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1. 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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2. 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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3. Measurement of the B0 and B+ lifetimes

Author: W. R. Gibson, A. Beck, E. Heflin, R. M. Brown, G. Transtromer, B. W. Kennedy, E. Torrente-Lujan, M. Fincke-Keeler, D. E. Plane, P. Bentkowski, Alan Watson, D. J.P. Dumas, Silvia Arcelli, Tara Shears, P. Igo-Kemenes, G. Maringer, R. Sobie, H. Jeremie, R. E. Hughes-Jones, U. Maur, P. Bright-Thomas, Horst Breuker, H. M. Fischer, E. do Couto e Silva, J. Pinfold, C. Burgard, F. C. Grant, P. E.L. Clarke, M. A. Whalley, A. Michelini, A. C. Janissen, O. Ganel, G. A. Snow, C. P. Ward, R. Yaari, H. O. Ogren, Christoph Geich-Gimbel, A. Simon, D. L. Rees, A. Buijs, M. Jobes, Otmar Biebel, G. E. Richards, U. Binder, D. G. Charlton, D. L. Wagner, P. G. Estabrooks, N. Paz-Jaoshvili, P. Scharff-Hansen, J. Kroll, G. Yekutieli, F. X. Gentit, H. Deng, R. Humbert, J. E. Conboy, P. M. Watkins, G. Beaudoin, D. R. Rust, A. Pouladdej, Paul Kyberd, F. K. Loebinger, B. C. Shen, C. Schwick, A. M. Smith, F. S. Merritt, J. Steuerer, D. Strom, G. Vasseur, B. Lorazo, Kiyotomo Kawagoe, A. Astbury, M. W. Redmond, W. G. Scott, Richard Keeler, Norbert Wermes, T. Kawamoto, G. M. Dallavale, N. I. Geddes, A. J. Martin, J. A. McKenna, Shlomo Dado, A. Rollnik, R. Giacomelli, F. G. Oakham, D. Hochman, C. Y. Chang, M. F. Turner, M. Morii, S. Bethke, P. Taras, Peter R Hobson, R. Kowalewski, B. Boden, Marco Cuffiani, Mitsuaki Nozaki, R. F. McGowan, Claude Leroy, D. G. Fong, J. P. Pansart, B. Poli, J. Gascon, J. Hart, S. Orito, P. Weber, S. Tarem, T. Behnke, Sachio Komamiya, E. Ros, X. C. Lou, H. von der Schmitt, M. J. Losty, M. Jimack, H. Ihssen, John Allison, G. Quast, C. K. Hargrove, S. L. Chu, J. R. McNutt, J. D. Gillies, Gideon Bella, P. Pfister, R. Mir, S. W. Gensler, T. P. Kokott, Carla Sbarra, T. Hilse, J. Banks, J. W. Gary, H. J. Burckhart, Jacqueline Batley, T. Mouthuy, S. J. Hillier, P. Paschievici, T. Kobayashi, C. J. Virtue, N. J. Tresilian, P. S. Wells, Terry Richard Wyatt, Marcello Mannelli, J. E. Duboscq, R. D. Heuer, R. G. Kellogg, J. von Krogh, O. Runolfsson, Andris Skuja, Fabrizio Fabbri, M. Coupland, R. J. Barlow, D. Van den plas, G. T. Zorn, O. Schaile, S. Barnett, D. J. Miller, D. S. Koetke, A. D. Schaile, John Hobbs, Tetsuro Mashimo, Dave Robinson, Stefano Marcellini, T. Wlodek, Tohru Takeshita, M. H. Lehto, L. A. del Pozo, James Letts, N. J. Thackray, V. H. Winterer, A. M. Rossi, T. Tsukamoto, S. Levegrün, K. Stephens, Michael Dittmar, F. Lamarche, Claudio Grandi, Georges Azuelos, P. F. Harrison, W. Gorn, M. J. Oreglia, A. Yeaman, J. Mildenberger, Harold Nguyen, R. J. Hemingway, M. A. Thomson, J. F. Kral, K. W. Bell, G. A. Bahan, D. Pitman, A. A. Carter, P. Singh, N. K. Watson, Stephen Lloyd, P. M. Hattersley, Max Weber, M. Tecchio, C. Moisan, J. P. Walker, R. Van Kooten, V. Gibson, P. Berlich, P. Jovanovic, A. Gaidot, M. Sproston, L. Köpke, W. J. Collins, M. Hauschild, J. C. Hill, Misao Sasaki, G. A. Beck, J. R. Carter, Austin Ball, R. W. L. Jones, G. N. Patrick, John Baines, G. D. Lafferty, P. Poffenberger, R. Lahmann, D. Menszner, P. Teixeira-Dias, Phillip Allport, S. W. O'Neale, B. Panzer-Steindel, S. Schreiber, P. Routenburg, C. Markus, C. J. Oram, N. Tesch, A. Dieckmann, Alessandro Montanari, T. W. Pritchard, T. J. McMahon, K. J. Anderson, G. P. Siroli, J. Schwiening, D. R. Ward, J. P. Martin, R. K. Carnegie, P. A. Elcombe, J. Hagemann, D. C. Imrie, H. Przysiezniak, B. Schmitt, J. C. Clayton, J. A. Wilson, S. De Jong, M. Fierro, M. Yurko, M. Rosvick, J. Becker, W. Schappert, A. Wagner, P. W. Jeffreys, A. M. Lee, C. Wahl, G. J. VanDalen, L. Levinson, R. Shypit, M. Hansroul, C. Jui, J. E. Pilcher, D. Lellouch, C. H. Shepherd-Themistocleous, R. J. Homer, J. M. Lorah, W. Mohr, Gideon Alexander, Paolo Capiluppi, D. A. Hinshaw, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, G. Duckeck, R. Ströhmer, F. Odorici, H. M. Bosch, Wolfram Dietrich Zeuner, G. Mikenberg, H. Mes, I. P. Duerdoth, M. Kwano, J. M. Roney, I. J. Bloodworth, M. Settles, M. Foucher, G. W. Wilson, D. Karlen, A. K. Honma, T. J. Smith, P. Mättig, C. M. Hawkes, M. Cooper, Takehiko Mori, P. D. Acton, E. Duchovni, Erez Etzion, Stefan Kluth, S. Rossberg, J. G. Layter, R. P. Middleton, S. Wotton, G. G. Hanson, J. Goldberg, B. Nellen, P. Leblanc, G. Giacomelli, H. G. Evans, M. J. Goodrick, I. Cohen, P. Schenk, M. S. Dixit, and Frans Meijers
Subjects: Nuclear physics, Physics, Hadronic decay, Nuclear and High Energy Physics, Meson, Silicon, chemistry, Electron–positron annihilation, Hadron, chemistry.chemical_element, Particle Physics - Experiment
Abstract: From a data sample of approximately 240 000 hadronic Z 0 decays recorded during 1991 a sample of about 130 semileptonic B hadron decays containing a D 0 , D + or D ∗+ has been isolated. Using silicon microvertex detector information the decay vertices in these events have been reconstructed. The average B hadron lifetime of the mix of B hadrons in this event sample is measured to be 1.51 −0.14 +0.16 ±0.11 ps. From the distribution of decay times in the different samples the lifetimes of the B 0 and B + mesons are determined to be 1.51 −0.23−0.14 +0.24+0.12 ps and 1.51 −0.28−0.14 +0.30+0.12 ps, respectively. The measured ratio of the B + to B 0 lifetimes of 1.00 −0.25 +0.33 ±0.08 supports expectations that the lifetimes are similar.
Published: 1993
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4. 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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5. 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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6. 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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7. 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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8. 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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9. 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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10. 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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11. 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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12. 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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13. 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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14. 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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15. 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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16. 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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17. 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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18. 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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19. 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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20. Measurement of branching ratios and τ polarization from τ→eνν−,τ→μνν−,andτ→π(K)ν decays at LEP

Author: Gideon Bella, H. J. Burckhart, Jacqueline Batley, H. M. Fischer, A. Michelini, H. E. Stier, P. E.L. Clarke, J. Hart, Sachio Komamiya, P. G. Estabrooks, T. Behnke, Robin Middleton, C. Milstene, Erez Etzion, B. B. Brabson, S. A. Robins, Y. Yang, D. G. Fong, Andris Skuja, P. Schenk, A. D. Schaile, Tetsuro Mashimo, J. Gascon, W. Gorn, H. von der Schmitt, G. A. Bahan, T. P. Kokott, Rene Brun, Richard Keeler, Marcello Mannelli, Gareth J. Barker, M. Jobes, U. Binder, Shlomit Tarem, P. Scharff-Hansen, W. J. Larson, J. W. Gary, T. Kobayashi, F. Odorici, A. M. Smith, H. Takeda, G. N. Patrick, G. Vasseur, P. F. Harrison, J. R. Carter, B. Lorazo, P. M. Watkins, F. G. Oakham, M. F. Turner, A. M. Lee, J. D. Hobbs, Robert M Brown, F. L. Fabbri, S. Rossberg, K. Stephens, G. G. Hanson, Kiyotomo Kawagoe, N. C. Wood, R. Yaari, Paul Kyberd, S. Bethke, F. K. Loebinger, P. Singh, J. R. McNutt, Claude Leroy, J. P. Pansart, A. P. Wagner, N. Wermes, P. Igo-Kemenes, Marco Cuffiani, J. D. Gillies, B. Poli, V. H. Winterer, G. Giacomelli, I. Wingerter, M. W. Redmond, Ehud Duchovni, M. A. Whalley, R. W. L. Jones, H. Mes, I. P. Duerdoth, J. M. Roney, G. Maringer, F. S. Merritt, J. Goldberg, Tohru Takeshita, P. Pfister, E. K. U. Gross, G. A. Snow, E.J. Prebys, Silvia Arcelli, A. Rollnik, C. P. Ward, H. Ihssen, P. Le Du, A. Gaidot, D. R. Rust, S. W. O'Neale, Peter R Hobson, H. Jeremie, B. Nellen, R. E. Hughes-Jones, M. Kuwano, H. Kreutzmann, M. S. Dixit, B. Panzer-Steindel, S. W. Gensler, G. Mikenberg, A. Buijs, Georges Azuelos, J. C. Armitage, Frans Meijers, S. R. Hou, L. Janissen, T. Mouthuy, D. E. Klem, U. Maur, P. Leblanc, D. J. Miller, Ken W Bell, John Baines, M. Sasaki, P. Lennert, V. Gibson, P. Routenburg, Max Weber, J. G. Layter, C. Moisan, R. J. Barlow, H. Przysiezniak, J. Mildenberger, J. P. Walker, D. E. Plane, M. J. Goodrick, I. Cohen, J. C. Hill, P. Teixeira-Dias, R. F. McGowan, N. K. Watson, A. Dieckmann, Harold Nguyen, B. C. Shen, Stephen Hillier, F. Lamarche, Gunter Quast, G. M. Dallavalle, R. J. Hemingway, N. I. Geddes, Shlomo Dado, D. R. Ward, Phillip Allport, S. Wotton, S. Bougerolle, W. J. Collins, H. O. Ogren, Christoph Geich-Gimbel, G. J. VanDalen, B. P. O'Neill, D. J.P. Dumas, R. Van Kooten, M. H. Lehto, S. Sanghera, O. Runolfsson, M. Weymann, M. W. Moss, M. Sproston, P. S. Wells, M. M. Deninno, J. Kroll, G. Eckerlin, R. Sobie, P. Jovanovic, W. G. Scott, C. J. Virtue, A. M. Rossi, T. Tsukamoto, S. L. Lloyd, C. J. Oram, F. X. Gentit, Austin Ball, P. W. Jeffreys, R. Kowalewski, M. Jimack, G. D. Lafferty, X. C. Lou, W. R. Gibson, Terry Richard Wyatt, A. T. Watson, J. Hagemann, P. M. Hattersley, M. Coupland, J. E. Conboy, D. Menszner, J. P. Martin, M. Ogg, C. Ho, S. J. Pawley, C. Wahl, J. M. Lorah, Gideon Alexander, K. J. Anderson, Alessandro Montanari, T. J. Smith, S. De Jong, A. Beck, E. Heflin, Paolo Capiluppi, T. W. Pritchard, Claus Kleinwort, Claudio Grandi, L. Köpke, A. Pouladdej, R. G. Kellogg, Lorne Levinson, O. Schaile, D. C. Imrie, B. Holl, W. Mohr, M. Hansroul, C. P. Howarth, M. J. Losty, L. Lessard, C. Y. Chang, B. W. Kennedy, Gilles Beaudoin, Stefano Marcellini, P. Debu, J. E. Pilcher, G. P. Siroli, J. Banks, P. Taras, Mitsuaki Nozaki, P. A. Elcombe, I. Zacharov, S. Weisz, R. D. Heuer, D. Van den plas, Horst Breuker, C. Fukunaga, D. Hochman, N. J. Thackray, D. L. Rees, J. Becker, M. Hauschild, R. J. Homer, P. Paschievici, A. Astbury, J. L. Pinfold, O. Ganel, A. J. Martin, K. Riles, P R Poffenberger, C. K. Hargrove, S. Levegrün, S. Schreiber, R. Mir, H. Oh, T. J. McMahon, J. Allison, G. Duckeck, D. Strom, G. T. Zorn, H. M. Bosch, R. K. Carnegie, Wolfram Dietrich Zeuner, J. A. Wilson, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, M. Fincke-Keeler, P. G. Murphy, M. J. Oreglia, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, W. Schappert, D. A. Hinshaw, A. Simon, Otmar Biebel, D. G. Charlton, M. Couch, R. Humbert, J. T.M. Chrin, T. Kawamoto, S. Orito, John H. Schwarz, Michael Dittmar, G. Yekutieli, A. A. Carter, P. Mättig, I. J. Bloodworth, M. Settles, J. von Krogh, G. W. Wilson, P. Ashton, Dave Robinson, D. Karlen, C. M. Hawkes, M. Cooper, Daniel Lellouch, R. Shypit, and Takehiko Mori
Subjects: Nuclear physics, Physics, Coupling constant, Nuclear and High Energy Physics, Pion, Muon, Electron–positron annihilation, Weinberg angle, Electron, Pseudovector, Lepton
Abstract: From a sample of 3308 e + e − → τ + τ − events with an estimated background of 1.9%, we find 964 τ → e ν ν , 903 τ → μν ν , and 309 τ → π( K )ν candidates. Efficiency and background estimates determined from both Monte Carlo and control sample studies yield the following branching ratios: B(τ → e ν ν ) = 17.4 ± 0.5 ( stat ) ± 0.4 ( sys )% , B(τ → μν ν ) = 16.8 ± 0.5 ± 0.4%, and B(τ → π( K )ν) = 12.1 ± 0.7 ± 0.5% . These values are in good agreement with previous measurements. The measured lepton branching ratios, when combined with the world-average measured value for the τ lifetime, yield a ratio of the τ Fermi coupling constant to that of the lighter leptons given by G τ / G e, μ = 0.92 ± 0.04, where it is assumed G e = G μ ≡ G e , μ . The average τ polarization at the Z° resonance is measured to be −0.01±0.09 from an analysis of the momentum spectra of the electron, muon, and pion candidates, implying that the ratio of vector to axial vector couplings of the τ to the Z° is ν τ / α τ = 0.01 ± 0.04. The measurements of the average polarizations in the forward and backward hemispheres lead to the efficiency-corrected, forward-backward polarization asymmetry A FB pol = −0.22 ± 0.10, implying for the electron couplings to the Z° the ratio ν e / α e = 0.15±0.07. Since these values for the tau and electron couplings are consistent with one another, we assume lepton universality to derive ν / α = 0.05 ± 0.04 and a value for the weak mixing angle of sin 2 θ W = 0.237 ± 0.009 , with no ambiguity introduced by the relative signs of ν and α.
Published: 1991
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21. 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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22. 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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23. 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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24. 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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25. A Determination of $\ alpha_{s}(M_{Z0})$ at LEP using Resummed QCD Calculations

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

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

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

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

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

28. Properties of multihadronic events with a final state photon at $\sqrt{s} = M_{Z0}$

Author: G. Beaudoin, Shlomo Dado, X. C. Lou, Giora Mikenberg, N. C. Wood, Andris Skuja, A. Simon, G. A. Snow, Otmar Biebel, C. P. Ward, H. Takeda, Tetsuro Mashimo, D. G. Charlton, B. C. Shen, J. von Krogh, F. G. Oakham, P. Singh, J. G. Layter, H. O. Ogren, M. Couch, J. Banks, A. K. Honma, W. G. Scott, Christoph Geich-Gimbel, S. Weisz, R. D. Heuer, M. M. Deninno, Kiyotomo Kawagoe, W. Gorn, T. Mouthuy, D. E. Plane, A. Gaidot, R. Humbert, Fabrizio Fabbri, J. Kroll, J. M. Roney, R. W. L. Jones, R. Kowalewski, M. Kuwano, A. D. Schaile, N. Wermes, D. Van den plas, Ehud Duchovni, G. A. Bahan, H. Przysiezniak, M. Sproston, P. Weber, M. J. Losty, Paul Kyberd, F. K. Loebinger, M. Jobes, U. Binder, P. Scharff-Hansen, M. Yurko, P. Ashton, Dave Robinson, F. X. Gentit, J. E. Conboy, M. Ogg, P. Routenburg, R. Shypit, P. W. Jeffreys, T. Kawamoto, O. Schaile, M. W. Redmond, S. Sanghera, W. J. Larson, L. A. del Pozo, S. Schreiber, T. J. McMahon, P. S. Wells, C. J. Virtue, Terry Richard Wyatt, Stephen Hillier, G. M. Dallavalle, H. Ihssen, P. Le Du, H. Kreutzmann, V. H. Winterer, A. M. Lee, A. Rollnik, M. Hansroul, A. Dieckmann, A. Pouladdej, D. R. Rust, J. Schwiening, R. K. Carnegie, B. Panzer-Steindel, S. Orito, J. D. Gillies, K. J. Anderson, M. Rosvick, P. E.L. Clarke, S. W. Gensler, J. A. Wilson, M. Coupland, P. A. Elcombe, D. J.P. Dumas, R. Mir, H. Mes, H. Oh, F. S. Merritt, P. Lennert, S. R. Hou, A. M. Smith, R. J. Barlow, D. J. Miller, T. Kobayashi, K. Stephens, D. E. Klem, H. E. Stier, I. P. Duerdoth, G. Vasseur, J. R. McNutt, Gideon Bella, W. Schappert, D. Axen, Tohru Takeshita, B. Lorazo, R. J. Homer, G. G. Hanson, M. F. Turner, P. G. Estabrooks, D. L. Rees, R. Yaari, S. Bethke, J. A. McKenna, R. K. Keeler, Marco Cuffiani, J. Becker, C. Fukunaga, J. Mildenberger, Harold Nguyen, S. W. O'Neale, S. Bougerolle, H. J. Burckhart, Jacqueline Batley, A. Jawahery, F. Lamarche, Peter R Hobson, N. I. Goddes, M. J. Oreglia, Georges Azuelos, P. Poffenberger, A. M. Rossi, Phillip Allport, B. B. Brabson, Margret Fincke-Keeler, V. Gibson, R. J. Hemingway, D. G. Fong, J. F. Kral, R. F. McGowan, K. W. Bell, G. Quast, J. Gascon, R. Van Kooten, T. Tsukamoto, S. Levegrün, C. Wahl, G. Giacomelli, D. Pitman, Max Weber, H. von der Schmitt, John Baines, O. Runolfsson, J. R. Carter, M. H. Lehto, G. N. Patrick, H. M. Fischer, Michael Dittmar, G. Eckerlin, G. Yekutieli, J. C. Hill, Misao Sasaki, C. P. Howarth, P. M. Watkins, P. Jovanovic, E.J. Prebys, T. J. Smith, Austin Ball, D. Menszner, W. R. Gibson, J. W. Gary, John Hobbs, C. Ho, Claudio Grandi, A. Michelini, A. C. Janissen, J. E. Pilcher, Marcello Mannelli, P. Pfister, M. Jimack, G. Tysarczyk-Niemeyer, Alessandro Montanari, Claude Leroy, Gideon Alexander, Paolo Capiluppi, P. Schenk, D. R. Ward, John Allison, M. W. Moss, G. Transtromer, A. Beck, B. P. O'Neill, J. P. Pansart, M. S. Dixit, Frans Meijers, E. Heflin, A. A. Carter, C. Y. Chang, R. M. Brown, J. M. Lorah, F. C. Grant, M. A. Whalley, P. M. Hattersley, J. Hart, Lorne Levinson, M. Hauschild, Peter Sherwood, R. G. Kellogg, W. Mohr, P. Taras, B. W. Kennedy, Mitsuaki Nozaki, Y. Yang, P. Paschievici, Stefano Marcellini, S. A. Robins, J. P. Martin, A. Buijs, C. Moisan, J. P. Walker, J. L. Pinfold, James Letts, S. J. Pawley, P. Teixeira-Dias, D. C. Imrie, P. F. Harrison, P. Berlich, S. De Jong, P. Mättig, P. D. Acton, Stephen Lloyd, I. Wingerter, Claus Kleinwort, L. Köpke, G. P. Siroli, P. Debu, Silvia Arcelli, W. J. Collins, R. W. Springer, Alexander Wagner, Randall Sobie, G. D. Lafferty, J. Hagemann, J. Ludwig, G. J. Van Dalen, N. K. Watson, D. Hochman, N. J. Thackray, K. Runge, P. Bock, F. Odorici, Sachio Komamiya, T. W. Pritchard, E. Ros, A. T. Watson, T. P. Kokott, Rene Brun, C. M. Hawkes, M. Cooper, B. Boden, B. Poli, S. Wotton, Daniel Lellouch, M. Weymann, P. Igo-Kemenes, G. Maringer, H. Jeremie, R. E. Hughes-Jones, U. Maur, Takehiko Mori, D. A. Hinshaw, J. Goldberg, B. Nellen, T. Behnke, P. Leblanc, B. Holl, I. J. Bloodworth, M. J. Goodrick, G. Duckeck, R. Ströhmer, I. Cohen, D. Strom, G. T. Zorn, I. Zacharov, M. Settles, H. M. Bosch, Wolfram Dietrich Zeuner, Horst Breuker, Erez Etzion, Gareth J. Barker, G. W. Wilson, Shlomit Tarem, D. Karlen, S. Rossberg, C. J. Oram, R. P. Middleton, A. Astbury, O. Ganel, A. J. Martin, K. Riles, and C. K. Hargrove
Subjects: Physics, Quantum chromodynamics, Jet (fluid), Particle physics, Photon, Physics and Astronomy (miscellaneous), Strong interaction, Hadron, Nuclear physics, Yield (chemistry), High Energy Physics::Experiment, Constant (mathematics), Engineering (miscellaneous), Event (particle physics), Particle Physics - Experiment
Abstract: The properties of final state photons in multihadronic decays of theZ0 and those of the recoiling hadronic system are discussed and compared with theoretical expectations. The yield of two and three jet events with final state photons is found to be in good agreement with the expectation from a matrix element calculation ofO(ααs. Uncertainties in the interpretation of the theoretical calculation do not yet permit a final assessment of events with just one reconstructed jet. Comparing the rates of two jet events with a photon to those of three jet events in the inclusive multihadronic sample, the strong coupling constant in second order is determined asαs$(M_{Z^0 } )$=0.122±0.010, taking into account only the statistical and experimental systematic errors. It is found that an abelian model of the strong interaction does not describe the data. The comparison of the total yield and the jet rates with QCD shower programs shows better agreement with the ARIADNE model than with the JETSET model. Both programs are found to describe well the photon properties and the properties of the residual hadronic event.
Published: 1991

29. Decay mode independent search for a light Higgs boson and new scalars

Author: Takehiko Mori, M. Jobes, R. P. Middleton, P. Scharff-Hansen, W. J. Larson, B. C. Shen, H. Ihssen, F. S. Merritt, L. Levinson, J. M. Lorah, R. Van Kooten, O. Schaile, M. H. Lehto, A. M. Smith, O. Ganel, K. Riles, D. Karlen, A. Dieckmann, J. Goldberg, T. J. Smith, I. J. Bloodworth, C. Moisan, James D Gillies, M. Settles, E. Duchovni, G. Eckerlin, G. P. Siroli, G. Beaudoin, U. Maur, B. Nellen, R. M. Brown, Phillip Allport, Andris Skuja, P. Mättig, J. A. McKenna, S. J. Pawley, Gunter Quast, N. C. Wood, S. Levegrün, Claus Kleinwort, G. W. Wilson, F. C. Grant, M. A. Whalley, L. Köpke, G. Tysarczyk-Niemeyer, D. G. Charlton, Sachio Komamiya, R. W.L. Jones, P. Singh, A. M. Lee, Kiyotomo Kawagoe, A. Beck, J. P. Martin, P. Bock, D. Strom, M. Couch, G. T. Zorn, L. Lessard, B. P. O'Neill, J. Ludwig, Tetsuro Mashimo, C. P. Howarth, A. Buijs, E. Ros, J. Becker, K. Stephens, P. Teixeira-Dias, D. E. Plane, W. R. Gibson, E. Etzion, M. Kuwano, Stephen Hillier, J. Gascon, K. J. Anderson, C. J. Oram, J. M. Roney, J. E. Pilcher, R. Yaari, G. Maringer, J. C. Armitage, J. Hagemann, P. Jovanovic, Wolfram Dietrich Zeuner, P. Pfister, J. von Krogh, R. F. McGowan, O. Biebel, M. Jimack, John Allison, A. Michelini, G. N. Patrick, R. Shypit, G. Transtromer, G. A. Snow, C. P. Ward, A. J. Martin, Rene Brun, B. Holl, G. M. Dallavalle, R. Ströhmer, R. Kowalewski, S. Schreiber, J. T.M. Chrin, P. Weber, T. P. Kokott, Austin Ball, W. Schappert, W. G. Scott, P. Ashton, W. Gorn, N. Wermes, J. Mildenberger, Dave Robinson, P. D. Acton, C. Y. Chang, M. S. Dixit, P. Kyberd, Paolo Capiluppi, G. Yekutieli, G. A. Bahan, J. Banks, G. Azuelos, A. D. Schaile, P. A. Elcombe, H. O. Ogren, I. Zacharov, Horst Breuker, Alan Watson, L. A. del Pozo, Alessandro Montanari, T. Kawamoto, Mitsuaki Nozaki, J. Hart, Tohru Takeshita, R. G. Kellogg, S. Rossberg, M. Hauschild, M. Coupland, M. M. Deninno, J. P. Walker, P. Poffenberger, J. D. Hobbs, S. Weisz, R. D. Heuer, E. Gross, Fabrizio Fabbri, P. Paschievici, D. Van den plas, P. Igo-Kemenes, D. L. Rees, G. G. Hanson, H. E. Stier, Richard Keeler, G. Alexander, Y. Yang, P. F. Harrison, J. Kroll, D. Axen, Stefano Marcellini, D. J.P. Dumas, S. Orito, F. X. Gentit, G. J. VanDalen, P. M. Watkins, James Letts, P. Leblanc, D. Hochman, R. Mir, B. B. Brabson, H. Oh, D. G. Fong, H. Takeda, V. Gibson, U. Binder, Michael Dittmar, D. J. Miller, P. Routenburg, H. von der Schmitt, J. E. Conboy, W. Mohr, Stephen Lloyd, D. R. Rust, P. W. Jeffreys, M. Cooper, X. C. Lou, M. Sproston, P. Lennert, M. W. Moss, B. Boden, J. L. Pinfold, T. W. Pritchard, A. Wagner, John Baines, J. W. Gary, R. K. Carnegie, R. Sobie, A. Jawahery, I. Wingerter, S. Sanghera, M. F. Turner, P. S. Wells, Silvia Arcelli, P. E.L. Clarke, T. Behnke, Misao Sasaki, N. K. Watson, D. E. Klem, E.J. Prebys, Harold Nguyen, P. M. Hattersley, P. Schenk, D. Menszner, C. K. Hargrove, A. Rollnik, Peter Sherwood, F. G. Oakham, H. Jeremie, H. Kreutzmann, R. W. Springer, G. Duckeck, P. Taras, S. Bougerolle, S. Dado, H. M. Fischer, T. J. McMahon, Marcello Mannelli, A. A. Carter, M. Ogg, M. J. Oreglia, V. H. Winterer, C. Ho, B. Poli, R. E. Hughes-Jones, J. R. McNutt, N. I. Geddes, R. J. Barlow, F. Odorici, J. Schwarz, D. R. Ward, J. R. Carter, E. Heflin, J. P. Pansart, A. Gaidot, M. J. Goodrick, M. Hansroul, S. W. Gensler, T. Kobayashi, J. A. Wilson, P. Le Du, Frans Meijers, D. A. Hinshaw, T. Mouthuy, Richard J Hemingway, G. J. Barker, S. Bethke, B. W. Kennedy, G. Vasseur, S. Wotton, I. Cohen, A. Simon, M. Weymann, B. Panzer-Steindel, S. W. O'Neale, H. Mes, R. J. Homer, O. Runolfsson, F. K. Loebinger, Peter R Hobson, Marco Cuffiani, H. M. Bosch, D. C. Imrie, J. G. Layter, L. Janissen, I. P. Duerdoth, F. Lamarche, G. Giacomelli, M. W. Redmond, Claudio Grandi, H. Przysiezniak, A. M. Rossi, P. Debu, T. Tsukamoto, A. Pouladdej, G. Mikenberg, Gideon Bella, A. Astbury, H. J. Burckhart, Jacqueline Batley, R. Humbert, John Hill, S. De Jong, C. Geich-Gimbel, S. A. Robins, M. J. Losty, M. Fincke-Keeler, K. Runge, C. J. Virtue, M. Weber, N. J. Thackray, T. R. Wyatt, S. Tarem, S. R. Hou, C. Fukunaga, C. Wahl, C. Leroy, B. Lorazo, W. J. Collins, G. D. Lafferty, K. W. Bell, P. G. Estabrooks, C. M. Hawkes, and Daniel Lellouch
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Phenomenology, Scalar (mathematics), Elementary particle, Scalar boson, Higgs field, symbols.namesake, symbols, Higgs boson, High Energy Physics::Experiment, Higgs mechanism, Particle Physics - Experiment, Minimal Supersymmetric Standard Model, Boson
Abstract: Using data from e + e − collisions collected with the OPAL detector during the 1990 LEP run, a search was mode for a low mass Higgs boson (H 0 ) with arbitrary decay mode. The existence of a minimal standard model H 0 with mass in the range 0 ⩽ m H ⩽ 11.3 GeV/ c 2 is excluded at the 95% confidence level for all possible decay modes of the H 0 . Limits on the production of Higgs bosons predicted by the minimal supersymmetric standard model and new scalar particles that couple to the Z 0 are presented as a function of the scalar mass.
Published: 1991

30. A study of Bose-Einstein correlations in $e^{+}e^{-}$ annihilations at LEP

Author: A. Simon, Otmar Biebel, D. G. Charlton, M. Couch, N. C. Wood, R. Humbert, J. T.M. Chrin, P. W. Jeffreys, J. Hart, T. Kawamoto, A. M. Lee, G. A. Snow, C. P. Ward, P. Pfister, O. Schaile, S. Orito, John H. Schwarz, Y. Yang, R. Mir, H. Oh, P. F. Harrison, J. C. Armitage, P. D. Acton, Stephen Lloyd, P. Igo-Kemenes, G. Maringer, H. Jeremie, R. E. Hughes-Jones, U. Maur, Andris Skuja, G. Beaudoin, M. J. Oreglia, D. R. Rust, J. M. Lorah, P. Lennert, W. Mohr, J. R. Carter, G. N. Patrick, Phillip Allport, Shlomo Dado, C. Wahl, F. S. Merritt, H. Przysiezniak, C. M. Hawkes, M. Cooper, Daniel Lellouch, Gideon Bella, Tetsuro Mashimo, P. A. Elcombe, C. P. Howarth, X. C. Lou, M. Hansroul, J. E. Pilcher, R. Van Kooten, M. H. Lehto, F. Odorici, D. E. Klem, D. L. Rees, D. E. Plane, H. J. Burckhart, J. Becker, Jacqueline Batley, Giora Mikenberg, Stephen Hillier, Michael Dittmar, G. J. VanDalen, G. M. Dallavalle, M. Hauschild, R. J. Homer, D. Hochman, N. J. Thackray, Gideon Alexander, J. A. McKenna, J. D. Hobbs, G. Yekutieli, P. Paschievici, K. Stephens, J. R. McNutt, O. Runolfsson, Paolo Capiluppi, S. J. Pawley, Claus Kleinwort, L. Köpke, E. K. U. Gross, Alan Watson, W. Gorn, A. Gaidot, D. J.P. Dumas, P. E.L. Clarke, T. Behnke, L. Lessard, C. Moisan, M. Kuwano, M. F. Turner, N. Wermes, G. G. Hanson, R. F. McGowan, M. Sproston, P R Poffenberger, V. Gibson, D. C. Imrie, J. P. Walker, J. Banks, P. Routenburg, A. Dieckmann, John Baines, Ehud Duchovni, A. A. Carter, P. Teixeira-Dias, S. Weisz, R. D. Heuer, Fabrizio Fabbri, Claudio Grandi, H. Mes, I. P. Duerdoth, D. Van den plas, J. D. Gillies, R. Shypit, H. O. Ogren, G. A. Bahan, P. S. Wells, C. J. Virtue, D. R. Ward, G. Transtromer, Christoph Geich-Gimbel, H. Ihssen, M. M. Deninno, D. A. Hinshaw, J. Kroll, E.J. Prebys, P. Schenk, F. X. Gentit, R. Yaari, S. Bethke, Marco Cuffiani, S. W. Gensler, C. Y. Chang, L. Janissen, W. R. Gibson, M. Coupland, J. E. Conboy, T. Kobayashi, C. Ho, M. Ogg, G. P. Siroli, P. Taras, P. Singh, A. Beck, E. Heflin, M. Jobes, U. Binder, A. Pouladdej, M. S. Dixit, S. Schreiber, Frans Meijers, R. M. Brown, Lorne Levinson, Mitsuaki Nozaki, R. J. Barlow, B. W. Kennedy, P. Scharff-Hansen, T. J. McMahon, R. W. L. Jones, D. J. Miller, Richard Keeler, P. Le Du, W. J. Larson, R. K. Carnegie, H. Kreutzmann, B. Panzer-Steindel, R. J. Sobie, J. P. Martin, John Hill, J. W. Gary, J. A. Wilson, S. De Jong, G. Giacomelli, W. Schappert, A. M. Smith, P. Debu, Claude Leroy, J. P. Pansart, N. K. Watson, F. C. Grant, G. Vasseur, M. A. Whalley, B. Lorazo, J. von Krogh, J. G. Layter, M. W. Moss, F. Lamarche, P. Ashton, Dave Robinson, B. B. Brabson, A. Buijs, D. G. Fong, L. A. del Pozo, P. M. Hattersley, R. J. Hemingway, J. Gascon, S. Sanghera, H. von der Schmitt, Kiyotomo Kawagoe, K. J. Anderson, A. P. Wagner, Marcello Mannelli, J. M. Roney, P. Jovanovic, P. Weber, S. W. O'Neale, Peter R Hobson, Austin Ball, D. Menszner, Sachio Komamiya, E. Ros, Alessandro Montanari, T. P. Kokott, Rene Brun, Tohru Takeshita, H. Takeda, Georges Azuelos, K. W. Bell, F. G. Oakham, Max Weber, Misao Sasaki, B. C. Shen, G. Duckeck, R. Ströhmer, D. Strom, W. G. Scott, G. T. Zorn, R. Kowalewski, H. M. Bosch, Wolfram Dietrich Zeuner, M. J. Losty, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, J. Goldberg, B. Nellen, P. Leblanc, M. J. Goodrick, I. Cohen, Erez Etzion, Gareth J. Barker, Shlomit Tarem, S. Rossberg, C. J. Oram, C. Milstene, R. P. Middleton, M. Jimack, John Allison, B. Holl, R. G. Kellogg, B. P. O'Neill, Stefano Marcellini, James Letts, I. Zacharov, J. Hagemann, Horst Breuker, Paul Kyberd, F. K. Loebinger, M. W. Redmond, A. Rollnik, J. Mildenberger, Harold Nguyen, Gunter Quast, H. E. Stier, P. G. Estabrooks, S. Bougerolle, W. J. Collins, G. D. Lafferty, P. M. Watkins, I. Wingerter, Silvia Arcelli, T. W. Pritchard, A. Astbury, H. M. Fischer, O. Ganel, A. Michelini, A. J. Martin, A. D. Schaile, K. Riles, S. Wotton, G. Eckerlin, M. Weymann, S. A. Robins, C. K. Hargrove, V. H. Winterer, T. R. Wyatt, S. R. Hou, T. Mouthuy, C. Fukunaga, J. L. Pinfold, A. M. Rossi, T. Tsukamoto, S. Levegrün, Takehiko Mori, N. I. Geddes, B. Boden, B. Poli, T. J. Smith, P. Mättig, I. J. Bloodworth, M. Settles, G. W. Wilson, D. Karlen, and Margret Fincke-Keeler
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Electron–positron annihilation, Hadron, Detector, Function (mathematics), Bose–Einstein correlations, Radius, Nuclear physics, Pion, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: Bose-Einstein correlations between like-sign charged track pairs have been studied in e + e − annihilation hadronic events at centre-of-mass energies around the Z 0 peak as a function of Q , the four-momentum difference of the pair. The measurement was performed with the OPAL detector at LEP. Assuming the charged tracks to be pions, the observed Bose-Einstein enhancement was used to extract the values of the strength of the effect and the radius of the pion emitting source, which were found to be λ =0.866±0.032±0.140 and R 0 =0.928±0.019±0.150 fm, respectively, where the first error is statistical and the second is systematic. The results do not show significant variation in comparison to e + e − annihilation measurements at lower centre-of-mass energies. If non-pion track contamination is taken into account, the value of the strength λ becomes consistent with unity.
Published: 1991

31. A study of $K_{S}^{0}$ production in $Z^{0}$ decays

Author: J. R. McNutt, C. Milstene, W. G. Scott, Sachio Komamiya, A. T. Watson, I. J. Bloodworth, N. C. Wood, J. Goldberg, B. Nellen, A. Simon, R. Kowalewski, V. Gibson, Otmar Biebel, H. O. Ogren, John Baines, F. Odorici, G. A. Snow, C. P. Ward, R. J. Sobie, Christoph Geich-Gimbel, T. P. Kokott, Rene Brun, G. Maringer, G. Beaudoin, C. Y. Chang, Shlomo Dado, P. Leblanc, M. Settles, X. C. Lou, P. G. Murphy, Giora Mikenberg, Michael Dittmar, H. M. Fischer, G. Yekutieli, D. G. Charlton, D. A. Hinshaw, H. Jeremie, P. Taras, M. Couch, M. J. Goodrick, M. M. Deninno, I. Cohen, Claude Leroy, J. Kroll, R. Humbert, Mitsuaki Nozaki, Silvia Arcelli, R. E. Hughes-Jones, U. Maur, D. R. Ward, M. J. Losty, P. Igo-Kememes, J. P. Martin, A. A. Carter, A. Michelini, J. P. Pansart, F. X. Gentit, J. E. Conboy, H. Takeda, S. De Jong, M. Ogg, Phillip Allport, J. T.M. Chrin, G. W. Wilson, B. P. O'Neill, M. A. Whalley, C. Wahl, F. G. Oakham, E. K. U. Gross, A. Gaidot, M. Hansroul, A. Pouladdej, M. Kuwano, B. Panzer-Steindel, J. Hagemann, D. R. Rust, M. Sproston, F. S. Merritt, T. Kawamoto, A. Buijs, P. Singh, P. Debu, S. W. O'Neale, Peter R Hobson, C. P. Howarth, P. Routenburg, Erez Etzion, S. Orito, John H. Schwarz, P. Lennert, F. Lamarche, Gareth J. Barker, R. J. Hemingway, A. Dieckmann, D. Hochman, R. J. Homer, R. Mir, N. J. Thackray, H. Oh, Shlomit Tarem, J. E. Pilcher, S. A. Robins, S. Schreiber, H. Mes, I. P. Duerdoth, R. W. L. Jones, P. A. Elcombe, J. D. Hobbs, G. G. Hanson, S. Rossberg, C. J. Oram, P. E.L. Clarke, P. Jovanovic, Tohru Takeshita, T. Behnke, T. J. McMahon, Austin Ball, C. Moisan, J. P. Walker, R. P. Middleton, D. Menszner, D. L. Rees, J. Becker, M. J. Oreglia, P. Le Du, H. Kreutzmann, Georges Azuelos, P. S. Wells, P. Teixeira-Dias, Alessandro Montanari, C. J. Virtue, J. Schwiening, R. F. McGowan, K. J. Anderson, M. Hauschild, G. J. VanDalen, S. Wotton, Terry Richard Wyatt, R. K. Carnegie, D. E. Klem, M. Coupland, J. R. Carter, N. K. Watson, K. W. Bell, P. Paschievici, G. N. Patrick, M. F. Turner, H. Przysiezniak, R. Yaari, S. Bethke, Max Weber, J. D. Gillies, Marco Cuffiani, J. C. Hill, M. Weymann, Misao Sasaki, J. A. Wilson, Gideon Bella, J. M. Lorah, G. Duckeck, P R Poffenberger, T. Mouthuy, R. J. Barlow, Gideon Alexander, D. J. Miller, H. J. Burckhart, W. Mohr, Jacqueline Batley, Paolo Capiluppi, W. Schappert, H. E. Stier, O. Schaile, L. Janissen, D. Strom, P. G. Estabrooks, J. von Krogh, J. Hart, R. K. Keeler, A. M. Rossi, G. T. Zorn, P. Ashton, Dave Robinson, T. Tsukamoto, S. Levegrün, H. M. Bosch, N. I. Geddes, P. M. Watkins, B. Poli, Wolfram Dietrich Zeuner, O. Runolfsson, Y. Yang, I. Wingerter, L. Lessard, J. Banks, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Claudio Grandi, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Bock, P. F. Harrison, P. W. Jeffreys, S. Weisz, R. D. Heuer, A. M. Lee, Stephen Lloyd, Fabrizio Fabbri, D. Van den plas, R. Van Kooten, M. H. Lehto, N. Wermes, S. Bougerolle, W. J. Collins, G. D. Lafferty, T. W. Pritchard, Ehud Duchovni, R. Shypit, A. D. Schaile, Andris Skuja, V. H. Winterer, S. R. Hou, S. J. Pawley, Claus Kleinwort, L. Köpke, H. Ihssen, Tetsuro Mashimo, S. W. Gensler, C. Fukunaga, T. Kobayashi, W. Gorn, G. A. Bahan, G. Giacomelli, B. B. Brabson, E.J. Prebys, D. G. Fong, P. Schenk, J. Gascon, H. von der Schmitt, Frans Meijers, J. L. Pinfold, Marcello Mannelli, M. Jobes, U. Binder, P. Scharff-Hansen, W. J. Larson, J. G. Layter, J. W. Gary, D. Karlen, A. M. Smith, C. M. Hawkes, M. Cooper, Daniel Lellouch, Takehiko Mori, G. Vasseur, B. Lorazo, D. E. Plane, S. Sanghera, Stephen Hillier, G. M. Dallavalle, D. J.P. Dumas, W. R. Gibson, C. Ho, A. Beck, E. Heflin, R. M. Brown, Lorne Levinson, B. W. Kennedy, T. J. Smith, P. Mättig, B. Holl, I. Zacharov, Horst Breuker, J. Mildenberger, Harold Nguyen, Gunter Quast, M. S. Dixit, Paul Kyberd, F. K. Loebinger, Margret Fincke-Keeler, A. Astbury, M. W. Redmond, A. Rollnik, O. Ganel, A. J. Martin, K. Riles, M. Jimack, John Allison, G. Eckerlin, C. K. Hargrove, P. Pfister, R. G. Kellogg, Stefano Marcellini, J. C. Armitage, M. W. Moss, P. M. Hattersley, D. C. Imrie, G. P. Siroli, Kiyotomo Kawagoe, A. P. Wagner, J. M. Roney, B. C. Shen, and K. Stephens
Subjects: Quantum chromodynamics, Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Nuclear physics, Momentum, High Energy Physics::Experiment, Center of mass, Event (particle physics), Particle Physics - Experiment
Abstract: The production of K0 mesons in e+e− interactions at center of mass energies in the region of the Z0 mass has been investigated with the OPAL detector at LEP. The rate is found to be 2.10±0.02±0.14 K 0 , Z 0 per hadronic event. The predictions from the JETSET and HERWIG generators agree very well with both the rate and the scale invariant cross section (1/σhadβ) (dσ/dxE) for K0 production. Comparisons of the inclusive momentum spectrum with predictions of an analytical QCD formula and with data from lower center of mass energies are presented.
Published: 1991

32. A measurement of photon radiation in lepton pair events from Z0 decays

Author: G. G. Hanson, G. Beaudoin, S. Schreiber, G. Giacomelli, T. J. McMahon, E.J. Prebys, G. Vasseur, J. Schwiening, R. K. Carnegie, M. S. Dixit, Frans Meijers, Shlomo Dado, J. P. Pansart, J. A. Wilson, H. E. Stier, C. Wahl, W. Schappert, B. C. Shen, X. C. Lou, P. G. Estabrooks, J. Mildenberger, Harold Nguyen, N. I. Geddes, C. P. Howarth, W. J. Collins, O. Runolfsson, G. Eckerlin, Giora Mikenberg, W. G. Scott, J. E. Pilcher, L. Lessard, B. Boden, G. D. Lafferty, H. O. Ogren, Christoph Geich-Gimbel, H. Takeda, J. P. Martin, P. M. Watkins, B. Poli, R. Kowalewski, Claudio Grandi, N. C. Wood, Paul Kyberd, F. K. Loebinger, C. M. Hawkes, D. Axen, M. W. Redmond, A. Rollnik, M. Jimack, M. Cooper, Daniel Lellouch, F. G. Oakham, John Hill, S. De Jong, John Allison, P. Igo-Kemenes, T. W. Pritchard, R. G. Kellogg, J. von Krogh, M. M. Deninno, P. E.L. Clarke, T. Mouthuy, M. J. Losty, M. Yurko, Stefano Marcellini, I. Wingerter, Takehiko Mori, P. W. Jeffreys, James Letts, F. Lamarche, P. Singh, R. J. Hemingway, R. Mir, A. M. Lee, H. Oh, G. A. Snow, C. P. Ward, P. Ashton, G. Maringer, H. Jeremie, B. P. O'Neill, Dave Robinson, J. Kroll, O. Schaile, Silvia Arcelli, L. A. del Pozo, P. Jovanovic, R. E. Hughes-Jones, Austin Ball, U. Maur, R. W. L. Jones, A. M. Rossi, D. Menszner, J. E. Conboy, M. Ogg, Michael Dittmar, D. A. Hinshaw, A. K. Honma, T. Tsukamoto, S. Levegrün, Tohru Takeshita, G. Yekutieli, D. Pitman, P. Debu, Alessandro Montanari, P. Le Du, J. G. Layter, A. Pouladdej, H. Kreutzmann, B. Panzer-Steindel, D. C. Imrie, R. Yaari, S. Bethke, S. W. O'Neale, Marco Cuffiani, I. J. Bloodworth, Georges Azuelos, H. M. Fischer, J. F. Kral, K. W. Bell, A. A. Carter, M. J. Oreglia, S. Wotton, A. Michelini, P. Pfister, Gideon Bella, Max Weber, A. D. Schaile, A. C. Janissen, K. J. Anderson, J. Goldberg, M. Weymann, Misao Sasaki, M. Hauschild, J. D. Gillies, C. J. Oram, H. J. Burckhart, Jacqueline Batley, Peter R Hobson, G. P. Siroli, S. A. Robins, S. Sanghera, J. R. Carter, A. Gaidot, R. J. Barlow, P. Paschievici, H. Przysiezniak, M. Settles, V. H. Winterer, K. Stephens, G. N. Patrick, J. R. McNutt, S. Bougerolle, A. Simon, Otmar Biebel, T. Behnke, M. F. Turner, Sachio Komamiya, John Hobbs, D. G. Charlton, E. Ros, F. S. Merritt, S. R. Hou, M. Couch, B. Nellen, P. Leblanc, D. Karlen, R. Humbert, G. Duckeck, R. Ströhmer, B. Holl, T. P. Kokott, Rene Brun, C. Moisan, J. P. Walker, V. Gibson, C. Fukunaga, T. J. Smith, P. Teixeira-Dias, T. Kawamoto, Richard Keeler, D. Strom, J. A. McKenna, M. W. Moss, P. Mättig, A. Astbury, P. M. Hattersley, S. Orito, I. Zacharov, G. Quast, John Baines, G. T. Zorn, M. J. Goodrick, J. L. Pinfold, Horst Breuker, Kiyotomo Kawagoe, R. F. McGowan, I. Cohen, P. Schenk, C. Y. Chang, H. M. Bosch, F. X. Gentit, J. M. Roney, M. Fincke-Keeler, P. Taras, P. Weber, Mitsuaki Nozaki, Wolfram Dietrich Zeuner, D. R. Ward, G. Transtromer, M. Hansroul, O. Ganel, N. K. Watson, A. J. Martin, Erez Etzion, Gareth J. Barker, Claude Leroy, K. Riles, Shlomit Tarem, R. J. Homer, D. J. Miller, C. K. Hargrove, S. Rossberg, A. Jawahery, P. S. Wells, C. J. Virtue, F. Odorici, R. Shypit, Terry Richard Wyatt, D. Hochman, N. J. Thackray, G. Tysarczyk-Niemeyer, R. P. Middleton, M. Coupland, F. C. Grant, M. A. Whalley, Peter Sherwood, R. J. Sobie, R. W. Springer, Alexander Wagner, A. Buijs, J. Hagemann, J. Ludwig, K. Runge, P. Bock, H. Mes, I. P. Duerdoth, D. E. Klem, M. Jobes, U. Binder, P. Scharff-Hansen, G. W. Wilson, J. Hart, W. J. Larson, Y. Yang, P. F. Harrison, P. D. Acton, Stephen Lloyd, P. Poffenberger, A. M. Smith, N. Wermes, B. Lorazo, Ehud Duchovni, H. Ihssen, B. B. Brabson, D. G. Fong, J. Gascon, H. von der Schmitt, S. W. Gensler, T. Kobayashi, J. W. Gary, Marcello Mannelli, Andris Skuja, Phillip Allport, Tetsuro Mashimo, W. Gorn, Gideon Alexander, G. A. Bahan, Paolo Capiluppi, R. Van Kooten, M. H. Lehto, M. Rosvick, S. J. Pawley, P. Berlich, Claus Kleinwort, D. E. Plane, L. Köpke, Stephen Hillier, G. M. Dallavalle, D. R. Rust, Alan Watson, D. J.P. Dumas, P. Lennert, W. R. Gibson, C. Ho, J. Banks, A. Beck, S. Weisz, R. D. Heuer, E. Heflin, Fabrizio Fabbri, D. Van den plas, R. M. Brown, Lorne Levinson, B. W. Kennedy, M. Kuwano, M. Sproston, P. Routenburg, A. Dieckmann, J. M. Lorah, W. Mohr, P. A. Elcombe, D. L. Rees, J. Becker, and G. J. VanDalen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Annihilation, Luminosity (scattering theory), Branching fraction, OPAL detector, Resonance (particle physics), Topological definitions, Nuclear physics, Momentum, Lepton pair identification, Selection efficiency, Radiative transfer, High Energy Physics::Experiment, Particle Physics - Experiment, Lepton
Abstract: We have measured the photon yield in lepton pair events recorded by the OPAL detector in a data sample corresponding to an integrated luminosity of 7.1 pb−1 at centre-of-mass energies between 88 GeV and 94 GeV. The results are compared to QED expectations for initial and final state photon radiation. No anomalous photon yield has been found, and stringent limits on the branching ratio for exotic radiative three body Z0 decays into a photon and a pair of leptons are obtained. We also place limits on possible Z0 decays into a photon and a resonance X with subsequent decays of X into a pair of leptons. Acollinear μ+μ− events with missing momentum along the beam direction are identified as events with hard initial state photon radiation and used to measure an average cross section of 15 ±86 pb for e+e− annihilation into μ+μ−, in the so far untested range of centre-of-mass energies between 60 GeV and 84 GeV. This value is consistent with a cross section of 24 pb, expected from Z0 and photon exchange.
Published: 1991

33. A STUDY OF DIFFERENCES BETWEEN QUARK AND GLUON JETS USING VERTEX TAGGING OF QUARK JETS

Author: Paul Kyberd, F. K. Loebinger, M. W. Redmond, A. Rollnik, R. Giacomelli, M. Jimack, John Allison, Sachio Komamiya, R. G. Kellogg, D. S. Koetke, Stefano Marcellini, J. Mildenberger, Harold Nguyen, Gordon H. Hanson, James Letts, G. Beaudoin, A. Astbury, Andris Skuja, H. M. Fischer, E. Ros, Margret Fincke-Keeler, P. Singh, R. Lahmann, R. Mir, M. Yurko, P. E.L. Clarke, O. Ganel, J. Steuerer, S. Schreiber, A. J. Martin, H. Mes, D. C. Imrie, A. Michelini, A. C. Janissen, Tetsuro Mashimo, P. W. Jeffreys, F. C. Grant, T. J. McMahon, I. P. Duerdoth, P. Igo-Kemenes, G. Maringer, Shlomo Dado, J. N. Tresilian, M. A. Whalley, T. P. Kokott, Carla Sbarra, A. M. Lee, J. Schwiening, R. K. Carnegie, H. Jeremie, P. G. Estabrooks, P. A. Elcombe, R. W. L. Jones, J. A. Wilson, S. Barnett, D. Hochman, N. J. Thackray, J. P. Martin, P. Bright-Thomas, R. E. Hughes-Jones, U. Maur, X. C. Lou, C. K. Hargrove, A. Buijs, D. M. Strom, P. Pfister, G. P. Siroli, W. Gorn, Tara Shears, M. Sasaki, S. De Jong, D. R. Rust, G. A. Bahan, Christoph Schwick, Giora Mikenberg, R. J. Hemingway, I. J. Bloodworth, B. Panzer-Steindel, Tatsuo Kawamoto, J. Becker, J. Hart, W. Schappert, D. E. Plane, J. C. Clayton, G. Duckeck, R. Ströhmer, M. J. Oreglia, P. M. Watkins, C. Wahl, C. Y. Chang, P. F. Harrison, G. Giacomelli, Tohru Takeshita, H. H. Bosch, Horst Breuker, E. do Couto e Silva, P. D. Acton, G. M. Dallavalle, M. Jobes, U. Binder, Stephen Lloyd, Gideon Bella, J. E. Pilcher, M. Tecchio, R. Yaari, J. D. Gillies, S. Bethke, T. Hilse, F. Odorici, P. Bentkowski, H. J. Burckhart, T. Mouthuy, M. Settles, J. R. Carter, G. N. Patrick, O. Runolfsson, E. Helfin, P. Scharff-Hansen, Georges Azuelos, Phillip Allport, J. von Krogh, A. Simon, Wolfram Dietrich Zeuner, Marco Cuffiani, Otmar Biebel, G. E. Richards, Silvia Arcelli, A. Yeaman, M. A. Thomson, D. G. Charlton, D. L. Wagner, C. Jui, M. Foucher, H. Deng, R. Humbert, G. W. Wilson, J. W. Gary, Claudio Grandi, A. M. Smith, G. Vasseur, B. Lorazo, Norbert Wermes, James Pinfold, D. G. Fong, P. Schenk, J. Gascon, J. F. Kral, G. T. Zorn, K. W. Bell, N. I. Geddes, Max Weber, J. C. Hill, A. M. Rossi, T. Tsukamoto, B. C. Shen, S. Levegrün, A. K. Honma, W. G. Scott, N. K. Watson, D. A. Hinshaw, Dave Robinson, L. A. del Pozo, D. J. Miller, S. W. O'Neale, K. J. Anderson, A. Gaidot, M. Kuwano, T. Wlodek, M. F. Turner, M. Sproston, S. L. Chu, C. Moisan, J. P. Walker, G. A. Beck, P. Teixeira-Dias, John Hobbs, Alan Watson, D. J.P. Dumas, P. S. Wells, Terry Richard Wyatt, M. Coupland, O. Schaile, D. Karlen, C. Burgard, N. Paz-Jaoshvili, Gideon Alexander, Paolo Capiluppi, P. Taras, Mitsuaki Nozaki, G. A. Snow, C. P. Ward, D. L. Rees, H. von der Schmitt, B. W. Kennedy, R. Kowalewski, K. Stephens, J. R. McNutt, B. Schmitt, S. Orito, M. Rosvick, Marcello Mannelli, J. E. Duboscq, Ehud Duchovni, Richard Keeler, W. J. Collins, P. M. Hattersley, R. Shypit, J. M. Roney, Michael Dittmar, G. Yekutieli, H. Przysiezniak, P. Routenburg, N. Tesch, A. Dieckmann, M. S. Dixit, M. Fierro, M. Hansroul, H. Ihssen, Frans Meijers, Randall Sobie, G. D. Lafferty, V. Gibson, G. Quast, John Baines, C. H. Shepherd-Themistocleous, P. Poffenberger, Claude Leroy, J. P. Pansart, R. J. Homer, S. W. Gensler, J. G. Layter, F. G. Oakham, T. J. Smith, S. J. Hillier, T. Kobayashi, M. Hauschild, D. R. Ward, T. W. Pritchard, T. Behnke, A. A. Carter, G. Transtromer, R. Van Kooten, C. J. Virtue, F. Lamarche, B. Boden, P. Mättig, B. Poli, C. M. Hawkes, M. Cooper, M. Morii, C. Markus, Peter R Hobson, Daniel Lellouch, P. Paschievici, P. Jovanovic, Austin Ball, D. Menszner, Takehiko Mori, Kiyotomo Kawagoe, Alessandro Montanari, D. Axen, A. D. Schaile, J. R. Batley, P. Weber, J. M. Lorah, A. Jawahery, W. Mohr, G. Tysarczyk-Niemeyer, W. R. Gibson, J. Banks, Peter Sherwood, V. H. Winterer, Erez Etzion, A. Beck, R. D. Heuer, Fabrizio Fabbri, R. M. Brown, Lorne Levinson, R. W. Springer, Alexander Wagner, D. Van den plas, J. Hagemann, J. Ludwig, G. J. Van Dalen, K. Runge, P. Bock, D. Pitman, E. Torrente-Lujan, Roger Barlow, Stefan Kluth, M. H. Lehto, Shlomit Tarem, P. Berlich, L. Köpke, S. Rossberg, C. J. Oram, R. P. Middleton, J. Goldberg, B. Nellen, P. Leblanc, H. G. Evans, M. J. Goodrick, I. Cohen, H. O. Ogren, Christoph Geich-Gimbel, J. E. Conboy, J. Kroll, F. X. Gentit, A. Pouladdej, M. J. Losty, F. S. Merritt, S. Wotton, J. A. McKenna, and R. F. McGowan
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Monte Carlo method, Perturbative QCD, Vertex (geometry), Gluon, Hadronization, Nuclear physics, High Energy Physics::Experiment, Multiplicity (chemistry), Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Quark and gluon jets with equal energies are identified in three-jet hadronicZ0 events, using reconstructed secondary vertices from heavy quark decay in conjunction with energy ordering of the jets to anti-tag the gluon jets. Selection of jets from a symmetric event topology allows their properties to be compared in a simple and direct manner. The jets under study have an energy of about 24 GeV. It is observed that gluon jets have a larger angular width than quark jets and yield a softer particle energy spectrum. Correspondingly, the mean particle multiplicity is found to be larger for gluon than for quark jets. Correcting the distributions for residual misidentification of the quark and gluon jets, the ratio of mean particle multiplicty of gluon relative to quark jets is measured to be $$\frac{{\left\langle n \right\rangle _{gluon} }}{{\left\langle n \right\rangle _{quark} }} = 1.27 \pm 0.04(stat.) \pm 0.06(syst.),$$ where the jets are defined using thek⊥ jet finder. The numerical value of this ratio is found to be sensitive to the choice of the jet algorithm. The experimental results are compared to Monte Carlo calculations which incorporate perturbative QCD along with different assumptions about the hadronization process.

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33 results on '"N. J. Thackray"'

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

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

3. Measurement of the B0 and B+ lifetimes

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

5. QCD coherence studies using two particle azimuthal correlations

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

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

8. A study of the electric charge distributions of quark and gluon jets in hadronic Z0 decays

9. Inclusive neutral vector meson production in hadronicZ 0 decays

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

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

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

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

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

15. Test of CP-invariance in e+e−→Z0→τ+τ− and a limit on the weak dipole moment of the τ lepton

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

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

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

19. Measurement of three-jet distributions sensitive to the gluon spin ine + e − annihilations at $$\sqrt s = 91$$ GeV

20. Measurement of branching ratios and τ polarization from τ→eνν−,τ→μνν−,andτ→π(K)ν decays at LEP

21. A search for scalar leptoquarks in Z0 decays

22. Measurement of theZ 0 line shape parameters and the electroweak couplings of charged leptons

23. A study of - in Z0 decays

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

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

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

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

28. Properties of multihadronic events with a final state photon at $\sqrt{s} = M_{Z0}$

29. Decay mode independent search for a light Higgs boson and new scalars

30. A study of Bose-Einstein correlations in $e^{+}e^{-}$ annihilations at LEP

31. A study of $K_{S}^{0}$ production in $Z^{0}$ decays

32. A measurement of photon radiation in lepton pair events from Z0 decays

33. A STUDY OF DIFFERENCES BETWEEN QUARK AND GLUON JETS USING VERTEX TAGGING OF QUARK JETS

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33 results on '"N. J. Thackray"'

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