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1. 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

2. 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

3. The detector simulation program for the OPAL experiment at LEP

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

4. 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

5. 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

6. 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

7. The trigger system of the OPAL experiment at LEP

Author: F. K. Loebinger, T. Kobayashi, J. W. Gary, P. Farthouat, D. Scherer, G. Schuler, R. Milborrow, T. W. Pritchard, J. Feyt, K. W. Bell, John Hart, R. W. Springer, O. Schaile, K. Runge, D. Joos, M. Weymann, R. Hammarstroem, H. Gao, D. G. Charlton, R. Humbert, Gunter Quast, A. A. Macbeth, T. Hilse, M. Arignon, P. M. Watkins, R. G. Kellogg, T. Kawamoto, John H. Schwarz, C. J. Virtue, A. P. Wagner, G. W. Wilson, A. Penton, G. Ricth, S. Jaroslawski, M. Bramhall, R. D. Heuer, A. Braun, P. Le Du, J. R. Carter, C. Weber, Michael Dittmar, S. J. Pawley, A. A. Carter, J. D. Gillies, P. Jovanovic, Austin Ball, H. Takeda, J. A. Wilson, C. Greiner, Lorne Levinson, John Hill, Stephen Hillier, Giora Mikenberg, C. M. Roach, M. Webel, and D. R. Ward
Subjects: Physics, Nuclear and High Energy Physics, Wire chamber, Physics::Instrumentation and Detectors, Detector, Dead time, Particle detector, Nuclear physics, Bunches, Logic gate, Redundancy (engineering), Physics::Accelerator Physics, High Energy Physics::Experiment, Detectors and Experimental Techniques, Instrumentation, Electronic circuit
Abstract: A pretrigger system is described for running the OPAL detector at the LEP e + e − collider with more bunches than originally foreseen. A large number of low threshold pretrigger signals are formed by several independent components of the detector, and combined by a custom-built VME-based central pretrigger logic. Flexibility, high efficiency and high redundancy in all physics channels are all achieved with low additional deadtime, without any compromise to the trigger performance.
Published: 1992

8. 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

9. 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

10. 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

11. The diamond shaped cathode pads of the OPAL muon barrel drift chambers

Author: I. P. Duerdoth, O. W. Davies, G. D. Lafferty, P. S. Hinde, P. Ashton, P. G. Murphy, A. A. Macbeth, S. J. Pawley, J. Banks, R. J. Barlow, M. W. Moss, J. T.M. Chrin, F. K. Loebinger, John Allison, A.O. Dowd, R. E. Hughes-Jones, K. Stephens, and John Baines
Subjects: Physics, Nuclear and High Energy Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, business.industry, Detector, Diamond, engineering.material, Charged particle, Cathode, Anode, law.invention, Nuclear physics, Transverse plane, Optics, law, engineering, Physics::Accelerator Physics, High Energy Physics::Experiment, Collider, business, Instrumentation
Abstract: A total of 110 drift chambers, each containing two 60 cm wide drift cells with anode wires up to 10.4 m long, have been installed on the OPAL detector at the LEP electron-positron collider in CERN, Geneva. The chambers allow measurement of space points on the trajectory of a charged particle: coordinates transverse to the wire direction are reconstructed to an accuracy of 2 mm using conventional drift-time measurements, while a novel arrangement of diamond shaped cathode pads allows location of the track along the wire to an accuracy of 1.5 mm. This is achieved by three measurements of increasing ambiguity but also increasing accuracy. The techniques developed to analyse the signals from the cathode pads are described in some detail.
Published: 1991

12. 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

13. 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

14. 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

15. 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

16. 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

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

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

18. The OPAL muon barrel detector

Author: I. P. Duerdoth, A. J.P. O'Dowd, O. W. Davies, P. S. Hinde, K. Stephens, F. K. Loebinger, John Baines, Terry Richard Wyatt, M. W. Moss, P.D. Phillips, R. E. Hughes-Jones, R. F. McGowan, A. Skillman, R. J. Barlow, A. A. Macbeth, C. Beeston, J. Banks, S. Barnett, P. Ashton, P. G. Murphy, R.J. Akers, B. Nijjhar, N. C. Wood, John Allison, G. E. Richards, S. J. Pawley, J. T.M. Chrin, S.G. Clowes, N.J. Tresillian, G. A. Bahan, and G. D. Lafferty
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Muon, Physics::Instrumentation and Detectors, Hadron, Detector, Barrel (horology), High Energy Physics::Experiment, Detectors and Experimental Techniques, Instrumentation, Beam (structure), Muon detector
Abstract: The barrel part of the OPAL muon detector consists of 110 drift chambers forming four layers outside the hadron absorber. Each chamber covers an area of 1.2 m by up to 10.4 m and has two cells with wires parallel to the beam and a drift distance of 297 mm. A detailed description of the design, construction, operation and performance of the sub-detector is given. The system has been operating successfully since the start of LEP in 1989.
Published: 1995

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

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

20. 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

21. 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

22. 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

23. Observation of $J/\psi$ production in multihadronic $Z^{0}$ decays

Author: A. Astbury, O. Ganel, F. Lamarche, R. J. Hemingway, P. Jovanovic, Austin Ball, D. Menszner, Alessandro Montanari, P. Igo-Kemenes, G. Maringer, N. C. Wood, A. J. Martin, K. Riles, J. D. Hobbs, H. Jeremie, G. A. Snow, C. P. Ward, C. K. Hargrove, G. G. Hanson, R. Sobie, C. Milstene, G. Giacomelli, H. M. Fischer, R. E. Hughes-Jones, U. Maur, E.J. Prebys, E. K. U. Gross, A. Gaidot, M. Kuwano, F. Odorici, M. Jimack, John Allison, P. Routenburg, A. Michelini, M. S. Dixit, H. Przysiezniak, H. Takeda, G. N. Patrick, F. G. Oakham, R. G. Kellogg, J. D. Gillies, R. F. McGowan, A. Dieckmann, R. J. Barlow, S. A. Robins, Stefano Marcellini, H. O. Ogren, G. Beaudoin, Christoph Geich-Gimbel, N. K. Watson, Shlomo Dado, Frans Meijers, M. W. Moss, B. Holl, O. Schaile, X. C. Lou, C. M. Hawkes, M. Cooper, Daniel Lellouch, R. Shypit, Takehiko Mori, H. E. Stier, J. Goldberg, M. M. Deninno, B. Nellen, P. G. Murphy, C. Y. Chang, J. G. Layter, Giora Mikenberg, I. Zacharov, J. Kroll, P. Taras, P. G. Estabrooks, P. Leblanc, P. M. Hattersley, Mitsuaki Nozaki, Horst Breuker, F. X. Gentit, J. E. Conboy, H. Mes, I. P. Duerdoth, M. Ogg, D. R. Rust, P. M. Watkins, S. W. O'Neale, Peter R Hobson, W. R. Gibson, S. Sanghera, Paul Kyberd, F. K. Loebinger, A. Pouladdej, C. Ho, N. Wermes, T. Mouthuy, P. Schenk, A. D. Schaile, P. Lennert, P. A. Elcombe, D. A. Hinshaw, L. Janissen, P. W. Jeffreys, P. Pfister, A. Beck, A. M. Lee, M. J. Goodrick, I. Wingerter, Ehud Duchovni, D. E. Klem, Silvia Arcelli, E. Heflin, M. W. Redmond, I. Cohen, R. M. Brown, Lorne Levinson, V. H. Winterer, D. L. Rees, J. Becker, B. W. Kennedy, A. M. Rossi, A. Rollnik, K. J. Anderson, J. C. Armitage, G. J. VanDalen, H. Ihssen, T. Tsukamoto, S. Levegrün, M. Jobes, U. Binder, S. R. Hou, D. Hochman, N. J. Thackray, D. E. Plane, S. W. Gensler, Stephen Hillier, C. Moisan, J. P. Walker, Michael Dittmar, C. Wahl, G. Yekutieli, T. Kobayashi, S. Wotton, G. M. Dallavalle, K. Stephens, S. Bougerolle, J. R. McNutt, P. Teixeira-Dias, P. Scharff-Hansen, W. J. Collins, P. E.L. Clarke, T. Behnke, M. Weymann, A. A. Carter, Gunter Quast, D. J.P. Dumas, O. Runolfsson, W. J. Larson, C. P. Howarth, J. Mildenberger, Harold Nguyen, F. S. Merritt, L. Lessard, G. D. Lafferty, J. W. Gary, Phillip Allport, Claudio Grandi, J. M. Lorah, J. E. Pilcher, V. Gibson, R. Mir, T. W. Pritchard, N. I. Geddes, G. Eckerlin, A. M. Smith, H. Oh, W. Mohr, John Baines, B. Poli, R. Yaari, Erez Etzion, S. Bethke, Marco Cuffiani, G. Vasseur, B. Lorazo, Richard Keeler, Gideon Alexander, Paolo Capiluppi, Gareth J. Barker, Shlomit Tarem, D. R. Ward, J. Hart, J. Banks, P. Bock, B. C. Shen, Andris Skuja, S. Rossberg, D. C. Imrie, S. Weisz, R. D. Heuer, J. von Krogh, Y. Yang, Claude Leroy, W. G. Scott, Fabrizio Fabbri, J. P. Pansart, C. Fukunaga, P. F. Harrison, C. J. Virtue, G. P. Siroli, J. P. Martin, M. A. Whalley, D. Van den plas, R. P. Middleton, Tetsuro Mashimo, R. Kowalewski, R. Van Kooten, S. De Jong, P. Ashton, Dave Robinson, M. F. Turner, Sachio Komamiya, A. T. Watson, T. P. Kokott, Rene Brun, W. Gorn, M. J. Losty, S. Schreiber, T. J. McMahon, R. K. Carnegie, M. Hauschild, P. Paschievici, A. Buijs, P. Debu, I. J. Bloodworth, J. L. Pinfold, M. J. Oreglia, M. H. Lehto, C. J. Oram, P R Poffenberger, J. A. Wilson, M. Fincke-Keeler, M. Settles, M. Hansroul, Tohru Takeshita, G. A. Bahan, D. J. Miller, W. Schappert, S. J. Pawley, Claus Kleinwort, L. Köpke, Georges Azuelos, J. R. Carter, M. Sproston, P. S. Wells, G. Duckeck, G. W. Wilson, D. Karlen, R. J. Homer, K. W. Bell, B. P. O'Neill, Terry Richard Wyatt, D. Strom, J. Hagemann, M. Coupland, G. T. Zorn, Kiyotomo Kawagoe, B. B. Brabson, Max Weber, J. C. Hill, Misao Sasaki, A. P. Wagner, J. M. Roney, D. G. Fong, H. M. Bosch, Wolfram Dietrich Zeuner, J. Gascon, H. von der Schmitt, H. J. Bruckhart, Marcello Mannelli, A. Simon, T. J. Smith, Otmar Biebel, D. G. Charlton, M. Couch, P. Singh, R. Humbert, P. Mättig, J. T.M. Chrin, T. Kawamoto, S. Orito, John H. Schwarz, R. W. L. Jones, D. Axen, A. Jawahery, G. Tysarczyk-Niemeyer, Peter Sherwood, R. W. Springer, J. Ludwig, K. Runge, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, Gideon Bella, Jacqueline Batley, and Stephen Lloyd
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Distribution (mathematics), Energy distribution, Meson, Branching fraction, Electron–positron annihilation, Hadron, High Energy Physics::Experiment, Production (computer science), Particle Physics - Experiment
Abstract: The production of J/ψ mesons in multihadronic Z0 decays has been observed in the e+e− and β+β− final states. From a sample of approximately 45 reconstructed J ψ mesons, the inclusive branching fraction is measured to be Br(Z0→J/ψ + X) = (4.5±0.8±0.4±0.6) × 10−3, where the first error is statistical, the second systematic, and the third error is due to the uncertainty in the leptonic decay rate of the J/ψ. The J/ψ energy distribution is consistent with the distribution expected from B hadron decays. The average B hadron lifetime is calculated from the measured distances between the primary and J/ψ vertices, resulting in τB = 1.32−0.25+0.31±0.15 ps, where the first error is statistical and the second systematic.
Published: 1991

24. 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

25. 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

26. A direct observation of quark-gluon jet differences at LEP

Author: H. E. Stier, P. G. Estabrooks, I. J. Bloodworth, P. M. Watkins, S. W. O'Neale, Peter R Hobson, N. K. Watson, M. Settles, Sachio Komamiya, T. P. Kokott, Rene Brun, R. W. L. Jones, R. Mir, H. O. Ogren, H. Oh, I. Wingerter, G. W. Wilson, A. H. Ball, Silvia Arcelli, P. Igo-Kemenes, G. Maringer, D. Karlen, P. Le Du, H. Kreutzmann, B. Panzer-Steindel, G. Giacomelli, H. Jeremie, R. E. Hughes-Jones, U. Maur, M. M. Deninno, J. Kroll, Gideon Bella, F. X. Gentit, M. J. Oreglia, C. Geich-Gimbel, H. J. Burckhart, Jacqueline Batley, J. E. Conboy, M. Ogg, S. Wotton, B. P. O'Neill, F. Lamarche, A. Pouladdej, P. E.L. Clarke, T. Behnke, J. G. Layter, M. Weymann, J. Hagemann, R. J. Hemingway, F. S. Merritt, J. R. Carter, G. N. Patrick, G. Duckeck, P. Jovanovic, A. Simon, Otmar Biebel, D. Strom, J. M. Lorah, S. Sanghera, W. Mohr, G. T. Zorn, D. Menszner, D. G. Charlton, G. Beaudoin, M. Couch, H. M. Bosch, Wolfram Dietrich Zeuner, Alessandro Montanari, R. Humbert, P. Pfister, R. Yaari, J. P. Martin, Shlomo Dado, R. F. McGowan, J. T.M. Chrin, S. Bethke, Marco Cuffiani, John Hill, D. E. Plane, E. K. U. Gross, A. Gaidot, S. De Jong, Stephen Hillier, M. Kuwano, T. Kawamoto, J. C. Armitage, M. Sproston, J. Hart, P. Routenburg, G. M. Dallavalle, X. C. Lou, P. G. Murphy, Erez Etzion, A. Dieckmann, H. Takeda, P. Debu, P. A. Elcombe, S. Orito, John H. Schwarz, Shlomit Tarem, C. Milstene, C. M. Hawkes, Y. Yang, Alan Watson, D. J.P. Dumas, F. G. Oakham, Giora Mikenberg, S. Rossberg, M. Cooper, Daniel Lellouch, J. D. Hobbs, M. Hansroul, D. A. Hinshaw, R. Shypit, Takehiko Mori, P. F. Harrison, R. P. Middleton, D. L. Rees, J. Becker, B. Holl, G. G. Hanson, H. Przysiezniak, J. Goldberg, N. C. Wood, J. D. Gillies, Stephen Lloyd, G. J. VanDalen, S. Bougerolle, W. J. Collins, P. Leblanc, P. W. Jeffreys, I. Zacharov, E.J. Prebys, G. D. Lafferty, R. J. Homer, F. Odorici, A. M. Lee, J. von Krogh, R. J. Barlow, D. Axen, Horst Breuker, M. S. Dixit, M. J. Goodrick, I. Cohen, A. Jawahery, G. Tysarczyk-Niemeyer, Frans Meijers, Peter Sherwood, P. Ashton, Dave Robinson, C. Moisan, J. P. Walker, T. W. Pritchard, P. Teixeira-Dias, G. A. Snow, C. P. Ward, R. W. Springer, J. Ludwig, K. Runge, P. Bock, Michael Dittmar, G. Yekutieli, A. Astbury, A. A. Carter, W. R. Gibson, C. Y. Chang, D. Hochman, N. J. Thackray, C. Ho, C. Fukunaga, O. Ganel, R. Van Kooten, P. Taras, A. Beck, E. Heflin, O. Runolfsson, D. C. Imrie, A. J. Martin, Mitsuaki Nozaki, R. M. Brown, S. Schreiber, L. Lessard, G. J. Barker, Lorne Levinson, B. W. Kennedy, T. J. McMahon, R. K. Carnegie, H. Mes, N. Wermes, D. E. Klem, Claudio Grandi, G. P. Siroli, Ehud Duchovni, J. A. Wilson, I. P. Duerdoth, M. Fincke-Keeler, K. Riles, M. H. Lehto, T. J. Smith, W. Schappert, Paul Kyberd, F. K. Loebinger, J. L. Pinfold, K. Stephens, M. F. Turner, J. R. McNutt, M. W. Redmond, H. Ihssen, A. Rollnik, V. Gibson, John Baines, C. K. Hargrove, P. Schenk, A. D. Schaile, R. Sobie, C. J. Oram, M. Jimack, P. Mättig, D. R. Ward, John Allison, Kiyotomo Kawagoe, L. Janissen, S. W. Gensler, A. P. Wagner, T. Kobayashi, R. G. Kellogg, S. J. Pawley, V. H. Winterer, Gunter Quast, J. M. Roney, Stefano Marcellini, T. R. Wyatt, S. R. Hou, Claus Kleinwort, L. Köpke, Tohru Takeshita, J. Mildenberger, Harold Nguyen, J. Banks, Phillip Allport, G. Eckerlin, S. Weisz, R. D. Heuer, Georges Azuelos, Fabrizio Fabbri, D. Van den plas, K. W. Bell, Richard Keeler, Max Weber, Misao Sasaki, D. R. Rust, B. C. Shen, M. W. Moss, Gideon Alexander, W. G. Scott, P. Lennert, K. J. Anderson, P. M. Hattersley, R. Kowalewski, M. J. Losty, Claude Leroy, J. P. Pansart, O. Schaile, M. Hauschild, P. Paschievici, P R Poffenberger, C. Wahl, B. Nellen, C. P. Howarth, J. E. Pilcher, B. B. Brabson, J. Gascon, H. von der Schmitt, Marcello Mannelli, Andris Skuja, D. J. Miller, Tetsuro Mashimo, B. Poli, 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, N. I. Geddes, P. S. Wells, C. J. Virtue, H. M. Fischer, A. Michelini, S. A. Robins, T. Mouthuy, A. M. Rossi, T. Tsukamoto, S. Levegrün, M. Coupland, M. A. Whalley, Paolo Capiluppi, A. Buijs, and D. G. Fong
Subjects: Physics, Quark, Quantum chromodynamics, Nuclear and High Energy Physics, Top quark, Particle physics, High Energy Physics::Lattice, Astrophysics::High Energy Astrophysical Phenomena, Nuclear Theory, High Energy Physics::Phenomenology, Bottom quark, Photon structure function, Gluon, Nuclear physics, Quark star, High Energy Physics::Experiment, Particle Physics - Experiment, Lepton
Abstract: This is the post-print version of the Article - Copyright @ 1991 Elsevier. Quark and gluon jets in e+e− three-jet events at LEP are identified using lepton tagging of quark jets, through observation of semi-leptonic charm and bottom quark decays. Events with a symmetry under transposition of the energies and directions of a quark and gluon jet are selected: these quark and gluon jets have essentially the same energy and event environment and as a consequence their properties can be compared directly. The energy of the jets which are studied is about 24.5 GeV. In the cores of the jets, gluon jets are found to yield a softer particle energy spectrum than quark jets. Gluon jets are observed to be broader than quark jets, as seen from the shape of their particle momentum spectra both in and out of the three-jet event plane. The greater width of gluon jets relative to quark jets is also visible from the shapes of their multiplicity distributions. Little difference is observed, however, between the mean value of particle multiplicity for the two jet types. 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, The 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 Mati6re du Commissariat l'Energie Atomique, France, Bundesministerium for Forschung und Technologie, FRG, and the A.P. Sloan Foundation.
Published: 1991

27. The OPAL detector at LEP

Author: P. Igo-Kemenes, G. Maringer, H. Jeremie, N. K. Watson, G. J. VanDalen, P. Vande Vyvre, Eilam Gross, G. T. Zorn, R. E. Hughes-Jones, U. Maur, P. Farthouat, Horst Breuker, P von Walker, Y. Totsuka, R.M. Matson, B Cornet, D. Karlen, S Yamada, S. Zylberajch, R.J. Staley, J. R. Batley, J. Goldberg, P. S. Hinde, B. Nellen, M. Sproston, R. W. Springer, Andris Skuja, A. M. Rossi, J. Zimmer, K Ahmet, A. Buijs, H C Weber, D. M. Strom, M Lamblin, James M. Hill, E. Neuheimer, L. Godfrey, Tohru Takeshita, P. Routenburg, T. Tsukamoto, A. Dieckmann, M Fillion, Tetsuro Mashimo, H. M. Fischer, Sergo, A. Michelini, D Micolon, Tatsuo Kawamoto, O. Schaile, T. Behnke, P. Leblanc, H. Hartmann, I. P. Duerdoth, A Therond, S Jaroslawski, J. R. Carter, R. Yaari, B Gaillard-Grenadier, D. C. Colley, Georges Azuelos, M Marquet, A. Shapira, A. J.P. O'Dowd, E. Mauer, Shlomo Dado, J. M. Roney, E Poli, O. Ganel, N. Zwang, M. J. Goodrick, Joachim Heintze, I. Cohen, A. H. Ball, Aharon Levy, K. W. Bell, N. I. Geddes, H Gao, J. Banks, J. M. Lorah, M. Jimack, John Allison, W. Gorn, L. Mazzone, M. S. Dixit, D. Duchesneau, Frans Meijers, H Wenninger, P Rada, R. Rusniak, Makoto Minowa, W. Mohr, J. C. Hill, K. Riles, P. G. Murphy, S. Schreiber, Gibson, S. Weisz, R L Amstrong, G Canova, J.A. Lidbury, T. Zawistowski, John Hart, G.L. Giles, Gideon Bella, A Penton, T. Kobayashi, Stephen Lloyd, Fabrizio Fabbri, M. Jobes, J.L. Chevalley, M. W. Moss, D. Van den plas, M.M.B. Lasota, G. Duckeck, K. Stephens, M. Weymann, W. R. Gibson, Robert M Brown, R Losserand-Madoux, M. Uldry, P. M. Hattersley, G. Linser, B. C. Shen, John Hobbs, P. Scharff-Hansen, C. K. Hargrove, G. Mikenberg, J. D. Gillies, H. Matsumura, M Z Akraway, T. J. McMahon, R. G. Kellogg, M. Imori, R. Kolpin, D. J. Miller, O. W. Davies, L Baisin, Mark Oreglia, B. P. O'Neill, F.F. Heymann, H. J. Burckhart, J. E. Conboy, M. M. Deninno, M Morpurgo, Ehud Duchovni, W. J. Larson, D. Granite, B. Gandois, B G Duff, G.T.J. Arnison, H. Wang, J. W. Gary, L Briot, P Giudici, R Payne, U Seidler, Kiyotomo Kawagoe, N. C. Wood, R. A. Sansum, Stefano Marcellini, R. Kowalewski, Peter R Hobson, B. Parkinson, Y Gal, J. Waterhouse, W. J. Murray, Gunter Quast, A. M. Smith, C. M. Roach, C. M. Hawkes, A. P. Wagner, K H Souten, G Artusi, H. von der Schmitt, L. Denton, Kelby Anderson, S. Gross, M. J. Losty, F. X. Gentit, B. Lorazo, A Lefrancois, P Gorce, G. Bavaria, R. K. Carnegie, A L Fletcher, Masatoshi Koshiba, C. P. Ward, A Beer, D. J. White, G. Knop, L Biffoni, John Baines, B. J. Saunders, S. W. Gensler, M. Coupland, P Kobe, P. M. Watkins, D Lascols, J. Armitage, F Bourgeois, F Rochner, D. L. Rees, D Rybkowski, P.R. Goldey, M. Regimbald, Harold Nguyen, S. J. Hillier, K. Karner, C. J. Virtue, James Pinfold, B Vuillerme, I. Wingerter, F Pouyat, J. Gascon, T. P. Kokott, Rene Brun, J. A. Wilson, M.D. Jeffs, Chikara Fukunaga, H. J. Meyer, P. Wicht, D. C. Imrie, K Scheuring, M D Rousseau, K Miels, W.W. Miller, W. Glessing, R. P. Middleton, G Schmidlin, Phillip Allport, M. F. Turner, D. R. Ward, F L Desrosier, S. J. Pawley, Claus Kleinwort, L. Köpke, A. Weltin, G. N. Patrick, B. Wünsch, A. C. McPherson, Lorne Levinson, P E Estabrooks, G. P. Siroli, A. Simon, R. Bard, R J Shaw, George Lafferty, I. D'Antone, Norbert Wermes, M. Hansroul, Marcello Mannelli, C. N. P. Gee, Mitsuaki Nozaki, J. Ma, G. J. Barker, W M Evans, W. Schappert, A Eyting, F. K. Loebinger, C. Milstène, Otmar Biebel, J.F. Connolly, M. Couch, M Grossi, F. Lamarche, L. Lessard, M Mast, P. W. Jeffreys, M. Webel, J. Grunhaus, D. Joos, B. W. Kennedy, Britt Anderson, R. Cranfield, R. Humbert, P. Lennert, R. J. Homer, Allen Mincer, M. W. Redmond, J O Peterson, Peter Sherwood, James Pilcher, R Lorenzi, A Renoux, A. A. Macbeth, G. W. Wilson, Gideon Alexander, N. Lupu, Paolo Capiluppi, G Gagnon, A. Rollnik, K. Zankel, D M Sendall, Roger Barlow, D. Hochman, J. T.M. Chrin, M. Hauschild, F Verkerk, S. A. Wotton, R. Milborrow, R. J. Hemingway, P. Jovanovic, H. P. Borner, G Prodon, D. Menszner, Achim Müller, G. M. Dallavalle, P Keyberd, M. Beaulieu, F. S. Merritt, Alessandro Montanari, S. W. O'Neale, W N Stokes, C. Wahl, R Stephenson, H. Yamashita, S. Orito, John H. Schwarz, C. P. Howarth, M Lautscham, A Duperloup, A Charalambous, A. Possoz, H. Takeda, R. D. Heuer, M Cyvoct, F. G. Oakham, B Langset, T. W. Pritchard, L Marradi, D. E. Plane, C. Y. Chang, D. Hatzifotiadou, J. Raab, M. Shoa, O. Runolfsson, Alan Watson, F Massera, D. J.P. Dumas, R Shally, M Ferrari, Dave Charlton, R. W. L. Jones, P. Ashton, E. J. Spreadbury, P. Le Du, A. D. Schaile, H. Kreutzmann, P. Rapp, E. Jin, G. Giacomelli, H. Sanders, T. R. Wyatt, S. R. Hou, Michael Dittmar, G. Yekutieli, A. A. Carter, J.D. Colmer, J. Hagemann, J. Ludwig, T Goiffon, K. Runge, P. Bock, E. E. Elsen, H. Mes, P. Steinberg, J. Kroll, G. Crone, A Sato, M Guillot, H. M. Bosch, Wolfram Dietrich Zeuner, F. Beck, T. J. Smith, P. Mättig, I. J. Bloodworth, D. Voillat, Daniel Lellouch, S A Clark, S Tuffanelli, D. E. Klem, G Pozzo, J. G. Layter, P.S. Rozmarynowski, M Chamot, C. Beard, W. Seidl, R. G. Glasser, J. P. Martin, R. Hammarström, G. Tysarczyk, M. T. French, J. Thiebes, B. Holl, and H El-Mamouni
Subjects: Physics, Nuclear and High Energy Physics, Calorimeter (particle physics), Detector, Hadron, Solenoid, Tracking (particle physics), Nuclear physics, Lead glass, visual_art, visual_art.visual_art_medium, Detectors and Experimental Techniques, Instrumentation, Muon detector
Published: 1990

28. A direct search for new charged heavy-leptons at LEP

Author: S. Schreiber, T. J. McMahon, B. C. Shen, R. K. Carnegie, J. M. Lorah, Makoto Minowa, W. Mohr, Kiyotomo Kawagoe, J. A. Wilson, Masatoshi Koshiba, K. Stephens, F. Lamarche, R. J. Hemingway, Harold Nguyen, Mark Oreglia, D. J. Miller, P. Jovanovic, Austin Ball, F. S. Merritt, I. J. Bloddworth, D. Menszner, H. Yamashita, M. Z. Akrawy, Alessandro Montanari, A. Possoz, W. Schappert, C. J. Virtue, H. Takeda, A. P. Wagner, M. T. French, R. Kowalewski, J. M. Roney, C. M. Roach, R. Ströhmer, D. Strom, G. Knop, M. Coupland, J. D. Gillies, A. A. Macbeth, G. W. Wilson, M. Hauschild, G. T. Zorn, N. C. Wood, John Baines, A. Simon, R. J. Barlow, D. Granite, E. K. U. Gross, P. Igo-Kemenes, G. Maringer, H. Jeremie, M. Regimbald, O. Ganel, Wolfram Dietrich Zeuner, F. Beck, Otmar Biebel, R. W. L. Jones, M. Sproston, P. Routenburg, D. G. Charlton, Michael Dittmar, D. Karlen, R. E. Hughes-Jones, U. Maur, Achim Müller, J. Ma, D. R. Ward, G. Yekutieli, K. Riles, F. K. Loebinger, A. Dieckmann, M. Couch, Phillip Allport, F. G. Oakham, P. Le Du, D. Duchesneau, M. M.B. Lasota, O. W. Davies, J. Grunhaus, P. A. Elcombe, S. Wotton, H. Kreutzmann, A. A. Carter, D. E. Plane, Stephen Hillier, E. Jin, A. Michellini, C. Milstene, P. W. Jeffreys, T. J. Smith, B. Holl, G. Giacomelli, J. C. Armitage, A. M. Rossi, M. W. Redmond, D. L. Rees, R. Yaari, J. T.M. Chrin, H. Mes, Gideon Bella, P. Mättig, T. Tsukamoto, H. J. Burckhart, B. Wuensch, G. J. VanDalen, Jacqueline Batley, H. Hagedorn, A. C. McPherson, S. Bethke, Marco Cuffiani, A. Shapira, H. El Mamouni, Tohru Takeshita, A. Rollnik, P. Farthouat, Horst Breuker, Christoph Geich-Gimbel, C. M. Hawkes, Daniel Lellouch, G.T.J. Arnison, J. Goldberg, A. Buijs, T. Kawamoto, Takehiko Mori, S. Zylberajch, Gideon Alexander, P. S. Hinde, G. A. Snow, C. P. Ward, D. Hochman, Norbert Wermes, Alan Watson, D. J.P. Dumas, M. M. Deninno, J. Kroll, P. Kyberd, Paolo Capiluppi, H. E. Stier, M. W. Moss, A. Jawahery, I. P. Duerdoth, F. Odorici, M. Weymann, Georges Azuelos, S. Orito, C. Wahl, C. P. Howarth, P. G. Estabrooks, F. X. Gentit, G. Bavaria, P. M. Hattersley, H. Wang, W. R. Gibson, J. E. Pilcher, Peter Sherwood, R. W. Springer, John H. Schwarz, Gunter Quast, N. K. Watson, K. W. Bell, J. E. Conboy, C. K. Hargrove, C. Ho, N. I. Geddes, M. Ogg, J. Ludwig, K. Runge, P. Bock, H. Oh, Ehud Duchovni, P. M. Watkins, John Allison, Max Weber, M. Hansroul, E. Heflin, D. C. Imrie, Misao Sasaki, G. M. Dallavalle, Shlomo Dado, J. D. Hobbs, R. M. Brown, Lorne Levinson, R. A. Sansum, G. P. Siroli, B. Nellen, B. Poli, B. W. Kennedy, P. G. Murphy, O. Runolfsson, K. J. Anderson, A. Pouladdej, J. von Krogh, I. Wingerter, Giora Mikenberg, L. Lessard, S. W. Gensler, R. G. Kellogg, J. R. Carter, J. Raab, G. N. Patrick, B. Gandois, M. Imori, R. J. Homer, P. Leblanc, T. Kobayashi, S. W. O'Neale, S. J. Pawley, Peter R Hobson, O. Schaile, H. M. Fischer, J. Waterhouse, A. J.P. O'Dowd, P. Ashton, Stefano Marcellini, Claus Kleinwort, L. Köpke, M. J. Losty, T. P. Kokott, Rene Brun, J. Steuerer, J. Hart, C. Y. Chang, Mitsuaki Nozaki, J. Banks, Y. Yang, S. Weisz, R. D. Heuer, Fabrizio Fabbri, M. J. Goodrick, Joachim Heintze, D. Van den plas, Stephen Lloyd, I. Cohen, D. E. Klem, P. Lennert, M. F. Turner, W. J. Murray, B. P. O'Neill, J. Hagemann, Erez Etzion, B. J. Saunders, Gareth J. Barker, R. P. Middleton, M. S. Dixit, Despina Hatzifotiadou, D. G. Fong, G. D. Lafferty, H. von der Schmitt, T. W. Pritchard, F. Roehner, Marcello Mannelli, C. N. P. Gee, Andris Skuja, C. Fukunaga, Tetsuro Mashimo, Frans Meijers, M. Jimack, W. Gorn, J. P. Martin, J. L. Pinfold, John Hill, M. Jobes, E. J. Spreadbury, A. D. Schaile, P. Scharff-Hansen, W. J. Larson, P. Grosse-Wiesmann, J. W. Gary, A. M. Smith, V. H. Winterer, B. Lorazo, T. R. Wyatt, S. R. Hou, G. Tysarczyk, J. G. Layter, and S. Sanghera
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Missing energy, Annihilation, Electron–positron annihilation, High Energy Physics::Phenomenology, Resonance (particle physics), Momentum, Nuclear physics, Massless particle, High Energy Physics::Experiment, Neutrino, Particle Physics - Experiment, Lepton
Abstract: This is the post-print version of the Article - Copyright @ 1990 Elsevier Results are presented from a search for a new charged heavy lepton in e+e− annihilation. The data were taken with the OPAL detector at LEP during a scan of the Z0 resonance. Two independent search techniques were used, one looking for events with large missing energy and missing momentum transverse to the beam, and the other for events with isolated energetic leptons. Two candidate events, consistent with expected background, were found in the first search; none was found in the second. These results allow the exclusion at the 95% confidence level of a charged heavy lepton of mass less than 44.3 GeV/c2 if it is assumed to have a massless neutrino partner. Limits are also presented for the case of a massive neutrino. This study is supported by The Bundesministerium f'tir Forschung und Technologie, FRG, The Department of Energy, USA, The Institut de Recherche Fondamentale du Commissariat a l'Energie Atomique, The Israeli Ministry of Science, The Minerva Gesellschaft, The National Science Foundation, USA, The Natural Sciences and Engineering Research Council, Canada, The Japanese Ministry of Education, Science and Culture (the Monbusho) and a grant under the Monbusho International Science Research Program, The Science and Engineering Research Council, UK and The A.P. Sloan Foundation.
Published: 1990

29. Mass limits for a standard model Higgs boson in e+e- collisions at LEP

Author: H. Wang, D. E. Plane, V. H. Winterer, Stephen Hillier, Gunter Quast, Kiyotomo Kawagoe, D. Hochman, D. Duchesneau, C. Wahl, A. P. Wagner, H. M. Fischer, Alan Watson, D. J.P. Dumas, M. J. Losty, Masatoshi Koshiba, R. W. L. Jones, M. T. French, J. M. Roney, G.T.J. Arnison, B. Holl, A. Michelini, G. Knop, T. J. Smith, P. Igo-Kemenes, P. Le Du, H. Kreutzmann, Harold Nguyen, A. Jawahery, G. Maringer, J. Steuerer, H. Jeremie, H. Yamashita, P. A. Elcombe, P. Farthouat, Horst Breuker, E. Jin, G. Giacomelli, P. Mättig, H. Oh, R. E. Hughes-Jones, U. Maur, B. Wuensch, Peter Sherwood, H. Hagedorn, Frans Meijers, S. Zylberajch, P. S. Hinde, P. W. Jeffreys, P. G. Estabrooks, I. J. Bloodworth, R. W. Springer, Gideon Bella, W. R. Gibson, C. Ho, H. J. Burckhart, Jacqueline Batley, H. Mes, John Allison, A. Possoz, H. Takeda, E. Heflin, Phillip Allport, R. M. Brown, Lorne Levinson, C. Y. Chang, P. Bock, M. M.B. Lasota, C. Fukunaga, O. W. Davies, N. K. Watson, H. El Mamouni, Tohru Takeshita, Shlomo Dado, D. L. Rees, B. W. Kennedy, M. J. Oreglia, D. Granite, D. Karlen, M. W. Moss, C. Milstene, O. Ganel, P. M. Watkins, P. G. Murphy, C. M. Hawkes, Daniel Lellouch, Mitsuaki Nozaki, A. C. McPherson, Takehiko Mori, R. G. Kellogg, P. M. Hattersley, R. Ströhmer, M. Jimack, Erez Etzion, G. M. Dallavalle, B. J. Saunders, K. Riles, I. P. Duerdoth, Georges Azuelos, D. Strom, Gareth J. Barker, F. Lamarche, G. T. Zorn, Giora Mikenberg, G. J. VanDalen, J. Schwarz, A. Shapira, F. Odorici, J. R. Carter, G. N. Patrick, A. Simon, Stefano Marcellini, Otmar Biebel, Wolfram Dietrich Zeuner, K. Runge, R. J. Hemingway, F. Beck, N. I. Geddes, K. W. Bell, Colin Roach, J. D. Hobbs, I. Wingerter, D. G. Charlton, D. C. Imrie, F. Roehner, M. Couch, G. P. Siroli, P. Jovanovic, Misao Sasaki, G. A. Snow, C. P. Ward, J. Ma, F. K. Loebinger, J. L. Pinfold, E. J. Spreadbury, B. C. Shen, Norbert Wermes, J. T.M. Chrin, M. W. Redmond, Austin Ball, D. Menszner, T. Kawamoto, P. Grosse-Wiesmann, O. Runolfsson, K. Stephens, B. Poli, A. Rollnik, L. Lessard, R. Yaari, John Baines, O. Schaile, M. Regimbald, R. P. Middleton, H. E. Stier, D. R. Ward, M. Z. Akrawy, Alessandro Montanari, E. K. U. Gross, S. Orito, S. Bethke, Marco Cuffiani, M. Sproston, R. Kowalewski, J. Goldberg, T. R. Wyatt, P. Routenburg, A. Dieckmann, S. R. Hou, B. Nellen, Gideon Alexander, M. S. Dixit, S. Wotton, J. D. Gillies, P. Leblanc, Despina Hatzifotiadou, P. Kyberd, Paolo Capiluppi, G. D. Lafferty, N. C. Wood, K. J. Anderson, A. D. Schaile, J. M. Lorah, T. W. Pritchard, R. J. Barlow, Makoto Minowa, D. J. Miller, D. E. Klem, A. M. Rossi, J. Ludwig, T. Tsukamoto, M. J. Goodrick, Joachim Heintze, I. Cohen, M. F. Turner, C. K. Hargrove, W. J. Murray, Ehud Duchovni, B. P. O'Neill, R. A. Sansum, J. Hagemann, S. W. Gensler, T. Kobayashi, J. Hart, W. Mohr, Y. Yang, C. J. Virtue, M. Hansroul, M. Coupland, Stephen Lloyd, R. J. Homer, Christoph Geich-Gimbel, B. Gandois, M. M. Deninno, J. Kroll, F. X. Gentit, G. Bavaria, J. E. Conboy, M. Ogg, F. G. Oakham, A. Pouladdej, J. Banks, S. Schreiber, F. S. Merritt, T. J. McMahon, J. C. Armitage, A. J.P. O'Dowd, R. K. Carnegie, S. Weisz, D. G. Fong, R. D. Heuer, J. G. Layter, M. S. Weber, J. A. Wilson, Fabrizio Fabbri, S. Sanghera, J. P. Martin, D. Van den plas, John Hill, G. Tysarczyk, A. Buijs, H. von der Schmitt, W. Schappert, J. von Krogh, P. Lennert, J. Raab, Marcello Mannelli, C. N. P. Gee, P. Ashton, M. Jobes, T. P. Kokott, Rene Brun, P. Scharff-Hansen, C. P. Howarth, W. J. Larson, Michael Dittmar, G. Yekutieli, J. E. Pilcher, J. W. Gary, J. Grunhaus, A. A. Carter, A. A. Macbeth, G. W. Wilson, A. M. Smith, M. Hauschild, B. Lorazo, M. Weymann, Andris Skuja, Tetsuro Mashimo, S. J. Pawley, M. Imori, Claus Kleinwort, L. Köpke, S. W. O'Neale, Achim Müller, Peter R Hobson, J. Waterhouse, and W. Gorn
Subjects: Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, High Energy Physics::Phenomenology, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment, Standard Model
Abstract: A search for the minimal standard model Higgs boson has been performed with data from e+e− collisions in the OPAL detector at LEP. The analysis is based on 825 nb−1 of data taken at centre-of-mass energies between 88.3 and 95.0 GeV. The search concentrated on the reactions e + e − →(e + e − or μ + μ − or v v )H 0 ,H 0 →( q q or τ + τ − ) , for Higgs masses above 3 GeV/c2. No Higgs boson candidates have been observed. The present study excludes the existence of a standard model H0 with mass in the range 3.0⩽mH⩽19.3 GeV/c2 at the 95% confidence level.
Published: 1989

30. A search for acoplanar pairs of leptons or jets in Z0 decays: mass limits on supersymmetric particles

Author: Gunter Quast, J. P. Martin, A. Buijs, D. G. Fong, O. Schaile, H. von der Schmitt, Gideon Bella, H. J. Burckhart, M. T. French, Jacqueline Batley, Michael Dittmar, G. Yekutieli, J. Steuerer, G. Tysarczyk, F. Roehner, Marcello Mannelli, C. N. P. Gee, G.T.J. Arnison, D. Hochman, Kiyotomo Kawagoe, P. Igo-Kemenes, K. J. Anderson, H. E. Stier, P. G. Estabrooks, A. A. Carter, N. K. Watson, P. M. Watkins, G. Maringer, B. C. Shen, O. Ganel, J. Hart, A. P. Wagner, Christoph Geich-Gimbel, S. Wotton, K. Stephens, Y. Yang, H. Jeremie, A. Simon, Andris Skuja, C. M. Roach, J. G. Layter, I. Wingerter, R. E. Hughes-Jones, U. Maur, J. M. Roney, K. Riles, Otmar Biebel, D. G. Charlton, C. J. Virtue, M. M. Deninno, Tetsuro Mashimo, C. M. Hawkes, M. M.B. Lasota, C. Y. Chang, Stephen Lloyd, O. W. Davies, M. Couch, Ana Beatriz Alvarez Perez, S. Sanghera, Terry Richard Wyatt, S. J. Pawley, J. Kroll, G. Knop, M. Coupland, R. Kowalewski, Claus Kleinwort, L. Köpke, Mitsuaki Nozaki, C. Milstene, H. Hagedorn, W. Gorn, J. D. Hobbs, C. Wahl, John Baines, M. Regimbald, B. Holl, Daniel Lellouch, Phillip Allport, G. Bavaria, C. P. Howarth, J. E. Conboy, M. Ogg, A. C. McPherson, A. Jawahery, J. T.M. Chrin, G. Giacomelli, J. E. Pilcher, M. Jobes, J. C. Armitage, F. Lamarche, F. X. Gentit, P. Scharff-Hansen, D. R. Ward, P. Lennert, R. J. Hemingway, F. G. Oakham, Shlomo Dado, F. Odorici, A. A. Macbeth, M. Imori, A. Pouladdej, W. J. Larson, D. E. Klem, D. E. Plane, G. W. Wilson, M. Hauschild, Takehiko Mori, J. W. Gary, J. von Krogh, J. Raab, Horst Breuker, P. Farthouat, Peter Sherwood, T. Kawamoto, R. W. Springer, S. W. O'Neale, D. C. Imrie, Stephen Hillier, R. W. L. Jones, F. S. Merritt, S. Orito, John H. Schwarz, Frans Meijers, E. J. Spreadbury, H. Oh, M. F. Turner, J. Ludwig, A. M. Smith, B. Lorazo, P. Ashton, P. Le Du, Achim Müller, Peter R Hobson, J. Waterhouse, G. P. Siroli, G. M. Dallavalle, A. D. Schaile, A. J.P. O'Dowd, Gideon Alexander, P. Kyberd, N. Lupu, Paolo Capiluppi, John Allison, P. Jovanovic, Austin Ball, D. Menszner, H. Kreutzmann, P. S. Hinde, K. Runge, P. Bock, J. Grunhaus, C. K. Hargrove, Ehud Duchovni, D. J.P. Dumas, E. Jin, Erez Etzion, H. El Mamouni, M. J. Oreglia, M. Z. Akrawy, Alessandro Montanari, Tohru Takeshita, W. J. Murray, P. G. Murphy, B. J. Saunders, Giora Mikenberg, R. A. Sansum, P. Grosse-Wiesmann, S. W. Gensler, J. D. Gillies, I. P. Duerdoth, J. R. Carter, Georges Azuelos, S. Schreiber, T. J. McMahon, Gareth J. Barker, T. Kobayashi, A. T. Watson, V. H. Winterer, J. Banks, G. N. Patrick, K. W. Bell, M. W. Moss, M. Weymann, P. M. Hattersley, N. C. Wood, R. K. Carnegie, Max Weber, S. Weisz, T. P. Kokott, Rene Brun, R. D. Heuer, J. C. Hill, Misao Sasaki, R. Ströhmer, O. Runolfsson, R. J. Barlow, D. J. Miller, S. R. Hou, J. A. Wilson, Fabrizio Fabbri, D. Van den plas, G. A. Snow, R. G. Kellogg, D. Strom, G. T. Zorn, C. P. Ward, Norbert Wermes, D. Duchesneau, W. Schappert, L. Lessard, M. Hansroul, M. S. Dixit, Despina Hatzifotiadou, B. Gandois, Wolfram Dietrich Zeuner, F. Beck, G. D. Lafferty, W. R. Gibson, Stefano Marcellini, H. Yamashita, C. Ho, R. J. Homer, T. J. Smith, T. W. Pritchard, E. Heflin, P. Mättig, A. Possoz, B. Wuensch, R. M. Brown, Lorne Levinson, I. J. Bloodworth, H. Takeda, B. W. Kennedy, P. W. Jeffreys, J. Ma, F. K. Loebinger, H. Mes, R. P. Middleton, C. Fukunaga, M. W. Redmond, D. Karlen, M. Jimack, A. Rollnik, J. L. Pinfold, Masatoshi Koshiba, Harold Nguyen, A. M. Rossi, T. Tsukamoto, B. P. O'Neill, N. I. Geddes, B. Poli, H. M. Fischer, M. J. Losty, A. Michelini, J. Hagemann, P. A. Elcombe, D. L. Rees, G. J. VanDalen, J. Goldberg, B. Nellen, P. Leblanc, J. M. Lorah, Makoto Minowa, W. Mohr, M. J. Goodrick, Joachim Heintze, I. Cohen, E. K. U. Gross, M. Sproston, P. Routenburg, A. Dieckmann, S. Zylberajch, R. Yaari, S. Bethke, Marco Cuffiani, A. Shapira, D. Granite, and H. Wang
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Chargino, Electron–positron annihilation, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Particle Physics - Experiment, Lepton
Abstract: We have searched for Z 0 decays into acoplanar pairs of leptons or jets. The data were recorded with the OPAL detector during an energy scan around the Z 0 peak and correspond to about 17000 produced Z 0, s. We have determined model independent limits on branching ratios for the Z 0 to decay into pairs of heavy particles with subsequent decays leading to the above topologies. In the context of supersymmetric models, mass bounds close to the kinematic limit were obtained for the scalar leptons, ẽ, gm, gt, and for the chargino, X ± .
Published: 1989

31. A search for the top and b' quarks in hadronic Z0 decays

Author: J. D. Hobbs, G. Giacomelli, Frans Meijers, J. G. Layter, Ana Beatriz Alvarez Perez, S. Sanghera, M. T. French, C. Beard, A. J.P. O'Dowd, A. T. Watson, J. Hart, J. P. Martin, G. Tysarczyk, A. Shapira, P. Igo-Kemenes, G. Maringer, H. Jeremie, B. Holl, F. Lamarche, R. J. Hemingway, Christoph Geich-Gimbel, Kiyotomo Kawagoe, I. J. Bloodworth, C. Fukunaga, H. Oh, R. E. Hughes-Jones, U. Maur, H. M. Fischer, Gideon Bella, J. Banks, G.T.J. Arnison, M. M. Deninno, M. J. Losty, A. P. Wagner, D. E. Klem, Jacqueline Batley, J. Ma, T. P. Kokott, Rene Brun, P. Jovanovic, S. Weisz, Austin Ball, E. K. U. Gross, R. D. Heuer, Fabrizio Fabbri, D. G. Fong, D. Menszner, J. Kroll, M. Jimack, M. M.B. Lasota, B. J. Saunders, H. E. Stier, D. Van den plas, J. M. Roney, M. Sproston, F. X. Gentit, H. von der Schmitt, Gareth J. Barker, A. Michelini, M. Z. Akrawy, Alessandro Montanari, O. W. Davies, A. Jawahery, G. Bavaria, J. E. Conboy, M. Ogg, F. K. Loebinger, P. Routenburg, G. Knop, H. El Mamouni, M. J. Oreglia, C. Milstene, H. Hagedorn, A. C. McPherson, A. Dieckmann, Y. Yang, J. D. Gillies, A. Pouladdej, Tohru Takeshita, N. C. Wood, P. A. Elcombe, J. L. Pinfold, F. Odorici, P. G. Estabrooks, P. Lennert, C. M. Roach, M. F. Turner, R. J. Barlow, M. W. Redmond, F. S. Merritt, D. J. Miller, J. R. Carter, G. N. Patrick, M. S. Dixit, Peter Sherwood, J. Grunhaus, A. Simon, D. Hochman, Otmar Biebel, Despina Hatzifotiadou, D. G. Charlton, F. Roehner, D. L. Rees, G. D. Lafferty, A. Rollnik, I. P. Duerdoth, Marcello Mannelli, K. Stephens, M. Couch, R. W. Springer, C. N. P. Gee, H. Yamashita, G. A. Snow, C. P. Ward, N. K. Watson, Georges Azuelos, M. Jobes, D. Karlen, G. J. VanDalen, W. J. Murray, R. W. L. Jones, J. Ludwig, A. Possoz, J. C. Armitage, C. M. Hawkes, T. W. Pritchard, Stephen Lloyd, H. Takeda, P. Farthouat, Daniel Lellouch, P. M. Watkins, P. Le Du, K. Runge, P. Bock, H. Kreutzmann, P. Scharff-Hansen, Horst Breuker, W. J. Larson, D. Granite, J. T.M. Chrin, Takehiko Mori, K. W. Bell, Masatoshi Koshiba, S. J. Pawley, E. Jin, R. P. Middleton, John Baines, S. Zylberajch, Claus Kleinwort, L. Köpke, Max Weber, J. W. Gary, M. Imori, P. S. Hinde, E. J. Spreadbury, M. Regimbald, Harold Nguyen, T. Kawamoto, J. C. Hill, A. D. Schaile, S. W. O'Neale, W. R. Gibson, C. Y. Chang, M. Hansroul, Peter R Hobson, A. M. Smith, N. I. Geddes, J. Waterhouse, Misao Sasaki, P. Grosse-Wiesmann, C. Ho, B. C. Shen, R. Ströhmer, I. Wingerter, M. W. Moss, D. R. Ward, J. M. Lorah, N. Wermes, M. Weymann, D. Duchesneau, V. H. Winterer, P. W. Jeffreys, B. Lorazo, Mitsuaki Nozaki, P. M. Hattersley, D. Strom, S. Orito, John H. Schwarz, H. Wang, Makoto Minowa, H. Mes, B. P. O'Neill, W. Mohr, Andris Skuja, G. T. Zorn, Shlomo Dado, S. R. Hou, C. K. Hargrove, Ehud Duchovni, R. J. Homer, E. Heflin, T. J. Smith, Gunter Quast, R. M. Brown, Wolfram Dietrich Zeuner, J. Hagemann, Tetsuro Mashimo, John Allison, D. C. Imrie, P. Mättig, R. Kowalewski, Lorne Levinson, F. Beck, G. M. Dallavalle, P. G. Murphy, R. Yaari, B. Wuensch, B. Poli, S. Bethke, W. Gorn, B. W. Kennedy, Marco Cuffiani, Giora Mikenberg, R. A. Sansum, G. P. Siroli, R. G. Kellogg, J. Goldberg, Stefano Marcellini, D. E. Plane, B. Nellen, O. Ganel, Stephen Hillier, H. Boerner, P. Leblanc, K. Riles, D. J.P. Dumas, A. M. Rossi, T. Tsukamoto, S. W. Gensler, B. Gandois, M. J. Goodrick, Joachim Heintze, I. Cohen, T. Kobayashi, F. G. Oakham, H. J. Burchart, Phillip Allport, O. Schaile, O. Runolfsson, Gideon Alexander, P. Kyberd, N. Lupu, Paolo Capiluppi, A. Buijs, A. A. Macbeth, G. W. Wilson, M. Hauschild, C. J. Virtue, Terry Richard Wyatt, M. Coupland, Achim Müller, C. Wahl, C. P. Howarth, J. E. Pilcher, Michael Dittmar, G. Yekutieli, A. A. Carter, L. Lessard, S. Schreiber, T. J. McMahon, R. K. Carnegie, S. Wotton, J. A. Wilson, W. Schappert, J. von Krogh, J. Raab, P. Ashton, and K. J. Anderson
Subjects: Physics, Nuclear and High Energy Physics, Top quark, Particle physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, Down quark, Top quark condensate, Omega baryon, Bottom quark, Sigma baryon, Nuclear physics, Quark star, Up quark, High Energy Physics::Experiment, Particle Physics - Experiment
Abstract: We report on a search for new quarks in hadronic Z° decays. From the event shape analysis of a data sample containing 2185 multihadronic annihilation events, we observe no evidence for the top or b' quarks. We derive limits for the top and b' quark masses under the assumption of various possible standard model and non-standard model decay schemes. Our search is sensitive to quark masses larger than 23 GeV/c2; it yields the following lower limits at a 95% confidence level: 44.5 GeV/c2 for the top quark mass and 45.2 GeV/c2 for the b′ quark mass.
Published: 1989

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31 results on '"S. J. Pawley"'

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

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

3. The detector simulation program for the OPAL experiment at LEP

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

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

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

7. The trigger system of the OPAL experiment at LEP

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

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

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

11. The diamond shaped cathode pads of the OPAL muon barrel drift chambers

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

13. A search for scalar leptoquarks in Z0 decays

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

15. A study of - in Z0 decays

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

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

18. The OPAL muon barrel detector

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

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

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

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

23. Observation of $J/\psi$ production in multihadronic $Z^{0}$ decays

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

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

26. A direct observation of quark-gluon jet differences at LEP

27. The OPAL detector at LEP

28. A direct search for new charged heavy-leptons at LEP

29. Mass limits for a standard model Higgs boson in e+e- collisions at LEP

30. A search for acoplanar pairs of leptons or jets in Z0 decays: mass limits on supersymmetric particles

31. A search for the top and b' quarks in hadronic Z0 decays

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31 results on '"S. J. Pawley"'

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