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

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

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

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

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

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

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

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

105. The data acquisition system of the OPAL detector at LEP

Author: P. Farthouat, R. P. Middleton, P. Scharff-Hansen, W. Gorn, M. Jimack, R. E. Hughes-Jones, F. X. Gentit, N. I. Geddes, P. S. Wells, N. K. Watson, T. Tsukamoto, A. J. Martin, G. P. Siroli, Berry Holl, S. Wotton, Randall Sobie, F. Lamarche, R. Humbert, P. Schenk, Claus Kleinwort, B. P. O'Neill, John Hart, O. Schaile, Alessandro Montanari, R. W. L. Jones, C. Fukunaga, J. P. Martin, John Hill, P. Le Du, H. von der Schmitt, H. J. Burckhart, R. Shypit, P.A. Elcombe, C. N. P. Gee, Lorne Levinson, Frans Meijers, G. Quast, John Baines, Stephen Hillier, Alan Watson, G. Crone, D. Strom, Wolfram Dietrich Zeuner, F. Beck, D. G. Charlton, R. Cranfield, Peter Sherwood, R. W. Springer, Daniel Lellouch, J. Raab, Dave Robinson, and T. J. Smith
Subjects: Physics, Nuclear and High Energy Physics, Modularity (networks), Workstation, business.industry, Local area network, Minicomputer, law.invention, Software, Data acquisition, law, Detectors and Experimental Techniques, business, Instrumentation, Computer hardware, Event reconstruction, VMEbus
Abstract: This report describes the 1991 implementation of the data acquisition system of the OPAL detector at LEP including the additional services and infrastructure necessary for its correct and reliable operation. The various tasks in this “on-line” environment are distributed amongst many VME subsystems, workstations and minicomputers which communicate over general purpose local area networks and special purpose buses. The tasks include data acquisition, control, monitoring, calibration and event reconstruction. The modularity of both hardware and software facilitates the upgrading of the system to meet new requirements.
Published: 1993

106. The OPAL silicon microvertex detector

Author: R. Shaw, Jacqueline Batley, A. J. Martin, M. Uldry, R. Humbert, John Hobbs, X. C. Lou, U. C. Dunwoody, P. Singh, C. Leroy, W. Gorn, A. A. Carter, Paul Seller, J. C. Hill, P.R. Goldey, Phillip Allport, Paolo Capiluppi, O. Runolfsson, D. Voillat, C. J. Oram, J. R. Carter, M. J. Goodrick, J. P. Martin, C. Moisan, John Hill, S. De Jong, M. F. Turner, R. Hammarström, G. G. Hanson, W. Glessing, F. R. Jacob, Paul Kyberd, V. Gibson, D. R. Ward, K. H. Wolf, T. W. Pritchard, and M. Jiminez
Subjects: Physics, Nuclear and High Energy Physics, Silicon, business.industry, Detector, chemistry.chemical_element, Integrated circuit, Semiconductor device, Particle detector, law.invention, Semiconductor detector, Nuclear physics, chemistry, law, Microelectronics, Optoelectronics, Collider, business, Instrumentation
Abstract: A silicon strip microvertex detector has been designed, constructed and commissioned in the OPAL experiment at the LEP electron-positron collider. The microstrip devices incorporate a new FoxFET biassing scheme developed together with Micron Semiconductor Ltd., UK. The devices digitise with a precision close to 5 μm and have an exceptionally high signal-to-noise ratio. The associated microelectronics were all custom made for the OPAL project. The detector began operation in 1991 and has since continued to be part of the OPAL experiment, performing to a very high standard and opening up new areas of physics studies.
Published: 1993

107. Inclusive neutral vector meson production in hadronicZ 0 decays

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

108. 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

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

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

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

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

111. 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

112. 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

113. 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

114. 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

115. 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

116. 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

117. 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

118. 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

119. 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

120. 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

121. 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

122. The response of an aluminum-scintillator calorimeter to electrons near the critical energy from 50 to 150 MeV and comparisons with the EGS4 program predictions

Author: C. P. Leavitt, T. J. Bowles, J. Kang, L. B. Auerbach, W. Gorn, B. D. Dieterle, T. Dombeck, D. D. Koetke, Scott H. Clearwater, and H. S. Matis
Subjects: Physics, Nuclear and High Energy Physics, Physics::Instrumentation and Detectors, chemistry.chemical_element, Penetration (firestop), Electron, Scintillator, Nuclear physics, chemistry, Aluminium, Critical energy, High Energy Physics::Experiment, Penetration depth, Instrumentation
Abstract: We measured electron shower transport through a finely granulated calorimeter composed of alternating layers of aluminum and plastic scintillator for electron energies of 53, 108 and 144 MeV. These data were in the transition region near to the critical energies for both aluminum and carbon. Previous measurements in this region suggested deviations from the predicted calorimeter energy resolution; however, our data were in agreement with resolutions calculated using the EGS4 computer program. We made detailed measurements of the penetration depth of electrons and their electromagnetic showers into the calorimeter, as well as the size of gaps where the energy was transported by neutral particles. These measurements were also found to be in general agreement with the EGS4 predictions. However, there was one significant discrepancy, the data showed significantly deeper shower penetration into the calorimeter than predicted by the program.
Published: 1990

123. 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

124. Inclusive production of $D^{*\pm}$ mesons in photon-photon collisions at $\sqrt{s}_{ee}$= 183 and 189 GeV and a first measurement of $F^{\gamma}_{2,c}$

Author: H. Mes, I. P. Duerdoth, S. Braibant, T. R. Junk, P. S. Wells, G. Mikenberg, P. Hüntemeyer, Terry Richard Wyatt, A. T. Watson, Ekg Sarkisyan, T. Kobayashi, P. Igo-Kemenes, Ehud Duchovni, K. Ishii, T. Behnke, H. Jeremie, T. Kuhl, N. K. Watson, Richard Nisius, Matthias Schröder, M. Jimack, O. Schaile, B. List, Erez Etzion, M. Thiergen, A. Michelini, F. Wäckerle, D. M. Gingrich, R. G. Kellogg, Marco Cuffiani, P. E.L. Clarke, G. Gaycken, P. G. Bright-Thomas, Dave Charlton, Shlomit Tarem, J. P. Martin, I. J. Bloodworth, D. Lanske, Stefano Marcellini, C. Y. Chang, A. Macpherson, M. Schumacher, A. M. Rossi, J. Lauber, B. Surrow, P. Taras, Yoram Rozen, P. I. Kayal, S. A. Robins, P. F. Åkesson, F. Odorici, Paul Kyberd, F. K. Loebinger, Ivor Fleck, H. Rick, Achim Stahl, Naoko Kanaya, R. L. Coxe, R. J. Sobie, R. Liebisch, Joleen Pater, A. Klier, R. D. Heuer, A. J. Martin, S. Baumann, Norbert Wermes, A. Hocker, K. Ackerstaff, D. R. Rust, K. Hoffman, Junichi Kanzaki, S. D. Talbot, H. A. Neal, Sherry Towers, Klaus Desch, J. Polok, T. Kawamoto, D. Karlen, Raimund Ströhmer, R. Howard, Thorsten Wengler, A. D. Schaile, D. Chrisman, G. D. Long, Gideon Bella, J. A. McKenna, O. Runolfsson, Gabriella Pasztor, P. Vannerem, P. Scharff-Hansen, M. Fanti, S. Orito, A. Biguzzi, E. A. Mckigney, J. Couchman, W. Mader, S. Betts, A. K. Honma, H. Voss, M. Hapke, J. G. Layter, W. M. Sang, C. K. Hargrove, C. H. Shepherd-Themistocleous, J. Grunhaus, Robert McPherson, K. Graham, G. A. Snow, C. P. Ward, Claudio Grandi, T. Barillari, Tara Shears, H. J. Burckhart, Jacqueline Batley, Stefan Schmitt, Fabrizio Fabbri, Richard Teuscher, Claudia Ciocca, A. Frey, S. Söldner-Rembold, W.J. McDonald, Beatrix Dienes, S. Rosati, D. J. Miller, M. J. Oreglia, O. C. Cooke, A. A. Faust, F. Fiedler, P. Pfeifenschneider, Shoji Asai, G. D. Lafferty, D. I. Futyan, R. Kowalewski, J. R. Carter, F. R. Jacob, S.J. Dallison, J. Letts, S. Arcelli, A. M. Smith, J. Goldberg, P. Gagnon, A. Harel, J. Patt, André Schöning, L. Brigliadori, O. Sahr, Ikuo Ueda, D. M. Strom, J. Allison, G. N. Patrick, Daniel Lellouch, J. Lu, Takehiko Mori, S. Spagnolo, A. W. Lloyd, G. Giacomelli, A. Okpara, R. Hawkings, C. R. Jones, Juergen Thomas, P. Mättig, I. Lawson, Gideon Alexander, Satoshi Mihara, K. Sachs, A. De Roeck, M. Kobel, Paolo Capiluppi, Shlomo Dado, P. G. Estabrooks, R. K. Keeler, Zoltan Laszlo Trocsanyi, Sachio Komamiya, R VanKooten, C. Sbarra, S. W. O'Neale, G. W. Wilson, M. Hauschild, M. S. Dixit, Frans Meijers, H. Landsman, Dong Hee Kim, Michael Hildreth, Alain Bellerive, I. Cohen, R. J. Barlow, Christoph Rembser, M. Verzocchi, Arnulf Quadt, James Pinfold, R. Perez-Ochoa, R. Seuster, Paolo Giacomelli, M. Hansroul, N. L. Rodning, P. Dervan, M. Fierro, P. M. Watkins, M. Kolrep, B. Poli, F. G. Oakham, K. J. Anderson, T. P. Kokott, D. Waller, S. F. Ashby, M. Harin-Dirac, E. L. Barberio, R. J. Homer, K. Stephens, V. Zacek, T. Saeki, Marcello Mannelli, C. Littlewood, R. J. Hemingway, K. Stoll, Andris Skuja, J. Lillich, D. Axen, Alessandra Fanfani, R. Davis, S. Petzold, B. W. Kennedy, P. Jovanovic, Tetsuro Mashimo, M. F. Turner-Watson, A. Jawahery, Austin Ball, Peter Krieger, Oana Elena Vickey Boeriu, Alessandro Montanari, I. Meyer, Peter Sherwood, Stan Bentvelsen, M. Kupper, G. Duckeck, W. Gorn, A. Macchiolo, J. Ludwig, K. Runge, P. Bock, I. Trigger, Thomas E Marchant, D. R. Ward, Peter R Hobson, T. J. McMahon, D. Zer-Zion, C. Couyoumtzelis, M. A. Thomson, J. Dubbert, R. K. Carnegie, E. K. U. Gross, D. E. Plane, Georges Azuelos, M. Sproston, E. Tsur, C. M. Hawkes, K. W. Bell, Kiyotomo Kawagoe, J. C. Hill, B. C. Shen, G. M. Dallavalle, Satoru Yamashita, M. Donkers, J. A. Wilson, Siegfried Bethke, W. G. Scott, I. Nakamura, J. Böhme, J. W. Gary, P. Mendez-Lorenzo, D. Glenzinski, P. Ferrari, Dezso Horvath, M. J. Losty, G. Karapetian, T. Trefzger, K. R. Hossain, K. Roscoe, German Martinez, Daniele Bonacorsi, E. Torrence, E. Clay, J. M. Roney, K. Harder, Koichi Nagai, J. Schieck, R. M. Brown, D. C. Imrie, Lorne Levinson, J. von Krogh, W. Mohr, I. R. Bailey, O. Biebel, G. P. Siroli, Christoph Schwick, M. Gruwé, M. Boutemeur, F. S. Merritt, M. Przybycień, T. Kress, A. A. Carter, Giovanni Abbiendi, H. O. Ogren, Christoph Geich-Gimbel, Vakhtang Kartvelishvili, S. L. Lloyd, J. E. Conboy, A. Fürtjes, Lutz Feld, Gregor Herten, and J. E. Pilcher
Subjects: Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), Meson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Perturbative QCD, Order (ring theory), 01 natural sciences, Photon structure function, Charm quark, Nuclear physics, Pseudorapidity, 0103 physical sciences, Production (computer science), High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The inclusive production of D*+- mesons in photon-photon collisions has been measured using the OPAL detector at LEP at e+e- centre-of-mass energies of 183 and 189GeV. The D* mesons are reconstructed in their decay to D0pi+ with the D0 observed in the two decay modes Kpi+ and Kpi+pi-pi+. After background subtraction, 100.4+-12.6(stat) D*+- mesons have been selected in events without observed scattered beam electron ("anti-tagged") and 29.8+-5.9 (stat) D*+- mesons in events where one beam electron is scattered into the detector ("single-tagged"). Direct and single-resolved events are studied separately. Differential cross-sections as functions of the D* transverse momentum p_t and pseudorapidity \eta are presented in the kinematic region 2
Published: 1999

125. Search for Higgs Bosons and Other Massive States decaying into two Photons in $e^{+}e^{-}$ Collisions at 189 GeV

Author: G Abbiendi, K Ackerstaff, G Alexander, J Allison, N Altekamp, K.J Anderson, S Anderson, S Arcelli, S Asai, S.F Ashby, D Axen, G Azuelos, A.H Ball, E Barberio, R.J Barlow, J.R Batley, S Baumann, J Bechtluft, T Behnke, K.W Bell, G Bella, A Bellerive, S Bentvelsen, S Bethke, S Betts, O Biebel, A Biguzzi, I.J Bloodworth, P Bock, J Böhme, D Bonacorsi, M Boutemeur, S Braibant, P Bright-Thomas, L Brigliadori, R.M Brown, H.J Burckhart, P Capiluppi, R.K Carnegie, A.A Carter, J.R Carter, C.Y Chang, D.G Charlton, D Chrisman, C Ciocca, P.E.L Clarke, E Clay, I Cohen, J.E Conboy, O.C Cooke, J Couchman, C Couyoumtzelis, R.L Coxe, M Cuffiani, S Dado, G.M Dallavalle, R Davis, S De Jong, A de Roeck, P Dervan, K Desch, B Dienes, M.S Dixit, J Dubbert, E Duchovni, G Duckeck, I.P Duerdoth, P.G Estabrooks, E Etzion, F Fabbri, A Fanfani, M Fanti, A.A Faust, L Feld, F Fiedler, M Fierro, I Fleck, A Frey, A Fürtjes, D.I Futyan, P Gagnon, J.W Gary, G Gaycken, C Geich-Gimbel, G Giacomelli, P Giacomelli, V Gibson, W.R Gibson, D.M Gingrich, D Glenzinski, J Goldberg, W Gorn, C Grandi, K Graham, E Gross, J Grunhaus, M Gruwé, C Hajdu, G.G Hanson, M Hansroul, M Hapke, K Harder, A Harel, C.K Hargrove, M Harin-Dirac, M Hauschild, C.M Hawkes, R Hawkings, R.J Hemingway, G Herten, R.D Heuer, M.D Hildreth, J.C Hill, P.R Hobson, A Hocker, K Hoffman, R.J Homer, A.K Honma, D Horváth, K.R Hossain, R Howard, P Hüntemeyer, P Igo-Kemenes, D.C Imrie, K Ishii, F.R Jacob, A Jawahery, H Jeremie, M Jimack, C.R Jones, P Jovanovic, T.R Junk, N Kanaya, J Kanzaki, D Karlen, V Kartvelishvili, K Kawagoe, T Kawamoto, P.I Kayal, R.K Keeler, R.G Kellogg, B.W Kennedy, D.H Kim, A Klier, T Kobayashi, M Kobel, T.P Kokott, M Kolrep, S Komamiya, R.V Kowalewski, T Kress, P Krieger, J von Krogh, T Kuhl, P Kyberd, G.D Lafferty, H Landsman, D Lanske, J Lauber, I Lawson, J.G Layter, D Lellouch, J Letts, L Levinson, R Liebisch, B List, C Littlewood, A.W Lloyd, S.L Lloyd, F.K Loebinger, G.D Long, M.J Losty, J Lu, J Ludwig, D Liu, A Macchiolo, A Macpherson, W Mader, M Mannelli, S Marcellini, A.J Martin, J.P Martin, G Martinez, T Mashimo, P Mättig, W.J McDonald, J McKenna, E.A Mckigney, T.J McMahon, R.A McPherson, F Meijers, P Mendez-Lorenzo, F.S Merritt, H Mes, A Michelini, S Mihara, G Mikenberg, D.J Miller, W Mohr, A Montanari, T Mori, K Nagai, I Nakamura, H.A Neal, R Nisius, S.W O'Neale, F.G Oakham, F Odorici, H.O Ogren, A Okpara, M.J Oreglia, S Orito, G Pásztor, J.R Pater, G.N Patrick, J Patt, R Perez-Ochoa, S Petzold, P Pfeifenschneider, J.E Pilcher, J Pinfold, D.E Plane, P Poffenberger, B Poli, J Polok, M Przybycień, A Quadt, C Rembser, H Rick, S Robertson, S.A Robins, N Rodning, J.M Roney, S Rosati, K Roscoe, A.M Rossi, Y Rozen, K Runge, O Runolfsson, D.R Rust, K Sachs, T Saeki, O Sahr, W.M Sang, E.K.G Sarkisyan, C Sbarra, A.D Schaile, O Schaile, P Scharff-Hansen, J Schieck, S Schmitt, A Schöning, M Schröder, M Schumacher, C Schwick, W.G Scott, R Seuster, T.G Shears, B.C Shen, C.H Shepherd-Themistocleous, P Sherwood, G.P Siroli, A Sittler, A Skuja, A.M Smith, G.A Snow, R Sobie, S Söldner-Rembold, S Spagnolo, M Sproston, A Stahl, K Stephens, J Steuerer, K Stoll, D Strom, R Ströhmer, B Surrow, S.D Talbot, P Taras, S Tarem, R Teuscher, M Thiergen, J Thomas, M.A Thomson, E Torrence, S Towers, I Trigger, Z Trócsányi, E Tsur, A.S Turcot, M.F Turner-Watson, I Ueda, R Van Kooten, P Vannerem, M Verzocchi, H Voss, F Wäckerle, A Wagner, C.P Ward, D.R Ward, P.M Watkins, A.T Watson, N.K Watson, P.S Wells, N Wermes, D Wetterling, J.S White, G.W Wilson, J.A Wilson, T.R Wyatt, S Yamashita, V Zacek, and D Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, FOS: Physical sciences, Fizikai tudományok, Fermion, Scalar boson, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Természettudományok, 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Boson
Abstract: A search is described for the generic process e+e- to X Y, where X is a neutral heavy scalar boson decaying into a pair of photons, and Y is a neutral heavy boson (scalar or vector) decaying into a fermion pair. The search is motivated mainly by the cases where either X, or both X and Y, are Higgs bosons. In particular, we investigate the case where X is the Standard Model Higgs boson and Y the Z0 boson. Other models with enhanced Higgs boson decay couplings to photon pairs are also considered. The present search combines the data set collected by the OPAL collaboration at 189 GeV collider energy, having an integrated luminosity of 182.6pb-1, with data samples collected at lower energies. The search results have been used to put 95% confidence level bounds, as functions of the mass of X, on the product of the cross-section and the relevant branching ratios, both in a model independent manner and for the particular models considered., Comment: 21 pages, LaTeX, including 5 eps figures, accepted by Phys. Lett. B
Published: 1999

126. Multi-photon production in e+e− collisions at √s = 189 GeV

Author: M. Schumacher, John Allison, Raimund Ströhmer, F. Odorici, Otmar Biebel, S. Yamashita, K. Hoffman, P. Igo-Kemenes, T. R. Junk, R. G. Kellogg, D. Axen, K. Ishii, H. Jeremie, P. Poffenberger, P. S. Wells, D. J. Miller, Dave Charlton, M. Fierro, I. J. Bloodworth, A. Jawahery, Csaba Hajdu, Oana Elena Vickey Boeriu, O. Runolfsson, S. Baumann, Stefano Marcellini, Terry Richard Wyatt, Claudio Grandi, J. S. White, O. C. Cooke, Ekg Sarkisyan, P. Pfeifenschneider, Peter Sherwood, R. Kowalewski, P. I. Kayal, Alexander Wagner, A. Macchiolo, S. Arcelli, E. A. Mckigney, Yoram Rozen, Beatrix Dienes, A. Biguzzi, A. J. Martin, O. Schaile, D. Lanske, R. D. Heuer, J. Ludwig, K. Runge, L. Brigliadori, J. Patt, André Schöning, Gideon Alexander, W. M. Sang, J. G. Layter, P. Bock, S. Robertson, Norbert Wermes, H. Mes, P. Scharff-Hansen, Paolo Capiluppi, I. P. Duerdoth, S. Braibant, J. Lauber, Sherry Towers, O. Sahr, Junichi Kanzaki, J. Polok, Erez Etzion, J. Couchman, A. Macpherson, T. Kawamoto, W. Mader, D. I. Futyan, C. K. Hargrove, D. Karlen, Gideon Bella, S. D. Talbot, S. W. O'Neale, R. L. Coxe, P. Hüntemeyer, Shlomit Tarem, Matthias Schröder, K. J. Anderson, M. Thiergen, A. M. Smith, P. E.L. Clarke, T. Kuhl, Stefan Schmitt, S. Orito, D. Chrisman, G. D. Long, H. J. Burckhart, Jacqueline Batley, Richard Nisius, Achim Stahl, A. D. Schaile, T. Behnke, B. Surrow, Gabriella Pasztor, Klaus Desch, C. H. Shepherd-Themistocleous, B. List, P. Vannerem, C. Sbarra, F. R. Jacob, J. P. Martin, A. M. Rossi, P. G. Estabrooks, R. K. Keeler, Richard Teuscher, R. Howard, F. Fiedler, Marco Cuffiani, R. Hawkings, K. Stoll, Stephen Lloyd, H. Landsman, Andris Skuja, C. Y. Chang, S. Petzold, S. Betts, Ehud Duchovni, S. De Jong, G. A. Snow, C. P. Ward, N. K. Watson, Arnulf Quadt, M. Hapke, S. Rosati, Tetsuro Mashimo, Shoji Asai, P. Taras, J. Goldberg, K. Stephens, M. F. Turner-Watson, K. Graham, Tara Shears, M. Jimack, Paul Kyberd, Naoko Kanaya, F. K. Loebinger, S. Söldner-Rembold, H. Rick, A. Michelini, Ivor Fleck, M. Watkins, C. R. Jones, P. Gagnon, A. Harel, A Höcker, C. Littlewood, Ikuo Ueda, D. M. Strom, J. Lu, J. Letts, Joleen Pater, T. Kobayashi, A. Klier, F. G. Oakham, W. Gorn, Zoltan Laszlo Trocsanyi, Dong Hee Kim, M. J. Oreglia, Daniel Lellouch, E. L. Barberio, A. W. Lloyd, G. W. Wilson, Takehiko Mori, I. Cohen, H. A. Neal, Peter R Hobson, Thomas E Marchant, Paolo Giacomelli, K. Sachs, Shlomo Dado, G. G. Hanson, M. Hansroul, A. A. Faust, A. Okpara, P. Mättig, Christoph Rembser, James Pinfold, R. Perez-Ochoa, R. Seuster, S. A. Robins, S.J. Dallison, M. Hauschild, Michael Hildreth, Alain Bellerive, R. J. Hemingway, G. Giacomelli, I. Lawson, J. Lillich, Christopher Hawkes, I. Trigger, M. Verzocchi, R. Liebisch, K. Ackerstaff, M. Kolrep, A. De Roeck, M. Kobel, B. W. Kennedy, D. Zer-Zion, D. R. Ward, J. R. Carter, G. N. Patrick, Sachio Komamiya, M. Harin-Dirac, V. Zacek, A. T. Watson, P. Jovanovic, Austin Ball, N. L. Rodning, Peter Krieger, Giora Mikenberg, J. W. Gary, R. J. Homer, M. S. Dixit, Frans Meijers, Satoshi Mihara, S. F. Ashby, Marcello Mannelli, S. B. Anderson, Alessandro Montanari, I. Meyer, P. Dervan, B. Poli, H. Voss, R. J. Barlow, T. P. Kokott, D. Waller, Stan Bentvelsen, S. Spagnolo, T. Saeki, Randall Sobie, G. D. Lafferty, Alessandra Fanfani, R. Davis, Guenter Duckeck, J. Grunhaus, Juergen Thomas, Claudia Ciocca, M. Fanti, D. E. Plane, G. M. Dallavalle, P. Ferrari, K. Roscoe, German Martinez, Robert McPherson, E. Torrence, J. M. Roney, W. J. McDonald, E. Clay, B. C. Shen, M. Donkers, M. Przybycień, T. Kress, Kiyotomo Kawagoe, T. Trefzger, Siegfried Bethke, D. Liu, A. K. Honma, A. A. Carter, Koichi Nagai, K. R. Hossain, Fabrizio Fabbri, A. Frey, J. Schieck, W. R. Gibson, W. G. Scott, D. C. Imrie, K. Harder, I. Nakamura, W. Mohr, Giovanni Abbiendi, G. P. Siroli, Daniele Bonacorsi, Christoph Schwick, D. R. Rust, R. M. Brown, Lorne Levinson, P. Mendez-Lorenzo, D. Glenzinski, J. von Krogh, Dezso Horvath, M. J. Losty, M. A. Thomson, M. Gruwé, D. Wetterling, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, J. A. Wilson, J. Böhme, E. K. U. Gross, R. Van Kooten, M. Sproston, F. Wäckerle, D. M. Gingrich, Georges Azuelos, E. Tsur, K. W. Bell, J. C. Hill, M. Boutemeur, F. S. Merritt, J. Bechtluft, J. A. McKenna, H. O. Ogren, Christoph Geich-Gimbel, Vakhtang Kartvelishvili, J. E. Conboy, A. Fürtjes, Lutz Feld, Gregor Herten, J. E. Pilcher, G. Gaycken, and P. G. Bright-Thomas
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Photon, 010308 nuclear & particles physics, Branching fraction, Electron–positron annihilation, Resonance, Context (language use), 01 natural sciences, 7. Clean energy, Nuclear physics, Excited state, 0103 physical sciences, High Energy Physics::Experiment, Invariant mass, 010306 general physics
Abstract: The process e+e−→γγ(γ) is studied using data recorded with the OPAL detector at LEP. The data sample taken at a centre-of-mass energy of 189 GeV corresponds to a total integrated luminosity of 178 pb−1. The measured cross-section agrees well with the expectation from QED. A fit to the angular distribution is used to obtain improved limits at 95% CL on the QED cut-off parameters: Λ+> 304 GeV and Λ−> 295 GeV as well as a mass limit for an excited electron, Me* > 306 GeV assuming equal e*ey and eeγ couplings. Graviton exchange in the context of theories with higher dimensions is excluded for scales G+< 660 GeV and G−< 634 GeV. No evidence for resonance production is found in the invariant mass spectrum of photon pairs. Limits are obtained for the cross-section times branching ratio for a resonance decaying into two photons and produced in association with another photon.
Published: 1999

127. Measurement of the W Mass and Width in $e^{+}e^{-}$ Collisions at 183 GeV

Author: G. Abbiendi, K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, J.E. Conboy, O.C. Cooke, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, R. Davis, S. De Jong, A. de Roeck, P. Dervan, K. Desch, B. Dienes, M.S. Dixit, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, P.G. Estabrooks, E. Etzion, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, I. Fleck, R. Folman, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, K. Graham, E. Gross, J. Grunhaus, M. Gruwé, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, A. Harel, C.K. Hargrove, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, P.R. Hobson, M. Hoch, A. Hocker, K. Hoffman, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, D.H. Kim, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, P. Kyberd, G.D. Lafferty, H. Landsman, D. Lanske, J. Lauber, S.R. Lautenschlager, I. Lawson, J.G. Layter, D. Lazic, A.M. Lee, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, C. Markopoulos, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, J. Polok, M. Przybycień, C. Rembser, H. Rick, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, S. Spagnolo, M. Sproston, A. Stahl, K. Stephens, J. Steuerer, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, J. Thomas, M.A. Thomson, E. von Törne, E. Torrence, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, I. Ueda, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, FOS: Physical sciences, 01 natural sciences, Direct measure, Standard Model, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Particle Physics - Experiment
Abstract: Using a data sample of 57 pb-1 recorded at a centre-of-mass energy of 183 GeV with the Opal detector at LEP, 282 W+W- -> qqqq and 300 W+W- -> qqlnu candidate events are used to obtain a measurement of the mass of the W boson, W_W = 80.39 +- 0.13(stat.) +- 0.05(syst.) GeV assuming the Standard Model relation between M_W and Gam_W. A second fit provides a direct measure of the width of the W boson and gives Gam_W = 1.96 +- 0.34(stat.) +- 0.20(syst.) GeV. These results are combined with previous OPAL results to obtain M_W = 80.38 +- 0.12(stat.) +- 0.05(syst.) GeV and Gam_W = 1.84 +- 0.32(stat.) +- 0.20(syst.) GeV., 21 pages, LaTeX, 4 eps figs included, submitted to Physics Letters B
Published: 1998

128. Spatial Resolution Attainable with Cathode Strip Chambers at the Trigger Level

Author: Jay Hauser, S. Durkin, J Zeng, S. Otwinowski, S Medved, D Chrisman, Christian P. Minor, J. Hoftiezer, Y. Bonushkin, Hafeez R Hoorani, I Smirnov, T. Muller, T Vercelli, V Soulimov, C. Rush, P Schenk, A Vaniachine, G. Mitselmakher, J.G Layter, P Lennous, O Kisselev, Thomas Ferguson, Paolo Giacomelli, J.C. Santiard, L Preston, L Gorn, C. Matthey, T.Y Ling, Andrey Korytov, D.E Klem, E. von Goeler, M.M Baarmand, O. Prokofiev, W. Gorn, J Hirschfelder, J. Fitch, and Craig R. Wuest
Subjects: Physics, Nuclear and High Energy Physics, Muon, business.industry, Physics::Instrumentation and Detectors, Bremsstrahlung, STRIPS, Cathode, law.invention, Nuclear physics, Optics, law, Carbon–fluorine bond, Physics::Accelerator Physics, High Energy Physics::Experiment, Detectors and Experimental Techniques, business, Instrumentation, Image resolution, Beam (structure)
Abstract: A simple network of comparators applied to the strip signals of a cathode strip chamber allows quick hit localization to within a halfstrip width, or ± a quarter-strip. A six-plane chamber with 6.4 mm wide strips was tested in a high-energy muon beam. The chamber was placed behind a 30 cm thick iron block. We show that patterns of hits localized to within a halfstrip allowed us to identify 300 GeV/c muon tracks with 99% probability and 0.7 mm spatial resolution in the presence of bremsstrahlung radiation. This technique of finding muon tracks will be used in the cathode strip chambers of the CMS Endcap Muon System.
Published: 1998

129. Search for Higgs Bosons and New Particles Decaying into Two Photons at sqrt(s) = 183 GeV

Author: K Ackerstaff, G Alexander, J Allison, N Altekamp, K.J Anderson, S Anderson, S Arcelli, S Asai, S.F Ashby, D Axen, G Azuelos, A.H Ball, E Barberio, R.J Barlow, R Bartoldus, J.R Batley, S Baumann, J Bechtluft, T Behnke, K.W Bell, G Bella, S Bentvelsen, S Bethke, S Betts, O Biebel, A Biguzzi, S.D Bird, V Blobel, I.J Bloodworth, M Bobinski, P Bock, J Böhme, M Boutemeur, S Braibant, P Bright-Thomas, R.M Brown, H.J Burckhart, C Burgard, R Bürgin, P Capiluppi, R.K Carnegie, A.A Carter, J.R Carter, C.Y Chang, D.G Charlton, D Chrisman, C Ciocca, P.E.L Clarke, E Clay, I Cohen, J.E Conboy, O.C Cooke, C Couyoumtzelis, R.L Coxe, M Cuffiani, S Dado, G.M Dallavalle, R Davis, S De Jong, L.A del Pozo, A de Roeck, K Desch, B Dienes, M.S Dixit, M Doucet, J Dubbert, E Duchovni, G Duckeck, I.P Duerdoth, D Eatough, P.G Estabrooks, E Etzion, H.G Evans, F Fabbri, A Fanfani, M Fanti, A.A Faust, F Fiedler, M Fierro, H.M Fischer, I Fleck, R Folman, A Fürtjes, D.I Futyan, P Gagnon, J.W Gary, J Gascon, S.M Gascon-Shotkin, C Geich-Gimbel, T Geralis, G Giacomelli, P Giacomelli, V Gibson, W.R Gibson, D.M Gingrich, D Glenzinski, J Goldberg, W Gorn, C Grandi, E Gross, J Grunhaus, M Gruwé, G.G Hanson, M Hansroul, M Hapke, C.K Hargrove, C Hartmann, M Hauschild, C.M Hawkes, R Hawkings, R.J Hemingway, M Herndon, G Herten, R.D Heuer, M.D Hildreth, J.C Hill, S.J Hillier, P.R Hobson, A Hocker, R.J Homer, A.K Honma, D Horváth, K.R Hossain, R Howard, P Hüntemeyer, P Igo-Kemenes, D.C Imrie, K Ishii, F.R Jacob, A Jawahery, H Jeremie, M Jimack, A Joly, C.R Jones, P Jovanovic, T.R Junk, D Karlen, V Kartvelishvili, K Kawagoe, T Kawamoto, P.I Kayal, R.K Keeler, R.G Kellogg, B.W Kennedy, A Klier, S Kluth, T Kobayashi, M Kobel, D.S Koetke, T.P Kokott, M Kolrep, S Komamiya, R.V Kowalewski, T Kress, P Krieger, J von Krogh, P Kyberd, G.D Lafferty, D Lanske, J Lauber, S.R Lautenschlager, I Lawson, J.G Layter, D Lazic, A.M Lee, E Lefebvre, D Lellouch, J Letts, L Levinson, R Liebisch, B List, C Littlewood, A.W Lloyd, S.L Lloyd, F.K Loebinger, G.D Long, M.J Losty, J Ludwig, D Liu, A Macchiolo, A Macpherson, M Mannelli, S Marcellini, C Markopoulos, A.J Martin, J.P Martin, G Martinez, T Mashimo, P Mättig, W.J McDonald, J McKenna, E.A Mckigney, T.J McMahon, R.A McPherson, F Meijers, S Menke, F.S Merritt, H Mes, J Meyer, A Michelini, S Mihara, G Mikenberg, D.J Miller, R Mir, W Mohr, A Montanari, T Mori, K Nagai, I Nakamura, H.A Neal, B Nellen, R Nisius, S.W O'Neale, F.G Oakham, F Odorici, H.O Ogren, M.J Oreglia, S Orito, J Pálinkás, G Pásztor, J.R Pater, G.N Patrick, J Patt, R Perez-Ochoa, S Petzold, P Pfeifenschneider, J.E Pilcher, J Pinfold, D.E Plane, P Poffenberger, B Poli, J Polok, M Przybycień, C Rembser, H Rick, S Robertson, S.A Robins, N Rodning, J.M Roney, K Roscoe, A.M Rossi, Y Rozen, K Runge, O Runolfsson, D.R Rust, K Sachs, T Saeki, O Sahr, W.M Sang, E.K.G Sarkisyan, C Sbarra, A.D Schaile, O Schaile, F Scharf, P Scharff-Hansen, J Schieck, B Schmitt, S Schmitt, A Schöning, T Schorner, M Schröder, M Schumacher, C Schwick, W.G Scott, R Seuster, T.G Shears, B.C Shen, C.H Shepherd-Themistocleous, P Sherwood, G.P Siroli, A Sittler, A Skuja, A.M Smith, G.A Snow, R Sobie, S Söldner-Rembold, M Sproston, A Stahl, K Stephens, J Steuerer, K Stoll, D Strom, R Ströhmer, R Tafirout, S.D Talbot, S Tanaka, P Taras, S Tarem, R Teuscher, M Thiergen, M.A Thomson, E von Törne, E Torrence, S Towers, I Trigger, Z Trócsányi, E Tsur, A.S Turcot, M.F Turner-Watson, R Van Kooten, P Vannerem, M Verzocchi, P Vikas, H Voss, F Wäckerle, A Wagner, C.P Ward, D.R Ward, P.M Watkins, A.T Watson, N.K Watson, P.S Wells, N Wermes, J.S White, G.W Wilson, J.A Wilson, T.R Wyatt, S Yamashita, G Yekutieli, V Zacek, and D Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Gauge boson, Particle physics, Photon, 010308 nuclear & particles physics, Hadron, Scalar (mathematics), High Energy Physics::Phenomenology, FOS: Physical sciences, Fermion, 01 natural sciences, 3. Good health, Standard Model, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Higgs boson, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Boson
Abstract: A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a data sample of 57.7 pb-1 collected at an average center-of-mass energy of 182.6 GeV with the OPAL detector at LEP. No evidence for contributions from non-Standard Model physics processes was observed. The observed candidates are used to place limits on BR (H to gamma gamma) assuming a Standard Model production rate for Higgs boson masses up to 92 GeV, and on the production cross section for a scalar resonance decaying into di-photons up to a mass of 170 GeV. Upper limits on the product of cross section and branching ratios, sigma(e+e- to XY) * BR(X to gamma gamma) * BR(Y to f fbar) as low as 70fb are obtained over the M(X) range 10 - 170 GeV for the case where 10 < M(Y) < 160 GeV and M(X)+M(Y) > 90 GeV, independent of the nature of Y provided it decays to a fermion pair and has negligible width. Higgs scalars which couple only to gauge bosons at Standard Model strength are ruled out up to a mass of 90.0 GeV at the 95% confidence level. Limits are also placed on non-minimal Higgs sectors having triplet representations., 21 pages, LaTeX, 4 eps figures included, submitted to Physics Letters B
Published: 1998

130. Measurement of the average polarization of b baryons in hadronic $Z^0$ decays

Author: G. Abbiendi, K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, M. Bobinski, P. Bock, J. Böhme, D. Bonacorsi, M. Boutemeur, S. Braibant, P. Bright-Thomas, L. Brigliadori, R.M. Brown, H.J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, J.E. Conboy, O.C. Cooke, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, R. Davis, S. De Jong, L.A. del Pozo, A. de Roeck, K. Desch, B. Dienes, M.S. Dixit, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, P.G. Estabrooks, E. Etzion, H.G. Evans, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, I. Fleck, R. Folman, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, E. Gross, J. Grunhaus, M. Gruwé, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, C.K. Hargrove, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, S.J. Hillier, P.R. Hobson, A. Hocker, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, P. Kyberd, G.D. Lafferty, D. Lanske, J. Lauber, S.R. Lautenschlager, I. Lawson, J.G. Layter, D. Lazic, A.M. Lee, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, C. Markopoulos, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, J. Polok, M. Przybycień, C. Rembser, H. Rick, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, M. Sproston, A. Stahl, K. Stephens, J. Steuerer, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, M.A. Thomson, E. von Törne, E. Torrence, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Physics, Semileptonic decay, Nuclear and High Energy Physics, Particle physics, Missing energy, 010308 nuclear & particles physics, Hadron, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, Lambda baryon, 01 natural sciences, High Energy Physics - Experiment, Baryon, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, Baryon number, Neutrino, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract: In the Standard Model, b quarks produced in e^+e^- annihilation at the Z^0 peak have a large average longitudinal polarization of -0.94. Some fraction of this polarization is expected to be transferred to b-flavored baryons during hadronization. The average longitudinal polarization of weakly decaying b baryons, , is measured in approximately 4.3 million hadronic Z^0 decays collected with the OPAL detector between 1990 and 1995 at LEP. Those b baryons that decay semileptonically and produce a \Lambda baryon are identified through the correlation of the baryon number of the \Lambda and the electric charge of the lepton. In this semileptonic decay, the ratio of the neutrino energy to the lepton energy is a sensitive polarization observable. The neutrino energy is estimated using missing energy measurements. From a fit to the distribution of this ratio, the value = -0.56^{+0.20}_{-0.13} +/- 0.09 is obtained, where the first error is statistical and the second systematic., Comment: 19 pages, LaTeX, 4 eps figures included, submitted to Phys. Lett. B
Published: 1998

131. Measurement of the Q(2) evolution of the photon structure function F-2(gamma)

Author: K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, T. Barillari, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, C. Beeston, T. Behnke, A.N. Bell, K.W. Bell, G. Bella, S. Bentvelsen, S. Bethke, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, J.E. Bloomer, M. Bobinski, P. Bock, D. Bonacorsi, M. Boutemeur, B.T. Bouwens, S. Braibant, L. Brigliadori, R.M. Brown, H.J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, P.E.L. Clarke, I. Cohen, J.E. Conboy, O.C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola, G.M. Dallavalle, R. Davies, S. De Jong, L.A. del Pozo, K. Desch, B. Dienes, M.S. Dixit, E. do Couto e Silva, M. Doucet, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, J.E.G. Edwards, P.G. Estabrooks, H.G. Evans, M. Evans, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, H.M. Fischer, I. Fleck, R. Folman, D.G. Fong, M. Foucher, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, N.I. Geddes, C. Geich-Gimbel, T. Geralis, G. Giacomelli, P. Giacomelli, R. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, M.J. Goodrick, W. Gorn, C. Grandi, E. Gross, J. Grunhaus, M. Gruwé, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, C.K. Hargrove, P.A. Hart, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, S.J. Hillier, P.R. Hobson, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, D.E. Hutchcroft, P. Igo-Kemenes, D.C. Imrie, M.R. Ingram, K. Ishii, A. Jawahery, P.W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, C.R. Jones, G. Jones, M. Jones, U. Jost, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, J. Kirk, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G.D. Lafferty, R. Lahmann, W.P. Lai, D. Lanske, J. Lauber, S.R. Lautenschlager, J.G. Layter, D. Lazic, A.M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, A. Macchiolo, A. Macpherson, M. Mannelli, S. Marcellini, C. Markus, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, G. Mikenberg, D.J. Miller, A. Mincer, R. Mir, W. Mohr, A. Montanari, T. Mori, M. Morii, U. Müller, S. Mihara, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Oh, N.J. Oldershaw, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, M.J. Pearce, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, B. Poli, A. Posthaus, D.L. Rees, D. Rigby, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, A. Rooke, E. Ros, A.M. Rossi, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, U. Ruppel, D.R. Rust, R. Rylko, K. Sachs, T. Saeki, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, P. Schenk, J. Schieck, P. Schleper, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, H.C. Schultz-Coulon, M. Schumacher, C. Schwick, W.G. Scott, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skillman, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, R.W. Springer, M. Sproston, K. Stephens, J. Steuerer, B. Stockhausen, K. Stoll, D. Strom, P. Szymanski, R. Tafirout, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, M.A. Thomson, E. von Törne, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, P. Utzat, R. Van Kooten, M. Verzocchi, P. Vikas, E.H. Vokurka, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, B. Wilkens, G.W. Wilson, J.A. Wilson, G. Wolf, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), 010308 nuclear & particles physics, 2-Photon Production Processes, Microvertex Detector, FOS: Physical sciences, LEP, Generator, 01 natural sciences, Photon structure function, Luminosity, High Energy Physics - Experiment, Q2, Scattering, GEV2, High Energy Physics - Experiment (hep-ex), High-Energy, 0103 physical sciences, Leading Order, 010306 general physics, Opal Detector, Particle Physics - Experiment
Abstract: New measurements are presented of the photon structure function F_2^gamma(Q) at four values of Q^2 between 9 and 59 GeV/c^2 based on data collected with the OPAL detector at centre-of-mass energies of 161-172 GeV, with a total integrated luminosity of 18.1 pb^-1. The evolution of F_2^gamma with Q^2 in bins of x is determined in the Q^2 range from 1.86 to 135 GeV/c^2 using data taken at centre-of-mass energies of 91 GeV and 161-172 GeV. F_2^gamma is observed to increase with Q^2 with a slope of 1/alpha_em dF_2^gamma/dln(Q^2) = 0.10 +0.05 -0.03 measured in the range 0.1 < x < 0.6., 22 pages, LaTeX, 4 eps figures included, accepted by Phys. Lett. B
Published: 1998

132. Production of Chi_c2 Mesons in Photon-Photon Collisions at LEP

Author: K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, S.F. Ashby, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, T. Barillari, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, T. Behnke, K.W. Bell, G. Bella, A. Bellerive, S. Bentvelsen, S. Bethke, S. Betts, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, M. Bobinski, P. Bock, J. Böhme, M. Boutemeur, S. Braibant, P. Bright-Thomas, R.M. Brown, H.J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, C. Ciocca, P.E.L. Clarke, E. Clay, I. Cohen, J.E. Conboy, O.C. Cooke, C. Couyoumtzelis, R.L. Coxe, M. Cuffiani, S. Dado, G.M. Dallavalle, R. Davis, S. De Jong, L.A. del Pozo, A. de Roeck, K. Desch, B. Dienes, M.S. Dixit, J. Dubbert, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, P.G. Estabrooks, E. Etzion, H.G. Evans, F. Fabbri, A. Fanfani, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, I. Fleck, R. Folman, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, G. Gaycken, C. Geich-Gimbel, G. Giacomelli, P. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, W. Gorn, C. Grandi, E. Gross, J. Grunhaus, M. Gruwé, G.G. Hanson, M. Hansroul, M. Hapke, K. Harder, C.K. Hargrove, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, S.J. Hillier, P.R. Hobson, A. Hocker, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, P. Igo-Kemenes, D.C. Imrie, K. Ishii, F.R. Jacob, A. Jawahery, H. Jeremie, M. Jimack, C.R. Jones, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, R.V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, T. Kuhl, P. Kyberd, G.D. Lafferty, D. Lanske, J. Lauber, S.R. Lautenschlager, I. Lawson, J.G. Layter, D. Lazic, A.M. Lee, D. Lellouch, J. Letts, L. Levinson, R. Liebisch, B. List, C. Littlewood, A.W. Lloyd, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, D. Liu, A. Macchiolo, A. Macpherson, W. Mader, M. Mannelli, S. Marcellini, C. Markopoulos, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, S. Mihara, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, B. Poli, J. Polok, M. Przybycień, C. Rembser, H. Rick, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, K. Roscoe, A.M. Rossi, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, K. Sachs, T. Saeki, O. Sahr, W.M. Sang, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, J. Schieck, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, M. Schumacher, C. Schwick, W.G. Scott, R. Seuster, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, M. Sproston, A. Stahl, K. Stephens, J. Steuerer, K. Stoll, D. Strom, R. Ströhmer, B. Surrow, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, M.A. Thomson, E. von Törne, E. Torrence, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, R. Van Kooten, P. Vannerem, M. Verzocchi, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, G.W. Wilson, J.A. Wilson, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Meson, 010308 nuclear & particles physics, Branching fraction, Detector, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Production (computer science), High Energy Physics::Experiment, Channel (broadcasting), 010306 general physics, Particle Physics - Experiment
Abstract: We present an observation at LEP of the production of chi_c2 mesons in the collisions of two quasi-real photons using the OPAL detector. The chi_c2 mesons are reconstructed in the decay channel Chi_c2 to J/psi gamma to l+l- gamma (with l= e,mu) using all data taken at e+e- centre-of-mass energies of 91 and 183 GeV, corresponding to integrated luminosities of 167 and 55 pb-1 respectively. The two-photon width of the Chi_2 is determined to be 1.76 +- 0.47 +- 0.37 +- 0.15 keV where the first error is statistical, the second is systematic and the third comes from branching ratio uncertainties., Comment: 18 pages, LaTeX, 6 eps figures included, submitted to Physics Letters B
Published: 1998
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133. Search for chargino and neutralino production at root s=170 and 172 GeV at LEP

Author: D. R. Rust, L. Brigliadori, Kiyotomo Kawagoe, P. G. Estabrooks, R. K. Keeler, T. Behnke, A. M. Lee, N. K. Watson, W. J. McDonald, P. M. Watkins, John Allison, E. von Törne, K. R. Hossain, D. Chrisman, G. D. Long, Volker Blobel, S. W. O'Neale, K. J. Anderson, Stephen Lloyd, T. J. McMahon, R. G. Kellogg, A. Macchiolo, M. Gruwé, C. M. Hawkes, C. Dallapiccola, B. C. Shen, Siegfried Bethke, A. K. Honma, W. G. Scott, I. Nakamura, P. E.L. Clarke, M. K. Jones, J. P. Martin, C. Hartmann, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, Csaba Hajdu, Richard Teuscher, A. S. Turcot, Stefano Marcellini, F. Fiedler, U. Müller, A. J. Martin, J. Letts, M. Fanti, P. Poffenberger, M. Fierro, J. E.G. Edwards, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Davis, Silvia Arcelli, M. Schumacher, E. Lefebvre, Richard Nisius, U. Ruppel, M. R. Ingram, D. E. Plane, Stephen Hillier, D. Glenzinski, G. M. Dallavalle, Dezso Horvath, M. J. Losty, S. De Jong, O. C. Cooke, P. Pfeifenschneider, D. Lazic, J. Steuerer, Ivor Fleck, Joleen Pater, K. Sachs, Shlomo Dado, Robert McPherson, F. Odorici, J. Patt, Beatrix Dienes, G. Yekutieli, A. Klier, R. Giacomelli, A. Oh, C. K. Hargrove, Ekg Sarkisyan, P. W. Jeffreys, S. Baumann, E. A. Mckigney, W. P. Lai, Marco Cuffiani, Mathieu Doucet, R. D. Heuer, Tara Shears, Jean-Arcady Meyer, A. Schüning, A. N. Bell, P. S. Wells, S. Yamashita, P. Igo-Kemenes, M. Boutemeur, F. S. Merritt, A. A. Carter, Ron Folman, Gideon Alexander, James Pinfold, Paolo Capiluppi, R. Perez-Ochoa, D. G. Fong, Fabrizio Fabbri, J. M. Roney, R. Van Kooten, P. A. Hart, J. Gascon, N. Altekamp, H. Voss, Ehud Duchovni, R. J. Barlow, M. Jimack, Terry Richard Wyatt, K. Ishii, Paolo Giacomelli, H. Jeremie, J. E. Bloomer, M. Hansroul, A. Michelini, P. Müttig, M. Kolrep, Giora Mikenberg, P. Utzat, Satoshi Tanaka, T. Kobayashi, M. J. Pearce, D. I. Futyan, M. Hapke, C. Burgard, C. Y. Chang, R. J. Homer, A. Macpherson, Satoshi Mihara, G. G. Hanson, Gideon Bella, Daniele Bonacorsi, D. J. Miller, S. Braibant, A. D. Schaile, Gabriella Pasztor, M. A. Thomson, H. Mes, I. P. Duerdoth, P. Taras, Michael Kobel, F. Wäckerle, P. Vikas, J. von Krogh, D. Lanske, J. W. Gary, A. Joly, Reda Tafirout, Klaus Kurt Desch, M. Thiergen, O. Schaile, S. B. Anderson, E. do Couto e Silva, P. Szymanski, H. J. Burckhart, Jacqueline Batley, R. Howard, J. Grunhaus, Claire Shepherd-Themistocleous, J. S. White, E. K. U. Gross, G. W. Wilson, D. S. Koetke, Marcello Mannelli, D. M. Gingrich, C. Sbarra, J. Bechtluft, U. Jost, R. Mir, Allen Mincer, Stan Bentvelsen, G. Giacomelli, J. A. McKenna, G. A. Snow, C. P. Ward, D. E. Hutchcroft, M. J. Oreglia, Julie Kirk, P. Hüntemeyer, P. Scharff-Hansen, M. S. Dixit, L. A. del Pozo, S. R. Lautenschlager, H. A. Neal, Frans Meijers, M. Sproston, Sven Menke, K. Stephens, S. Söldner-Rembold, D. M. Strom, M. Hauschild, R. Hawkings, C. Markus, P. Gagnon, A. A. Faust, R. Rylko, A. M. Smith, Hans-Christian Schultz-Coulon, Randall Sobie, G. D. Lafferty, O. Runolfsson, W. R. Gibson, A. Biguzzi, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, S. M. Gascon-Shotkin, B. T. Bouwens, G. T. Jones, E. H. Vokurka, K. Stoll, Andris Skuja, S. Petzold, C. R. Jones, R. M. Brown, Tetsuro Mashimo, Lorne Levinson, F. G. Oakham, C. Beeston, B. Schmitt, Vakhtang Kartvelishvili, A. Skillman, V. Gibson, E. L. Barberio, A. Rooke, J. G. Layter, Guenter Duckeck, J. E. Conboy, A. Fürtjes, J. R. Carter, W. Gorn, Claudio Grandi, M. Schrüder, D. Rigby, R. J. Hemingway, D. L. Rees, G. N. Patrick, B. W. Kennedy, T. R. Junk, Dave Charlton, P. Jovanovic, Austin Ball, F. Scharf, Otmar Biebel, M. F. Turner-Watson, M. Morii, Peter Krieger, Peter R Hobson, S. Robertson, Gregor Herten, B. Wilkens, German Martinez, Alessandro Montanari, D. Zer-Zion, P. Routenburg, I. Trigger, R. Bürgin, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, J. E. Pilcher, D. R. Ward, T. Kress, J. Schieck, W. Mohr, A. Sittler, T. P. Kokott, A. Posthaus, T. Saeki, P. I. Kayal, N. J. Oldershaw, Peter Schleper, Zoltan Laszlo Trocsanyi, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, S. D. Bird, P. Schenk, D. Axen, A. Jawahery, Matthew Evans, Peter Sherwood, Alexander Wagner, A. M. Rossi, J. Ludwig, K. Runge, P. Bock, J. Lauber, H. M. Fischer, S. D. Talbot, D. Eatough, N. I. Geddes, Michael Hildreth, N. L. Rodning, B. Poli, R. W. Springer, Georges Azuelos, E. Tsur, M. Verzocchi, K. W. Bell, J. Pálinkás, J. C. Hill, S. A. Robins, Gunter Wolf, K. Ackerstaff, I. J. Bloodworth, Yoram Rozen, R. Lahmann, D. C. Imrie, M. Foucher, Stefan Kluth, Shlomit Tarem, G. P. Siroli, J. Goldberg, B. Nellen, Christoph Schwick, H. G. Evans, D. Karlen, M. J. Goodrick, I. Cohen, Daniel Lellouch, Takehiko Mori, V. Zacek, Stefan Schmitt, Shoji Asai, and K. Nagai
Subjects: Physics, Particle physics, E+E ANNIHILATION, Physics and Astronomy (miscellaneous), ENERGIES, Electron–positron annihilation, Scalar (mathematics), P(P)OVER-BAR COLLISIONS, Lower limit, PARAMETERS, OPAL DETECTOR, CROSS-SECTIONS, Nuclear physics, PHYSICS, Pair production, Chargino, SUPERSYMMETRIC PARTICLES, Neutralino, MONTE-CARLO PROGRAM, TEV, Engineering (miscellaneous), Minimal Supersymmetric Standard Model
Abstract: A search for charginos and neutralinos, predicted by supersymmetric theories, is performed using a data sample of 182.1 pb-1 taken at a centre-of-mass energy of 189 GeV with the OPAL detector at LEP. No evidence for chargino or neutralino production is found. Upper limits on chargino and neutralino pair production (X1+X1-, X10X20) cross-sections are obtained as a function of the chargino mass (mX1±), the lightest neutralino mass (mX10) and the second lightest neutralino mass (mX20). Within the Constrained Minimal Supersymmetric Standard Model framework, and for mX1± - mX10 ≥ 5 GeV, the 95% confidence level lower limits on mX1± are 93.6 GeV for tan β = 1.5 and 94.1 GeV for tan β = 35. These limits are obtained assuming a universal scalar mass m0 ≥ 500 GeV. The corresponding limits for all m0 are 78.0 and 71.7 GeV. The 95% confidence level lower limits on the lightest neutralino mass, valid for any value of tan β are 32.8 GeV for m0 ≥ 500 GeV and 31.6 GeV for all m0.
Published: 1998

134. Search for stable and long-lived massive charged particles in e(+)e(-) collisions at root s=130-183 GeV

Author: K Ackerstaff, G Alexander, J Allison, N Altekamp, K.J Anderson, S Anderson, S Arcelli, S Asai, S.F Ashby, D Axen, G Azuelos, A.H Ball, E Barberio, R.J Barlow, R Bartoldus, J.R Batley, S Baumann, J Bechtluft, T Behnke, K.W Bell, G Bella, S Bentvelsen, S Bethke, S Betts, O Biebel, A Biguzzi, S.D Bird, V Blobel, I.J Bloodworth, M Bobinski, P Bock, D Bonacorsi, M Boutemeur, S Braibant, L Brigliadori, R.M Brown, H.J Burckhart, C Burgard, R Bürgin, P Capiluppi, R.K Carnegie, A.A Carter, J.R Carter, C.Y Chang, D.G Charlton, D Chrisman, P.E.L Clarke, I Cohen, J.E Conboy, O.C Cooke, C Couyoumtzelis, R.L Coxe, M Cuffiani, S Dado, C Dallapiccola, G.M Dallavalle, R Davis, S De Jong, L.A del Pozo, A de Roeck, K Desch, B Dienes, M.S Dixit, M Doucet, E Duchovni, G Duckeck, I.P Duerdoth, D Eatough, P.G Estabrooks, E Etzion, H.G Evans, M Evans, F Fabbri, A Fanfani, M Fanti, A.A Faust, L Feld, F Fiedler, M Fierro, H.M Fischer, I Fleck, R Folman, D.G Fong, M Foucher, A Fürtjes, D.I Futyan, P Gagnon, J.W Gary, J Gascon, S.M Gascon-Shotkin, N.I Geddes, C Geich-Gimbel, T Geralis, G Giacomelli, P Giacomelli, R Giacomelli, V Gibson, W.R Gibson, D.M Gingrich, D Glenzinski, J Goldberg, M.J Goodrick, W Gorn, C Grandi, E Gross, J Grunhaus, M Gruwé, C Hajdu, G.G Hanson, M Hansroul, M Hapke, C.K Hargrove, P.A Hart, C Hartmann, M Hauschild, C.M Hawkes, R Hawkings, R.J Hemingway, M Herndon, G Herten, R.D Heuer, M.D Hildreth, J.C Hill, S.J Hillier, P.R Hobson, A Hocker, R.J Homer, A.K Honma, D Horváth, K.R Hossain, R Howard, P Hüntemeyer, D.E Hutchcroft, P Igo-Kemenes, D.C Imrie, K Ishii, A Jawahery, P.W Jeffreys, H Jeremie, M Jimack, A Joly, C.R Jones, M Jones, U Jost, P Jovanovic, T.R Junk, J Kanzaki, D Karlen, V Kartvelishvili, K Kawagoe, T Kawamoto, P.I Kayal, R.K Keeler, R.G Kellogg, B.W Kennedy, J Kirk, A Klier, S Kluth, T Kobayashi, M Kobel, D.S Koetke, T.P Kokott, M Kolrep, S Komamiya, R.V Kowalewski, T Kress, P Krieger, J von Krogh, P Kyberd, G.D Lafferty, R Lahmann, W.P Lai, D Lanske, J Lauber, S.R Lautenschlager, I Lawson, J.G Layter, D Lazic, A.M Lee, E Lefebvre, D Lellouch, J Letts, L Levinson, B List, S.L Lloyd, F.K Loebinger, G.D Long, M.J Losty, J Ludwig, D Lui, A Macchiolo, A Macpherson, M Mannelli, S Marcellini, C Markopoulos, C Markus, A.J Martin, J.P Martin, G Martinez, T Mashimo, P Mättig, W.J McDonald, J McKenna, E.A Mckigney, T.J McMahon, R.A McPherson, F Meijers, S Menke, F.S Merritt, H Mes, J Meyer, A Michelini, S Mihara, G Mikenberg, D.J Miller, A Mincer, R Mir, W Mohr, A Montanari, T Mori, K Nagai, I Nakamura, H.A Neal, B Nellen, R Nisius, S.W O'Neale, F.G Oakham, F Odorici, H.O Ogren, A Oh, N.J Oldershaw, M.J Oreglia, S Orito, J Pálinkás, G Pásztor, J.R Pater, G.N Patrick, J Patt, R Perez-Ochoa, S Petzold, P Pfeifenschneider, J.E Pilcher, J Pinfold, D.E Plane, P Poffenberger, B Poli, A Posthaus, C Rembser, S Robertson, S.A Robins, N Rodning, J.M Roney, A Rooke, A.M Rossi, P Routenburg, Y Rozen, K Runge, O Runolfsson, U Ruppel, D.R Rust, K Sachs, T Saeki, O Sahr, W.M Sang, E.K.G Sarkisyan, C Sbarra, A.D Schaile, O Schaile, F Scharf, P Scharff-Hansen, J Schieck, P Schleper, B Schmitt, S Schmitt, A Schöning, M Schröder, M Schumacher, C Schwick, W.G Scott, T.G Shears, B.C Shen, C.H Shepherd-Themistocleous, P Sherwood, G.P Siroli, A Sittler, A Skillman, A Skuja, A.M Smith, G.A Snow, R Sobie, S Söldner-Rembold, R.W Springer, M Sproston, K Stephens, J Steuerer, B Stockhausen, K Stoll, D Strom, R Ströhmer, P Szymanski, R Tafirout, S.D Talbot, P Taras, S Tarem, R Teuscher, M Thiergen, M.A Thomson, E von Törne, E Torrence, S Towers, I Trigger, Z Trócsányi, E Tsur, A.S Turcot, M.F Turner-Watson, I Ueda, P Utzat, R Van Kooten, P Vannerem, M Verzocchi, P Vikas, E.H Vokurka, H Voss, F Wäckerle, A Wagner, C.P Ward, D.R Ward, P.M Watkins, A.T Watson, N.K Watson, P.S Wells, N Wermes, J.S White, G.W Wilson, J.A Wilson, T.R Wyatt, S Yamashita, G Yekutieli, V Zacek, and D Zer-Zion
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Range (particle radiation), Muon, 010308 nuclear & particles physics, Detector, Scalar (mathematics), Charge (physics), 01 natural sciences, Electric charge, Charged particle, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Lepton
Abstract: A search for stable and long-lived massive particles of electric charge |Q/e| = 1 or 2/3, pair-produced in e+e- collisions at centre-of-mass energies from 130 to 183 GeV, is reported by the OPAL collaboration at LEP. No evidence for production of these particles was observed in a mass range between 45 and 89.5 GeV. Model-independent upper limits on the production cross-section between 0.05 and 0.19 pb have been derived for scalar and spin-1/2 particles with charge +/-1. Within the framework of the minimal supersymmetric model (MSSM), this implies a lower limit of 82.5 (83.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged leptons and charginos are excluded for masses below 89.5 GeV. For particles with charge +/-2/3 the upper limits on the production cross-section vary between 0.05 and 0.2 pb. All limits, on masses and on cross-sections, are valid at the 95% confidence level for particles with lifetimes longer than 10^{-6} s. A search for stable and long-lived massive particles of electric charge |Q/e| = 1 or 2/3, pair-produced in e+e- collisions at centre-of-mass energies from 130 to 183 GeV, is reported by the OPAL collaboration at LEP. No evidence for production of these particles was observed in a mass range between 45 and 89.5 GeV. Model-independent upper limits on the production cross-section between 0.05 and 0.19 pb have been derived for scalar and spin-1/2 particles with charge +/-1. Within the framework of the minimal supersymmetric model (MSSM), this implies a lower limit of 82.5 (83.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged leptons and charginos are excluded for masses below 89.5 GeV. For particles with charge +/-2/3 the upper limits on the production cross-section vary between 0.05 and 0.2 pb. All limits, on masses and on cross-sections, are valid at the 95% confidence level for particles with lifetimes longer than 10^{-6} s. A search for stable and long-lived massive particles of electric charge |Q/e| = 1 or 2/3, pair-produced in e+e- collisions at centre-of-mass energies from 130 to 183 GeV, is reported by the OPAL collaboration at LEP. No evidence for production of these particles was observed in a mass range between 45 and 89.5 GeV. Model-independent upper limits on the production cross-section between 0.05 and 0.19 pb have been derived for scalar and spin-1/2 particles with charge +/-1. Within the framework of the minimal supersymmetric model (MSSM), this implies a lower limit of 82.5 (83.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged leptons and charginos are excluded for masses below 89.5 GeV. For particles with charge +/-2/3 the upper limits on the production cross-section vary between 0.05 and 0.2 pb. All limits, on masses and on cross-sections, are valid at the 95% confidence level for particles with lifetimes longer than 10^{-6} s. A search for stable and long-lived massive particles of electric charge |Q/e| = 1 or 2/3, pair-produced in e+e- collisions at centre-of-mass energies from 130 to 183 GeV, is reported by the OPAL collaboration at LEP. No evidence for production of these particles was observed in a mass range between 45 and 89.5 GeV. Model-independent upper limits on the production cross-section between 0.05 and 0.19 pb have been derived for scalar and spin-1/2 particles with charge +/-1. Within the framework of the minimal supersymmetric model (MSSM), this implies a lower limit of 82.5 (83.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged leptons and charginos are excluded for masses below 89.5 GeV. For particles with charge +/-2/3 the upper limits on the production cross-section vary between 0.05 and 0.2 pb. All limits, on masses and on cross-sections, are valid at the 95% confidence level for particles with lifetimes longer than 10^{-6} s. A search for stable and long-lived massive particles of electric charge | Q / e |=1 or 2/3, pair-produced in e + e − collisions at centre-of-mass energies from 130 to 183 GeV, is reported by the OPAL collaboration at LEP. No evidence for production of these particles was observed in a mass range between 45 and 89.5 GeV. Model-independent upper limits on the production cross-section between 0.05 and 0.19 pb have been derived for scalar and spin-1/2 particles with charge ±1. Within the framework of the minimal supersymmetric model (MSSM), this implies a lower limit of 82.5 (83.5) GeV on the mass of long-lived right- (left-)handed scalar muons and scalar taus. Long-lived charged leptons and charginos are excluded for masses below 89.5 GeV. For particles with charge ±2/3 the upper limits on the production cross-section vary between 0.05 and 0.2 pb. All limits, on masses and on cross-sections, are valid at the 95% confidence level for particles with lifetimes longer than 10 −6 s.
Published: 1998

135. Search for charged Higgs bosons in e(+)e(-) collisions at root s = 130-172 GeV

Author: Silvia Arcelli, H. O. Ogren, Christoph Geich-Gimbel, J. Lauber, R. W. Springer, S. Baumann, E. A. Mckigney, Vakhtang Kartvelishvili, S. M. Gascon-Shotkin, K. Stoll, Andris Skuja, R. Davis, W. P. Lai, S. D. Talbot, S. Petzold, J. E. Conboy, A. Fürtjes, A. D. Schaile, W. R. Gibson, Gabriella Pasztor, P. Vannerem, D. Eatough, M. Schumacher, E. Lefebvre, E. Tsur, Tetsuro Mashimo, Lutz Feld, J. M. Roney, D. Lui, D. I. Futyan, F. Odorici, Matthew Evans, A. M. Rossi, G. A. Snow, C. P. Ward, M. Verzocchi, K. W. Bell, J. Pálinkás, C. Y. Chang, P. Taras, H. A. Neal, S. Söldner-Rembold, Michael Kobel, W. Gorn, S. Yamashita, J. C. Hill, P. Igo-Kemenes, K. Ishii, H. Jeremie, Richard Teuscher, O. Schaile, J. Grunhaus, Erez Etzion, S. Betts, M. Hapke, H. M. Fischer, Sven Menke, Dave Charlton, Stefan Kluth, M. A. Thomson, A. S. Turcot, E. K. U. Gross, Ehud Duchovni, Allen Mincer, F. Fiedler, Julie Kirk, P. G. Estabrooks, W. J. McDonald, B. C. Shen, Claire Shepherd-Themistocleous, R. K. Keeler, Shlomit Tarem, D. E. Hutchcroft, A. J. Martin, M. Boutemeur, F. S. Merritt, R. Bürgin, S. D. Bird, M. Jimack, M. Sproston, J. Letts, R. J. Hemingway, N. K. Watson, A. Michelini, Siegfried Bethke, B. W. Kennedy, L. Brigliadori, Sachio Komamiya, A. K. Honma, R. M. Brown, Lorne Levinson, M. J. Oreglia, P. Jovanovic, W. G. Scott, K. Sachs, Austin Ball, Theodoros Geralis, Daniel Lellouch, A. T. Watson, P. M. Watkins, I. Nakamura, D. Axen, A. Jawahery, Peter Krieger, Shlomo Dado, A. A. Faust, James Pinfold, R. Perez-Ochoa, Gideon Bella, M. Kolrep, H. J. Burckhart, S. A. Robins, T. Kobayashi, Takehiko Mori, D. G. Fong, H. Mes, I. P. Duerdoth, T. P. Kokott, J. Gascon, Alessandro Montanari, P. Mättig, S. Braibant, Jacqueline Batley, J. Bechtluft, T. Saeki, Peter Sherwood, K. Ackerstaff, U. Jost, R. Mir, R. Hawkings, C. K. Hargrove, V. Zacek, W. M. Sang, Alessandra Fanfani, Alexander Wagner, J. A. McKenna, A. Skillman, S. W. O'Neale, G. Azuelos, Tara Shears, Randall Sobie, G. D. Lafferty, Satoshi Mihara, T. Behnke, Giora Mikenberg, S. F. Ashby, K. J. Anderson, J. R. Carter, G. N. Patrick, J. W. Gary, N. I. Geddes, Michael Hildreth, D. Glenzinski, Dezso Horvath, D. S. Koetke, R. Kowalewski, M. J. Losty, J. Schieck, W. Mohr, Raimund Ströhmer, P. Hüntemeyer, Marcello Mannelli, C. R. Jones, J. Ludwig, P. A. Hart, K. Runge, P. Bock, Guenter Duckeck, N. L. Rodning, Jean-Arcady Meyer, F. G. Oakham, B. Schmitt, E. L. Barberio, A. Posthaus, B. Poli, P. Poffenberger, Otmar Biebel, P. Scharff-Hansen, I. J. Bloodworth, A. Macchiolo, A. Joly, C. Dallapiccola, J. Goldberg, Gideon Alexander, Paolo Capiluppi, C. M. Hawkes, S. B. Anderson, R. L. Coxe, P. Szymanski, B. Nellen, M. F. Turner-Watson, Peter R Hobson, N. Altekamp, H. Voss, A. M. Smith, P. Gagnon, R. J. Barlow, Beatrix Dienes, C. Sbarra, D. J. Miller, Yoram Rozen, F. Scharf, A. Hocker, Richard Nisius, K. Stephens, P. I. Kayal, D. Zer-Zion, Stan Bentvelsen, P. Routenburg, German Martinez, D. Chrisman, G. D. Long, B. List, M. Foucher, John Allison, Marco Cuffiani, Volker Blobel, H. G. Evans, M. Fierro, M. J. Goodrick, I. Cohen, A. Sittler, Peter Schleper, Junichi Kanzaki, D. Karlen, V. Gibson, Reda Tafirout, Klaus Kurt Desch, Zoltan Laszlo Trocsanyi, G. Yekutieli, Norbert Wermes, Sherry Towers, T. Kawamoto, Christoph Rembser, E. Torrence, Stefan Schmitt, S. Orito, R. G. Kellogg, Csaba Hajdu, P. E.L. Clarke, T. R. Junk, M. K. Jones, Stefano Marcellini, Stephen Lloyd, Shoji Asai, Ekg Sarkisyan, B. Stockhausen, Paul Kyberd, P. W. Jeffreys, J. P. Martin, F. K. Loebinger, I. Trigger, Matthias Schröder, J. Steuerer, Ivor Fleck, Joleen Pater, A. Klier, R. Giacomelli, D. R. Ward, A. Oh, T. Kress, S. De Jong, C. Hartmann, D. E. Plane, Stephen Hillier, U. Ruppel, G. M. Dallavalle, M. Thiergen, D. M. Gingrich, A. A. Carter, Ron Folman, Paolo Giacomelli, M. Hansroul, P. Vikas, D. Lanske, P. Utzat, S. R. Lautenschlager, A. Biguzzi, A. Rooke, C. Burgard, R. J. Homer, O. Runolfsson, J. G. Layter, Claudio Grandi, T. J. McMahon, O. C. Cooke, P. Pfeifenschneider, C. Couyoumtzelis, J. Patt, André Schöning, O. Sahr, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, R. Lahmann, D. C. Imrie, D. Lazic, Daniele Bonacorsi, G. P. Siroli, Christoph Schwick, J. von Krogh, G. G. Hanson, M. Gruwé, L. A. del Pozo, G. Giacomelli, I. Lawson, Kiyotomo Kawagoe, A. De Roeck, M. S. Dixit, Frans Meijers, K. R. Hossain, K. Nagai, D. R. Rust, A. M. Lee, E. von Törne, R. Van Kooten, F. Wäckerle, M. Fanti, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, A. Macpherson, R. Howard, J. S. White, Ikuo Ueda, D. M. Strom, P. S. Wells, Terry Richard Wyatt, N. J. Oldershaw, S. Robertson, Gregor Herten, J. E. Pilcher, G. W. Wilson, M. Hauschild, C. Markopoulos, C. Markus, E. H. Vokurka, and R. Bartoldus
Subjects: Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Microvertex Detector, FOS: Physical sciences, 01 natural sciences, 7. Clean energy, High-Energies, Lower limit, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Boson, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, High Energy Physics::Phenomenology, Monte-Carlo Program, LEP, Higgs boson, Couplings, High Energy Physics::Experiment, Decays, Cross-Sections, Particle Physics - Experiment
Abstract: A search is described to detect charged Higgs bosons via the process e^+e^- -> H^+H^-, using data collected by the OPAL detector at center-of-mass energies of 130-172 GeV with a total integrated luminosity of 25 pb^-1. The decay channels are assumed to be H^+ -> qq'(bar) and H^+ -> \tau^+ \nu_{\tau}. No evidence for charged Higgs boson production is observed. The lower limit for its mass is determined to be 52 GeV at 95% confidence level, independent of the H^+ -> \tau^+ \nu_{\tau} branching ratio., Comment: 19 pages, LaTeX, uses a4p.sty, 3 eps figures included, submitted to Phys. Lett. B
Published: 1998

136. First measurement of Z/gamma* production in Compton scattering of quasi-real photons

Author: K. Sachs, J. Goldberg, Shlomo Dado, Daniel Lellouch, Gideon Bella, J. Grunhaus, H. J. Burckhart, Giora Mikenberg, Jacqueline Batley, Stefan Schmitt, S. F. Ashby, B. Nellen, Shoji Asai, W. J. McDonald, B. C. Shen, S. D. Bird, Raimund Ströhmer, Otmar Biebel, Takehiko Mori, P. Mättig, H. A. Neal, Richard Teuscher, D. Axen, A. Jawahery, D. R. Rust, C. R. Jones, A. S. Turcot, F. Fiedler, A. D. Schaile, Gabriella Pasztor, H. G. Evans, G. Gaycken, I. J. Bloodworth, C. Hartmann, D. E. Plane, P. G. Bright-Thomas, I. Cohen, Peter Sherwood, Siegfried Bethke, P. I. Kayal, M. Schumacher, Stephen Hillier, Alexander Wagner, S. Yamashita, P. Vannerem, P. Igo-Kemenes, J. Ludwig, G. M. Dallavalle, K. Runge, M. A. Thomson, P. Poffenberger, P. Bock, Christoph Rembser, S. M. Gascon-Shotkin, F. Odorici, Yoram Rozen, E. K. U. Gross, K. Ishii, H. Jeremie, J. Letts, M. Sproston, P. Gagnon, Norbert Wermes, Sherry Towers, T. Kawamoto, J. Polok, Dave Charlton, G. A. Snow, C. P. Ward, D. Karlen, M. Fierro, R. Bartoldus, Beatrix Dienes, A. K. Honma, W. G. Scott, I. Nakamura, Erez Etzion, S. Orito, S. Söldner-Rembold, O. Schaile, A. Sittler, T. Seiler, R. Bürgin, Zoltan Laszlo Trocsanyi, M. Kolrep, Stefan Kluth, Ekg Sarkisyan, S. Betts, M. Hapke, S. Robertson, D. Liu, S. Baumann, Sachio Komamiya, Shlomit Tarem, A. T. Watson, W. R. Gibson, J. M. Roney, K. Harder, H. Mes, I. P. Duerdoth, Sven Menke, C. Y. Chang, J. Lauber, A. M. Rossi, E. A. Mckigney, S. Braibant, M. J. Oreglia, T. P. Kokott, S. D. Talbot, R. M. Brown, Lorne Levinson, Ehud Duchovni, Koichi Nagai, J. Schieck, W. Mohr, J. R. Carter, B. Surrow, T. Saeki, Christoph Geich-Gimbel, P. Taras, D. Glenzinski, S. A. Robins, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, P. Hüntemeyer, Stan Bentvelsen, H. O. Ogren, G. N. Patrick, Paul Kyberd, D. I. Futyan, F. K. Loebinger, L. Brigliadori, D. Lanske, K. Roscoe, S. R. Lautenschlager, R. Davis, R. Liebisch, K. Ackerstaff, S. W. O'Neale, K. J. Anderson, Klaus Kurt Desch, M. Jimack, P. G. Estabrooks, R. K. Keeler, O. Runolfsson, E. Torrence, E. Clay, Kiyotomo Kawagoe, N. K. Watson, Randall Sobie, G. D. Lafferty, F. Scharf, German Martinez, Claudia Ciocca, Claudio Grandi, J. S. White, J. Steuerer, Ivor Fleck, P. M. Watkins, Guenter Duckeck, Michael Hildreth, A. Michelini, Alain Bellerive, N. L. Rodning, S. Anderson, Joleen Pater, K. R. Hossain, Georges Azuelos, E. Tsur, A. Klier, D. C. Imrie, M. Verzocchi, K. W. Bell, J. Pálinkás, Satoshi Tanaka, T. Kobayashi, G. P. Siroli, J. C. Hill, Christoph Schwick, Vakhtang Kartvelishvili, R. L. Coxe, Satoshi Mihara, M. F. Turner-Watson, Peter R Hobson, J. E. Conboy, A. Fürtjes, A. Hocker, John Allison, D. Zer-Zion, D. Chrisman, G. D. Long, K. Stephens, Volker Blobel, C. Littlewood, R. G. Kellogg, V. Gibson, Stefano Marcellini, Stephen Lloyd, W. M. Sang, Paolo Giacomelli, M. Boutemeur, F. S. Merritt, M. Hansroul, I. Trigger, M. Fanti, C. Burgard, D. R. Ward, T. Kress, R. J. Homer, R. Kowalewski, S. Arcelli, T. R. Junk, C. Sbarra, Robert McPherson, F. R. Jacob, J. Bechtluft, Gideon Alexander, R. D. Heuer, A. W. Lloyd, P. S. Wells, Paolo Capiluppi, O. C. Cooke, J. A. McKenna, Fabrizio Fabbri, P. Pfeifenschneider, G. W. Wilson, M. Hauschild, C. Markopoulos, P. Scharff-Hansen, J. Patt, André Schöning, T. J. McMahon, C. Couyoumtzelis, J. Dubbert, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, J. Böhme, O. Sahr, D. Lazic, Terry Richard Wyatt, A. M. Lee, E. von Törne, Daniele Bonacorsi, A. M. Smith, J. von Krogh, F. Wäckerle, D. M. Gingrich, Achim Stahl, M. Gruwé, L. A. del Pozo, Gregor Herten, K. Stoll, A. J. Martin, G. Yekutieli, Andris Skuja, A. Macpherson, M. Przybycień, S. Petzold, W. Mader, C. K. Hargrove, J. E. Pilcher, Matthias Schröder, G. G. Hanson, A. A. Carter, Ron Folman, M. Thiergen, G. Giacomelli, I. Lawson, Tetsuro Mashimo, R. J. Hemingway, A. De Roeck, M. Kobel, R. Van Kooten, M. S. Dixit, Frans Meijers, Tara Shears, Giovanni Abbiendi, P. E.L. Clarke, B. W. Kennedy, J. P. Martin, P. Jovanovic, W. Gorn, S. De Jong, Austin Ball, Peter Krieger, R. Howard, H. Rick, Alessandro Montanari, A. Biguzzi, J. G. Layter, R. Mir, R. Hawkings, James Pinfold, D. M. Strom, R. Perez-Ochoa, R. Seuster, D. Eatough, T. Behnke, J. Gascon, V. Zacek, A. Macchiolo, J. W. Gary, F. G. Oakham, C. M. Hawkes, D. S. Koetke, Marcello Mannelli, B. Schmitt, E. L. Barberio, T. Kuhl, Richard Nisius, B. List, Marco Cuffiani, N. Altekamp, H. Voss, R. J. Barlow, D. J. Miller, Claire Shepherd-Themistocleous, and A. A. Faust
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, Branching fraction, Astrophysics::High Energy Astrophysical Phenomena, Hadron, Monte Carlo method, Compton scattering, FOS: Physical sciences, Electron, 7. Clean energy, 01 natural sciences, 3. Good health, High Energy Physics - Experiment, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Nuclear Experiment, Event (particle physics), Particle Physics - Experiment, Boson
Abstract: We report the first observation of Z/gamma* production in Compton scattering of quasi-real photons. This is a subprocess of the reaction e+e- to e+e-Z/gamma*, where one of the final state electrons is undetected. Approximately 55 pb-1 of data collected in the year 1997 at an e+e- centre-of-mass energy of 183 GeV with the OPAL detector at LEP have been analysed. The Z/gamma* from Compton scattering has been detected in the hadronic decay channel. Within well defined kinematic bounds, we measure the product of cross-section and Z/gamma* branching ratio to hadrons to be (0.9+-0.3+-0.1) pb for events with a hadronic mass larger than 60 GeV, dominated by (e)eZ production. In the hadronic mass region between 5 GeV and 60 GeV, dominated by (e)egamma* production, this product is found to be (4.1+-1.6+-0.6) pb. Our results agree with the predictions of two Monte Carlo event generators, grc4f and PYTHIA., Comment: 18 pages, LaTeX, 5 eps figures included, submitted to Physics Letters B
Published: 1998

137. Photon and light meson production in hadronic Z(0) decays

Author: Paul Kyberd, F. K. Loebinger, J. Steuerer, Ivor Fleck, Joleen Pater, A. Klier, R. Mir, John Allison, R. Hawkings, S. Yamashita, P. Igo-Kemenes, R. G. Kellogg, Stefano Marcellini, W. M. Sang, K. Ishii, H. Jeremie, A. Joly, C. Sbarra, F. R. Jacob, T. Behnke, James Pinfold, F. G. Oakham, R. Perez-Ochoa, R. Seuster, B. Schmitt, E. L. Barberio, O. Schaile, J. Gascon, A. Macchiolo, C. M. Hawkes, Otmar Biebel, R. J. Hemingway, P. E.L. Clarke, J. W. Gary, Sven Menke, J. P. Martin, M. F. Turner-Watson, Richard Nisius, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, D. S. Koetke, Peter R Hobson, Marcello Mannelli, D. Zer-Zion, S. De Jong, K. Stoll, Andris Skuja, B. List, P. I. Kayal, Marco Cuffiani, Alessandro Montanari, S. Petzold, H. Rick, Tetsuro Mashimo, J. Grunhaus, Georges Azuelos, E. Tsur, R. L. Coxe, N. Altekamp, H. Voss, Norbert Wermes, Sherry Towers, R. J. Barlow, S. B. Anderson, T. Kawamoto, J. Lauber, D. J. Miller, A. Hocker, M. Verzocchi, K. W. Bell, J. Pálinkás, S. D. Talbot, Sachio Komamiya, Theodoros Geralis, S. Orito, J. Goldberg, A. T. Watson, Claire Shepherd-Themistocleous, D. Chrisman, G. D. Long, Volker Blobel, W. Gorn, Stefan Schmitt, D. Eatough, J. C. Hill, W. J. McDonald, B. C. Shen, T. P. Kokott, O. C. Cooke, S. Betts, M. Hapke, G. W. Wilson, Stan Bentvelsen, J. Letts, P. Pfeifenschneider, T. Saeki, B. Nellen, Siegfried Bethke, A. K. Honma, Alessandra Fanfani, W. G. Scott, I. Nakamura, Stephen Lloyd, J. von Krogh, A. A. Faust, J. Patt, André Schöning, M. Przybzien, M. A. Thomson, S. D. Bird, M. Boutemeur, F. S. Merritt, G. G. Hanson, P. Scharff-Hansen, M. Gruwé, M. J. Oreglia, L. A. del Pozo, D. Axen, O. Sahr, A. Jawahery, J. Bechtluft, E. K. U. Gross, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Randall Sobie, K. Sachs, Shlomo Dado, J. A. McKenna, S. R. Lautenschlager, Ehud Duchovni, G. Yekutieli, Peter Sherwood, H. G. Evans, I. Cohen, Christoph Rembser, A. M. Smith, Alexander Wagner, M. Sproston, G. D. Lafferty, Tara Shears, G. Giacomelli, I. Lawson, J. Ludwig, M. Jimack, A. A. Carter, Ron Folman, K. Runge, P. Bock, J. R. Carter, G. N. Patrick, A. Michelini, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, Shoji Asai, P. Gagnon, Erez Etzion, A. De Roeck, Achim Stahl, R. Davis, P. G. Bright-Thomas, A. Sittler, Giora Mikenberg, S. F. Ashby, Kiyotomo Kawagoe, O. Runolfsson, Stefan Kluth, Guenter Duckeck, T. J. McMahon, Satoshi Tanaka, T. Kobayashi, M. Schumacher, Vakhtang Kartvelishvili, J. E. Conboy, Zoltan Laszlo Trocsanyi, Daniel Lellouch, Shlomit Tarem, E. Lefebvre, C. Couyoumtzelis, A. Fürtjes, J. Dubbert, R. K. Carnegie, M. S. Dixit, M. Herndon, Frans Meijers, Takehiko Mori, M. Bobinski, Richard Teuscher, A. S. Turcot, F. Fiedler, J. A. Wilson, J. Böhme, P. Mättig, F. Odorici, A. D. Schaile, Gabriella Pasztor, P. Vannerem, M. Kobel, A. Biguzzi, V. Zacek, H. A. Neal, S. A. Robins, D. Lui, D. Lazic, R. Liebisch, K. Ackerstaff, Claudio Grandi, R. Kowalewski, J. G. Layter, G. A. Snow, C. P. Ward, I. J. Bloodworth, M. Kolrep, T. Schorner, S. Söldner-Rembold, H. Mes, I. P. Duerdoth, Paolo Giacomelli, M. Hansroul, K. R. Hossain, Yoram Rozen, S. Braibant, P. Hüntemeyer, Gideon Alexander, J. Polok, Paolo Capiluppi, D. Karlen, C. Burgard, R. J. Homer, F. Scharf, German Martinez, M. Fierro, Ekg Sarkisyan, P. Vikas, D. Lanske, D. C. Imrie, G. P. Siroli, Christoph Schwick, Silvia Arcelli, J. Schieck, S. Baumann, W. Mohr, E. A. Mckigney, K. Stephens, C. Littlewood, J. M. Roney, K. Roscoe, D. I. Futyan, V. Gibson, T. R. Junk, P. G. Estabrooks, R. K. Keeler, N. K. Watson, I. Trigger, Reda Tafirout, Klaus Kurt Desch, P. M. Watkins, D. R. Ward, T. Kress, E. Torrence, E. Clay, Satoshi Mihara, Dave Charlton, R. Bürgin, Gideon Bella, H. J. Burckhart, Jacqueline Batley, W. R. Gibson, C. R. Jones, K. Nagai, D. R. Rust, A. M. Lee, E. von Törne, R. Van Kooten, R. M. Brown, Lorne Levinson, F. Wäckerle, D. M. Gingrich, M. Fanti, Robert McPherson, Mathieu Doucet, R. D. Heuer, Fabrizio Fabbri, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Michael Hildreth, N. L. Rodning, B. Poli, S. M. Gascon-Shotkin, A. M. Rossi, H. M. Fischer, Claudia Ciocca, P. S. Wells, Terry Richard Wyatt, A. Macpherson, R. Howard, J. S. White, D. M. Strom, C. Y. Chang, P. Taras, Raimund Ströhmer, P. Poffenberger, Beatrix Dienes, S. W. O'Neale, K. J. Anderson, A. W. Lloyd, M. Hauschild, C. Markopoulos, S. Robertson, Gregor Herten, J. E. Pilcher, A. J. Martin, C. K. Hargrove, Matthias Schröder, and M. Thiergen
Subjects: Physics, Line-Shape, Particle physics, Photon, Meson production, Jet Fragmentation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Inclusive Production, LEP, E+E-Physics, Detector, Lep, Omega, Nuclear physics, Lund Monte-Carlo, Production (computer science), Bose-Einstein Correlations, Z0 Decays, Engineering (miscellaneous), Energy (signal processing), Particle Physics - Experiment, Simulation
Abstract: The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models. The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, \eta, \rho(770)+-, \omega(782), \eta'(958) and a_0(980)+-. The particle multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models. The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, \eta, \rho(770)+-, \omega(782), \eta'(958) and a_0(980)+-. The particle multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models. The inclusive production rates and differential cross-sections of photons and mesons with a final state containing photons have been measured with the OPAL detector at LEP. The light mesons covered by the measurements are the \pi^0, \eta, \rho(770)+-, \omega(782), \eta'(958) and a_0(980)+-. The particle multiplicities per hadronic Z^0 decay, extrapolated to the full energy range, are: = 20.97 +/- 0.02 +/- 1.15, = 9.55 +/- 0.06 +/- 0.75, = 0.97 +/- 0.03 +/- 0.11, = 2.40 +/- 0.06 +/- 0.43, = 1.04 +/- 0.04 +/- 0.14, = 0.14 +/- 0.01 +/- 0.02, = 0.27 +/- 0.04 +/- 0.10. where the first errors are statistical and the second systematic. In general, the results are in agreement with the predictions of the JETSET and HERWIG Monte Carlo models.
Published: 1998

138. Search for a massive diphoton resonance at $\sqrt{s}$ = 91-172 GeV

Author: James Pinfold, R. Perez-Ochoa, D. G. Fong, Gunter Wolf, R. Bartoldus, K. Ackerstaff, Kiyotomo Kawagoe, J. Gascon, H. O. Ogren, V. Zacek, Christoph Geich-Gimbel, Satoshi Mihara, J. W. Gary, D. S. Koetke, Marcello Mannelli, K. R. Hossain, Matthias Schröder, S. Yamashita, P. Igo-Kemenes, Vakhtang Kartvelishvili, K. Ishii, H. Jeremie, S. Braibant, P. Scharff-Hansen, A. D. Schaile, J. Lauber, M. Thiergen, J. E. Conboy, T. Behnke, Gabriella Pasztor, J. Goldberg, A. Fürtjes, R. Lahmann, Dave Charlton, D. C. Imrie, R. W. Springer, O. Schaile, B. Nellen, Ehud Duchovni, E. do Couto e Silva, U. Ruppel, Daniele Bonacorsi, M. R. Ingram, I. J. Bloodworth, A. M. Smith, R. Bürgin, Silvia Arcelli, Georges Azuelos, E. Tsur, A. Macchiolo, G. P. Siroli, S. D. Talbot, M. Verzocchi, R. Davis, K. W. Bell, J. Pálinkás, J. C. Hill, Christoph Schwick, M. Jimack, M. Gruwé, C. M. Hawkes, H. G. Evans, M. Schumacher, E. Lefebvre, D. Eatough, A. Michelini, M. J. Goodrick, Hans-Christian Schultz-Coulon, Randall Sobie, I. Cohen, Sven Menke, Gideon Bella, K. Stoll, M. Boutemeur, F. S. Merritt, Andris Skuja, S. Petzold, F. Odorici, Yoram Rozen, M. Foucher, K. Stephens, G. D. Lafferty, Richard Nisius, J. von Krogh, H. J. Burckhart, Jacqueline Batley, C. Y. Chang, S. Baumann, U. Müller, Satoshi Tanaka, T. Kobayashi, Marco Cuffiani, S. D. Bird, Paolo Giacomelli, C. Dallapiccola, M. Hansroul, Tetsuro Mashimo, E. A. Mckigney, V. Gibson, A. J. Martin, D. Karlen, P. Schenk, T. R. Junk, C. R. Jones, J. Bechtluft, C. Burgard, W. P. Lai, Stefan Kluth, P. Taras, I. Trigger, L. A. del Pozo, D. Axen, Shlomit Tarem, J. A. McKenna, R. J. Homer, A. Jawahery, Michael Kobel, D. R. Ward, T. Kress, Stefan Schmitt, J. M. Roney, O. C. Cooke, Peter Sherwood, P. Pfeifenschneider, N. Altekamp, H. Voss, D. Chrisman, G. D. Long, Volker Blobel, Claire Shepherd-Themistocleous, H. Mes, R. J. Barlow, I. P. Duerdoth, W. Gorn, Guenter Duckeck, D. I. Futyan, W. J. McDonald, C. K. Hargrove, B. C. Shen, J. Patt, André Schöning, Siegfried Bethke, A. K. Honma, Alexander Wagner, W. G. Scott, I. Nakamura, D. M. Strom, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, G. Yekutieli, Allen Mincer, D. J. Miller, Julie Kirk, Tara Shears, J. Ludwig, K. Runge, P. Bock, P. Mättig, A. A. Faust, J. Schieck, Stephen Lloyd, Shoji Asai, A. A. Carter, P. A. Hart, Ron Folman, W. Mohr, P. Hüntemeyer, R. Rylko, Daniel Lellouch, D. Rigby, R. J. Hemingway, A. Posthaus, Takehiko Mori, M. J. Pearce, B. W. Kennedy, P. Jovanovic, P. Utzat, Austin Ball, P. Poffenberger, Peter Krieger, S. B. Anderson, P. Szymanski, Alessandro Montanari, P. Gagnon, U. Jost, R. Mir, R. Hawkings, T. J. McMahon, F. G. Oakham, B. Schmitt, R. K. Carnegie, D. L. Rees, E. L. Barberio, M. Herndon, M. Bobinski, J. A. Wilson, Beatrix Dienes, Gideon Alexander, Paolo Capiluppi, Reda Tafirout, Klaus Kurt Desch, L. Brigliadori, F. Scharf, D. Lazic, A. Sittler, German Martinez, Stan Bentvelsen, Peter Schleper, S. W. O'Neale, K. J. Anderson, Zoltan Laszlo Trocsanyi, M. A. Thomson, E. K. U. Gross, Richard Teuscher, M. Sproston, A. S. Turcot, F. Fiedler, M. Kolrep, W. R. Gibson, B. T. Bouwens, R. M. Brown, Lorne Levinson, A. Skillman, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, B. Stockhausen, Paul Kyberd, F. K. Loebinger, J. Steuerer, Ivor Fleck, Joleen Pater, A. Klier, R. Giacomelli, A. Oh, H. M. Fischer, N. I. Geddes, Michael Hildreth, N. L. Rodning, R. Van Kooten, B. Poli, S. M. Gascon-Shotkin, F. Wäckerle, D. M. Gingrich, Matthew Evans, A. M. Rossi, M. Fierro, J. E.G. Edwards, S. R. Lautenschlager, H. A. Neal, A. Joly, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. Zer-Zion, P. Routenburg, O. Runolfsson, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, K. Nagai, T. P. Kokott, T. Saeki, C. Beeston, Claudio Grandi, Ekg Sarkisyan, D. R. Rust, C. Sbarra, J. Grunhaus, P. W. Jeffreys, A. M. Lee, E. von Törne, P. Vikas, D. Lanske, John Allison, M. Fanti, P. G. Estabrooks, R. K. Keeler, N. K. Watson, P. M. Watkins, R. G. Kellogg, Robert McPherson, Csaba Hajdu, Mathieu Doucet, R. D. Heuer, Stefano Marcellini, Fabrizio Fabbri, G. A. Snow, C. P. Ward, S. Söldner-Rembold, P. S. Wells, Terry Richard Wyatt, J. E. Bloomer, A. Macpherson, J. Letts, K. Sachs, Shlomo Dado, Giora Mikenberg, R. Howard, J. S. White, S. Robertson, Gregor Herten, B. Wilkens, J. E. Pilcher, N. J. Oldershaw, G. W. Wilson, M. Hauschild, C. Markus, G. T. Jones, E. H. Vokurka, M. Hapke, D. E. Hutchcroft, M. J. Oreglia, J. R. Carter, G. N. Patrick, Otmar Biebel, P. I. Kayal, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, A. N. Bell, G. G. Hanson, G. Giacomelli, M. S. Dixit, Frans Meijers, A. Biguzzi, A. Rooke, J. G. Layter, and S. A. Robins
Subjects: Physics, Particle physics, Gauge boson, Photon, Physics and Astronomy (miscellaneous), Scalar (mathematics), Hadron, High Energy Physics::Phenomenology, Expected value, Resonance (particle physics), Standard Model, Nuclear physics, Higgs boson, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a total data sample of 25.7 pb^-1 taken at centre-of-mass energies between 130 GeV and 172 GeV with the OPAL detector at LEP. The observed number of events is consistent with the expected number from Standard Model processes. The observed candidates are combined with search results from sqrt{s} ~ M_Z to place limits on Br(H^0 -> gamma gamma) within the Standard Model for Higgs boson masses up to 77 GeV, and on the production cross section of any scalar resonance decaying into di-photons. Upper limits on Br(H^0 -> gamma gamma) x sigma(e^+e^- -> H^0 Z^0) of 290 - 830 fb are obtained over 40 < M_H < 160 GeV. Type-I two-Higgs-doublet scalars which couple only to gauge bosons are ruled out up to a mass of 76.5 GeV at the 95% confidence level. A search for the resonant production of high mass photon pairs associated with a leptonic or hadronic system has been performed using a total data sample of 25.7 pb^-1 taken at centre-of-mass energies between 130 GeV and 172 GeV with the OPAL detector at LEP. The observed number of events is consistent with the expected number from Standard Model processes. The observed candidates are combined with search results from sqrt{s} ~ M_Z to place limits on Br(H^0 -> gamma gamma) within the Standard Model for Higgs boson masses up to 77 GeV, and on the production cross section of any scalar resonance decaying into di-photons. Upper limits on Br(H^0 -> gamma gamma) x sigma(e^+e^- -> H^0 Z^0) of 290 - 830 fb are obtained over 40 < M_H < 160 GeV. Type-I two-Higgs-doublet scalars which couple only to gauge bosons are ruled out up to a mass of 76.5 GeV at the 95% confidence level.
Published: 1997

139. Measurement of the Photon Structure Function F_2^gamma at Low x

Author: K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, T. Barillari, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, C. Beeston, T. Behnke, A.N. Bell, K.W. Bell, G. Bella, S. Bentvelsen, S. Bethke, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, J.E. Bloomer, M. Bobinski, P. Bock, D. Bonacorsi, M. Boutemeur, B.T. Bouwens, S. Braibant, L. Brigliadori, R.M. Brown, H.J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, P.E.L. Clarke, I. Cohen, J.E. Conboy, O.C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola, G.M. Dallavalle, R. Davies, S. De Jong, L.A. del Pozo, K. Desch, B. Dienes, M.S. Dixit, E. do Couto e Silva, M. Doucet, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, J.E.G. Edwards, P.G. Estabrooks, H.G. Evans, M. Evans, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, H.M. Fischer, I. Fleck, R. Folman, D.G. Fong, M. Foucher, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, N.I. Geddes, C. Geich-Gimbel, T. Geralis, G. Giacomelli, P. Giacomelli, R. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, M.J. Goodrick, W. Gorn, C. Grandi, E. Gross, J. Grunhaus, M. Gruwé, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, C.K. Hargrove, P.A. Hart, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, S.J. Hillier, P.R. Hobson, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, D.E. Hutchcroft, P. Igo-Kemenes, D.C. Imrie, M.R. Ingram, K. Ishii, A. Jawahery, P.W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, C.R. Jones, G. Jones, M. Jones, U. Jost, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, J. Kirk, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G.D. Lafferty, R. Lahmann, W.P. Lai, D. Lanske, J. Lauber, S.R. Lautenschlager, J.G. Layter, D. Lazic, A.M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, A. Macchiolo, A. Macpherson, M. Mannelli, S. Marcellini, C. Markus, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, G. Mikenberg, D.J. Miller, A. Mincer, R. Mir, W. Mohr, A. Montanari, T. Mori, M. Morii, U. Müller, S. Mihara, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Oh, N.J. Oldershaw, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, M.J. Pearce, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, B. Poli, A. Posthaus, D.L. Rees, D. Rigby, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, A. Rooke, E. Ros, A.M. Rossi, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, U. Ruppel, D.R. Rust, R. Rylko, K. Sachs, T. Saeki, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, P. Schenk, J. Schieck, P. Schleper, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, H.C. Schultz-Coulon, M. Schumacher, C. Schwick, W.G. Scott, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skillman, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, R.W. Springer, M. Sproston, K. Stephens, J. Steuerer, B. Stockhausen, K. Stoll, D. Strom, P. Szymanski, R. Tafirout, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, M.A. Thomson, E. von Törne, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, P. Utzat, R. Van Kooten, M. Verzocchi, P. Vikas, E.H. Vokurka, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, B. Wilkens, G.W. Wilson, J.A. Wilson, G. Wolf, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Nuclear and High Energy Physics, Particle physics, Logarithm, FOS: Physical sciences, Generator, 01 natural sciences, Q2, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, 010306 general physics, Physics, Range (particle radiation), Luminosity (scattering theory), Parton Distributions, 010308 nuclear & particles physics, Scattering, Detector, Virtual Photons, LEP, Beam electron, Photon structure function, High Energy Physics::Experiment, Atomic physics, Particle Physics - Experiment
Abstract: Deep inelastic electron-photon scattering is studied using e+e- data collected by the OPAL detector at centre-of-mass energies sqrt{s_ee} ~ M_{Z^0}. The photon structure function F_2^gamma(x,Q^2) is explored in a Q^2 range of 1.1 to 6.6 GeV/c^2 at lower x values than ever before. To probe this kinematic region events are selected with a beam electron scattered into one of the OPAL luminosity calorimeters at scattering angles between 27 and 55 mrad. A measurement is presented of the photon structure function F_2^gamma(x,Q^2) at = 1.86 GeV^2 and 3.76 GeV^2 in five logarithmic x bins from 0.0025 to 0.2., Comment: 13 pages, LaTeX, uses a4p.sty, 3 eps figures included, submitted to Phys. Lett. B
Published: 1997

140. Multiplicity distributions of gluon and quark jets and tests of QCD analytic predictions

Author: Gunter Wolf, K. Ackerstaff, P. G. Estabrooks, Sachio Komamiya, Theodoros Geralis, E. Ros, N. K. Watson, T. P. Kokott, M. Fierro, J. E.G. Edwards, P. M. Watkins, J. Goldberg, B. Nellen, T. Saeki, Otmar Biebel, Ekg Sarkisyan, P. W. Jeffreys, R. Bartoldus, H. G. Evans, Daniele Bonacorsi, Stefan Kluth, Shlomit Tarem, M. J. Goodrick, I. Cohen, H. O. Ogren, Christoph Geich-Gimbel, P. E.L. Clarke, M. K. Jones, R. Davis, R. Van Kooten, S. M. Gascon-Shotkin, P. S. Wells, W. J. McDonald, B. C. Shen, J. Lauber, Satoshi Mihara, Silvia Arcelli, J. P. Martin, P. Vikas, Terry Richard Wyatt, J. E. Bloomer, D. Lanske, Matthew Evans, J. Letts, M. Schumacher, E. Lefebvre, F. Odorici, S. R. Lautenschlager, P. I. Kayal, Siegfried Bethke, A. K. Honma, J. von Krogh, W. G. Scott, I. Nakamura, H. A. Neal, W. R. Gibson, A. M. Rossi, S. Baumann, S. De Jong, A. Macpherson, Vakhtang Kartvelishvili, J. E. Conboy, A. Fürtjes, N. J. Oldershaw, Richard Keeler, James Pinfold, R. Perez-Ochoa, E. A. Mckigney, B. T. Bouwens, S. Yamashita, T. Behnke, O. Runolfsson, P. Igo-Kemenes, Norbert Wermes, Sherry Towers, D. G. Fong, J. Gascon, R. M. Brown, Lorne Levinson, N. I. Geddes, Michael Hildreth, L. A. del Pozo, D. Glenzinski, A. Macchiolo, T. Kawamoto, R. Howard, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, W. P. Lai, J. S. White, F. Wäckerle, C. Beeston, Claudio Grandi, H. Mes, I. P. Duerdoth, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. Zer-Zion, S. D. Talbot, M. Boutemeur, F. S. Merritt, A. N. Bell, P. Routenburg, C. Dallapiccola, A. Joly, A. Skillman, N. L. Rodning, B. Poli, K. Sachs, Shlomo Dado, M. Gruwé, C. M. Hawkes, S. Orito, Richard Nisius, D. M. Gingrich, J. W. Gary, D. S. Koetke, J. Bechtluft, T. J. McMahon, Ehud Duchovni, D. Eatough, P. Poffenberger, J. A. McKenna, U. Ruppel, M. R. Ingram, I. J. Bloodworth, K. Ishii, H. Jeremie, R. K. Carnegie, M. Hapke, Marcello Mannelli, M. Jimack, R. W. Springer, J. Grunhaus, M. Herndon, C. Sbarra, Marco Cuffiani, H. M. Fischer, J. M. Roney, N. Altekamp, H. Voss, D. E. Hutchcroft, Gideon Bella, H. J. Burckhart, Jacqueline Batley, Kiyotomo Kawagoe, P. Hüntemeyer, P. Scharff-Hansen, K. Nagai, M. Bobinski, J. A. Wilson, A. Michelini, G. G. Hanson, Reda Tafirout, Klaus Kurt Desch, R. J. Barlow, S. D. Bird, D. M. Strom, P. Schenk, D. R. Rust, O. Schaile, M. J. Oreglia, D. I. Futyan, Georges Azuelos, E. Tsur, G. Giacomelli, Paolo Giacomelli, D. J. Miller, Claire Shepherd-Themistocleous, G. W. Wilson, E. do Couto e Silva, A. M. Smith, M. Verzocchi, M. Hansroul, K. W. Bell, J. Pálinkás, D. Axen, John Allison, A. Jawahery, M. Hauschild, Satoshi Tanaka, T. Kobayashi, R. Rylko, Giora Mikenberg, J. C. Hill, D. Lazic, J. R. Carter, C. Markus, K. Stoll, Andris Skuja, G. N. Patrick, S. Petzold, C. Hartmann, D. E. Plane, A. M. Lee, M. S. Dixit, Peter Sherwood, Frans Meijers, A. A. Faust, Stephen Hillier, E. von Törne, Tetsuro Mashimo, C. R. Jones, Alexander Wagner, G. M. Dallavalle, Sven Menke, G. T. Jones, K. Stephens, S. Braibant, J. Ludwig, K. Runge, P. Bock, E. H. Vokurka, C. Burgard, A. D. Schaile, G. Yekutieli, Gabriella Pasztor, Alan Watson, W. Gorn, A. Biguzzi, S. B. Anderson, R. G. Kellogg, P. Szymanski, A. Rooke, J. G. Layter, A. A. Carter, Ron Folman, P. Gagnon, Dave Charlton, S. Robertson, Csaba Hajdu, Gregor Herten, D. Rigby, R. J. Hemingway, R. J. Homer, G. A. Snow, C. P. Ward, P. Utzat, V. Gibson, R. Bürgin, B. Wilkens, A. Sittler, Stefano Marcellini, Peter Schleper, Zoltan Laszlo Trocsanyi, J. E. Pilcher, M. Fanti, S. Söldner-Rembold, B. W. Kennedy, P. Jovanovic, Austin Ball, T. R. Junk, Peter Krieger, I. Trigger, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Gideon Alexander, D. R. Ward, Paolo Capiluppi, J. Steuerer, Ivor Fleck, T. Kress, Alessandro Montanari, K. R. Hossain, Joleen Pater, Robert McPherson, O. C. Cooke, A. Klier, U. Jost, R. Mir, R. Giacomelli, P. Pfeifenschneider, D. Chrisman, G. D. Long, Yoram Rozen, R. Hawkings, A. Oh, Volker Blobel, Mathieu Doucet, Stephen Lloyd, R. Lahmann, D. C. Imrie, J. Patt, R. D. Heuer, André Schöning, Fabrizio Fabbri, F. G. Oakham, Stan Bentvelsen, B. Schmitt, E. L. Barberio, G. P. Siroli, Christoph Schwick, M. Foucher, Hans-Christian Schultz-Coulon, Randall Sobie, G. D. Lafferty, Guenter Duckeck, Richard Teuscher, A. S. Turcot, F. Fiedler, D. Karlen, M. Kolrep, Stefan Schmitt, Beatrix Dienes, P. Mättig, C. Y. Chang, Shoji Asai, P. Taras, Daniel Lellouch, Michael Kobel, Allen Mincer, Julie Kirk, Takehiko Mori, L. Brigliadori, S. W. O'Neale, K. J. Anderson, V. Zacek, Tara Shears, P. A. Hart, M. J. Pearce, U. Müller, A. J. Martin, C. K. Hargrove, Matthias Schröder, M. Thiergen, J. Schieck, W. Mohr, A. Posthaus, M. A. Thomson, E. K. U. Gross, M. Sproston, D. L. Rees, F. Scharf, German Martinez, and S. A. Robins
Subjects: Quark, Particle physics, E+E ANNIHILATION, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Astrophysics::High Energy Astrophysical Phenomena, High Energy Physics::Lattice, Hadron, Nuclear Theory, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, CUMULANT MOMENTS, 010306 general physics, Engineering (miscellaneous), NON-LEADING TERMS, Quantum chromodynamics, Physics, Annihilation, OPAL, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, LEP, FLUCTUATIONS, MICROVERTEX DETECTOR, Charged particle, Gluon, FACTORIAL, Kurtosis, High Energy Physics::Experiment, HADRON DISTRIBUTIONS, Particle Physics - Experiment, AVERAGE MULTIPLICITIES
Abstract: Gluon jets are identified in e+e- hadronic annihilation events by tagging two quark jets in the same hemisphere of an event. The gluon jet is defined inclusively as all the particles in the opposite hemisphere. Gluon jets defined in this manner have a close correspondence to gluon jets as they are defined for analytic calculations, and are almost independent of a jet finding algorithm. The charged particle multiplicity distribution of the gluon jets is presented, and is analyzed for its mean, dispersion, skew, and curtosis values, and for its factorial and cumulant moments. The results are compared to the analogous results found for a sample of light quark (uds) jets, also defined inclusively. We observe differences between the mean, skew and curtosis values of gluon and quark jets, but not between their dispersions. The cumulant moment results are compared to the predictions of QCD analytic calculations. A calculation which includes next-to-next-to-leading order corrections and energy conservation is observed to provide a much improved description of the data compared to a next-to-leading order calculation without energy conservation. There is agreement between the data and calculations for the ratios of the cumulant moments between gluon and quark jets., 32 pages, LaTeX, uses a4p.sty, 9 eps figures included (plus in colour), submitted to Zeit. Phys. C
Published: 1997

141. Spin alignment of leading $K^{*}(892)^{0}$ mesons in hadronic $Z^0$ decays

Author: K. Ackerstaff, G. Alexander, J. Allison, N. Altekamp, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, T. Barillari, R.J. Barlow, R. Bartoldus, J.R. Batley, S. Baumann, J. Bechtluft, C. Beeston, T. Behnke, A.N. Bell, K.W. Bell, G. Bella, S. Bentvelsen, S. Bethke, O. Biebel, A. Biguzzi, S.D. Bird, V. Blobel, I.J. Bloodworth, J.E. Bloomer, M. Bobinski, P. Bock, D. Bonacorsi, M. Boutemeur, B.T. Bouwens, S. Braibant, L. Brigliadori, R.M. Brown, H.J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, D.G. Charlton, D. Chrisman, P.E.L. Clarke, I. Cohen, J.E. Conboy, O.C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola, G.M. Dallavalle, R. Davis, S. De Jong, L.A. del Pozo, K. Desch, B. Dienes, M.S. Dixit, E. do Couto e Silva, M. Doucet, E. Duchovni, G. Duckeck, I.P. Duerdoth, D. Eatough, J.E.G. Edwards, P.G. Estabrooks, H.G. Evans, M. Evans, F. Fabbri, M. Fanti, A.A. Faust, F. Fiedler, M. Fierro, H.M. Fischer, I. Fleck, R. Folman, D.G. Fong, M. Foucher, A. Fürtjes, D.I. Futyan, P. Gagnon, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, N.I. Geddes, C. Geich-Gimbel, T. Geralis, G. Giacomelli, P. Giacomelli, R. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, D. Glenzinski, J. Goldberg, M.J. Goodrick, W. Gorn, C. Grandi, E. Gross, J. Grunhaus, M. Gruwé, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, C.K. Hargrove, P.A. Hart, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, M. Herndon, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, S.J. Hillier, P.R. Hobson, R.J. Homer, A.K. Honma, D. Horváth, K.R. Hossain, R. Howard, P. Hüntemeyer, D.E. Hutchroft, P. Igo-Kemenes, D.C. Imrie, M.R. Ingram, K. Ishii, A. Jawahery, P.W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, C.R. Jones, G. Jones, M. Jones, U. Jost, P. Jovanovic, T.R. Junk, D. Karlen, V. Kartvelishvili, K. Kawagoe, T. Kawamoto, P.I. Kayal, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, J. Kirk, A. Klier, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, M. Kolrep, S. Komamiya, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G.D. Lafferty, R. Lahmann, W.P. Lai, D. Lanske, J. Lauber, S.R. Lautenschlager, J.G. Layter, D. Lazic, A.M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, S.L. Lloyd, F.K. Loebinger, G.D. Long, M.J. Losty, J. Ludwig, A. Macchiolo, A. Macpherson, M. Mannelli, S. Marcellini, C. Markus, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, R.A. McPherson, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, G. Mikenberg, D.J. Miller, A. Mincer, R. Mir, W. Mohr, A. Montanari, T. Mori, M. Morii, U. Müller, S. Mihara, K. Nagai, I. Nakamura, H.A. Neal, B. Nellen, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, A. Oh, N.J. Oldershaw, M.J. Oreglia, S. Orito, J. Pálinkás, G. Pásztor, J.R. Pater, G.N. Patrick, J. Patt, M.J. Pearce, R. Perez-Ochoa, S. Petzold, P. Pfeifenschneider, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, B. Poli, A. Posthaus, D.L. Rees, D. Rigby, S. Robertson, S.A. Robins, N. Rodning, J.M. Roney, A. Rooke, E. Ros, A.M. Rossi, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, U. Ruppel, D.R. Rust, R. Rylko, K. Sachs, T. Saeki, E.K.G. Sarkisyan, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, P. Schenk, J. Schieck, P. Schleper, B. Schmitt, S. Schmitt, A. Schöning, M. Schröder, H.C. Schultz-Coulon, M. Schumacher, C. Schwick, W.G. Scott, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skillman, A. Skuja, A.M. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, R.W. Springer, M. Sproston, K. Stephens, J. Steuerer, B. Stockhausen, K. Stoll, D. Strom, P. Szymanski, R. Tafirout, S.D. Talbot, S. Tanaka, P. Taras, S. Tarem, R. Teuscher, M. Thiergen, M.A. Thomson, E. von Törne, S. Towers, I. Trigger, Z. Trócsányi, E. Tsur, A.S. Turcot, M.F. Turner-Watson, P. Utzat, R. Van Kooten, M. Verzocchi, P. Vikas, E.H. Vokurka, H. Voss, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P.S. Wells, N. Wermes, J.S. White, B. Wilkens, G.W. Wilson, J.A. Wilson, G. Wolf, T.R. Wyatt, S. Yamashita, G. Yekutieli, V. Zacek, and D. Zer-Zion
Subjects: Density matrix, Physics, Nuclear and High Energy Physics, Particle physics, Meson, 010308 nuclear & particles physics, Hadron, FOS: Physical sciences, 01 natural sciences, Helicity, High Energy Physics - Experiment, Standard Model, Momentum, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Particle Physics - Experiment, Spin-½, Bar (unit)
Abstract: Helicity density matrix elements for inclusive K*(892)^0 mesons from hadronic Z^0 decays have been measured over the full range of K^*0 momentum using data taken with the OPAL experiment at LEP. A preference for occupation of the helicity zero state is observed at all scaled momentum x_p values above 0.3, with the matrix element rho_00 rising to 0.66 +/- 0.11 for x_p > 0.7. The values of the real part of the off-diagonal element rho_1-1 are negative at large x_p, with a weighted average value of -0.09 +/- 0.03 for x_p > 0.3, in agreement with new theoretical predictions based on Standard Model parameters and coherent fragmentation of the qq(bar) system from the Z^0 decay. All other helicity density matrix elements measured are consistent with zero over the entire x_p range. The K^*0 fragmentation function has also been measured and the total rate determined to be 0.74 +/- 0.02 +/- 0.02 K*(892)^0 mesons per hadronic Z^0 decay., 19 pages, LaTeX, uses a4p.sty, pennames.sty, 4 eps figures included, submitted to Phys. Lett. B
Published: 1997

142. A measurement of the hadronic decay current and the $\nu_{\tau}$-helicity in $\tau^- \to \pi^- \pi^- \pi^+ \nu_{\tau}$

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

143. Measurement of the Semileptonic Branching Fraction of Inclusive b Baryon Decays to $\Lambda$

Author: K. Stephens, John Allison, R. G. Kellogg, M. Steiert, Csaba Hajdu, Stefano Marcellini, A. Joly, S. R. Lautenschlager, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Silvia Arcelli, J. Steuerer, Joleen Pater, H. A. Neal, T. Hilse, R. Giacomelli, T. J. McMahon, R. W. Springer, P. Scharff-Hansen, Gideon Bella, N. I. Geddes, O. Runolfsson, M. Boutemeur, F. S. Merritt, U. Jost, R. Mir, V. Gibson, T. R. Junk, S. Braibant, R. Lahmann, N. J. Oldershaw, H. J. Burckhart, P. Poffenberger, A. Rooke, I. Trigger, Tara Shears, D. C. Imrie, P. Gagnon, Jacqueline Batley, A. D. Schaile, Gabriella Pasztor, A. I. McNab, J. G. Layter, Michael Hildreth, Robert McPherson, C. Beeston, D. R. Ward, T. Kress, E. A. Mckigney, P. Schütz, J. Goldberg, D. M. Strom, Claudio Grandi, Georges Azuelos, H. Mes, N. L. Rodning, I. P. Duerdoth, W. P. Lai, S. Yamashita, E. Tsur, W. R. Gibson, Mathieu Doucet, U. Ruppel, M. R. Ingram, J. Grunhaus, P. Igo-Kemenes, M. Verzocchi, K. W. Bell, B. Nellen, F. G. Oakham, P. A. Hart, B. Poli, T. Behnke, G. P. Siroli, A. M. Smith, T. Omori, R. K. Carnegie, R. D. Heuer, K. Ishii, H. Jeremie, Fabrizio Fabbri, J. Bechtluft, J. Pálinkás, B. Schmitt, C. Y. Chang, R. Rylko, E. L. Barberio, A. Sittler, J. A. McKenna, J. C. Hill, Misao Sasaki, M. Hapke, W. J. McDonald, B. C. Shen, S. Robertson, M. Herndon, Gregor Herten, K. Ametewee, P. Taras, J. M. Roney, Michael Kobel, Siegfried Bethke, D. E. Hutchcroft, A. K. Honma, B. Nijjhar, W. G. Scott, C. R. Jones, G. Vasseur, R. E. Hughes-Jones, I. Nakamura, B. Wilkens, D. Rigby, R. J. Hemingway, J. E. Pilcher, G. A. Snow, Gideon Alexander, C. P. Ward, Paolo Capiluppi, M. J. Pearce, M. Schumacher, E. Lefebvre, G. W. Wilson, M. Hauschild, K. Nagai, P. Schenk, B. W. Kennedy, S. A. Wotton, Stefan Schmitt, Julie Kirk, M. J. Oreglia, P. Jovanovic, H. M. Fischer, S. Söldner-Rembold, C. Markus, M. Bobinski, B. T. Bouwens, F. Odorici, G. T. Jones, Austin Ball, Peter Krieger, S. Petzold, G. D. Long, J. R. Carter, G. N. Patrick, G. G. Hanson, M. F. Turner-Watson, H. G. Evans, E. H. Vokurka, J. A. Wilson, D. Glenzinski, Dezso Horvath, M. J. Losty, D. R. Rust, S. B. Anderson, P. Szymanski, M. Gruwé, Jean-Arcady Meyer, R. M. Brown, Tetsuro Mashimo, Manuella Vincter, Alessandro Montanari, P. S. Wells, Dave Charlton, M. Morii, Otmar Biebel, Lorne Levinson, C. M. Hawkes, Peter R Hobson, Ehud Duchovni, P. G. Estabrooks, O. Schaile, R. K. Keeler, C. Dallapiccola, Terry Richard Wyatt, A. Skillman, P. Routenburg, M. J. Goodrick, J. E. Bloomer, Kiyotomo Kawagoe, Sachio Komamiya, K. Sachs, G. Giacomelli, Theodoros Geralis, I. Cohen, E. do Couto e Silva, M. Jimack, A. M. Lee, D. Lazic, Shlomo Dado, E. Ros, A. T. Watson, J. Letts, C. Hartmann, D. E. Plane, N. Altekamp, R. Bürgin, W. Gorn, Norbert Wermes, Sherry Towers, A. Michelini, T. Kawamoto, S. A. Robins, C. Sbarra, E. von Törne, Stephen Hillier, R. J. Barlow, G. M. Dallavalle, S. W. O'Neale, M. S. Dixit, H. Lafoux, K. J. Anderson, Frans Meijers, Richard Nisius, Stan Bentvelsen, S. Orito, M. Rosvick, D. J. Miller, T. P. Kokott, Sven Menke, P. E.L. Clarke, G. Yekutieli, M. K. Jones, P. M. Watkins, Giora Mikenberg, J. P. Martin, A. A. Carter, Ron Folman, James Pinfold, Roger Jones, Satoshi Tanaka, T. Kobayashi, R. Van Kooten, D. G. Fong, C. Lewis, P. Mättig, Shoji Asai, J. Gascon, S. M. Gascon-Shotkin, U. Müller, S. De Jong, Marco Cuffiani, Stefan Kluth, Reda Tafirout, Klaus Kurt Desch, Shlomit Tarem, B. J. King, P. Utzat, R. Howard, J. S. White, A. J. Martin, H. Przysiezniak, F. X. Gentil, A. N. Bell, O. C. Cooke, Matthew Evans, A. M. Rossi, A. Biguzzi, T. Tsukamoto, J. W. Gary, Daniel Lellouch, D. Chrisman, D. S. Koetke, Claire Shepherd-Themistocleous, Volker Blobel, Gunter Wolf, K. Ackerstaff, F. Wäckerle, Marcello Mannelli, Stephen Lloyd, Hans-Christian Schultz-Coulon, Takehiko Mori, D. M. Gingrich, J. von Krogh, Randall Sobie, Michael Schulz, G. D. Lafferty, R. J. Hawkings, L. A. del Pozo, V. Zacek, P. Berlich, I. J. Bloodworth, Yoram Rozen, P. Path, M. Foucher, Guenter Duckeck, D. Karlen, A. S. Turcot, F. Fiedler, M. Fierro, J. E.G. Edwards, A. Malik, Ekg Sarkisyan, P. W. Jeffreys, R. Bartoldus, H. M. Bosch, J. J. Ward, P. Vikas, D. Lanske, J. Lauber, F. Strumia, S. D. Talbot, H. O. Ogren, M. Kolrep, Christoph Geich-Gimbel, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, Achim Stahl, J. Ludwig, K. Runge, P. Bock, J. E. Conboy, A. Fürtjes, P. Pfeifenschneider, J. Patt, Paolo Giacomelli, M. Hansroul, C. Burgard, R. J. Homer, C. K. Hargrove, Matthias Schröder, M. Thiergen, N. K. Watson, W. Mohr, A. Posthaus, W. Matthews, M. A. Thomson, E. K. U. Gross, A. Gaidot, M. Sproston, D. L. Rees, A. Skuja, F. Scharf, German Martinez, and T. J. Smith
Subjects: Nuclear physics, Physics, Baryon, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Particle Physics - Experiment
Published: 1996

144. Analysis of Hadronic Final States and the Photon Structure Function $F_2 ^\gamma$ in Deep Inelastic Electron-Photon Scattering at LEP

Author: W. R. Gibson, U. Müller, A. J. Martin, P. Scharff-Hansen, B. T. Bouwens, A. M. Smith, G. Vasseur, R. M. Brown, N. I. Geddes, Lorne Levinson, Michael Hildreth, C. Y. Chang, P. Taras, Michael Kobel, Gideon Bella, A. Skillman, R. Van Kooten, H. J. Burckhart, N. L. Rodning, Jacqueline Batley, Julie Kirk, P. E.L. Clarke, M. K. Jones, B. Poli, F. Wäckerle, D. M. Gingrich, J. P. Martin, Sachio Komamiya, C. K. Hargrove, S. De Jong, T. J. Smith, P. Schenk, Theodoros Geralis, E. Ros, A. T. Watson, W. J. McDonald, T. Omori, K. Stephens, P. Berlich, B. C. Shen, H. Przysiezniak, Reda Tafirout, Klaus Kurt Desch, A. N. Bell, Andris Skuja, C. R. Jones, T. P. Kokott, I. J. Bloodworth, S. Petzold, Siegfried Bethke, A. K. Honma, B. Nijjhar, James Pinfold, G. D. Long, S. W. O'Neale, Tetsuro Mashimo, K. J. Anderson, W. G. Scott, D. G. Fong, C. Lewis, J. Gascon, P. G. Estabrooks, R. K. Keeler, J. W. Gary, D. S. Koetke, Marcello Mannelli, M. Boutemeur, F. S. Merritt, W. Gorn, I. Nakamura, M. Schumacher, H. Lafoux, Matthias Schröder, E. Lefebvre, A. Malik, Ekg Sarkisyan, S. Yamashita, P. Igo-Kemenes, S. M. Gascon-Shotkin, F. X. Gentit, F. Odorici, John Allison, D. Glenzinski, K. Ishii, H. Jeremie, J. Bechtluft, P. W. Jeffreys, S. Robertson, Gregor Herten, J. A. McKenna, Dezso Horvath, M. J. Losty, G. G. Hanson, Jean-Arcady Meyer, Claire Shepherd-Themistocleous, V. Gibson, P. M. Watkins, R. E. Hughes-Jones, P. Gagnon, Robert McPherson, Otmar Biebel, C. Hartmann, D. E. Plane, M. Thiergen, G. Giacomelli, R. G. Kellogg, M. Steiert, Stephen Hillier, G. M. Dallavalle, P. Pfeifenschneider, Matthew Evans, A. M. Rossi, O. Schaile, Mathieu Doucet, T. R. Junk, Yoram Rozen, R. D. Heuer, Csaba Hajdu, P. Poffenberger, Fabrizio Fabbri, B. Wilkens, T. Tsukamoto, R. W. Springer, H. Mes, I. P. Duerdoth, H. M. Fischer, J. Patt, P. Fath, M. S. Dixit, E. do Couto e Silva, R. Bartoldus, Stefano Marcellini, M. Foucher, Frans Meijers, K. Nagai, I. Trigger, J. J. Ward, P. Schütz, P. Vikas, M. F. Turner-Watson, H. O. Ogren, Christoph Geich-Gimbel, M. Morii, Peter R Hobson, D. R. Ward, T. Kress, Dave Charlton, Georges Azuelos, S. Braibant, D. R. Rust, Sven Menke, D. Lanske, A. Rooke, T. Behnke, E. Tsur, J. G. Layter, A. Sittler, S. A. Robins, J. E. Pilcher, A. I. McNab, A. D. Schaile, Gabriella Pasztor, R. Bürgin, M. Verzocchi, K. W. Bell, Silvia Arcelli, J. E. Conboy, A. Fürtjes, A. M. Lee, P. Routenburg, E. von Törne, J. Pálinkás, A. Joly, D. Karlen, K. Ametewee, Achim Stahl, J. C. Hill, Misao Sasaki, R. Lahmann, M. Gruwé, C. M. Hawkes, Gideon Alexander, H. M. Bosch, D. C. Imrie, Daniel Lellouch, J. Goldberg, G. A. Snow, C. P. Ward, Richard Nisius, Takehiko Mori, Paolo Capiluppi, Tara Shears, J. Letts, G. P. Siroli, M. Fierro, J. E.G. Edwards, Marco Cuffiani, S. R. Lautenschlager, H. A. Neal, S. Söldner-Rembold, Paolo Giacomelli, M. Hansroul, Norbert Wermes, Sherry Towers, B. Stockhausen, Paul Kyberd, F. K. Loebinger, T. Hilse, V. Zacek, E. A. Mckigney, J. Steuerer, O. Runolfsson, W. P. Lai, Kiyotomo Kawagoe, C. Burgard, T. Kawamoto, P. A. Hart, Joleen Pater, R. Giacomelli, C. Beeston, R. J. Homer, J. Grunhaus, Claudio Grandi, D. Chrisman, Volker Blobel, D. Axen, A. Jawahery, U. Ruppel, M. R. Ingram, S. Orito, K. Sachs, B. Nellen, Shlomo Dado, N. J. Oldershaw, M. Rosvick, J. M. Roney, M. J. Pearce, M. Hapke, Peter Sherwood, Giora Mikenberg, Stephen Lloyd, Alexander Wagner, D. E. Hutchcroft, J. Ludwig, Stefan Schmitt, R. Howard, M. J. Oreglia, K. Runge, P. Bock, Ehud Duchovni, J. Lauber, J. S. White, J. R. Carter, G. N. Patrick, F. Strumia, P. Mättig, M. Jimack, A. Michelini, S. D. Talbot, Shoji Asai, G. W. Wilson, M. Hauschild, S. B. Anderson, S. A. Wotton, C. Markus, P. Szymanski, Satoshi Tanaka, T. Kobayashi, G. T. Jones, E. H. Vokurka, D. M. Strom, R. Rylko, H. G. Evans, P. S. Wells, M. J. Goodrick, I. Cohen, Stan Bentvelsen, Terry Richard Wyatt, J. E. Bloomer, Stefan Kluth, Shlomit Tarem, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Gunter Wolf, K. Ackerstaff, Guenter Duckeck, A. S. Turcot, F. Fiedler, M. Kolrep, C. Sbarra, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, T. J. McMahon, R. K. Carnegie, M. Herndon, M. Bobinski, J. A. Wilson, D. Lazic, C. Dallapiccola, N. Altekamp, R. J. Barlow, D. J. Miller, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, U. Jost, R. Mir, F. G. Oakham, B. Schmitt, E. L. Barberio, D. L. Rees, F. Scharf, German Martinez, W. Matthews, M. A. Thomson, E. K. U. Gross, A. Gaidot, M. Sproston, N. K. Watson, W. Mohr, and A. Posthaus
Subjects: Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Energy flow, Hadron, Angular dependence, Electron, Photon structure function, Photon scattering, Particle Physics - Experiment
Published: 1996

145. Multiplicity dependence of Bose-Einstein correlations in hadronic $Z^0$ decays

Author: U. Müller, T. J. McMahon, A. S. Turcot, A. J. Martin, Otmar Biebel, R. K. Carnegie, M. Bobinski, J. A. Wilson, R. Lahmann, J. Palinkas, D. C. Imrie, K. Sachs, Shlomo Dado, Dave Charlton, C. K. Hargrove, D. Lazic, R. Bürgin, S. Yamashita, M. Starks, Matthias Schröder, Giora Mikenberg, P. Igo-Kemenes, H. M. Fischer, S. Braibant, A. D. Schaile, Gabriella Pasztor, G. P. Siroli, G. A. Snow, C. P. Ward, S. Söldner-Rembold, M. Thiergen, H. Lafoux, T. Behnke, J. Letts, Norbert Wermes, P. Scharff-Hansen, K. Ishii, H. Jeremie, Sherry Towers, Ehud Duchovni, K. Stephens, M. Jimack, R. E. Hughes-Jones, M. Boutemeur, F. S. Merritt, T. Kawamoto, A. Michelini, Richard Keeler, M. Fierro, Gregor Herten, J. E.G. Edwards, M. F. Turner-Watson, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, M. Morii, Gideon Bella, C. Sbarra, Satoshi Tanaka, T. Kobayashi, B. Wilkens, C. H. Shepherd-Themistocleous, Peter R Hobson, S. Orito, M. Rosvick, Tara Shears, A. M. Smith, Ekg Sarkisyan, P. W. Jeffreys, Robert McPherson, M. Gruwé, Mathieu Doucet, C. M. Hawkes, P. Routenburg, Guenter Duckeck, P. Poffenberger, H. J. Burckhart, Jacqueline Batley, P. A. Hart, O. Schaile, R. Howard, J. S. White, W. R. Gibson, J. E. Pilcher, S. A. Robins, G. Yekutieli, G. Vasseur, M. Hapke, P. G. Estabrooks, E. do Couto e Silva, D. L. Rees, D. Chrisman, M. J. Pearce, R. D. Heuer, Fabrizio Fabbri, V. Gibson, Volker Blobel, J. Bechtluft, U. Jost, R. Mir, S. B. Anderson, G. W. Wilson, P. Szymanski, J. A. McKenna, Sachio Komamiya, P. Gagnon, Theodoros Geralis, E. Ros, A. A. Carter, Ron Folman, M. Hauschild, S. A. Wotton, Roger Jones, D. E. Hutchcroft, C. Markus, F. Scharf, German Martinez, R. Van Kooten, J. J. Ward, P. Vikas, B. T. Bouwens, Stephen Lloyd, Richard Nisius, D. Lanske, Robert M Brown, T. Omori, T. P. Kokott, A. Luig, T. R. Junk, D. M. Strom, Marco Cuffiani, B. J. King, G. T. Jones, P. Schütz, P. M. Watkins, M. J. Oreglia, A. Sittler, P. Utzat, James Pinfold, D. G. Fong, C. Lewis, Stan Bentvelsen, R. Bartoldus, S. R. Lautenschlager, H. A. Neal, J. Gascon, F. Wäckerle, Sven Menke, N. I. Geddes, Michael Hildreth, D. R. Ward, Lorne Levinson, C. R. Jones, T. Kress, Paolo Giacomelli, M. Hansroul, E. H. Vokurka, Kiyotomo Kawagoe, D. M. Gingrich, H. O. Ogren, H. M. Bosch, O. C. Cooke, R. Kowalewski, Christoph Geich-Gimbel, N. K. Watson, R. Rylko, K. Ametewee, N. L. Rodning, Gideon Alexander, B. Poli, J. R. Carter, G. N. Patrick, Silvia Arcelli, T. Hilse, H. Mes, O. Runolfsson, A. Malik, J. W. Gary, P. Berlich, D. S. Koetke, P. S. Wells, K. Nagai, Marcello Mannelli, S. L. Chu, Paolo Capiluppi, A. Joly, C. Burgard, J. Lauber, Terry Richard Wyatt, A. Skillman, J. E. Bloomer, D. R. Rust, Andris Skuja, I. P. Duerdoth, R. J. Homer, S. Petzold, G. D. Long, F. G. Oakham, J. von Krogh, F. X. Gentit, B. Schmitt, J. E. Conboy, S. M. Gascon-Shotkin, C. Beeston, Claudio Grandi, P. Fath, P. Weber, Tetsuro Mashimo, W. Mohr, A. M. Lee, M. Tecchio, E. von Törne, A. Fürtjes, C. Hartmann, D. E. Plane, E. L. Barberio, E. A. Mckigney, A. Posthaus, W. Gorn, Frank Fiedler, W. P. Lai, P. Pfeifenschneider, R. J. Hawkings, C. Y. Chang, Matthew Evans, A. M. Rossi, F. Strumia, S. D. Talbot, W. Matthews, J. Patt, L. A. del Pozo, Stephen Hillier, G. M. Dallavalle, T. Tsukamoto, M. A. Thomson, U. Ruppel, M. R. Ingram, J. M. Roney, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Achim Stahl, J. Steuerer, P. Taras, E. K. U. Gross, A. Gaidot, D. Rigby, R. J. Hemingway, Alan Watson, M. Sproston, Michael Kobel, Joleen Pater, R. Giacomelli, Reda Tafirout, Klaus Kurt Desch, John Allison, B. W. Kennedy, R. G. Kellogg, M. Steiert, Csaba Hajdu, P. Jovanovic, Stefano Marcellini, D. Axen, A. Jawahery, Julie Kirk, Austin Ball, Peter Krieger, Peter Sherwood, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, Manuella Vincter, Alessandro Montanari, C. Dallapiccola, M. Schumacher, E. Lefebvre, F. Odorici, N. Altekamp, S. W. O'Neale, R. J. Barlow, D. J. Miller, K. J. Anderson, Stefan Schmitt, T. J. Smith, P. Mättig, Shoji Asai, Daniel Lellouch, Takehiko Mori, V. Zacek, I. J. Bloodworth, Yoram Rozen, M. Foucher, W. J. McDonald, B. C. Shen, D. Karlen, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, I. Nakamura, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, R. W. Springer, Georges Azuelos, E. Tsur, M. Verzocchi, K. W. Bell, J. C. Hill, Misao Sasaki, Stefan Kluth, Shlomit Tarem, A. I. McNab, J. Goldberg, B. Nellen, H. G. Evans, M. J. Goodrick, I. Cohen, Gunter Wolf, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. De Jong, H. Przysiezniak, A. N. Bell, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, A. Rooke, J. G. Layter, and C. Charlesworth
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Unit increase, Electron–positron annihilation, Transverse momentum, Hadron, Bose–Einstein correlations, Multiplicity (chemistry), Particle Physics - Experiment
Abstract: Bose-Einstein correlations between like charged track pairs have been studied using a sample of approximately 3.6 million multihadronic Z0 decays collected with the OPAL detector at LEP. The radius of the emitting sourceR and the chaoticity parameterλ were studied using two parametrisations, the Goldhaber (G) parametrisation and the one-dimensional Kopylov-Podgoretskii (KP) parametrisation. The radiiR G andR KP are found to increase linearly with the average observed charged multiplicityn ch , with changes with respect to a unit increase inn ch of $$\begin{gathered} \frac{1}{{\langle R_G \rangle }}\frac{{\Delta R_G }}{{\Delta n_{ch} }} = (3.6 \pm 0.6) \cdot 10^{ - 3} and \hfill \\ \frac{1}{{\langle R_{KP} \rangle }}\frac{{\Delta R_{KP} }}{{\Delta n_{ch} }} = (3.4 \pm 1.0) \cdot 10^{ - 3} . \hfill \\ \end{gathered} $$ where the 〈R〉 are the radius values measured in the inclusive event sample. The chaoticity parametersλ G andλ KP decrease with increasing charged multiplicity. It is shown that the increase ofR with multiplicity may be connected with differences between two- and three-jet events.
Published: 1996

146. Strange baryon production in hadronic $Z^ 0$ decays

Author: D. J. Miller, R. Van Kooten, M. Hapke, R. Bartoldus, I. J. Bloodworth, Ekg Sarkisyan, P. W. Jeffreys, A. I. McNab, O. C. Cooke, D. E. Hutchcroft, H. O. Ogren, J. Goldberg, B. Nellen, F. Wäckerle, P. Poffenberger, P. S. Wells, Christoph Geich-Gimbel, J. J. Ward, P. Vikas, D. Lanske, D. M. Gingrich, D. Axen, A. Jawahery, M. Fierro, J. E.G. Edwards, M. J. Oreglia, Yoram Rozen, M. Foucher, S. R. Lautenschlager, H. A. Neal, Terry Richard Wyatt, J. E. Bloomer, T. Hilse, James Pinfold, M. F. Turner-Watson, H. Mes, O. Runolfsson, J. von Krogh, Peter Sherwood, D. G. Fong, C. Lewis, P. Schütz, C. Beeston, Claudio Grandi, I. P. Duerdoth, Frank Fiedler, M. Morii, P. Berlich, W. R. Gibson, Paolo Giacomelli, M. Hansroul, J. Gascon, Alexander Wagner, J. Ludwig, K. Runge, P. Bock, P. Fath, Peter R Hobson, H. G. Evans, W. J. McDonald, A. Rooke, B. C. Shen, J. G. Layter, R. J. Hawkings, L. A. del Pozo, M. J. Goodrick, F. X. Gentit, D. Karlen, C. Dallapiccola, Gideon Bella, I. Cohen, B. T. Bouwens, K. Stephens, A. Joly, C. Sbarra, P. Gagnon, C. Burgard, P. Routenburg, S. Yamashita, P. Igo-Kemenes, Siegfried Bethke, C. Charlesworth, J. R. Carter, J. W. Gary, K. Sachs, Shlomo Dado, C. H. Shepherd-Themistocleous, N. K. Watson, Gunter Wolf, J. E. Conboy, H. J. Burckhart, A. Fürtjes, A. K. Honma, B. Nijjhar, W. G. Scott, S. L. Chu, A. S. Turcot, G. N. Patrick, Stefan Schmitt, Jacqueline Batley, N. I. Geddes, Michael Hildreth, A. Sittler, R. J. Homer, D. S. Koetke, R. M. Brown, K. Ishii, H. Jeremie, Marcello Mannelli, I. Nakamura, G. Yekutieli, Lorne Levinson, N. Altekamp, Otmar Biebel, T. J. Smith, N. L. Rodning, Robert McPherson, H. M. Bosch, A. A. Carter, Ron Folman, Roger Jones, R. E. Hughes-Jones, V. Gibson, J. Lauber, R. J. Barlow, B. Poli, P. Scharff-Hansen, Mathieu Doucet, Giora Mikenberg, S. W. O'Neale, D. Glenzinski, Dezso Horvath, Gregor Herten, A. Skillman, Kiyotomo Kawagoe, K. J. Anderson, B. J. King, P. Utzat, P. Mättig, Shoji Asai, T. Omori, R. D. Heuer, Fabrizio Fabbri, W. Mohr, Richard Keeler, T. R. Junk, Achim Stahl, O. Schaile, M. Boutemeur, F. S. Merritt, M. J. Losty, Abish Malik, S. Braibant, Jean-Arcady Meyer, M. Schumacher, E. Lefebvre, B. Wilkens, A. D. Schaile, Gabriella Pasztor, F. Strumia, C. Hartmann, D. E. Plane, A. Posthaus, F. Odorici, H. M. Fischer, K. Nagai, S. B. Anderson, P. Szymanski, C. Y. Chang, P. Taras, S. D. Talbot, C. R. Jones, B. Stockhausen, Paul Kyberd, F. K. Loebinger, E. do Couto e Silva, Stephen Hillier, D. R. Rust, A. M. Smith, P. E.L. Clarke, P. Weber, M. K. Jones, T. J. McMahon, J. P. Martin, G. Vasseur, Michael Kobel, G. A. Snow, C. P. Ward, D. Rigby, R. J. Hemingway, G. M. Dallavalle, J. E. Pilcher, J. Letts, R. K. Carnegie, S. Söldner-Rembold, Daniel Lellouch, J. Bechtluft, Norbert Wermes, Sherry Towers, J. Steuerer, D. R. Ward, T. Kress, Joleen Pater, U. Ruppel, M. R. Ingram, Sven Menke, U. Müller, R. W. Springer, Sachio Komamiya, Andris Skuja, S. De Jong, Theodoros Geralis, E. Ros, S. Petzold, M. Bobinski, G. D. Long, A. J. Martin, A. M. Lee, Stefan Kluth, Shlomit Tarem, B. W. Kennedy, T. Kawamoto, Stan Bentvelsen, P. G. Estabrooks, P. Jovanovic, Julie Kirk, Alan Watson, R. Lahmann, M. Tecchio, E. von Törne, R. Giacomelli, Dave Charlton, D. L. Rees, Austin Ball, D. C. Imrie, T. P. Kokott, S. A. Robins, Takehiko Mori, A. Luig, T. Behnke, V. Zacek, F. Scharf, Peter Krieger, Georges Azuelos, S. Orito, M. Rosvick, J. A. Wilson, German Martinez, R. Howard, J. S. White, J. A. McKenna, Hans-Christian Schultz-Coulon, R. Bürgin, E. Tsur, Manuella Vincter, Tetsuro Mashimo, Alessandro Montanari, G. P. Siroli, D. Lazic, M. Verzocchi, K. W. Bell, H. Przysiezniak, W. Gorn, M. Gruwé, Randall Sobie, J. Pálinkás, Michael Schulz, G. D. Lafferty, W. Matthews, U. Jost, R. Mir, John Allison, C. M. Hawkes, M. A. Thomson, J. C. Hill, P. Pfeifenschneider, Misao Sasaki, A. N. Bell, C. K. Hargrove, Tara Shears, E. K. U. Gross, A. Gaidot, Reda Tafirout, Klaus Kurt Desch, M. Sproston, J. Patt, R. G. Kellogg, M. Steiert, M. Starks, Guenter Duckeck, P. A. Hart, P. M. Watkins, Csaba Hajdu, F. G. Oakham, Richard Nisius, G. G. Hanson, Stefano Marcellini, M. J. Pearce, B. Schmitt, E. L. Barberio, G. W. Wilson, G. Giacomelli, M. Hauschild, S. A. Wotton, Matthias Schröder, P. Schenk, C. Markus, M. Thiergen, H. Lafoux, G. T. Jones, D. M. Strom, E. H. Vokurka, M. S. Dixit, Frans Meijers, Marco Cuffiani, Silvia Arcelli, S. M. Gascon-Shotkin, R. Rylko, E. A. Mckigney, W. P. Lai, J. M. Roney, Matthew Evans, A. M. Rossi, T. Tsukamoto, Ehud Duchovni, M. Jimack, A. Michelini, Satoshi Tanaka, T. Kobayashi, D. Chrisman, Volker Blobel, Stephen Lloyd, R. Kowalewski, K. Ametewee, Gideon Alexander, and Paolo Capiluppi
Subjects: Quantum chromodynamics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Nuclear physics, Baryon, Diquark, Excited state, High Energy Physics::Experiment, Production (computer science), Nuclear Experiment, Particle Physics - Experiment
Abstract: The production of the $J^{P}={1⩈er 2}^{+}$ octet baryons Λ and Ξ−, the $J^{P}={3⩈er 2}^{+}$ decuplet baryons Σ(1385)±Ξ(1530)0, and Ω−, and the $J^{P}={3⩈er 2}^{-}$ orbitally excited state Λ(1520) has been measured in a sample of approximately 3.65 million hadronic Z0 decays. The integrated rates and the differential cross-sections as a function of xE, the scaled energy, are determined. The differential cross-sections of the Λ and Ξ− baryons are found to be softer than those predicted by both the JETSET and HERWIG Monte Carlo generators. The measured baryon yields are found to disagree with the simple diquark picture where only one tuning parameter for spin 1 diquarks is allowed. The yields are further compared with a thermodynamic model of hadron production which includes the production of orbitally excited mesons and baryons. The momentum spectra of Λ, Ξ−, Σ(1385)±Ξ(1530)0, and Λ(1520) are also compared to the predictions of an analytical QCD formula.
Published: 1996

147. $\Sigma^{+}$, $\Sigma^{0}$ and $\Sigma^{-}$ hyperon production in hadronic $Z^{0}$ decays

Author: James Pinfold, D. G. Fong, C. Lewis, P. E.L. Clarke, M. K. Jones, R. W. Springer, Sachio Komamiya, Theodoros Geralis, M. Gruwe, A. T. Watson, J. Gascon, Otmar Biebel, J. P. Martin, N. I. Geddes, Marco Verzocchi, Michael Hildreth, D. S. Koetke, Marcello Mannelli, Georges Azuelos, Dave Charlton, Matthias Schröder, E. Tsur, M. Boutemeur, F. S. Merritt, I. J. Bloodworth, C. M. Hawkes, R. W. L. Jones, K. W. Bell, R. Bürgin, S. De Jong, J. Letts, N. L. Rodning, E. Couto e do Silva, B. Poli, M. Thiergen, H. Lafoux, R. Lahmann, J. C. Hill, B. C. Shen, Misao Sasaki, Yoram Rozen, D. C. Imrie, M. Hansroul, T. P. Kokott, A. Luig, Norbert Wermes, Sherry Towers, T. Kawamoto, M. Foucher, J. Lauber, J. Bechtluft, J. A. McKenna, Gideon Bella, C. H. Shepherd-Themistocleous, Silvia Arcelli, T. J. Smith, W. J. McDonald, G. P. Siroli, S. Orito, H. Przysiezniak, M. Rosvick, H. J. Burckhart, A. N. Bell, Jacqueline Batley, M. F. Turner-Watson, M. Morii, A. Joly, Peter R Hobson, P. Routenburg, Ekg Sarkisyan, F. Strumia, S. D. Talbot, S. Yamashita, P. Scharff-Hansen, P. Igo-Kemenes, K. Stephens, Siegfried Bethke, M. Schumacher, E. Lefebvre, A. K. Honma, W. G. Scott, D. Karlen, T. Omori, I. Nakamura, S. B. Anderson, R. J. Homer, P. Szymanski, P. W. Jeffreys, K. Ishii, H. Jeremie, A. M. Smith, E. A. Mckigney, N. K. Watson, F. Odorici, C. Sbarra, H. M. Fischer, C. R. Jones, P. Giacomelli, T. Behnke, Richard Nisius, W. P. Lai, G. Vasseur, Andris Skuja, A. A. Carter, D. Glenzinski, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, Achim Stahl, P. A. Hart, R. E. Hughes-Jones, R. Bartoldus, S. Petzold, G. D. Long, G. G. Hanson, M. J. Oreglia, J. Goldberg, H. O. Ogren, Marco Cuffiani, P. Poffenberger, Tetsuro Mashimo, P. Gagnon, Volker Blobel, Carsten Daniel Burgard, B. Nijjhar, M. J. Pearce, D. R. Ward, T. Kress, V. Gibson, J. Allison, Christoph Geich-Gimbel, O. Schaile, A. I. McNab, A. Sittler, G. Giacomelli, J. M. Roney, B. Nellen, G. D. Lafferty, Stefan Schmitt, J. Palinkas, B. Schmitt, W. Mohr, H. M. Bosch, A. Posthaus, H-C. Schultz-Coulon, M. Hapke, Stephen Lloyd, Sven Menke, F. X. Gentit, G. N. Patrick, Kiyotomo Kawagoe, J. W. Gary, J. J. Ward, P. Vikas, J. E. Conboy, A. Fürtjes, M. Tecchio, J. R. Carter, S. M. Gascon-Shotkin, M. S. Dixit, Frans Meijers, K. Sachs, Shlomo Dado, M. J. Kobel, A. S. Turcot, H. G. Evans, M. J. Goodrick, P. Mättig, Shoji Asai, H. Mes, I. P. Duerdoth, G. Yekutieli, Ron Folman, P. Weber, D. E. Hutchcroft, P. Schütz, R. Kowalewski, Eduardo Ros, D. Axen, A. Jawahery, Frank Fiedler, I. Cohen, A. Rooke, M. A. Thomson, D. Lanske, S. A. Robins, Daniel Lellouch, P. Fath, W. R. Gibson, U. Ruppel, Reda Tafirout, Klaus Kurt Desch, D. M. Strom, W. Gorn, M. R. Ingram, R. Van Kooten, P. Pfeifenschneider, Takehiko Mori, B. J. King, P. Utzat, A. M. Rossi, C. Charlesworth, S. R. Lautenschlager, H. A. Neal, P. G. Estabrooks, R. K. Keeler, Gunter Wolf, Peter Sherwood, U. Müller, K. Ametewee, Giora Mikenberg, T. Hilse, D. L. Rees, A. J. Martin, T. Tsukamoto, J. Patt, J. G. Layter, R. G. Kellogg, M. Steiert, R. Rylko, C. Dallapiccola, V. Zacek, Alexander Wagner, Gideon Alexander, P. Kyberd, Paolo Capiluppi, P. M. Watkins, J. Ludwig, F. Scharf, German Martinez, K. Runge, P. Bock, Csaba Hajdu, Stefano Marcellini, S. Braibant, A. D. Schaile, Gabriella Pasztor, Ehud Duchovni, Randall Sobie, Michael Schulz, Stan Bentvelsen, W. Matthews, P. Schenk, C. Y. Chang, B. Stockhausen, F. K. Loebinger, O. C. Cooke, M. Jimack, J. Steuerer, Joleen Pater, C. K. Hargrove, A. Michelini, P. Taras, R. Howard, G. A. Snow, C. P. Ward, J. S. White, R. Giacomelli, E. K. U. Gross, A. Gaidot, Claudio Grandi, B. T. Bouwens, M. Sproston, Stefan Kluth, Shlomit Tarem, S. Söldner-Rembold, N. Altekamp, C.J. Beeston, Satoshi Tanaka, T. Kobayashi, T. G. Shears, R. M. Brown, D Chrisman, Lorne Levinson, J. von Krogh, Guenter Duckeck, P. S. Wells, A. Skillman, R. J. Hawkings, Abish Malik, Julie Kirk, T. R. Wyatt, C. Hartmann, D. E. Plane, L. A. del Pozo, D. J. Miller, R. J. Barlow, Stephen Hillier, F. Wäckerle, G. M. Dallavalle, T. J. McMahon, M. Evans, R. K. Carnegie, O. Runolfsson, M. Fierro, J. E.G. Edwards, D. M. Gingrich, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, P. Berlich, S. W. O'Neale, K. J. Anderson, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, U. Jost, R. Mir, R. D. Heuer, F. G. Oakham, E. L. Barberio, Robert McPherson, Mathieu Doucet, Fabrizio Fabbri, K. Nagai, D. R. Rust, A. M. Lee, E. von Törne, M. Bobinski, J. A. Wilson, D. Lazic, G. W. Wilson, M. Hauschild, S. A. Wotton, S. L. Chu, C. Markus, G. T. Jones, E. H. Vokurka, M. Starks, T. R. Junk, Gregor Herten, B. Wilkens, J. E. Pilcher, and J. E. Bloomer
Subjects: Nuclear physics, Baryon, Physics, Antiparticle, Particle physics, Physics and Astronomy (miscellaneous), Octet, Isospin, Electron–positron annihilation, Hadron, Hyperon, Production (computer science), Particle Physics - Experiment
Abstract: The production rates of the $J_{P}={1⩈er 2}^{+}$ octet Σ baryons in hadronic Z0 decays have been measured using the OPAL detector at LEP. The inclusive production rates per hadronic Z0 decay of the three isospin states (including the respective antiparticle) have been separately measured for the first time: $άtrix {n_{Sigma^{+}}=0.099pm 0.008pm 0.013ŗ n_{Sigma^{0}}=0.071pm 0.012pm 0.013ŗ n_{Sigma^{-}}=0.083pm 0.006pm 0.009ŗ}$ where the first error is statistical and the second is systematic. Differential cross-sections are also presented for the Σ+ and Σ− and compared with JETSET and HERWIG predictions. Assuming full isospin symmetry, the average inclusive rate is: ${1⩈er 3}[n_{Sigma^{+}+Sigma^{0}+Sigma^{-}}]=0.084pm 0.005 ({⤪ stat.}) pm 0.008 ({⤪ syst.})$.
Published: 1996

148. Search for unstable neutral and charged heavy leptons in $e^+ e^-$ collisions at $\sqrt{s}$ = 130 and 136 GeV

Author: S. R. Lautenschlager, H. A. Neal, T. Hilse, O. Runolfsson, C. Beeston, W. J. McDonald, Claudio Grandi, B. C. Shen, Ekg Sarkisyan, P. W. Jeffreys, A. I. McNab, J. Goldberg, B. Nellen, H. G. Evans, M. J. Goodrick, I. Cohen, Siegfried Bethke, A. K. Honma, B. Nijjhar, Gideon Bella, M. Boutemeur, F. S. Merritt, Stefan Kluth, Shlomit Tarem, P. Poffenberger, Sachio Komamiya, H. Mes, C. H. Shepherd-Themistocleous, H. J. Burckhart, Jacqueline Batley, T. J. Smith, K. Stephens, R. Van Kooten, W. G. Scott, I. Nakamura, U. Jost, R. Mir, Gunter Wolf, F. X. Gentit, P. Schütz, Theodoros Geralis, E. Ros, A. T. Watson, I. P. Duerdoth, P. Fath, T. J. McMahon, P. Scharff-Hansen, J. J. Ward, P. Vikas, J. Bechtluft, J. A. McKenna, D. Lanske, P. S. Wells, T. P. Kokott, A. Luig, R. K. Carnegie, D. Glenzinski, Dezso Horvath, G. G. Hanson, T. Behnke, T. Omori, M. J. Losty, Jean-Arcady Meyer, M. Bobinski, J. A. Wilson, Ehud Duchovni, Gregor Herten, F. G. Oakham, B. Schmitt, P. Gagnon, Terry Richard Wyatt, K. Sachs, Shlomo Dado, A. M. Smith, E. L. Barberio, M. Jimack, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Reda Tafirout, Klaus Kurt Desch, G. Giacomelli, R. Bartoldus, M. Hapke, G. Vasseur, J. E. Bloomer, Andris Skuja, P. Schenk, A. Michelini, B. Wilkens, D. J. Miller, D. Lazic, A. Sittler, O. C. Cooke, S. Petzold, G. D. Long, Tetsuro Mashimo, C. R. Jones, D. Rigby, R. J. Hemingway, J. Steuerer, M. S. Dixit, Frans Meijers, H. O. Ogren, Christoph Geich-Gimbel, D. E. Hutchcroft, A. Gaidot, B. W. Kennedy, J. E. Pilcher, Satoshi Tanaka, M. Schumacher, E. Lefebvre, T. Kobayashi, P. E.L. Clarke, M. K. Jones, P. Jovanovic, W. Gorn, R. Lahmann, W. R. Gibson, M. Gruwé, H. M. Bosch, V. Gibson, Austin Ball, Giora Mikenberg, J. P. Martin, F. Odorici, Peter Krieger, D. C. Imrie, Joleen Pater, C. Y. Chang, M. Fierro, J. E.G. Edwards, J. von Krogh, C. M. Hawkes, James Pinfold, D. G. Fong, C. Lewis, J. Lauber, F. Wäckerle, U. Müller, B. T. Bouwens, S. De Jong, M. F. Turner-Watson, M. Morii, R. J. Hawkings, Manuella Vincter, P. Pfeifenschneider, J. Gascon, J. E. Conboy, A. Fürtjes, P. Taras, R. M. Brown, Peter R Hobson, G. P. Siroli, R. W. Springer, L. A. del Pozo, Alessandro Montanari, S. Braibant, Lorne Levinson, A. Malik, M. J. Oreglia, J. W. Gary, A. D. Schaile, D. S. Koetke, F. Strumia, S. D. Talbot, Marcello Mannelli, C. Sbarra, H. Przysiezniak, D. M. Gingrich, Dave Charlton, Michael Kobel, Richard Nisius, Gabriella Pasztor, G. W. Wilson, C. Dallapiccola, R. Howard, M. Hauschild, R. Giacomelli, A. Skillman, T. R. Junk, G. Yekutieli, R. Kowalewski, A. N. Bell, P. Routenburg, J. S. White, S. A. Wotton, Georges Azuelos, R. Bürgin, C. Hartmann, D. E. Plane, Marco Cuffiani, G. A. Snow, Stephen Hillier, E. Tsur, C. Markus, A. A. Carter, Ron Folman, Roger Jones, M. Verzocchi, K. W. Bell, A. J. Martin, N. Altekamp, R. J. Barlow, D. R. Ward, H. Lafoux, C. P. Ward, G. M. Dallavalle, A. Rooke, J. G. Layter, J. Pálinkás, B. J. King, Kiyotomo Kawagoe, S. B. Anderson, K. Ametewee, D. Axen, P. Szymanski, T. Kress, S. Söldner-Rembold, A. Jawahery, J. C. Hill, Misao Sasaki, P. Utzat, Julie Kirk, G. T. Jones, J. Patt, Gideon Alexander, E. H. Vokurka, J. R. Carter, D. M. Strom, C. Charlesworth, S. L. Chu, Peter Sherwood, Alexander Wagner, Paolo Capiluppi, G. N. Patrick, Otmar Biebel, P. Berlich, J. Ludwig, R. Rylko, P. Weber, K. Runge, P. Bock, D. Chrisman, Volker Blobel, Stephen Lloyd, S. W. O'Neale, K. J. Anderson, Frank Fiedler, A. Joly, M. Starks, U. Ruppel, M. R. Ingram, J. Letts, Paolo Giacomelli, M. Hansroul, Norbert Wermes, Sherry Towers, T. Kawamoto, C. Burgard, R. J. Homer, S. Orito, Stan Bentvelsen, M. Rosvick, P. G. Estabrooks, R. K. Keeler, Achim Stahl, N. I. Geddes, Michael Hildreth, N. L. Rodning, B. Poli, Robert McPherson, S. M. Gascon-Shotkin, Mathieu Doucet, P. M. Watkins, R. D. Heuer, Matthew Evans, C. K. Hargrove, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Fabrizio Fabbri, A. M. Rossi, John Allison, T. Tsukamoto, K. Nagai, H. M. Fischer, Matthias Schröder, D. R. Rust, M. Thiergen, Silvia Arcelli, R. G. Kellogg, A. M. Lee, S. A. Robins, M. Steiert, M. Tecchio, E. von Törne, Csaba Hajdu, Stefano Marcellini, Tara Shears, Guenter Duckeck, E. A. Mckigney, P. A. Hart, M. J. Pearce, W. P. Lai, J. M. Roney, A. S. Turcot, D. L. Rees, F. Scharf, German Martinez, Daniel Lellouch, N. K. Watson, Takehiko Mori, V. Zacek, W. Mohr, S. Yamashita, A. Posthaus, W. Matthews, P. Igo-Kemenes, M. A. Thomson, K. Ishii, H. Jeremie, E. K. U. Gross, R. E. Hughes-Jones, M. Sproston, O. Schaile, E. do Couto e Silva, Sven Menke, Stefan Schmitt, P. Mättig, Shoji Asai, I. J. Bloodworth, Yoram Rozen, M. Foucher, and D. Karlen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, Dirac (video compression format), High Energy Physics::Phenomenology, Lower limit, Nuclear physics, Massless particle, MAJORANA, High Energy Physics::Experiment, Neutrino, Nuclear Experiment, Event (particle physics), Particle Physics - Experiment, Lepton
Abstract: Searches for unstable neutral and charged heavy leptons (L0, L±) have been performed using a data sample of 2.6 pb−1 at a centre-of-mass energy of s =130 GeV and 2.6 pb−1 at 136 GeV collected with the OPAL detector at LEP during November 1995. No candidate event was observed. If an unstable Dirac neutral heavy lepton L0 decays only into eW∗, μW∗ or τW∗, the lower limits on its mass at 95% C.L. are 62.5 GeV, 63.0 GeV and 57.4 GeV, respectively. The limits are modified for a Majorana L0 to 51.4 GeV, 52.2 GeV and 44.2 GeV, respectively. For charged heavy leptons, a lower mass limit of 64.5 GeV at 95% C.L. was obtained, if L± decays into a stable heavy neutrino ν l and W∗±, and m l± − mν l > 10 GeV. If L± decays through lepton flavour mixing into a massless neutrino νl and W∗±, the lower limit on m l± was determined to be 63.9 GeV at 95% C.L.
Published: 1996

149. A measurement of the B$_{d}^{0}$ oscillation frequency using leptons and D$*^{\pm}$ mesons

Author: W. J. McDonald, B. C. Shen, N. K. Watson, G. W. Wilson, Madjid Boutemeur, I. J. Bloodworth, M. Hauschild, S. A. Wotton, P. G. Estabrooks, R. K. Keeler, S. Yamashita, Otmar Biebel, C. Markus, W. Mohr, P. Igo-Kemenes, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, A. I. McNab, A. Posthaus, H. Jeremie, T. Behnke, Daniel Lellouch, Takehiko Mori, P. Gagnon, V. Zacek, P. M. Watkins, G. T. Jones, E. H. Vokurka, D. M. Strom, R. E. Hughes-Jones, Yoram Rozen, M. Foucher, Eilam Gross, J. Goldberg, B. Nellen, A. Sittler, Robert McPherson, D. Karlen, J. Letts, W. Matthews, H. Fukui, H. M. Bosch, Gideon Bella, C. Burgard, Mathieu Doucet, M. Gruwé, C. M. Hawkes, Ekg Sarkisyan, A. Rooke, J. G. Layter, R. D. Heuer, R. Rylko, C. Sbarra, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, P. W. Jeffreys, Norbert Wermes, Sherry Towers, T. Kawamoto, Stefan Schmitt, Fabrizio Fabbri, M. A. Thomson, E. do Couto e Silva, T. J. Smith, S. Braibant, Gabriella Pasztor, C. H. Shepherd-Themistocleous, H. J. Burckhart, Jacqueline Batley, Silvia Arcelli, C. Y. Chang, A. Gaidot, Sachio Komamiya, C. Charlesworth, Theodoros Geralis, E. Ros, A. T. Watson, P. Mättig, Tara Shears, T. Wlodek, Shoji Asai, Achim Stahl, Richard Nisius, M. Sproston, H. G. Evans, M. J. Goodrick, G. Yekutieli, P. A. Hart, Kiyotomo Kawagoe, P. Taras, O. Schaile, D. R. Rust, Sven Menke, T. Omori, Michael Kobel, I. Cohen, F. S. Merritt, Reda Tafirout, Klaus Kurt Desch, E. A. Mckigney, W. P. Lai, C. Dallapiccola, A. A. Carter, R. W. Springer, E. Lefebvre, Gunter Wolf, G. A. Snow, C. P. Ward, P. S. Wells, D. Axen, A. Jawahery, Peter Sherwood, Alexander Wagner, A. M. Lee, B. Schmitt, S. Söldner-Rembold, J. Ludwig, K. Runge, P. Bock, M. J. Pearce, M. Tecchio, E. von Törne, Ron Folman, Roger Jones, D. L. Rees, C. R. Jones, T. P. Kokott, A. Luig, P. Weber, Julie Kirk, J. J. Ward, Georges Azuelos, M. Starks, Terry Richard Wyatt, J. Lauber, J. E. Bloomer, J. M. Roney, P. Vikas, F. Scharf, German Martinez, E. Tsur, S. Orito, M. Rosvick, M. Verzocchi, K. W. Bell, B. J. King, F. Odorici, J. Pálinkás, P. Utzat, D. Lanske, A. D. Schaile, B. Stockhausen, Paul Kyberd, J. C. Hill, J. Bechtluft, J. A. McKenna, Misao Sasaki, F. K. Loebinger, R. Lahmann, Paolo Giacomelli, M. Hapke, D. E. Hutchcroft, M. J. Oreglia, M. Hansroul, Gregor Herten, R. Van Kooten, J. Steuerer, D. C. Imrie, N. Altekamp, U. Müller, S. R. Lautenschlager, J. R. Carter, G. N. Patrick, F. Strumia, Joleen Pater, C. Hartmann, S. D. Talbot, D. E. Plane, H. A. Neal, Shlomo Dado, B. Wilkens, A. J. Martin, R. J. Barlow, G. P. Siroli, O. C. Cooke, R. Giacomelli, Dave Charlton, G. G. Hanson, D. J. Miller, Stephen Hillier, M. F. Turner-Watson, G. M. Dallavalle, M. Morii, R. Bartoldus, Peter R Hobson, J. E. Pilcher, R. Bürgin, F. Wäckerle, S. W. O'Neale, John Allison, D. M. Gingrich, T. Hilse, R. Howard, H. O. Ogren, K. J. Anderson, R. J. Homer, P. Routenburg, Christoph Geich-Gimbel, J. S. White, H. Mes, C. K. Hargrove, O. Runolfsson, G. Giacomelli, R. G. Kellogg, P. Schenk, J. P. Pansart, M. Steiert, J. von Krogh, I. P. Duerdoth, Matthias Schröder, P. Berlich, Giora Mikenberg, Csaba Hajdu, Stefano Marcellini, J. E. Conboy, P. Fath, W. R. Gibson, M. S. Dixit, M. Thiergen, H. Lafoux, R. J. Hawkings, C. Beeston, D. Rigby, R. J. Hemingway, B. T. Bouwens, A. Joly, Claudio Grandi, F. X. Gentit, Frans Meijers, P. Poffenberger, A. Fürtjes, L. A. del Pozo, B. W. Kennedy, Lorne Levinson, P. Pfeifenschneider, P. E.L. Clarke, M. K. Jones, T. J. McMahon, P. Jovanovic, Gilles Beaudoin, P. Schütz, J. P. Martin, A. Skillman, M. Tscheulin, R. K. Carnegie, Austin Ball, Peter Krieger, S. De Jong, J. A. Wilson, Stefan Kluth, Shlomit Tarem, H. Przysiezniak, M. Fierro, J. E.G. Edwards, Manuella Vincter, Alessandro Montanari, A. N. Bell, D. Lazic, U. Jost, R. Mir, F. G. Oakham, E. L. Barberio, P. Scharff-Hansen, Marco Cuffiani, S. L. Chu, A. M. Smith, G. Vasseur, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, Andris Skuja, S. Petzold, G. D. Long, Tetsuro Mashimo, W. Gorn, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, Guenter Duckeck, S. B. Anderson, P. Szymanski, Stan Bentvelsen, A. S. Turcot, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, S. M. Gascon-Shotkin, M. Jimack, A. Michelini, Matthew Evans, A. M. Rossi, T. Tsukamoto, J. Hoare, N. I. Geddes, Michael Hildreth, Satoshi Tanaka, T. Kobayashi, N. L. Rodning, B. Poli, U. Ruppel, M. R. Ingram, H. M. Fischer, S. A. Robins, D. Chrisman, Volker Blobel, Stephen Lloyd, Robert M Brown, Frank Fiedler, K. Stephens, V. Gibson, T. R. Junk, D. R. Ward, and T. Kress
Subjects: Physics, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Oscillation, Electron–positron annihilation, Decay length, Charge (physics), Combined result, Particle Physics - Experiment, Bar (unit), Lepton
Abstract: Data collected with the OPAL detector during 1990–1994 are used to measure the time dependence of$B_d^0 \leftrightarrow \bar B_d^0 $ mixing. A sample of 348 D*± candidates with a lepton in the opposite hemisphere are reconstructed, of which 167±25 are expected to be from B d 0 decays. The B d 0 oscillation frequency is measured to be $$\Delta m_d = 0.567 \pm 0.089(stat)_{ - 0.023}^{ + 0.029} (syst) ps^{ - 1} .$$ . A previously published analysis ofΔm d using D*± and lepton candidates in the same hemisphere and jet charge is also updated with a larger data sample. From 1200 D*±l∓ candidates, of which 778±84 are expected to be from B d 0 decays, we find a value of: $$\Delta m_d = 0.539 \pm 0.060(stat) \pm 0.024(syst) ps^{ - 1} .$$ . The combined result of these two analyses is $$\Delta m_d = 0.548 \pm 0.050(stat)_{ - 0.019}^{ + 0.023} (syst) ps^{ - 1} .$$ .
Published: 1996

150. Measurements with photonic events in e+e- collisions at centre-of-mass energies of 130-140 GeV

Author: G. Alexander, J. Allison, N. Altekamp, K. Ametewee, K.J. Anderson, S. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, A.H. Ball, E. Barberio, R.J. Barlow, R. Bartoldus, J.R. Batley, G. Beaudoin, J. Bechtluft, C. Beeston, T. Behnke, A.N. Bell, K.W. Bell, G. Bella, S. Bentvelsen, P. Berlich, S. Bethke, O. Biebel, V. Blobel, I.J. Bloodworth, J.E. Bloomer, P. Bock, H.M. Bosch, M. Boutemeur, B.T. Bouwens, S. Braibant, R.M. Brown, H.J. Burckhart, C. Burgard, R. Bürgin, P. Capiluppi, R.K. Carnegie, A.A. Carter, J.R. Carter, C.Y. Chang, C. Charlesworth, D.G. Charlton, D. Chrisman, S.L. Chu, P.E.L. Clarke, I. Cohen, J.E. Conboy, O.C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola, G.M. Dallavalle, C. Darling, S. De Jong, L.A. del Pozo, M.S. Dixit, E. do Couto e Silva, M. Doucet, E. Duchovni, G. Duckeck, I.P. Duerdoth, J.E.G. Edwards, P.G. Estabrooks, H.G. Evans, M. Evans, F. Fabbri, P. Fath, F. Fiedler, M. Fierro, H.M. Fischer, R. Folman, D.G. Fong, M. Foucher, H. Fukui, A. Fürtjes, P. Gagnon, A. Gaidot, J.W. Gary, J. Gascon, S.M. Gascon-Shotkin, N.I. Geddes, C. Geich-Gimbel, S.W. Gensler, F.X. Gentit, T. Geralis, G. Giacomelli, P. Giacomelli, R. Giacomelli, V. Gibson, W.R. Gibson, D.M. Gingrich, J. Goldberg, M.J. Goodrick, W. Gorn, C. Grandi, E. Gross, M. Gruwé, C. Hajdu, G.G. Hanson, M. Hansroul, M. Hapke, C.K. Hargrove, P.A. Hart, C. Hartmann, M. Hauschild, C.M. Hawkes, R. Hawkings, R.J. Hemingway, G. Herten, R.D. Heuer, M.D. Hildreth, J.C. Hill, S.J. Hillier, T. Hilse, P.R. Hobson, R.J. Homer, A.K. Honma, D. Horváth, R. Howard, R.E. Hughes-Jones, D.E. Hutchcroft, P. Igo-Kemenes, D.C. Imrie, M.R. Ingram, A. Jawahery, P.W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, G. Jones, M. Jones, R.W.L. Jones, U. Jost, P. Jovanovic, J. Kanzaki, D. Karlen, T. Kawamoto, R.K. Keeler, R.G. Kellogg, B.W. Kennedy, J. King, J. Kirk, S. Kluth, T. Kobayashi, M. Kobel, D.S. Koetke, T.P. Kokott, S. Komamiya, R. Kowalewski, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G.D. Lafferty, H. Lafoux, R. Lahmann, W.P. Lai, D. Lanske, J. Lauber, J.G. Layter, A.M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, C. Lewis, S.L. Lloyd, F.K. Loebinger, G.D. Long, B. Lorazo, M.J. Losty, J. Ludwig, A. Luig, A. Malik, M. Mannelli, S. Marcellini, C. Markus, A.J. Martin, J.P. Martin, G. Martinez, T. Mashimo, W. Matthews, P. Mättig, W.J. McDonald, J. McKenna, E.A. Mckigney, T.J. McMahon, A.I. McNab, F. Meijers, S. Menke, F.S. Merritt, H. Mes, J. Meyer, A. Michelini, G. Mikenberg, D.J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, M. Morii, U. Müller, B. Nellen, B. Nijjhar, R. Nisius, S.W. O'Neale, F.G. Oakham, F. Odorici, H.O. Ogren, T. Omori, M.J. Oreglia, S. Orito, M. Palazzo, J. Pálinkás, J.P. Pansart, G. Pásztor, J.R. Pater, G.N. Patrick, M.J. Pearce, S. Petzold, J.E. Pilcher, J. Pinfold, D.E. Plane, P. Poffenberger, B. Poli, A. Posthaus, H. Przysiezniak, D.L. Rees, D. Rigby, M.G. Rison, S.A. Robins, N. Rodning, J.M. Roney, A. Rooke, E. Ros, A.M. Rossi, M. Rosvick, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, D.R. Rust, R. Rylko, E.K.G. Sarkisyan, M. Sasaki, C. Sbarra, A.D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, P. Schenk, B. Schmitt, M. Schröder, H.C. Schultz-Coulon, M. Schulz, P. Schütz, J. Schwiening, W.G. Scott, T.G. Shears, B.C. Shen, C.H. Shepherd-Themistocleous, P. Sherwood, G.P. Siroli, A. Sittler, A. Skillman, A. Skuja, A.M. Smith, T.J. Smith, G.A. Snow, R. Sobie, S. Söldner-Rembold, R.W. Springer, M. Sproston, A. Stahl, M. Starks, K. Stephens, J. Steuerer, B. Stockhausen, D. Strom, F. Strumia, P. Szymanski, R. Tafirout, H. Takeda, P. Taras, S. Tarem, M. Tecchio, N. Tesch, M. Thiergen, M.A. Thomson, E. von Törne, S. Towers, M. Tscheulin, E. Tsur, A.S. Turcot, M.F. Turner-Watson, P. Utzat, R. Van Kooten, G. Vasseur, M. Verzocchi, P. Vikas, M. Vincter, E.H. Vokurka, F. Wäckerle, A. Wagner, C.P. Ward, D.R. Ward, J.J. Ward, P.M. Watkins, A.T. Watson, N.K. Watson, P. Weber, P.S. Wells, N. Wermes, J.S. White, B. Wilkens, G.W. Wilson, J.A. Wilson, T. Wlodek, G. Wolf, S. Wotton, T.R. Wyatt, S. Xella, S. Yamashita, G. Yekutieli, K. Yoshimura, and V. Zacek
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Photon, Mass distribution, business.industry, Electron–positron annihilation, Resonance, law.invention, Standard Model, Nuclear physics, law, Excited state, High Energy Physics::Experiment, Photonics, business, Collider, Particle Physics - Experiment
Abstract: Cross-sections and angular distributions for the production of events with single and multiple photons are measured from data recorded with the OPAL detector at the recently upgraded LEP collider. The measured cross-sections are generally consistent with Standard Model expectations for the e + e − → ν v γ(γ) and e+e− → γγ(γ) processes. Six events with an acoplanar photon pair and large missing mass are found. The observed number of events is larger than expected from e + e − → ν ν γγ ; however, the missing mass distribution is compatible with the Z0 resonance. Deviations from QED are constrained by the data on e+e− → γγ(γ). Lower limits are set at 95% confidence level on the QED cut-off parameters Λ+ and Λ− of 152 GeV and 142 GeV, respectively, and also on the mass of an excited electron of 147 GeV.
Published: 1996

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