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1. A measurement of charged particle multiplicity in Z0 → cc̄ and Z0 → bb̄ events

Author: Gideon Bella, H. J. Burckhart, Jacqueline Batley, A. Buijs, D. M. Strom, Margret Fincke-Keeler, C. Stegmann, F. S. Merritt, M. Fanti, P. Igo-Kemenes, H. Fukui, H. Jeremie, R. E. Hughes-Jones, U. Maur, Xinchou Lou, W. Matthews, Reda Tafirout, J. A. McKenna, H. M. Fischer, E. do Couto e Silva, M. A. Thomson, M. W. Redmond, S. Braibant, A. Michelini, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, Gregor Herten, E. K. U. Gross, A. Gaidot, T. Wlodek, Silvia Arcelli, M. Sproston, Dave Charlton, B. Wilkens, D. E. Plane, G. A. Snow, C. P. Ward, D. L. Rees, M. J. Oreglia, R. Bartoldus, A. Yeaman, G. M. Dallavalle, R. Bürgin, B. Fabbro, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, R. D. Heuer, Fabrizio Fabbri, S. A. Robins, E. Lefebvre, H. O. Ogren, Christoph Geich-Gimbel, N. Tesch, S. Söldner-Rembold, T. P. Kokott, John Allison, A. Luig, R. W. Springer, P. S. Wells, Matthias Schröder, J. E. Pilcher, T. J. Smith, K. Stephens, C. Y. Chang, Terry Richard Wyatt, Tohru Takeshita, N. K. Watson, R. Van Kooten, F. Odorici, Erez Etzion, J. R. Carter, G. N. Patrick, N. J. Oldershaw, R. G. Kellogg, W. R. Gibson, R.J. Akers, R. Mir, Otmar Biebel, T. Hilse, Georges Azuelos, Stefan Kluth, F. X. Gentit, Barry King, D. L. Wagner, J. E. Conboy, A. Fürtjes, A. Beck, Shlomit Tarem, Shlomo Dado, Stefano Marcellini, T. G. Shears, E. Heflin, K. W. Bell, P. Taras, R. M. Brown, Lorne Levinson, H. Deng, I. J. Bloodworth, O. Schaile, O. Runolfsson, P. Gagnon, W. Mohr, P. D. Phillips, C. J. Oram, J. C. Hill, Gilles Beaudoin, W. P. Lai, Michael Kobel, Misao Sasaki, D. M. Gingrich, A. Skillman, J. Lauber, V. Gibson, B. C. Shen, B. Stockhausen, Paul Kyberd, M. Starks, F. K. Loebinger, A. M. Rossi, R. P. Middleton, A. I. McNab, Giora Mikenberg, Ehud Duchovni, T. Tsukamoto, P. Berlich, R. Howard, Siegfried Bethke, A. K. Honma, B. Nijjhar, J. Letts, Claude Leroy, J. Goldberg, W. G. Scott, H. Takeda, J. P. Pansart, P. A. Elcombe, Paolo Giacomelli, J. M. Roney, M. Settles, Norbert Wermes, Sherry Towers, C. Beeston, T. Kawamoto, M. Hansroul, B. Nellen, R. Giacomelli, D. R. Rust, F. G. Oakham, Claudio Grandi, Julie Kirk, M. Jimack, H. Lafoux, P. Leblanc, Yoram Rozen, G. W. Wilson, G. T. Zorn, M. Hauschild, S. Orito, M. Yurko, M. Rosvick, N. I. Geddes, M. J. Losty, E. L. Barberio, D. R. Ward, T. Kress, H. Mes, Madjid Boutemeur, I. P. Duerdoth, C. H. Shepherd-Themistocleous, C. Markus, P. W. Jeffreys, M. Foucher, A. M. Lee, P. Fath, N. L. Rodning, R. J. Homer, H. G. Evans, F. Scharf, F. Palmonari, B. Poli, M. J. Goodrick, P. A. Hart, I. Cohen, A. D. Schaile, P. G. Estabrooks, R. K. Keeler, D. Rigby, R. J. Hemingway, H. M. Bosch, Wolfram Dietrich Zeuner, M. J. Pearce, S. W. Gensler, G. A. Beck, Gunter Wolf, P. Bright-Thomas, Junichi Kanzaki, Achim Stahl, P. Teixeira-Dias, S. J. Hillier, B. W. Kennedy, D. Karlen, P. M. Watkins, C. Burgard, P. Poffenberger, P. Jovanovic, J. J. Ward, Austin Ball, P. Vikas, B. Schmitt, S. Wotton, D. Hochman, Peter Krieger, Peter Fischer, Manuella Vincter, Alessandro Montanari, U. Müller, P. Schütz, A. Posthaus, C. Dallapiccola, A. J. Martin, J. D. Gillies, R. J. Barlow, S. G. Clowes, D. J. Miller, M. Fierro, J. E.G. Edwards, C. Darling, C. K. Hargrove, O. Tousignant, P. Mättig, Shoji Asai, S. W. O'Neale, K. J. Anderson, C. M. Hawkes, Daniel Lellouch, T. Behnke, Takehiko Mori, Stephen Lloyd, M. Tecchio, V. Zacek, R. Kowalewski, Taizo Kobayashi, K. Ametewee, Gideon Alexander, Paolo Capiluppi, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, O. C. Cooke, P. Scharff-Hansen, Hans-Christian Schultz-Coulon, J. G. Layter, Randall Sobie, Michael Schulz, G. D. Lafferty, T. W. Pritchard, C. Charlesworth, N. Capdevielle, Guenter Duckeck, J. von Krogh, A. M. Smith, Dave Robinson, A. S. Turcot, G. Vasseur, B. Lorazo, R. Lahmann, D. C. Imrie, V. H. Winterer, L. A. del Pozo, James Pinfold, C. Sbarra, D. G. Fong, J. Gascon, G. P. Siroli, J. King, P. Szymanski, Michael Dittmar, Christoph Schwick, G. Yekutieli, J. W. Gary, D. S. Koetke, A. A. Carter, Marcello Mannelli, J. E. Duboscq, Ron Folman, Roger Jones, Andris Skuja, C. Jui, G. D. Long, Stan Bentvelsen, Tetsuro Mashimo, P. Utzat, W. Gorn, M. G. Rison, Kiyotomo Kawagoe, T. J. McMahon, G. G. Hanson, J. Schwiening, R. K. Carnegie, J. A. Wilson, P. Weber, G. Giacomelli, P. Schenk, J. Steuerer, M. S. Dixit, J. C. Clayton, Frans Meijers, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, J. P. Martin, M. Tscheulin, S. De Jong, H. Przysiezniak, Marco Cuffiani, and S. L. Chu
Subjects: Quantum chromodynamics, Physics, Quark, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, Multiplicity (mathematics), Bottom quark, Charged particle
Abstract: We have used data from the OPAL detector at LEP to reconstruct D∗ mesons and secondary vertices in jets. We have studied the hemispheres of the events opposite these jets and obtain values of the hemisphere charged particle multiplicity in Z0 → uu, dd, ss, Z0 → cc and Z0 → bb events of nuds = 10.41 ± 0.06 ± 0.09 ± 0.19; nc = 10.76 ± 0.20 ± 0.14 ± 0.19; nb = 11.81 ± 0.01 ± 0.12 ± 0.21 where the first errors are statistical, the second systmatic and the third a common scale uncertainty. We find the difference in total charged particle multiplicity between c and b quark events and light (u, d, s) quark events to be δcl = 0.69 ± 0.51 ± 0.35; δbl = 2.79 ± 0.12 ± 0.27. These results are compared to the predictions of various models and QCD based calculations.
Published: 1995
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2. 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
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3. 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
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4. 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
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5. 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
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6. A measurement of the production of D*± mesons on the Z0 resonance

Author: Otmar Biebel, Silvia Arcelli, D. G. Charlton, D. L. Wagner, H. Mes, I. P. Duerdoth, H. Deng, G. W. Wilson, M. Hauschild, C. Y. Chang, P. Fath, G. Herter, M. Yurko, Reda Tafirout, N. Capdevielle, J. von Krogh, S. L. Chu, P. W. Jeffreys, F. S. Merritt, C. Markus, J. Steuerer, Eilam Gross, Sachio Komamiya, Marco Cuffiani, Richard Keeler, P. Taras, Michael Kobel, Dave Robinson, L. A. del Pozo, P. Igo-Kemenes, Norbert Wermes, Sherry Towers, T. Kawamoto, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Theodoros Geralis, E. Ros, Shlomo Dado, W. R. Gibson, Matthias Schröder, T. J. McMahon, Margret Fincke-Keeler, P. Bright-Thomas, H. Jeremie, Gideon Bella, R. Howard, S. Orito, M. Rosvick, T. P. Kokott, J. Schwiening, A. Luig, Claude Leroy, N. K. Watson, R. E. Hughes-Jones, J. A. McKenna, U. Maur, R. K. Carnegie, M. Fanti, J. P. Pansart, A. Beck, J. J. Ward, P. Vikas, H. J. Burckhart, Jacqueline Batley, J. A. Wilson, Giora Mikenberg, A. Höcker, E. Heflin, E. do Couto e Silva, W. P. Lai, A. Astbury, Julie Kirk, H. Lafoux, R. Kowalewski, U. Müller, Lorne Levinson, S. Braibant, K. Stephens, A. Buijs, P. D. Phillips, I. J. Bloodworth, P. E.L. Clarke, D. M. Strom, U. C. Dunwoody, M. K. Jones, C. Stegmann, B. Wilkens, W. Mohr, J. P. Martin, Gilles Beaudoin, R. Bartoldus, E. Lefebvre, T. W. Pritchard, H. Fukui, J. E. Pilcher, R. Mir, M. J. Oreglia, J. M. Roney, K. Ametewee, A. Posthaus, M. Tscheulin, H. O. Ogren, Christoph Geich-Gimbel, C. K. Hargrove, F. Odorici, S. De Jong, C. Sbarra, R.J. Akers, Gideon Alexander, G. A. Snow, T. Hilse, C. P. Ward, Paolo Capiluppi, Tara Shears, P. Poffenberger, W. Matthews, J. Lauber, Peter Fischer, A. Yeaman, D. L. Rees, O. Schaile, S. Söldner-Rembold, Xinchou Lou, Michael Dittmar, O. Runolfsson, G. A. Beck, J. R. Carter, Yoram Rozen, G. Yekutieli, P. A. Hart, G. N. Patrick, A. Skillman, M. A. Thomson, Achim Stahl, D. E. Plane, Madjid Boutemeur, P. Teixeira-Dias, P. S. Wells, M. Starks, H. Takeda, V. Gibson, Terry Richard Wyatt, A. A. Carter, Ron Folman, P. Schütz, C. Beeston, Guenter Duckeck, Roger Jones, A. J. Martin, M. Foucher, M. J. Pearce, A. Gaidot, T. Wlodek, G. M. Dallavalle, Claudio Grandi, P. G. Estabrooks, M. Sproston, F. G. Oakham, B. Schmitt, F. X. Gentit, Z. Li, E. L. Barberio, P. Utzat, J. E. Conboy, A. Fürtjes, Junichi Kanzaki, M. G. Rison, D. R. Ward, T. Tsukamoto, N. Tesch, D. Karlen, T. Kress, Alan Watson, R. D. Heuer, Fabrizio Fabbri, P. M. Watkins, M. F. Turner-Watson, M. Morii, C. Burgard, Stephen Lloyd, P. A. Elcombe, D. Rigby, R. J. Hemingway, C. M. Hawkes, V. Zacck, Paolo Giacomelli, Daniel Lellouch, M. Tecchio, Robert M Brown, J. C. Clayton, M. Hansroul, Peter R Hobson, B. W. Kennedy, N. I. Geddes, R. Bürgin, P. Le Du, B. Fabbro, H. Przysiezniak, S. G. Clowes, M. Fierro, Takehiko Mori, F. Liu, D. R. Rust, C. H. Shepherd-Themistocleous, P. Jovanovic, Austin Ball, R. J. Homer, Ehud Duchovni, Peter Krieger, P. Schenk, P. Szymanski, G. Giacomelli, F. Scharf, Gordon H. Hanson, P. Routenburg, M. Jimack, A. D. Schaile, Manuella Vincter, Alessandro Montanari, M. S. Dixit, Frans Meijers, A. M. Lee, S. W. Gensler, C. Dallapiccola, J. G. Layter, J. D. Gillies, S. J. Hillier, D. Hochman, T. Kobayashi, C. Charlesworth, O. Tousignant, N. L. Rodning, R. J. Barlow, D. J. Miller, C. Darling, T. J. Smith, C. Jui, P. Mättig, Shoji Asai, S. W. O'Neale, B. Poli, M. W. Redmond, R. Van Kooten, D. Pitman, Stan Bentvelsen, K. J. Anderson, D. M. Gingrich, H. M. Fischer, A. S. Turcot, John Allison, P. Berlich, A. Michelini, V. H. Winterer, Kiyotomo Kawagoe, R. G. Kellogg, S. A. Robins, Stefano Marcellini, James Letts, P. Weber, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Giacomelli, R. Lahmann, D. C. Imrie, A. M. Rossi, G. P. Siroli, J. King, Christoph Schwick, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, James Pinfold, D. G. Fong, J. Gascon, P. Gagnon, G. T. Zorn, J. W. Gary, H. M. Bosch, D. S. Koetke, Wolfram Dietrich Zeuner, Marcello Mannelli, J. E. Duboscq, Andris Skuja, G. D. Long, Tetsuro Mashimo, T. Behnke, W. Gorn, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, J. Hagemann, J. Ludwig, M. Stettles, K. Runge, P. Bock, B. C. Shen, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, M. J. Losty, R. W. Springer, Tohru Takeshita, Georges Azuelos, Barry King, K. W. Bell, J. C. Hill, Misao Sasaki, A. I. McNab, J. Goldberg, B. Nellen, P. Leblanc, H. G. Evans, M. J. Goodrick, I. Cohen, Gunter Wolf, S. Wotton, Erez Etzion, Stefan Kluth, Shlomit Tarem, C. J. Oram, and R. P. Middleton
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, High Energy Physics::Lattice, Electron–positron annihilation, High Energy Physics::Phenomenology, Nuclear Theory, Elementary particle, Nuclear physics, High Energy Physics::Experiment, Multiplicity (chemistry), Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: We have studied the production of D*± mesons in a sample of 1.25 million multihadronic decays of the Z0, in which 1969 candidates have been identified. We have determined the total multiplicity of charged D* mesons in multihadronic Z0 decays to be
Published: 1995
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7. A test ofCP-invariance in Z0??+?? using optimal observables

Author: M. Yurko, R. Bartoldus, Madjid Boutemeur, A. Astbury, Gunter Wolf, F. X. Gentit, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, P. W. Jeffreys, C. Sbarra, U. Müller, J. P. Martin, M. Tscheulin, S. De Jong, H. Mes, H. O. Ogren, P. Szymanski, P. M. Matkins, C. M. Hawkes, R. Mir, N. K. Watson, Daniel Lellouch, I. P. Duerdoth, Michael Dittmar, J. G. Layter, Christoph Geich-Gimbel, C. Charlesworth, P. Igo-Kemenes, P. G. Estabrooks, R. K. Keeler, Takehiko Mori, R. Van Kooten, G. Yekutieli, P. Fath, C. Jui, Stan Bentvelsen, James Pinfold, H. M. Fischer, P. Bright-Thomas, Sachio Komamiya, H. Jeremie, J. Lauber, D. Pitman, W. Mohr, G. G. Hanson, R. E. Hughes-Jones, U. Maur, V. Zacek, A. A. Carter, Ron Folman, S. Wotton, F. Liu, D. G. Fong, G. Giacomelli, J. Gascon, P. Schenk, A. Posthaus, C. K. Hargrove, W. Matthews, Roger Jones, M. S. Dixit, Matthias Schröder, Frans Meijers, Hans-Christian Schultz-Coulon, S. L. Chu, J. J. Ward, J. E. Conboy, A. Fürtjes, P. Vikas, A. Michelini, A. Höcker, H. Takeda, A. Skillman, Theodoros Geralis, E. Ros, A. T. Watson, E. K. U. Gross, Randall Sobie, Michael Schulz, G. D. Lafferty, F. G. Oakham, P. Utzat, M. A. Thomson, I. J. Bloodworth, T. G. Shears, P. Gagnon, E. do Couto e Silva, T. Wlodek, D. E. Plane, M. Sproston, T. Tsukamoto, T. W. Pritchard, S. Braibant, M. G. Rison, E. L. Barberio, M. Settles, A. I. McNab, M. W. Redmond, R. Bürgin, P. Le Du, B. Fabbro, G. T. Zorn, N. Tesch, Yoram Rozen, J. W. Gary, D. S. Koetke, Guenter Duckeck, J. Goldberg, D. M. Gingrich, M. Foucher, H. M. Bosch, Wolfram Dietrich Zeuner, Marcello Mannelli, J. E. Duboscq, P. A. Elcombe, A. S. Turcot, C. Dallapiccola, B. Nellen, P. Leblanc, Gideon Bella, H. J. Burckhart, Jacqueline Batley, Ehud Duchovni, D. Axen, Junichi Kanzaki, D. Karlen, A. Jawahery, J. D. Gillies, E. Lefebvre, M. J. Oreglia, G. M. Dallavalle, G. A. Snow, C. P. Ward, C. Burgard, D. L. Rees, Silvia Arcelli, V. H. Winterer, F. S. Merritt, P. Berlich, M. Finke-Keeler, S. Söldner-Rembold, Peter Sherwood, F. Scharf, Alexander Wagner, M. Fanti, A. D. Schaile, F. Odorici, P. Scharff-Hansen, Paolo Giacomelli, H. G. Evans, M. Hansroul, J. Hagemann, J. Ludwig, N. Capdevielle, H. Przysiezniak, J. von Krogh, J. Steuerer, T. P. Kokott, K. Runge, P. Bock, M. J. Goodrick, I. Cohen, Xinchou Lou, C. Darling, S. G. Clowes, M. Fierro, R. J. Barlow, D. J. Miller, G. W. Wilson, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Shlomo Dado, M. Hauschild, M. Jimack, P. Mättig, A. Luig, P. A. Hart, Shoji Asai, Dave Robinson, J. R. Carter, G. N. Patrick, A. M. Smith, C. H. Shepherd-Themistocleous, Otmar Biebel, R. Howard, Claude Leroy, L. A. del Pozo, S. A. Robins, G. Vasseur, B. Lorazo, Erez Etzion, W. P. Lai, Stefan Kluth, T. Behnke, M. J. Pearce, T. J. McMahon, T. Hilse, R. D. Heuer, Giora Mikenberg, J. Schwiening, C. Markus, Fabrizio Fabbri, Andris Skuja, D. G. Charlton, D. L. Wagner, J. A. McKenna, Shlomit Tarem, D. Rigby, R. J. Hemingway, R. J. Homer, O. Runolfsson, R. K. Carnegie, W. R. Gibson, G. D. Long, Tetsuro Mashimo, J. M. Roney, C. J. Oram, B. W. Kennedy, J. A. Wilson, D. R. Rust, P. Jovanovic, H. Deng, C. Beeston, Austin Ball, R. Giacomelli, Claudio Grandi, Peter Krieger, R. P. Middleton, A. Beck, A. Buijs, D. M. Strom, W. Gorn, C. Stegmann, E. Heflin, Manuella Vincter, Alessandro Montanari, Marco Cuffiani, A. M. Lee, R. M. Brown, H. Fukui, Lorne Levinson, Norbert Wermes, P. D. Phillips, G. A. Beck, Achim Stahl, Gilles Beaudoin, S. W. Gensler, John Allison, Reda Tafirout, P. Teixeira-Dias, Sherry Towers, T. Kawamoto, S. J. Hillier, Gregor Herten, P. S. Wells, T. Kobayashi, B. Wilkens, Terry Richard Wyatt, R. G. Kellogg, J. P. Pansart, J. E. Pilcher, S. Orito, M. Rosvick, R.J. Akers, P. Poffenberger, Stefano Marcellini, O. Schaile, James Letts, B. Schmitt, Peter Fischer, M. Starks, A. J. Martin, P. Schütz, R. Kowalewski, A. Gaidot, K. Ametewee, Gideon Alexander, Paolo Capiluppi, A. Yeaman, A. M. Rossi, N. I. Geddes, O. Tousignant, N. L. Rodning, B. Poli, Stephen Lloyd, M. Tecchio, S. W. O'Neale, Z. Li, K. J. Anderson, M. F. Turner-Watson, M. Morii, Peter R Hobson, C. Y. Chang, P. Routenburg, B. C. Shen, P. Taras, Michael Kobel, Siegfried Bethke, Julie Kirk, H. Lafoux, A. K. Honma, B. Nijjhar, W. G. Scott, M. J. Losty, Kiyotomo Kawagoe, R. W. Springer, Tohru Takeshita, P. Weber, Georges Azuelos, Barry King, K. W. Bell, J. C. Hill, Misao Sasaki, R. Lahmann, D. C. Imrie, T. J. Smith, K. Stephens, G. P. Siroli, J. King, V. Gibson, Christoph Schwick, D. R. Ward, T. Kress, J. C. Clayton, and D. Hochman
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Neutral current, Electron–positron annihilation, Observable, Expectation value, Moment (mathematics), Dipole, Quantum electrodynamics, High Energy Physics::Experiment, Limit (mathematics), Spin (physics), Engineering (miscellaneous)
Abstract: Using 27 490 Z0→τ+τ− decays, accumulated in 1991, 1992 and 1993 with the OPAL detector at LEP, a direct test ofCP-invariance in the neutral current reactione+e−→τ+τ− is performed by measuringCP-odd observables which are proportional to the weak dipole moment of the τ-lepton. A new method based on optimalCP-odd observables constructed from the τ flight and spin directions is employed. More sensitive measurements of the real and, for the first time, the imaginary part of the weak dipole moment with highest possible signal to noise ratio are obtained. No evidence for a non-zero expectation value of the considered observables and hence forCP-violation is observed. An upper limit on the weak dipole moment of |Re(dτω)
Published: 1995
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8. 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
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9. The current status of B-physics at the Z0 peak and future prospects

Author: J. Hagemann, Gary John Barker, E. B. Martin, and Michael Dittmar
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Aleph, Particle physics, Bibliography, Current (fluid), Instrumentation, computer, Delphi, computer.programming_language
Abstract: The most recent b-physics results from ALEPH, DELPHI, L3 and OPAL are presented, covering b-production and b-decay studies plus a discussion of future b-physics at LEP.
Published: 1994
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10. Updated measurement of the τ lifetime

Author: R. Van Kooten, D. Pitman, M. H. Lehto, E. Lefebvre, S. L. Chu, T. G. Shears, F. Odorici, F. Liu, Margret Fincke-Keeler, D. M. Gingrich, G. Giacomelli, B. C. Shen, P. Schenk, P. Berlich, Siegfried Bethke, T. Hilse, A. K. Honma, B. Nijjhar, W. G. Scott, H. M. Fischer, M. S. Dixit, O. Runolfsson, J. Mildenberger, Gideon Bella, Frans Meijers, H. J. Burckhart, Gordon H. Hanson, Jacqueline Batley, C. M. Hawkes, Daniel Lellouch, A. Michelini, C. Beeston, M. Fanti, James Pinfold, Claudio Grandi, R. D. Heuer, M. J. Losty, Fabrizio Fabbri, P. Pfister, D. Van den plas, D. R. Rust, Takehiko Mori, P. Igo-Kemenes, F. S. Merritt, M. Yurko, D. G. Fong, M. W. Redmond, A. M. Lee, G. Beaudoin, J. Gascon, W. R. Gibson, H. Jeremie, H. von der Schmitt, P. W. Jeffreys, S. W. O'Neale, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, Xinchou Lou, S. A. Robins, H. Mes, R. E. Hughes-Jones, U. Maur, J. Steuerer, R.J. Akers, I. P. Duerdoth, A. Beck, E. Heflin, K. J. Anderson, J. P. Martin, J. W. Gary, M. J. Oreglia, Matthias Schröder, R. M. Brown, A. Höcker, Lorne Levinson, R. Lahmann, Silvia Arcelli, P. D. Phillips, J. A. McKenna, Tohru Takeshita, D. C. Imrie, P. Bright-Thomas, B. Stockhausen, Paul Kyberd, F. K. Loebinger, S. De Jong, Marcello Mannelli, J. E. Duboscq, Shlomo Dado, Sachio Komamiya, P. Poffenberger, E. do Couto e Silva, Georges Azuelos, Barry King, Peter Fischer, J. J. Ward, P. Scharff-Hansen, E. Barberio, Theodoros Geralis, D. A. Hinshaw, D. E. Plane, O. Schaile, K. W. Bell, E. Ros, A. T. Watson, Erez Etzion, G. P. Siroli, J. King, P. Schütz, M. A. Thomson, J. C. Hill, I. J. Bloodworth, P. Bentkowski, R. Bartoldus, C. Moisan, G. A. Beck, Marco Cuffiani, A. M. Smith, Christoph Schwick, G. M. Dallavalle, Achim Stahl, J. R. Carter, H. O. Ogren, Christoph Geich-Gimbel, Misao Sasaki, Stefan Kluth, Shlomit Tarem, G. N. Patrick, P. Teixeira-Dias, P. Le Du, B. Fabbro, M. Settles, G. Vasseur, B. Lorazo, Otmar Biebel, R. Giacomelli, T. Behnke, S. Rossberg, C. J. Oram, D. G. Charlton, D. L. Wagner, Kiyotomo Kawagoe, T. P. Kokott, A. Luig, Andris Skuja, Yoram Rozen, J. G. Layter, M. Foucher, Stephen Lloyd, G. D. Long, C. Y. Chang, B. Schmitt, H. Deng, R. Humbert, M. Tecchio, Tetsuro Mashimo, R. P. Middleton, C. Charlesworth, A. I. McNab, F. X. Gentit, J. E. Conboy, G. W. Wilson, A. Fürtjes, Michael Kobel, J. Goldberg, P. Weber, Gregor Herten, A. M. Rossi, H. Przysiezniak, D. Axen, A. Jawahery, Giora Mikenberg, D. Karlen, B. Nellen, W. Gorn, S. G. Clowes, C. Burgard, D. Hochman, P. A. Hart, B. Wilkens, P. Leblanc, T. Tsukamoto, Ehud Duchovni, Paolo Giacomelli, M. Hansroul, M. Fierro, H. Lafoux, T. J. Smith, K. Stephens, Peter Sherwood, M. Jimack, Z. Li, Norbert Wermes, Sherry Towers, Hans-Christian Schultz-Coulon, T. Kawamoto, A. Buijs, J. R. McNutt, M. J. Pearce, D. M. Strom, H. Ihssen, R. W. Springer, Alexander Wagner, J. Hagemann, C. H. Shepherd-Themistocleous, H. G. Evans, J. Ludwig, J. E. Pilcher, C. Dallapiccolla, S. W. Gensler, M. J. Goodrick, K. Runge, P. Bock, I. Cohen, John Allison, C. Darling, S. Orito, M. F. Turner-Watson, M. Morii, M. Rosvick, S. J. Hillier, R. J. Homer, T. Kobayashi, Randall Sobie, Peter R Hobson, S. Braibant, Gunter Wolf, M. Hauschild, P. Gagnon, C. Stegmann, N. I. Geddes, Michael Schulz, G. D. Lafferty, P. Routenburg, V. Gibson, R. Ströhmer, C. Markus, P. Mättig, Shoji Asai, G. T. Zorn, A. Astbury, U. Müller, S. Wotton, B. Poli, H. M. Bosch, R. Kowalewski, A. J. Martin, Wolfram Dietrich Zeuner, H. Fukui, A. Yeaman, P. D. Grannis, Gideon Alexander, J. M. Roney, R. G. Kellogg, Paolo Capiluppi, D. R. Ward, G. A. Snow, C. K. Hargrove, C. P. Ward, D. L. Rees, D. S. Koetke, J. C. Clayton, Stefano Marcellini, T. W. Pritchard, James Letts, Madjid Boutemeur, P. S. Wells, Guenter Duckeck, Terry Richard Wyatt, P. G. Estabrooks, R. K. Keeler, M. Coupland, P. M. Watkins, R. Howard, Claude Leroy, J. P. Pansart, V. H. Winterer, P. Szymanski, C. Jui, Stan Bentvelsen, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, J. von Krogh, J. Hart, Dave Robinson, J. D. Gillies, R. J. Barlow, D. J. Miller, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, N. K. Watson, Manuella Vincter, Alessandro Montanari, R. Mir, J. Lauber, H. Takeda, F. G. Oakham, W. Mohr, A. Posthaus, P. A. Elcombe, J. Becker, F. Scharf, A. D. Schaile, A. Skillman, E. K. U. Gross, A. Gaidot, T. Wlodek, M. Sproston, and N. Tesch
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Experiment, Particle Physics - Experiment, Charged particle, Lepton
Abstract: We present an update of our measurement of the τ lepton lifetime, using data taken during 1992 and 1993 with the OPAL detector at LEP. The lifetime is determined from analyses of the impact parameters of tracks from τ decays to a single charged particle, and the reconstructed decay lenghts from the τ decays to three charged particles. With the added statistics (which increase the τ pair event sample size by more than a factor of four over our 1990 and 1991 data sample), the updated lifetime measurement is: ττ = 288.8 ± 2.2 (stat) ± 1.4 (sys) fs. When combined with world-average measurements of the tau leptonic branching fractions (assuming e-μ universality), the ratio of charged-current couplings is: ( g τ g μ ) = 1.005 ± 0.007 , in agreement with the hypothesis of τ-μ charged-current universality.
Published: 1994
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11. 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
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12. Measurement of the time dependence of ↔ mixing using leptons and D∗± mesons

Author: Raimund Ströhmer, Madjid Boutemeur, Daniel Lellouch, P. Schütz, P. G. Estabrooks, R. K. Keeler, Takehiko Mori, M. Hauschild, S. A. Wotton, D. C. Imrie, B. Nijjhar, M. J. Pearce, Sachio Komamiya, Theodoros Geralis, T. Hilse, C. Markus, M. Sasaki, P. Paschievici, P. M. Watkins, J. C. Clayton, Margret Fincke-Keeler, U. Morii, T. P. Kokott, R. Bartoldus, J. W. Gary, H. O. Ogren, Christoph Geich-Gimbel, C. Y. Chang, Carla Sbarra, A. Luig, S. L. Lloyd, F. X. Gentit, J. E. Conboy, A. Fürtjes, M. Tecchio, F. S. Merritt, G. P. Siroli, J. King, P R Poffenberger, Claudio Grandi, Christoph Schwick, J. A. McKenna, Matthias Schröder, S. L. Chu, Gideon Bella, I. J. Bloodworth, James Pinfold, Michael Schulz, G. Duckeck, U. C. Dunwoody, Doug Gingrich, P.G. Bright-Thomas, A. H. Ball, Silvia Arcelli, A. Stahl, H. Lafoux, H. Mes, D. A. Hinshaw, J.A. Lauber, H. J. Burckhart, Jacqueline Batley, Z. Li, R.J. Akers, S. J. De Jong, Kiyotomo Kawagoe, D. G. Fong, T. W. Pritchard, M. Settles, J. von Krogh, P. Igo-Kemenes, M. F. Turner-Watson, A. P. Wagner, M. Coupland, Peter R Hobson, M. Foucher, P. Pfister, H. Jeremie, J. Schwiening, P.A. Hart, J. Gascon, J.P. Martin, T. R. Wyatt, R. E. Hughes-Jones, U. Maur, A. Astbury, A. Buijs, D. M. Strom, C. Stegmann, H. Przysiezniak, D. Hochman, H. von der Schmitt, R. J. Barlow, R. Kowalewski, U. Müller, V. Gibson, A. D. Schaile, E. do Couto e Silva, S. G. Clowes, G. W. Wilson, A. J. Martin, Erez Etzion, F. K. Loebinger, David Robinson, Stefan Kluth, M. Fierro, V. H. Winterer, S. W. O'Neale, Shlomit Tarem, J. Steuerer, H. Fukui, M. Yurko, P. W. Jeffreys, G. G. Hanson, P. Gagnon, T. J. Smith, K. Stephens, J. R. McNutt, S. Rossberg, A. Yeaman, T. Kobayashi, G. D. Lafferty, Shlomo Dado, C. J. Oram, P. D. Grannis, A. M. Lee, J. Allison, G. Giacomelli, Carsten Daniel Burgard, R. W. L. Jones, J. M. Roney, R. P. Middleton, Robert Lahmann, Gregor Herten, C. K. Hargrove, B. Poli, T. J. McMahon, A. I. McNab, M. W. Redmond, John Hart, P. Schenk, C. Wahl, B. Wilkens, K. J. Anderson, J. Goldberg, P. Le Du, B. Fabbro, T. Behnke, B. Nellen, G. T. Zorn, C. Darling, P. Kyberd, R. Yaari, Peter Sherwood, C. Jui, M. S. Dixit, Frans Meijers, R. Giacomelli, Marcello Mannelli, J. E. Duboscq, C. Moisan, Norbert Wermes, X. C. Lou, P. Leblanc, R. K. Carnegie, Gideon Alexander, H. M. Bosch, Marco Cuffiani, G. A. Beck, M. J. Kobel, Wolfram Dietrich Zeuner, Paolo Capiluppi, J. J. Ward, M. A. Thomson, Pedro Teixeira-Dias, J. E. Pilcher, P. Mättig, H. G. Evans, Shoji Asai, N. K. Watson, P. M. Hattersley, M. J. Goodrick, I. Cohen, J. G. Layter, J. A. Wilson, D. R. Ward, P. Scharff-Hansen, C. Charlesworth, P. E. L. Clarke, W. Mohr, M. Jimack, D. Axen, A. Jawahery, A. M. Rossi, A. Posthaus, T. Tsukamoto, Ehud Duchovni, A. M. Smith, H. M. Fischer, B. Schmitt, R. W. Springer, A. Michelini, Michael Dittmar, J. Hagemann, J. Ludwig, R. G. Kellogg, H-C. Schultz-Coulon, G. Vasseur, H. Ihssen, G. Yekutieli, B. Lorazo, D. S. Koetke, K. Runge, P. Bock, Stefano Marcellini, Andris Skuja, A. Skillman, S. A. Robins, J. K. Becker, G. A. Snow, S. W. Gensler, C. P. Ward, D. L. Rees, A. A. Carter, Ron Folman, James Letts, S. J. Hillier, G. D. Long, Tetsuro Mashimo, M. G. Rison, J. R. Carter, A. Gaidot, T. Wlodek, J. Mildenberger, M. Sproston, Paolo Giacomelli, M. Hansroul, W. Gorn, N. I. Geddes, P. S. Wells, M. Jones, A. T. Watson, P. Routenburg, N. Tesch, C. H. Shepherd-Themistocleous, R. J. Homer, P. A. Elcombe, R. J. Sobie, F. Scharf, R. Howard, Claude Leroy, Georges Azuelos, J. P. Pansart, C. M. Hawkes, K. W. Bell, J. C. Hill, B. C. Shen, Siegfried Bethke, W. G. Scott, P. Weber, Otmar Biebel, M. J. Losty, D. G. Charlton, H. Deng, R. Humbert, Sherry Towers, T. Kawamoto, E. Lefebvre, S. Orito, M. Rosvick, R. Van Kooten, F. Odorici, D. Pitman, M. J. Oreglia, M. H. Lehto, G. N. Patrick, C.J. Beeston, T. G. Shears, I. P. Duerdoth, Gy. Wolf, P. Berlich, D. Karlen, M. Fanti, O. Schaile, D. E. Plane, Fabrizio Fabbri, P. Bentkowski, D. Van den plas, G. M. Dallavalle, O. Runolfsson, D. R. Rust, Eduardo Ros, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, P. D. Phillips, B. W. Kennedy, Gilles Beaudoin, R. J. Hemingway, D.L. Wagner, P. Jovanovic, Manuella Vincter, Alessandro Montanari, C. Dallapiccola, G. Mikenberg, J. D. Gillies, A. K. Honma, D. J. Miller, R. Mir, H. Takeda, R. D. Heuer, and F. G. Oakham
Subjects: Systematic error, Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Oscillation, Electron–positron annihilation, Measure (mathematics), Mixing (physics), Lepton
Abstract: Data collected with the OPAL detector at LEP during 1990–1993 are used to measure the time dependence of B d 0 ↔ B d 0 mixing. From a sample of 153 ± 12 events with a charged D∗ and a lepton in the opposite hemisphere, we measure the B d 0 ↔ B d 0 oscillation frequency to be Δmd = 0.57±0.11(stat.)±0.02(syst.) ps−1. This corresponds to an oscillation parameter of xd = ΔmdτBd0 = 0.82±0.16(stat.) ± 0.03(syst.) ± 0.09(syst. τB0d), where the second systematic uncertainty is due to the error in the measured Bd0 lifetime.
Published: 1994
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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
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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
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15. Measurement of the time dependence of mixing using a jet charge technique

Author: W. R. Gibson, A. Beck, E. Heflin, P. S. Wells, R. M. Brown, Lorne Levinson, C. Y. Chang, M. F. Turner, James Pinfold, Terry Richard Wyatt, G. Beaudoin, D. G. Fong, R. Bartoldus, B. W. Kennedy, E. Torrente-Lujan, J. Gascon, H. von der Schmitt, N. K. Watson, Michael Kobel, Gregor Herten, M. Coupland, John Allison, Shlomo Dado, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, H. O. Ogren, C. Wahl, C. Sbarra, B. Wilkens, Christoph Geich-Gimbel, H. Lafoux, Paul Kyberd, Paolo Giacomelli, F. K. Loebinger, Otmar Biebel, M. Hansroul, N. J. Tresilian, A. Rollnik, R. Giacomelli, Michael Dittmar, R. J. Hemingway, J. W. Gary, G. E. Richards, Georges Azuelos, D. G. Charlton, D. L. Wagner, T. J. Smith, K. Stephens, G. Yekutieli, J. Kroll, R. D. Heuer, Marcello Mannelli, J. E. Duboscq, Fabrizio Fabbri, D. Van den plas, J. E. Pilcher, F. C. Grant, K. W. Bell, W. Mohr, J. Mildenberger, Giora Mikenberg, Harold Nguyen, F. X. Gentit, J. E. Conboy, A. Fürtjes, R. Van Kooten, D. Pitman, P. Jovanovic, M. W. Redmond, J. R. McNutt, A. A. Carter, Ron Folman, Roger Jones, H. Deng, R. Humbert, Kiyotomo Kawagoe, M. H. Lehto, T. G. Shears, P. Poffenberger, Gideon Bella, H. J. Burckhart, Jacqueline Batley, J. C. Hill, Misao Sasaki, H. Przysiezniak, Austin Ball, M. Fierro, G. G. Hanson, A. Buijs, D. M. Strom, C. Stegmann, S. L. Chu, I. J. Bloodworth, P. Scharff-Hansen, D. M. Gingrich, P. A. Elcombe, B. C. Shen, D. A. Hinshaw, C. H. Shepherd-Themistocleous, Manuella Vincter, Alessandro Montanari, P. Schütz, M. G. Rison, E. Lefebvre, R. J. Homer, D. E. Plane, H. Fukui, T. Hilse, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Siegfried Bethke, G. Giacomelli, J. Hart, F. S. Merritt, P. Berlich, M. Hauschild, A. K. Honma, A. M. Smith, F. Odorici, C. Dallapiccola, W. G. Scott, O. Runolfsson, P. Bentkowski, Sherry Towers, T. Kawamoto, T. J. McMahon, T. W. Pritchard, J. D. Gillies, G. M. Dallavalle, G. A. Snow, C. P. Ward, J. Becker, A. D. Schaile, G. Vasseur, B. Lorazo, C. Markus, D. R. Rust, P. Paschievici, V. Gibson, D. L. Rees, Xinchou Lou, Z. Li, J. Schwiening, G. Quast, C. Beeston, R. K. Carnegie, F. Scharf, P. Schenk, P. Weber, Claudio Grandi, M. Settles, C. Moisan, J. A. McKenna, G. J. VanDalen, G. A. Beck, P. F. Harrison, Andris Skuja, Achim Stahl, T. Behnke, M. Yurko, Guenter Duckeck, P. W. Jeffreys, M. J. Losty, J. A. Wilson, R. J. Barlow, S. Orito, M. Rosvick, D. J.P. Dumas, D. J. Miller, A. M. Lee, P. Teixeira-Dias, Stephen Lloyd, G. D. Long, M. S. Dixit, R. Mir, Tetsuro Mashimo, Frans Meijers, P. Bright-Thomas, A. Skillman, R.J. Akers, J. J. Ward, M. Tecchio, M. A. Thomson, A. Gaidot, D. R. Ward, P. Le Du, B. Fabbro, H. Mes, I. P. Duerdoth, T. Wlodek, M. Sproston, B. Schmitt, M. Morii, M. Foucher, D. Axen, C. Jui, P. E.L. Clarke, A. Jawahery, O. Schaile, R. Howard, M. K. Jones, J. Lauber, S. W. O'Neale, Margret Fincke-Keeler, A. M. Rossi, Peter R Hobson, Claude Leroy, S. Barnett, N. Wermes, W. Gorn, J. P. Pansart, J. P. Martin, N. Tesch, K. J. Anderson, D. Hochman, H. Takeda, V. H. Winterer, M. J. Oreglia, Peter Sherwood, R. W. Springer, Alexander Wagner, F. G. Oakham, T. Tsukamoto, P. Pfister, J. Hagemann, J. Ludwig, K. Runge, P. Bock, J. C. Clayton, J. R. Carter, G. N. Patrick, S. De Jong, P. Routenburg, J. Goldberg, J. von Krogh, B. Nellen, P. M. Hattersley, P. Leblanc, J. Steuerer, R. Ströhmer, N. I. Geddes, H. G. Evans, Dave Robinson, M. J. Goodrick, I. Cohen, G. T. Zorn, R. Lahmann, Gunter Wolf, L. A. del Pozo, B. Boden, B. Poli, D. C. Imrie, G. W. Wilson, H. M. Bosch, Wolfram Dietrich Zeuner, S. Wotton, R. Yaari, Madjid Boutemeur, Marco Cuffiani, H. M. Fischer, J. G. Layter, G. P. Siroli, J. King, Christoph Schwick, P. G. Estabrooks, Erez Etzion, R. K. Keeler, A. Yeaman, A. Michelini, Stefan Kluth, Shlomit Tarem, D. Karlen, C. Charlesworth, S. Rossberg, C. J. Oram, C. Burgard, R. P. Middleton, S. A. Robins, P. M. Watkins, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, Silvia Arcelli, T. P. Kokott, A. Luig, J. M. Roney, C. Darling, P. A. Hart, P. Igo-Kemenes, H. Jeremie, R. E. Hughes-Jones, U. Maur, P. Mättig, Shoji Asai, E. do Couto e Silva, M. J. Pearce, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, Ehud Duchovni, M. Jimack, H. Ihssen, S. W. Gensler, S. J. Hillier, T. Kobayashi, Matthias Schröder, R. Kowalewski, Gideon Alexander, Paolo Capiluppi, A. Astbury, U. Müller, A. J. Martin, and C. K. Hargrove
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Jet (fluid), Particle decay, Particle physics, Meson, Oscillation, Electron–positron annihilation, High Energy Physics::Experiment, Charge (physics), Electric charge, Lepton
Abstract: The observation and measurement of the time-dependence of B0d↔B0d mixing are described. The B0d meson is reconstructed in final states that contain a D∗− and an l+, where the b flavour of the B0d at decay time is tagged by the electric charge of the lepton. A new and efficient method, using a jet charge technique, is developed for identifying the b flavour of the produced B0d. From a sample of 556 D∗±l∓ candidates reconstructed in the OPAL data collected during 1990–1993, the B0d↔B0d oscillation frequency is measured to be Δmd = 0.508 ± 0.075 (stat) ±0.025(syst) ps−1 giving an oscillation parameter of χd = 0.73 ± 0.11 (stat) ±0.08 (syst), where 0.076 of the systematic error on χd arises from the uncertainty on the B0d lifetime.
Published: 1994
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16. 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 $$($) over bar b events, shows that the presence of heavy flavours does not contribute significantly to the observed effect.
Published: 1994
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17. Measurement of $$\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
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18. A measurement of the forward-backward asymmetry of $$e^ + e^ - \to c\bar c$$ and $$e^ + e^ - \to b\bar b$$ at centre of mass energies on and near theZ 0 peak usingD *± mesons

Author: T. J. Smith, K. Stephens, J. R. McNutt, G. Quast, John Baines, D. R. Ward, G. Transtromer, S. Barnett, D. Hochman, G. J. VanDalen, M. Rosvkck, J. C. Clayton, M. Yurko, Silvia Arcelli, S. A. Robins, R. Lahmann, F. S. Merritt, P. W. Jeffreys, Margret Fincke-Keeler, W. R. Gibson, D. C. Imrie, Matthias Schröder, Gunter Wolf, T. Kobayashi, H. Lafoux, N. Paz-Jaoshvili, P. Igo-Kemenes, D. A. Hinshaw, Gregor Herten, C. Wahl, B. Wilkens, P. E.L. Clarke, A. Beck, E. Heflin, G. P. Siroli, E. Lefebvre, J. P. Martin, S. L. Chu, J. King, Christoph Schwick, V. H. Winterer, S. Wotton, C. M. Hawkes, M. Cooper, Daniel Lellouch, Otmar Biebel, G. E. Richards, D. G. Charlton, D. L. Wagner, R. M. Brown, P. Bright-Thomas, H. Jeremie, Lorne Levinson, R. E. Hughes-Jones, U. Maur, A. Skillman, J. E. Pilcher, H. Deng, R. Humbert, J. Lauber, F. Odorici, S. De Jong, M. Morii, P. Pfister, Takehiko Mori, A. Gaidot, Georges Azuelos, Peter R Hobson, V. Gibson, R.J. Akers, B. Fabbro, B. W. Kennedy, Gilles Beaudoin, E. Torrente-Lujan, R. Bartoldus, T. Wlodek, M. Sproston, M. Sasaki, H. Takeda, E. do Couto e Silva, B. Boden, H. O. Ogren, B. Panzer-Steindel, R. G. Kellogg, J. Goldberg, P. Routenburg, J. Schneps, B. Poli, Kiyotomo Kawagoe, Norbert Wermes, J. F. Kral, Christoph Geich-Gimbel, Sherry Towers, T. Kawamoto, M. A. Thomson, G. A. Snow, C. P. Ward, F. G. Oakham, J. A. McKenna, D. S. Koetke, N. Tesch, A. Dieckmann, John Hobbs, K. W. Bell, B. Nellen, D. L. Rees, D. E. Plane, D. Axen, A. Jawahery, P. A. Elcombe, Max Weber, P. Leblanc, Stefano Marcellini, S. Orito, M. J. Pearce, Horst Breuker, J. Hart, P. Bentkowski, G. M. Dallavalle, Gideon Bella, Peter Sherwood, James Letts, J. C. Hill, B. C. Shen, R. Mir, G. D. Lafferty, J. Kroll, C. Moisan, J. Becker, R. W. Springer, Alexander Wagner, S. W. O'Neale, G. A. Beck, J. D. Gillies, H. J. Burckhart, H. Mes, I. P. Duerdoth, T. Takeeshita, J. Hagemann, S. L. Lloyd, F. X. Gentit, Jacqueline Batley, Madjid Boutemeur, Achim Stahl, A. Yeaman, H. G. Evans, A. K. Honma, W. G. Scott, J. Ludwig, K. Runge, P. Bock, J. Mildenberger, Harold Nguyen, P. Mättig, M. J. Goodrick, I. Cohen, D. J.P. Dumas, J. E. Conboy, A. Astbury, P. Teixeira-Dias, F. Scharf, J. Steuerer, J. W. Gary, Shlomo Dado, P. Weber, N. K. Watson, I. J. Bloodworth, C. Jui, P. F. Harrison, U. Müller, N. I. Geddes, A. J. Martin, Sachio Komamiya, D. J. Miller, M. Settles, G. G. Hanson, P. G. Estabrooks, G. Mikenberg, J. Allison, G. Duckeck, R. Ströhmer, M. Tecchio, M. J. Oreglia, M. W. Redmond, X. C. Lou, R. K. Keeler, E. Ros, M. Foucher, M. J. Losty, G. Giacomelli, B. Schmitt, G. T. Zorn, A. D. Schaile, T. Behnke, Erez Etzion, K. J. Anderson, G. W. Wilson, P. Schenk, Paul Kyberd, J. M. Roney, D. Karlen, R. Kowalewski, H. M. Bosch, C. K. Hargrove, Wolfram Dietrich Zeuner, T. P. Kokott, A. Luig, R. J. Barlow, C. Burgard, F. K. Loebinger, M. Hauschild, P. M. Watkins, R. Yaari, G. N. Patrick, Stefan Kluth, S. Bethke, Marco Cuffiani, M. S. Dixit, R. J. Hemingway, Shlomit Tarem, A. M. Rossi, Frans Meijers, J. M. Lorah, Gideon Alexander, H. Przysiezniak, Paolo Capiluppi, C. Markus, T. Tsukamoto, P. Paschievici, C. Y. Chang, H. M. Fischer, S. Rossberg, C. J. Oram, M. F. Turner, A. Rollnik, P. Poffenberger, R. Giacomelli, M. Fierro, A. Michelini, M. Hansroul, Ehud Duchovni, A. C. Janissen, R. P. Middleton, P. Jovanovic, J. G. Layter, M. Jimack, Austin Ball, H. Ihssen, D. Menszner, S. W. Gensler, Alessandro Montanari, S. J. Hillier, T. Hilse, C. H. Shepherd-Themistocleous, T. W. Pritchard, O. Runolfsson, J. R. Carter, R. J. Homer, James Pinfold, D. G. Fong, C. Beeston, Claudio Grandi, P. S. Wells, J. Gascon, H. von der Schmitt, Terry Richard Wyatt, A. T. Watson, M. Coupland, P. M. Hattersley, Marcello Mannelli, J. E. Duboscq, R. W.L. Jones, M. Jones, R. J. Sobie, P. Scharff-Hansen, Claude Leroy, A. M. Smith, J. P. Pansart, G. Vasseur, B. Lorazo, F. C. Grant, M. A. Whalley, Andris Skuja, A. Buijs, D. M. Strom, C. Stegmann, Tetsuro Mashimo, W. Gorn, J. von Krogh, Dave Robinson, L. A. del Pozo, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, R. Van Kooten, M. G. Rison, T. J. McMahon, W. Mohr, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, D. R. Rust, A. M. Lee, O. Schaile, J. Banks, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, D. Pitman, M. H. Lehto, T. G. Shears, D. M. Gingrich, and P. Berlich
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), Meson, media_common.quotation_subject, Electron–positron annihilation, Elementary particle, Asymmetry, Standard Model, Nuclear physics, Charm (quantum number), Engineering (miscellaneous), media_common, Bar (unit)
Abstract: A measurement is presented of the forwardbackward asymmetry of the processes$e^ + e^ + \to c\bar c$ and$e^ + e^ + \to b\bar b$ at centre of mass energies near 91 GeV. Decays of theZ0 into charm and bottom quarks are identified using 6507 chargedD* mesons, reconstructed in the decaysD*±→D0π±→(K∓π±)π±,D*±→D0π±→(K∓π±π0)π± andD*±→D0π±→(K∓π±π∓π±)π±. Thec quark asymmetry on theZ0 peak is measured to be $$A_{FB}^c = 0.052 \pm 0.028(stat.) \pm 0.012(sys.).$$ The energy dependence of the asymmetry has been investigated at energies close to theZ0 peak. Consistency with the predictions of the Standard Model is found.
Published: 1993
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19. 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
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20. A test of the flavour independence of the strong interaction for five flavours

Author: James Pinfold, D. G. Fong, J. Gascon, H. von der Schmitt, J. W. Gary, Marcello Mannelli, J. E. Duboscq, Andris Skuja, Tetsuro Mashimo, W. Gorn, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, P. A. Elcombe, G. Beaudoin, Tohru Takeshita, Gregor Herten, Gideon Bella, J. Becker, Sachio Komamiya, Otmar Biebel, C. Wahl, P. M. Hattersley, B. Wilkens, H. J. Burckhart, Georges Azuelos, P. Igo-Kemenes, F. C. Grant, D. G. Charlton, D. L. Wagner, M. A. Whalley, F. Scharf, Jacqueline Batley, K. Stephens, E. Ros, A. T. Watson, Shlomo Dado, Madjid Boutemeur, J. F. Kral, J. R. McNutt, F. S. Merritt, H. Mes, K. W. Bell, I. P. Duerdoth, Max Weber, J. E. Pilcher, R. Lahmann, J. C. Hill, D. C. Imrie, H. Deng, R. Humbert, X. C. Lou, H. Jeremie, Misao Sasaki, B. C. Shen, M. Hansroul, C. Y. Chang, N. I. Geddes, R.J. Akers, Giora Mikenberg, G. P. Siroli, J. King, A. K. Honma, R. E. Hughes-Jones, A. Buijs, U. Maur, D. M. Strom, Christoph Schwick, W. R. Gibson, P. G. Estabrooks, W. G. Scott, B. Boden, M. F. Turner, O. Schaile, B. Poli, T. P. Kokott, C. Stegmann, A. Luig, J. M. Lorah, R. K. Keeler, V. Gibson, J. A. McKenna, Norbert Wermes, A. Beck, Sherry Towers, T. Kawamoto, G. Quast, R. Kowalewski, E. Heflin, R. M. Brown, Kiyotomo Kawagoe, E. do Couto e Silva, W. Mohr, Lorne Levinson, John Baines, M. J. Losty, R. Bartoldus, P. M. Watkins, G. A. Snow, C. P. Ward, D. L. Rees, C. H. Shepherd-Themistocleous, R. J. Homer, B. W. Kennedy, E. Torrente-Lujan, A. Skillman, P. Weber, A. Gaidot, S. Orito, M. Rosvick, R. Mir, H. Przysiezniak, H. O. Ogren, Christoph Geich-Gimbel, M. Hauschild, D. E. Plane, Margret Fincke-Keeler, M. Fierro, D. R. Ward, G. Transtromer, T. Wlodek, G. T. Zorn, M. Sproston, C. Markus, P. Paschievici, P. Bentkowski, G. M. Dallavalle, Silvia Arcelli, Matthias Schröder, G. J. VanDDalen, B. Fabbro, N. Tesch, A. Dieckmann, E. Lefebvre, P. Poffenberger, J. Banks, M. J. Oreglia, J. Kroll, J. C. Clayton, B. Panzer-Steindel, A. M. Rossi, P. Pfister, F. Odorici, T. Hilse, F. X. Gentit, H. Lafoux, D. J.P. Dumas, T. Tsukamoto, H. M. Fischer, N. Paz-Jaoshvili, N. J. Tresilian, O. Runolfsson, P. S. Wells, A. Michelini, A. C. Janissen, M. Mori, J. R. Carter, G. N. Patrick, Terry Richard Wyatt, Peter R Hobson, C. Beeston, R. D. Heuer, M. Coupland, C. Moisan, Claudio Grandi, Gideon Alexander, P. Routenburg, M. Yurko, G. A. Beck, Fabrizio Fabbri, J. M. Roney, A. Astbury, S. A. Robins, P. W. Jeffreys, Paolo Capiluppi, Achim Stahl, P. Teixeira-Dias, D. Van den plas, U. Müller, M. Jones, A. J. Martin, B. Schmitt, D. Pitman, P. Bright-Thomas, G. Giacomelli, J. Hart, S. W. O'Neale, K. J. Anderson, M. H. Lehto, G. Yukutieli, J. D. Gillies, P. Ma:attig, M. A. Thomson, P. Schenk, A. Yeaman, S. Barnett, J. von Krogh, T. G. Shears, Claude Leroy, N. K. Watson, J. Steuerer, R. J. Barlow, D. Hochman, J. P. Pansart, C. K. Hargrove, M. S. Dixit, D. J. Miller, Frans Meijers, D. M. Gingrich, Dave Robinson, P. F. Harrison, P. E.L. Clarke, M. J. Pearce, Horst Breuker, Stephen Lloyd, J. P. Martin, L. A. del Pozo, C. Sbarra, P. Berlich, J. Lauber, R. Yaari, M. Tecchio, S. Bethke, S. De Jong, Marco Cuffiani, H. Takeda, F. G. Oakham, Michael Dittmar, D. R. Rust, S. L. Chu, Ehud Duchovni, R. J. Hemingway, Erez Etzion, M. Jimack, P. Jovanovic, H. Ihssen, Austin Ball, D. Menszner, A. M. Lee, Stefan Kluth, Shlomit Tarem, J. G. Layter, John Hobbs, Alessandro Montanari, J. E. Conboy, A. A. Carter, S. W. Gensler, S. J. Hillier, Roger Jones, T. Kobayashi, D. Axen, A. Jawahery, R. Van Kooten, S. Rossberg, C. J. Oram, Peter Sherwood, R. W. Springer, Alexander Wagner, M. G. Rison, J. Hagemann, R. P. Middleton, J. Ludwig, K. Runge, P. Bock, Gunter Wolf, T. J. McMahon, G. Duckeck, R. Ströhmer, J. Schwiening, R. K. Carnegie, H. M. Bosch, Wolfram Dietrich Zeuner, J. A. Wilson, S. Wotton, W. Schappert, D. A. Hinshaw, J. Goldberg, T. Behnke, B. Nellen, P. Leblanc, H. G. Evans, M. J. Goodrick, I. Cohen, Randall Sobie, G. D. Lafferty, T. W. Pritchard, A. D. Schaile, V. H. Winterer, G. E. Richard, C. Jui, C. M. Hawkes, M. Cooper, Daniel Lellouch, I. J. Bloodworth, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, C. Burgard, J. Mildenberger, Harold Nguyen, T. J. Smith, Gordon H. Hanson, M. W. Redmond, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, Paul Kyberd, F. K. Loebinger, A. Rollnik, and R. Giacomelli
Subjects: Quark, Physics, Strange quark, Particle physics, Muon, Annihilation, Physics and Astronomy (miscellaneous), Meson, High Energy Physics::Lattice, High Energy Physics::Phenomenology, Strong interaction, Charge (physics), High Energy Physics::Experiment, Production (computer science), Engineering (miscellaneous), Particle Physics - Experiment
Abstract: We report on a measurement of the ratio of the strong coupling constants$\alpha _s (M_{Z^0 } )$ for various data samples with different quark flavour compositions obtained frome+e− annihilation at LEP. We select events with muons, electrons, andD*± mesons from charm and bottom decays, events with highly energeticKs0 mesons originating predominantly from strange quarks, and events with highly energetic stable charged particles from a combination of up, down and strange quarks. From the jet production rates in these events we obtain from these samples the relative value of αs for the individual quark flavours as $$\begin{gathered} \frac{{\alpha _s^b }}{{\alpha _s^{udsc} }} = 1.017 \pm 0.036,\frac{{\alpha _s^c }}{{\alpha _s^{udsb} }} = 0.918 \pm 0.115, \hfill \\ \frac{{\alpha _s^s }}{{\alpha _s^{udcb} }} = 1.158 \pm 0.164,\frac{{\alpha _s^{uds} }}{{\alpha _s^{cb} }} = 1.038 \pm 0.221, \hfill \\ \end{gathered}$$ with quadratically combined statistical and systematic errors. We also compare the αs values for quarks of diffrent weak isospin, charge and generation. No evidence for a dependence of αs on any of these quark properties is observed. Finally, combining all samples and determining the αsf/αsincl ratio for each flavour, we do not find any dependence of the strong coupling constant on flavour.
Published: 1993
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21. Search for massive, unstable photinos that violate R parity

Author: R. Bartoldus, C. Y. Chang, M. F. Turner, H. O. Ogren, S. W. O'Neale, K. J. Anderson, B. C. Shen, Christoph Geich-Gimbel, M. Yurko, G. Beaudoin, P. Poffenberger, James Pinfold, C. Moisan, G. A. Beck, H. Mes, I. P. Duerdoth, Erez Etzion, D. Axen, A. Jawahery, Silvia Arcelli, D. G. Fong, J. Gascon, H. von der Schmitt, A. K. Honma, P. W. Jeffreys, Stefan Kluth, M. Jones, Richard Keeler, Shlomit Tarem, Gideon Bella, W. G. Scott, G. Giacomelli, G. T. Zorn, Shlomo Dado, S. L. Chu, R. Kowalewski, Otmar Biebel, Peter Sherwood, G. E. Richards, J. Hart, T. J. Smith, Achim Stahl, P. Teixeira-Dias, R. W. Springer, Alexander Wagner, J. D. Gillies, R.J. Akers, B. Schmitt, J. W. Gary, H. J. Burckhart, Jacqueline Batley, J. C. Clayton, R. J. Barlow, J. Kroll, P. Schenk, O. Schaile, J. Hagemann, J. Ludwig, K. Runge, P. Bock, P. Igo-Kemenes, A. M. Rossi, T. Tsukamoto, S. Levegrün, Marcello Mannelli, J. E. Duboscq, P. Bright-Thomas, H. Jeremie, D. J. Miller, S. Rossberg, C. J. Oram, M. J. Losty, F. X. Gentit, X. C. Lou, Giora Mikenberg, C. Jui, J. E. Conboy, D. G. Charlton, D. L. Wagner, M. S. Dixit, Frans Meijers, P. Mättig, Claude Leroy, J. P. Pansart, U. Maur, I. J. Bloodworth, R. P. Middleton, H. Deng, R. Humbert, N. I. Geddes, A. Pouladdej, F. Odorici, R. Lahmann, J. G. Layter, M. Hansroul, P. Scharff-Hansen, D. A. Hinshaw, D. C. Imrie, J. Goldberg, B. Boden, B. Poli, Gregor Herten, J. M. Roney, M. Settles, Norbert Wermes, A. D. Schaile, Sherry Towers, T. Kawamoto, B. Nellen, F. S. Merritt, C. Wahl, M. Morii, E. do Couto e Silva, M. Foucher, C. H. Shepherd-Themistocleous, Tohru Takeshita, H. M. Fischer, G. A. Snow, B. Wilkens, C. P. Ward, A. M. Smith, H. Takeda, P. Leblanc, John Hobbs, Peter R Hobson, S. Orito, M. Rosvick, R. J. Homer, A. Michelini, A. C. Janissen, D. L. Rees, F. G. Oakham, Madjid Boutemeur, G. W. Wilson, V. H. Winterer, T. Behnke, R. Mir, G. P. Siroli, Georges Azuelos, G. Vasseur, Margret Fincke-Keeler, B. Lorazo, J. E. Pilcher, D. Karlen, C. Burgard, H. Przysiezniak, Andris Skuja, Christoph Schwick, F. Lamarche, P. G. Estabrooks, C. M. Hawkes, M. Cooper, Daniel Lellouch, S. A. Robins, M. Fierro, J. F. Kral, K. W. Bell, J. P. Martin, R. J. Hemingway, J. A. McKenna, M. Hauschild, Tetsuro Mashimo, Takehiko Mori, P. Pfister, P. E.L. Clarke, P. S. Wells, P. M. Watkins, H. G. Evans, S. Barnett, M. J. Oreglia, J. Steuerer, S. De Jong, Max Weber, P. Jovanovic, Austin Ball, M. J. Goodrick, D. Menszner, T. Hilse, Randall Sobie, I. Cohen, G. D. Lafferty, Terry Richard Wyatt, O. Runolfsson, W. Gorn, B. Fabbro, A. Yeaman, B. Panzer-Steindel, J. C. Hill, N. K. Watson, Misao Sasaki, Alessandro Montanari, J. R. Carter, T. W. Pritchard, G. N. Patrick, C. Beeston, M. Coupland, Claudio Grandi, D. Hochman, Sachio Komamiya, Gideon Alexander, Paolo Capiluppi, E. Ros, Gunter Wolf, F. C. Grant, M. A. Whalley, P. M. Hattersley, T. P. Kokott, A. Luig, R. Yaari, S. Bethke, Marco Cuffiani, A. Buijs, D. M. Strom, C. Stegmann, K. Stephens, Kiyotomo Kawagoe, P. F. Harrison, J. R. McNutt, P. D. Acton, Stephen Lloyd, M. Tecchio, Ehud Duchovni, S. Wotton, M. Jimack, P. Weber, H. Ihssen, S. W. Gensler, S. J. Hillier, T. Kobayashi, G. Duckeck, R. Ströhmer, C. J. Virtue, V. Gibson, G. Quast, John Baines, H. M. Bosch, Wolfram Dietrich Zeuner, D. R. Ward, G. Transtromer, A. Astbury, U. Müller, A. J. Martin, Paul Kyberd, F. K. Loebinger, A. Rollnik, R. Giacomelli, John Allison, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, James Letts, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, M. W. Redmond, C. K. Hargrove, Matthias Schröder, H. Lafoux, N. Paz-Jaoshvili, Tara Shears, M. J. Pearce, Horst Breuker, C. Markus, P. Paschievici, D. Pitman, M. H. Lehto, D. M. Gingrich, P. Berlich, L. Köpke, D. R. Rust, A. M. Lee, J. Banks, N. J. Tresilian, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, D. E. Plane, P. Bentkowski, G. M. Dallavalle, Alan Watson, D. J.P. Dumas, W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, E. Torrente-Lujan, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, Roger Jones, R. Van Kooten, R. E. Hughes-Jones, J. von Krogh, Dave Robinson, L. A. del Pozo, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, W. Schappert, A. Skillman, M. A. Thomson, A. Gaidot, M. Kuwano, T. Wlodek, M. Sproston, P. Routenburg, N. Tesch, A. Dieckmann, P. A. Elcombe, J. Becker, G. J. VanDalen, J. M. Lorah, and W. Mohr
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Magnetic moment, Solar neutrino, High Energy Physics::Phenomenology, Supersymmetry, Parameter space, lcsh:QC1-999, Nuclear physics, R-parity, High Energy Physics::Experiment, Neutrino, Photino, Particle Physics - Experiment, lcsh:Physics, Lepton
Abstract: A search for unstable, massive photinos pair produced in e + e − collisions has been performed using the OPAL detector at LEP. The data sample corresponds to an integrated luminosity of 21 pb −1 collected at center-of-mass energies near the Z 0 resonance. The unstable photino is assumed to decay into τ ± / gn l ( l = e or μ ) final states, thereby violating individual lepton numbers and R parity. This search is inspired by a particular model of supersymmetry which is of interest within the context of solar neutrino experiments because it allows for a large neutrino magnetic moment. The present search excludes a large portion of the parameter space allowed by the model.
Published: 1993

22. 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
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23. 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
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24. 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
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25. 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
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26. 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
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27. 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
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28. A study of the electric charge distributions of quark and gluon jets in hadronic Z0 decays

Author: T. W. Pritchard, D. E. Plane, J. Gascon, J. A. Wilson, Horst Breuker, K. Stephens, G. Yekutieli, R. Giacomelli, H. M. Bosch, S. Levegrün, M. Cuffiani, A. Jawahery, D. J. Miller, Tohru Takeshita, M. A. Thomson, I. Cohen, R. F. McGowan, Alan Watson, J. P. Walker, A. M. Rossi, Richard Keeler, J. Mildenberger, M. Weber, I. J. Bloodworth, R. Mir, G. D. Lafferty, R. W. Springer, John Carter, John Hobbs, D. J.P. Dumas, M. Jimack, M. Kuwano, P. Bright-Thomas, P. Kyberd, J. P. Pansart, J. F. Kral, J. Allison, J. Steuerer, D. Karlen, T. Wlodek, R. J. Hemingway, C. J. Oram, A. Gaidot, Gideon Bella, W. R. Gibson, S. W. O'Neale, H. J. Burckhart, P. M. Hattersley, A. Wagner, H. Przysiezniak, F. C. Grant, J. Hagemann, O. Runolfsson, R. Ströhmer, D. C. Imrie, S. Wotton, D. A. Hinshaw, B. Panzer-Steindel, E. Ros, R. J. Homer, J. Hart, A. Astbury, J. P. Martin, A. Rollnik, U. Maur, H. Mes, K. Runge, S. Kluth, G. Vasseur, W. Gorn, D. Hochman, P. Mättig, Carla Sbarra, P. Igo-Kemenes, R. D. Heuer, P. Berlich, B. C. Shen, R. W.L. Jones, J. C. Hill, J. D. Gillies, J. R. Batley, T. J. McMahon, M. A. Whalley, P. Bentkowski, P. A. Elcombe, J. C. Clayton, T. Kawamoto, T. Hilse, J. Pinfold, P. G. Estabrooks, N. Paz-Jaoshvili, D. Van den plas, T. Tsukamoto, A. Beck, D. Menszner, John Baines, J. Becker, G. G. Hanson, P. S. Wells, C. Geich-Gimbel, R. G. Kellogg, G. P. Siroli, J. M. Lorah, G. Transtromer, G. Alexander, A. Pouladdej, Phillip Allport, D. Lellouch, J. Letts, S. Orito, G. J. VanDalen, T. Behnke, Andris Skuja, J. Kroll, M. Dittmar, C. K. Hargrove, D. S. Koetke, G. Maringer, D. R. Ward, V. H. Winterer, R. M. Brown, P. M. Watkins, U. Binder, M. Yurko, T. R. Wyatt, R. J. Barlow, A. M. Lee, M. J. Oreglia, G. T. Zorn, M. Hansroul, B. Nellen, P. Taras, C. Moisan, J. Goldberg, O. Biebel, R. Sobie, S. Bethke, C. Burgard, P. Bock, A. Buijs, C. Schwick, G. Mikenberg, M. Sasaki, N. I. Geddes, T. P. Kokott, L. Levinson, P. Singh, D. M. Strom, S. Tarem, A. Dieckmann, C. J. Virtue, N. J. Tresilian, F. G. Oakham, D. R. Rust, A. A. Carter, T. Mashimo, A. J. Martin, R. P. Middleton, F. S. Merritt, J. E. Pilcher, T. J. Smith, F. X. Gentit, Austin Ball, K. J. Anderson, W. J. Collins, W. Schappert, S. Barnett, Maurice Goodrick, Paolo Capiluppi, E. Heflin, N. K. Watson, C. P. Ward, F. Lamarche, M. Nozaki, B. Schmitt, R. E. Hughes-Jones, G. W. Wilson, P. Poffenberger, O. Ganel, P. Routenburg, C. Wahl, B. Lorazo, J. W. Gary, Harold Nguyen, H. G. Evans, A. D. Schaile, C. Grandi, T. Mori, P. Weber, E. do Couto e Silva, L. Köpke, D. G. Charlton, D. L. Wagner, P. Teixeira-Dias, T. Kobayashi, G. Quast, G. Duckeck, G. Azuelos, W. G. Scott, J. A. McKenna, M. Hauschild, M. S. Dixit, A. Montanari, E. Torrente-Lujan, J. Ludwig, S. De Jong, Wolfram Dietrich Zeuner, H. Deng, S. Marcellini, C. M. Hawkes, J. Schwiening, C. Y. Chang, M. F. Turner, X. C. Lou, P. D. Acton, Stephen Lloyd, M. J. Losty, P. Scharff-Hansen, D. Axen, R. Yaari, P. Pfister, F. Odorici, E. Etzion, M. Rosvick, S. Arcelli, M. Tecchio, M. Coupland, P. Sherwood, G. A. Beck, C. Markus, G. Giacomelli, J. R. McNutt, A. Simon, P. Jovanovic, M. Cooper, H. M. Fischer, S. Rossberg, P. W. Jeffreys, M. Fincke-Keeler, A. M. Smith, H. O. Ogren, M. Settles, M. W. Redmond, R. Shypit, R. Kowalewski, O. Schaile, M. Sproston, G. N. Patrick, K. W. Bell, G. A. Bahan, S. W. Gensler, F. K. Loebinger, B. Poli, S. J. Hillier, M. H. Lehto, J. E. Conboy, P. E.L. Clarke, M. Fierro, D. G. Fong, H. von der Schmitt, H. Jeremie, J. G. Layter, N. Wermes, I. P. Duerdoth, A. Michelini, M. Foucher, P. Leblanc, M. Jobes, Marcello Mannelli, J. E. Duboscq, N. J. Thackray, B. W. Kennedy, T. Mouthuy, P. Paschievici, A. C. Janissen, J. M. Roney, R. Lahmann, H. Ihssen, A. Yeaman, S. Dado, A. K. Honma, S. Komamiya, P. R. Hobson, W. Mohr, Frans Meijers, R. Humbert, J. Banks, P. Schenk, E. Duchovni, G. A. Snow, D. L. Rees, C. Leroy, S. L. Chu, S. Schreiber, V. Gibson, C. Jui, G. Tysarczyk-Niemeyer, K. Kawagoe, P. F. Harrison, R. K. Carnegie, B. Boden, G. M. Dallavalle, J. von Krogh, C. H. Shepherd-Themistocleous, Dave Robinson, N. Tesch, L. A. del Pozo, G. Beaudoin, D. Pitman, G. E. Richards, R. Van Kooten, Franco Luigi Fabbri, and Tara Shears
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Charge conservation, High Energy Physics::Lattice, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, Charge (physics), Jet (particle physics), Bottom quark, Electric charge, Gluon, Nuclear physics, High Energy Physics::Experiment, Particle Physics - Experiment, Lepton
Abstract: A sample of three-jet events containing a lepton with high momentum and transverse momentum is selected from hadronic decays of the Z0. The presence of the lepton indicates the semi-leptonic decay of a bottom quark and allows us, in combination with energy ordering of the jets, to distinguish between quark and gluon jets. The sign of the lepton charge is used to identify jets originating from positively and negatively charged quarks, for the jets with the lepton and for the high energy jets. Defining the jet charge by summing the charge of the particles assigned to a jet, it is observed that the mean jet charge of the quark jets is incompatible with zero and that the sign of the jet charge corresponds to that expected from the charge of the primary quark. In contrast, the mean charge of the gluon jets is consistent with zero.
Published: 1993
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29. 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
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30. Performance of the OPAL jet chamber

Author: P. Igo-Kemenes, S. Schreiber, Horst Breuker, A. Rollnik, T. Behnke, A. Dieckmann, R. Van Kooten, C. Wahl, S. Levegrün, W. Mohr, H. von der Schmitt, E.J. Prebys, M. Hauschild, M. Hansroul, Otmar Biebel, B. Boden, G. Eckerlin, O. Schaile, G. Tysarczyk-Niemeyer, R. D. Heuer, U. Binder, R. Kowalewski, P. Bock, H. M. Bosch, J. Hagemann, and E. Ros
Subjects: Physics, Nuclear and High Energy Physics, Jet (fluid), Particle physics, Physics::Instrumentation and Detectors, Hadron, Charged particle, law.invention, Nuclear physics, Momentum, law, Calibration, Particle, Specific energy, High Energy Physics::Experiment, Detectors and Experimental Techniques, Collider, Instrumentation
Abstract: The jet chamber of the OPAL experiment at the LEP e + e − collider is designed to measure the direction and the momentum of charged particles as well as the specific energy loss in the chamber gas. The jet chamber has been operated at LEP since August 1989 and has recorded 500 000 hadronic decays of the Z 0 , resulting in a good understanding of the stability and systematics of the chamber. Resolutions obtained in the measurement of particle direction, momentum, and specific energy loss are presented, as well as the corrections and calibration procedures necessary to attain original design goals. A momentum resolution of 6.8% for particles with a momentum of 45 GeV/ c and an energy loss resolution of 3–4% over all momenta have been achieved.
Published: 1992
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31. 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
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32. 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
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33. 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
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34. 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
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35. 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
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36. The detector simulation program for the OPAL experiment at LEP

Author: C. Y. Chang, Kiyotomo Kawagoe, R. W. L. Jones, H. Kreutzmann, D. Hochman, Michael Dittmar, A. D. Schaile, R. Yaari, A. M. Rossi, K. Riles, V. Gibson, J. Gascon, M. Hansroul, Roger Barlow, G. Quast, John Hart, A. Buijs, G. M. Dallavalle, Tatsuo Kawamoto, M. W. Redmond, J. W. Gary, Rene Brun, P. Routenburg, J. E. Conboy, D. R. Ward, M. L. Luvisetto, B. Lorazo, G. D. Lafferty, P. M. Hattersley, J. R. Batley, P. Mättig, B. W. Kennedy, Tetsuro Mashimo, C. P. Ward, D. L. Rees, P. M. Watkins, C. Fukunaga, J. Mildenberger, Colin Roach, S. W. Gensler, G. W. Wilson, R. J. Hemingway, M. Hauschild, Daniel Lellouch, F.F. Heymann, S. W. O'Neale, Peter R Hobson, P. Pfister, G. Tysarczyk-Niemeyer, R. Hospes, J. Hagemann, John Allison, G. J. Van Dalen, P. Zanarini, W. J. Murray, E.J. Prebys, P. F. Harrison, M. J. Oreglia, N. K. Watson, R. Kowalewski, G. N. Patrick, Otmar Biebel, M. J. Losty, R. Cranfield, J. G. Layter, S. L. Llyod, J. J. Dumont, A. C. McPherson, N. I. Geddes, J. Banks, S. Weisz, F. W. Bullock, R. Van Kooten, S. J. Pawley, L. Köpke, J. D. Gillies, and A. Possoz
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Detector, Detectors and Experimental Techniques, Instrumentation, Bhabha scattering
Published: 1992
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37. 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
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38. Test of CP-invariance in e+e−→Z0→τ+τ− and a limit on the weak dipole moment of the τ lepton

Author: D. J. Miller, B. B. Brabson, C. M. Hawkes, M. Cooper, Silvia Arcelli, Daniel Lellouch, Takehiko Mori, D. G. Fong, J. Gascon, Gideon Bella, H. von der Schmitt, H. J. Burckhart, Jacqueline Batley, P. S. Wells, C. J. Virtue, R. Mir, H. Oh, D. Axen, A. Jawahery, Terry Richard Wyatt, G. Beaudoin, T. Mouthuy, P. Singh, R. W. L. Jones, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, M. Coupland, N. K. Watson, B. P. O'Neill, R. Van Kooten, P. E.L. Clarke, P. G. Estabrooks, R. K. Keeler, M. Hansroul, G. Tysarczyk-Niemeyer, J. W. Gary, F. C. Grant, M. A. Whalley, D. Pitman, M. H. Lehto, S. Wotton, P. M. Watkins, Marcello Mannelli, Shlomo Dado, Sachio Komamiya, M. Yurko, E. Ros, A. T. Watson, P. W. Jeffreys, Peter Sherwood, M. J. Oreglia, Phillip Allport, M. Jimack, John Allison, A. Buijs, B. C. Shen, R. W. Springer, Alexander Wagner, P. Igo-Kemenes, G. Maringer, R. J. Homer, I. Wingerter, M. W. Moss, T. P. Kokott, Rene Brun, T. J. Smith, H. O. Ogren, Christoph Geich-Gimbel, U. Biebel, A. M. Rossi, H. Jeremie, Andris Skuja, X. C. Lou, A. M. Lee, P. Mättig, J. Hagemann, S. J. Pawley, R. E. Hughes-Jones, U. Maur, J. Ludwig, A. K. Honma, A. Astbury, M. M. Deninno, K. Runge, P. Bock, O. Ganel, P. Berlich, L. Köpke, Tetsuro Mashimo, T. Tsukamoto, S. Levegrün, Giora Mikenberg, J. Kroll, J. M. Lorah, F. Odorici, R. G. Kellogg, A. J. Martin, W. G. Scott, E. do Couto e Silva, K. Riles, P. M. Hattersley, W. Mohr, I. J. Bloodworth, F. X. Gentit, H. M. Fischer, C. Moisan, J. R. Carter, D. C. Imrie, G. N. Patrick, J. P. Walker, S. Bougerolle, J. E. Conboy, M. Ogg, A. Michelini, M. Settles, C. Fukunaga, A. C. Janissen, R. Kowalewski, Stefano Marcellini, A. Pouladdej, J. Banks, R. Yaari, James Letts, S. Weisz, S. W. O'Neale, Peter R Hobson, P. Teixeira-Dias, F. Lamarche, A. Simon, S. Bethke, F. S. Merritt, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, Marco Cuffiani, W. Gorn, Horst Breuker, G. P. Siroli, Erez Etzion, G. W. Wilson, Gareth J. Barker, G. A. Bahan, D. Karlen, D. R. Rust, M. Jobes, D. G. Charlton, D. L. Wagner, U. Binder, S. A. Robins, M. J. Losty, G. A. Snow, C. P. Ward, R. J. Hemingway, Claude Leroy, J. Mildenberger, C. Wahl, Harold Nguyen, Gideon Alexander, P. Lennert, J. P. Pansart, D. A. Hinshaw, Shlomit Tarem, A. Gaidot, J. A. McKenna, M. Kuwano, T. Wlodek, M. Couch, P. Scharff-Hansen, M. Sproston, W. J. Larson, R. F. McGowan, R. Humbert, Paolo Capiluppi, P. Schenk, H. Mes, I. P. Duerdoth, Kiyotomo Kawagoe, A. M. Smith, A. Dieckmann, John Hobbs, T. Behnke, Margret Fincke-Keeler, C. P. Howarth, G. Vasseur, B. Lorazo, S. Rossberg, W. R. Gibson, P. Routenberg, C. J. Oram, N. I. Geddes, P. Jovanovic, Tohru Takeshita, Paul Kyberd, F. K. Loebinger, J. M. Roney, Austin Ball, N. Wermes, P. A. Elcombe, R. P. Middleton, W. J. Collins, T. Kawamoto, C. K. Hangrove, Georges Azuelos, J. E. Pilcher, G. Duckeck, R. Ströhmer, B. Boden, C. Ho, M. W. Redmond, B. Poli, J. Goldberg, D. Strom, P. Weber, G. T. Zorn, Randall Sobie, G. D. Lafferty, A. Rollnik, D. Menszner, D. L. Rees, J. Becker, J. F. Kral, B. Nellen, Claudio Grandi, K. W. Bell, S. Orito, H. M. Bosch, Wolfram Dietrich Zeuner, Max Weber, M. Rosvick, P. Leblanc, G. J. VanDalen, J. C. Hill, Misao Sasaki, A. Beck, H. G. Evans, M. J. Goodrick, T. W. Pritchard, I. Cohen, E. Heflin, Ehud Duchovni, R. Shypit, R. M. Brown, Alessandro Montanari, Lorne Levinson, A. D. Schaile, B. W. Kennedy, V. H. Winterer, H. Ihssen, O. Runolfsson, J. D. Gillies, O. Schaile, S. R. Hou, D. E. Plane, R. J. Barlow, Stephen Hillier, G. M. Dallavalle, S. W. Gensler, M. Hauschild, D. J.P. Dumas, T. Kobayashi, P. Paschievici, H. Takeda, F. G. Oakham, J. Hart, J. von Krogh, P. Ashton, Dave Robinson, L. A. del Pozo, S. Schreiber, T. J. McMahon, Y. Yang, J. Schwiening, R. K. Carnegie, P. F. Harrison, J. A. Wilson, P. D. Acton, Stephen Lloyd, W. Schappert, Michael Dittmar, H. Przysiezniak, G. Yekutieli, A. A. Carter, P. Pfister, K. J. Anderson, C. Y. Chang, P. Taras, D. E. Klem, M. F. Turner, P. Poffenberger, D. Hochman, N. J. Thackray, K. Stephens, J. R. McNutt, V. Gibson, G. Quast, John Baines, D. R. Ward, G. Transtromer, G. G. Hanson, G. Giacomelli, E.J. Prebys, M. S. Dixit, Frans Meijers, J. P. Martin, S. De Jong, N. C. Wood, P. Debu, J. G. Layter, and S. Sanghera
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Dipole, Neutral current, Electron–positron annihilation, High Energy Physics::Phenomenology, Moment (physics), High Energy Physics::Experiment, Observable, Expectation value, Signature (topology), Lepton
Abstract: Using a sample of 5558 Z 0 → τ + τ − decays produced at LEP a direct test of CP -invariance in the neutral current reaction e + e − → τ + τ − is performed. Samples of events where eachy τ decays into a single particle have been isolated for the construction of CP -odd observables. Three different event classes are considered: lepton-lepton, lepton-hadron, and hadron-hadron. No evidence for a non-zero expectation value of the considered CP -observables and hence for CP -violation is observed. Quantitatively, we deduce from this null result an estimate on the weak dipole moment d τ (m 2 Z = (−4.5 ± 5.3 ± 1.4) × 10 −17 e cm for the lepton-lepton signature and d τ (m 2 Z = (1.4 ± 3.7 ± 1.3) × 10 −17 e cm for the hadron-hadron signature. Combining these results we place a limit with 95% confidence of | d τ |⩽7.0 × 10 −17 e cm.
Published: 1992
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39. 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
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40. 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
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41. 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
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42. Measurement of three-jet distributions sensitive to the gluon spin ine + e − annihilations at $$\sqrt s = 91$$ GeV

Author: Phillip Allport, P. W. Jeffreys, A. M. Lee, B. C. Shen, J. D. Hobbs, H. E. Stier, D. A. Hinshaw, G. G. Hanson, P. Tarras, H. Mes, P. G. Estabrooks, R. K. Keeler, A. Simon, J. D. Gillies, I. P. Duerdoth, G. Giacomelli, Gideon Alexander, H. Przysiezniak, C. Y. Chang, N. C. Wood, E.J. Prebys, Otmar Biebel, D. G. Charlton, W. G. Scott, Paolo Capiluppi, P. Schenk, R. J. Barlow, O. Runolfsson, T. Mouthuy, L. Lessard, F. S. Merritt, Mitsuaki Nozaki, P. M. Watkins, M. Couch, D. J. Miller, Claudio Grandi, R. Humbert, M. S. Dixit, Frans Meijers, R. Kowalewski, Margret Fincke-Keeler, M. Jimack, John Allison, N. Wermes, M. A. Whalley, G. A. Snow, C. P. Ward, J. T.M. Chrin, L. Janissen, C. Milstene, Ehud Duchovni, R. Shypit, M. J. Losty, P. Singh, S. Schreiber, B. B. Brabson, J. G. Layter, A. M. Rossi, D. G. Fong, T. Kawamoto, J. Gascon, Kiyotomo Kawagoe, I. Wingerter, B. P. O'Neill, F. Lamarche, G. Beaudoin, A. Buijs, A. P. Wagner, T. J. McMahon, R. G. Kellogg, P. Pfister, T. Tsukamoto, J. Hagemann, H. Ihssen, S. W. Gensler, R. W. L. Jones, S. Levegrün, H. M. Fischer, S. Orito, John H. Schwarz, H. von der Schmitt, W. R. Gibson, G. Duckeck, R. Mir, R. J. Hemingway, Silvia Arcelli, A. Michelini, J. M. Roney, D. Hochman, N. J. Thackray, T. J. Smith, C. Ho, D. Strom, G. T. Zorn, Stefano Marcellini, R. F. McGowan, T. Kobayashi, H. Oh, Shlomo Dado, S. Sanghera, R. K. Carnegie, K. Stephens, C. Fukunaga, P. Jovanovic, J. Goldberg, J. C. Armitage, P. Mättig, H. O. Ogren, J. A. Wilson, Christoph Geich-Gimbel, P. Igo-Kemenes, G. Maringer, F. Odorici, S. A. Robins, J. R. McNutt, Austin Ball, D. Menszner, Alessandro Montanari, H. M. Bosch, D. C. Imrie, Tohru Takeshita, M. M. Deninno, M. J. Oreglia, W. Schappert, H. Jeremie, P. Le Du, H. Kreutzmann, A. Beck, J. Mildenberger, Harold Nguyen, Marcello Mannelli, M. Jobes, U. Binder, E. Heflin, R. M. Brown, Wolfram Dietrich Zeuner, E. K. U. Gross, A. Gaidot, M. Kuwano, P. Scharff-Hansen, Lorne Levinson, C. M. Hawkes, M. Cooper, Daniel Lellouch, G. P. Siroli, B. Nellen, P. Leblanc, M. J. Goodrick, M. Sproston, B. Panzer-Steindel, R. E. Hughes-Jones, U. Maur, I. Cohen, J. Hart, V. Gibson, Y. Yang, P. F. Harrison, J. L. Pinfold, G. Eckerlin, Michael Dittmar, W. J. Larson, D. Axen, A. Jawahery, John Baines, B. W. Kennedy, Georges Azuelos, G. Tysarczyk-Niemeyer, J. Kroll, O. Schaile, F. X. Gentit, J. E. Conboy, S. W. O'Neale, Peter R Hobson, M. Ogg, M. Hansroul, J. R. Carter, K. W. Bell, G. N. Patrick, G. Yekutieli, Gideon Bella, Stephen Lloyd, J. W. Gary, Takehiko Mori, A. D. Schaile, Peter Sherwood, S. Wotton, H. Takeda, Max Weber, K. J. Anderson, J. C. Hill, R. W. Springer, M. Weymann, A. Pouladdej, H. J. Burckhart, D. E. Klem, A. A. Carter, Misao Sasaki, A. M. Smith, Jacqueline Batley, N. I. Geddes, J. Ludwig, K. Runge, G. Vasseur, P. Routenburg, D. R. Ward, F. G. Oakham, P. Bock, Erez Etzion, M. W. Moss, Paul Kyberd, F. K. Loebinger, B. Lorazo, V. H. Winterer, A. Dieckmann, P. M. Hattersley, S. Bougerolle, Andris Skuja, B. Poli, J. Banks, M. W. Redmond, S. R. Hou, Claude Leroy, Gareth J. Barker, Tetsuro Mashimo, J. P. Martin, R. J. Homer, A. Rollnik, S. De Jong, M. F. Turner, P. Poffenberger, J. P. Pansart, N. K. Watson, J. von Krogh, I. J. Bloodworth, P. A. Elcombe, Shlomit Tarem, C. Wahl, W. J. Collins, Sachio Komamiya, A. T. Watson, S. Weisz, P. Ashton, Dave Robinson, Randall Sobie, G. D. Lafferty, C. P. Howarth, W. Gorn, D. E. Plane, T. P. Kokott, Rene Brun, J. E. Pilcher, M. Settles, G. A. Bahan, Stephen Hillier, R. D. Heuer, C. Moisan, J. P. Walker, C. K. Hargrove, T. W. Pritchard, Fabrizio Fabbri, G. M. Dallavalle, P. Teixeira-Dias, S. Rossberg, P. S. Wells, M. Hauschild, C. J. Oram, D. J.P. Dumas, C. J. Virtue, P. Paschievici, Terry Richard Wyatt, D. Van den plas, G. W. Wilson, D. Karlen, M. Coupland, D. L. Rees, P. Debu, J. Becker, D. R. Rust, R. P. Middleton, G. J. VanDalen, P. Lennert, M. H. Letho, R. Van Kooten, J. M. Lorah, W. Mohr, S. J. Pawley, Claus Kleinwort, L. Köpke, X. C. Lou, P. G. Murphy, Giora Mikenberg, P. E.L. Clarke, T. Behnke, B. Holl, I. Zacharov, Horst Breuker, R. Yaari, S. Bethke, Marco Cuffiani, Gunter Quast, A. Astbury, O. Ganel, A. J. Martin, and K. Riles
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Scalar (mathematics), Elementary particle, Jet (particle physics), Gluon, Nuclear physics, High Energy Physics::Experiment, Field theory (psychology), Quantum field theory, Engineering (miscellaneous), Spin-½
Abstract: Three-jet variables constructed from multi-hadronic events produced byZ0 decays are compared to theoretical calculations assuming a vector gluon or a hypothetical scalar gluon. The data yield conclusive direct evidence for the former case. The distributions of the reduced energy of the second-most energetic jet and of the cosine of the Ellis-Karliner angle are chosen to demonstrate this effect.
Published: 1991
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43. A search for scalar leptoquarks in Z0 decays

Author: H. E. Stier, P. G. Estabrooks, Erez Etzion, Gareth J. Barker, N. I. Geddes, P. Schenk, A. D. Schaile, Shlomit Tarem, P. M. Watkins, H. Mes, Kiyotomo Kawagoe, S. Rossberg, I. P. Duerdoth, V. H. Winterer, Tohru Takeshita, I. Wingerter, O. Schaile, A. P. Wagner, R. P. Middleton, B. Poli, S. R. Hou, J. M. Roney, Georges Azuelos, G. Beaudoin, L. Janissen, D. J. Miller, K. W. Bell, Max Weber, Misao Sasaki, H. O. Ogren, J. Goldberg, B. C. Shen, Shlomo Dado, H. Takeda, M. Hansroul, Christoph Geich-Gimbel, B. Nellen, N. Wermes, C. Milstene, P. Leblanc, F. Odorici, W. G. Scott, P. S. Wells, F. G. Oakham, C. J. Virtue, O. Runolfsson, X. C. Lou, P. G. Murphy, M. M. Deninno, Terry Richard Wyatt, B. Holl, J. Kroll, R. J. Homer, R. Kowalewski, L. Lessard, Andris Skuja, S. W. O'Neale, Ehud Duchovni, M. Coupland, T. J. Smith, F. X. Gentit, J. E. Conboy, J. D. Gillies, M. Ogg, M. J. Losty, Peter R Hobson, Giora Mikenberg, Silvia Arcelli, Claudio Grandi, P. Igo-Kemenes, D. C. Imrie, Richard Keeler, P. Mättig, I. Zacharov, C. Y. Chang, M. J. Goodrick, A. Pouladdej, I. Cohen, Tetsuro Mashimo, P. Singh, T. Mouthuy, C. Moisan, J. P. Walker, Horst Breuker, R. J. Barlow, G. Maringer, H. Ihssen, H. Jeremie, K. Stephens, C. Fukunaga, C. M. Hawkes, M. Cooper, Daniel Lellouch, R. Shypit, Takehiko Mori, G. K. VanDalen, P. W. Jeffreys, R. Van Kooten, F. S. Merritt, J. R. McNutt, G. P. Siroli, J. D. Hobbs, Claude Leroy, C. Wahl, P. Taras, S. W. Gensler, J. P. Pansart, R. W. L. Jones, N. C. Wood, W. Gorn, R. E. Hughes-Jones, U. Maur, Mitsuaki Nozaki, A. M. Lee, G. G. Hanson, F. Lamarche, D. E. Plane, R. J. Hemingway, Stephen Hillier, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, V. Gibson, M. H. Lehto, M. A. Whalley, G. A. Bahan, J. Mildenberger, Harold Nguyen, Gunter Quast, S. Wotton, T. Kobayashi, G. M. Dallavalle, John Baines, Margret Fincke-Keeler, I. J. Bloodworth, C. P. Howarth, P. Jovanovic, E. K. U. Gross, A. Gaidot, M. Kuwano, Gideon Bella, H. J. Burckhart, N. K. Watson, M. Sproston, G. A. Snow, C. P. Ward, B. B. Brabson, M. Weymann, A. Buijs, J. E. Pilcher, Austin Ball, G. Giacomelli, J. Hart, E.J. Prebys, A. M. Rossi, D. E. Klem, D. R. Ward, M. Settles, D. Menszner, R. F. McGowan, D. G. Fong, Sachio Komamiya, Jacqueline Batley, B. P. O'Neill, Alan Watson, D. J.P. Dumas, P. Pfister, J. L. Pinfold, A. Astbury, J. Gascon, T. Tsukamoto, H. von der Schmitt, Alessandro Montanari, M. W. Moss, O. Ganel, S. Levegrün, H. M. Fischer, A. J. Martin, M. F. Turner, Y. Yang, P. Routenburg, P. M. Hattersley, T. P. Kokott, Rene Brun, J. Hagemann, J. C. Armitage, G. W. Wilson, D. Karlen, K. Riles, G. Eckerlin, M. S. Dixit, Frans Meijers, C. J. Oram, W. R. Gibson, P. F. Harrison, S. Bougerolle, W. J. Collins, S. J. Pawley, C. Ho, Marcello Mannelli, A. Michelini, Paul Kyberd, F. K. Loebinger, C. K. Hargrove, Stephen Lloyd, M. Jobes, U. Binder, D. Hochman, N. J. Thackray, P. Scharff-Hansen, G. D. Lafferty, A. Dieckmann, Claus Kleinwort, P. A. Elcombe, L. Köpke, W. J. Larson, P. Teixeira-Diaz, H. Przysiezniak, D. R. Rust, M. W. Redmond, J. W. Gary, T. W. Pritchard, J. G. Layter, A. Beck, A. Rollnik, A. M. Smith, P. E.L. Clarke, T. Behnke, E. Heflin, G. Vasseur, B. Lorazo, P. Lennert, Phillip Allport, R. M. Brown, S. Sanghera, M. Hauschild, S. A. Robins, R. Sobie, M. Jimack, John Allison, J. P. Martin, Gideon Alexander, Lorne Levinson, Paolo Capiluppi, K. J. Anderson, John Hill, P. Paschievici, B. W. Kennedy, S. De Jong, R. G. Kellogg, J. Banks, D. L. Rees, J. Becker, R. Yaari, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, S. Bethke, Marco Cuffiani, Stefano Marcellini, P. Debu, P R Poffenberger, J. M. Lorah, W. Mohr, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, Michael Dittmar, G. Yekutieli, J. Ludwig, K. Runge, P. Bock, A. Simon, Otmar Biebel, D. G. Charlton, M. Couch, R. Humbert, G. Duckeck, A. A. Carter, J. T.M. Chrin, D. Strom, G. T. Zorn, H. M. Bosch, T. Kawamoto, Wolfram Dietrich Zeuner, S. Orito, John H. Schwarz, D. A. Hinshaw, R. Mir, H. Oh, M. J. Oreglia, J. R. Carter, G. N. Patrick, J. von Krogh, P. Ashton, Dave Robinson, S. Schreiber, T. J. McMahon, R. K. Carnegie, J. A. Wilson, and W. Schappert
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Branching fraction, Electron–positron annihilation, High Energy Physics::Phenomenology, Scalar (physics), Nuclear physics, High Energy Physics::Experiment, Leptoquark, Neutrino, Particle Physics - Experiment, Storage ring, Lepton
Abstract: A search for scalar leptoquarks has been performed with data from the OPAL detector at the e+e− storage ring LEP. In a data sample corresponding to an integrated luminosity of 6.3 pb−1 no evidence for leptoquark production was observed where the leptoquark decays into a quark and either a charged lepton (e, μ, τ) or a neutrino. An upper limit of 1.7 pb on the production cross section for leptoquarks is obtainedassuming a branching ratio of 50% for the decay of the leptoquark into the channels with a charged lepton. Lower limits on the leptoquark mass between 41.4 and 46.4 GeV/c2 at 95% CL are obtained, depending on the effecte SU(2) × U(1) invariant couplings assigned to the leptoquark.
Published: 1991
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44. Measurement of theZ 0 line shape parameters and the electroweak couplings of charged leptons

Author: M. Jimack, John Allison, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, B. Holl, N. C. Wood, C. M. Hawkes, M. Cooper, Daniel Lellouch, J. Ludwig, G. J. Van Dalen, K. Runge, P. Bock, A. Simon, Otmar Biebel, D. G. Charlton, Takehiko Mori, I. Zacharov, Horst Breuker, G. A. Snow, C. P. Ward, M. Couch, A. D. Schaile, R. G. Kellogg, C. Y. Chang, P. Taras, Mitsuaki Nozaki, D. A. Hinshaw, R. Humbert, J. T.M. Chrin, Stefano Marcellini, V. H. Winterer, O. Runolfsson, T. Kawamoto, T. J. Smith, S. Orito, S. Bougerolle, P. Mättig, L. Lessard, John H. Schwarz, T. R. Wyatt, Claudio Grandi, S. R. Hou, Gunter Quast, P. Singh, T. Mouthuy, J. M. Lorah, W. Mohr, R. Mir, H. Oh, I. J. Bloodworth, J. G. Layter, S. Sanghera, F. S. Merritt, M. Settles, R. W. L. Jones, G. Beaudoin, M. J. Oreglia, W. J. Collins, G. D. Lafferty, P. Le Du, J. Hart, Y. Yangh, H. Kreutzmann, B. Panzer-Steindel, H. Przysiezniak, A. M. Rossi, K. J. Anderson, A. Astbury, G. Duckeck, D. Karlen, W. R. Gibson, Tohru Takeshita, D. Strom, P. E.L. Clarke, T. Behnke, Paul Kyberd, F. K. Loebinger, G. Giacomelli, T. Tsukamoto, Shlomo Dado, S. Levegrün, G. T. Zorn, T. W. Pritchard, Georges Azuelos, H. M. Bosch, Wolfram Dietrich Zeuner, C. Moisan, J. R. Carter, O. Ganel, P. W. Jeffreys, P. Igo-Kemenes, G. Maringer, G. N. Patrick, K. W. Bell, J. P. Walker, C. Ho, X. C. Lou, Gideon Bella, D. Hochman, N. J. Thackray, H. J. Burckhart, Jacqueline Batley, M. W. Redmond, A. M. Lee, P. G. Murphy, A. J. Martin, Max Weber, H. Jeremie, K. Stephens, A. Rollnik, D. E. Klem, Kiyotomo Kawagoe, R. F. McGowan, J. C. Hill, Giora Mikenberg, J. R. McNutt, B. C. Shen, C. Fukunaga, A. Beck, M. A. Whalley, K. Riles, R. E. Hughes-Jones, U. Maur, R. Van Kooten, E. K. U. Gross, P. Teixeira-Dias, E. Heflin, A. Gaidot, Erez Etzion, M. Kuwano, W. G. Scott, M. Sproston, G. Eckerlin, Gareth J. Barker, R. M. Brown, Lorne Levinson, A. P. Wagner, P. Routenburg, A. Dieckmann, V. Gibson, John Baines, R. Kowalewski, M. J. Losty, M. F. Turner, P. Poffenberger, N. I. Geddes, Shlomit Tarem, P. A. Elcombe, Silvia Arcelli, J. L. Pinfold, A. Buijs, M. H. Lehto, H. O. Ogren, Christoph Geich-Gimbel, J. P. Martin, M. Sasaki, S. De Jong, B. W. Kennedy, D. L. Rees, J. Becker, B. Poli, S. Rossberg, C. J. Oram, D. R. Ward, P. F. Harrison, Stephen Lloyd, J. M. Roney, R. Yaari, S. Bethke, C. K. Hargrove, M. M. Deninno, H. M. Fischer, P. Debu, J. Mildenberger, Harold Nguyen, R. P. Middleton, Marco Cuffiani, J. Kroll, A. Michelini, J. D. Hobbs, F. X. Gentit, N. Wermes, G. G. Hanson, J. E. Conboy, M. Ogg, Ehud Duchovni, R. Shypit, S. A. Robins, D. E. Plane, Stephen Hillier, Michael Dittmar, E.J. Prebys, G. M. Dallavalle, A. Pouladdej, H. Ihssen, B. P. O'Neill, G. Yekutieli, M. S. Dixit, Frans Meijers, Alan Watson, D. J.P. Dumas, J. Hagemann, S. W. Gensler, J. Goldberg, B. Nellen, P. Leblanc, O. Schaile, D. C. Imrie, A. A. Carter, M. J. Goodrick, T. Kobayashi, M. Hansroul, S. W. O'Neale, Peter R Hobson, I. Cohen, S. J. Pawley, Phillip Allport, Claus Kleinwort, L. Köpke, R. J. Homer, S. Wotton, Margret Fincke-Keeler, G. P. Siroli, G. W. Wilson, M. Hauschild, P. S. Wells, D. R. Rust, P. Paschievici, C. J. Virtue, P. Pfister, Gideon Alexander, J. C. Armitage, M. Coupland, Paolo Capiluppi, P. Schenk, P. Lennert, S. Schreiber, M. Weymann, T. J. McMahon, Richard Keeler, C. Wahl, C. P. Howarth, J. E. Pilcher, R. K. Carnegie, H. E. Stier, R. Sobie, N. K. Watson, Claude Leroy, M. W. Moss, J. A. Wilson, J. P. Pansart, P. M. Hattersley, Sachio Komamiya, P. G. Estabrooks, W. Schappert, T. P. Kokott, Rene Brun, J. Banks, P. M. Watkins, S. Weisz, R. D. Heuer, Fabrizio Fabbri, D. Van den plas, I. Wingerter, J. von Krogh, P. Ashton, Dave Robinson, H. Mes, I. P. Duerdoth, L. Janissen, C. Milstene, F. Odorici, Andris Skuja, Tetsuro Mashimo, W. Gorn, G. A. Bahan, M. Jobes, U. Binder, P. Scharff-Hansen, W. J. Larson, J. W. Gary, A. M. Smith, G. Vasseur, B. Lorazo, B. B. Brabson, D. G. Fong, J. Gascon, H. von der Schmitt, Marcello Mannelli, H. Takeda, F. G. Oakham, J. D. Gillies, R. J. Barlow, D. J. Miller, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, and Alessandro Montanari
Subjects: Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Electroweak interaction, Weinberg angle, Standard Model, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous), Pseudovector, Boson, Lepton
Abstract: We report on an improved measurement of the mass of theZ0 boson, its total width and its partial decay widths into hadrons and leptons, as well as the effective axial vector and vector couplings to charged leptons. These measurements are based on a data set of approximately 160 000 hadronicZ0 decays and 18 000 decays into electrons, muons and taus, recorded by the OPAL experiment at centre of mass energies near the mass of theZ0. The total width and the partial widths to visible final states, derived from the measured cross sections, are used to extract the invisible width. The effective couplings of theZ0 to charged leptons are studied using measurements of the lepton pair cross sections and forward-backward asymmetries at the different centre of mass energy points of theZ0 scan. The implications of our results in the context of the Standard Model are discussed.
Published: 1991
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45. 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
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46. A comparison of measured jet cross sections with QCD calculations fore + e − annihilation

Author: J. Spitzer, R. Ramcke, R. Marshall, I. W. Walker, P. G. Murphy, P. Hill, K. H. Hellenbrand, J. A.J. Skard, M. Zimmer, F. K. Loebinger, S. Komamiya, G. Weber, G. Heinzelmann, G. Hughes, N. Magnussen, K. Stephens, H. von der Schmitt, R. Meinke, F. Foster, D. Haidt, T. Greenshaw, J. T.M. Chrin, B. Naroska, S. L. Cartwright, I. P. Duerdoth, John Allison, Claus Kleinwort, Tetsuro Mashimo, S. Bethke, A. A. Macbeth, J. E. Olsson, J. M. Nye, L. Smolik, C. K. Bowdery, P. Steffen, R. P. Middleton, H. Krehbiel, J. Hagemann, M. Kuhlen, G. Eckerlin, K. Ambrus, Joachim Heintze, H. Rieseberg, F. Ould-Saada, A. Dieckmann, Daniel Pitzl, H. Kado, H. Meyer, U. Schneekloth, R. J. Barlow, D. Schmidt, G. T. Zorn, T. Kobayashi, W. Bartel, Mitsuaki Nozaki, J. v. Krogh, G. Knies, E. Elsen, D. Clarke, R. Felst, Kiyotomo Kawagoe, A. P. Wagner, and Alexander Finch
Subjects: Physics, Coupling constant, Quantum chromodynamics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Scale (ratio), Electron–positron annihilation, Monte Carlo method, Jet (particle physics), Renormalization, Nuclear physics, High Energy Physics::Experiment, Engineering (miscellaneous)
Abstract: The cross sections for 2-, 3- and 4-jet production have been determined with the JADE detector, sited on thee+e−-storage ring PETRA. Data at$\sqrt s = 14$, 22, 35 and 44 GeV were compared to twoO(α s 2 ) QCD calculations. A first analysis was performed with uncorrected data using theO(α s 2 ) 3-jet matrix element calculation of Ellis, Ross and Terrano and the Lund String Monte Carlo program. In a second analysis the calculation of Kramer and Lampe was compared to corrected data. Both approaches gave a poor description of the data when the square of the momentum transferQ2=s was used as the scale of the running coupling constant. The description improved when the renormalization scale was adjusted to the process studied. The data ware used to fix the best renormalization scale.
Published: 1991
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47. Final results on muon and tau pair production by the JADE Collaboration at PETRA

Author: H. von der Schmitt, I. P. Duerdoth, F. Foster, S. Komamiya, J. A.J. Skard, Daniel Pitzl, J. Hagemann, W. Bartel, E. Elsen, R. Felst, L. Smolik, G. Heinzelmann, P. Hill, G. Eckerlin, G. T. Zorn, U. Schneekloth, F. Schroth, R. J. Barlow, I. W. Walker, P. G. Murphy, T. Greenshaw, J. T.M. Chrin, H. Kado, Alexander Finch, M. Zimmer, J. Spitzer, H. Rieseberg, F. Ould-Saada, D. Schmidt, D. Haidt, B. Naroska, S. L. Cartwright, Kiyotomo Kawagoe, S. Bethke, M. Kuhlen, A. P. Wagner, D. Clarke, Mitsuaki Nozaki, A. A. Macbeth, R. Meinke, A. Dieckmann, John Allison, N. Magnussen, J. v. Krogh, K. Stephens, J. M. Nye, G. Hughes, G. Knies, H. Takeda, P. Steffen, R. P. Middleton, K. Ambrus, J. E. Olsson, J. Heintze, F. K. Loebinger, S. Hegner, K. H. Hellenbrand, R. Ramcke, R. Marshall, H. Krehbiel, Claus Kleinwort, G. Weber, and C. K. Bowdery
Subjects: Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Electroweak interaction, Sigma, Charge (physics), JADE (particle detector), Standard Model, Nuclear physics, Pair production, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous)
Abstract: The cross-sections and the forward-backward charge asymmetries of muon and tau pairs produced ine + e − collisions at $$\sqrt s = 35 GeV$$ have been measured by the JADE Collaboration. The cross-sections, $$\sigma _\mu (\sqrt s = GeV) = 69.79 \pm 1.35 \pm 1.40 pb$$ and $$\sigma _\mu (\sqrt s = GeV) = 71.72 \pm 1.48 \pm 1.61 pb$$ , are in agreement with the QED α3 prediction. The charge asymmetries areA μ=−(9.9±1.5±0.5)% andA τ=−(8.1±2.0±0.6)% in agreement with the value −9.2% predicted by the standard model, usingM Z=91.0 GeV and sin2θ W =0.230.
Published: 1990
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48. 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
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49. Measurement of two photon production of ρ0ω

Author: S. Komamiya, J. E. Olsson, J. Heintze, John Allison, H. Krehbiel, M. Zimmer, J. M. Nye, J. A.J. Skard, G. Weber, P. Hill, G. Hughes, P. Steffen, L. Smolik, G. Heinzelmann, G. Eckerlin, J. v. Krogh, R. Ramcke, R. Marshall, R. Meinke, H. Rieseberg, F. Ould-Saada, R. P. Middleton, Alexander Finch, Claus Kleinwort, G. Knies, R. Felst, K. H. Hellenbrand, Tohru Takeshita, J. Spitzer, F. K. Loebinger, N. Magnussen, Kiyotomo Kawagoe, I. W. Walker, P. G. Murphy, A. Wegner, I. P. Duerdoth, T. Greenshaw, A. P. Wagner, E. Elsen, J. T.M. Chrin, K. Ambrus, J. Hagemann, S. Bethke, T. Kawamoto, D. Clarke, A. A. Macbeth, G. T. Zorn, C. K. Bowdery, F. Foster, Daniel Pitzl, U. Schneekloth, A. Dieckmann, R. J. Barlow, D. Haidt, B. Naroska, S. L. Cartwright, D. Schmidt, K. Stephens, H. Kado, M. Kuhlen, and W. Bartel
Subjects: Physics, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), Two-photon excitation microscopy, Detector, Engineering (miscellaneous), JADE (particle detector)
Abstract: The reaction γγ→π+π-π+π-π0 has been studied using the JADE detector at PETRA. The cross sections for γγ→ωπ+- and for γγ→ωρ0- are given. We observe no peak in these cross sections in the regionWγγ=1.9–2.0 GeV.
Published: 1990
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50. Measurement of resonance production in the reactionsγγ →π 0 π 0 andγγ →π 0 η

Author: M. Zimmer, Kiyotomo Kawagoe, J. Spitzer, A. P. Wagner, E. Elsen, G. Weber, P. Hill, R. Meinke, A. A. Macbeth, A. Sato, H. Kado, Claus Kleinwort, T. Greenshaw, J. T.M. Chrin, Joachim Heintze, K. Ambrus, W. Bartel, K. Stephens, D. Schmidt, D. Haidt, B. Naroska, S. L. Cartwright, J. Hagemann, R. Felst, C. K. Bowdery, I. W. Walker, P. G. Murphy, Tohru Takeshita, L. Smolik, F. Foster, G. Heinzelmann, J. v. Krogh, G. T. Zorn, M. Kuhlen, G. Eckerlin, D. Clarke, G. Knies, T. Oest, A. J. Finch, H. Krehbiel, J. M. Nye, F. K. Loebinger, H. Rieseberg, F. Ould-Saada, P. Steffen, G. Hughes, S. Bethke, R. P. Middleton, N. Magnussen, John Allison, I. P. Duerdoth, J. A.J. Skard, S. Komamiya, R. J. Barlow, J. E. Olsson, K. H. Hellenbrand, R. Ramcke, R. Marshall, A. Dieckmann, Daniel Pitzl, and U. Schneekloth
Subjects: Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Isospin, Resonance, Production (computer science), Spin (physics), Engineering (miscellaneous), Helicity
Abstract: Resonance production in the γγ reactionse+e−→e+e+e−π0π0 ande+e−π0η has been studied with the JADE detector at PETRA. The decay widths into γγ of thef2(1270),a0(980) anda2(1320) were measured to be$\Gamma _{\gamma \gamma } (f_2 (1270)) = 3.19 \pm 0.09_{ - 0.38}^{ + 0.22} $ Kev,Γλλ(a0(980))=0.28±0.04±0.10 KeV/BR(a0(980)→π0η) andΓλλ(a2(1320))=1.01±0.14±0.22KeV. For thef0(975) andf4(2050) upper limits of the widths were obtained,Γλλ(f0(975))
Published: 1990
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