F. Harrison, Claus Kleinwort, L. Köpke, S. Tarem, A. Gaidot, S. R. Hou, D. J. Miller, R. Humbert, G. N. Patrick, W. Mohr, S. Bethke, P. D. Acton, B. W. Kennedy, M. Hauschild, John Hobbs, S. A. Robins, D. Hochman, C. Fukunaga, I. Zacharov, M. J. Losty, G. Giacomelli, Stephen Lloyd, M. Yurko, J. Mildenberger, E.J. Prebys, Horst Breuker, Mitsuaki Nozaki, P. W. Jeffreys, X. C. Lou, A. M. Smith, C. Wahl, T. Behnke, C. Leroy, M. S. Dixit, B. Lorazo, G. Quast, P. Leblanc, S. Dado, J. Banks, G. Azuelos, Frans Meijers, P. Le Du, S. Weisz, R. D. Heuer, J. R. Carter, B. Panzer-Steindel, Fabrizio Fabbri, D. A. Hinshaw, D. Van den plas, M. Weber, L. Levinson, B. Nellen, J. G. Layter, D. E. Klem, A. K. Honma, D. G. Charlton, O. Ganel, K. Riles, M. Couch, G. Eckerlin, G. Beaudoin, N. J. Thackray, Andris Skuja, Harold Nguyen, J. Ludwig, C. P. Howarth, R. Kowalewski, J. Gascon, J. E. Pilcher, S. Schreiber, T. Kawamoto, S. Orito, V. H. Winterer, Tetsuro Mashimo, P. M. Watkins, W. Gorn, G. Yekutieli, M. Rosvick, G. A. Bahan, I. Wingerter, Silvia Arcelli, S. Wotton, A. Simon, M. Weymann, N. Wermes, A. Jawahery, Peter Sherwood, R. W. Springer, J. R. McNutt, U. Maur, D. Strom, G. T. Zorn, Wolfram Dietrich Zeuner, R. Ströhmer, J. A. Wilson, I. Cohen, Michael Dittmar, R. W.L. Jones, J. von Krogh, P. Ashton, Dave Robinson, L. A. del Pozo, J. Goldberg, T. J. Smith, I. J. Bloodworth, C. Moisan, James D Gillies, M. Settles, J. Hagemann, C. M. Hawkes, Takehiko Mori, and R. P. Middleton
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, media_common.quotation_subject, Electron–positron annihilation, Monte Carlo method, Hadron, Asymmetry, Hadronization, Nuclear physics, Renormalization, Correlation function, High Energy Physics::Experiment, Perturbation theory (quantum mechanics), Particle Physics - Experiment, media_common
Abstract: We report on an improved measurement of the value of the strong coupling constant σs at the Z0 peak, using the asymmetry of the energy-energy correlation function. The analysis, based on second-order perturbation theory and a data sample of about 145000 multihadronic Z0 decays, yields αs(Mz0 = 0.118±0.001(stat.)±0.003(exp.syst.)−0.004+0.0009 (theor. syst.), where the theoretical systematic error accounts for uncertainties due to hadronization, the choice of the renormalization scale and unknown higher-order terms. We adjust the parameters of a second-order matrix element Monte Carlo followed by string hadronization to best describe the energy correlation and other hadronic Z0 decay data. The αs result obtained from this second-order Monte Carlo is found to be unreliable if values of the renormalization scale smaller than about 0.15 Ecm are used in the generator.
Published: 1992

36. A study of - in Z0 decays

Author: Gideon Bella, H. J. Burckhart, Jacqueline Batley, M. Jobes, F. Odorici, R. Mir, U. Binder, H. Oh, H. O. Ogren, Michael Dittmar, C. M. Hawkes, M. Cooper, Daniel Lellouch, F. S. Merritt, G. Yekutieli, R. F. McGowan, Christoph Geich-Gimbel, Silvia Arcelli, M. M. Deninno, Tohru Takeshita, P. Scharff-Hansen, J. Kroll, F. X. Gentit, J. E. Conboy, Paul Kyberd, M. Ogg, R. Shypit, Takehiko Mori, T. Mouthuy, F. K. Loebinger, M. W. Moss, P. Igo-Kemenes, A. Pouladdej, G. Maringer, M. J. Oreglia, H. Jeremie, C. Moisan, J. P. Walker, F. Lamarche, R. E. Hughes-Jones, N. C. Wood, U. Maur, W. J. Larson, J. D. Hobbs, Georges Azuelos, P. M. Hattersley, H. Mes, M. W. Redmond, R. J. Hemingway, I. P. Duerdoth, R. Van Kooten, G. G. Hanson, P. Singh, J. W. Gary, A. Rollnik, K. W. Bell, P. Teixeira-Dias, G. A. Snow, C. P. Ward, A. A. Carter, G. Giacomelli, Max Weber, P. E.L. Clarke, M. Sprotson, J. R. Carter, A. M. Rossi, K. J. Anderson, Misao Sasaki, T. Behnke, R. W. L. Jones, M. H. Lehto, L. Janissen, B. C. Shen, P. Jovanovic, A. M. Smith, G. N. Patrick, E.J. Prebys, Austin Ball, Kiyotomo Kawagoe, T. Tsukamoto, D. E. Klem, S. Levegrün, D. Menszner, R. Sobie, G. Vasseur, B. Lorazo, S. Wotton, P. Le Du, W. G. Scott, M. S. Dixit, Frans Meijers, G. Beaudoin, M. Jimack, John Allison, H. Kreutzmann, B. Panzer-Steindel, D. Hochman, N. J. Thackray, I. J. Bloodworth, A. Simon, Otmar Biebel, E. K. U. Gross, A. P. Wagner, Alessandro Montanari, Gunter Quast, M. Weymann, K. Stephens, J. M. Roney, N. I. Geddes, R. Yaari, D. G. Charlton, J. R. McNutt, A. Gaidot, M. Couch, M. F. Turner, M. Kuwano, R. Kowalewski, M. Geerts, J. P. Martin, S. Bethke, B. B. Brabson, Shlomo Dado, C. Fukunaga, R. Humbert, Marco Cuffiani, M. Settles, H. E. Stier, John Hill, B. Poli, D. G. Fong, J. Gascon, X. C. Lou, S. De Jong, H. von der Schmitt, S. Schreiber, J. T.M. Chrin, M. J. Losty, G. Duckeck, T. J. McMahon, J. D. Gillies, P. G. Estabrooks, R. G. Kellogg, P. Routenburg, P. G. Murphy, D. Strom, V. Gibson, B. P. O'Neill, J. Hart, H. M. Fischer, T. Kawamoto, A. Michelini, Giora Mikenberg, G. T. Zorn, John Baines, R. J. Barlow, A. Astbury, P. M. Watkins, P. Debu, G. W. Wilson, Marcello Mannelli, R. K. Carnegie, Stefano Marcellini, A. Dieckmann, S. Orito, John H. Schwarz, J. Hagemann, D. Karlen, J. A. Wilson, D. C. Imrie, Y. Yang, C. Y. Chang, M. Fincke-Keeler, H. M. Bosch, Wolfram Dietrich Zeuner, Andris Skuja, S. A. Robins, I. Wingerter, J. L. Pinfold, O. Ganel, Tetsuro Mashimo, J. G. Layter, P. Taras, A. J. Martin, D. R. Ward, C. J. Oram, P. F. Harrison, Mitsuaki Nozaki, K. Riles, G. P. Siroli, W. Schappert, W. Gorn, J. Mildenberger, S. Bougerolle, G. A. Bahan, W. J. Collins, Harold Nguyen, S. Sanghera, Stephen Lloyd, J. M. Lorah, Erez Etzion, D. E. Plane, G. D. Lafferty, Gareth J. Barker, C. K. Hargrove, B. Holl, D. A. Hinshaw, Shlomit Tarem, W. Mohr, P. Pfister, Stephen Hillier, G. M. Dallavalle, G. Eckerlin, T. J. Smith, Phillip Allport, P. A. Elcombe, S. Rossberg, T. W. Pritchard, H. Takeda, I. Zacharov, J. C. Armitage, R. P. Middleton, F. G. Oakham, Alan Watson, D. L. Rees, D. J.P. Dumas, J. Becker, P. Mättig, S. J. Pawley, Horst Breuker, G. J. VanDalen, B. Nellen, P. Leblanc, M. Hansroul, W. R. Gibson, C. Ho, Claus Kleinwort, L. Köpke, R. J. Homer, D. Axen, P. Schenk, A. D. Schaile, A. Beck, A. Jawahery, Gideon Alexander, Paolo Capiluppi, G. Tysarczyk-Niemeyer, E. Heflin, M. J. Goodrick, I. Cohen, R. M. Brown, Lorne Levinson, N. Wermes, B. W. Kennedy, Ehud Duchovni, D. R. Rust, H. Ihssen, S. W. Gensler, T. Kobayashi, P. Lennert, J. Banks, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, J. von Krogh, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, P. Ashton, Dave Robinson, Sachio Komamiya, V. H. Winterer, S. R. Hou, T. P. Kokott, Rene Brun, N. K. Watson, S. W. O'Neale, Peter R Hobson, M. Hauschild, P. Paschievici, P R Poffenberger, D. J. Miller, H. Przysiezniak, O. Runolfsson, C. Wahl, L. Lessard, Claudio Grandi, P. W. Jeffreys, P. S. Wells, A. M. Lee, C. J. Virtue, C. P. Howarth, Terry Richard Wyatt, J. E. Pilcher, M. Coupland, O. Schaile, M. A. Whalley, A. Buijs, Richard Keeler, Claude Leroy, J. P. Pansart, and C. Milstene
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Branching fraction, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Elementary particle, Nuclear physics, Pair production, Pion, High Energy Physics::Experiment, Nuclear Experiment
Abstract: In this paper an investigation of the production of D ∗ ± mesons produced in e + e − collisions at energies around the Z 0 pole is presented. Based on 115 D ∗ ± mesons with x D∗  2E D ∗ /E cm > 0.2 the properties of D ∗ mesons produced in the reaction Z 0 → c c are studied. Fixing the yield and the fragmentation function of bottom quarks to the values obtained at LEP using lepton tags, and average energy fraction of the D ∗ ± mesons from primary charmed quarks of 〈x c → D ∗ 〉 = 0.52 ± 0.03 +- 0.01 is found and Γ z 0 →c c = (323 ± 61 ± 35) MeV is determined. The first error is the combined statistical and systematic error from this experiment, and the second the total error from other sources.
Published: 1991

37. A measurement of energy correlations and a determination of αs(M2Z) e+e- annihilations at √s=91 GeV

Author: F. X. Gentit, F. Odorici, H. Takeda, G. A. Snow, C. P. Ward, C. Y. Chang, M. S. Dixit, G. Mikenberg, G.W. Wilson, L. Janissen, R. Stroehmer, W. J. Collins, M. T. French, Mitsuaki Nozaki, Christoph Geich-Gimbel, P. Singh, Erez Etzion, B. J. Saunders, Gareth J. Barker, D. C. Imrie, T. W. Pritchard, P. Igo-Kemenes, S. Rossberg, Michael Dittmar, M. M. Deninno, M. J. Losty, R. W. L. Jones, R. P. Middleton, J. Kroll, G. Yekutieli, G. Maringer, T. Mashino, J. Goldberg, H. Jeremie, B. Nellen, Shlomo Dado, S. L. Lloyd, G. P. Siroli, P. Leblanc, P. Le Du, H. Kreutzmann, R. G. Kellogg, J. E. Conboy, R. E. Hughes-Jones, U. Maur, A. A. Carter, A. Jawahery, J.P. Pansart, N. K. Watson, P. G. Murphy, J. Grunhaus, M. Ogg, J. D. Gillies, M. J. Goodrick, Stefano Marcellini, T. J. Smith, H. Oh, I. Cohen, G. Tysarczyk-Niemeyer, D. G. Fong, V. Gibson, Kiyotomo Kawagoe, K. J. Anderson, A. Pouladdej, Peter Sherwood, Gideon Bella, J. Gascon, S. Wotton, N. C. Wood, H. J. Burckhart, P. Mättig, B. C. Shen, B. Wuensch, A. M. Rossi, J. M. Lorah, M. Weymann, G. D. Lafferty, Takashi Yoshida, R. W. Springer, A. P. Wagner, J. M. Roney, H. von der Schmitt, C. Fukunaga, D. E. Klem, G.T.J. Arnison, D. J. Miller, A. Buijs, J. Ludwig, K. Runge, P. Bock, Jacqueline Batley, A. A. Macbeth, M. Hauschild, Makoto Minowa, W. Mohr, I. J. Bloodworth, T. Tsukamoto, H. E. Stier, G. Knop, J. Mildenberger, Harold Nguyen, J. Hagemann, M. F. Turner, P. G. Estabrooks, S. Schreiber, T. J. McMahon, R. K. Carnegie, N. I. Geddes, M. Jimack, D. Karlen, O. Ganel, A. J. Martin, F. Lamarche, P. Lennert, Marcello Mannelli, T. P. Kokott, Rene Brun, C. N. P. Gee, J. A. Wilson, B. Poli, F. S. Merritt, C. M. Hawkes, J. Allison, Daniel Lellouch, P. M. Watkins, M. Jobes, U. Binder, W. J. Murray, R. J. Hemingway, R. Kowalewski, H. M. Fischer, D. Granite, Takehiko Mori, J. Ma, W. Schappert, D. Strom, P. Scharff-Hansen, Paul Kyberd, F. K. Loebinger, G. T. Zorn, P. Jovanovic, A. Michelini, I. Wingerter, W. J. Larson, J. D. Hobbs, M. Sasaki, E. K. U. Gross, A. Gaidot, P. E.L. Clarke, M. Kuwano, T. Behnke, Austin Ball, D. Menszner, M. W. Redmond, Wolfram Dietrich Zeuner, K. Riles, J. L. Pinfold, J. W. Gary, S. A. Robins, M. Sproston, A. Rollnik, M. W. Moss, M. Z. Akrawy, I. Harrus, A. M. Smith, P. M. Hattersley, M. J. Oreglia, M. H. Lehto, P. Routenburg, J. R. Carter, Alessandro Montanari, A. Dieckmann, H. Mes, G. Vasseur, J. von Krogh, J. Raab, B. Lorazo, F. G. Oakham, Andris Skuja, P. A. Elcombe, P. Ashton, B. Holl, S. W. O'Neale, Peter R Hobson, H. El Mamouni, Tohru Takeshita, R. Yaari, S. Bethke, Marco Cuffiani, D. L. Rees, A. Shapira, J. Becker, A. D. Schaile, I. P. Duerdoth, Georges Azuelos, S. J. Pawley, Claus Kleinwort, L. Köpke, Horst Breuker, G. N. Patrick, A. Simon, Otmar Biebel, K. W. Bell, Max Weber, O. Schaile, W. Gorn, P. S. Wells, J. C. Hill, G. Giacomelli, C. J. Virtue, Terry Richard Wyatt, D. G. Charlton, A. T. Watson, M. Coupland, E.J. Prebys, J. Banks, Gunter Quast, M. Couch, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, R. Humbert, Frans Meijers, J. T.M. Chrin, T. Kawamoto, V. H. Winterer, S. Orito, John H. Schwarz, S. R. Hou, J. G. Layter, C. Wahl, C. P. Howarth, J. E. Pilcher, N. Wermes, C. K. Hargrove, Ehud Duchovni, R. A. Sansum, H. Ihssen, S. Sanghera, S. W. Gensler, Phillip Allport, J. P. Martin, C. M. Roach, B.P. O'Neil, D. E. Plane, Stephen Hillier, G. M. Dallavalle, P. Farthouat, Gideon Alexander, Paolo Capiluppi, D. Hochman, N. J. Thackray, J. Hart, G. J. VanDalen, R. J. Barlow, P. Pfister, Y. Yang, D. J.P. Dumas, P. W. Jeffreys, J. C. Armitage, T. Kobayashi, A. M. Lee, K. Stephens, J. R. McNutt, P. Debu, M. Hansroul, R. J. Homer, John Baines, M. Regimbald, O. Runolfsson, A. J.P. O'Dowd, J. P. Walker, D. R. Ward, W. R. Gibson, C. Ho, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, L. Lessard, B. W. Kennedy, C. Milstene, and H. Hagedorn
Subjects: Coupling constant, Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, Nuclear physics, Renormalization, Particle decay, High Energy Physics::Experiment, Astrophysics::Earth and Planetary Astrophysics, Boson
Abstract: From an analysis of multi-hadron events from Z 0 decays, values of the strong coupling constant α s ( M 2 Z 0 )=0.131±0.006 (exp)±0.002(theor.) and α s ( M z 0 2 ) = −0.009 +0.007 (exp.) −0.002 +0.006 (theor.) are derived from the energy-energy correlation distribution and its asymmetry, respectively, assuming the QCD renormalization scale μ = M Z 0 . The theoretical error accounts for differences between O ( α 2 s ) calculations. A two parameter fit Λ MS and the renormalization scale μ leads to Λ MS =216±85 MeV and μ 2 s =0.027±0.013 or to α s ( M 2 Z 0 )=0.117 +0.006 −0.008 (exp.) for the energy-energy correlation distribution. The energy-energy correlation asymmetry distribution is insensitive to a scale change: thus the α s value quoted above for this variable includes the theoretical uncertainty associated with the renormalization scale.
Published: 1990

38. Measurements of the decay of the Z0 into lepton pairs

Author: J. Waterhouse, B. J. Saunders, Phillip Allport, B. C. Shen, H. M. Fischer, T. J. McMahon, J. C. Armitage, E. J. Spreadbury, D. Duchesneau, J. A. Wilson, P. Grosse-Wiesmann, A. J.P. O'Dowd, I. Cohen, P. Le Du, D. Granite, C. Milstene, R. W.L. Jones, D. G. Fong, E. Jin, H. von der Schmitt, D. J.P. Dumas, S. R. Hou, Gideon Bella, J. von Krogh, J. Raab, G. A. Snow, C. P. Ward, G. Knop, Despina Hatzifotiadou, H. J. Burckhart, H. Jeremie, H. Kreutzmann, Jacqueline Batley, C. Geich-Gimbel, P. Ashton, R. M. Brown, G. T.J. Arnison, Marcello Mannelli, H. Wang, Andris Skuja, F. S. Merritt, G. D. Lafferty, Michael Dittmar, Kiyotomo Kawagoe, Tetsuro Mashimo, J. L. Pinfold, Gunter Quast, C. J. Virtue, J. P. Martin, F. Roehner, P. Kyberd, Paolo Capiluppi, J. M. Roney, Tohru Takeshita, K. W. Bell, P. Bock, D. G. Charlton, M. Couch, A. M. Rossi, D. E. Plane, W. Gorn, P. A. Elcombe, G. Yekutieli, W. R. Gibson, T. P. Kokott, B. Holl, Stephen Hillier, J. Heintze, P. G. Estabrooks, M. Jobes, D. Hochman, I. P. Duerdoth, D. L. Rees, P. Routenburg, R. Kowalewski, S. Schreiber, J. T.M. Chrin, C. K. Hargrove, C. M. Roach, B. P. O'Neill, D. Karlen, N. Lupu, A. Dieckmann, C. Fukunaga, P. Scharff-Hansen, W. J. Larson, A. Buijs, G. J. VanDalen, H. Boerner, G. P. Siroli, A. Jawahery, Peter Sherwood, T. Kawamoto, M. Jimack, R. W. Springer, M. Coupland, N. K. Watson, P. G. Murphy, U. Maur, C. N.P. Gee, A. M. Smith, H. El Mamouni, D. Strom, Horst Breuker, G. T. Zorn, P. M. Watkins, P. Igo-Kemenes, Wolfram Dietrich Zeuner, F. Beck, R. Ströhmer, A. Wagner, Rolf-Dieter Heuer, T. Tsukamoto, G. N. Patrick, B. Poli, M. Sproston, A. Rollnik, S. Orito, S. Zylberajch, S. Sanghera, C. Wahl, M. F. Turner, H. Oh, O. Runolfsson, P. Lennert, J. M. Lorah, H. Yamashita, B. Lorazo, M. Z. Akrawy, Makoto Minowa, H. E. Stier, T. W. Pritchard, M. Weymann, M. W. Moss, W. Mohr, M. M.B. Lasota, P. S. Hinde, M. Regimbald, P. M. Hattersley, A. Possoz, H. Takeda, I. Wingerter, C. Beard, C. Ho, Marco Cuffiani, J. W. Gary, E. Heflin, S. Bethke, B. W. Kennedy, J. C. Hill, Misao Sasaki, M. J. Oreglia, N. I. Geddes, G. J. Barker, N. C. Wood, M. M. Deninno, R. J. Barlow, A. A. Carter, D. J. Miller, J. Schwarz, J. Kroll, M. Ogg, J. R. Carter, R. Yaari, J. Ma, W. J. Murray, L. Levinson, P. Jovanovic, S. Wotton, Austin Ball, F. K. Loebinger, F. X. Gentit, J. E. Conboy, A. C. McPherson, W. Schappert, M. S. Dixit, Alessandro Montanari, B. Nellen, J. Banks, G. Azuelos, H. Mes, A. Simon, S. W. Gensler, R. E. Hughes-Jones, A. Shapira, Aldo Michelini, E. Gross, Fabrizio Fabbri, D. Van den plas, G. Tysarczyk, O. Ganel, K. Riles, M. W. Redmond, S. Weisz, P. Farthouat, A. Pouladdej, G. Mikenberg, T. Kobayashi, R. K. Carnegie, O. Schaile, D. C. Imrie, J. Ludwig, C. P. Howarth, J. Grunhaus, Terry Richard Wyatt, F. G. Oakham, J. E. Pilcher, E. Duchovni, M. Hansroul, A. A. Macbeth, G. W. Wilson, P. W. Jeffreys, S. J. Pawley, G. Maringer, Claus Kleinwort, L. Köpke, Masatoshi Koshiba, J. Hart, M. Hauschild, D. E. Klem, Harold Nguyen, V. H. Winterer, P. Leblanc, R. J. Homer, L. Lessard, K. J. Anderson, Y. Yang, Achim Müller, O. Biebel, John Allison, C. Y. Chang, A. D. Schaile, Stephen Lloyd, R. G. Kellogg, B. Gandois, Mitsuaki Nozaki, M. Weber, Stefano Marcellini, K. Stephens, Masatoshi Imori, John Baines, G. Bavaria, F. Odorici, D. R. Ward, F. Lamarche, M. T. French, O. W. Davies, M. J. Losty, Richard J Hemingway, S. W. O'Neale, Peter R Hobson, A. T. Watson, Rene Brun, J. Hagemann, I. J. Bloodworth, James D Gillies, A. Perez, R. A. Sansum, G. M. Dallavalle, J. Goldberg, T. J. Smith, P. Mättig, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, R. P. Middleton, D. Menszner, M. J. Goodrick, J. G. Layter, J. D. Hobbs, G. Alexander, G. Giacomelli, S. Dado, H. Hagedorn, Frans Meijers, K. Runge, B. Wuensch, and N. Wermes
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Standard Model (mathematical formulation), Basis (linear algebra), Electron–positron annihilation, Hadron, Particle Physics - Experiment, Lepton
Abstract: We report on a measurement of the processes e+e−→e+e−, e+e−→μ+μ−, and e+e−→τ+τ− near the Z0 pole. On the basis of 163 e+e−, 101 μ+μ− and 87 τ+τ− events we obtain Γee=89±4±4 MeV, Γμμ=85±9±6 MeV and Γττ=87±10±8 MeV, compatible with the standard model. Combining these with our previous results on hadronic Z0 decays, we find a hadronic width Γhad=1787±81±90 MeV and an invisible width Γinv=552±85±71 MeV.
Published: 1990

39. Measurement of cross-sections and asymmetries in e+e- collisions at 130-140 GeV centre-of-mass energy

Author: A. I. McNab, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, T. P. Kokott, A. Luig, H. Mes, I. P. Duerdoth, M. F. Turner-Watson, M. Morii, Peter R Hobson, Madjid Boutemeur, P. Routenburg, J. Lauber, D. Rigby, R. J. Hemingway, Otmar Biebel, Gideon Bella, J. Goldberg, F. G. Oakhamh, O. C. Cooke, P. Fath, C. H. Shepherd-Themistocleous, H. J. Burckhart, Tara Shears, Koji Yoshimura, B. W. Kennedy, P. Jovanovic, P. E.L. Clarke, M. K. Jones, Jacqueline Batley, J. P. Martin, P. A. Hart, Austin Ball, Peter Krieger, R. W. Springer, S. Yamashita, J. von Krogh, P. G. Estabrooks, R. K. Keeler, Gregor Herten, M. Tscheulin, Michael Hildreth, S. De Jong, J. Letts, Manuella Vincter, Alessandro Montanari, Norbert Wermes, Georges Azuelos, N. L. Rodning, M. J. Pearce, M. St arks, Sherry Towers, P. M. Watkins, T. Kawamoto, H. G. Evans, E. Tsur, R. J. Hawkings, U. Jost, R. Mir, D. L. Rees, F. Scharf, B. Poli, Paolo Giacomelli, M. Hansroul, H. Przysiezniak, German Martinez, T. Omori, F. Strumia, M. Verzocchi, I. Cohen, K. W. Bell, Hans-Christian Schultz-Coulon, L. A. del Pozo, B. Stockhausen, Paul Kyberd, F. K. Loebinger, T. Hilse, A. D. Schaile, P. Igo-Kemenes, B. Wilkens, J. P. Pansart, R. Van Kooten, S. Orito, M. Rosvick, P. Weber, J. Pálinkás, T. J. McMahon, A. N. Bell, J. Steuerer, Randall Sobie, O. Runolfsson, Michael Schulz, G. D. Lafferty, Frank Fiedler, E. Lefebvre, W. Matthews, J. C. Hill, Misao Sasaki, H. Takeda, H. Jeremie, J. Schwiening, Yoram Rozen, Gunter Wolf, F. X. Gentit, R. K. Carnegie, R. J. Homer, M. A. Thomson, F. Odorici, Silvia Arcelli, M. Hapke, W. J. McDonald, B. C. Shen, J. E. Pilcher, E. L. Barberio, S. M. Gascon-Shotkin, M. Foucher, Matthias Schröder, M. R. Ingram, R. E. Hughes-Jones, Joleen Pater, R. Howard, D. E. Hutchcroft, Siegfried Bethke, I. J. Blood worth, J. A. Wilson, T. Wlodek, C. Dallapiccola, M. Sproston, J. S. White, A. K. Honma, B. Nijjhar, W. G. Scott, A. Rooke, R. Giacomelli, M. Thiergen, C. Beeston, S. Wotton, S. L. Chu, M. J. Oreglia, J. G. Layter, Achim Stahl, Claudio Grandi, Junichi Kanzaki, N. Altekamp, D. Karlen, C. Burgard, N. Tesch, E. A. Mckigney, M. J. Goodrich, R. J. Barlow, Matthew Evans, C. Sbarra, Shlomo Dado, Ekg Sarkisyan, P. W. Jeffreys, W. P. Lai, A. M. Rossi, N. K. Watson, Guenter Duckeck, O. Schaile, E. do Couto e Silva, Dezso Horvath, M. J. Losty, F. Wäckerle, C. Charlesworth, Jean-Arcady Meyer, J. R. Carter, G. Yekutieli, B. Schmitt, H. M. Fischer, A. Michelini, J. M. Roney, G. N. Patrick, B. Nellen, N. I. Geddest, A. A. Carter, Ron Folman, Roger Jones, C. Darling, D. M. Gingrich, John Allison, P. S. Wells, Stefan Kluth, W. Mohr, Sven Menke, D. Axen, T. J. Smith, Shlomit Tarem, A. Posthaus, Stefania Xella, A. S. Turcot, U. Müller, R. Lahmann, A. Jawahery, D. C. Imrie, M. Palazzo, P. Utzat, Giora Mikenberg, Terry Richard Wyatt, K. Stephens, S. A. Robins, J. E. Bloomer, A. J. Martin, T. Behnke, M. G. Rison, G. W. Wilson, J. J. Ward, P. Mättig, Shoji Asai, Peter Sherwood, M. Hauschild, P. Vikas, Eilam Gross, D. Lanske, G. P. Siroli, S. Braibant, Gabriella Pasztor, J. King, P. Berlich, Alexander Wagner, R. G. Kellogg, C. Markus, V. Gibson, Dave Charlton, J. Ludwig, Csaba Hajdu, G. A. Snow, C. P. Ward, G. G. Hanson, M. Gruwé, G. T. Jones, D. J. Miller, C. M. Hawkes, K. Runge, P. Bock, S. Söldner-Rembold, C. K. Hargrove, Daniel Lellouch, E. H. Vokurka, Stefano Marcellini, D. M. Strom, Richard Nisius, P. Gagnon, D. R. Ward, H. Lafoux, T. Kress, S. B. Anderson, P. Szymanski, H. Fukui, R. Bürgin, R. Rylko, Marco Cuffiani, M. Fierro, J. E.G. Edwards, Takehiko Mori, A. Sittler, P. Schenk, G. Giacomelli, H. M. Bosch, Stan Bentvelsen, M. S. Dixit, Frans Meijers, V. Zacek, A. Joly, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, D. R. Rust, A. M. Lee, M. Tecchio, E. von Törne, Reda Tafirout, James Pinfold, W. R. Gibson, D. Chrisman, Volker Blobel, D. G. Fong, C. Lewis, B. T. Bouwens, J. Gascon, Lorne Levinson, A. Malik, J. W. Gary, D. S. Koetke, Gilles Beaudoin, Marcello Mannelli, Andris Skuja, Stephen Lloyd, A. Skillman, S. Petzold, G. D. Long, Tetsuro Mashimo, Robert M Brown, C. Hartmann, D. E. Plane, Stephen Hillier, W. Gorn, G. M. Dallavalle, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, Ehud Duchovni, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, J. E. Conboy, A. Fürtjes, M. Jimack, F. S. Merritt, J. Bechtluft, J. A. McKenna, S. W. Gensler, T. Kobayashi, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, S. W. O'Neale, K. J. Anderson, P. Poffenberger, P. Schütz, A. Gaidot, C. Y. Chang, P. Taras, Michael Kobel, and Julie Kirk
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Resonance (particle physics), Standard Model, Nuclear physics, Radiative transfer, High Energy Physics::Experiment, Energy (signal processing), Particle Physics - Experiment, Lepton
Abstract: Production of events with multihadronic and leptonic final states has been measured in e + e − collisions at centre-of-mass energies significantly above the Z 0 mass, using the OPAL detector at LEP. A substantial production rate of radiative Z 0 γ events was observed, as expected, together with events with less energetic initial-state photons. The cross-sections and leptonic forward-backward asymmetries were measured and compared with Standard Model expectations. In a model-independent fit to the Z 0 lineshape, the hadronic cross-section and lepton asymmetries presented here provide constraints on the size of the γZ 0 -interference term which are complementary to those afforded by LEP data accumulated at the Z 0 resonance.
Published: 1996

40. Investigation of the string effect using final state photons

Author: Shlomo Dado, Giora Mikenberg, B. C. Shen, H. Mes, Dave Charlton, Siegfried Bethke, Doug Gingrich, I. P. Duerdoth, P. Fath, C. Hartmann, D. E. Plane, Madjid Boutemeur, A. K. Honma, W. G. Scott, R. Bürgin, B. Fabbro, P. G. Estabrooks, R. Kowalewski, Gunter Wolf, P. Poffenberger, N. I. Geddes, S. Wotton, G. M. Dallavalle, G. Giacomelli, M. Hapke, S. Braibant, N. L. Rodning, T. Hilse, B. Poli, P. Schütz, P. M. Watkins, P. Igo-Kemenes, M. J. Losty, Gideon Bella, Alan Watson, Kiyotomo Kawagoe, O. Runolfsson, G. A. Snow, C. P. Ward, W. Matthews, H. J. Burckhart, H. Jeremie, R. E. Hughes-Jones, Jacqueline Batley, S. Söldner-Rembold, H. M. Fischer, M. J. Oreglia, E. Lefebvre, A. S. Turcot, V. Gibson, Silvia Arcelli, P. Weber, M. A. Thomson, R. G. Kellogg, A. Michelini, F. Odorici, Claudio Grandi, I. J. Bloodworth, E. do Couto e Silva, P. W. Jeffreys, Reda Tafirout, A. Gaidot, E. A. Mckigney, T. Wlodek, Stefano Marcellini, M. Sproston, R. Lahmann, D. C. Imrie, G. N. Patrick, S. A. Robins, Georges Azuelos, Otmar Biebel, Sven Menke, K. W. Bell, W. P. Lai, G. P. Siroli, J. King, P. Routenburg, D. L. Wagner, P. Bright-Thomas, M. Settles, J. M. Roney, T. Tsukamoto, N. Tesch, J. C. Hill, Misao Sasaki, G. D. Lafferty, W. R. Gibson, H. Deng, J. R. Carter, S. W. O'Neale, J. J. Ward, P. Vikas, A. Joly, T. Kobayashi, Yoram Rozen, A. Beck, M. Foucher, D. Lanske, K. J. Anderson, J. Letts, M. W. Redmond, Hans-Christian Schultz-Coulon, Lorne Levinson, Randall Sobie, Norbert Wermes, S. M. Gascon-Shotkin, Michael Schulz, P. D. Phillips, Sherry Towers, T. Kawamoto, Gilles Beaudoin, C. Y. Chang, A. Skillman, D. L. Rees, P. Taras, T. R. Wyatt, Michael Kobel, T. W. Pritchard, S. Orito, F. Scharf, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Junichi Kanzaki, M. Rosvick, A. M. Rossi, R. J. Barlow, S. G. Clowes, Julie Kirk, H. Lafoux, M. Fierro, J. E.G. Edwards, A. D. Schaile, Guenter Duckeck, R. Giacomelli, N. K. Watson, D. Karlen, C. Burgard, W. Mohr, A. Posthaus, S. B. Anderson, P. Szymanski, Ehud Duchovni, Stan Bentvelsen, M. Jimack, C. Darling, T. J. Smith, F. Palmonari, S. W. Gensler, P. Mättig, Shoji Asai, S. J. Hillier, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, V. Zacek, Stephen Lloyd, M. Tecchio, Robert M Brown, F. S. Merritt, Gregor Herten, K. Ametewee, Frank Fiedler, D. Hochman, Gideon Alexander, Paolo Capiluppi, K. Stephens, J. Bechtluft, B. Wilkens, J. A. McKenna, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, D. R. Ward, T. Kress, J. C. Clayton, F. X. Gentit, J. E. Conboy, A. Fürtjes, J. E. Pilcher, Sachio Komamiya, Theodoros Geralis, E. Ros, N. J. Oldershaw, A. Buijs, D. M. Strom, R.J. Akers, C. Stegmann, H. Fukui, T. P. Kokott, A. Luig, O. Schaile, G. Vaseur, M. Starks, A. J. Martin, P. Scharff-Hansen, G. W. Wilson, P. S. Wells, M. Hauschild, C. Markus, A. M. Smith, B. Lorazo, Richard Keeler, James Pinfold, D. G. Fong, R. Howard, J. Gascon, J. P. Pansart, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, Andris Skuja, G. D. Long, M. F. Turner-Watson, Tetsuro Mashimo, M. Morii, Peter R Hobson, W. Gorn, D. R. Rust, A. M. Lee, G. A. Beck, U. Müller, Achim Stahl, P. Teixeira-Dias, E. von Törne, C. K. Hargrove, Matthias Schröder, T. J. McMahon, B. Schmitt, Tara Shears, U. C. Dunwoody, J. Schwiening, R. K. Carnegie, P. A. Hart, B. Nijjhar, M. J. Pearce, Margret Fincke-Keeler, J. A. Wilson, R. Van Kooten, C.J. Beeston, F. Wäckerle, O. C. Cooke, P. Berlich, M. Fanti, P. Gagnon, J. von Krogh, Paolo Giacomelli, M. Hansroul, J. Allison, C. H. Shepherd-Themistocleous, R. J. Hawkings, R. J. Homer, R. D. Heuer, Fabrizio Fabbri, L. A. del Pozo, G. T. Zorn, C. Sbarra, G. Yekutieli, H. M. Bosch, Wolfram Dietrich Zeuner, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, M. G. Rison, J. Steuerer, Eilam Gross, T. Behnke, Marco Cuffiani, J. G. Layter, D. Rigby, R. J. Hemingway, S. L. Chu, D. Axen, Stefan Kluth, Shlomit Tarem, C. J. Oram, A. I. McNab, J. Goldberg, B. W. Kennedy, B. Nellen, A. Jawahery, P. Jovanovic, Austin Ball, Peter Krieger, H. G. Evans, M. J. Goodrick, C. Charlesworth, I. Cohen, Peter Sherwood, Manuella Vincter, Alessandro Montanari, D. E. Hutchcroft, R. W. Springer, Alexander Wagner, C. Dallapiccola, J. D. Gillies, N. Altekamp, J. Ludwig, D. J. Miller, K. Runge, R. Mir, J. Lauber, F. G. Oakham, P. Bock, E. L. Barberio, P. E.L. Clarke, M. K. Jones, J. P. Martin, M. Tscheulin, S. De Jong, H. Przysiezniak, G. G. Hanson, P. Schenk, M. S. Dixit, and Frans Meijers
Subjects: Physics, Quantum chromodynamics, Particle physics, Photon, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Hadron, Monte Carlo method, Parton, String (physics), Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The string effect in QCD is investigated using data from the OPAL detector at LEP. By comparing the charged particle flow in three-jet multihadronic events with that in events with two jets and a hard isolated photon, the sensitivity to particular models is reduced. A comparison with various Monte Carlo models is presented. The difference in particle flows in the interquark region is found to be well reproduced by a leading order calculation of soft gluon emission, in the spirit of the Local Parton Hadron Duality hypothesis.
Published: 1995

41. A model independent measurement of quark and gluon jet properties and differences

Author: E. Lefebvre, Reda Tafirout, U. Müller, Madjid Boutemeur, Kiyotomo Kawagoe, F. Odorici, Gunter Wolf, F. X. Gentit, Ehud Duchovni, P. W. Jeffreys, F. S. Merritt, P. G. Estabrooks, P. Gagnon, M. Jimack, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, Frank Fiedler, C. Dallapiccola, D. Hochman, John Allison, J. Steuerer, D. R. Rust, J. D. Gillies, J. G. Layter, F. Palmonari, Margret Fincke-Keeler, J. A. McKenna, P. Bright-Thomas, S. Wotton, Eilam Gross, P. Weber, C. K. Hargrove, K. Stephens, C. Hartmann, D. E. Plane, S. W. Gensler, N. Altekamp, P. M. Watkins, N. K. Watson, A. M. Lee, P. Poffenberger, S. J. Hillier, E. von Törne, R. J. Barlow, J. J. Ward, P. Vikas, P. S. Wells, Matthias Schröder, R. Bartoldus, C. Charlesworth, A. S. Turcot, G. M. Dallavalle, S. M. Gascon-Shotkin, J. Bechtluft, R. G. Kellogg, M. F. Turner-Watson, D. J. Miller, H. O. Ogren, D. Lanske, B. C. Shen, H. Mes, I. P. Duerdoth, M. Morii, Gideon Bella, Terry Richard Wyatt, Christoph Geich-Gimbel, Peter R Hobson, P. Fath, V. Gibson, James Pinfold, P. Schütz, P. Routenburg, Stefano Marcellini, R. Van Kooten, Alan Watson, D. G. Fong, H. J. Burckhart, Marco Cuffiani, Jacqueline Batley, Silvia Arcelli, J. Gascon, W. Mohr, R. Lahmann, D. C. Imrie, A. Posthaus, J. E. Conboy, A. Gaidot, W. R. Gibson, Shlomo Dado, Sachio Komamiya, F. Wäckerle, A. Fürtjes, Stefan Kluth, Shlomit Tarem, Theodoros Geralis, D. M. Gingrich, E. Ros, R. Mir, A. M. Rossi, Richard Keeler, S. L. Chu, A. Beck, A. Joly, Gordon H. Hanson, P. Berlich, G. P. Siroli, W. Matthews, J. Lauber, T. P. Kokott, A. Luig, D. R. Ward, Siegfried Bethke, Gregor Herten, A. K. Honma, B. Nijjhar, J. King, M. Fanti, A. Malik, C. J. Oram, Tara Shears, Lorne Levinson, W. G. Scott, T. Kress, P. D. Phillips, P. Igo-Kemenes, K. Ametewee, M. A. Thomson, E. A. Mckigney, B. Wilkens, Gideon Alexander, M. W. Redmond, W. P. Lai, U. C. Dunwoody, J. W. Gary, Gilles Beaudoin, J. C. Clayton, A. Skillman, Paolo Capiluppi, P. A. Hart, D. S. Koetke, F. G. Oakham, S. G. Clowes, C. Y. Chang, R. Howard, Marcello Mannelli, J. E. Duboscq, B. Stockhausen, Paul Kyberd, F. K. Loebinger, T. Wlodek, S. B. Anderson, J. P. Pansart, R. D. Heuer, Fabrizio Fabbri, P. Szymanski, M. J. Pearce, J. M. Roney, P. Schenk, E. L. Barberio, M. Fierro, R. Kowalewski, J. E.G. Edwards, N. I. Geddes, M. Sproston, J. E. Pilcher, M. S. Dixit, D. Rigby, R. J. Hemingway, P. Taras, T. Kobayashi, Frans Meijers, Andris Skuja, R. Giacomelli, H. Jeremie, Giora Mikenberg, N. L. Rodning, N. J. Oldershaw, G. D. Long, B. W. Kennedy, P. Jovanovic, A. Buijs, D. M. Strom, T. Tsukamoto, M. J. Losty, R.J. Akers, P. E.L. Clarke, M. K. Jones, Austin Ball, Dave Charlton, Peter Krieger, N. Tesch, R. E. Hughes-Jones, J. P. Martin, C. Stegmann, B. Poli, Michael Kobel, T. Hilse, Stan Bentvelsen, S. Braibant, Manuella Vincter, Alessandro Montanari, Stephen Lloyd, Tetsuro Mashimo, M. Tecchio, Robert M Brown, M. Tscheulin, O. Runolfsson, H. Fukui, S. De Jong, R. Bürgin, B. Fabbro, R. W. Springer, O. Schaile, H. Przysiczniak, G. Giacomelli, E. do Couto e Silva, C. Beeston, Claudio Grandi, G. A. Snow, C. P. Ward, Georges Azuelos, H. M. Fischer, M. Starks, A. J. Martin, S. Söldner-Rembold, Sven Menke, K. W. Bell, A. Michelini, W. Gorn, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, J. C. Hill, G. W. Wilson, Misao Sasaki, M. Hauschild, C. Markus, Julie Kirk, H. Lafoux, T. W. Pritchard, D. L. Rees, S. A. Robins, Guenter Duckeck, F. Scharf, Paolo Giacomelli, M. Hansroul, P. Scharff-Hansen, A. D. Schaile, S. W. O'Neale, C. H. Shepherd-Themistocleous, K. J. Anderson, R. J. Homer, A. M. Smith, G. Vasseur, B. Lorazo, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, T. Behnke, O. C. Cooke, D. Axen, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Otmar Biebel, D. L. Wagner, J. von Krogh, H. Deng, R. J. Hawkings, J. Letts, Norbert Wermes, L. A. del Pozo, Sherry Towers, T. Kawamoto, C. Sbarra, S. Orito, M. Rosvick, M. Hapke, D. E. Hutchcroft, G. Yekutieli, M. J. Oreglia, J. R. Carter, G. N. Patrick, A. A. Carter, Ron Folman, Roger Jones, B. J. King, C. Darling, T. J. Smith, P. Utzat, P. Mättig, Shoji Asai, C. M. Hawkes, Daniel Lellouch, M. G. Rison, Takehiko Mori, V. Zacek, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, I. J. Bloodworth, A. I. McNab, M. Settles, J. Goldberg, B. Nellen, Yoram Rozen, A. Jawahery, M. Foucher, Junichi Kanzaki, D. Karlen, C. Burgard, H. G. Evans, M. J. Goodrick, and I. Cohen
Subjects: Quark, Physics, Cone algorithm, Particle physics, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Charged particle, Vertex (geometry), Gluon, Nuclear physics, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Three jet events are selected from hadronic Z0 decays with a symmetry such that the two lower energy jets are produced with the same energy and in the same jet environment. In some of the events, 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, with an estimated purity of about 93%. Comparing these gluon jets to the inclusive sample of lower energy jets from the symmetric data set yields direct, model independent measurements of quark and gluon jet properties, which have essentially no bias except from the jet definition. Results are reported using both thek⊥ and cone jet definitions. For thek⊥ algorithm, we find $$\frac{{\left\langle {n_{k_ \bot }^{ch.} } \right\rangle gluon}}{{\left\langle {n_{k_ \bot }^{ch.} } \right\rangle quark}} = 1.25 \pm 0.02(stat.) \pm 0.03(syst.)$$ for the ratio of the mean charged particle multiplicity of gluon to quark jets, while for the cone algorithm, we find $$\frac{{\left\langle {n_{cone}^{ch.} } \right\rangle gluon}}{{\left\langle {n_{cone}^{ch.} } \right\rangle quark}} = 1.10 \pm 0.02(stat.) \pm 0.02(syst.)$$ using a cone size of 30°. We also report measurements of the angular distributions of particle energy and multiplicity around the jet directions, and of the fragmentation functions of the jets. Gluon jets are found to be substantially broader and to have a markedly softer fragmentation function than quark jets, in agreement with our earlier observations.
Published: 1995

42. An improved measurement of the $B_{s}^{0}$ lifetime

Author: J. Steuerer, J. Lauber, H. Takeda, F. G. Oakham, E. L. Barberio, Matthias Schröder, D. R. Rust, M. Yurko, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, P. W. Jeffreys, Manuella Vincter, O. Tousignant, Alessandro Montanari, Gunter Wolf, C. Dallapiccola, J. D. Gillies, P. A. Elcombe, R. J. Barlow, D. J. Miller, A. M. Lee, H. O. Orgen, T. J. McMahon, T. Behnke, A. M. Rossi, Hans-Christian Schultz-Coulon, Reda Tafirout, Randall Sobie, J. G. Layter, P. Bright-Thomas, Sachio Komamiya, J. Schwiening, M. J. Oreglia, C. M. Hawkes, Daniel Lellouch, R. K. Carnegie, Michael Schulz, G. D. Lafferty, Stephen Lloyd, S. W. O'Neale, K. J. Anderson, E. Lefebvre, J. C. Clayton, S. Wotton, S. Braibant, Theodoros Geralis, J. J. Ward, Marco Cuffiani, P. A. Hart, P. Vikas, E. Ros, A. T. Watson, B. C. Shen, M. Tecchio, C. Charlesworth, P. Igo-Kemenes, Takehiko Mori, Gideon Bella, Margret Fincke-Keeler, J. A. Wilson, R. Bartoldus, T. W. Pritchard, H. M. Fischer, H. J. Burckhart, Madjid Boutemeur, M. J. Pearce, Jacqueline Batley, T. P. Kokott, Siegfried Bethke, P. Gagnon, V. Zacek, T. Hilse, H. Jeremie, P. S. Wells, F. Odorici, D. E. Plane, A. K. Honma, B. Nijjhar, G. W. Wilson, J. R. Carter, A. Michelini, G. N. Patrick, O. Runolfsson, G. A. Snow, C. P. Ward, P. Scharff-Hansen, A. Luig, S. L. Chu, R. E. Hughes-Jones, U. Maur, W. G. Scott, R. Kowalewski, Terry Richard Wyatt, F. Scharf, C. Y. Chang, M. Hauschild, Guenter Duckeck, Christoph Geich-Gimbel, G. A. Bekc, G. M. Dallavalle, D. L. Rees, Erez Etzion, C. Beeston, P. Taras, S. Söldner-Rembold, Otmar Biebel, Claudio Grandi, K. Ametewwe, S. A. Robins, G. G. Hanson, G. T. Zorn, M. W. Redmond, A. D. Schaile, I. J. Bloodworth, Michael Kobel, O. C. Cooke, A. S. Turcot, C. Markus, Stefan Kluth, Shlomit Tarem, D. L. Wagner, H. Deng, Xinchou Lou, G. Giacomelli, H. M. Bosch, Wolfram Dietrich Zeuner, P. G. Estabrooks, Carla Sbarra, E. do Couto e Silva, Gideon Alexander, P. Schenk, A. Buijs, A. M. Smith, D. M. Strom, R. D. Heuer, Fabrizio Fabbri, C. J. Oram, Marcello Fanti, U. Müller, N. K. Watson, M. Settles, G. Vasseur, D. Axen, R. K. Keeler, C. Stegmann, Yoram Rozen, Julie Kirk, H. Lafoux, B. Lorazo, A. Jawahery, M. S. Dixit, N. Capdevielle, J. von Krogh, Frans Meijers, H. Fukui, W. R. Gibson, Kiyotomo Kawagoe, R. Van Kooten, R. P. Middleton, V. H. Winterer, A. I. McNab, B. Stockhausen, Paul Kyberd, F. K. Loebinger, M. Foucher, Norbert Wermes, Achim Stahl, Andris Skuja, Paolo Capiluppi, M. F. Turner-Watson, Peter Sherwood, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, M. Morii, Peter R Hobson, P. Teixeira-Dias, G. D. Long, Dave Charlton, Tetsuro Mashimo, Sherry Towers, T. Kawamoto, R. Giacomelli, J. P. Martin, Dave Robinson, Alexander Wagner, J. Hagemann, J. Ludwig, Junichi Kanzaki, M. J. Losty, P. Poffenberger, F. X. Gentit, J. Goldberg, B. Nellen, P. Leblanc, N. I. Geddes, K. Runge, P. Bock, F. Palmonari, M. Tscheulin, D. Karlen, J. E. Conboy, C. Burgard, A. Fürtjes, H. Mes, S. De Jong, I. P. Duerdoth, Peter Fischer, S. G. Clowes, M. Fierro, J. E.G. Edwards, Ehud Duchovni, A. Beck, E. Heflin, T. G. Shears, P. Routenburg, L. A. del Pozo, P. Weber, P. M. Watkins, R. M. Brown, Lorne Levinson, C. K. Hargrove, Shlomo Dado, S. Orito, B. Schmitt, Gregor Herten, M. Rosvick, R. Bürgin, B. Fabbro, N. L. Rodning, P. Fath, B. Poli, M. Jimack, P. Schütz, P. D. Phillips, Gilles Beaudoin, A. Skillman, D. M. Gingrich, H. Przysiezniak, Michael Dittmar, W. Gorn, H. G. Evans, W. Mohr, G. Yekutieli, R. Lahmann, D. C. Imrie, M. J. Goodrick, I. Cohen, P. Berlich, C. Darling, A. Posthaus, Paolo Giacomelli, F. S. Merritt, B. Wilkens, M. Hansroul, R. Howard, Claude Leroy, D. Hochman, John Allison, J. P. Pansart, P. Szymanski, A. A. Carter, Ron Folman, Roger Jones, R. W. Springer, S. W. Gensler, G. P. Siroli, J. King, T. J. Smith, K. Stephens, P. Mättig, Shoji Asai, S. J. Hillier, J. E. Pilcher, James Pinfold, Giora Mikenberg, Tohru Takeshita, C. H. Shepherd-Themistocleous, A. Yeaman, Christoph Schwick, T. Kobayashi, D. G. Fong, P. Utzat, J. Gascon, W. Matthews, R. J. Homer, M. G. Rison, J. A. McKenna, M. A. Thomson, C. Jui, N. J. Oldershaw, V. Gibson, R. G. Kellogg, R.J. Akers, Silvia Arcelli, Stan Bentvelsen, J. W. Gary, D. S. Koetke, E. K. U. Gross, A. Gaidot, Marcello Mannelli, J. E. Duboscq, Georges Azuelos, D. R. Ward, Barry King, Stefano Marcellini, T. Kress, James Letts, O. Schaile, T. Wlodek, M. Sproston, K. W. Bell, M. Starks, A. J. Martin, T. Tsukamoto, N. Tesch, J. C. Hill, Misao Sasaki, W. P. Lai, J. M. Roney, and R. Mir
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Meson, Electron–positron annihilation, Hadron, B meson, Particle Physics - Experiment, Lepton
Abstract: This letter presents an updated measurement of the lifetime of the B s 0 meson using 3.6 million hadronic Z 0 decays recorded by the OPAL detector at LEP from 1990 to 1994. A sample of B s 0 decays is obtained using D s − l + combinations, where the D s − is reconstructed in either the φπ − or K ∗0 K − decay mode. From 79 ± 13 D x l combinations attributed to B s 0 decays in this data sample, we measure τ (B s 0 ) = 1.54 −0.21 +0.25 ± 0.06 ps, where the errors are statistical and systematic, respectively.
Published: 1995

43. Search for rare hadronic B decays

Author: Gideon Bella, D. Rigby, R. J. Hemingway, C. M. Hawkes, H. J. Burckhart, Jacqueline Batley, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, Daniel Lellouch, H. Mes, I. P. Duerdoth, Takehiko Mori, James Pinfold, Margret Fincke-Keeler, R. Mir, J. Lauber, H. Takeda, J. C. Clayton, F. G. Oakham, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, E. L. Barberio, P. Poffenberger, Peter Fischer, D. G. Fong, J. Steuerer, H. M. Fischer, P. Igo-Kemenes, M. Hauschild, H. Jeremie, J. Gascon, J. Hart, C. Dallapiccola, J. P. Martin, Xinchou Lou, F. S. Merritt, Silvia Arcelli, A. Michelini, John Allison, P. Schütz, J. D. Gillies, S. De Jong, C. Markus, R. E. Hughes-Jones, M. Yurko, U. Maur, Erez Etzion, R. J. Barlow, P. S. Wells, P. W. Jeffreys, P. Pfister, H. von der Schmitt, Terry Richard Wyatt, M. J. Oreglia, Stefan Kluth, N. K. Watson, C. Y. Chang, A. Höcker, Shlomit Tarem, E. do Couto e Silva, M. Coupland, W. R. Gibson, D. Axen, Tara Shears, D. R. Rust, R. G. Kellogg, S. A. Robins, S. Rossberg, P. Bright-Thomas, Michael Kobel, Tohru Takeshita, T. Behnke, E. Lefebvre, C. J. Oram, F. Odorici, J. R. Carter, Hans-Christian Schultz-Coulon, Richard Keeler, Peter Sherwood, D. S. Koetke, J. A. McKenna, G. N. Patrick, A. M. Lee, Stefano Marcellini, Otmar Biebel, P. A. Hart, R. P. Middleton, J. J. Ward, A. I. McNab, Marcello Fanti, H. Lafoux, I. J. Bloodworth, R. W. Springer, Alexander Wagner, Georges Azuelos, Barry King, Randall Sobie, Michael Schulz, G. D. Lafferty, J. Goldberg, K. W. Bell, D. G. Charlton, D. L. Wagner, James Letts, J. Hagemann, J. Ludwig, B. Nellen, T. J. McMahon, R. Howard, Claude Leroy, J. P. Pansart, M. J. Pearce, H. Deng, R. Humbert, A. Jawahery, Marco Cuffiani, P. Leblanc, K. Runge, P. Bock, J. C. Hill, Misao Sasaki, A. Yeaman, P. D. Grannis, T. W. Pritchard, P. Le Du, B. Fabbro, R. Bartoldus, R. Van Kooten, D. Pitman, M. H. Lehto, W. Mohr, A. Beck, T. Kobayashi, J. Mildenberger, Gregor Herten, H. G. Evans, A. Buijs, D. M. Strom, B. C. Shen, S. L. Chu, M. Settles, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, Gordon H. Hanson, A. Posthaus, B. Wilkens, M. J. Goodrick, I. Cohen, Yoram Rozen, M. Foucher, Norbert Wermes, P. Gagnon, Sherry Towers, Theodoros Geralis, E. Ros, E. Heflin, G. Giacomelli, Guenter Duckeck, T. Kawamoto, R. Ströhmer, C. Stegmann, H. Przysiezniak, H. Fukui, F. Liu, H. O. Ogren, Christoph Geich-Gimbel, S. G. Clowes, A. Astbury, S. Orito, M. Rosvick, J. W. Gary, J. Schwiening, D. M. Gingrich, J. M. Roney, P. Berlich, M. Fierro, S. W. O'Neale, Gunter Wolf, K. J. Anderson, R. Kowalewski, M. J. Losty, M. W. Redmond, A. Skillman, M. A. Thomson, P. Schenk, Paolo Giacomelli, U. Müller, M. Hansroul, J. E. Pilcher, T. Hilse, Carla Sbarra, G. T. Zorn, A. J. Martin, H. M. Bosch, Wolfram Dietrich Zeuner, G. W. Wilson, T. P. Kokott, A. Luig, O. Runolfsson, V. H. Winterer, Lorne Levinson, A. M. Rossi, D. Karlen, M. S. Dixit, S. Wotton, R. K. Carnegie, E. K. U. Gross, A. Gaidot, D. Hochman, Madjid Boutemeur, Frans Meijers, R. Lahmann, D. C. Imrie, B. Stockhausen, Paul Kyberd, F. K. Loebinger, P. D. Phillips, C. Burgard, T. Wlodek, M. Sproston, C. Beeston, Claudio Grandi, K. Stephens, C. H. Shepherd-Themistocleous, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, D. J. Miller, P. G. Estabrooks, S. Komamiya, Marcello Mannelli, J. E. Duboscq, N. I. Geddes, J. R. McNutt, R.J. Akers, R. J. Homer, J. G. Layter, D. A. Hinshaw, J. A. Wilson, G. P. Siroli, C. K. Hargrove, R. Giacomelli, C. Charlesworth, Z. Li, J. King, Matthias Schröder, Christoph Schwick, P. Szymanski, B. Poli, F. X. Gentit, J. E. Conboy, A. Fürtjes, T. Tsukamoto, N. Tesch, C. Darling, T. J. Smith, M. F. Turner-Watson, M. Morii, C. Moisan, V. Gibson, P. A. Elcombe, P. M. Watkins, Peter R Hobson, P. Scharff-Hansen, C. Jui, Kiyotomo Kawagoe, Stan Bentvelsen, Achim Stahl, O. Schaile, P. Routenburg, P. Teixeira-Dias, P. Mättig, Shoji Asai, P. Weber, D. R. Ward, B. Schmitt, A. M. Smith, J. Becker, G. Vasseur, B. Lorazo, Andris Skuja, F. Scharf, G. D. Long, Tetsuro Mashimo, A. D. Schaile, W. Gorn, J. von Krogh, D. E. Plane, Dave Robinson, P. Bentkowski, Michael Dittmar, G. Yekutieli, G. M. Dallavalle, A. A. Carter, Ron Folman, Roger Jones, M. G. Rison, Alan Watson, G. Beaudoin, Shlomo Dado, Giora Mikenberg, S. Braibant, G. A. Snow, C. P. Ward, D. L. Rees, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, M. Jimack, H. Ihssen, S. W. Gensler, S. J. Hillier, Stephen Lloyd, M. Tecchio, and Robert M Brown
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Neutral current, Meson, Branching fraction, Hadron, Analytical chemistry, Invariant mass, Particle Physics - Experiment
Abstract: A search for rare decays of B hadrons has been performed using approximately two million hadronic Z 0 decays collected by the OPAL experiment between 1990 and 1993. The exclusive decay channels B d 0 → π + π − , B d 0 → K + π − , B s 0 → π + K − and B s 0 → K + K − have been studied. Such decays include contributions from flavour changing neutral current processes such as hadronic penguin decays. No significant excess of events has been observed in the π + π − , π + K − and K + K − invariant mass distributions. Consequently, upper limits on the B d 0 branching ratios, Br(B d 0 → π + π − ) −5 and Br(B d 0 →K + π − ) −5 , and on the B s 0 branching ratios, Br(B s 0 → π + K − ) −4 and Br(B s 0 →K + K − ) −4 , have been set at the 90% confidence level. These limits assume that the ratio of the partial decay widths of the Z 0 , λ (Z 0 → bb)/λ(Z 0 → hadrons), is 0.217 and that the fractions of B d 0 and B s 0 mesons produced during fragmentation are 39.5% and 12% respectively. The B s 0 branching ratio limits are the first such limits obtained.
Published: 1994

44. Measurement of the Production Rates of Charged Hadrons in $e^{+}e^{-}$ Annihilation at the $Z^{0}$

Author: H. Mes, I. P. Duerdoth, R. Kowalewski, F. C. Grant, D. E. Plane, R.J. Akers, Erez Etzion, Stefan Kluth, A. Astbury, P. Bentkowski, Shlomit Tarem, Margret Fincke-Keeler, B. C. Shen, S. Rossberg, U. Müller, C. J. Oram, G. M. Dallavalle, N. K. Watson, A. J. Martin, Gunter Wolf, S. Wotton, P. Poffenberger, R. P. Middleton, A. Buijs, R. Mir, O. Schaile, D. A. Hinshaw, Gideon Alexander, Alan Watson, D. M. Strom, C. Stegmann, J. Goldberg, J. Hart, C. Dallapiccola, B. Nellen, D. J.P. Dumas, P. Leblanc, Siegfried Bethke, A. K. Honma, W. G. Scott, Paolo Capiluppi, H. G. Evans, P. Schütz, M. J. Goodrick, I. Cohen, Silvia Arcelli, C. K. Hargrove, W. Mohr, P. Pfister, H. Fukui, J. D. Gillies, P. Igo-Kemenes, T. Behnke, H. Jeremie, R. E. Hughes-Jones, U. Maur, T. J. McMahon, P. A. Elcombe, M. J. Losty, J. Schwiening, Tara Shears, M. J. Oreglia, R. K. Carnegie, E. do Couto e Silva, R. J. Barlow, C. Y. Chang, M. F. Turner, J. A. Wilson, P. E.L. Clarke, P. A. Hart, G. Beaudoin, M. K. Jones, E. Lefebvre, M. Hauschild, C. Markus, J. Steuerer, M. J. Pearce, D. J. Miller, F. Odorici, Richard Keeler, Michael Kobel, P. Paschievici, Ehud Duchovni, J. Becker, John Allison, Paolo Giacomelli, W. R. Gibson, F. S. Merritt, M. Jimack, P. Le Du, B. Fabbro, H. Ihssen, R. Ströhmer, H. Lafoux, J. R. Carter, G. N. Patrick, M. Hansroul, A. Beck, E. Heflin, J. M. Roney, S. W. Gensler, Matthias Schröder, T. Hilse, J. P. Martin, O. Runolfsson, S. De Jong, G. T. Zorn, R. M. Brown, R. Howard, Claude Leroy, F. Scharf, S. J. Hillier, T. Kobayashi, G. J. VanDalen, J. von Krogh, J. P. Pansart, Madjid Boutemeur, C. H. Shepherd-Themistocleous, Lorne Levinson, R. J. Homer, Georges Azuelos, H. M. Bosch, Gideon Bella, Gregor Herten, Wolfram Dietrich Zeuner, A. Skillman, M. A. Thomson, Dave Robinson, P. G. Estabrooks, C. Wahl, K. W. Bell, B. Wilkens, B. W. Kennedy, E. Torrente-Lujan, Z. Li, Otmar Biebel, H. J. Burckhart, G. E. Richards, N. J. Tresilian, Jacqueline Batley, P. M. Hattersley, Shlomo Dado, C. Beeston, R. D. Heuer, L. A. del Pozo, D. G. Charlton, D. L. Wagner, C. Sbarra, A. Syoosi, A. Gaidot, P. S. Wells, J. C. Hill, J. E. Pilcher, Misao Sasaki, Fabrizio Fabbri, S. W. O'Neale, Claudio Grandi, D. Axen, C. Moisan, A. Jawahery, K. J. Anderson, D. Van den plas, T. Wlodek, M. Sproston, Michael Dittmar, Terry Richard Wyatt, H. Deng, R. Humbert, R. G. Kellogg, R. Yaari, G. Yekutieli, G. A. Beck, P. M. Watkins, Achim Stahl, P. Teixeira-Dias, Peter Sherwood, D. S. Koetke, M. Coupland, C. M. Hawkes, M. Cooper, Daniel Lellouch, R. W. Springer, Alexander Wagner, N. Tesch, Marco Cuffiani, A. A. Carter, Ron Folman, Roger Jones, J. Lauber, Xinchou Lou, J. Hagemann, D. R. Rust, Giora Mikenberg, J. Ludwig, K. Runge, P. Bock, M. Morii, Norbert Wermes, Takehiko Mori, Sherry Towers, T. Kawamoto, B. Schmitt, Stefano Marcellini, S. L. Chu, Peter R Hobson, M. G. Rison, James Letts, S. Orito, M. Rosvick, A. M. Lee, H. Takeda, Kiyotomo Kawagoe, I. J. Bloodworth, J. A. McKenna, H. Przysiezniak, G. A. Snow, C. P. Ward, M. Settles, F. G. Oakham, R. Van Kooten, D. Pitman, P. Routenburg, D. L. Rees, Paul Kyberd, F. K. Loebinger, M. H. Lehto, M. Fierro, M. Yurko, M. Foucher, P. W. Jeffreys, G. Giacomelli, Sachio Komamiya, A. D. Schaile, D. M. Gingrich, P. Berlich, P. Schenk, Theodoros Geralis, E. Ros, G. W. Wilson, P. Bright-Thomas, D. Karlen, C. Burgard, M. S. Dixit, J. J. Ward, Frans Meijers, A. Rollnik, R. Giacomelli, R. J. Hemingway, P. Weber, T. P. Kokott, A. Luig, R. Bartoldus, J. G. Layter, C. Darling, P. Jovanovic, C. Charlesworth, T. J. Smith, Austin Ball, H. O. Ogren, Christoph Geich-Gimbel, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, P. Mättig, Manuella Vincter, Alessandro Montanari, R. Lahmann, D. C. Imrie, C. Jui, M. W. Redmond, J. Kroll, G. P. Siroli, J. King, F. X. Gentit, A. Yeaman, Christoph Schwick, J. E. Conboy, A. Fürtjes, V. H. Winterer, P. Scharff-Hansen, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, A. M. Smith, G. Vasseur, B. Lorazo, T. W. Pritchard, Guenter Duckeck, James Pinfold, D. G. Fong, J. Gascon, H. von der Schmitt, J. W. Gary, Marcello Mannelli, J. E. Duboscq, Andris Skuja, G. D. Long, Tetsuro Mashimo, W. Gorn, N. I. Geddes, B. Boden, B. Poli, H. M. Fischer, A. Michelini, S. A. Robins, K. Stephens, P. F. Harrison, J. R. McNutt, M. Tecchio, A. M. Rossi, V. Gibson, G. Quast, T. Tsukamoto, D. R. Ward, J. C. Clayton, S. L. Loloyd, S. Barnett, and D. Hochman
Subjects: Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Monte Carlo method, Nuclear physics, Baryon, Momentum, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Bar (unit)
Abstract: The inclusive production rates of π±,K± andp$\bar p$ inZ0 decays have been measured with the OPAL detector at LEP. Using the energy loss measurement in the jet chamber, the momentum range up to the beam energy (45.6 GeV/c) has been covered. Differential cross sections and total particle yields are given. Comparisons of the inclusive momentum spectra and the total rates with predictions of the JETSET and the HERWIG Monte Carlo model are presented. The total single rates are found to be 17.05±0.43 π±, 2.42±0.13K± and 0.92±0.11p$\bar p$ per hadronic event. Predictions of JETSET for cross sections and total rates agree very well for π±; however, for momenta greater than 4 GeV/c,K± rates are underestimated and$\bar p$ rates are overestimated. Combined with data of other particle species there is evidence that the peak positions in the ξ=ln(1/x p ) distributions show a different mass dependence for mesons and baryons. However, both JETSET and HERWIG Monte Carlo predictions agree with the observed data.
Published: 1994

45. Improved measurements of the neutral current from hadron and lepton production at LEP

Author: Erez Etzion, Stefan Kluth, Shlomit Tarem, A. Astbury, Shlomo Dado, J. Steuerer, Andris Skuja, U. Müller, S. Rossberg, C. J. Oram, J. Allison, W. R. Gibson, A. J. Martin, G. Duckeck, R. Mir, Tohru Takeshita, R. P. Middleton, R. Ströhmer, Paul Kyberd, F. K. Loebinger, T. J. Smith, A. Rollnik, R. Giacomelli, Tetsuro Mashimo, X. C. Lou, Ehud Duchovni, Georges Azuelos, R. Bartoldus, A. Beck, J. Hart, P. A. Elcombe, F. C. Grant, M. A. Whalley, R. G. Kellogg, E. Heflin, C. Y. Chang, M. Jimack, T. Hilse, C. K. Hargrove, D. S. Koetke, Gunter Wolf, H. Ihssen, J. F. Kral, K. W. Bell, Max Weber, H. O. Ogren, Matthias Schröder, W. Gorn, D. Pitman, M. H. Lehto, Lorne Levinson, E. Lefebvre, Giora Mikenberg, Stefano Marcellini, M. F. Turner, P. Mättig, H. M. Bosch, Wolfram Dietrich Zeuner, James Letts, H. Lafoux, P. Igo-Kemenes, O. Runolfsson, S. W. Gensler, Christoph Geich-Gimbel, J. D. Gillies, J. C. Hill, N. Paz-Jaoshvili, B. W. Kennedy, M. J. Oreglia, E. Torrente-Lujan, J. Mildenberger, Gideon Bella, H. J. Burckhart, C. M. Hawkes, M. Cooper, Harold Nguyen, Gordon H. Hanson, Daniel Lellouch, S. J. Hillier, T. Kobayashi, J. Becker, A. Buijs, M. W. Redmond, R. Yaari, S. Bethke, C.J. Beeston, Jacqueline Batley, H. Jeremie, S. Wotton, Marco Cuffiani, B. C. Shen, R. E. Hughes-Jones, F. Odorici, D. M. Strom, C. Stegmann, Takehiko Mori, F. Scharf, Gregor Herten, G. J. VanDalen, James Pinfold, U. Maur, D. G. Fong, C. Wahl, Claudio Grandi, J. Kroll, D. J. Miller, D. M. Gingrich, A. K. Honma, J. Gascon, W. G. Scott, B. Wilkens, Tara Shears, A. Beaudoin, P. M. Hattersley, J. Goldberg, D. A. Hinshaw, D. E. Plane, H. von der Schmitt, R. Kowalewski, M. Morii, Peter R Hobson, F. X. Gentit, P. Bentkowski, J. E. Conboy, B. Nellen, S. L. Chu, V. Gibson, G. N. Patrick, A. Jawahery, M. J. Losty, P. Leblanc, J. E. Pilcher, G. M. Dallavalle, P. Berlich, J. W. Gary, P. Routenburg, M. J. Pearce, Horst Breuker, T. Behnke, M. Yurko, Margret Fincke-Keeler, R. Lahmann, P. W. Jeffreys, D. C. Imrie, E. do Couto e Silva, Otmar Biebel, G. E. Richards, Alan Watson, S. W. O'Neale, D. R. Rust, K. J. Anderson, G. A. Snow, D. J.P. Dumas, C. P. Ward, D. G. Charlton, D. L. Wagner, G. P. Siroli, Marcello Mannelli, J. E. Duboscq, J. Lauber, H. G. Evans, J. G. Layter, M. J. Goodrick, I. Cohen, M. Hauschild, J. King, I. J. Bloodworth, H. Deng, R. Humbert, P. S. Wells, J. M. Lorah, Christoph Schwick, Gideon Alexander, C. Markus, D. L. Rees, A. M. Lee, D. Axen, P. Bright-Thomas, Paolo Capiluppi, John Hobbs, H. Takeda, P. Poffenberger, P. Paschievici, M. Settles, W. Mohr, F. S. Merritt, A. Yeaman, M. Coupland, Peter Sherwood, N. K. Watson, Kiyotomo Kawagoe, F. G. Oakham, Norbert Wermes, M. Foucher, Sherry Towers, T. Kawamoto, R. W. Springer, Alexander Wagner, Sachio Komamiya, J. Hagemann, J. Ludwig, N. I. Geddes, K. Runge, B. Fabbro, B. Panzer-Steindel, R. J. Hemingway, R.J. Akers, P. Weber, M. Jones, Richard Keeler, G. W. Wilson, S. Orito, M. Rosvick, A. Skillman, M. A. Thomson, P. Scharff-Hansen, P. F. Harrison, D. Karlen, P. Bock, C. Burgard, E. Ros, A. Gaidot, P. Jovanovic, O. Schaile, J. A. McKenna, T. Wlodek, M. Sproston, Stephen Lloyd, M. Tecchio, Robert M Brown, T. P. Kokott, A. Luig, J. Banks, T. R. Wyatt, N. J. Tresilian, Austin Ball, D. Menszner, B. Boden, Claude Leroy, J. P. Pansart, N. Tesch, A. Dieckmann, R. J. Barlow, R. D. Heuer, H. Mes, I. P. Duerdoth, H. Przysiezniak, M. Fierro, Fabrizio Fabbri, D. Van den plas, A. M. Smith, Alessandro Montanari, B. Poli, Silvia Arcelli, G. Vasseur, B. Lorazo, P. Pfister, J. M. Roney, G. D. Lafferty, Madjid Boutemeur, P. G. Estabrooks, G. Giacomelli, G. T. Zorn, P. Schenk, P. M. Watkins, M. S. Dixit, Frans Meijers, P. E.L. Clarke, A. M. Rossi, T. Tsukamoto, J. P. Martin, H. M. Fischer, M. Hansroul, M. Sasaki, S. De Jong, A. Michelini, A. C. Janissen, C. H. Shepherd-Themistocleous, R. J. Homer, S. A. Robins, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, J. R. Carter, A. D. Schaile, V. H. Winterer, Randall Sobie, T. W. Pritchard, C. Jui, J. C. Clayton, S. Barnett, T. J. McMahon, D. Hochman, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, K. Stephens, J. R. McNutt, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, Roger Jones, R. Van Kooten, G. Quast, John Baines, M. G. Rison, J. von Krogh, Dave Robinson, D. R. Ward, G. Transtromer, and L. A. del Pozo
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Neutral current, Electron–positron annihilation, Physics beyond the Standard Model, High Energy Physics::Phenomenology, Hadron, Universality (dynamical systems), Nuclear physics, High Energy Physics::Experiment, Born approximation, Engineering (miscellaneous), Particle Physics - Experiment, Lepton
Abstract: We present an update with increased statistics to our published analysis of hadronic and leptonic cross sections and of the leptonic forward-backward asymmetries ine + e − collisions. The published results were based on a total 454 000 hadronic and 58 000 leptonic events. This analysis adds 733 000 hadronic and 88 000 leptonic events recorded at theZ 0 peak in 1992 by the OPAL experiment at LEP. A model independent analysis ofZ 0 parameters based on an extension of the improved Born approximation leads to tests of lepton universality and gives an interpretation of the results within the Standard Model framework. We also present a model independent test for new physics.
Published: 1993

46. A Determination of $\ alpha_{s}(M_{Z0})$ at LEP using Resummed QCD Calculations

Author: Gideon Bella, J. D. Gillies, A. Simon, H. J. Burckhart, Jacqueline Batley, P. A. Elcombe, Otmar Biebel, G. E. Richards, D. J. Miller, D. G. Charlton, D. L. Wagner, Phillip Allport, James Pinfold, M. Manelli, M. Morri, D. G. Fong, I. J. Bloodworth, H. Deng, R. Humbert, J. Gascon, H. von der Schmitt, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, D. A. Hinshaw, F. G. Oakham, M. Yurko, M. Settles, P. E.L. Clarke, P. W. Jeffreys, Gideon Alexander, Paolo Capiluppi, T. Kobayashi, C. Jui, J. Steuerer, M. Foucher, Norbert Wermes, A. M. Lee, P. M. Hattersley, W. R. Gibson, J. E. Duboscq, G. W. Wilson, T. Kawamoto, J. M. Roney, H. Przysierzniak, D. Karlen, S. Wotton, P. Singh, Ehud Duchovni, R. Shypit, Andris Skuja, P. Igo-Kemenes, G. Maringer, P. Bright-Thomas, Silvia Arcelli, J. K. Becker, D. Axen, C. M. Hawkes, A. Jawahery, M. Cooper, Daniel Lellouch, R. W. L. Jones, H. Ihssen, Tetsuro Mashimo, A. Beck, H. Jeremie, Kiyotomo Kawagoe, S. W. O'Neale, G. Tysarczyk-Niemeyer, G. A. Snow, C. P. Ward, W. J. Collins, S. Orito, M. Rosvick, D. L. Rees, Takehiko Mori, Peter Sherwood, J. M. Lorah, T. Behnke, E. Heflin, S. W. Gensler, S. J. Hillier, C. J. Virtue, B. Panzer-Steindel, R. E. Hughes-Jones, U. Maur, M. A. Thomson, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, G. J. Van Dalen, K. Runge, G. G. Hanson, P. Bock, W. Mohr, R. M. Brown, R. Mir, T. W. Pritchard, J. Goldberg, B. Nellen, Michael Dittmar, W. Gorn, Lorne Levinson, G. Giacomelli, R. Yaari, K. J. Anderson, P. Leblanc, P. S. Wells, V. Gibson, S. Bethke, Marco Cuffiani, Tohru Takeshita, G. Yekutieli, P. Schenk, E. do Couto e Silva, Shlomo Dado, G. A. Bahan, T. Hilse, S. Barnett, J. Allison, G. Duckeck, R. Ströhmer, M. Hansroul, P. Weber, P. F. Harrison, B. W. Kennedy, M. Jobes, U. Binder, O. Runolfsson, M. Hauschild, Gilles Beaudoin, A. D. Schaile, C. H. Shepherd-Themistocleous, P. D. Acton, M. S. Dixit, Terry Richard Wyatt, A. T. Watson, G. T. Zorn, C. Y. Chang, M. F. Turner, Frans Meijers, E. Torrente-Lujan, M. Tecchio, P. Scharff-Hansen, H. G. Evans, X. C. Lou, M. J. Goodrick, R. J. Homer, C. Markus, P. Paschievici, D. Hochman, N. J. Thackray, I. Cohen, Georges Azuelos, H. M. Bosch, S. L. Chu, A. A. Carter, M. Coupland, V. H. Winterer, Wolfram Dietrich Zeuner, P. Taras, Margret Fincke-Keeler, Claudio Grandi, A. Gaidot, M. Kuwano, T. Wlodek, Mitsuaki Nozaki, J. G. Layter, J. F. Kral, R. Van Kooten, K. W. Bell, F. C. Grant, M. J. Oreglia, M. Sproston, M. A. Whalley, R. Lahmann, D. C. Imrie, Max Weber, J. C. Clayton, Erez Etzion, D. E. Plane, A. M. Smith, P. Pfister, J. C. Hill, Stefan Kluth, P. Routenburg, N. Tesch, A. Dieckmann, B. C. Shen, Shlomit Tarem, P. Bentkowski, G. Vasseur, B. Lorazo, C. Wahl, John Hobbs, G. M. Dallavalle, P. Mättig, J. P. Martin, A. Buijs, G. P. Siroli, D. M. Strom, A. K. Honma, W. G. Scott, Christoph Schwick, G. N. Patrick, J. E. Pilcher, G. D. Lafferty, S. Rossberg, C. J. Oram, S. De Jong, J. W. Gary, R. J. Barlow, R. P. Middleton, D. J.P. Dumas, C. Moisan, J. P. Walker, R. Kowalewski, M. Fierro, P. Teixeira-Dias, T. J. Smith, K. Stephens, P. G. Estabrooks, R. K. Keeler, J. von Krogh, J. R. McNutt, M. Sasaki, M. J. Losty, Dave Robinson, P. M. Watkins, G. Quast, John Baines, C. Burgard, B. Schmitt, G. A. Beck, L. A. del Pozo, S. Schreiber, H. O. Ogren, Christoph Geich-Gimbel, T. J. McMahon, J. Schwiening, D. R. Ward, J. Kroll, G. Transtromer, R. K. Carnegie, S. L. Lloyd, F. X. Gentit, J. E. Conboy, J. A. Wilson, A. Pouladdej, R. J. Sobie, W. Schappert, F. S. Merritt, J. A. McKenna, R. F. McGowan, Claude Leroy, J. P. Pansart, J. Mildenberger, Harold Nguyen, N. I. Geddes, Paul Kyberd, F. K. Loebinger, M. W. Redmond, Horst Breuker, A. Rollnik, P. Poffenberger, R. Giacomelli, N. Paz-Jaoshvili, A. Astbury, O. Ganel, A. J. Martin, M. Jimack, C. K. Hargrove, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, H. Mes, I. P. Duerdoth, G. Mikenberg, O. Schaile, F. Odorici, J. Banks, N. J. Tresilian, T. Mouthuy, R. D. Heuer, A. Yeaman, Fabrizio Fabbri, N. K. Watson, D. Van den plas, Sachio Komamiya, E. Ros, D. R. Rust, T. P. Kokott, Carla Sbarra, Peter R Hobson, A. M. Rossi, D. Pitman, M. H. Lehto, T. Tsukamoto, T. G. Shears, S. Levegrün, P. Berlich, L. Köpke, B. Boden, B. Poli, H. M. Fischer, A. Michelini, A. C. Janissen, J. R. Carter, and J. Hart
Subjects: Physics, Quantum chromodynamics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Observable, Jet (particle physics), Resonance (particle physics), Nuclear physics, Renormalization, High Energy Physics::Experiment, Engineering (miscellaneous), Energy (signal processing), Particle Physics - Experiment
Abstract: The strong coupling constant, αs, has been determined in hadronic decays of theZ0 resonance, using measurements of seven observables relating to global event shapes, energy correlations and jet rates. The data have been compared with resummed QCD calculations, which are combined with theO(s2) theory. The seven measurements agree to about 10% and the final results, based on a weighted average, is: $$\alpha _s (M_{Z^0 } ) = 0.120 \pm 0.006,$$ where the error includes both experimental and theoretical uncertainties. This value corresponds to renormalization scale$\mu = M_{Z^0 } $ and the error includes the uncertainty in this choice of scale. The present measurement complements previous determinations using theO(s2) QCD matrix elements alone, and yields a compatible result, with comparable errors.
Published: 1993

47. A study of K$^{0}_{s}K^{0}_{s}$ Bose-Einstein correlations in hadronic $Z^{0}$ decays

Author: James Pinfold, A. D. Schaile, D. G. Fong, T. Mouthuy, J. Gascon, Silvia Arcelli, Tohru Takeshita, H. von der Schmitt, H. O. Ogren, Christoph Geich-Gimbel, F. S. Merritt, S. Schreiber, J. Kroll, F. X. Gentit, J. E. Conboy, A. Pouladdej, R. Van Kooten, D. Pitman, F. G. Oakham, J. A. McKenna, M. H. Lehto, P. S. Wells, Georges Azuelos, R. F. McGowan, P. E.L. Clarke, T. J. McMahon, P. Igo-Kemenes, V. H. Winterer, F. Lamarche, Terry Richard Wyatt, P. Singh, J. Schwiening, R. J. Hemingway, S. Bougerolle, J. F. Kral, K. W. Bell, G. Maringer, R. K. Carnegie, J. A. Wilson, H. Jeremie, R. E. Hughes-Jones, U. Maur, Max Weber, A. M. Rossi, P. Jovanovic, T. G. Shears, M. Coupland, J. C. Hill, R. Lahmann, Austin Ball, D. Menszner, F. C. Grant, Misao Sasaki, R. W. L. Jones, D. C. Imrie, W. Schappert, S. W. O'Neale, K. J. Anderson, K. Stephens, J. W. Gary, M. A. Whalley, T. Tsukamoto, S. Levegrün, J. Steuerer, J. M. Roney, Alessandro Montanari, B. C. Shen, N. Paz-Jaoshvili, Marcello Mannelli, J. E. Duboscq, B. Panzer-Steindel, E. do Couto e Silva, W. J. Collins, A. Buijs, G. A. Snow, C. P. Ward, D. M. Strom, C. Y. Chang, M. F. Turner, Randall Sobie, G. D. Lafferty, A. K. Honma, G. P. Siroli, J. R. McNutt, M. Jobes, D. L. Rees, P. Taras, J. Hart, P. Berlich, Mitsuaki Nozaki, N. I. Geddes, W. G. Scott, Christoph Schwick, U. Binder, L. Köpke, R. Mir, J. D. Gillies, Gideon Bella, P. G. Estabrooks, R. K. Keeler, Paul Kyberd, F. K. Loebinger, T. W. Pritchard, H. J. Burckhart, Jacqueline Batley, B. Boden, G. Beaudoin, Michael Dittmar, P. Scharff-Hansen, A. Gaidot, G. Yekutieli, R. Kowalewski, R. J. Barlow, H. Mes, B. Poli, D. J. Miller, R. Yaari, M. Kuwano, T. Wlodek, M. Hansroul, P. M. Watkins, I. P. Duerdoth, S. Bethke, A. A. Carter, Marco Cuffiani, M. Sproston, Shlomo Dado, P. Poffenberger, O. Schaile, M. J. Losty, M. W. Redmond, D. E. Plane, J. Banks, H. M. Fischer, Stephen Hillier, A. Michelini, X. C. Lou, A. C. Janissen, N. J. Tresilian, P. Routenburg, C. H. Shepherd-Themistocleous, P. Bentkowski, A. Rollnik, S. Weisz, V. Gibson, R. D. Heuer, N. Tesch, A. Dieckmann, G. M. Dallavalle, G. Quast, C. Jui, R. J. Homer, Fabrizio Fabbri, Giora Mikenberg, D. Van den plas, Ehud Duchovni, R. Shypit, John Baines, H. Przysiezniak, P. M. Hattersley, P. A. Elcombe, J. von Krogh, D. R. Rust, John Hobbs, Dave Robinson, Margret Fincke-Keeler, T. Hilse, Horst Breuker, H. Ihssen, S. W. Gensler, A. M. Smith, Kiyotomo Kawagoe, L. A. del Pozo, D. A. Hinshaw, D. J.P. Dumas, O. Runolfsson, M. Jimack, John Allison, J. Becker, M. J. Oreglia, D. R. Ward, Claude Leroy, M. Hauschild, G. Transtromer, G. J. VanDalen, T. Kobayashi, C. J. Virtue, P. Weber, G. Vasseur, Claudio Grandi, M. Yurko, P. W. Jeffreys, J. P. Pansart, W. R. Gibson, P. Pfister, C. Markus, P. Paschievici, A. M. Lee, A. Astbury, R. G. Kellogg, M. Morii, D. S. Koetke, B. Lorazo, O. Ganel, Stefano Marcellini, J. C. Clayton, T. Behnke, Peter R Hobson, P. Bright-Thomas, A. J. Martin, A. Beck, James Letts, M. A. Thomson, E. Heflin, R. M. Brown, Andris Skuja, Lorne Levinson, J. R. Carter, G. N. Patrick, Phillip Allport, F. Odorici, C. Moisan, J. P. Walker, J. Mildenberger, Harold Nguyen, A. Simon, B. W. Kennedy, Otmar Biebel, E. Torrente-Lujan, Sachio Komamiya, C. Wahl, C. K. Hargrove, G. E. Richards, D. G. Charlton, D. L. Wagner, P. Teixeira-Dias, J. M. Lorah, E. Ros, A. T. Watson, Tetsuro Mashimo, H. Deng, J. E. Pilcher, R. Humbert, W. Mohr, G. Duckeck, R. Ströhmer, B. Schmitt, T. P. Kokott, Carla Sbarra, G. T. Zorn, Norbert Wermes, T. Kawamoto, Gideon Alexander, W. Gorn, H. M. Bosch, G. A. Bahan, S. Orito, M. Rosvick, Paolo Capiluppi, P. Schenk, Wolfram Dietrich Zeuner, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, A. Yeaman, Peter Sherwood, N. K. Watson, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, P. F. Harrison, K. Runge, P. Bock, P. D. Acton, Stephen Lloyd, M. Tecchio, S. Barnett, D. Hochman, N. J. Thackray, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, I. J. Bloodworth, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, C. Burgard, T. J. Smith, P. Mättig, J. G. Layter, J. P. Martin, S. De Jong, Erez Etzion, Stefan Kluth, Shlomit Tarem, S. Rossberg, C. J. Oram, R. P. Middleton, J. Goldberg, B. Nellen, P. Leblanc, G. G. Hanson, H. G. Evans, G. Giacomelli, M. J. Goodrick, I. Cohen, E.J. Prebys, M. S. Dixit, S. Wotton, and Frans Meijers
Subjects: Hadronic decay, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Hadron, Four-momentum, High Energy Physics::Experiment, Bose–Einstein correlations, Radius, Scalar meson, Particle Physics - Experiment
Abstract: Bose-Einstein correlations in K0SK0S pairs have been studied for the first time in e+e− annihilations. These correlations were measured through the quantity Q, the four momentum difference of the pair. Out of about half a million Z0 hadronic decay events a total of about 6000 events with two or more identified K0S mesons were used for the analysis We observe a threshold enhancement in K0SK0S pairs originating from a mixed sample of K0 K 0 and K0K0 ( K 0 K 0 ) pairs. Although we can not presently exclude that a part of this effect is due to scalar meson decays, our analysis attributes the enhancement to Bose-Einstein correlations. We find the values for the strength of the effect and the radius of the K0S emitting source to be λ = 1.12 ± 0.33 ± 0.29 and R0 = (0.72 ± 0.17 ± 0.19) fm, respectively, where the first error is statistical and the second systematic.
Published: 1992

48. Evidence for the existence of the strange b-flavoured meson $B^{0}_{s}$ in $Z^{0}$ decays

Author: Margret Fincke-Keeler, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, J. P. Martin, F. S. Merritt, J. Goldberg, K. Stephens, Peter Sherwood, J. R. McNutt, J. C. Clayton, S. De Jong, B. Nellen, V. Gibson, G. Quast, John Baines, R. Van Kooten, D. Pitman, M. H. Lehto, D. R. Ward, G. Transtromer, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, F. C. Grant, M. A. Whalley, P. Leblanc, K. Runge, P. Bock, P. Pfister, P. F. Harrison, H. G. Evans, T. G. Shears, J. A. McKenna, P. D. Acton, Stephen Lloyd, P. G. Estabrooks, R. K. Keeler, M. J. Goodrick, I. Cohen, A. Buijs, A. Yeaman, M. Tecchio, R. F. McGowan, I. J. Bloodworth, Kiyotomo Kawagoe, N. Paz-Jaoshvili, W. R. Gibson, A. D. Schaile, Tohru Takeshita, Gideon Bella, H. J. Burckhart, Erez Etzion, F. Lamarche, Phillip Allport, Stefan Kluth, Jacqueline Batley, N. K. Watson, P. M. Watkins, P. Berlich, Shlomit Tarem, J. M. Roney, M. Settles, S. Barnett, A. Simon, Otmar Biebel, L. Köpke, H. Mes, D. Hochman, N. J. Thackray, A. Beck, V. H. Winterer, D. Strom, I. P. Duerdoth, E. Heflin, G. E. Richards, D. G. Charlton, D. L. Wagner, S. Rossberg, C. J. Oram, Georges Azuelos, M. Foucher, C. Moisan, J. P. Walker, H. O. Ogren, Christoph Geich-Gimbel, P. Weber, R. P. Middleton, R. J. Hemingway, H. Deng, R. Humbert, R. M. Brown, P. Teixeira-Dias, D. R. Rust, Lorne Levinson, J. F. Kral, K. W. Bell, Gideon Alexander, Paolo Capiluppi, P. Schenk, P. Lennert, J. Kroll, P. Poffenberger, Silvia Arcelli, B. W. Kennedy, F. X. Gentit, Max Weber, A. Gaidot, Claude Leroy, J. P. Pansart, G. W. Wilson, D. Karlen, C. Burgard, P. Jovanovic, M. Kuwano, J. E. Conboy, T. Wlodek, D. G. Fong, P. Singh, J. C. Hill, Misao Sasaki, W. J. Collins, M. Sproston, T. Kawamoto, J. Gascon, H. von der Schmitt, A. Pouladdej, B. C. Shen, Austin Ball, D. Menszner, Randall Sobie, G. D. Lafferty, R. W. L. Jones, S. Orito, M. Rosvick, D. E. Plane, R. Mir, Sachio Komamiya, P. Routenburg, A. K. Honma, Alessandro Montanari, W. G. Scott, Stephen Hillier, P. Le Du, T. W. Pritchard, E. Ros, A. T. Watson, J. W. Gary, J. Hart, N. Tesch, A. Dieckmann, B. Panzer-Steindel, G. M. Dallavalle, R. Kowalewski, Marcello Mannelli, J. E. Duboscq, M. J. Oreglia, P. Igo-Kemenes, G. Maringer, M. Hauschild, A. Astbury, M. Jobes, H. Jeremie, J. D. Gillies, R. E. Hughes-Jones, U. Maur, U. Binder, P. A. Elcombe, C. Markus, J. Banks, M. Hansroul, E. do Couto e Silva, P. Scharff-Hansen, M. J. Losty, P. Paschievici, J. R. Carter, T. P. Kokott, Carla Sbarra, G. N. Patrick, O. Ganel, N. J. Tresilian, S. Wotton, R. J. Barlow, A. J. Martin, S. Weisz, C. H. Shepherd-Themistocleous, G. Beaudoin, D. J.P. Dumas, R. D. Heuer, R. J. Homer, C. M. Hawkes, M. Cooper, Fabrizio Fabbri, John Hobbs, Daniel Lellouch, Shlomo Dado, A. M. Smith, P. E.L. Clarke, J. Steuerer, D. Van den plas, D. A. Hinshaw, G. Vasseur, X. C. Lou, M. F. Turner, Takehiko Mori, B. Lorazo, G. G. Hanson, D. L. Rees, R. Yaari, S. Bethke, Marco Cuffiani, J. Becker, C. Jui, G. Giacomelli, C. Wahl, C. K. Hargrove, G. J. VanDalen, J. von Krogh, D. C. Imrie, E.J. Prebys, C. P. Howarth, T. Behnke, N. Wermes, J. E. Pilcher, G. P. Siroli, M. S. Dixit, Ehud Duchovni, R. Shypit, Frans Meijers, H. Ihssen, C. Y. Chang, Christoph Schwick, Dave Robinson, P. Taras, Mitsuaki Nozaki, S. W. Gensler, M. Morii, S. W. O'Neale, Peter R Hobson, L. A. del Pozo, Andris Skuja, J. M. Lorah, Tetsuro Mashimo, J. G. Layter, W. Gorn, W. Mohr, T. J. Smith, G. A. Bahan, Michael Dittmar, Horst Breuker, P. M. Hattersley, G. Yekutieli, P. Mättig, D. J. Miller, F. G. Oakham, A. A. Carter, F. Odorici, O. Schaile, M. Yurko, P. S. Wells, G. Duckeck, P. W. Jeffreys, R. Ströhmer, A. M. Lee, Terry Richard Wyatt, G. T. Zorn, M. Coupland, H. M. Bosch, Wolfram Dietrich Zeuner, S. Schreiber, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, Paul Kyberd, F. K. Loebinger, M. W. Redmond, H. Przysiezniak, A. Rollnik, N. I. Geddes, T. Kobayashi, C. J. Virtue, B. Boden, B. Poli, J. Mildenberger, Harold Nguyen, H. M. Fischer, A. Michelini, A. C. Janissen, T. Hilse, O. Runolfsson, M. Jimack, John Allison, T. Mouthuy, Claudio Grandi, S. Bougerolle, Giora Mikenberg, R. G. Kellogg, A. M. Rossi, T. Tsukamoto, S. Levegrün, Stefano Marcellini, James Letts, G. A. Snow, C. P. Ward, and K. J. Anderson
Subjects: Quark, Semileptonic decay, Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Electron–positron annihilation, Hadron, Particle Physics - Experiment, Conjugate
Abstract: We present evidence for the existence of the strange b-flavoured meson Bs0 in a data sample of 470 628 hadronic Z0 decays recorded with the OPAL detector at LEP. A signal of 18.3±5.2 (stat.)±0.9(syst.) D s − l + pairs (or charge conjugate, l = e or l = μ ) is found after background subtraction, where the Ds meson is detected in the oπ and K∗0 K final states. Interpreting this signal as coming from the semileptonic decay B s 0 → D s − l + v X and combining t he two decay modes of the Ds, we find f ( b →B s 0 )B( B s 0 → D s − l + v X )B D s − →φ π − ) = [3.9±1.1 ( stat. )±0.8( syst. )]×10 −4 , where f ( b →B s 0 ) is the fraction of b quarks that results in a B0s meson in Z0 decays. This signal for the Bs0 is supported by our observation of an excess of 147 ± 48 inclusive Ds mesons in the φπ and K∗0K modes above the number expected from B0 and B+ decays and from the fragmentation of primary c quarks. In addition, a search is made for the exclusive decay Bs0→J/ψφ. Based on one candidate event the 90% confidence level upper limit is determined to be f ( b → B s 0 ) B ( B s 0 → J /ψφ) .
Published: 1992

49. A measurement of the forward-backward charge asymmetry in hadronic decays of the $Z^{0}$

Author: W. J. Collins, Randall Sobie, G. D. Lafferty, P. Singh, D. Axen, A. Jawahery, Silvia Arcelli, R. W. L. Jones, T. W. Pritchard, G. Tysarczyk-Niemeyer, P. Le Du, Peter Sherwood, R. Van Kooten, D. Pitman, B. Panzer-Steindel, C. Moisan, J. P. Walker, R. W. Springer, Alexander Wagner, M. H. Lehto, J. Goldberg, P. Teixeira-Dias, J. Hagemann, J. Ludwig, K. Runge, P. Bock, Paul Kyberd, F. K. Loebinger, B. Nellen, P. Leblanc, M. F. Turner, Kiyotomo Kawagoe, P. Poffenberger, M. W. Redmond, A. Rollnik, R. Mir, H. Przysiezniak, J. M. Roney, Tara Shears, J. P. Martin, John Hill, S. De Jong, Sachio Komamiya, P. Berlich, H. G. Evans, P. Weber, L. Köpke, Gideon Bella, H. J. Burckhart, Jacqueline Batley, P. Igo-Kemenes, B. C. Shen, F. S. Merritt, E. Ros, D. R. Rust, M. J. Goodrick, I. Cohen, G. Duckeck, R. Ströhmer, G. Maringer, M. Hansroul, H. Jeremie, P. Lennert, C. M. Hawkes, M. Cooper, Daniel Lellouch, Horst Breuker, J. Mildenberger, Harold Nguyen, C. H. Shepherd-Themistocleous, T. P. Kokott, Carla Sbarra, A. D. Schaile, M. J. Oreglia, R. E. Hughes-Jones, U. Maur, J. A. McKenna, V. H. Winterer, Takehiko Mori, A. K. Honma, H. M. Bosch, Wolfram Dietrich Zeuner, O. Schaile, E. do Couto e Silva, D. A. Hinshaw, G. G. Hanson, N. I. Geddes, R. J. Homer, Margret Fincke-Keeler, R. F. McGowan, J. R. Carter, G. N. Patrick, W. G. Scott, P. M. Hattersley, R. Kowalewski, B. Boden, F. Odorici, M. Jimack, S. Bougerolle, J. Hart, P. F. Harrison, T. Hilse, O. Runolfsson, D. G. Fong, J. Gascon, H. von der Schmitt, P. Pfister, B. Poli, P. G. Estabrooks, S. Wotton, G. Giacomelli, E.J. Prebys, H. O. Ogren, Christoph Geich-Gimbel, A. Simon, Otmar Biebel, J. D. Gillies, G. E. Richards, John Allison, M. Hauschild, M. J. Losty, Claudio Grandi, D. G. Charlton, D. L. Wagner, T. Behnke, P. M. Watkins, J. W. Gary, M. S. Dixit, Frans Meijers, P. D. Acton, M. Yurko, Stephen Lloyd, H. M. Fischer, C. Markus, H. Deng, R. Humbert, P. W. Jeffreys, A. Yeaman, N. Paz-Jaoshvili, J. Kroll, R. G. Kellogg, A. M. Lee, N. K. Watson, P. Paschievici, S. Barnett, Marcello Mannelli, J. E. Duboscq, A. Michelini, A. C. Janissen, D. C. Imrie, W. R. Gibson, F. X. Gentit, R. J. Barlow, J. Banks, C. Jui, N. J. Tresilian, J. E. Conboy, Stefano Marcellini, James Letts, Andris Skuja, M. Tecchio, G. P. Siroli, Christoph Schwick, Erez Etzion, S. Weisz, R. D. Heuer, T. Kawamoto, Fabrizio Fabbri, D. Van den plas, A. Pouladdej, H. Mes, I. P. Duerdoth, A. Astbury, J. G. Layter, Tetsuro Mashimo, D. Hochman, N. J. Thackray, Stefan Kluth, Shlomit Tarem, A. Beck, S. Orito, Tohru Takeshita, O. Ganel, E. Heflin, A. J. Martin, M. Rosvick, G. A. Snow, C. P. Ward, C. Wahl, T. Mouthuy, S. Rossberg, C. J. Oram, Georges Azuelos, W. Gorn, R. M. Brown, F. G. Oakham, S. W. O'Neale, C. P. Howarth, Peter R Hobson, J. F. Kral, K. W. Bell, Lorne Levinson, R. P. Middleton, J. E. Pilcher, G. T. Zorn, N. Wermes, Ehud Duchovni, B. W. Kennedy, G. A. Bahan, C. K. Hargrove, F. Lamarche, R. Shypit, T. J. Smith, Max Weber, M. Jobes, U. Binder, R. J. Hemingway, A. M. Rossi, Misao Sasaki, P. Scharff-Hansen, G. Beaudoin, J. C. Clayton, T. Tsukamoto, S. Levegrün, P. Jovanovic, Austin Ball, D. Menszner, P. Mättig, Alessandro Montanari, Shlomo Dado, D. E. Plane, A. M. Smith, Stephen Hillier, G. Vasseur, B. Lorazo, H. Ihssen, X. C. Lou, I. J. Bloodworth, G. M. Dallavalle, Giora Mikenberg, Alan Watson, S. W. Gensler, D. J.P. Dumas, T. Kobayashi, M. Settles, M. Foucher, C. J. Virtue, G. W. Wilson, D. Karlen, Phillip Allport, M. Morri, K. Stephens, J. R. McNutt, Gideon Alexander, Paolo Capiluppi, P. Schenk, V. Gibson, G. Quast, John Baines, D. R. Ward, G. Transtromer, D. J. Miller, S. Schreiber, P. S. Wells, T. J. McMahon, Terry Richard Wyatt, M. Coupland, J. Schwiening, R. K. Carnegie, Richard Keeler, J. A. Wilson, Claude Leroy, J. P. Pansart, F. C. Grant, M. A. Whalley, W. Schappert, A. Buijs, D. M. Strom, J. von Krogh, Dave Robinson, L. A. del Pozo, Michael Dittmar, G. Yekutieli, A. A. Carter, John Hobbs, P. E.L. Clarke, J. Steuerer, R. Yaari, S. Bethke, Marco Cuffiani, P. A. Elcombe, D. L. Rees, J. Becker, G. J. VanDalen, A. Gaidot, M. Kuwano, T. Wlodek, M. Sproston, P. Routenburg, N. Tesch, A. Dieckmann, J. M. Lorah, W. Mohr, K. J. Anderson, C. Y. Chang, P. Taras, and Mitsuaki Nozaki
Subjects: Physics, Quark, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, media_common.quotation_subject, Hadron, Charge (physics), Weinberg angle, Asymmetry, Standard Model, Nuclear physics, High Energy Physics::Experiment, Particle Physics - Experiment, media_common, Lepton
Abstract: We present a measurement of the forward-backward charge asymmetry in hadronic decays of the Z0 using data collected with the OPAL detector at LEP. The forward-backward charge asymmetry was measured using a weight function method which gave the number of forward events on a statistical basis. In a data sample of 448 942 hadronic Z0 decays, we have observed a charge asymmetry of Ah = 0.040±0.004 (stat.)±0.006 (syst.)±0.002 (B0 B 0 mix.), taking into account the effect of B0 B 0 mixing. In the framework of the standard model, this asymmetry corresponds to an effective weak mixing angle averaged over five quark flavours of sin 2 θ W = 0.2321 ± 0.0017 ( stat. ) ± 0.0027 ( syst. ) ± 0.0009 (B0 B 0 mix.). The result agrees with the value obtained from the Z0 line shape and lepton pair forward-backward asymmetry.
Published: 1992

50. Search for free gluons in hadronic $Z^{0}$ decays

Author: T. Mouthuy, Andris Skuja, B. C. Shen, Tetsuro Mashimo, J. M. Lorah, John Hobbs, W. Mohr, R. Mir, A. M. Rossi, H. E. Stier, Erez Etzion, P. G. Estabrooks, C. Moisan, J. P. Walker, T. Tsukamoto, S. Levegrün, W. G. Scott, H. Oh, D. A. Hinshaw, P. Teixeira-Dias, Gareth J. Barker, W. Gorn, P. Igo-Kemenes, G. A. Bahan, H. O. Ogren, G. Maringer, D. C. Imrie, Christoph Geich-Gimbel, M. M. Deninno, Shlomit Tarem, J. Kroll, F. X. Gentit, J. E. Conboy, M. Ogg, A. Pouladdej, K. Stephens, P. M. Watkins, P. E.L. Clarke, D. E. Plane, P. A. Elcombe, C. M. Hawkes, M. Cooper, H. Jeremie, Daniel Lellouch, J. Hart, T. Behnke, Stephen Hillier, R. E. Hughes-Jones, U. Maur, F. S. Merritt, R. Shypit, Takehiko Mori, G. M. Dallavalle, G. P. Siroli, R. Kowalewski, J. R. McNutt, S. Rossberg, R. G. Kellog, J. A. McKenna, R. F. McGowan, I. Wingerter, A. K. Honma, M. J. Oreglia, J. P. Martin, Alan Watson, V. Gibson, R. P. Middleton, M. J. Losty, D. L. Rees, John Hill, N. I. Geddes, J. Mildenberger, D. J.P. Dumas, Harold Nguyen, S. De Jong, F. Odorici, Silvia Arcelli, G. Quast, B. B. Brabson, C. Fukunaga, J. Becker, John Baines, M. Hansroul, B. Boden, E. Ros, B. Poli, D. G. Fong, G. Duckeck, R. Ströhmer, J. Gascon, H. von der Schmitt, G. J. VanDalen, W. R. Gibson, I. J. Bloodworth, D. R. Ward, C. Ho, J. R. Carter, H. M. Fischer, G. N. Patrick, D. Strom, G. Eckerlin, A. Michelini, P. Debu, R. J. Homer, G. T. Zorn, G. Transtromer, A. C. Janissen, J. W. Gary, H. M. Bosch, T. P. Kokott, Rene Brun, Wolfram Dietrich Zeuner, P. Singh, J. L. Pinfold, S. Wotton, T. R. Yaari, O. Runolfsson, S. Bethke, Marco Cuffiani, J. von Krogh, Marcello Mannelli, M. Jobes, U. Binder, M. Settles, S. A. Robins, N. C. Wood, P. Scharff-Hansen, R. W. L. Jones, M. Weymann, A. Beck, Y. Yang, E. Heflin, R. M. Brown, Lorne Levinson, J. G. Layter, M. W. Moss, Paul Kyberd, F. K. Loebinger, B. P. O'Neill, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, P. Le Du, H. Kreutzmann, B. W. Kennedy, S. Bougerolle, W. J. Collins, B. Panzer-Steindel, J. Banks, K. J. Anderson, P. F. Harrison, P. Ashton, Dave Robinson, Peter Sherwood, R. W. Springer, Alexander Wagner, J. Hagemann, J. Ludwig, G. D. Lafferty, Tohru Takeshita, P. D. Acton, P. Pfister, Stephen Lloyd, W. J. Larson, G. W. Wilson, D. Karlen, Claudio Grandi, K. Runge, P. Bock, F. Lamarche, A. Gaidot, M. Kuwano, M. Sproston, P. Routenburg, R. J. Hemingway, T. W. Pritchard, A. Dieckmann, Gideon Bella, H. J. Burckhart, S. Weisz, R. D. Heuer, Jacqueline Batley, P. M. Hattersley, L. A. del Pozo, C. Sbarra, M. W. Redmond, G. A. Snow, C. P. Ward, A. M. Smith, H. Mes, Georges Azuelos, S. Sanghera, B. Holl, P. Jovanovic, I. P. Duerdoth, G. Vasseur, N. Wermes, Michael Dittmar, Kiyotomo Kawagoe, Austin Ball, J. Goldberg, C. Y. Chang, Fabrizio Fabbri, D. Van den plas, B. Lorazo, G. Yekutieli, D. Menszner, A. Rollnik, J. F. Kral, K. W. Bell, G. Beaudoin, T. J. Smith, Max Weber, Ehud Duchovni, I. Zacharov, Alessandro Montanari, B. Nellen, P. Schenk, A. D. Schaile, P. Taras, Misao Sasaki, Horst Breuker, N. K. Watson, P. Leblanc, J. M. Roney, A. A. Carter, P. Mättig, H. Ihssen, M. Rosvick, D. R. Rust, Shlomo Dado, D. Pitman, Mitsuaki Nozaki, S. Komamiya, V. H. Winterer, P. Weber, G. G. Hanson, H. Takeda, X. C. Lou, R. Sobie, A. Astbury, P. Lennert, F. G. Oakham, S. W. Gensler, T. Kobayashi, S. R. Hou, Giora Mikenberg, O. Ganel, M. Jimack, M. J. Goodrick, H. Przysiezniak, John Allison, J. D. Gillies, A. J. Martin, S. Schreiber, T. J. McMahon, I. Cohen, S. W. O'Neale, Peter R Hobson, R. J. Barlow, M. Yurko, D. E. Klem, J. Schwiening, R. K. Carnegie, P. W. Jeffreys, G. Giacomelli, Phillip Allport, K. Riles, J. A. Wilson, R. Van Kooten, M. Fincke-Keeler, A. M. Lee, M. H. Lehto, E.J. Prebys, W. Schappert, C. K. Hargrove, C. J. Oram, M. S. Dixit, Frans Meijers, S. J. Pawley, P. Berlich, Gideon Alexander, Stefano Marcellini, Claus Kleinwort, L. Köpke, Paolo Capiluppi, James Letts, A. Simon, Otmar Biebel, D. G. Charlton, M. Couch, R. Humbert, T. Kawamoto, S. Orito, D. Hochman, N. J. Thackray, C. Wahl, C. P. Howarth, J. E. Pilcher, O. Schaile, M. Hauschild, P. Paschievici, D. J. Miller, P R Poffenberger, P. S. Wells, C. J. Virtue, M. Coupland, Richard Keeler, Claude Leroy, J. P. Pansart, F. C. Grant, M. A. Whalley, A. Buijs, and M. F. Turner
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Monte Carlo method, Hadron, Detector, High Energy Physics::Experiment, Lower limit, Particle Physics - Experiment, Gluon
Abstract: A search was performed for isolated, neutral, highly energetic particles which interact hadronically with matter. The data sample consists of 134 278 multihadronic events observed by the OPAL detector at LEP in e + e − collisions with centre-of-mass energies around the Z 0 pole. Our study is sensitive to events predicted by a model in which gluons appear as free, stable, particles. We observed two events and derive a lower limit at 95% confidence level of 47 GeV on the barrier height V m of a potential well introduced by this model. A Monte Carlo simulation of standard multihadronic Z 0 decays predicts 3.3 events.
Published: 1991

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