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1. Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events

Author: M. Hapke, D. C. Imrie, M. Palazzo, I. J. Bloodworth, Theodoros Geralis, D. Rigby, R. J. Hemingway, A. D. Schaile, A. S. Turcot, U. Müller, H. M. Fischer, Gregor Herten, Ehud Duchovni, S. W. Gensler, S. J. Hillier, S. L. Chu, A. H. Ball, Silvia Arcelli, B. Wilkens, Robert Wayne Springer, A. J. Martin, A. Michelini, D.L. Wagner, P. Jovanovic, G. P. Siroli, J. King, B. C. Shen, T. P. Kokott, A. Luig, P. Igo-Kemenes, M. J. Oreglia, S. Braibant, J. G. Layter, J. E. Pilcher, J.A. Lauber, G. Yekutieli, Peter Krieger, Siegfried Bethke, S. A. Robins, D Chrisman, P.G. Bright-Thomas, Yoram Rozen, J. Schwiening, H. Jeremie, M. Jimack, John Allison, G. A. Beck, W. G. Scott, P. Weber, C. K. Hargrove, M. Hauschild, Stefan Kluth, C. Charlesworth, M. Foucher, Manuella Vincter, K. Stephens, Achim Stahl, H. Mes, E. A. Mckigney, Shlomit Tarem, R. W. L. Jones, S. A. Wotton, A. A. Carter, Gabriella Pasztor, Alessandro Montanari, J. R. Carter, F. Strumia, S. W. O'Neale, W.John McDonald, W. P. Lai, Doug Gingrich, B. Nijjhar, T. R. Wyatt, T. Kress, T. Kobayashi, M. J. Pearce, R. E. Hughes-Jones, R. G. Kellogg, Stefania Xella, C. Markus, S. B. Anderson, D. S. Koetke, G. W. Wilson, Csaba Hajdu, R. Bürgin, B. Fabbro, Ron Folman, Rick J. Van Kooten, K. Ametewee, Stefano Marcellini, G. A. Snow, C. P. Ward, E. H. Vokurka, G. N. Patrick, D. L. Rees, Gideon Alexander, Paolo Capiluppi, D. M. Strom, P R Poffenberger, F. S. Merritt, R. Kowalewski, C. Stegmann, James Letts, Michael Hildreth, B. Schmitt, S. Söldner-Rembold, G. D. Lafferty, C. J. Oram, Robert M Brown, H-C. Schultz-Coulon, N. J. Oldershaw, Daniel Lellouch, S. Komamiya, N. L. Rodning, S. G. Clowes, M. Boutemeur, Otmar Biebel, J. Palinkas, D. Axen, G. Giacomelli, Matthias Schröder, M. Fierro, H. Fukui, A. Jawahery, Takehiko Mori, Shlomo Dado, D. E. Hutchcroft, K. J. Anderson, B. Stockhausen, F. K. Loebinger, B. Poli, C. Dallapiccola, BT Bouwens, G. Duckeck, R. Rylko, P. Vikas, H. Lafoux, J. E.G. Edwards, V. Gibson, Stan Bentvelsen, Gideon Bella, A. P. Wagner, Norbert Wermes, G. Mikenberg, Joleen Pater, Peter Sherwood, P. G. Estabrooks, H. J. Burckhart, G. G. Hanson, Jacqueline Batley, Margret Fincke-Keeler, M. Starks, Dezso Horvath, M. J. Losty, M. F. Turner-Watson, J. Ludwig, K. Runge, P. Bock, R. Giacomelli, R. K. Keeler, M. Morii, A. I. McNab, J. Steuerer, D. R. Ward, P.A. Hart, Peter R Hobson, B. J. King, Jean-Arcady Meyer, P. Utzat, P. M. Watkins, J. Bechtluft, P. Gagnon, P. S. Wells, David E. Plane, E. do Couto e Silva, J. Goldberg, S. J. De Jong, N. K. Watson, S. M. Gascon-Shotkin, T. Omori, Eilam Gross, B. Nellen, T. Hilse, A. T. Watson, F. Palmonari, A. K. Honma, P. Schenk, N. Altekamp, A. Sittler, C. Darling, T. J. Smith, M. G. Rison, Michael Schulz, J. E. Bloomer, A. Joly, P. Szymanski, P. Kyberd, M. J. Kobel, P. Mättig, H. M. Bosch, Sherry Towers, Shoji Asai, T. Kawamoto, N. I. Geddes, M. S. Dixit, D. Hochman, Frans Meijers, R. J. Sobie, A. M. Rossi, G.Marco Dallavalle, O. C. Cooke, D. J. Miller, U. C. Dunwoody, S. Orito, P. Schütz, M. Rosvick, Sven Menke, T. Behnke, Claudio Grandi, R. Howard, M. Tscheulin, J. P. Pansart, Frank Fiedler, H. G. Evans, David G. Charlton, T. W. Pritchard, J.P. Martin, H. Przysiezniak, Richard Nisius, M. Sasaki, R. Bartoldus, E. Lefebvre, Paolo Giacomelli, A. N. Bell, P. W. Jeffreys, M. J. Goodrick, F. Odorici, I. Cohen, Marco Cuffiani, M. Hansroul, Georges Azuelos, A. M. Lee, J. W. Gary, E. Tsur, H. O. Ogren, Robert Lahmann, C. M. Hawkes, Andris Skuja, C. Y. Chang, J. A. McKenna, G. D. Long, U. Jost, R. Mir, Tetsuro Mashimo, J. von Krogh, Christoph Geich-Gimbel, K. W. Bell, W. Gorn, I. P. Duerdoth, P. Fath, James Pinfold, C. H. Shepherd-Themistocleous, D. G. Fong, C. Lewis, J. Gascon, J. J. Ward, Carla Sbarra, J. E. Conboy, J. C. Hill, V. Zacek, P. Taras, A. Malik, Carsten Daniel Burgard, M. A. Thomson, D. Lanske, Marcello Mannelli, R. J. Hawkings, P. Scharff-Hansen, R. J. Homer, A. M. Smith, G. Vasseur, B. Lorazo, L. A. del Pozo, H. Takeda, R. D. Heuer, S. L. Lloyd, F. X. Gentit, F. G. Oakham, T. J. McMahon, E. L. Barberio, E.K.G. Sarkisian, A. Fürtjes, Julie Kirk, R. K. Carnegie, M. Tecchio, J. A. Wilson, C. Hartmann, O. Runolfsson, W. R. Gibson, Lorne Levinson, P. D. Phillips, D. Karlen, B. W. Kennedy, Gilles Beaudoin, O. Schaile, Roger Barlow, Fabrizio Fabbri, C.J. Beeston, T. G. Shears, F. Wäckerle, Gy. Wolf, P. Berlich, D. R. Rust, E. von Törne, Matthew Jones, Eduardo Ros, Reda Tafirout, W. Matthews, A. Skillman, A. Gaidot, T. Wlodek, M. Sproston, P. Routenburg, T. Tsukamoto, N. Tesch, Satoru Yamashita, J. M. Roney, P. E. L. Clarke, W. Mohr, A. Posthaus, F. Scharf, and German Martinez
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), Forward backward, Particle Physics - Experiment, Mixing (physics), Lepton
Published: 1996

2. J/ $\psi$ and $\psi^\prime$ production in hadronic ${\rm Z}^0$ decays

Author: Gunter Wolf, R. Lahmann, D. C. Imrie, M. Palazzo, I. J. Bloodworth, R. Bartoldus, S. Wotton, H. O. Ogren, Christoph Geich-Gimbel, J. Lauber, P. Poffenberger, E.K.G. Sarkisian, P. S. Wells, David E. Plane, G. P. Siroli, J. King, Frank Fiedler, D. Hochman, Terry Richard Wyatt, M. Hapke, S. Yamashita, P. Igo-Kemenes, Yoram Rozen, J. E. Bloomer, M. Foucher, E. A. Mckigney, D. E. Hutchcroft, Dixit, Matthias Schröder, F. Strumia, Gideon Bella, G.Marco Dallavalle, P. Schütz, T. J. Smith, K. Stephens, C. H. Shepherd-Themistocleous, B. Stockhausen, Paul Kyberd, F. K. Loebinger, P. W. Jeffreys, W.John McDonald, W. P. Lai, D. Chrisman, H. Lafoux, V. Gibson, H. Jeremie, F. X. Gentit, P. Scharff-Hansen, D. R. Ward, T. Kress, M. J. Oreglia, H. J. Burckhart, Jacqueline Batley, D. Karlen, R. E. Hughes-Jones, S. Braibant, Stefan Kluth, Joleen Pater, J. E. Conboy, A. Fürtjes, C. Burgard, Shlomit Tarem, S. B. Anderson, P. Szymanski, Gabriella Pasztor, P. Bright-Thomas, J. M. Roney, S. L. Chu, R. Giacomelli, C. M. Hawkes, A. M. Smith, Daniel Lellouch, Stephen Lloyd, Robert M Brown, C. J. Oram, R. D. Heuer, G. Vasseur, S. M. Gascon-Shotkin, Takehiko Mori, Fabrizio Fabbri, J. J. Ward, P. Vikas, J. R. Carter, Madjid Boutemeur, G. A. Beck, Achim Stahl, G. N. Patrick, Tara Shears, G. A. Snow, C. P. Ward, T. Omori, A. I. McNab, N. J. Oldershaw, C. Hartmann, D. M. Strom, C. Stegmann, B. Lorazo, J. Goldberg, U. C. Dunwoody, D. Lanske, Ehud Duchovni, Otmar Biebel, H. Fukui, E. do Couto e Silva, H. Mes, S. Söldner-Rembold, P. Gagnon, P. A. Hart, Stan Bentvelsen, B. Nellen, R. Rylko, I. P. Duerdoth, V. Zacek, James Pinfold, D. L. Wagner, M. Jimack, D. G. Fong, C. Lewis, P. G. Estabrooks, A. Sittler, M. J. Pearce, A. Joly, R. K. Keeler, P. Fath, F. S. Merritt, F. Wäckerle, Thomson, J. Gascon, S. W. O'Neale, Georges Azuelos, T. Hilse, O. Schaile, D. M. Gingrich, Sven Menke, E. Tsur, S. W. Gensler, K. J. Anderson, P. M. Watkins, Hans-Christian Schultz-Coulon, H. G. Evans, H. M. Bosch, Randall Sobie, A. M. Rossi, M. J. Goodrick, I. Cohen, S. J. Hillier, Michael Schulz, G. D. Lafferty, T. Kobayashi, P. Weber, O. Runolfsson, B. Schmitt, J. Letts, M. Starks, R. Howard, A. Malik, Norbert Wermes, T. Behnke, J. Palinkas, T. Tsukamoto, J. W. Gary, W. R. Gibson, K. W. Bell, John Allison, P. Berlich, U. Müller, J. P. Pansart, T. W. Pritchard, Sherry Towers, Hildreth, T. Kawamoto, J. Steuerer, C. Y. Chang, Shlomo Dado, H. M. Fischer, D. Axen, A. Jawahery, A. Michelini, G. W. Wilson, J. C. Hill, Misao Sasaki, C. Beeston, C. Darling, A. J. Martin, D. S. Koetke, B. T. Bouwens, Claudio Grandi, M. Hauschild, Marcello Mannelli, Guenter Duckeck, M. Rosvick, D. R. Rust, David G. Charlton, C. Markus, B. C. Shen, P. Mättig, R. G. Kellogg, Paolo Giacomelli, Shoji Asai, M. Hansroul, E. Lefebvre, Lorne Levinson, Peter Sherwood, P. Taras, Michael Kobel, Alexander Wagner, Siegfried Bethke, A. S. Turcot, E. H. Vokurka, A. K. Honma, B. Nijjhar, W. G. Scott, S. A. Robins, P. D. Phillips, Andris Skuja, J. Bechtluft, Csaba Hajdu, F. Odorici, Stefano Marcellini, Gilles Beaudoin, C. K. Hargrove, J. Ludwig, G. D. Long, K. Runge, J. A. McKenna, P. Bock, Roger Barlow, A. M. Lee, A. Skillman, R. J. Homer, Richard Nisius, Giora Mikenberg, M. Tecchio, R. Bürgin, E. von Törne, Tetsuro Mashimo, B. Fabbro, Gregor Herten, Marco Cuffiani, Dezso Horvath, M. J. Losty, B. Wilkens, Reda Tafirout, Margret Fincke-Keeler, Jean-Arcady Meyer, S. G. Clowes, Julie Kirk, J. E. Pilcher, M. Fierro, J. E.G. Edwards, N. I. Geddes, W. Gorn, N. L. Rodning, B. Poli, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, C. Sbarra, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, P. E.L. Clarke, M. K. Jones, J. P. Martin, S. Orito, M. Tscheulin, S. De Jong, U. Jost, R. Mir, Sachio Komamiya, H. Takeda, Theodoros Geralis, F. G. Oakham, E. L. Barberio, E. Ros, A. T. Watson, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, Robert Wayne Springer, C. Dallapiccola, T. P. Kokott, A. Luig, N. Altekamp, D. J. Miller, W. Matthews, H. Przysiezniak, E. K. U. Gross, A. Gaidot, T. Wlodek, M. Sproston, N. Tesch, N. K. Watson, W. Mohr, A. Posthaus, M. F. Turner-Watson, M. Morii, Peter R Hobson, D. L. Rees, A. N. Bell, F. Scharf, German Martinez, A. D. Schaile, P. Routenburg, J. G. Layter, C. Charlesworth, Stefania Xella, G. G. Hanson, G. Giacomelli, P. Schenk, R. Kowalewski, Rick J. Van Kooten, Frans Meijers, K. Ametewee, Gideon Alexander, Paolo Capiluppi, and Silvia Arcelli
Subjects: Nuclear physics, Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, B meson, Production rate, Lepton
Abstract: The production of J/psi mesons in Z(0) decays is studied using 3.6 million hadronic events recorded by the OPAL detector at LEP. The inclusive Z(0) to J/psi and b-quark to J/psi branching ratios are measured from the total yield of J/psi mesons, identified from their decays into lepton pairs. The J/psi momentum distribution is used to study the fragmentation of b-quarks. The production rate of psi' mesons, identified from their decays into a J/psi and a pi(+)pi(-) pair, is measured as well. The following results are obtained:Br(Z(0)-->J/psi X) = (3.9 +/- 0.2 +/- 0.3). 10(-3) and Br(Z(0)-->psi' X) = (1.6 +/- 0.3 +/- 0.2). 10(-3),where the first error is statistical and the second systematic. Finally the J/psi sample is used to reconstruct exclusive b-hadron decays and calculate the corresponding b-hadron branching ratios and masses.
Published: 1996

3. Measurement of the branching ratio

Author: F. S. Merritt, Otmar Biebel, D. L. Wagner, D. E. Hutchcroft, C. Dallapiccola, O. C. Cooke, I. J. Bloodworth, J. Bechtluft, D. M. Strom, C. Stegmann, H. M. Fischer, H. Fukui, R. Rylko, Margret Fincke-Keeler, A. Michelini, D. R. Rust, J. von Krogh, Yoram Rozen, R. W. Springer, R. Lahmann, D. C. Imrie, M. Palazzo, J. Letts, M. Foucher, R. J. Sobie, N. Altekamp, R. Howard, P. E.L. Clarke, Norbert Wermes, Sherry Towers, J. P. Pansart, S. Braibant, Gabriella Pasztor, P. Gagnon, R. J. Hawkings, T. Kawamoto, R. Bartoldus, E. Lefebvre, G. P. Siroli, J. King, P. Igo-Kemenes, M. K. Jones, W. Matthews, A. M. Lee, T. Behnke, J. Steuerer, S. A. Robins, P. S. Wells, J. Allison, D. J. Miller, H. O. Ogren, A. T. Watson, J. P. Martin, S. Orito, L. A. del Pozo, J. E. Bloomer, Joleen Pater, C. Y. Chang, H. Jeremie, M. Tscheulin, M. A. Thomson, M. Rosvick, Christoph Geich-Gimbel, P. Scharff-Hansen, Stefan Kluth, Shlomit Tarem, M. Tecchio, E. von Törne, A. Sittler, C. Burgard, F. Odorici, S. De Jong, Sachio Komamiya, Theodoros Geralis, Georges Azuelos, D Darlen, J. R. Carter, R. E. Hughes-Jones, C. P. Ward, E. K. U. Gross, Gideon Bella, A. Gaidot, T. Wlodek, M. Sproston, C. H. Shepherd-Themistocleous, C. Sbarra, C. J. Oram, E. Ros, W. R. Gibson, S. L. Lloyd, F. X. Gentit, Gregor Herten, P. Taras, E. Tsur, A. Joly, S. Söldner-Rembold, H. M. Bosch, A. S. Turcot, Michael Kobel, M. Hapke, J. E. Conboy, A. Fürtjes, H. J. Burckhart, Jacqueline Batley, K. W. Bell, G. Yekutieli, T. P. Kokott, C. Darling, V. Gibson, A. Luig, N. I. Geddes, J. A. McKenna, B. Wilkens, J. C. Hill, B. T. Bouwens, N. Tesch, H. Przysiezniak, A. M. Smith, Michael Hildreth, Paolo Giacomelli, G.A Show, Gunter Wolf, Silvia Arcelli, Satoru Yamashita, M. Hansroul, W.J. McDonald, D. Rigby, R. J. Hemingway, A. A. Carter, Ron Folman, A. N. Bell, E. do Couto e Silva, U. Müller, T. J. Smith, N. L. Rodning, K. Stephens, G. Vasseur, B. Lorazo, B. Poli, R. M. Brown, D. Axen, Lorne Levinson, A. Jawahery, P. Mättig, Richard Nisius, M. J. Oreglia, S. Wotton, J. E. Pilcher, T. Omori, Shoji Asai, B. W. Kennedy, B. J. King, C. M. Hawkes, P. D. Phillips, Julie Kirk, T. Hilse, O. Schaile, B. C. Shen, Andris Skuja, A. J. Martin, J. Palinkas, Peter Sherwood, Marco Cuffiani, Daniel Lellouch, H. Mes, N. J. Oldershaw, D. L. Rees, Shlomo Dado, I. P. Duerdoth, P. Fath, G. D. Long, R. J. Homer, R. G. Kellogg, P. Utzat, Gilles Beaudoin, A. Skillman, P. Jovanovic, Austin Ball, M. G. Rison, Alexander Wagner, Csaba Hajdu, Peter Krieger, Takehiko Mori, Sven Menke, Siegfried Bethke, Tetsuro Mashimo, J. Ludwig, K. Runge, P. Bock, A. K. Honma, A. I. McNab, J. Goldberg, G. N. Patrick, F. Scharf, S. B. Anderson, B. Nellen, German Martinez, Stefano Marcellini, S. M. Gascon-Shotkin, T. J. McMahon, Manuella Vincter, J. Schwiening, G. G. Hanson, Alessandro Montanari, M. F. Turner-Watson, P. Szymanski, O. Runolfsson, M. Morii, Peter R Hobson, W. G. Scott, R. D. Heuer, G. A. Beck, Achim Stahl, J. Lauber, J. W. Gary, B. Stockhausen, Paul Kyberd, Reda Tafirout, F. K. Loebinger, Fabrizio Fabbri, A. D. Schaile, R. Van Kooten, S. L. Chu, F. Strumia, H. G. Evans, M. J. Goodrick, I. Cohen, N. K. Watson, G. Mikenberg, U. Jost, R. K. Carnegie, R. Mir, J. A. Wilson, P. Poffenberger, Dave Charlton, R. Giacomelli, C. K. Hargrove, P. Routenburg, P. Schütz, W. Gorn, D. R. Ward, T. Kress, P. Weber, Stan Bentvelsen, Dezso Horvath, U. C. Dunwoody, Claudio Grandi, B. Schmitt, J. M. Roney, P. A. Hart, G. Giacomelli, P. Schenk, M. Starks, C.J. Beeston, M. J. Losty, Jean-Arcady Meyer, T. G. Shears, E. A. Mckigney, Abish Malik, Ekg Sarkisyan, P. W. Jeffreys, B. Nijjhar, T. Kobayashi, H. Takeda, C. Hartmann, D. E. Plane, F. Wäckerle, R. Bürgin, B. Fabbro, M. Sasaki, D. M. Gingrich, M. S. Dixit, Frans Meijers, M. J. Pearce, G. M. Dallavalle, W. P. Lai, F. G. Oakham, G. W. Wilson, W. Mohr, P. Berlich, James Pinfold, M. Hauschild, Hans-Christian Schultz-Coulon, A. Posthaus, P. Bright-Thomas, Michael Schulz, E. L. Barberio, A. M. Rossi, D. G. Fong, C. Lewis, J. Gascon, Frank Fiedler, D. Hochman, J. J. Ward, T. Tsukamoto, P. Vikas, D. Lanske, C. Markus, Matthias Schröder, T. W. Pritchard, V. Zacek, H. Lafoux, T. R. Wyatt, D. S. Koetke, G. D. Lafferty, Guenter Duckeck, R. J. Barlow, Marcello Mannelli, R. W.L. Jones, Madjid Boutemeur, S. G. Clowes, M. Fierro, J. E.G. Edwards, J. G. Layter, S. W. O'Neale, E. H. Vokurka, P. G. Estabrooks, R. K. Keeler, P. M. Watkins, C. Charlesworth, K. J. Anderson, Stefania Xella, D. Chrisman, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, M. Jimack, S. W. Gensler, and S. J. Hillier
Subjects: Nuclear physics, Physics, Nuclear and High Energy Physics, Branching fraction, Electron–positron annihilation, Detector, Weak interaction, Charged current, Universality (dynamical systems)
Abstract: The branching ratio of the τ− → e−νeντ decay mode has been measured with the OPAL detector to be (17.78 ± 0.10 ±0.09)% where the first error is statistical and the second is systematic. The branching ratio, together with other measurements, has been used to test e — μ and μ — τ universality in the charged current weak interaction.
Published: 1996

4. Measurement of the average b-baryon lifetime and the product branching ratio {\boldmath {{f({\mathrm{b}} \rightarrow \Lambda_{\mathrm{b}}) \cdot BR(\Lambda_{\mathrm{b}} \rightarrow \Lambda \ell^- \bar{\nu} \mathrm{X})}}}

Author: G. G. Hanson, G. Giacomelli, P. Schenk, Frans Meijers, A. I. McNab, J. Goldberg, J. G. Layter, Dixit, C. Charlesworth, O. C. Cooke, N. K. Watson, S. M. Gascon-Shotkin, P. W. Jeffreys, T. Kobayashi, B. Nellen, P. G. Estabrooks, U. C. Dunwoody, Margret Fincke-Keeler, A. M. Lee, M. Tscheulin, Eduardo Ros, Abish Malik, D. Rigby, R. J. Hemingway, Robert Lahmann, I. P. Duerdoth, J.P. Martin, D. Axen, H. Przysiezniak, P. Fath, C. Hartmann, Otmar Biebel, Gideon Bella, P. M. Watkins, C. Darling, T. J. Smith, R. Bartoldus, H. G. Evans, M. J. Goodrick, I. Cohen, H. J. Burckhart, D.L. Wagner, P. Jovanovic, Peter Krieger, A. Jawahery, A. M. Rossi, H. Deng, A. Stahl, S. B. Anderson, T. Tsukamoto, J. von Krogh, Ehud Duchovni, Jacqueline Batley, P. Igo-Kemenes, J. W. Gary, H. O. Ogren, S. L. Chu, T. Kress, O. Runolfsson, Alan Watson, M. J. Kobel, P. Mättig, J. Ludwig, J. J. Ward, D. Lanske, Doug Gingrich, H. Jeremie, Manuella Vincter, Alessandro Montanari, Shlomo Dado, K. Runge, P. Bock, Christoph Geich-Gimbel, R. J. Hawkings, A. H. Ball, Silvia Arcelli, S. J. De Jong, Shoji Asai, L. A. del Pozo, James Pinfold, R. E. Hughes-Jones, D. E. Hutchcroft, C. Dallapiccola, J. M. Roney, S. W. Gensler, W. R. Gibson, David G. Charlton, E. Lefebvre, H. Mes, H. Fischer, G. Mikenberg, S. W. O'Neale, Georges Azuelos, B. Stockhausen, F. K. Loebinger, J. D. Gillies, D. G. Fong, Daniel Lellouch, T. J. McMahon, S. J. Hillier, Carla Sbarra, S. Komamiya, T. R. Wyatt, Kiyotomo Kawagoe, C. M. Hawkes, A. K. Honma, J.A. Lauber, J. Schwiening, J. Gascon, Takehiko Mori, F. Odorici, V. Gibson, C.J. Beeston, Sherry Towers, G. Duckeck, R. K. Carnegie, A. P. Wagner, K. W. Bell, N. Altekamp, E. A. Mckigney, N. L. Rodning, T. Kawamoto, Frank Fiedler, S. G. Clowes, M. Boutemeur, Stan Bentvelsen, Norbert Wermes, E. do Couto e Silva, J. C. Hill, D. J. Miller, A. Beck, M. Fierro, J. E.G. Edwards, Eugene P. Gross, F. Wäckerle, J. A. McKenna, J. A. Wilson, B. Poli, M. W. Redmond, M. F. Turner-Watson, Peter Sherwood, P. E. L. Clarke, F. X. Gentit, M. Morii, B. C. Shen, Peter R Hobson, W. Mohr, W. P. Lai, V. Zacek, R. Kowalewski, J. E. Conboy, K. J. Anderson, S. Orito, J. C. Clayton, A. Posthaus, D. C. Imrie, A. Fürtjes, Siegfried Bethke, Gy. Wolf, P. Berlich, D. Karlen, P. Gagnon, Thomson, T. Geralis, Rick J. Van Kooten, Sven Menke, P. Szymanski, Stefan Kluth, M. Rosvick, Shlomit Tarem, M. Tecchio, Lorne Levinson, W. G. Scott, P. Weber, R. Giacomelli, T. Hilse, I. J. Bloodworth, G. P. Siroli, J. King, K. Ametewee, P. D. Phillips, O. Schaile, M. Hapke, G. T. Zorn, G. D. Lafferty, Marcello Mannelli, J. E. Duboscq, A. Michelini, Gideon Alexander, Paolo Capiluppi, Hans-Christian Schultz-Coulon, P. Kyberd, C. J. Oram, B. W. Kennedy, Pedro Teixeira-Dias, Robert Wayne Springer, Paolo Giacomelli, H. M. Bosch, M. Hansroul, Gilles Beaudoin, T. P. Kokott, A. Luig, J. Steuerer, Andris Skuja, M. Settles, Michael Schulz, Wolfram Dietrich Zeuner, Roger Barlow, M. J. Losty, Claudio Grandi, F. Palmonari, G. D. Long, F. S. Merritt, Yoram Rozen, Fabrizio Fabbri, S. A. Robins, G. A. Snow, C. P. Ward, Tetsuro Mashimo, Carsten Daniel Burgard, M. Foucher, M. Jimack, John Allison, K. Stephens, T. W. Pritchard, P. Vikas, Matthew Jones, M. J. Oreglia, C. H. Shepherd-Themistocleous, D. R. Rust, G. Yekutieli, F. Scharf, G. W. Wilson, G.Marco Dallavalle, P. Schütz, D. L. Rees, S. Söldner-Rembold, S. Braibant, T. Behnke, J. R. Carter, Junichi Kanzaki, R. J. Homer, Stephen Lloyd, E. von Törne, Robert M Brown, Reda Tafirout, W. Gorn, A. A. Carter, J. Bechtluft, M. Sasaki, Ron Folman, W. Matthews, R. W. L. Jones, Marco Cuffiani, R. G. Kellogg, A. Skillman, G. N. Patrick, C. Y. Chang, A. Gaidot, B. J. King, A. D. Schaile, A. S. Turcot, D. R. Ward, P. Taras, P. Scharff-Hansen, D. S. Koetke, T. Wlodek, M. Sproston, P. Utzat, Marcello Fanti, Julie Kirk, G. A. Beck, P. Routenburg, N. Tesch, R. Bürgin, Stefano Marcellini, B. Fabbro, James Letts, A. M. Smith, G. Vasseur, B. Lorazo, M. G. Rison, A. Joly, N. I. Geddes, D. Hochman, B. Schmitt, Gregor Herten, B. Wilkens, J. E. Pilcher, N. J. Oldershaw, R.J. Akers, M. Starks, M. Hauschild, S. A. Wotton, C. Markus, P. S. Wells, David E. Plane, P R Poffenberger, P.G. Bright-Thomas, A. Buijs, D. M. Strom, C. Stegmann, H. Fukui, Richard Keeler, R. J. Sobie, R. Howard, R. Mir, Matthias Schröder, R. D. Heuer, H. Lafoux, F. G. Oakham, P.A. Hart, J. P. Pansart, U. Müller, A. J. Martin, E. L. Barberio, C. K. Hargrove, Tara Shears, B. Nijjhar, and M. J. Pearce
Subjects: Physics, Baryon, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), Branching fraction, Product (mathematics), Electron–positron annihilation, Bibliography, Neutrino, Lambda
Published: 1996

5. Measurement of the average b-baryon lifetime and the product branching ratio $$f(b \to \Lambda _b ) \cdot BR(\Lambda _b \to \Lambda \ell ^ - \bar vX)$$

Author: R. Lahmann, D. C. Imrie, C. Y. Chang, P. Taras, Michael Kobel, G. P. Siroli, J. King, I. J. Bloodworth, O. C. Cooke, S. L. Chu, Stefan Kluth, M. Hapke, D. Axen, A. Jawahery, Shlomit Tarem, J. C. Clayton, M. Settles, Julie Kirk, H. Lafoux, R. Kowalewski, D. E. Hutchcroft, Gideon Bella, C. J. Oram, G. W. Wilson, P. Igo-Kemenes, Yoram Rozen, J. von Krogh, M. Hauschild, H. J. Burckhart, Jacqueline Batley, H. Mes, K. Stephens, M. Foucher, M. J. Oreglia, H. Jeremie, K. Ametewee, C. Markus, R. E. Hughes-Jones, R. J. Hawkings, R. Bartoldus, Peter Sherwood, V. Gibson, Tara Shears, Alexander Wagner, Frank Fiedler, D. Hochman, Gunter Wolf, F. X. Gentit, Gideon Alexander, Paolo Capiluppi, L. A. del Pozo, I. P. Duerdoth, Kiyotomo Kawagoe, P. Fath, Junichi Kanzaki, D. Karlen, H. O. Ogren, Christoph Geich-Gimbel, D. R. Ward, T. Kress, T. J. McMahon, J. Schwiening, P. S. Wells, U. C. Dunwoody, P. A. Hart, J. Ludwig, P. Poffenberger, K. Runge, P. Bock, R. K. Carnegie, C. Burgard, E. do Couto e Silva, N. J. Oldershaw, R.J. Akers, J. R. Carter, Terry Richard Wyatt, G. N. Patrick, J. A. Wilson, M. J. Pearce, Ehud Duchovni, J. Steuerer, P. Schütz, S. Wotton, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Sven Menke, P. Weber, O. Schaile, S. G. Clowes, S. B. Anderson, P. Szymanski, A. Gaidot, P. Scharff-Hansen, M. Fierro, J. E.G. Edwards, Otmar Biebel, D. L. Wagner, R. W. Springer, M. Jimack, J. E. Conboy, A. Fürtjes, Sachio Komamiya, Theodoros Geralis, A. I. McNab, J. Goldberg, H. Deng, S. Braibant, P. W. Jeffreys, M. Starks, E. Ros, A. T. Watson, A. J. Martin, B. Nellen, D. L. Rees, J. Letts, F. Palmonari, Silvia Arcelli, S. W. Gensler, S. J. Hillier, T. Kobayashi, Georges Azuelos, Norbert Wermes, Sherry Towers, R. Giacomelli, F. Scharf, A. M. Smith, T. Kawamoto, F. S. Merritt, C. Darling, P. Bright-Thomas, T. J. Smith, C. Sbarra, Matthias Schröder, G. A. Snow, C. P. Ward, E. Lefebvre, Stan Bentvelsen, G. Vasseur, S. Orito, B. Lorazo, M. Rosvick, Marco Cuffiani, S. W. O'Neale, K. W. Bell, K. J. Anderson, A. D. Schaile, H. G. Evans, M. J. Goodrick, S. Söldner-Rembold, I. Cohen, T. P. Kokott, A. Luig, Andris Skuja, P. Gagnon, A. Buijs, F. Odorici, D. M. Strom, J. C. Hill, Misao Sasaki, G. Yekutieli, Dave Charlton, J. J. Ward, P. Vikas, D. Lanske, P. Mättig, Shoji Asai, B. C. Shen, G. D. Long, Tetsuro Mashimo, Paolo Giacomelli, M. Hansroul, A. A. Carter, C. Stegmann, J. A. McKenna, Gregor Herten, Siegfried Bethke, A. Joly, Ron Folman, Roger Jones, Shlomo Dado, N. K. Watson, Gordon H. Hanson, A. K. Honma, Stephen Lloyd, B. Nijjhar, G. T. Zorn, W. G. Scott, M. Tecchio, C. M. Hawkes, B. Wilkens, G. Giacomelli, A. S. Turcot, B. J. King, H. Fukui, P. Utzat, R. Bürgin, B. Fabbro, M. W. Redmond, M. G. Rison, C. H. Shepherd-Themistocleous, E. A. Mckigney, J. Bechtluft, M. F. Turner-Watson, J. P. Pansart, T. Hilse, M. Morii, W. Gorn, H. M. Bosch, Wolfram Dietrich Zeuner, John Allison, P. Schenk, Peter R Hobson, Giora Mikenberg, Daniel Lellouch, Takehiko Mori, J. E. Pilcher, N. I. Geddes, R. J. Homer, O. Runolfsson, P. Routenburg, U. Müller, M. J. Losty, R. G. Kellogg, W. Mohr, A. Posthaus, W. P. Lai, M. S. Dixit, Stefano Marcellini, N. L. Rodning, C. Beeston, James Pinfold, Claudio Grandi, B. Poli, D. G. Fong, W. Matthews, M. A. Thomson, Frans Meijers, J. Gascon, V. Zacek, G. A. Beck, C. K. Hargrove, E. K. U. Gross, A. Malik, T. Wlodek, R. Howard, Achim Stahl, P. Teixeira-Dias, M. Sproston, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, J. M. Roney, T. Tsukamoto, N. Tesch, T. Behnke, S. M. Gascon-Shotkin, J. G. Layter, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, B. Schmitt, Madjid Boutemeur, C. Charlesworth, Margret Fincke-Keeler, T. W. Pritchard, P. E.L. Clarke, M. K. Jones, J. P. Martin, P. G. Estabrooks, M. Tscheulin, R. K. Keeler, Guenter Duckeck, S. De Jong, A. M. Rossi, H. Przysiezniak, P. M. Watkins, H. M. Fischer, A. Michelini, S. A. Robins, C. Dallapiccola, J. D. Gillies, N. Altekamp, R. J. Barlow, D. J. Miller, R. Mir, J. Lauber, F. G. Oakham, E. L. Barberio, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, D. R. Rust, C. Hartmann, D. E. Plane, G. M. Dallavalle, A. M. Lee, E. von Törne, W. R. Gibson, A. Beck, R. Van Kooten, R. M. Brown, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, F. Wäckerle, Reda Tafirout, D. M. Gingrich, P. Berlich, M. Fanti, R. D. Heuer, and Fabrizio Fabbri
Subjects: Physics, Quark, Particle physics, Muon, Physics and Astronomy (miscellaneous), Branching fraction, High Energy Physics::Phenomenology, Lambda, Baryon, Nuclear physics, High Energy Physics::Experiment, Baryon number, Impact parameter, Nuclear Experiment, Lepton
Abstract: The average lifetime of b-flavoured baryons measured with the OPAL detector is updated to include data collected between 1990 and 1994 at LEP. Bottom-flavoured baryons that decay semileptonically and produce aΛ baryon are identified through the correlation of the baryon number of theΛ and the electric charge of the lepton. To measure the lifetime, the decay point of the b baryon is estimated by theΛ-lepton vertex, and the observed distribution of decay lengths is fitted simultaneously in 874 right-sign and 384 wrong-sign combinations. In a separate method, the impact parameter distribution of the leptons is fitted in a subset of these data. When the two results are combined, taking correlations into account, the average b-baryon lifetime is found to be τ=1.16±0.11(stat.)±0.06(syst.) ps. Using the same data, the product branching ratio is measured to be$\begin{gathered} \hfill f(b \to \Lambda _b ) \cdot BR(\Lambda _b \to \Lambda \ell ^ - \bar vX) = (2.91 \pm 0.23(stat.) \\ \hfill \pm 0.25(stat.)) \cdot 10^{ - 3} \\ \end{gathered} $, where the symbolf(b→Λb) is the fraction of b quarks from Z0 decays forming b baryons,Λb represents all b-flavoured baryons and l is either an electron or a muon.
Published: 1995

6. Measurement of the τ−→h − h + h − v τ and τ−→h − h + h −≥1π0 v τ branching ratios

Author: Madjid Boutemeur, G. D. Long, Tetsuro Mashimo, P. G. Estabrooks, R. K. Keeler, W. Gorn, P. M. Watkins, R. Bartoldus, Otmar Biebel, D. L. Wagner, H. O. Ogren, C. Y. Chang, S. Braibant, Christoph Geich-Gimbel, H. Deng, G. G. Hanson, P. Taras, G. Giacomelli, W. R. Gibson, G. A. Snow, C. P. Ward, N. J. Oldershaw, F. X. Gentit, J. E. Conboy, J. Letts, P. Schenk, Michael Kobel, A. Beck, S. Söldner-Rembold, Norbert Wermes, A. Fürtjes, R.J. Akers, R. Kowalewski, Sherry Towers, M. S. Dixit, T. Kawamoto, G. A. Beck, R. M. Brown, Lorne Levinson, Frans Meijers, Achim Stahl, P. Teixeira-Dias, P. D. Phillips, P. E.L. Clarke, M. K. Jones, Gilles Beaudoin, P. Igo-Kemenes, Julie Kirk, H. Lafoux, A. Skillman, S. Orito, M. Rosvick, F. Palmonari, O. Schaile, K. Ametewee, R. G. Kellogg, Silvia Arcelli, J. P. Martin, M. Tscheulin, B. Schmitt, S. De Jong, H. Jeremie, N. K. Watson, R. Lahmann, D. C. Imrie, Matthias Schröder, Gideon Alexander, Paolo Capiluppi, R. E. Hughes-Jones, Reda Tafirout, M. Fanti, J. Steuerer, H. Przysiezniak, V. Gibson, E. A. Mckigney, O. C. Cooke, Margret Fincke-Keeler, F. S. Merritt, M. Hapke, M. Starks, G. P. Siroli, J. King, D. E. Hutchcroft, C. Dallapiccola, P. Scharff-Hansen, Sachio Komamiya, W. P. Lai, Theodoros Geralis, E. Ros, A. T. Watson, E. do Couto e Silva, S. Marcllini, J. D. Gillies, W. Mohr, A. Posthaus, Dave Charlton, J. Bechtluft, J. A. McKenna, Shlomo Dado, J. von Krogh, R. J. Hawkings, Ehud Duchovni, A. M. Smith, G. Vasseur, R. Howard, C. Hartmann, D. E. Plane, N. Altekamp, B. Lorazo, James Pinfold, D. G. Fong, P. Poffenberger, T. J. Smith, K. Stephens, P. Schütz, L. A. del Pozo, B. C. Shen, R. Bürgin, B. Fabbro, G. M. Dallavalle, G. W. Wilson, M. Hauschild, J. G. Layter, Sven Menke, H. Mes, M. J. Oreglia, J. P. Pansart, Giora Mikenberg, J. Gascon, T. P. Kokott, A. Luig, T. J. McMahon, D. J. Miller, C. Markus, D. L. Rees, C. Charlesworth, A. Malik, G. N. Patrick, U. Müller, A. J. Martin, J. Schwiening, I. P. Duerdoth, R. K. Carnegie, D. Axen, J. W. Gary, Paolo Giacomelli, R. D. Heuer, A. Jawahery, Fabrizio Fabbri, D. S. Koetke, F. Scharf, M. Hansroul, M. Jimack, J. A. Wilson, Marcello Mannelli, J. E. Duboscq, S. W. Gensler, P. Fath, Siegfried Bethke, A. K. Honma, A. D. Schaile, Kiyotomo Kawagoe, Gideon Bella, Marco Cuffiani, S. J. Hillier, Peter Sherwood, A. Buijs, T. Kobayashi, H. J. Burckhart, Alexander Wagner, Jacqueline Batley, W. Matthews, C. Sbarra, D. M. Strom, C. Stegmann, T. R. Wyatt, M. A. Thomson, J. Ludwig, K. Runge, D. R. Rust, C. H. Shepherd-Themistocleous, P. Bock, G. Yekutieli, C. K. Hargrove, H. Fukui, E. K. U. Gross, P. Weber, W. G. Scott, A. Gaidot, T. Wlodek, M. F. Turner-Watson, A. A. Carter, M. Sproston, Ron Folman, Roger Jones, P. Gagnon, U. C. Dunwoody, P. A. Hart, J. Allison, D. R. Ward, T. Kress, Gregor Herten, B. J. King, R. J. Barlow, M. Morii, P. Utzat, B. Nijjhar, S. L. Chu, R. J. Homer, Peter R Hobson, N. Tesch, G. T. Zorn, M. J. Pearce, A. M. Lee, R. Mir, M. G. Rison, B. Wilkens, S. W. O'Neale, K. J. Anderson, E. Lefebvre, E. von Törne, H. M. Bosch, S. G. Clowes, Wolfram Dietrich Zeuner, P. Routenburg, J. E. Pilcher, M. Fierro, J. E.G. Edwards, F. Odorici, Frank Fiedler, D. Hochman, P. W. Jeffreys, R. Van Kooten, P. S. Wells, J. C. Clayton, Stephen Lloyd, T. Behnke, C.J. Beeston, T. G. Shears, M. Tecchio, F. Wäckerle, J. Lauber, D. M. Gingrich, P. Berlich, P. Bright-Thomas, J. J. Ward, P. Vikas, D. Lanske, F. G. Oakham, M. J. Losty, E. L. Barberio, T. Hilse, O. Runolfsson, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Claudio Grandi, Austin Ball, Peter Krieger, R. W. Springer, Manuella Vincter, Alessandro Montanari, Georges Azuelos, K. W. Bell, J. C. Hill, Misao Sasaki, J. M. Roney, G. D. Lafferty, A. Joly, M. W. Redmond, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Giacomelli, A. I. McNab, J. Goldberg, S. M. Gascon-Shotkin, B. Nellen, H. G. Evans, M. J. Goodrick, I. Cohen, A. M. Rossi, T. Tsukamoto, Stefan Kluth, H. M. Fischer, Shlomit Tarem, A. Michelini, C. J. Oram, Gunter Wolf, S. A. Robins, S. Wotton, J. R. Carter, N. I. Geddes, N. L. Rodning, B. Poli, I. J. Bloodworth, M. Settles, Yoram Rozen, M. Foucher, Junichi Kanzaki, D. Karlen, C. Burgard, C. M. Hawkes, Daniel Lellouch, A. S. Turcot, Takehiko Mori, V. Zacek, C. Darling, P. Mättig, Shoji Asai, S. B. Anderson, P. Szymanski, Stan Bentvelsen, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, T. W. Pritchard, Guenter Duckeck, and Andris Skuja
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Branching fraction, Electron–positron annihilation, Analytical chemistry, Branching (polymer chemistry), Engineering (miscellaneous), Charged particle, Lepton
Abstract: The branching ratios of the τ−→h − h + h − v τ and τ−→h − h + h −≥1π0 v τ decays, whereh is either a charged π orK meson, are measured using a data sample of 87861 τ+τ− pairs collected with the OPAL detector at LEP. The two branching ratios are extracted simultaneously from a sample of three charged particle decays and found to be: $$\begin{gathered} B(\tau ^ - \to h^ - h^ + h^ - \nu _\tau ) = (9.87 \pm 0.10 \pm 0.24)\% \hfill \\ B(\tau ^ - \to h^ - h^ + h^ - \geqslant 1\pi ^0 \nu _\tau ) = (5.09 \pm 0.10 \pm 0.23)\% \hfill \\ \end{gathered}$$ where the first error is statistical and the second systematic. The branching ratio of the τ lepton into three charged particles is measured to be: $$B(\tau ^ - \to 3 - prong) = (14.96 \pm 0.09 \pm 0.22)\%$$
Published: 1995

7. A study of QCD structure constants and a measurement of $$\alpha _s (M_{Z^0 } )$$ at LEP using event shape observables

Author: S. Braibant, H. M. Fischer, T. J. McMahon, Otmar Biebel, A. Michelini, D. L. Wagner, Gunter Wolf, F. X. Gentit, G. A. Snow, C. P. Ward, H. Deng, S. Söldner-Rembold, Reda Tafirout, S. A. Robins, P. E.L. Clarke, R. Kowalewski, J. Schwiening, M. K. Jones, G. W. Wilson, J. Letts, Frank Fiedler, D. Hochman, M. Hauschild, R. Lahmann, D. C. Imrie, J. P. Martin, E. Lefebvre, Norbert Wermes, Sherry Towers, C. Markus, R. K. Carnegie, Andris Skuja, M. Tscheulin, S. De Jong, N. J. Oldershaw, J. A. Wilson, R.J. Akers, O. Schaile, T. Kawamoto, Paolo Giacomelli, C. M. Hawkes, M. Starks, K. Ametewee, K. Stephens, F. Odorici, Daniel Lellouch, Madjid Boutemeur, M. Hansroul, S. Wotton, Matthias Schröder, Takehiko Mori, Shlomo Dado, Gideon Alexander, Paolo Capiluppi, G. P. Siroli, J. King, M. Fanti, W. R. Gibson, S. Orito, M. Rosvick, G. D. Long, Tetsuro Mashimo, P. G. Estabrooks, R. K. Keeler, V. Gibson, H. Przysiezniak, C. H. Shepherd-Themistocleous, V. Zacek, R. J. Homer, J. Steuerer, A. Beck, Gregor Herten, B. Wilkens, Lorne Levinson, J. P. Pansart, M. Hapke, R. W. Springer, J. E. Pilcher, R. Bartoldus, C. Dallapiccola, Eilam Gross, C. Sbarra, Margret Fincke-Keeler, P. M. Watkins, J. D. Gillies, P. D. Phillips, Gilles Beaudoin, Giora Mikenberg, A. Skillman, T. Hilse, D. E. Hutchcroft, W. Gorn, Hans-Christian Schultz-Coulon, D. R. Ward, T. Kress, A. M. Rossi, N. K. Watson, O. Runolfsson, Ehud Duchovni, M. Jimack, P. S. Wells, G. Yekutieli, Randall Sobie, Michael Schulz, G. D. Lafferty, R. D. Heuer, U. Müller, C. Hartmann, D. E. Plane, A. I. McNab, P. Igo-Kemenes, Georges Azuelos, M. J. Oreglia, T. Tsukamoto, Fabrizio Fabbri, G. G. Hanson, A. J. Martin, H. O. Ogren, F. Palmonari, J. C. Clayton, Silvia Arcelli, D. Axen, Christoph Geich-Gimbel, S. W. Gensler, S. J. Hillier, C. Darling, T. J. Smith, Terry Richard Wyatt, A. A. Carter, Ron Folman, T. Kobayashi, N. Altekamp, R. Van Kooten, Roger Jones, Kiyotomo Kawagoe, G. M. Dallavalle, T. W. Pritchard, J. Goldberg, K. W. Bell, H. Mes, C. Beeston, R. J. Barlow, H. Jeremie, J. R. Carter, G. N. Patrick, J. C. Hill, P. Scharff-Hansen, P. Schenk, N. I. Geddes, Claudio Grandi, Misao Sasaki, A. Jawahery, Marco Cuffiani, B. Stockhausen, Paul Kyberd, F. K. Loebinger, P. W. Jeffreys, P. Mättig, Shoji Asai, I. P. Duerdoth, P. Fath, Dave Charlton, Sachio Komamiya, Theodoros Geralis, Guenter Duckeck, B. Nellen, B. C. Shen, D. J. Miller, S. W. O'Neale, R. E. Hughes-Jones, N. L. Rodning, E. Ros, A. T. Watson, M. S. Dixit, W. Mohr, Siegfried Bethke, A. K. Honma, B. Nijjhar, A. M. Smith, Frans Meijers, W. G. Scott, F. Wäckerle, B. Poli, E. A. Mckigney, D. M. Gingrich, K. J. Anderson, J. E. Conboy, S. L. Chu, A. Fürtjes, A. Posthaus, B. J. King, P. Utzat, M. G. Rison, A. Buijs, C. K. Hargrove, G. A. Beck, P. Weber, Achim Stahl, P. Teixeira-Dias, T. P. Kokott, A. Luig, Peter Sherwood, G. Vasseur, B. Lorazo, Tara Shears, E. do Couto e Silva, W. P. Lai, Alexander Wagner, P. Berlich, D. M. Strom, R. Bürgin, B. Fabbro, C. Stegmann, I. J. Bloodworth, Stephen Lloyd, W. Matthews, P. Bright-Thomas, F. S. Merritt, J. Ludwig, G. Giacomelli, O. C. Cooke, A. S. Turcot, H. Fukui, P. Poffenberger, U. C. Dunwoody, H. G. Evans, B. Schmitt, M. A. Thomson, M. J. Goodrick, James Pinfold, P. A. Hart, Sven Menke, D. G. Fong, J. Gascon, M. J. Losty, D. R. Rust, D. Rigby, R. J. Hemingway, M. Tecchio, Robert M Brown, J. M. Roney, J. J. Ward, P. Vikas, Gideon Bella, K. Runge, P. Bock, H. J. Burckhart, J. G. Layter, Jacqueline Batley, M. Settles, Yoram Rozen, M. Foucher, P. Schütz, R. Giacomelli, I. Cohen, M. J. Pearce, D. Lanske, A. M. Lee, A. Malik, J. W. Gary, D. S. Koetke, C. Charlesworth, B. W. Kennedy, P. Jovanovic, J. Bechtluft, J. A. McKenna, Austin Ball, E. von Törne, J. von Krogh, A. Gaidot, T. Wlodek, Marcello Mannelli, J. E. Duboscq, M. Sproston, Peter Krieger, Manuella Vincter, R. J. Hawkings, L. A. del Pozo, C. Y. Chang, D. Karlen, C. Burgard, Alessandro Montanari, P. Taras, R. Mir, R. Howard, N. Tesch, T. Behnke, S. B. Anderson, Stefan Kluth, Shlomit Tarem, P. Szymanski, Michael Kobel, J. Lauber, P. Gagnon, C. J. Oram, Julie Kirk, H. Lafoux, S. G. Clowes, D. L. Rees, Stan Bentvelsen, M. Fierro, J. E.G. Edwards, F. Scharf, F. G. Oakham, G. T. Zorn, A. D. Schaile, E. L. Barberio, H. M. Bosch, Wolfram Dietrich Zeuner, A. Joly, M. F. Turner-Watson, M. Morii, M. W. Redmond, Peter R Hobson, P. Routenburg, John Allison, R. G. Kellogg, and Stefano Marcellini
Subjects: Quantum chromodynamics, Quark, Physics, Particle physics, Structure constants, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, High Energy Physics::Phenomenology, Observable, Jet (particle physics), Nuclear physics, Strong coupling, High Energy Physics::Experiment, Constant (mathematics), Engineering (miscellaneous), Event (particle physics), Particle Physics - Experiment
Abstract: The dependence of event shape cross sections on the QCD structure constantsCA,CF andTF is studied using data from the OPAL detector at LEP. The observables Thrust, Heavy Jet Mass, Total and Wide Jet Broadening are used. They allow the use ofO(αs2), resummed NLLA, and combinedO(αs2) plus resummed NLLA QCD calculations so that a comparison between the different approaches can be performed. The measured values of the structure constants are found to be consistent with standard QCD based on SU(3) and five active quark flavours. A measurement of the strong coupling constant using NLLA QCD calculations alone results in$\alpha _s (M_{Z^0 } ) = 0.113_{ - 0.008}^{ + 0.009}$, which complements our previous determinations.
Published: 1995

8. A study of b quark fragmentation into B0 and B+ mesons at LEP

Author: Theodoros Geralis, E. Ros, S. M. Gascon-Shotkin, J. Palinkas, T. P. Kokott, A. Luig, D. Rigby, R. J. Hemingway, H. Mes, I. P. Duerdoth, Shlomo Dado, P. Fath, A. M. Rossi, F. Wäckerle, B. W. Kennedy, D. M. Gingrich, P. Jovanovic, T. Behnke, J. Steuerer, Austin Ball, Peter Krieger, P. Berlich, Manuella Vincter, Alessandro Montanari, P. W. Jeffreys, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, Giora Mikenberg, U. Jost, R. Mir, Reda Tafirout, Madjid Boutemeur, P. Igo-Kemenes, B. C. Shen, D. Axen, I. J. Bloodworth, J. C. Clayton, P. Bright-Thomas, Dave Charlton, P. Poffenberger, H. Jeremie, P. G. Estabrooks, A. Jawahery, Marco Cuffiani, M. Settles, Siegfried Bethke, A. K. Honma, B. Nijjhar, J. J. Ward, W. Matthews, W. G. Scott, R. E. Hughes-Jones, Yoram Rozen, F. G. Oakham, P. Vikas, D. Lanske, T. J. McMahon, P. Schütz, Ehud Duchovni, M. A. Thomson, Peter Sherwood, E. L. Barberio, M. Foucher, Alexander Wagner, Paolo Giacomelli, P. M. Watkins, S. L. Chu, R. Bürgin, B. Fabbro, M. Hansroul, E. K. U. Gross, C. Dallapiccola, M. Jimack, A. Gaidot, W. R. Gibson, J. Ludwig, S. Braibant, E. Lefebvre, N. J. Oldershaw, Richard Keeler, K. Runge, P. Bock, J. D. Gillies, T. Wlodek, Junichi Kanzaki, T. Hilse, M. Sproston, D. Karlen, J. Schwiening, R. K. Carnegie, E. do Couto e Silva, N. I. Geddes, S. W. Gensler, F. S. Merrtt, R. D. Heuer, Dezso Horvath, Fabrizio Fabbri, C. Burgard, F. Odorici, O. Runolfsson, M. J. Losty, A. Beck, S. J. Hillier, P. Gagnon, N. Altekamp, J. A. Wilson, A. I. McNab, John Allison, R. Howard, Jean-Arcady Meyer, C. H. Shepherd-Themistocleous, T. Kobayashi, N. L. Rodning, Gideon Bella, R. J. Barlow, D. J. Miller, C. Beeston, Sven Menke, J. Goldberg, B. Poli, A. Sittler, Claudio Grandi, D. R. Rust, J. P. Pansart, R. J. Homer, O. Schaile, R. W. Springer, R. G. Kellogg, Silvia Arcelli, B. Nellen, G. A. Snow, C. P. Ward, S. Söldner-Rembold, H. J. Burckhart, Jacqueline Batley, T. Tsukamoto, N. Tesch, N. K. Watson, H. M. Fischer, M. Starks, A. J. Martin, H. M. Bosch, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, G. A. Beck, C. Darling, T. J. Smith, Achim Stahl, A. M. Lee, Csaba Hajdu, Stefano Marcellini, E. A. Mckigney, A. Michelini, P. S. Wells, M. Tecchio, E. von Törne, S. W. O'Neale, O. C. Cooke, G. W. Wilson, K. J. Anderson, M. Hauschild, Georges Azuelos, P. Mättig, Stephen Lloyd, E. Tsur, J. Lauber, Terry Richard Wyatt, W. P. Lai, Frank Fiedler, D. Hochman, S. G. Clowes, M. Fierro, Shoji Asai, B. Schmitt, S. A. Robins, Robert M Brown, C. Markus, K. W. Bell, J. E.G. Edwards, C. Hartmann, D. E. Plane, K. Stephens, J. Bechtluft, J. A. McKenna, C. Y. Chang, Misao Sasaki, C. M. Hawkes, Margret Fincke-Keeler, Daniel Lellouch, A. Joly, R. Kowalewski, J. M. Roney, W. Mohr, G. M. Dallavalle, P. Taras, A. Posthaus, J. von Krogh, F. Strumia, Michael Kobel, Takehiko Mori, E. H. Vokurka, K. Ametewee, R. J. Hawkings, V. Gibson, H. G. Evans, Gideon Alexander, Paolo Capiluppi, B. Stockhausen, Paul Kyberd, V. Zacek, F. K. Loebinger, L. A. del Pozo, C. Sbarra, Alan Watson, R. Bartoldus, D. M. Strom, M. J. Goodrick, C. Stegmann, Julie Kirk, H. Fukui, Joleen Pater, I. Cohen, D. L. Rees, D. R. Ward, T. Kress, R. Rylko, H. O. Ogren, Christoph Geich-Gimbel, G. Yekutieli, F. Scharf, R. Giacomelli, German Martinez, Gregor Herten, B. Wilkens, A. D. Schaile, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, M. G. Rison, F. X. Gentit, J. E. Conboy, A. Fürtjes, Gunter Wolf, J. E. Pilcher, S. Wotton, Stefan Kluth, Shlomit Tarem, Tara Shears, U. C. Dunwoody, C. J. Oram, P. A. Hart, M. J. Pearce, U. Müller, Otmar Biebel, C. K. Hargrove, Matthias Schröder, D. L. Wagner, H. Lafoux, H. Deng, J. Letts, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, M. Rosvick, M. Hapke, D. E. Hutchcroft, M. J. Oreglia, J. R. Carter, G. N. Patrick, S. B. Anderson, P. Szymanski, Stan Bentvelsen, Andris Skuja, G. D. Long, Tetsuro Mashimo, W. Gorn, A. S. Turcot, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, Hans-Christian Schultz-Coulon, James Pinfold, Randall Sobie, Michael Schulz, G. D. Lafferty, D. G. Fong, C. Lewis, J. Gascon, T. W. Pritchard, A. Malik, J. W. Gary, Guenter Duckeck, D. S. Koetke, Marcello Mannelli, G. G. Hanson, G. Giacomelli, P. Schenk, M. S. Dixit, Frans Meijers, J. G. Layter, R. Lahmann, C. Charlesworth, D. C. Imrie, M. Palazzo, Stefania Xella, P. E.L. Clarke, M. K. Jones, G. P. Siroli, J. P. Martin, M. Tscheulin, John Hill, S. De Jong, J. King, H. Przysiezniak, Kiyotomo Kawagoe, P. Weber, R. Van Kooten, and Sachio Komamiya
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Electron–positron annihilation, High Energy Physics::Phenomenology, Bottom quark, Nuclear physics, Fragmentation (mass spectrometry), Mass spectrum, High Energy Physics::Experiment, B meson, Nuclear Experiment, Particle Physics - Experiment, Free parameter
Abstract: A study of b quark fragmentation at LEP is presented using a sample of semileptonic B decays containing a fully reconstructed charm meson. The data are compared to several theoretical models for heavy quark fragmentation; the free parameters in these models are fitted and the sensitivity of the model parameters to the rate of P-wave B meson production is studied. The mean scaled energy fraction of B 0 and B + mesons has been determined to be x E > = 0.695 ± 0.006 ± 0.003 ± 0.007, where the errors are statistical, systematic and model dependence respectively. This result is consistent with previous, less direct measurements from inclusive leptonic B decays. Also presented is a model independent fit to the shape of the energy distribution of weakly decaying B mesons at LEP.
Published: 1995

9. A comparison of b and uds quark jets to gluon jets

Author: C. M. Hawkes, N. J. Oldershaw, P. Gagnon, Daniel Lellouch, C. Dallapiccola, M. Hapke, E. Lefebvre, Takehiko Mori, John Allison, J. D. Gillies, A. Sittler, A. I. McNab, O. Schaile, R. G. Kellogg, F. Odorici, Csaba Hajdu, Stefano Marcellini, D. E. Hutchcroft, J. Goldberg, V. Zacek, B. Nellen, W. Matthews, H. M. Bosch, N. Altekamp, B. C. Shen, M. Starks, J. Palinkas, B. Stockhausen, Paul Kyberd, F. K. Loebinger, J. Lauber, A. Joly, R. J. Barlow, Siegfried Bethke, M. A. Thomson, M. J. Oreglia, P. Poffenberger, Joleen Pater, A. K. Honma, B. Nijjhar, W. G. Scott, R. Giacomelli, D. J. Miller, Silvia Arcelli, H. G. Evans, M. J. Goodrick, F. Strumia, K. Stephens, R. Kowalewski, Shlomo Dado, Gregor Herten, I. Cohen, P. Schütz, T. Wlodek, J. R. Carter, M. Sproston, I. J. Bloodworth, R. Howard, B. Wilkens, A. Gaidot, U. Müller, J. Bechtluft, G. N. Patrick, Gunter Wolf, F. X. Gentit, P. Igo-Kemenes, M. Settles, H. Jeremie, M. F. Turner-Watson, M. Morii, Dezso Horvath, M. J. Losty, J. P. Pansart, S. G. Clowes, Yoram Rozen, J. E. Pilcher, H. Mes, I. P. Duerdoth, Peter R Hobson, T. Tsukamoto, M. Foucher, Otmar Biebel, N. Tesch, R. E. Hughes-Jones, M. Fierro, V. Gibson, N. I. Geddes, A. J. Martin, Jean-Arcady Meyer, T. Kobayashi, J. E.G. Edwards, D. L. Wagner, F. S. Merritt, D. Rigby, R. J. Hemingway, P. Fath, Junichi Kanzaki, S. Wotton, R. D. Heuer, P. Routenburg, D. Karlen, C. Burgard, Fabrizio Fabbri, T. Behnke, N. L. Rodning, C. Y. Chang, Sachio Komamiya, Theodoros Geralis, B. W. Kennedy, E. A. Mckigney, W. R. Gibson, P. W. Jeffreys, J. Steuerer, G. W. Wilson, D. Axen, A. Jawahery, M. Hauschild, H. Deng, P. Jovanovic, E. do Couto e Silva, E. Ros, A. T. Watson, P. Taras, Michael Kobel, Austin Ball, Eilam Gross, N. K. Watson, B. Poli, C. Darling, Peter Sherwood, W. P. Lai, J. G. Layter, Giora Mikenberg, Dave Charlton, G. A. Beck, C. Markus, Achim Stahl, T. J. Smith, C. K. Hargrove, Peter Krieger, R. Van Kooten, Matthias Schröder, J. Letts, Stefan Kluth, Shlomit Tarem, D. R. Ward, Alexander Wagner, H. Lafoux, T. Kress, R. W. Springer, R. Lahmann, P. Mättig, Shoji Asai, D. C. Imrie, M. Palazzo, J. Ludwig, Julie Kirk, T. P. Kokott, A. Luig, E. H. Vokurka, A. Beck, Sven Menke, J. M. Roney, Norbert Wermes, Sherry Towers, T. Kawamoto, Manuella Vincter, Alessandro Montanari, J. C. Clayton, U. Jost, P. Bright-Thomas, B. Schmitt, P. S. Wells, R. Mir, S. M. Gascon-Shotkin, R. Bürgin, B. Fabbro, C. J. Oram, S. Braibant, J. A. McKenna, Margret Fincke-Keeler, C. Charlesworth, Georges Azuelos, J. J. Ward, P. Vikas, Terry Richard Wyatt, Lorne Levinson, P. D. Phillips, Hans-Christian Schultz-Coulon, E. Tsur, G. P. Siroli, J. King, Marco Cuffiani, D. Lanske, Gilles Beaudoin, S. L. Chu, G. Giacomelli, S. Orito, M. Rosvick, F. Wäckerle, D. M. Gingrich, K. W. Bell, S. W. O'Neale, A. Skillman, K. J. Anderson, Randall Sobie, Gideon Bella, Madjid Boutemeur, Tara Shears, U. C. Dunwoody, P. A. Hart, Stefania Xella, J. C. Hill, R. Bartoldus, Michael Schulz, G. D. Lafferty, H. J. Burckhart, Jacqueline Batley, K. Runge, Misao Sasaki, M. J. Pearce, C. Hartmann, D. E. Plane, H. O. Ogren, Christoph Geich-Gimbel, Kiyotomo Kawagoe, W. Mohr, A. M. Rossi, G. A. Snow, C. P. Ward, P. G. Estabrooks, R. K. Keeler, P. Berlich, P. Bock, F. G. Oakham, G. M. Dallavalle, P. E.L. Clarke, T. Hilse, O. Runolfsson, M. K. Jones, E. L. Barberio, S. Söldner-Rembold, H. M. Fischer, A. Posthaus, D. R. Rust, J. P. Martin, P. Weber, A. Michelini, D. M. Strom, T. W. Pritchard, P. M. Watkins, M. Tscheulin, J. E. Conboy, C. Stegmann, A. Fürtjes, S. De Jong, Paolo Giacomelli, Reda Tafirout, M. Hansroul, S. A. Robins, Guenter Duckeck, H. Fukui, C. Beeston, A. M. Lee, Claudio Grandi, R. Rylko, M. Tecchio, E. von Törne, C. H. Shepherd-Themistocleous, H. Przysiezniak, R. J. Homer, S. B. Anderson, P. Szymanski, Frank Fiedler, D. Hochman, D. L. Rees, F. Scharf, German Martinez, G. G. Hanson, Stan Bentvelsen, A. D. Schaile, P. Schenk, M. S. Dixit, Frans Meijers, A. S. Turcot, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, M. Jimack, S. W. Gensler, S. J. Hillier, Stephen Lloyd, Robert M Brown, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, James Pinfold, D. G. Fong, C. Lewis, J. Gascon, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, Andris Skuja, G. D. Long, Tetsuro Mashimo, W. Gorn, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, C. Sbarra, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, B. J. King, P. Utzat, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, and J. A. Wilson
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Lattice, Astrophysics::High Energy Astrophysical Phenomena, Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Bottom quark, Charged particle, Gluon, Vertex (geometry), Nuclear physics, High Energy Physics::Experiment, Impact parameter, Nuclear Experiment, Particle Physics - Experiment
Abstract: Symmetric three-jet events are selected from hadronic Z0 decays such that the two lower energy jets are each produced at an angle of about 150° with respect to the highest energy jet. In some cases, a displaced secondary vertex is reconstructed in one of the two lower energy jets, which permits the other lower energy jet to be identified as a gluon jet through anti-tagging. In other cases, the highest energy jet is tagged as a b jet or as a light quark (uds) jet using secondary vertex or track impact parameter and momentum information. Comparing the two lower energy jets of the events with a tag in the highest energy jet to the anti-tagged gluon jets yields a direct comparison of b, uds and gluon jets, which are produced with the same energy of about 24 GeV and under the same conditions. We observe b jets and gluon jets to have similar properties as measured by the angular distribution of particle energy around the jet directions and by the fragmentation functions. In contrast, gluon jets are found to be significantly broader and to have a markedly softer fragmentation function than uds jets. For thek ⊥ jet finder withy cut=0.02, we find $$\begin{gathered} \frac{{\left\langle {n^{ch.} } \right\rangle gluon}}{{\left\langle {n^{ch.} } \right\rangle b quark}} = 1.089 \pm 0.024(stat.) \pm 0.024(syst.) \hfill \\ \frac{{\left\langle {n^{ch.} } \right\rangle gluon}}{{\left\langle {n^{ch.} } \right\rangle uds quark}} = 1.390 \pm 0.038(stat.) \pm 0.032(syst.) \hfill \\ \end{gathered} $$ as the ratios of the mean charged particle multiplicity in the gluon jets compared to the b and uds jets. Results are also reported using the cone jet finder.
Published: 1995

10. A measurement of the forward-backward asymmetry of e+e−→bb by applying a jet charge algorithm to lifetime tagged events

Author: H. O. Ogren, F. S. Merritt, Christoph Geich-Gimbel, J. A. McKenna, Silvia Arcelli, F. X. Gentit, J. E. Conboy, A. Fürtjes, Andris Skuja, M. Fanti, Tara Shears, Margret Fincke-Keeler, N. J. Oldershaw, John Allison, Sachio Komamiya, M. Hapke, G. D. Long, U. C. Dunwoody, P. A. Hart, Theodoros Geralis, E. Ros, A. T. Watson, C. M. Hawkes, Daniel Lellouch, S. Braibant, D. E. Hutchcroft, P. E.L. Clarke, M. K. Jones, Takehiko Mori, P. S. Wells, Tetsuro Mashimo, T. Hilse, H. M. Fischer, T. J. Smith, Terry Richard Wyatt, E. A. Mckigney, W. P. Lai, P. Igo-Kemenes, W. Matthews, H. Mes, I. P. Duerdoth, R.J. Akers, O. Schaile, J. P. Martin, R. G. Kellogg, J. Steuerer, M. J. Pearce, Gideon Bella, O. Runolfsson, P. Fath, R. D. Heuer, K. Stephens, J. M. Roney, Fabrizio Fabbri, H. Jeremie, M. J. Oreglia, Eilam Gross, M. Tscheulin, S. De Jong, A. Michelini, T. Behnke, Stefano Marcellini, R. E. Hughes-Jones, G. A. Snow, C. P. Ward, V. Zacek, T. J. McMahon, M. Starks, J. Schwiening, M. A. Thomson, Stefan Kluth, Shlomit Tarem, C. Beeston, T. P. Kokott, A. Luig, D. Rigby, R. J. Hemingway, H. J. Burckhart, Claudio Grandi, Madjid Boutemeur, A. Buijs, D. R. Rust, A. J. Martin, S. Söldner-Rembold, W. Gorn, R. K. Carnegie, S. W. O'Neale, R. W. Springer, D. M. Strom, C. Stegmann, Jacqueline Batley, A. Gaidot, P. W. Jeffreys, G. A. Beck, Achim Stahl, A. S. Turcot, C. J. Oram, T. Wlodek, P. G. Estabrooks, M. Sproston, K. J. Anderson, R. K. Keeler, H. Fukui, B. Stockhausen, Paul Kyberd, F. K. Loebinger, W. R. Gibson, B. W. Kennedy, A. M. Lee, E. do Couto e Silva, D. Axen, I. J. Bloodworth, A. Jawahery, P. Jovanovic, E. von Törne, P. Bright-Thomas, P. M. Watkins, Austin Ball, Gunter Wolf, J. R. Carter, G. N. Patrick, J. A. Wilson, Peter Sherwood, H. Przysiezniak, S. A. Robins, Peter Krieger, Gregor Herten, V. Gibson, Otmar Biebel, C. Y. Chang, J. J. Ward, M. Settles, P. Scharff-Hansen, Alexander Wagner, T. Tsukamoto, P. Vikas, R. Giacomelli, Sven Menke, D. Lanske, D. L. Wagner, B. Schmitt, N. Tesch, B. Wilkens, Shlomo Dado, J. Ludwig, Yoram Rozen, S. Wotton, Manuella Vincter, K. Runge, P. Bock, Marco Cuffiani, E. Lefebvre, R. Van Kooten, Kiyotomo Kawagoe, Alessandro Montanari, P. Taras, Michael Kobel, J. Bechtluft, M. Foucher, U. Müller, H. Deng, M. F. Turner-Watson, N. K. Watson, F. Odorici, R. Mir, P. Gagnon, Xinchou Lou, M. Morii, J. E. Pilcher, R. Howard, A. Beck, A. I. McNab, J. Goldberg, Peter R Hobson, Georges Azuelos, P. Weber, F. Wäckerle, J. P. Pansart, A. M. Smith, C. Sbarra, Julie Kirk, Giora Mikenberg, P. Routenburg, B. Nellen, D. M. Gingrich, Junichi Kanzaki, D. Karlen, J. Lauber, S. G. Clowes, M. Fierro, J. E.G. Edwards, J. Letts, D. R. Ward, T. Kress, H. Lafoux, G. W. Wilson, S. L. Chu, M. Hauschild, C. Burgard, G. T. Zorn, G. Vasseur, B. Lorazo, Paolo Giacomelli, A. Joly, Norbert Wermes, Sherry Towers, T. Kawamoto, C. Markus, P. Berlich, W. Mohr, R. Lahmann, M. Hansroul, G. Yekutieli, H. M. Bosch, Wolfram Dietrich Zeuner, F. G. Oakham, P. Poffenberger, K. W. Bell, H. G. Evans, A. Posthaus, Dave Charlton, D. C. Imrie, M. J. Goodrick, I. Cohen, S. Orito, James Pinfold, M. Rosvick, E. L. Barberio, D. G. Fong, J. Gascon, A. A. Carter, Ron Folman, C. Darling, J. C. Hill, N. I. Geddes, Misao Sasaki, C. H. Shepherd-Themistocleous, R. Bürgin, G. G. Hanson, M. W. Redmond, G. P. Siroli, J. King, C. Dallapiccola, Roger Jones, P. Schütz, P. Texeira-Dias, B. Fabbro, Lorne Levinson, P. D. Phillips, J. D. Gillies, B. J. King, R. J. Homer, P. Mättig, B. C. Shen, N. L. Rodning, Frank Fiedler, G. Giacomelli, B. Poli, Shoji Asai, P. Utzat, N. Altekamp, D. Hochman, C. K. Hargrove, Siegfried Bethke, A. K. Honma, B. Nijjhar, M. G. Rison, W. G. Scott, R. J. Barlow, D. L. Rees, D. J. Miller, J. C. Clayton, Matthias Schröder, P. Schenk, Gilles Beaudoin, A. Skillman, F. Scharf, M. S. Dixit, M. J. Losty, Frans Meijers, A. M. Rossi, J. G. Layter, Hans-Christian Schultz-Coulon, A. D. Schaile, C. Hartmann, D. E. Plane, C. Charlesworth, G. M. Dallavalle, Randall Sobie, Michael Schulz, G. D. Lafferty, Reda Tafirout, T. W. Pritchard, Guenter Duckeck, S. B. Anderson, P. Szymanski, Stan Bentvelsen, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Stephen Lloyd, M. Tecchio, Robert M Brown, A. Malik, J. W. Gary, D. S. Koetke, Ehud Duchovni, Marcello Mannelli, J. E. Duboscq, M. Jimack, F. Palmonari, S. W. Gensler, S. J. Hillier, T. Kobayashi, O. C. Cooke, J. von Krogh, R. J. Hawkings, L. A. del Pozo, and R. Bartoldus
Subjects: Physics, Quark, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Charge (physics), Jet (particle physics), Asymmetry, Standard Model, Nuclear physics, Higgs boson, Engineering (miscellaneous), Algorithm, Energy (signal processing), media_common, Bar (unit)
Abstract: The forward-backward asymmetry of$e^ + e^ - \to Z^0 \to b\bar b$ has been measured using approximately 2.15 million hadronicZ0 decays collected at the LEP e+e− collider with the OPAL detector. A lifetime tag technique was used to select an enriched$b\bar b$ event sample. The measurement of the$b\bar b$ asymmetry was then performed using a jet charge algorithm to determine the direction of the primary quark. Values of: $$\begin{gathered} A_{FB}^b = 0.062 \pm 0.034 \pm 0.002 - 0.082\Delta (\Gamma _{b\bar b} /\Gamma _{had} ) \hfill \\ at\sqrt s = 89.52GeV, \hfill \\ A_{FB}^b = 0.0963 \pm 0.0067 \pm 0.0038 - 0.471\Delta (\Gamma _{b\bar b} /\Gamma _{had} ) \hfill \\ at\sqrt s = 91.25GeV, \hfill \\ A_{FB}^b = 0.172 \pm 0.028 \pm 0.007 - 0.055\Delta (\Gamma _{b\bar b} /\Gamma _{had} ) \hfill \\ at\sqrt s = 92.94GeV, \hfill \\ \end{gathered}$$ were measured where, in each case, the first error is statistical, the second is systematic and the third term gives the variation due to a change$\Delta (\Gamma _{b\bar b} /\Gamma _{had} )$ in the value of$\Gamma _{b\bar b} /\Gamma _{had} = 0.216$ assumed. The dependence on the assumed charm asymmetry at the same energy is Δ(AFBb)≈+0.07Δ(AFBc). Assuming the Standard Model form for the couplings, these measurements correspond to an effective weak mixing angle of: $$\sin ^2 \theta _W^{eff,e} = 0.2313 \pm 0.0012 \pm 0.0006$$ giving Mtop=196−38−19+33+16GeV/c2, where the first error is statistical and the second is systematic. The Higgs mass assumed is 300 GeV/c2. A variation in the assumed mass of the Higgs boson between 60 and 1000 GeV/c2 corresponds to an uncertainty in sin2θWeff,e of ±0.00006 and on Mtop of−26+20GeV/c2.
Published: 1995

11. Δ++ production in hadronic Z0 decays

Author: W. R. Gibson, H. J. Burckhart, Jacqueline Batley, S. Braibant, A. Beck, U. Jost, R. Mir, Andris Skuja, G. D. Long, A. I. McNab, J. Goldberg, D. Rigby, R. J. Hemingway, R. M. Brown, Lorne Levinson, P. D. Phillips, B. W. Kennedy, G. W. Wilson, P. Jovanovic, M. Hauschild, Austin Ball, C. Markus, Peter Krieger, Paolo Giacomelli, M. Hansroul, Manuella Vincter, Alessandro Montanari, Gilles Beaudoin, F. G. Oakham, Tetsuro Mashimo, B. Nellen, D. Axen, A. Jawahery, E. H. Vokurka, A. Skillman, E. L. Barberio, N. I. Geddes, B. Stockhausen, Paul Kyberd, F. K. Loebinger, C. H. Shepherd-Themistocleous, R. Lahmann, D. C. Imrie, M. Palazzo, Peter Sherwood, C. Dallapiccola, F. S. Merritt, C. Hartmann, D. E. Plane, J. D. Gillies, N. L. Rodning, R. J. Homer, N. Altekamp, W. Gorn, N. J. Oldershaw, U. Müller, G. P. Siroli, J. King, R. J. Barlow, H. G. Evans, M. J. Goodrick, Silvia Arcelli, D. J. Miller, Joleen Pater, G. M. Dallavalle, Stephen Lloyd, B. Poli, J. Ludwig, G. A. Snow, C. P. Ward, K. Runge, P. Bock, W. Matthews, P. Igo-Kemenes, H. Mes, I. Cohen, I. P. Duerdoth, R. Giacomelli, C. Darling, O. Schaile, H. Jeremie, J. Lauber, M. A. Thomson, J. Bechtluft, Dave Charlton, P. Fath, Margret Fincke-Keeler, J. A. McKenna, R. Kowalewski, S. B. Anderson, P. Szymanski, R. E. Hughes-Jones, Frank Fiedler, D. Hochman, S. Söldner-Rembold, R. Van Kooten, P. S. Wells, P. Scharff-Hansen, S. M. Gascon-Shotkin, Kiyotomo Kawagoe, T. J. McMahon, G. G. Hanson, E. K. U. Gross, F. Strumia, T. J. Smith, K. Stephens, A. Gaidot, P. Mättig, K. Ametewee, Shoji Asai, T. Wlodek, J. Schwiening, M. Sproston, Terry Richard Wyatt, Gideon Alexander, Stefan Kluth, R. Bürgin, B. Fabbro, Paolo Capiluppi, M. Starks, A. J. Martin, Reda Tafirout, R. Bartoldus, R. K. Carnegie, E. A. Mckigney, Shlomit Tarem, C. M. Hawkes, C. K. Hargrove, Daniel Lellouch, P. Weber, A. M. Smith, T. Tsukamoto, N. Tesch, Takehiko Mori, H. O. Ogren, V. Gibson, Christoph Geich-Gimbel, Matthias Schröder, G. Giacomelli, Stan Bentvelsen, E. do Couto e Silva, A. Joly, C. J. Oram, J. A. Wilson, G. Vasseur, P. Schenk, B. Lorazo, Ehud Duchovni, S. L. Chu, V. Zacek, N. K. Watson, F. Wäckerle, A. M. Rossi, M. Jimack, P. Gagnon, D. R. Ward, T. Kress, D. M. Gingrich, Sven Menke, W. P. Lai, H. Lafoux, J. C. Clayton, H. M. Fischer, John Allison, J. Palinkas, S. W. Gensler, A. S. Turcot, F. X. Gentit, S. J. Hillier, T. Kobayashi, P. Berlich, M. S. Dixit, Gregor Herten, Frans Meijers, A. Sittler, J. E. Conboy, A. Fürtjes, James Pinfold, Gunter Wolf, D. G. Fong, C. Lewis, J. Gascon, Shlomo Dado, E. Lefebvre, A. Michelini, R. Howard, P. E.L. Clarke, W. Mohr, B. Wilkens, D. R. Rust, J. P. Pansart, A. Wagne, G. A. Beck, Achim Stahl, R. G. Kellogg, H. M. Bosch, A. Posthaus, I. J. Bloodworth, O. C. Cooke, Csaba Hajdu, S. A. Robins, M. K. Jones, J. P. Martin, F. Odorici, Stefano Marcellini, A. M. Lee, M. Tscheulin, J. E. Pilcher, J. M. Roney, M. Tecchio, E. von Törne, A. Malik, S. De Jong, J. W. Gary, D. S. Koetke, B. Schmitt, D. M. Strom, Hans-Christian Schultz-Coulon, C. Stegmann, Tara Shears, J. von Krogh, Giora Mikenberg, H. Fukui, M. Settles, Randall Sobie, Michael Schulz, G. D. Lafferty, R. Rylko, Yoram Rozen, U. C. Dunwoody, P. A. Hart, D. L. Rees, Marcello Mannelli, T. W. Pritchard, S. Wotton, M. J. Pearce, Guenter Duckeck, F. Scharf, German Martinez, R. J. Hawkings, R. D. Heuer, Fabrizio Fabbri, M. Foucher, A. D. Schaile, H. Przysiezniak, T. Behnke, J. Steuerer, L. A. del Pozo, C. Sbarra, Madjid Boutemeur, Junichi Kanzaki, D. Karlen, C. Burgard, G. Yekutieli, J. G. Layter, Marco Cuffiani, A. A. Carter, Ron Folman, C. Charlesworth, Roger Jones, P. G. Estabrooks, R. K. Keeler, B. J. King, P. Utzat, Stefania Xella, M. G. Rison, P. M. Watkins, Otmar Biebel, D. L. Wagner, H. Deng, J. Letts, Norbert Wermes, Sherry Towers, T. Kawamoto, R. W. Springer, Georges Azuelos, E. Tsur, S. Orito, M. Rosvick, K. W. Bell, J. C. Hill, Misao Sasaki, M. Hapke, B. C. Shen, Siegfried Bethke, A. K. Honma, B. Nijjhar, D. E. Hutchcroft, W. G. Scott, M. J. Oreglia, J. R. Carter, Dezso Horvath, G. N. Patrick, M. J. Losty, Jean-Arcady Meyer, P. Poffenberger, P. Schütz, S. G. Clowes, M. Fierro, J. E.G. Edwards, C. Y. Chang, P. W. Jeffreys, P. Taras, Michael Kobel, P. Bright-Thomas, J. J. Ward, P. Vikas, D. Lanske, Julie Kirk, T. Hilse, O. Runolfsson, C. Beeston, Claudio Grandi, S. W. O'Neale, K. J. Anderson, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, T. P. Kokott, A. Luig, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, and Gideon Bella
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Monte Carlo method, Hadron, Astrophysics::Cosmology and Extragalactic Astrophysics, Strangeness, Nuclear physics, Baryon, Fragmentation function, High Energy Physics::Experiment, Nuclear Experiment, Production rate
Abstract: The production of Δ++ baryons has been measured using 3.5 million hadronic Z0 decays collected with the OPAL detector at LEP. The production rate and fragmentation function are presented. A total of 0.22 ± 0.04 ± 0.04 Δ ++ + ( Δ ) −− per hadronic Z0 decay is observed. The fragmentation function is found to be softer than that predicted by the JETSET and HERWIG Monte Carlo event generators. With this measurement of Δ++ production, at least one baryon of each strangeness level in the lightest baryon decuplet has now been measured at LEP.
Published: 1995

12. Measurement of the multiplicity of charm quark pairs from gluons in hadronic Z0 Decays

Author: Sachio Komamiya, T. Hilse, John Allison, O. Runolfsson, Theodoros Geralis, E. Ros, D. R. Rust, Madjid Boutemeur, C. Beeston, Claudio Grandi, R. W. Springer, T. P. Kokott, A. Luig, A. M. Lee, P. G. Estabrooks, R. G. Kellogg, Gregor Herten, P. W. Jeffreys, E. von Törne, C. M. Hawkes, Stefano Marcellini, Daniel Lellouch, S. Braibant, Takehiko Mori, Tara Shears, P. Bright-Thomas, B. Wilkens, P. M. Watkins, Georges Azuelos, J. Steuerer, J. J. Ward, P. Vikas, C. Sbarra, D. Lanske, S. G. Clowes, M. Fierro, Reda Tafirout, U. C. Dunwoody, V. Zacek, P. A. Hart, Gideon Bella, R. Bartoldus, K. W. Bell, A. Joly, H. J. Burckhart, Jacqueline Batley, Eilam Gross, M. Fanti, J. E. Pilcher, M. J. Pearce, H. O. Ogren, M. W. Redmond, Misao Sasaki, Silvia Arcelli, Christoph Geich-Gimbel, G. Yekutieli, R. Mir, G. A. Snow, C. P. Ward, A. I. McNab, M. Hapke, T. Behnke, I. J. Bloodworth, W. R. Gibson, J. Goldberg, G. W. Wilson, M. Hauschild, G. A. Beck, P. Igo-Kemenes, D. E. Hutchcroft, B. Stockhausen, Paul Kyberd, A. A. Carter, J. Lauber, S. Söldner-Rembold, Richard Keeler, F. K. Loebinger, Achim Stahl, Ron Folman, Roger Jones, P. Teixeira-Dias, B. C. Shen, H. Jeremie, U. Müller, Marco Cuffiani, F. X. Gentit, B. J. King, P. Utzat, M. Settles, Yoram Rozen, M. J. Oreglia, C. Markus, R. E. Hughes-Jones, B. Nellen, P. Gagnon, A. Beck, M. G. Rison, S. L. Chu, M. Foucher, M. F. Turner-Watson, M. Morii, Peter R Hobson, J. G. Layter, B. Schmitt, E. A. Mckigney, F. G. Oakham, W. P. Lai, R. Howard, R. Giacomelli, J. E.C. Edwards, R. D. Heuer, O. C. Cooke, Lorne Levinson, P. D. Phillips, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, J. E. Conboy, A. Fürtjes, J. P. Pansart, E. L. Barberio, N. J. Oldershaw, P. Routenburg, G. T. Zorn, Junichi Kanzaki, E. do Couto e Silva, D. Karlen, C. Burgard, R.J. Akers, C. Charlesworth, M. J. Losty, H. M. Bosch, Wolfram Dietrich Zeuner, Gilles Beaudoin, A. Skillman, C. K. Hargrove, Matthias Schröder, Fabrizio Fabbri, C. Dallapiccola, Shlomo Dado, S. B. Anderson, P. Szymanski, J. von Krogh, H. G. Evans, M. J. Goodrick, J. R. Carter, S. W. O'Neale, G. N. Patrick, I. Cohen, K. J. Anderson, F. S. Merritt, R. Van Kooten, Paolo Giacomelli, M. Hansroul, Dave Charlton, J. M. Roney, O. Schaile, J. D. Gillies, R. J. Hawkings, D. Axen, A. Jawahery, C. Hartmann, Sven Menke, D. E. Plane, Otmar Biebel, Gunter Wolf, A. Buijs, C. Darling, Peter Sherwood, T. J. Smith, M. Starks, A. J. Martin, L. A. del Pozo, D. M. Strom, C. Stegmann, Stan Bentvelsen, C. H. Shepherd-Themistocleous, Alexander Wagner, T. J. McMahon, N. Altekamp, D. L. Wagner, G. M. Dallavalle, J. Bechtluft, J. A. McKenna, J. Ludwig, K. Runge, P. Bock, Giora Mikenberg, R. Bürgin, B. Fabbro, P. Mättig, J. Schwiening, R. J. Homer, R. K. Carnegie, G. G. Hanson, P. Poffenberger, Shoji Asai, H. Fukui, Margret Fincke-Keeler, R. J. Barlow, J. A. Wilson, R. Lahmann, Hans-Christian Schultz-Coulon, F. Wäckerle, D. J. Miller, Randall Sobie, Michael Schulz, G. D. Lafferty, D. C. Imrie, Alan Watson, S. Wotton, D. M. Gingrich, G. Giacomelli, H. Deng, T. W. Pritchard, P. Schütz, Guenter Duckeck, G. P. Siroli, J. King, P. Schenk, P. Berlich, A. S. Turcot, D. Rigby, R. J. Hemingway, M. S. Dixit, Frans Meijers, C. Y. Chang, J. Letts, P. S. Wells, B. W. Kennedy, P. Taras, Norbert Wermes, Michael Kobel, P. Jovanovic, P. E.L. Clarke, M. K. Jones, Terry Richard Wyatt, Sherry Towers, T. Kawamoto, Stefan Kluth, Shlomit Tarem, J. P. Martin, Austin Ball, M. Tscheulin, John Hill, S. De Jong, Julie Kirk, H. Lafoux, S. Orito, M. Rosvick, S. M. Gascon-Shotkin, Peter Krieger, Kiyotomo Kawagoe, H. Przysiezniak, Alessandro Montanari, A. M. Rossi, C. J. Oram, N. I. Geddes, N. L. Rodning, P. Weber, B. Poli, H. M. Fischer, A. Michelini, K. Stephens, S. A. Robins, V. Gibson, D. R. Ward, T. Kress, J. C. Clayton, Frank Fiedler, D. Hochman, R. Kowalewski, James Pinfold, D. G. Fong, J. Gascon, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, Andris Skuja, G. D. Long, Tetsuro Mashimo, W. Gorn, P. Scharff-Hansen, A. M. Smith, G. Vasseur, B. Lorazo, K. Ametewee, P. Vincter, Gideon Alexander, Paolo Capiluppi, Stephen Lloyd, M. Tecchio, Robert M Brown, Ehud Duchovni, M. Jimack, F. Palmonari, S. W. Gensler, S. J. Hillier, T. Kobayashi, H. Mes, I. P. Duerdoth, P. Fath, E. Lefebvre, N. K. Watson, F. Odorici, W. Mohr, A. Posthaus, D. L. Rees, F. Scharf, A. D. Schaile, W. Matthews, M. A. Thomson, A. Gaidot, T. Wlodek, M. Sproston, T. Tsukamoto, and N. Tesch
Subjects: Quark, Physics, Nuclear and High Energy Physics, Particle physics, High Energy Physics::Lattice, Electron–positron annihilation, Nuclear Theory, High Energy Physics::Phenomenology, Hadron, Jet (particle physics), Charm quark, Gluon, Nuclear physics, Pair production, High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment, Lepton
Abstract: We have measured the multiplicity of charm quark pairs arising from gluon splitting in a sample of about 3.5 million hadronic Z0 decays. By selecting a 3-jet event topology and tagging charmed hadrons in the lowest energy jet using leptons, we established a signature of heavy quark pair production from gluons. The average number of gluons splitting into a c c pair per hadronic event was measured to be n g→c c =(2.27±0.28±0.41) × 10 −2 .
Published: 1995

13. A measurement of the Λ0 lifetime

Author: P. Scharff-Hansen, P. Igo-Kemenes, Richard Keeler, S. L. Chu, H. Jeremie, R. E. Hughes-Jones, A. M. Smith, Sachio Komamiya, Theodoros Geralis, E. Ros, G. Vasseur, B. Lorazo, H. Mes, I. P. Duerdoth, P. Fath, J. P. Martin, D. Rigby, R. J. Hemingway, Christopher Hawkes, E. Lefebvre, James Pilcher, T. Hilse, E. do Couto e Silva, Kiyotomo Kawagoe, R. Howard, F. Odorici, B. W. Kennedy, P. Jovanovic, John Wilson, Austin Ball, T. P. Kokott, Carla Sbarra, A. Luig, D. R. Rust, J. P. Pansart, J. Ludwig, M. Hapke, Peter Krieger, Hans-Christian Schultz-Coulon, O. Runolfsson, Manuella Vincter, Alessandro Montanari, J. R. Batley, Randall Sobie, Michael Schulz, G. D. Lafferty, G. W. Wilson, D. E. Hutchcroft, A. Joly, James Pinfold, G. Yekutieli, P. Weber, D. G. Fong, R. W. Springer, A. M. Lee, Sven Menke, M. Hauschild, Tara Shears, J. Gascon, Takashi Kobayashi, C. Beeston, A. Jawahery, J. Bechtluft, Ron Folman, J. A. McKenna, T. W. Pritchard, Roger Jones, E. von Törne, R. Mir, M. W. Redmond, C. Markus, P. E.L. Clarke, W. G. Scott, U. C. Dunwoody, Claudio Grandi, B. J. King, M. K. Jones, Guenter Duckeck, P. Utzat, P. A. Hart, A. Malik, J. W. Gary, J. Lauber, Shlomo Dado, C. Darling, Peter Sherwood, Terry Richard Wyatt, M. G. Rison, Stefan Kluth, Shlomit Tarem, S. W. O'Neale, J. Steuerer, Eilam Gross, D. S. Koetke, M. F. Turner-Watson, R. Lahmann, Ch. Geich-Gimbel, M. Fanti, D. Axen, M. J. Pearce, M. Tscheulin, John Hill, M. Morii, D. C. Imrie, Georges Azuelos, Marcello Mannelli, J. E. Duboscq, P. W. Jeffreys, Alexander Wagner, R. Bartoldus, J. R. Carter, E. L. Barberio, G. N. Patrick, Andris Skuja, T. J. McMahon, S. De Jong, A. S. Turcot, C. Dallapiccola, Helfried Burckhart, J. Schwiening, Peter R Hobson, R. K. Carnegie, B. Stockhausen, Paul Kyberd, Otmar Biebel, P. Mättig, Shoji Asai, D. L. Wagner, K. W. Bell, K. Runge, P. Bock, Giora Mikenberg, G. P. Siroli, A. I. McNab, J. D. Gillies, A. Buijs, P. Routenburg, Daniel Lellouch, F. G. Oakham, Gregor Herten, J. Goldberg, Misao Sasaki, J. King, G. D. Long, P. Poffenberger, D. M. Strom, C. Stegmann, B. Nellen, Tetsuro Mashimo, M. J. Losty, H. Deng, Takehiko Mori, N. Altekamp, Tatsuo Kawamoto, H. Fukui, B. C. Shen, S. Braibant, R. J. Barlow, D. J. Miller, B. Wilkens, Harold Ogren, Matthias Schröder, P. Bright-Thomas, R. D. Heuer, Siegfried Bethke, H. Przysiezniak, Marco Cuffiani, Douglas Gingrich, V. Zacek, Fabrizio Fabbri, P. Gagnon, A. K. Honma, B. Nijjhar, J. Letts, F. X. Gentit, J. E. Conboy, R. Van Kooten, A. Fürtjes, J. J. Ward, O. C. Cooke, P. Vikas, M. J. Goodrick, I. Cohen, P. Schütz, Sherry Towers, I. J. Bloodworth, W. Gorn, P. S. Wells, D. Lanske, G. A. Snow, S. B. Anderson, Norbert Wermes, S. Söldner-Rembold, P. Szymanski, N. J. Oldershaw, W. Mohr, R. Giacomelli, Gunter Wolf, S. Orito, M. Settles, Yoram Rozen, C. Y. Chang, M. Foucher, J. G. Layter, Dave Charlton, M. Rosvick, A. A. Carter, R.J. Akers, F. Wäckerle, G. T. Zorn, J. von Krogh, Junichi Kanzaki, P. Taras, Stan Bentvelsen, D. Karlen, R. Bürgin, B. Fabbro, C. Burgard, P. Berlich, R. J. Hawkings, O. Schaile, C. Charlesworth, Michael Kobel, U. Müller, Kelby Anderson, G. Giacomelli, H. M. Bosch, Wolfram Dietrich Zeuner, L. A. del Pozo, Gideon Bella, Julie Kirk, H. Lafoux, S. Wotton, M. Starks, Frank Merritt, A. J. Martin, S. G. Clowes, M. Fierro, J. E.G. Edwards, C. K. Hargrove, G. G. Hanson, John Allison, Xinchou Lou, P. Schenk, M. S. Dixit, Frans Meijers, T. Behnke, R. G. Kellogg, Stefano Marcellini, Peter Watkins, Fred Loebinger, Stephen Lloyd, M. Tecchio, Robert M Brown, R. Kowalewski, K. Ametewee, Gideon Alexander, Paolo Capiluppi, Ehud Duchovni, J. C. Clayton, M. Jimack, T. J. Smith, K. Stephens, W. Matthews, Mark Oreglia, M. A. Thomson, F. Palmonari, V. Gibson, S. W. Gensler, A. Gaidot, T. Wlodek, M. Sproston, D. R. Ward, T. Kress, Christopher P. Ward, Frank Fiedler, D. Hochman, Hal Evans, T. Tsukamoto, N. Tesch, N. K. Watson, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, A. Posthaus, Margret Fincke-Keeler, D. L. Rees, Paolo Giacomelli, M. Hansroul, F. Scharf, C. H. Shepherd-Themistocleous, R. J. Homer, A. D. Schaile, Madjid Boutemeur, P. G. Estabrooks, H. M. Fischer, A. Michelini, S. A. Robins, Silvia Arcelli, C. J. Oram, N. I. Geddes, E. A. Mckigney, W. P. Lai, N. L. Rodning, B. Poli, J. M. Roney, A. M. Rossi, W. R. Gibson, A. Beck, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, C. Hartmann, D. E. Plane, Stephen Hillier, G. M. Dallavalle, Alan Watson, and Reda Tafirout
Subjects: Baryon, Nuclear physics, Physics, Nuclear and High Energy Physics, Electron–positron annihilation, Hadron, Atomic physics
Abstract: The lifetime of the Λ b 0 baryon has been measured using 3.6 million hadronic Z 0 decays recorded by the OPAL detector at LEP from 1990 to 1994. A sample of Λ b 0 decays is obtained using partially reconstructed semileptonic decays involving Λ c + l − combinations, where the Λ c + is reconstructed from its decay to a pK − π + final state. From the 69 ± 13 Λ c + l − combinations attributed to Λ b 0 decays in this data sample, we measure τ ( Λ b 0 ) = 1.14 −0.19 +0.22 ± 0.07 ps, where the errors are statistical and systematic, respectively.
Published: 1995

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

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

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

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

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

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

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

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

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

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

19. A measurement of the production of D*± mesons on the Z0 resonance

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

20. A test ofCP-invariance in Z0??+?? using optimal observables

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

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

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

22. Updated measurement of the τ lifetime

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

23. Double-sided FoxFET biased microstrip detectors

Author: U. C. Dunwoody, A.D. Lucas, G. A. Beck, V. Gibson, C.D. Wilburn, A. A. Carter, N.M. Greenwood, Phillip Allport, T. W. Pritchard, M. Bullough, A. J. Martin, M. J. Goodrick, and J. R. Carter
Subjects: Physics, Nuclear and High Energy Physics, business.industry, Detector, Biasing, STRIPS, Noise (electronics), law.invention, law, Optoelectronics, Electrical measurements, Field-effect transistor, business, Instrumentation, Ohmic contact, Radiation hardening
Abstract: The use of the field effect transistor, integrated onto AC-coupled silicon detectors, as a novel technique for biasing the implanted p + strips [P.P. Allport et al., Nucl. Instr. and Meth. A 310 (1991) 155], was first employed for the OPAL microvertex detector. The detector has proved very successful, with ladders of three single-sided detectors showing signal/noise of 22:1 with MX5 readout electronics [P.P. Allport et al., Nucl. Instr. and Meth. A 324 (1993) 34; Nucl. Phys. B (Proc. Suppl.) 32 (1993) 208]. This technique has been extended to bias also the n + strips and p strips on the ohmic side of a double-sided detector [P.P. Allport et al., Nucl. Instr. and Meth. A, to be submitted]. Full-size detectors with orthogonal readout have been fabricated by Micron and tested with MX7 readout on both sides. Both the junction and ohmic sides of these detectors have similar signal/noise values to those for single-sided wafers [P.P. Allport et al., Nucl. Instr. and Meth. A, to be submitted]. Test structures have been irradiated with beta particles to study the radiation hardness of the devices, and probe station electrical measurements of the detectors and test structures are presented.
Published: 1994

24. Measurement of the time dependence of ↔ mixing using leptons and D∗± mesons

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

25. 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

26. The extended OPAL silicon strip microvertex detector

Author: M. Bobinski, Jacqueline Batley, S. B. Anderson, Paul Kyberd, T. W. Pritchard, M. Jiminez, G. G. Hanson, G. A. Beck, A. K. Honma, J. R. Carter, V. Gibson, A. J. Martin, Christopher Jones, T. Behnke, Eilam Gross, W. Glessing, K. Muhlemann, F. R. Jacob, R. Mir, U. C. Dunwoody, A. McNab, R. Hammarström, M. J. Goodrick, D. R. Rust, R. Van Kooten, J. Lauber, P. Jovanovic, T. Junk, M. Hapke, S.J. de Jong, and A. A. Carter
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Large Hadron Collider, Silicon, Physics::Instrumentation and Detectors, Detector, chemistry.chemical_element, Tracking (particle physics), Bottom quark, law.invention, Nuclear physics, chemistry, law, Higgs boson, Hermetic detector, High Energy Physics::Experiment, Detectors and Experimental Techniques, Collider, Instrumentation
Abstract: The OPAL experiment at the CERN LEP collider recently increased the geometrical acceptance of its silicon microvertex detector. The azimuthal coverage is improved by adding one pair of detector modules to each of the two layers, while the polar angle coverage is extended by adding new detector modules in line with the existing ones. This improves the efficiency for high quality tracking in OPAL and in particular for b quark tagging in Higgs boson searches. A description of the detector is given, with emphasis on new or modified elements with respect to the earlier version. Results on the performance of the new detector are presented.
Published: 1997

27. Test of the exponential decay law at short decay times using tau leptons

Author: Silvia Arcelli, P. S. Wells, W. R. Gibson, C. Sbarra, P. E.L. Clarke, M. K. Jones, J. P. Martin, M. Kobe, Sachio Komamiya, Terry Richard Wyatt, J. E. Bloomer, E. A. Mckigney, Stefan Kluth, Shlomit Tarem, Theodoros Geralis, E. Ros, T. P. Kokott, A. Luig, H. M. Fischer, A. Michelini, LP Duerdoth, S. A. Robins, B. T. Bouwens, G. Yekutieli, Frank Fiedler, D. Hochman, A. A. Carter, M. Tscheulin, S. De Jong, T. Behnke, J. Steuerer, A. H. Bal, Eilam Gross, W. P. Lai, C. J. Oram, S. M. Gascon-Shotkin, A. M. Rossi, Lorne Levinson, Ron Folman, Roger Jones, H. Przysiezniak, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, A. Joly, S. Yamashita, Paolo Giacomelli, P. Igo-Kemenes, M. Hansroul, P. D. Phillips, B. J. King, P. Utzat, A. N. Bell, T. W. Pritchard, R. J. Homer, Gilles Beaudoin, A. Skillman, M. G. Rison, T. J. McMahon, Richard Nisius, K. Ametewee, Margret Fincke-Keeler, D. Axen, A. Jawahery, Gideon Alexander, Peter Sherwood, J. Schwiening, Guenter Duckeck, R. K. Carnegie, J. G. Layter, E. Lefebvre, Alexander Wagner, Paolo Capiluppi, J. M. Roney, J. Ludwig, C. Hartmann, F. X. Gentit, D. E. Plane, F. Odorici, K. Runge, P. Bock, C. Charlesworth, I. J. Bloodworth, J. A. Wilson, J. Lauber, P. Poffenberger, H. Jeremie, R. E. Hughes-Jones, Yoram Rozen, A. S. Turcot, G. Wolf, G. M. Dallavalle, Marco Cuffiani, F. Strumia, R. Lahmann, M. Hapke, D. C. Imrie, M. Palazzo, Stefania Xella, M. Foucher, S. Wotton, M. Jimack, U. Müller, M. J. Oregliai, Gideon Bella, C. H. Shepherd-Themistocleous, H. J. Burckhart, A. J. Martin, D. Karlen, C. Burgard, Jacqueline Batley, Alan Watson, F. Palmonari, E. do Couto e Silva, G. P. Siroli, A. I. McNab, D. E. Hutchcroft, F. S. Merritt, J. Goldberg, P. Schütz, R. Van Kooten, G. Azuelos, Andris Skuja, S. W. Gensler, S. J. Hillier, B. Nellen, T. Omori, G. D. Long, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, H. Mes, Tetsuro Mashimo, P. Fath, Sven Menke, C. K. Hargrove, V. Zacek, G. G. Hanson, Tara Shears, N. I. Geddes, F. Wäckerle, D. M. Gingrich, A. Gaidot, W. Gorn, H. G. Evans, M. J. Goodrick, I. Cohen, J. A. McKenna, R. W. Springer, P. Gagnon, M. F. Turner-Watson, J. R. Carter, M. Morii, D. Chrisman, U. C. Dunwoody, P. A. Hart, P. Berlich, R. Bartoldus, Peter R Hobson, P. Schenk, P. Scharff-Hansen, H. O. Ogren, G. A. Beck, A. Sittler, Christoph Geich-Gimbel, S. B. Anderson, P. Szymanski, M. S. Dixit, P. Routenburg, Achim Stahl, S. Braibant, D. Rigby, R. J. Hemingway, Frans Meijers, E. Tsur, A. M. Smith, J. E. Conboy, S. L. Chu, Stephen Lloyd, M. J. Pearce, Gabriella Pasztor, K. W. Bell, G. Vasseur, Robert M Brown, B. Lorazo, R. D. Heuer, B. W. Kennedy, P. Jovanovic, Fabrizio Fabbri, Madjid Boutemeur, O. C. Cooke, P. G. Estabrooks, H. M. Bosch, G. W. Wilson, Stan Bentvelsen, A. Fürtjes, D. L. Rees, B. Schmitt, Peter Krieger, M. Hauschild, Dave Charlton, F. Scharf, German Martinez, P. M. Watkins, Manuella Vincter, J. von Krogh, G. A. Snow, C. P. Ward, R. Bürgin, B. Fabbro, A. D. Schaile, Alessandro Montanari, W. Matthews, S. Söldner-Rembold, R. J. Hawkings, C. Markus, G. Giacomelli, M. A. Thomson, C. Dallapiccola, L. A. del Pozo, T. Wlodek, M. Sproston, D. M. Strom, C. Stegmann, J. Palinkas, Shlomo Dado, T. Tsukamoto, N. Tesch, H. Fukui, E. H. Vokurka, N. Altekamp, Giora Mikenberg, R. Rylko, R. J. Barlow, N. K. Watson, D. J. Miller, C. Darling, T. J. Smith, N. J. Oldershaw, Reda Tafirout, A. K. Honma, P. Mättig, Shoji Asai, S. W. O'Neale, W. Mohr, K. J. Anderson, T. Kobayashi, U. Jost, R. Mir, A. Posthaus, Richard Keeler, K. Stephens, O. Schaile, D. R. Rust, P. Weber, E. Duchovni, Otmar Biebel, R. Howard, D. L. Wagner, A. M. Lee, Matthias Schröder, M. Tecchio, E. von Törne, A. E. Barberio, V. Gibson, M. Starks, J. Letts, H. Takeda, Norbert Wermes, Sherry Towers, T. Kawamoto, S. Orito, M. Rosvick, F. G. Oakham, D. R. Ward, H. Lafoux, T. Kress, James Pinfold, T. Hilse, O. Runolfsson, D. G. Fong, C. Lewis, C. Beeston, Gregor Herten, Claudio Grandi, J. Gascon, B. Wilkens, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. P. Pansart, Michael Hildreth, J. E. Pilcher, N. L. Rodning, B. Poli, Ekg Sarkisyan, P. W. Jeffreys, John Allison, G. N. Patrick, R. G. Kellogg, Csaba Hajdu, Stefano Marcellini, P. Bright-Thomas, J. J. Ward, P. Vikas, J. C. Hill, Misao Sasaki, W. J. McDonald, D. Lanske, B. C. Shen, J. Bechtluit, Siegfried Bethke, B. Nijjhar, W. G. Scott, J. D. King, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Kowalewski, Joleen Pater, Dezso Horvath, M. J. Losty, R. Giacomelli, Jean-Arcady Meyer, S. G. Clowes, M. Fierro, J. E.G. Edwards, C. Y. Chang, P. Taras, and Julie Kirk
Subjects: Physics, Nuclear and High Energy Physics, Disk formatting, Particle physics, Természettudományok, High Energy Physics::Experiment, Statistical analysis, Fizikai tudományok, Exponential decay, Particle Physics - Experiment, Test (assessment), Lepton
Abstract: This is the post-print version of the final paper published in Physics Letters B. The published article is available from the link below. Changes resulting from the publishing process, such as peer review, editing, corrections, structural formatting, and other quality control mechanisms may not be reflected in this document. Changes may have been made to this work since it was submitted for publication. Copyright @ 1996 Elsevier B.V Quantum mechanics predicts an exponential distribution for the decay time of massive particles. However, deviations are expected for decay times shorter than about 10−13 s in models conjecturing the existence of hidden variables. Following a recent proposal, the decay length distribution of 5843 τ leptons decaying into 3 charged particles was analyzed in search of such a deviation. The deviation from an exponential distribution with respect to the number of decays present within the exponential form, expressed as the relative weight of an excess at zero decay length, was measured to be 1.1%±1.4%±3.5%. This result is consistent with zero deviation and leads to an upper limit of 8.5% and a lower limit of −6.3% at the 95% confidence level.
Published: 1996

28. Investigation of the string effect using final state photons

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

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

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

30. A search for lepton flavour violating $Z^{0}$ decays

Author: R. Lahmann, D. C. Imrie, Matthias Schröder, G. P. Siroli, J. King, C. M. Hawkes, Daniel Lellouch, D. R. Rust, Takehiko Mori, B. C. Shen, Ehud Duchovni, Siegfried Bethke, A. K. Honma, B. Nijjhar, W. G. Scott, N. J. Oldershaw, R.J. Akers, V. Zacek, A. M. Lee, M. Jimack, E. von Törne, F. Palmonari, M. Hapke, S. W. Gensler, S. J. Hillier, T. Kobayashi, H. Mes, D. E. Hutchcroft, O. Schaile, Kiyotomo Kawagoe, I. P. Duerdoth, P. Fath, A. M. Rossi, P. Weber, M. J. Losty, M. J. Oreglia, M. Starks, A. J. Martin, R. Van Kooten, F. S. Merritt, U. Müller, Andris Skuja, G. D. Long, J. Bechtluft, J. A. McKenna, H. M. Fischer, I. J. Bloodworth, G. W. Wilson, F. Wäckerle, C. Dallapiccola, M. Hauschild, P. Igo-Kemenes, D. M. Gingrich, A. Michelini, Tetsuro Mashimo, M. Settles, Paolo Giacomelli, O. C. Cooke, Stephen Lloyd, R. W. Springer, C. Markus, M. Hansroul, J. D. Gillies, Yoram Rozen, M. Tecchio, S. Braibant, H. Jeremie, P. Berlich, Gideon Bella, C. K. Hargrove, M. Foucher, M. Fanti, J. R. Carter, R. E. Hughes-Jones, H. J. Burckhart, D. L. Rees, Jacqueline Batley, M. F. Turner-Watson, J. Steuerer, Georges Azuelos, G. N. Patrick, K. W. Bell, S. A. Robins, F. Scharf, W. Gorn, Junichi Kanzaki, D. Karlen, C. H. Shepherd-Themistocleous, Madjid Boutemeur, A. D. Schaile, R. D. Heuer, Fabrizio Fabbri, N. Altekamp, R. J. Barlow, D. J. Miller, E. Lefebvre, C. Burgard, T. J. Smith, K. Stephens, Tara Shears, Reda Tafirout, P. W. Jeffreys, P. G. Estabrooks, Gregor Herten, M. Morii, A. Buijs, D. M. Strom, C. Stegmann, R. K. Keeler, J. C. Hill, Misao Sasaki, Otmar Biebel, D. L. Wagner, E. do Couto e Silva, R. J. Homer, G. A. Snow, C. P. Ward, R. Mir, Peter R Hobson, H. Fukui, G. G. Hanson, N. K. Watson, F. Odorici, P. Routenburg, R. Kowalewski, S. W. O'Neale, S. Söldner-Rembold, B. Wilkens, U. C. Dunwoody, P. A. Hart, K. J. Anderson, P. Scharff-Hansen, J. P. Pansart, K. Ametewee, J. Lauber, Xinchou Lou, P. M. Watkins, D. Axen, P. Bright-Thomas, H. Deng, Sven Menke, A. Jawahery, N. I. Geddes, Gideon Alexander, Paolo Capiluppi, W. Mohr, A. Posthaus, W. R. Gibson, J. E. Pilcher, C. Darling, N. L. Rodning, B. Poli, J. J. Ward, J. von Krogh, M. J. Pearce, Dave Charlton, P. Poffenberger, G. Giacomelli, W. Matthews, A. M. Smith, G. A. Beck, M. A. Thomson, P. Vikas, P. Mättig, F. G. Oakham, J. Letts, G. Vasseur, B. Lorazo, Silvia Arcelli, Shlomo Dado, Achim Stahl, Shoji Asai, D. Lanske, E. L. Barberio, P. Teixeira-Dias, R. Bürgin, E. K. U. Gross, A. Beck, P. Schütz, T. Wlodek, B. Fabbro, Norbert Wermes, P. S. Wells, Sherry Towers, T. Kawamoto, James Pinfold, M. Sproston, P. Schenk, R. J. Hawkings, Peter Sherwood, A. Gaidot, D. G. Fong, T. Tsukamoto, N. Tesch, V. Gibson, Terry Richard Wyatt, Marco Cuffiani, J. Gascon, E. A. Mckigney, R. M. Brown, Lorne Levinson, Alexander Wagner, M. S. Dixit, S. Orito, Frans Meijers, P. D. Phillips, W. P. Lai, L. A. del Pozo, M. Rosvick, C. Y. Chang, A. Malik, B. Schmitt, J. Ludwig, S. L. Chu, Sachio Komamiya, J. W. Gary, D. Rigby, R. J. Hemingway, D. S. Koetke, C. Sbarra, Gilles Beaudoin, Giora Mikenberg, K. Runge, P. Bock, P. Taras, Michael Kobel, Theodoros Geralis, E. Ros, A. T. Watson, J. M. Roney, Marcello Mannelli, J. E. Duboscq, A. Skillman, J. G. Layter, S. G. Clowes, B. W. Kennedy, M. Fierro, J. E.G. Edwards, P. Jovanovic, Julie Kirk, H. Lafoux, C. Hartmann, D. E. Plane, C. Charlesworth, Austin Ball, P. Gagnon, G. Yekutieli, T. Hilse, Peter Krieger, G. M. Dallavalle, O. Runolfsson, R. Howard, T. P. Kokott, D. R. Ward, P. E.L. Clarke, Manuella Vincter, Alessandro Montanari, M. K. Jones, A. Luig, Margret Fincke-Keeler, C. Beeston, J. P. Martin, Claudio Grandi, T. Kress, G. T. Zorn, M. Tscheulin, S. De Jong, H. M. Bosch, Wolfram Dietrich Zeuner, A. A. Carter, Ron Folman, Roger Jones, H. Przysiezniak, J. C. Clayton, T. Behnke, B. J. King, P. Utzat, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, Frank Fiedler, D. Hochman, Stefan Kluth, Shlomit Tarem, C. J. Oram, A. I. McNab, J. Goldberg, B. Nellen, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, J. E. Conboy, A. Fürtjes, H. G. Evans, M. J. Goodrick, I. Cohen, Gunter Wolf, F. X. Gentit, S. Wotton, S. B. Anderson, P. Szymanski, Stan Bentvelsen, John Allison, A. S. Turcot, R. G. Kellogg, Stefano Marcellini, A. Joly, M. W. Redmond, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, T. W. Pritchard, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Guenter Duckeck, and R. Giacomelli
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Elementary particle, Engineering (miscellaneous), Particle Physics - Experiment, Lepton
Abstract: We have searched for lepton flavour violating Z0→eμ, Z0→eτ and Z0→μτ decays in a sample of 4.0×106 visible Z0 decays collected with the OPAL detector at LEP during 1991 to 1994. No candidates are found for Z0→eμ. The samples of selected Z0→eτ and Z0→μτ candidates are consistent with the expected background. The following limits are set at 95% confidence level: $$\begin{gathered} BR(Z^0 \to e\mu ){\text{ }}< {\text{ 1}}{\text{.7 }} \times {\text{ 10}}^{ - {\text{6}}} \hfill \\ BR(Z^0 \to e\tau ){\text{ }}< {\text{ 9}}{\text{.8 }} \times {\text{ 10}}^{ - {\text{6}}} \hfill \\ BR(Z^0 \to \mu \tau ){\text{ }}< {\text{ 17}}{\text{. }} \times {\text{ 10}}^{ - {\text{6}}} . \hfill \\ \end{gathered}$$
Published: 1995

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

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

32. Search for heavy charged particles and for particles with anomalous charge in $e^{+}e^{-}$ collisions at LEP

Author: C. Y. Chang, P. Taras, Michael Kobel, Julie Kirk, H. Lafoux, P. Poffenberger, Peter Fischer, P. Schütz, O. Tousignant, S. W. O'Neale, K. J. Anderson, Otmar Biebel, S. Braibant, D. L. Wagner, Dave Charlton, H. Deng, R. Bartoldus, P. Igo-Kemenes, R. Bürgin, B. Fabbro, J. Letts, H. Jeremie, H. O. Ogren, R. E. Hughes-Jones, H. Mes, I. P. Duerdoth, G. A. Snow, C. P. Ward, G. Giacomelli, Norbert Wermes, U. Maur, R. Van Kooten, Gideon Bella, P. Fath, Matthias Schröder, R. W. Springer, Christoph Geich-Gimbel, V. Gibson, H. J. Burckhart, Jacqueline Batley, D. L. Rees, S. Söldner-Rembold, R. Mir, Sherry Towers, T. Kawamoto, E. do Couto e Silva, J. Lauber, S. Orito, S. L. Chu, N. J. Oldershaw, C.J. Beeston, H. Takeda, Tohru Takeshita, F. X. Gentit, R.J. Akers, Xinchou Lou, M. Rosvick, Shlomo Dado, J. E. Conboy, A. Fürtjes, Georges Azuelos, Barry King, F. G. Oakham, W. Matthews, D. M. Gingrich, E. L. Barberio, P. Scharff-Hansen, M. Yurko, D. E. Plane, M. A. Thomson, C. Sbarra, E. Lefebvre, P. W. Jeffreys, K. W. Bell, E. K. U. Gross, P. Berlich, Ehud Duchovni, F. Odorici, M. F. Turner-Watson, M. Morii, G. M. Dallavalle, A. Gaidot, T. Wlodek, M. Sproston, J. C. Hill, D. Rigby, R. J. Hemingway, Michael Dittmar, Peter R Hobson, O. Schaile, Misao Sasaki, B. W. Kennedy, F. S. Merritt, M. J. Oreglia, B. C. Shen, Giora Mikenberg, M. Jimack, G. Yekutieli, D. Axen, P. Routenburg, J. Steuerer, Silvia Arcelli, Kiyotomo Kawagoe, P. Jovanovic, D. R. Rust, U. Müller, F. Palmonari, P. Bright-Thomas, Alan Watson, T. Tsukamoto, N. Tesch, Austin Ball, Peter Krieger, Siegfried Bethke, A. K. Honma, S. W. Gensler, M. Starks, Peter Sherwood, A. M. Smith, W. G. Scott, A. I. McNab, A. A. Carter, J. Goldberg, N. K. Watson, Ron Folman, Roger Jones, S. J. Hillier, A. J. Martin, Alexander Wagner, J. Hagemann, J. Ludwig, B. Nellen, Richard Keeler, J. J. Ward, G. Vasseur, Manuella Vincter, W. R. Gibson, A. Jawahery, Alessandro Montanari, J. A. McKenna, K. Runge, P. Bock, P. Leblanc, G. N. Patrick, P. Vikas, P. Weber, A. M. Lee, B. Lorazo, P. Utzat, G. W. Wilson, M. Hauschild, A. Yeaman, Juergen Thomas, C. Dallapiccola, M. G. Rison, Marco Cuffiani, H. G. Evans, M. J. Goodrick, W. P. Lai, A. Beck, J. D. Gillies, E. Heflin, R. Kowalewski, W. Mohr, O. C. Cooke, C. Markus, I. Cohen, Sachio Komamiya, Theodoros Geralis, E. Ros, A. Posthaus, J. M. Roney, C. K. Hargrove, Lorne Levinson, P. D. Phillips, R. Lahmann, R. Howard, Claude Leroy, G. D. Lafferty, P. A. Elcombe, Tara Shears, M. Fanti, T. P. Kokott, A. Luig, Erez Etzion, Margret Fincke-Keeler, D. C. Imrie, T. Behnke, T. Hilse, Gilles Beaudoin, D. J. Miller, C. M. Hawkes, A. Skillman, James Pinfold, Madjid Boutemeur, N. Capdevielle, K. Ametewee, David Robinson, Stefan Kluth, Shlomit Tarem, J. von Krogh, J. P. Pansart, Daniel Lellouch, P. G. Estabrooks, P. A. Hart, Gideon Alexander, C. J. Oram, O. Runolfsson, G. P. Siroli, J. King, Christoph Schwick, Paolo Capiluppi, B. Nijjhar, Takehiko Mori, M. J. Pearce, Gregor Herten, P. Gagnon, M. J. Losty, D. G. Fong, B. Wilkens, R. P. Middleton, L. A. del Pozo, T. J. McMahon, V. Zacek, P. M. Watkins, Reda Tafirout, A. Buijs, D. M. Strom, C. Stegmann, Gunter Wolf, F. Scharf, Claudio Grandi, J. Allison, J. E. Pilcher, A. D. Schaile, J. Schwiening, G. T. Zorn, T. Kobayashi, J. Gascon, G. A. Beck, R. K. Carnegie, J. A. Wilson, S. Wotton, H. M. Bosch, Achim Stahl, Stephen Lloyd, P. Teixeira-Dias, M. Tecchio, Robert M Brown, R. D. Heuer, Fabrizio Fabbri, Wolfram Dietrich Zeuner, H. Fukui, T. R. Wyatt, B. Schmitt, R. J. Barlow, S. G. Clowes, M. Fierro, J. E.G. Edwards, C. Darling, T. J. Smith, Paolo Giacomelli, M. Hansroul, P. Mättig, Shoji Asai, P. E.L. Clarke, C. H. Shepherd-Themistocleous, I. J. Bloodworth, R. J. Homer, P. S. Wells, M. Settles, Yoram Rozen, M. Foucher, U. C. Dunwoody, M. K. Jones, Junichi Kanzaki, D. Karlen, C. Burgard, J. P. Martin, J. W. Gary, D. S. Koetke, M. Tscheulin, S. De Jong, Marcello Mannelli, J. E. Duboscq, Andris Skuja, G. D. Long, H. Przysiezniak, Tetsuro Mashimo, G. G. Hanson, W. Gorn, P. Schenk, M. S. Dixit, Frans Meijers, J. G. Layter, C. Charlesworth, H. M. Fischer, A. Michelini, S. A. Robins, J. R. Carter, N. I. Geddes, N. L. Rodning, B. Poli, A. M. Rossi, R. G. Kellogg, Stefano Marcellini, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Giacomelli, M. W. Redmond, A. S. Turcot, J. C. Clayton, V. H. Winterer, P. Szymanski, C. Jui, Stan Bentvelsen, K. Stephens, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, T. W. Pritchard, Guenter Duckeck, D. R. Ward, T. Kress, and D. Hochman
Subjects: Physics, Gluino, Particle physics, Luminosity (scattering theory), Physics and Astronomy (miscellaneous), Electron–positron annihilation, Monte Carlo method, Charge (physics), Charged particle, Nuclear physics, Momentum, High Energy Physics::Experiment, Ionization energy, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Using the OPAL data accumulated in 1991–1993 amounting to 74 pb−1 of integrated luminosity, corresponding to 1.64×106 selected multi-hadronic events, a search has been performed for charged particles with unusual mass or unusual charge. The mass was determined from a combination of momentum and ionization energy loss measurements. No isolation criteria were applied to the tracks examined, so that both isolated particles and particles produced in jets were valid candidates. For particles with chargeQ/e=−1, one candidate with a mass of approximately 4.2 GeV/c2 was found, which is compatible with the background rate expected according to a Monte Carlo simulation. The implications of this search for the mass limits of a conjectured stable or quasi-stable charged gluino composite $$(\tilde gq\bar q')^ \pm $$ are discussed. Limits are also presented for the production of fractionally-charged particles withQ/e=±2/3 and ±4/3 as well as for particles withQ/e=±2.
Published: 1995

33. Measurement of the $\tau$ Lepton Polarization and its Forward-Backward Asymmetry from $Z^{0}$ Decays

Author: J. Steuerer, B. Stockhausen, Paul Kyberd, Eilam Gross, Paolo Giacomelli, F. K. Loebinger, K. Stephens, P. Igo-Kemenes, M. Hansroul, J. R. McNutt, J. G. Layter, P. Le Du, B. Fabbro, C. Y. Chang, Sachio Komamiya, M. Yurko, P. W. Jeffreys, C. Charlesworth, F. S. Merritt, R. Giacomelli, H. Jeremie, R. Bartoldus, H. O. Ogren, Christoph Geich-Gimbel, C. H. Shepherd-Themistocleous, F. X. Gentit, J. E. Conboy, A. Fürtjes, G. Giacomelli, Theodoros Geralis, E. Ros, R. J. Homer, Michael Kobel, R. E. Hughes-Jones, U. Maur, Madjid Boutemeur, M. J. Oreglia, J. A. McKenna, T. P. Kokott, D. Axen, M. Fanti, Gideon Bella, H. J. Burckhart, C. M. Hawkes, Daniel Lellouch, P. Bright-Thomas, A. Luig, A. Höcker, V. Gibson, R. Mir, P. G. Estabrooks, D. R. Ward, A. Jawahery, H. Lafoux, P. E.L. Clarke, Jacqueline Batley, P. S. Wells, Margret Fincke-Keeler, J. Lauber, Tohru Takeshita, J. J. Ward, E. do Couto e Silva, J. Mildenberger, Takehiko Mori, U. C. Dunwoody, M. K. Jones, P. M. Watkins, Andris Skuja, G. N. Patrick, Shlomo Dado, J. P. Martin, Otmar Biebel, Peter Sherwood, R. W. Springer, Alexander Wagner, Gregor Herten, M. Coupland, Georges Azuelos, Barry King, H. Takeda, Xinchou Lou, D. G. Charlton, D. L. Wagner, S. Wotton, D. Hochman, Marco Cuffiani, S. De Jong, M. W. Redmond, F. G. Oakham, P. Pfister, H. Deng, R. Humbert, J. Hagemann, J. Ludwig, K. Runge, P. Bock, B. Wilkens, E. L. Barberio, S. W. O'Neale, K. W. Bell, G. D. Long, Tetsuro Mashimo, T. R. Wyatt, P. Szymanski, A. I. McNab, J. Goldberg, A. Buijs, R. D. Heuer, K. J. Anderson, D. Rigby, R. J. Hemingway, P. Gagnon, Fabrizio Fabbri, J. C. Hill, D. M. Strom, C. Stegmann, Misao Sasaki, M. H. Fischer, R. J. Barlow, B. C. Shen, D. Van den plas, H. Przysiezniak, S. G. Clowes, B. Nellen, M. Fierro, Silvia Arcelli, R. G. Kellogg, P. Leblanc, D. S. Koetke, J. E. Pilcher, H. Fukui, Norbert Wermes, Sherry Towers, T. Kawamoto, C. Moisan, G. A. Beck, G. G. Hanson, Achim Stahl, J. Allison, R. Ströhmer, Stefano Marcellini, P. Teixeira-Dias, G. T. Zorn, B. W. Kennedy, Siegfried Bethke, A. K. Honma, W. G. Scott, Kiyotomo Kawagoe, D. R. Rust, P. Jovanovic, James Letts, Ehud Duchovni, F. Liu, A. Yeaman, T. Hilse, Austin Ball, P. Schenk, C. Jui, S. Braibant, S. Orito, H. G. Evans, M. S. Dixit, M. Jimack, H. Ihssen, H. M. Bosch, Peter Krieger, B. Schmitt, Wolfram Dietrich Zeuner, S. L. Chu, P. Poffenberger, P. D. Grannis, O. Runolfsson, M. J. Losty, M. Rosvick, Frans Meijers, M. J. Goodrick, I. Cohen, Manuella Vincter, Alessandro Montanari, R.J. Akers, A. M. Lee, N. I. Geddes, J. C. Clayton, J. Hart, C. Dallapiccola, I. J. Bloodworth, Stan Bentvelsen, W. Gorn, S. W. Gensler, Claudio Grandi, Erez Etzion, G. Mikenberg, S. J. Hillier, T. Kobayashi, J. D. Gillies, David Robinson, J. M. Roney, Stefan Kluth, Richard Keeler, D. A. Hinshaw, G. A. Snow, C. P. Ward, Z. Li, Shlomit Tarem, G. D. Lafferty, O. Schaile, R. Van Kooten, D. Pitman, S. Rossberg, C. J. Oram, D. L. Rees, T. Behnke, M. H. Lehto, R. Howard, M. F. Turner-Watson, P. Weber, D. J. Miller, M. Morii, Peter R Hobson, R. P. Middleton, Claude Leroy, J. P. Pansart, C.J. Beeston, A. J. Martin, P. Routenburg, M. Settles, Hans-Christian Schultz-Coulon, James Pinfold, D. M. Gingrich, M. Hauschild, Gy. Wolf, C. Markus, P. Berlich, Yoram Rozen, B. Poli, Stephen Lloyd, D. G. Fong, J. Gascon, M. Tecchio, Robert M Brown, H. von der Schmitt, Randall Sobie, Michael Schulz, M. Foucher, R. Kowalewski, J. W. Gary, T. W. Pritchard, Gideon Alexander, Paolo Capiluppi, G. W. Wilson, E. Lefebvre, Marcello Mannelli, J. E. Duboscq, F. Odorici, D. Karlen, C. Burgard, Guenter Duckeck, P. Scharff-Hansen, D. E. Plane, P. Bentkowski, G. M. Dallavalle, A. M. Smith, G. Vasseur, Alan Watson, B. Lorazo, H. Mes, I. P. Duerdoth, C. Darling, R. Lahmann, T. J. Smith, D. C. Imrie, A. M. Rossi, G. P. Siroli, J. King, Christoph Schwick, V. H. Winterer, P. Mättig, Shoji Asai, W. R. Gibson, A. Michelini, A. Beck, E. Heflin, S. A. Robins, N. K. Watson, Lorne Levinson, P. D. Phillips, J. R. Carter, Gilles Beaudoin, Peter Fischer, P. Schütz, Matthias Schröder, W. Mohr, A. Astbury, A. Posthaus, U. Müller, P. A. Elcombe, T. J. McMahon, C. K. Hargrove, J. Schwiening, Tara Shears, R. K. Carnegie, P. A. Hart, J. A. Wilson, B. Nijjhar, M. J. Pearce, J. Becker, F. Scharf, A. D. Schaile, C. Sbarra, A. Skillman, M. A. Thomson, A. Gaidot, T. Wlodek, M. Sproston, T. Tsukamoto, N. Tesch, Michael Dittmar, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, M. G. Rison, and J. von Krogh
Subjects: Quark, Physics, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, Electron–positron annihilation, Forward backward, Weinberg angle, Polarization (waves), Asymmetry, Nuclear physics, Engineering (miscellaneous), Particle Physics - Experiment, Lepton, media_common, Bhabha scattering
Abstract: We report on a measurement of the tau lepton polarization and its forward-backward asymmetry at the Z0 resonance using the OPAL detector. This measurement is based on analyses of the $$\tau \to e\bar v_e v_\tau $$ , $$\tau \to \mu \bar v_\mu v_\tau $$ , τ→π(K)v τ and τ→ρ v τ from a sample of 30663 e+e+→τ+τ- events collected during the years 1990 to 1992. Assuming that the tau lepton decays according to V-A theory, we measure the average τ polarization to be =(−14.9±1.9±1.3)% and the τ polarization forward-backward asymmetry to be A =(−8.9±2.2±0.9)%, where the first error is statistical and the second systematic. These results are consistent with the hypothesis of lepton universality. When combined under the assumption of universality, our results can be interpreted as a measurement of sin2 θ eff lept =0.2321±0.0023 within the context of the Standard Model.
Published: 1994

34. Determination of an upper limit for the mass of the $\tau$-neutrino at LEP

Author: James Pinfold, R. Bartoldus, D. G. Fong, J. Gascon, H. von der Schmitt, Tohru Takeshita, J. Hart, H. O. Ogren, Christoph Geich-Gimbel, C. Dallapiccola, Barry King, J. D. Gillies, Erez Etzion, S. L. Chu, J. W. Gary, A. Skillman, K. W. Bell, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, Stefan Kluth, D. Rigby, R. J. Hemingway, J. C. Hill, J. P. Martin, Marcello Mannelli, J. E. Duboscq, Misao Sasaki, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, D. J. Miller, Manuella Vincter, Alessandro Montanari, Shlomit Tarem, A. Gaidot, M. Fanti, V. H. Winterer, F. X. Gentit, Matthias Schröder, J. E. Conboy, A. Fürtjes, P. Igo-Kemenes, C. M. Hawkes, Daniel Lellouch, S. De Jong, T. Wlodek, M. Sproston, Takehiko Mori, S. Rossberg, C. J. Oram, R. P. Middleton, B. C. Shen, R. Mir, Siegfried Bethke, A. K. Honma, H. Jeremie, R. E. Hughes-Jones, Otmar Biebel, S. W. O'Neale, P. Le Du, B. Fabbro, A. I. McNab, J. Goldberg, W. G. Scott, E. Lefebvre, J. von Krogh, H. Takeda, D. G. Charlton, D. L. Wagner, B. Stockhausen, Paul Kyberd, T. Tsukamoto, N. Tesch, F. G. Oakham, K. J. Anderson, B. Nellen, P. Leblanc, P. Szymanski, F. K. Loebinger, E. L. Barberio, U. Maur, Paolo Giacomelli, R. Lahmann, Ehud Duchovni, D. C. Imrie, R.J. Akers, G. Giacomelli, A. Astbury, D. A. Hinshaw, N. I. Geddes, F. Odorici, H. G. Evans, Dave Robinson, M. Hansroul, R. D. Heuer, H. Deng, M. J. Losty, R. Humbert, M. J. Goodrick, Madjid Boutemeur, C. Y. Chang, U. Müller, I. Cohen, T. J. McMahon, P. Scharff-Hansen, A. Höcker, E. do Couto e Silva, Fabrizio Fabbri, C. Jui, J. C. Clayton, D. Van den plas, Z. Li, M. Jimack, P. A. Elcombe, R. Giacomelli, Shlomo Dado, Gideon Bella, W. R. Gibson, G. P. Siroli, J. King, I. J. Bloodworth, Michael Kobel, Gunter Wolf, O. Schaile, H. Ihssen, J. Schwiening, Stan Bentvelsen, H. J. Burckhart, R. K. Carnegie, F. S. Merritt, B. Poli, J. Steuerer, Eilam Gross, A. M. Smith, M. F. Turner-Watson, Jacqueline Batley, M. Morii, M. Settles, C. K. Hargrove, G. Azuelos, P. G. Estabrooks, Norbert Wermes, C. H. Shepherd-Themistocleous, R. J. Homer, Sherry Towers, T. Kawamoto, J. G. Layter, G. Vasseur, S. W. Gensler, H. Lafoux, Margret Fincke-Keeler, B. Lorazo, Christoph Schwick, T. Behnke, Andris Skuja, D. R. Rust, Yoram Rozen, A. J. Martin, J. Becker, S. Wotton, J. A. Wilson, H. M. Fischer, A. Beck, Giora Mikenberg, A. M. Lee, M. Foucher, E. Heflin, P. A. Hart, Peter R Hobson, S. J. Hillier, A. Michelini, C. Charlesworth, B. Nijjhar, P. Routenburg, S. Orito, M. Rosvick, G. D. Long, Tetsuro Mashimo, F. Scharf, T. Kobayashi, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, S. Braibant, R. G. Kellogg, A. D. Schaile, R. K. Keeler, C. Sbarra, M. J. Pearce, Xinchou Lou, D. Axen, A. Jawahery, G. W. Wilson, D. S. Koetke, H. Mes, Lorne Levinson, J. A. McKenna, P. D. Phillips, Michael Dittmar, Stefano Marcellini, T. Hilse, Marco Cuffiani, O. Runolfsson, Kiyotomo Kawagoe, T. W. Pritchard, S. A. Robins, N. K. Watson, James Letts, Sachio Komamiya, Theodoros Geralis, E. Ros, A. T. Watson, P. Poffenberger, D. Karlen, C. Burgard, Peter Fischer, I. P. Duerdoth, P. Pfister, Gilles Beaudoin, J. Mildenberger, G. Yekutieli, Peter Sherwood, M. Hauschild, R. Van Kooten, D. Pitman, W. Gorn, R. W. Springer, Alexander Wagner, G. A. Snow, C. P. Ward, Guenter Duckeck, M. H. Lehto, P. M. Watkins, P. Schütz, M. W. Redmond, M. J. Oreglia, G. G. Hanson, J. Hagemann, J. Ludwig, C.J. Beeston, K. Runge, P. Bock, D. L. Rees, P. Weber, Claudio Grandi, T. G. Shears, A. A. Carter, T. P. Kokott, A. Luig, C. Darling, Ron Folman, Roger Jones, R. Howard, W. Mohr, D. Hochman, Claude Leroy, F. Liu, C. Markus, M. Yurko, T. J. Smith, P. W. Jeffreys, D. M. Gingrich, P. Mättig, Shoji Asai, K. Stephens, C. Moisan, G. A. Beck, J. R. McNutt, J. R. Carter, Stephen Lloyd, M. Tecchio, P. Schenk, I. Lauber, P. Gagnon, Achim Stahl, G. N. Patrick, Robert M Brown, A. Posthaus, J. P. Pansart, J. Allison, P. Teixeira-Dias, M. G. Rison, A. M. Rossi, M. S. Dixit, R. Ströhmer, V. Gibson, Frans Meijers, P. Berlich, D. E. Plane, P. Bentkowski, Silvia Arcelli, G. M. Dallavalle, G. T. Zorn, P. Bright-Thomas, B. Schmitt, H. M. Bosch, J. J. Ward, Wolfram Dietrich Zeuner, M. A. Thomson, D. R. Ward, Gregor Herten, P. S. Wells, T. R. Wyatt, R. J. Barlow, H. Przysiezniak, S. G. Clowes, B. Wilkens, M. Fierro, M. Coupland, A. Yeaman, J. E. Pilcher, J. M. Roney, A. Buijs, D. M. Strom, C. Stegmann, P. D. Grannis, G. D. Lafferty, H. Fukui, R. Kowalewski, Gideon Alexander, and Paolo Capiluppi
Subjects: Physics, Nuclear physics, Particle physics, Physics and Astronomy (miscellaneous), Detector, High Energy Physics::Experiment, Invariant mass, Neutrino, Multiplicity (chemistry), Engineering (miscellaneous), Confidence interval, Particle Physics - Experiment
Abstract: An upper limit for theν τ mass is determined through the kinematic reconstruction of the decayτ→5π ± ν τ in the OPAL detector at LEP. The limit is obtained using a new method based on the comparison of the two-dimensional distribution of energy and invariant mass of the five-pion system with expectations from different neutrino mass hypotheses. From a sample of five events surviving the selection criteria we obtain an upper limit of 74 MeV at 95% confidence level. It is the first measurement at LEP energies, where the larger average multiplicity of $$e^ + e^ - \to q\bar q$$ events makes the suppression of this background more robust compared to lower energies.
Published: 1994

35. Measurement of Single-Photon Production in $e^{+}e^{-}$ Collisions near the $Z^{0}$ Resonance

Author: I. J. Bloodworth, Otmar Biebel, U. Müller, J. Hart, C. Dallapiccola, D. G. Charlton, D. L. Wagner, M. Settles, H. Deng, R. Humbert, J. D. Gillies, H. Mes, I. P. Duerdoth, Yoram Rozen, M. Foucher, Norbert Wermes, Sherry Towers, Andris Skuja, T. Kawamoto, C. K. Hargrove, G. W. Wilson, A. Buijs, D. M. Strom, D. Karlen, C. Stegmann, C. Burgard, H. Fukui, M. Rosvick, Tara Shears, S. Braibant, D. Axen, A. M. Rossi, F. S. Merrit, R. J. Barlow, A. Jawahery, Paul Kyberd, F. K. Loebinger, M. Yurko, H. Takeda, P. W. Jeffreys, P. A. Hart, G. D. Long, D. J. Miller, Ehud Duchovni, Gunter Wolf, Tetsuro Mashimo, Peter Sherwood, M. J. Pearce, P. Igo-Kemenes, M. Jimack, C. Darling, T. J. Smith, Gideon Bella, G. A. Snow, C. P. Ward, R. W. Springer, Alexander Wagner, H. Ihssen, A. Skillman, M. A. Thomson, R. Giacomelli, H. Jeremie, M. J. Oreglia, J. Hagemann, J. Ludwig, R. E. Hughes-Jones, D. L. Rees, H. J. Burckhart, N. I. Geddes, K. Runge, P. Bock, S. W. Gensler, E. Lefebvre, P. Bright-Thomas, A. Gaidot, P. Mättig, U. Maur, Shoji Asai, T. Wlodek, Hans-Christian Schultz-Coulon, S. J. Hillier, B. C. Shen, Jacqueline Batley, C. Y. Chang, Randall Sobie, F. Odorici, S. Wotton, R. Lahmann, Siegfried Bethke, T. Kobayashi, M. Sproston, S. L. Chu, C. M. Hawkes, Daniel Lellouch, D. C. Imrie, A. K. Honma, J. J. Ward, A. Höcker, Michael Schulz, G. D. Lafferty, Matthias Schröder, B. Poli, D. Rigby, R. J. Hemingway, J. R. Carter, G. N. Patrick, T. W. Pritchard, B. Stochausen, T. Tsukamoto, N. Tesch, B. Nijjhar, W. G. Scott, E. do Couto e Silva, H. M. Fischer, Michael Kobel, A. Michelini, D. A. Hinshaw, J. Mildenberger, W. Gorn, Guenter Duckeck, B. W. Kennedy, N. K. Watson, Erez Etzion, H. Lafoux, Shlomo Dado, Xinchou Lou, S. A. Robins, T. Hilse, R. Kowalewski, M. W. Redmond, Stefan Kluth, Shlomit Tarem, T. Behnke, P. Jovanovic, Austin Ball, V. H. Winterer, O. Runolfsson, John Allison, S. Rossberg, C. J. Oram, M. J. Losty, G. P. Siroli, J. King, Peter Krieger, Manuella Vincter, Gideon Alexander, P. Szymanski, Alessandro Montanari, W. Mohr, Paolo Capiluppi, P. Gagnon, R. P. Middleton, Giora Mikenberg, S. W. O'Neale, D. E. Plane, C. Beeston, A. Posthaus, C. Jui, K. J. Anderson, Stan Bentvelsen, James Pinfold, A. I. McNab, J. Goldberg, D. G. Fong, B. Nellen, Eilam Gross, R. G. Kellogg, R. Ströhmer, R. Mir, P. Bentkowski, Claudio Grandi, P. Le Du, B. Fabbro, P. A. Elcombe, J. A. McKenna, D. S. Koetke, P. Leblanc, G. M. Dallavalle, J. Gascon, H. von der Schmitt, Stefano Marcellini, G. T. Zorn, James Letts, P. Poffenberger, H. G. Evans, H. M. Bosch, Wolfram Dietrich Zeuner, G. Giacomelli, Christoph Schwick, J. W. Gary, Alan Watson, J. Becker, R. Bartoldus, Peter Fischer, Stephen Lloyd, Tohru Takeshita, M. J. Goodrick, Marcello Mannelli, J. E. Duboscq, I. Cohen, M. Tecchio, P. Schütz, Robert M Brown, H. O. Ogren, F. Scharf, Christoph Geich-Gimbel, T. Mori, P. Scharff-Hansen, Marco Cuffiani, J. Lauber, A. D. Schaile, W. R. Gibson, H. Przysiezniak, S. G. Clowes, F. X. Gentit, Georges Azuelos, J. E. Conboy, A. Fürtjes, M. Fierro, A. Beck, Barry King, E. Heflin, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, K. W. Bell, J. C. Hill, Misao Sasaki, F. G. Oakham, E. L. Barberio, Kiyotomo Kawagoe, P. Weber, Paolo Giacomelli, M. Hansroul, C. H. Shepherd-Themistocleous, S. Orito, R. J. Homer, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, B. Schmitt, Margret Fincke-Keeler, P. Pfister, P. S. Wells, Terry Richard Wyatt, M. Coupland, Richard Keeler, R. Howard, Claude Leroy, J. P. Pansart, T. J. McMahon, Silvia Arcelli, J. Schwiening, R.J. Akers, R. K. Carnegie, J. A. Wilson, A. Yeaman, P. D. Grannis, J. C. Clayton, O. Schaile, G. G. Hanson, A. J. Martin, F. Liu, K. Stephens, J. R. McNutt, Z. Li, J. M. Roney, P. Schenk, M. Hauschild, V. Gibson, C. Markus, M. F. Turner-Watson, M. Morii, M. S. Dixit, Frans Meijers, Peter R Hobson, D. R. Ward, Madjid Boutemeur, P. Routenburg, Gregor Herten, B. Wilkens, Sachio Komamiya, Theodoros Geralis, J. von Krogh, E. Ros, J. E. Pilcher, T. P. Kokott, A. Luig, P. G. Estabrooks, J. G. Layter, D. Hochman, Dave Robinson, M. Fanti, P. M. Watkins, R. D. Heuer, Fabrizio Fabbri, C. Charlesworth, D. Van den plas, C. Sbarra, D. R. Rust, A. M. Lee, R. Van Kooten, D. Pitman, M. H. Lehto, D. M. Gingrich, P. Berlich, Michael Dittmar, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, M. G. Rison, J. P. Martin, S. De Jong, A. M. Smith, G. Vasseur, B. Lorazo, and A. Astbury
Subjects: Physics, Particle physics, Annihilation, Photon, Physics and Astronomy (miscellaneous), Branching fraction, Electron–positron annihilation, Photon energy, Resonance (particle physics), Spectral line, Nuclear physics, High Energy Physics::Experiment, Neutrino, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: A measurement of the single photon production cross-section is presented based on a data-sample of 40.5 pb−1 collected with the OPAL detector at centre-of-mass energies within 3 GeV of the Z0 mass. Single photon events arise from initial state radiation and the production of an “invisible” final state consisting of neutrinos or possibly particles such as sneutrinos or photinos. The single photon topology is also sensitive to new Z0 decays such as $$Z^0 \to \bar vv* \to \bar vv\gamma $$ orZ 0→γX, X→invisible particles. A total of 447 single photon candidates were observed with energy exceeding 1.75 GeV in the polar angle region |cosθ
Published: 1994

36. Search for rare hadronic B decays

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

37. The OPAL silicon strip microvertex detector with two coordinate readout

Author: Jacqueline Batley, M. Yurko, Claude Leroy, V. Gibson, E. do Couto e Silva, O. Runolfsson, Paul Seller, A. K. Honma, U. C. Dunwoody, J. P. Martin, J. R. Carter, S. De Jong, D. Petry, D. S. Koetke, R. Hammarström, D. R. Rust, A. A. Carter, M. J. Goodrick, C. Moisan, R. Humbert, G. A. Beck, Phillip Allport, J. E. Duboscq, R. Mir, Gordon H. Hanson, J. F. Kral, W. Glessing, J. Lauber, F. R. Jacob, Paul Kyberd, M. Jimenez, T. W. Pritchard, D. Voillat, P.R. Goldey, Tara Shears, and A. J. Martin
Subjects: Physics, Nuclear and High Energy Physics, Vertex (computer graphics), Particle physics, Large Hadron Collider, Silicon, Physics::Instrumentation and Detectors, business.industry, Detector, chemistry.chemical_element, STRIPS, Bottom quark, law.invention, Printed circuit board, Optics, chemistry, law, High Energy Physics::Experiment, Detectors and Experimental Techniques, Collider, business, Instrumentation
Abstract: The OPAL experiment at the CERN LEP collider recently upgraded its silicon strip microvertex detector from one coordinate readout (φ only) to two coordinate readout (φ and z). This allows three dimensional vertex reconstruction and should improve lifetime measurements as well as b quark jet identification. This paper describes the new microvertex detector system with emphasis on the novel techniques and new components used to obtain the second coordinate information. These include the use of back-to-back single-sided detectors with orthogonally oriented readout strips, a gold printed circuit on a thin glass substrate to route the z strip signals to the electronics at the end of the detector, and the use of MX7 readout chips. Results on the performance of the new detector are presented.
Published: 1994

38. MEASUREMENT OF THE LEPTONIC BRANCHING RATIOS OF THE TAU-LEPTON

Author: P. G. Estabrooks, O. C. Cooke, R. K. Keeler, P. M. Watkins, G. G. Hanson, D. R. Rust, P. S. Wells, Terry Richard Wyatt, P. Schenk, N. Capdevielle, M. S. Dixit, R. W. Springer, Frans Meijers, J. von Krogh, A. M. Lee, S. L. Chu, Shlomo Dado, Tohru Takeshita, M. J. Oreglia, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, H. Mes, Stephen Lloyd, Dave Robinson, J. C. Clayton, J. P. Martin, M. Tscheulin, I. P. Duerdoth, P. Fath, M. Tecchio, Robert M Brown, Georges Azuelos, Silvia Arcelli, S. De Jong, Barry King, L. A. del Pozo, K. W. Bell, H. Przysiezniak, R. Van Kooten, J. R. Carter, G. N. Patrick, J. C. Hill, Misao Sasaki, J. G. Layter, P. Gagnon, C. Charlesworth, Otmar Biebel, B. C. Shen, T. J. Smith, K. Stephens, T. G. Shears, Gregor Herten, B. Wilkens, T. J. McMahon, Gideon Bella, D. L. Wagner, Giora Mikenberg, P. Igo-Kemenes, W. P. Lai, James Pinfold, M. Yurko, D. M. Gingrich, D. G. Fong, Siegfried Bethke, A. K. Honma, B. Nijjhar, V. Gibson, W. G. Scott, C. Dallapiccola, P. Poffenberger, J. Schwiening, R. K. Carnegie, J. P. Pansart, Gunter Wolf, F. X. Gentit, H. J. Burckhart, H. Deng, Jacqueline Batley, H. Jeremie, P. Berlich, J. Gascon, G. T. Zorn, J. A. Wilson, G. A. Beck, Ehud Duchovni, Achim Stahl, P. Teixeira-Dias, J. E. Pilcher, F. S. Merritt, J. M. Roney, Peter Fischer, R. E. Hughes-Jones, U. Maur, D. E. Plane, P. W. Jeffreys, H. M. Bosch, J. Letts, P. Schütz, M. Jimack, S. Braibant, J. D. Gillies, D. R. Ward, T. Kress, M. Fanti, M. J. Losty, E. Lefebvre, Wolfram Dietrich Zeuner, C. Sbarra, G. M. Dallavalle, R. Lahmann, J. W. Gary, D. C. Imrie, F. Palmonari, Norbert Wermes, Sherry Towers, A. Gaidot, J. Steuerer, N. J. Oldershaw, Eilam Gross, B. Schmitt, Michael Dittmar, F. Odorici, G. Yekutieli, S. W. Gensler, S. J. Hillier, T. Kawamoto, E. do Couto e Silva, R.J. Akers, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, T. Kobayashi, A. A. Carter, Ron Folman, G. P. Siroli, J. King, Roger Jones, J. A. McKenna, P. Bright-Thomas, R. Howard, Christoph Schwick, A. Yeaman, H. M. Fischer, G. A. Snow, C. P. Ward, Claude Leroy, R. D. Heuer, D. Hochman, Andris Skuja, O. Schaile, C. Y. Chang, P. Utzat, S. Orito, M. Rosvick, Fabrizio Fabbri, D. L. Rees, S. Söldner-Rembold, John Allison, G. D. Long, M. G. Rison, P. Taras, Xinchou Lou, Marco Cuffiani, Tetsuro Mashimo, R. Bartoldus, Michael Kobel, J. J. Ward, Kiyotomo Kawagoe, P. Vikas, S. Wotton, M. Starks, H. O. Ogren, A. J. Martin, R. J. Barlow, Christoph Geich-Gimbel, Margret Fincke-Keeler, Reda Tafirout, W. Gorn, Julie Kirk, H. Lafoux, R. Kowalewski, D. J. Miller, G. W. Wilson, P. Weber, T. Behnke, T. Hilse, A. Michelini, A. Buijs, D. M. Strom, M. Hauschild, C. Stegmann, O. Runolfsson, K. Ametewee, O. Tousignant, P. Scharff-Hansen, J. E. Conboy, A. Fürtjes, Sachio Komamiya, H. Fukui, C. Markus, Theodoros Geralis, Gideon Alexander, Dave Charlton, E. Ros, A. T. Watson, W. R. Gibson, Paolo Capiluppi, C. Beeston, S. W. O'Neale, A. Beck, K. J. Anderson, E. Heflin, Claudio Grandi, A. M. Smith, Lorne Levinson, D. Axen, A. Jawahery, G. Vasseur, R. Bürgin, B. Fabbro, P. D. Phillips, R. G. Kellogg, B. Lorazo, Gilles Beaudoin, A. Skillman, Peter Sherwood, G. Giacomelli, Alexander Wagner, J. Hagemann, S. G. Clowes, J. Ludwig, M. Fierro, J. E.G. Edwards, A. I. McNab, J. Goldberg, K. Runge, P. Bock, R. Mir, T. P. Kokott, A. Luig, B. Nellen, P. Leblanc, J. Lauber, Paolo Giacomelli, M. Hansroul, H. G. Evans, M. J. Goodrick, H. Takeda, C. H. Shepherd-Themistocleous, I. Cohen, F. G. Oakham, Stefano Marcellini, S. A. Robins, R. J. Homer, Erez Etzion, Stefan Kluth, Shlomit Tarem, E. L. Barberio, C. J. Oram, M. F. Turner-Watson, M. Morii, Peter R Hobson, R. P. Middleton, P. Routenburg, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, M. W. Redmond, A. M. Rossi, C. Darling, B. Stockhausen, Paul Kyberd, F. K. Loebinger, N. I. Geddes, N. L. Rodning, B. Poli, P. Szymanski, P. Mättig, R. Giacomelli, C. Jui, Shoji Asai, Stan Bentvelsen, Matthias Schröder, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, A. S. Turcot, V. Zacek, V. H. Winterer, I. J. Bloodworth, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, P. A. Hart, M. Settles, T. W. Pritchard, Yoram Rozen, M. J. Pearce, M. Foucher, Guenter Duckeck, Junichi Kanzaki, D. Karlen, C. Burgard, U. Müller, C. K. Hargrove, N. K. Watson, W. Mohr, A. Posthaus, W. Matthews, M. A. Thomson, T. Wlodek, M. Sproston, T. Tsukamoto, N. Tesch, P. A. Elcombe, F. Scharf, A. D. Schaile, and Madjid Boutemeur
Subjects: Nuclear physics, Physics, Particle physics, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, High Energy Physics::Experiment, Engineering (miscellaneous), Particle Physics - Experiment, Lepton
Abstract: The leptonic branching ratios of the tau lepton have been determined from data collected by the OPAL detector in 1991 and 1992. From a sample of 27196 e+e−→τ+τ− candidates we find 7322$\tau \to e\nu \bar \nu$ and 7941$\tau \to \mu \nu \bar \nu$ candidates. Using efficiency and background estimates determined from a study of Monte Carlo events and control samples of data, the branching ratios$B(\tau \to e\nu \bar \nu )$=(18.14±0.20±0.28)% and$B(\tau \to \mu \nu \bar \nu )$=(17.48±0.18±0.23)% have been obtained. These new results have been combined with the published results for the 1990 OPAL data to yield the following branching ratios for data taken between 1990 and 1992: $$\begin{gathered} B(\tau \to e\nu \bar \nu ) = (18.04 \pm 0.33)\% , \hfill \\ B(\tau \to \mu \nu \bar \nu ) = (17.36 \pm 0.27)\% . \hfill \\ \end{gathered} $$ These leptonic branching ratios are used with other properties of the muon and tau-lepton to test the universality of charged current leptonic couplings in these decays. The ratio$R_\tau = B(\tau \to hadrons + \nu _\tau )/B(\tau \to e\bar \nu _e \nu _\tau )$ is calculated using our measured values of the leptonic branching fractions of the tau and tau lifetime from which a value of αs(Q2=Mτ2) is extracted. The value of αs(Q2=MZ2) is obtained byQ2 evolution and agrees with the value from the Z0 line shape analysis.

39. THE PRODUCTION OF NEUTRAL KAONS IN Z(0) DECAYS AND THEIR BOSE-EINSTEIN CORRELATIONS

Author: C. Y. Chang, P. Taras, Michael Kobel, Julie Kirk, H. Lafoux, G. W. Wilson, M. Hauschild, C. M. Hawkes, Daniel Lellouch, C. Markus, J. Steuerer, W. Matthews, Takehiko Mori, R. Mir, H. Mes, I. P. Duerdoth, R. Bartoldus, N. J. Oldershaw, M. A. Thomson, J. Lauber, P. Fath, T. J. McMahon, V. Zacek, J. Schwiening, R.J. Akers, R. K. Carnegie, N. I. Geddes, H. Takeda, J. A. Wilson, Silvia Arcelli, Andris Skuja, Marco Cuffiani, F. G. Oakham, Richard Keeler, M. J. Oreglia, O. Schaile, E. L. Barberio, E. K. U. Gross, T. Behnke, A. Gaidot, N. L. Rodning, G. D. Long, H. O. Ogren, Christoph Geich-Gimbel, Tetsuro Mashimo, S. L. Chu, T. Wlodek, M. Sproston, B. Poli, B. C. Shen, D. R. Rust, M. Starks, E. Lefebvre, W. P. Lai, R. Howard, Gunter Wolf, Claude Leroy, A. J. Martin, P. Igo-Kemenes, G. N. Patrick, F. Odorici, J. P. Pansart, C. Dallapiccola, T. Tsukamoto, N. Tesch, Siegfried Bethke, J. M. Roney, A. M. Lee, H. Jeremie, H. M. Fischer, A. K. Honma, J. D. Gillies, G. D. Lafferty, W. G. Scott, Otmar Biebel, D. Axen, N. K. Watson, D. L. Wagner, Madjid Boutemeur, A. Jawahery, S. Braibant, R. E. Hughes-Jones, U. Maur, S. Wotton, W. Gorn, Hans-Christian Schultz-Coulon, M. F. Turner-Watson, Randall Sobie, Michael Schulz, F. X. Gentit, P. G. Estabrooks, J. E. Conboy, A. Michelini, A. Fürtjes, O. Tousignant, Gregor Herten, Peter Sherwood, M. Morii, H. Deng, I. J. Bloodworth, Kiyotomo Kawagoe, P. S. Wells, Peter R Hobson, Alexander Wagner, R. Van Kooten, S. A. Robins, V. Gibson, D. J. Miller, P. Routenburg, B. Wilkens, J. Hagemann, J. Ludwig, K. Runge, P. Bock, T. W. Pritchard, J. Letts, W. Mohr, P. M. Watkins, C.J. Beeston, P. Weber, E. do Couto e Silva, A. Posthaus, J. E. Pilcher, P. Gagnon, D. Rigby, R. J. Hemingway, M. Settles, M. J. Losty, Yoram Rozen, J. Allison, Norbert Wermes, Sherry Towers, T. Kawamoto, M. Foucher, James Pinfold, D. M. Gingrich, J. R. Carter, Erez Etzion, F. S. Merritt, B. W. Kennedy, David Robinson, Stefan Kluth, D. G. Fong, Shlomit Tarem, P. Berlich, P. Jovanovic, G. A. Snow, C. P. Ward, G. T. Zorn, Guenter Duckeck, S. W. O'Neale, S. Orito, M. Rosvick, R. G. Kellogg, R. Lahmann, J. Gascon, K. J. Anderson, D. C. Imrie, P. A. Elcombe, D. L. Rees, S. Söldner-Rembold, A. Yeaman, M. Fanti, H. M. Bosch, Austin Ball, Peter Krieger, Wolfram Dietrich Zeuner, C. J. Oram, Manuella Vincter, Alessandro Montanari, A. S. Turcot, Junichi Kanzaki, Sachio Komamiya, Theodoros Geralis, E. Ros, A. Buijs, D. M. Strom, C. Stegmann, H. Fukui, D. Karlen, C. Burgard, R. W. Springer, G. P. Siroli, J. King, V. H. Winterer, Stefano Marcellini, Christoph Schwick, J. W. Gary, T. P. Kokott, A. Luig, Tohru Takeshita, D. S. Koetke, J. A. McKenna, R. P. Middleton, R. D. Heuer, A. I. McNab, Marcello Mannelli, J. E. Duboscq, J. Goldberg, A. M. Rossi, B. Nellen, F. Scharf, P. Poffenberger, Georges Azuelos, A. D. Schaile, Fabrizio Fabbri, C. Darling, T. J. Smith, Barry King, P. Scharff-Hansen, P. Szymanski, P. Leblanc, K. W. Bell, Peter Fischer, P. Schütz, P. Mättig, Shoji Asai, J. C. Hill, C. Jui, Stan Bentvelsen, Shlomo Dado, A. M. Smith, Misao Sasaki, G. Vasseur, B. Lorazo, H. G. Evans, M. J. Goodrick, I. Cohen, M. W. Redmond, Giora Mikenberg, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. Giacomelli, O. C. Cooke, N. Capdevielle, J. von Krogh, L. A. del Pozo, C. Sbarra, Michael Dittmar, G. Yekutieli, A. A. Carter, Ron Folman, Roger Jones, P. Utzat, M. G. Rison, T. Hilse, O. Runolfsson, J. G. Layter, Reda Tafirout, Claudio Grandi, C. Charlesworth, Matthias Schröder, T. R. Wyatt, R. J. Barlow, Ehud Duchovni, D. E. Plane, S. G. Clowes, M. Fierro, J. E.G. Edwards, M. Jimack, M. Yurko, P. W. Jeffreys, F. Palmonari, G. M. Dallavalle, G. G. Hanson, S. W. Gensler, S. J. Hillier, T. Kobayashi, P. Bright-Thomas, Alan Watson, J. J. Ward, P. Vikas, U. Müller, G. Giacomelli, W. R. Gibson, P. Schenk, A. Beck, E. Heflin, Stephen Lloyd, M. Tecchio, Lorne Levinson, Robert M Brown, M. S. Dixit, P. D. Phillips, Frans Meijers, Gilles Beaudoin, A. Skillman, C. K. Hargrove, P. E.L. Clarke, R. Kowalewski, U. C. Dunwoody, M. K. Jones, Tara Shears, J. P. Martin, M. Tscheulin, S. De Jong, K. Ametewee, Gideon Alexander, Paolo Capiluppi, H. Przysiezniak, P. A. Hart, B. Nijjhar, M. J. Pearce, K. Stephens, Paolo Giacomelli, M. Hansroul, C. H. Shepherd-Themistocleous, R. J. Homer, D. R. Ward, T. Kress, G. A. Beck, Achim Stahl, P. Teixeira-Dias, D. Hochman, Gideon Bella, H. J. Burckhart, Jacqueline Batley, Xinchou Lou, B. Schmitt, J. C. Clayton, Dave Charlton, Margret Fincke-Keeler, R. Bürgin, and B. Fabbro
Subjects: Physics, Particle physics, Annihilation, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Monte Carlo method, Hadron, Elementary particle, Bose–Einstein correlations, Nuclear physics, High Energy Physics::Experiment, Quantum field theory, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The production of neutral kaons in e+e− annihilation at centre-of-mass energies in the region of the Z0 mass and their Bose-Einstein correlations are investigated with the OPAL detector at LEP. A total of about 1.26×106 Z0 hadronic decay events are used in the analysis. The production rate of K0 mesons is found to be 1.99±0.01±0.04 per hadronic event, where the first error is statistical and the second systematic. Both the rate and the differential cross section for K0 production are compared to the predictions of Monte Carlo generators. This comparison indicates that the fragmentation is too soft in bothJetset andHerwig. Bose-Einstein correlations in Ks0Ks0 pairs are measured through the quantityQ, the four momentum difference of the pair. A threshold enhancement is observed in Ks0Ks0 pairs originating from a mixed sample of$K^0 \bar K^0$ and K0K0 ($\bar K^0 \bar K^0$) pairs. For the strength of the effect and for the radius of the emitting source we find values of λ=1.14±0.23±0.32 andR0=(0.76±0.10±0.11) fm respectively. The first error is statistical and the second systematic.

40. A STUDY OF CHARM MESON PRODUCTION IN SEMILEPTONIC B-DECAYS

Author: R. Lahmann, D. C. Imrie, N. J. Oldershaw, Gunter Wolf, M. Settles, T. Hilse, Yoram Rozen, R.J. Akers, D. E. Plane, G. P. Siroli, J. King, O. Runolfsson, M. Foucher, Christoph Schwick, O. Schaile, C. Beeston, S. Wotton, G. M. Dallavalle, Reda Tafirout, Claudio Grandi, P. Igo-Kemenes, Paolo Giacomelli, M. Fanti, T. Behnke, M. Starks, A. J. Martin, A. I. McNab, J. Goldberg, J. Steuerer, H. Jeremie, Junichi Kanzaki, D. Karlen, Alan Watson, U. Müller, H. Mes, I. P. Duerdoth, Eilam Gross, R. E. Hughes-Jones, U. Maur, C. Burgard, Madjid Boutemeur, C. H. Shepherd-Themistocleous, Kiyotomo Kawagoe, B. Nellen, A. Jawahery, P. Fath, R. J. Homer, R. W. Springer, K. Stephens, P. Weber, Otmar Biebel, Gregor Herten, P. Leblanc, C. M. Hawkes, W. R. Gibson, A. Beck, E. do Couto e Silva, Daniel Lellouch, D. L. Wagner, C. K. Hargrove, H. M. Fischer, G. A. Beck, Achim Stahl, P. Teixeira-Dias, S. G. Clowes, E. Heflin, Lorne Levinson, P. D. Phillips, Gilles Beaudoin, A. Skillman, Tohru Takeshita, G. G. Hanson, H. G. Evans, M. J. Goodrick, I. Cohen, R. D. Heuer, Shlomo Dado, P. Poffenberger, H. Deng, Fabrizio Fabbri, Dave Charlton, B. Wilkens, Matthias Schröder, Peter Fischer, M. Fierro, P. Schütz, B. Schmitt, T. Kobayashi, J. E.G. Edwards, M. Yurko, V. Zacek, Marco Cuffiani, P. G. Estabrooks, A. S. Turcot, Georges Azuelos, J. Letts, P. W. Jeffreys, James Pinfold, D. G. Fong, J. Gascon, J. E. Pilcher, Tara Shears, V. H. Winterer, Erez Etzion, R. Van Kooten, A. Michelini, Barry King, Stefan Kluth, D. Axen, Shlomit Tarem, Norbert Wermes, G. W. Wilson, Sherry Towers, T. Kawamoto, R. Bürgin, P. Le Du, B. Fabbro, S. L. Chu, P. Bright-Thomas, Margret Fincke-Keeler, P. A. Hart, M. Hauschild, C. Y. Chang, C. J. Oram, K. W. Bell, P. M. Watkins, V. Gibson, Peter Sherwood, G. Giacomelli, P. Taras, R. P. Middleton, P. Schenk, S. Orito, Alexander Wagner, C. Markus, Michael Kobel, E. Lefebvre, M. J. Pearce, Giora Mikenberg, M. Rosvick, J. J. Ward, Gideon Bella, P. Vikas, J. C. Hill, Misao Sasaki, Richard Keeler, I. Mori, Hans-Christian Schultz-Coulon, F. Odorici, J. Hagemann, Julie Kirk, H. Lafoux, S. A. Robins, M. W. Redmond, J. Ludwig, C. Darling, H. J. Burckhart, T. J. Smith, Jacqueline Batley, B. C. Shen, Randall Sobie, Michael Schulz, G. D. Lafferty, D. M. Gingrich, J. W. Gary, K. Runge, P. Bock, M. S. Dixit, Silvia Arcelli, D. R. Ward, D. S. Koetke, T. Kress, Frans Meijers, K. Ametewee, P. Berlich, O. Tousignant, P. Mättig, Shoji Asai, John Allison, M. Hausroul, S. Braibant, Siegfried Bethke, A. K. Honma, B. Nijjhar, T. W. Pritchard, Marcello Mannelli, J. E. Duboscq, Gideon Alexander, W. G. Scott, P. E.L. Clarke, M. J. Oreglia, U. C. Dunwoody, M. K. Jones, Andris Skuja, S. W. O'Neale, P. Gagnon, J. P. Martin, D. R. Rust, W. P. Lai, Paolo Capiluppi, M. Tscheulin, K. J. Anderson, Guenter Duckeck, Xinchou Lou, G. D. Long, Tetsuro Mashimo, R. G. Kellogg, S. De Jong, R. Kowalewski, J. R. Carter, J. M. Roney, A. M. Lee, G. N. Patrick, Stefano Marcellini, E. X. Gentit, P. Szymanski, H. Przysiezniak, G. A. Snow, C. P. Ward, D. L. Rees, M. J. Losty, S. Söldner-Rembold, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Ehud Duchovni, C. Jui, D. Hochman, Stan Bentvelsen, G. T. Zorn, W. Gorn, R. Giacomelli, H. M. Bosch, J. C. Clayton, M. Jimack, Wolfram Dietrich Zeuner, N. I. Geddes, S. W. Gensler, S. J. Hillier, P. Scharff-Hansen, N. L. Rodning, A. M. Smith, G. Vasseur, B. Poli, B. Lorazo, Stephen Lloyd, M. Tecchio, Robert M Brown, R. Howard, Claude Leroy, J. P. Pansart, A. M. Rossi, T. J. McMahon, J. Schwiening, A. Buijs, R. K. Carnegie, D. M. Strom, C. Stegmann, M. Diumar, H. Fukui, J. A. Wilson, A. Yeaman, Sachio Komamiya, Theodoros Geralis, E. Ros, T. P. Kokott, A. Luig, Z. Li, P. S. Wells, M. F. Turner-Watson, O. C. Cooke, M. Morii, Peter R Hobson, Terry Richard Wyatt, P. Routenburg, R. Bartoldus, N. Capdevielle, J. von Krogh, H. O. Ogren, Christoph Geich-Gimbel, Dave Robinson, L. A. del Pozo, J. E. Conboy, A. Fürtjes, C. Sbarra, G. Yekutieli, F. S. Merritt, A. A. Carter, Ron Folman, Roger Jones, P. Utzat, J. A. McKenna, M. G. Rison, N. K. Watson, W. Mohr, A. Posthaus, P. A. Elcombe, F. Scharf, A. D. Schaile, W. Matthews, M. A. Thomson, A. Gaidot, T. Wlodek, M. Sproston, T. Tsukamoto, N. Tesch, C. Dallapiccola, J. D. Gillies, R. J. Barlow, D. J. Miller, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, R. Mir, J. Lauber, H. Takeda, F. G. Oakham, E. L. Barberio, J. G. Layter, C. Charlesworth, and I. J. Bloodworth
Subjects: Physics, Nuclear physics, Particle physics, Meson production, Muon, Physics and Astronomy (miscellaneous), Electron–positron annihilation, Hadron, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: The results of a study of charm meson production in semileptonic B hadron decays are presented. Based on a sample of 1.72 million hadronic Z0 decays the following product branching ratios (averaged over electrons and muons) are obtained: $$\begin{gathered} B(b \to D^ + \ell X) \cdot B(D^ + \to K^ - \pi ^ + \pi ^ + ) \hfill \\ = (1.82 \pm 0.20 \pm 0.12) \times 10^{ - 3} , \hfill \\ B(b \to D^0 \ell X) \cdot B(D^0 \to K^ - \pi ^ + ) \hfill \\ = (2.52 \pm 0.14 \pm 0.17) \times 10^{ - 3} \hfill \\ B(b \to D^* \ell X) \cdot B(D^{* + } \to D^0 \pi ^ + ) \cdot B(D^0 \to K^ - \pi ^ + ) \hfill \\ = (7.53 \pm 0.47 \pm 0.56) \times 10^{ - 4} \hfill \\ \end{gathered} $$ where the first error is statistical and the second systematic.

41. Search for charged Higgs bosons using the OPAL detector at LEP

Author: M. Hapke, Siegfried Bethke, A. K. Honma, D. E. Hutchcroft, B. Nijjhar, W. G. Scott, C. Dallapiccola, N. J. Oldershaw, D. R. Rust, A. M. Lee, O. Schaile, M. Tecchio, E. von Törne, K. Ametewee, R. Kowalewski, N. K. Watson, Gideon Alexander, Paolo Capiluppi, Dezso Horvath, M. J. Losty, Jean-Arcady Meyer, N. Altekamp, M. J. Oreglia, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, V. Zacek, E. Lefebvre, R. J. Barlow, D. J. Miller, C. Darling, T. J. Smith, P. Mättig, Shoji Asai, J. R. Carter, O. C. Cooke, F. Odorici, G. W. Wilson, M. Hauschild, G. N. Patrick, J. Palinkas, C. Hartmann, D. E. Plane, Ehud Duchovni, C. Markus, W. Mohr, A. Posthaus, P. Scharff-Hansen, R. W. Springer, T. Hilse, J. von Krogh, M. Jimack, Yoram Rozen, Shlomo Dado, G. M. Dallavalle, Otmar Biebel, O. Runolfsson, M. Foucher, T. Behnke, Gideon Bella, E. H. Vokurka, F. Palmonari, R. J. Hawkings, F. S. Merritt, J. Steuerer, C. H. Shepherd-Themistocleous, H. J. Burckhart, R. D. Heuer, L. A. del Pozo, C. Sbarra, D. Karlen, P. Gagnon, Tara Shears, D. Rigby, R. J. Hemingway, S. W. Gensler, C. Burgard, D. L. Wagner, Fabrizio Fabbri, Alan Watson, Eilam Gross, C. Beeston, S. J. Hillier, E. Tsur, Richard Keeler, Jacqueline Batley, Claudio Grandi, B. W. Kennedy, R. Van Kooten, K. W. Bell, P. Jovanovic, U. C. Dunwoody, Austin Ball, Giora Mikenberg, D. L. Rees, W. R. Gibson, G. Yekutieli, Peter Krieger, A. Sittler, I. J. Blood worth, J. C. Hill, G. Azuelos, P. A. Hart, B. T. Bouwens, Gregor Herten, Misao Sasaki, A. A. Carter, J. Bechtluft, J. A. McKenna, F. Scharf, Manuella Vincter, Alessandro Montanari, Stefan Kluth, F. Wäckerle, German Martinez, Richard Nisius, Ron Folman, Roger Jones, A. M. Smith, Shlomit Tarem, D. M. Gingrich, H. M. Bosch, T. Omori, S. W. O'Neale, B. Wilkens, M. J. Pearce, Lorne Levinson, U. Jost, R. Mir, H. Mes, I. P. Duerdoth, K. J. Anderson, A. D. Schaile, R. Howard, D. Chrisman, J. Letts, Marco Cuffiani, W. Matthews, P. Berlich, P. D. Phillips, B. J. King, Gilles Beaudoin, P. Utzat, S. L. Chu, S. Braibant, Gabriella Pasztor, J. Lauber, J. P. Pansart, A. Skillman, R. Bartoldus, P. Fath, C. Y. Chang, M. A. Thomson, J. E. Pilcher, M. G. Rison, H. Takeda, Norbert Wermes, Sherry Towers, G. Vasseur, B. Lorazo, John Allison, C. J. Oram, T. Kawamoto, G. A. Snow, C. P. Ward, F. G. Oakham, P. Taras, H. O. Ogren, Christoph Geich-Gimbel, Michael Kobel, Stephen Lloyd, S. Söldner-Rembold, E. L. Barberio, S. G. Clowes, M. Fierro, T. Wlodek, M. Sproston, T. J. McMahon, D. M. Strom, J. Schwiening, J. E. Conboy, Robert M Brown, J. E.G. Edwards, C. Stegmann, R. K. Carnegie, S. Orito, F. Strumia, Reda Tafirout, Julie Kirk, Matthias Schröder, T. Tsukamoto, N. Tesch, A. I. McNab, H. Fukui, J. A. Wilson, R. Rylko, M. Rosvick, J. Goldberg, Ekg Sarkisyan, P. W. Jeffreys, A. Fürtjes, P. Poffenberger, James Pinfold, B. Nellen, T. Kobayashi, P. Schütz, D. G. Fong, C. Lewis, P. Bright-Thomas, D. Axen, P. S. Wells, A. Jawahery, A. Gaidot, Dave Charlton, J. J. Ward, P. Vikas, J. Gascon, U. Müller, Terry Richard Wyatt, J. E. Bloomer, Peter Sherwood, D. Lanske, A. J. Martin, H. G. Evans, Alexander Wagner, M. J. Goodrick, I. Cohen, J. Ludwig, K. Runge, P. Bock, R. G. Kellogg, C. K. Hargrove, Gunter Wolf, F. X. Gentit, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, Csaba Hajdu, S. Wotton, R. Bürgin, B. Fabbro, A. Malik, Stefano Marcellini, J. W. Gary, D. S. Koetke, R. Lahmann, D. C. Imrie, M. Palazzo, G. Giacomelli, Marcello Mannelli, Andris Skuja, G. P. Siroli, J. King, Sachio Komamiya, G. D. Long, Tetsuro Mashimo, Theodoros Geralis, E. Ros, B. Stockhausen, Paul Kyberd, F. K. Loebinger, Joleen Pater, T. P. Kokott, W. Gorn, A. Luig, P. Weber, R. Giacomelli, A. Joly, S. Yamashita, P. Igo-Kemenes, Margret Fincke-Keeler, H. Jeremie, R. E. Hughes-Jones, E. do Couto e Silva, Sven Menke, G. A. Beck, Achim Stahl, P. E.L. Clarke, M. K. Jones, B. Schmitt, J. P. Martin, M. Tscheulin, S. De Jong, Paolo Giacomelli, M. Hansroul, H. Przysiezniak, R. J. Homer, A. N. Bell, N. I. Geddes, Michael Hildreth, N. L. Rodning, B. Poli, J. G. Layter, H. M. Fischer, A. Michelini, C. Charlesworth, S. A. Robins, Stefania Xella, G. G. Hanson, S. M. Gascon-Shotkin, P. Schenk, A. M. Rossi, M. S. Dixit, Frans Meijers, Silvia Arcelli, E. A. Mckigney, W. P. Lai, J. M. Roney, Madjid Boutemeur, P. G. Estabrooks, M. St arks, P. M. Watkins, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, G. D. Lafferty, T. W. Pritchard, Guenter Duckeck, A. S. Turcot, S. B. Anderson, P. Szymanski, Stan Bentvelsen, K. Stephens, V. Gibson, D. R. Ward, H. Lafoux, T. Kress, Frank Fiedler, D. Hochman, W. J. McDonald, and B. C. Shen
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Luminosity (scattering theory), Electron–positron annihilation, High Energy Physics::Phenomenology, Detector, Upper and lower bounds, Lower limit, Nuclear physics, Higgs boson, High Energy Physics::Experiment, Particle Physics - Experiment, Boson
Abstract: A search is described to detect charged Higgs bosons via the process Z0 → H+H−, using data collected by the OPAL detector at LEP which correspond to an integrated luminosity of approximately 110 pb−1. It is assumed that the H+ boson decays only to τ+ντ and cs final states. From the negative outcome of this search a lower bound of 44.1 GeV (95% CL) is derived for the mass of the charged Higgs boson.

42. INCLUSIVE STRANGE VECTOR AND TENSOR MESON PRODUCTION IN HADRONIC Z(0) DECAYS

Author: G. D. Long, Otmar Biebel, A. S. Turcot, Tetsuro Mashimo, D. L. Wagner, W. Gorn, V. H. Winterer, H. Deng, J. G. Layter, P. A. Elcombe, Gregor Herten, J. Letts, D. Hochman, C. Charlesworth, Madjid Boutemeur, B. Wilkens, J. P. Pansart, Tara Shears, Norbert Wermes, Sherry Towers, T. Kawamoto, Richard Keeler, Kiyotomo Kawagoe, P. Szymanski, P. A. Hart, C. Jui, Stan Bentvelsen, Hans-Christian Schultz-Coulon, J. E. Pilcher, Randall Sobie, Michael Schulz, G. D. Lafferty, M. J. Pearce, T. W. Pritchard, Guenter Duckeck, P. Scharff-Hansen, R. Bartoldus, A. I. McNab, J. C. Clayton, S. Orito, M. Rosvick, J. Goldberg, R. Howard, Claude Leroy, F. Scharf, C. Y. Chang, J. Steuerer, P. Igo-Kemenes, A. M. Smith, B. Nellen, C. Sbarra, U. Müller, P. Leblanc, A. D. Schaile, G. Vasseur, B. Lorazo, T. Hilse, P. G. Estabrooks, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, J. P. Martin, M. Tscheulin, P. Weber, H. O. Ogren, Christoph Geich-Gimbel, E. Lefebvre, B. C. Shen, S. De Jong, G. W. Wilson, M. Fanti, H. Jeremie, M. F. Turner-Watson, P. Taras, H. G. Evans, M. Morii, James Pinfold, M. J. Goodrick, I. Cohen, F. Odorici, Siegfried Bethke, M. Hauschild, H. Przysiezniak, Peter R Hobson, C. K. Hargrove, A. M. Rossi, S. Braibant, M. J. Oreglia, R. E. Hughes-Jones, D. G. Fong, O. Runolfsson, U. Maur, Paolo Giacomelli, A. K. Honma, J. Gascon, D. E. Plane, B. Nijjhar, W. G. Scott, M. Hansroul, W. Matthews, Michael Kobel, C. Markus, K. Stephens, M. A. Thomson, Matthias Schröder, P. Routenburg, Michael Dittmar, A. Buijs, D. M. Strom, C. Stegmann, Erez Etzion, G. G. Hanson, Marco Cuffiani, Stefan Kluth, G. Yekutieli, J. E. Conboy, E. K. U. Gross, C. H. Shepherd-Themistocleous, T. Wlodek, M. Sproston, J. W. Gary, J. R. Carter, D. S. Koetke, N. J. Oldershaw, Marcello Mannelli, J. E. Duboscq, C. Dallapiccola, G. N. Patrick, C. Beeston, P. M. Watkins, H. Fukui, G. A. Snow, C. P. Ward, Shlomit Tarem, G. M. Dallavalle, G. Giacomelli, Stephen Lloyd, A. Fürtjes, R.J. Akers, C. J. Oram, M. J. Losty, B. Stockhausen, Paul Kyberd, F. K. Loebinger, R. J. Homer, D. L. Rees, P. Schenk, Sachio Komamiya, M. Tecchio, Theodoros Geralis, E. Ros, S. Söldner-Rembold, Margret Fincke-Keeler, M. S. Dixit, J. D. Gillies, Frans Meijers, V. Gibson, R. P. Middleton, N. I. Geddes, Ehud Duchovni, R. D. Heuer, Fabrizio Fabbri, M. Jimack, S. L. Chu, Alan Watson, Julie Kirk, H. Lafoux, E. do Couto e Silva, T. Tsukamoto, N. Tesch, N. K. Watson, Gunter Wolf, F. X. Gentit, H. Mes, D. R. Ward, T. Kress, T. P. Kokott, Claudio Grandi, R. Lahmann, D. C. Imrie, A. Luig, F. Palmonari, N. L. Rodning, O. Schaile, S. W. Gensler, S. J. Hillier, T. Kobayashi, R. W. Springer, S. Wotton, F. S. Merritt, P. S. Wells, D. R. Rust, Tohru Takeshita, I. P. Duerdoth, P. Fath, Shlomo Dado, A. A. Carter, Ron Folman, R. Giacomelli, Roger Jones, R. J. Barlow, D. J. Miller, B. Poli, Terry Richard Wyatt, G. P. Siroli, J. King, W. Mohr, Christoph Schwick, M. Starks, P. Poffenberger, A. Posthaus, Georges Azuelos, Barry King, A. J. Martin, A. M. Lee, P. Utzat, Reda Tafirout, R. Kowalewski, Gideon Bella, K. W. Bell, Giora Mikenberg, John Allison, Peter Fischer, J. C. Hill, Misao Sasaki, R. Mir, H. J. Burckhart, G. A. Beck, M. G. Rison, K. Ametewee, H. M. Fischer, Achim Stahl, Jacqueline Batley, P. Teixeira-Dias, A. Michelini, Gideon Alexander, P. Schütz, J. Lauber, Paolo Capiluppi, A. Yeaman, R. Van Kooten, J. A. McKenna, R. G. Kellogg, A. Gaidot, T. J. McMahon, H. Takeda, S. A. Robins, W. R. Gibson, Stefano Marcellini, F. G. Oakham, B. Schmitt, E. L. Barberio, D. M. Gingrich, D. Rigby, R. J. Hemingway, A. Beck, J. Schwiening, P. Berlich, E. Heflin, Xinchou Lou, O. Tousignant, R. K. Carnegie, R. M. Brown, Lorne Levinson, M. W. Redmond, B. W. Kennedy, P. Jovanovic, P. D. Phillips, Austin Ball, Peter Krieger, Gilles Beaudoin, J. A. Wilson, Manuella Vincter, A. Skillman, Alessandro Montanari, S. W. O'Neale, Dave Charlton, K. J. Anderson, R. Bürgin, B. Fabbro, O. C. Cooke, N. Capdevielle, J. von Krogh, Dave Robinson, L. A. del Pozo, Silvia Arcelli, W. P. Lai, J. M. Roney, T. Behnke, D. Axen, A. Jawahery, Peter Sherwood, S. G. Clowes, M. Fierro, J. E.G. Edwards, M. Yurko, P. W. Jeffreys, Alexander Wagner, J. Hagemann, J. Ludwig, K. Runge, P. Bock, P. Bright-Thomas, J. J. Ward, P. Vikas, P. Gagnon, G. T. Zorn, H. M. Bosch, Wolfram Dietrich Zeuner, C. Darling, T. J. Smith, P. Mättig, Shoji Asai, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, V. Zacek, I. J. Bloodworth, M. Settles, Yoram Rozen, M. Foucher, Junichi Kanzaki, D. Karlen, C. Burgard, and Andris Skuja
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, Elementary particle, State (functional analysis), Nuclear physics, Field theory (psychology), Tensor, Quantum field theory, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Measurements have been made in the OPAL experiment at LEP of the inclusive production of strange vector φ(1020) and K*(892)0 mesons, and the tensor meson K2*(1430)0. The overall production rates per hadronic Z0 decay have been determined to be 0.100±0.004stat.±0.007syst. φ(1020) mesons, 0.74±0.03stat.±0.03syst. K*(892)0 mesons and (forxE

43. IMPROVED MEASUREMENTS OF THE B-0 AND B+ MESON LIFETIMES

Author: Silvia Arcelli, Sachio Komamiya, Theodoros Geralis, R. Bartoldus, T. J. Smith, O. Tousignant, A. T. Watson, S. W. O'Neale, C. Y. Chang, K. J. Anderson, P. Taras, Michael Kobel, Julie Kirk, G. G. Hanson, H. O. Ogren, Christoph Geich-Gimbel, K. Stephens, H. Mes, T. P. Kokott, A. Luig, G. Giacomelli, I. P. Duerdoth, T. Hilse, R. W. Springer, P. Schenk, A. I. McNab, P. Poffenberger, Peter Fischer, P. Fath, P. Schütz, Dave Charlton, W. P. Lai, J. M. Roney, Tohru Takeshita, Otmar Biebel, Claudio Grandi, M. Yurko, R. W. L. Jones, P. W. Jeffreys, P. Scharff-Hansen, W. R. Gibson, G. D. Lafferty, J. Goldberg, B. Nellen, Madjid Boutemeur, P. S. Wells, Georges Azuelos, Barry King, C. M. Hawkes, M. S. Dixit, P. Gagnon, F. X. Gentit, Margret Fincke-Keeler, J. E. Conboy, A. Fürtjes, R. Bürgin, B. Fabbro, R. Van Kooten, Frans Meijers, T. J. McMahon, A. Beck, D. L. Wagner, K. W. Bell, R. Kowalewski, E. Lefebvre, E. Heflin, P. G. Estabrooks, R. K. Keeler, C.J. Beeston, J. G. Layter, Gregor Herten, T. G. Shears, J. Allison, P. Leblanc, P. Bright-Thomas, F. Odorici, S. Braibant, J. C. Hill, Misao Sasaki, K. Ametewee, D. R. Ward, J. Schwiening, A. M. Smith, A. M. Rossi, T. Kress, D. M. Gingrich, Gideon Alexander, R. K. Carnegie, F. S. Merritt, D. Rigby, R. J. Hemingway, J. Steuerer, B. C. Shen, Lorne Levinson, P. M. Watkins, P. Berlich, J. J. Ward, Siegfried Bethke, Paolo Capiluppi, P. Vikas, M. A. Thomson, A. K. Honma, W. G. Scott, G. Vasseur, H. M. Fischer, C. Darling, P. D. Phillips, Kiyotomo Kawagoe, C. Charlesworth, B. W. Kennedy, H. G. Evans, M. Fanti, A. Michelini, Gideon Bella, G. T. Zorn, J. A. Wilson, Gilles Beaudoin, P. Igo-Kemenes, H. Deng, Fabrizio Fabbri, J. Letts, A. Skillman, P. E.L. Clarke, H. J. Burckhart, D. R. Rust, Jacqueline Batley, Norbert Wermes, P. Jovanovic, B. Lorazo, Andris Skuja, M. J. Goodrick, I. Cohen, Austin Ball, Peter Krieger, Manuella Vincter, Alessandro Montanari, U. C. Dunwoody, M. K. Jones, Ehud Duchovni, Sherry Towers, H. Jeremie, T. Kawamoto, A. D. Schaile, A. S. Turcot, T. R. Wyatt, M. Jimack, J. P. Martin, R. Mir, R. E. Hughes-Jones, G. D. Long, Tetsuro Mashimo, J. A. McKenna, H. M. Bosch, A. M. Lee, U. Maur, S. Orito, M. Tscheulin, S. A. Robins, R. J. Barlow, Wolfram Dietrich Zeuner, P. Weber, F. Palmonari, S. De Jong, M. Rosvick, G. A. Snow, C. P. Ward, S. G. Clowes, D. Hochman, B. Wilkens, M. Fierro, J. E.G. Edwards, S. W. Gensler, D. E. Plane, V. Gibson, H. Takeda, R. D. Heuer, D. L. Rees, W. Gorn, P. Mättig, S. J. Hillier, R. Howard, G. M. Dallavalle, M. J. Oreglia, S. Söldner-Rembold, J. R. Carter, H. Przysiezniak, B. Stockhausen, Paul Kyberd, Claude Leroy, M. J. Losty, F. K. Loebinger, Shoji Asai, T. Kobayashi, Erez Etzion, F. G. Oakham, E. L. Barberio, E. do Couto e Silva, J. P. Pansart, Marco Cuffiani, J. E. Pilcher, O. C. Cooke, V. H. Winterer, David Robinson, G. N. Patrick, O. Runolfsson, Stefan Kluth, M. W. Redmond, Shlomit Tarem, C. Dallapiccola, S. L. Chu, J. D. Gillies, R. Giacomelli, R. Lahmann, D. C. Imrie, J. C. Clayton, A. Buijs, G. W. Wilson, M. Hauschild, D. M. Strom, C. Stegmann, James Pinfold, N. I. Geddes, C. J. Oram, Eduardo Ros, Shlomo Dado, J.A. Lauber, G. P. Siroli, J. King, H. Fukui, T. Behnke, C. Markus, Reda Tafirout, Christoph Schwick, D. J. Miller, D. G. Fong, N. Capdevielle, J. von Krogh, R. G. Kellogg, J. Gascon, X. C. Lou, Stefano Marcellini, Daniel Lellouch, R. P. Middleton, N. J. Oldershaw, N. L. Rodning, D. Axen, Hans-Christian Schultz-Coulon, R.J. Akers, A. Jawahery, Gunter Wolf, Giora Mikenberg, Stephen Lloyd, Randall Sobie, G. A. Beck, L. A. del Pozo, M. Tecchio, Robert M Brown, C. Sbarra, Peter Sherwood, Achim Stahl, O. Schaile, J. W. Gary, D. S. Koetke, Alexander Wagner, J. Hagemann, Marcello Mannelli, J. E. Duboscq, Takehiko Mori, J. Ludwig, K. Runge, P. Bock, Michael Dittmar, Michael Schulz, G. Yekutieli, P. Teixeira-Dias, B. Poli, S. Wotton, A. A. Carter, M. Starks, Ron Folman, A. J. Martin, P. Utzat, M. G. Rison, B. Schmitt, T. W. Pritchard, V. Zacek, A. Yeaman, G. Duckeck, M. F. Turner-Watson, M. Morii, Peter R Hobson, I. J. Bloodworth, P. Routenburg, P. Szymanski, Paolo Giacomelli, M. Hansroul, M. Settles, Yoram Rozen, M. Foucher, C. H. Shepherd-Themistocleous, C. Jui, R. J. Homer, Stan Bentvelsen, Junichi Kanzaki, D. Karlen, C. Burgard, Matthias Schröder, H. Lafoux, N. K. Watson, W. Mohr, A. Posthaus, P. A. Elcombe, F. Scharf, U. Müller, W. Matthews, E. K. U. Gross, A. Gaidot, T. Wlodek, M. Sproston, T. Tsukamoto, N. Tesch, C. K. Hargrove, P. A. Hart, B. Nijjhar, and M. J. Pearce
Subjects: Nuclear physics, Physics, Decay time, Particle physics, Physics and Astronomy (miscellaneous), Meson, Electron–positron annihilation, Hadron, B meson, Elementary particle, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: Updated measurements of the B0 and B+ meson lifetimes are presented. From a data sample of 1.72 million hadronic Z0 decays recorded during the period 1991 to 1993, a sample of approximately 1000 semileptonic B meson decays containing a D0, D+ or D*+ has been isolated. From the distribution of decay times in the different samples the lifetimes of the B0 and B+ mesons are determined to be 1.53±0.12±0.08 ps and 1.52±0.14±0.09 ps, respectively, where the first error is statistical and the second systematic. The ratio of the B+ to B0 lifetimes is measured to be 0.99±0.14−0.04+0.05, confirming expectations that the lifetimes are similar.

44. SEARCH FOR NEUTRAL HIGGS BOSONS IN THE MINIMAL SUPERSYMMETRIC EXTENSION OF THE STANDARD MODEL

Author: Antonio Rossi, P. Bright-Thomas, J. J. Ward, T. Hilse, O. Runolfsson, C. Beeston, H. Przysiezniak, S. G. Clowes, M. Fierro, Claudio Grandi, S. L. Chu, Andris Skuja, Claire Shepherd-Themistocleous, G. D. Long, Tetsuro Mashimo, O. Ganel, P. Igo-Kemenes, G. Beaudoin, W. Gorn, H. Jeremie, R. E. Hughes-Jones, U. Maur, R. Mir, J. Steuerer, R. Lahmann, A. Höcker, P. Scharff-Hansen, B. Stockhausen, Paul Kyberd, F. K. Loebinger, D. C. Imrie, Shlomo Dado, J. Lauber, E. do Couto e Silva, A. M. Smith, H. Takeda, J. King, G. Vasseur, B. Lorazo, F. G. Oakham, Christoph Schwick, H. Mes, E. L. Barberio, Otmar Biebel, James Pinfold, I. P. Duerdoth, Marco Cuffiani, D. G. Charlton, D. L. Wagner, D. G. Fong, Giora Mikenberg, J. Gascon, H. von der Schmitt, Tohru Takeshita, Kiyotomo Kawagoe, H. Deng, R. Humbert, P. Gagnon, Richard G Kellogg, D. Rigby, R. J. Hemingway, Tara Shears, Georges Azuelos, S. Braibant, J. W. Gary, R. Giacomelli, Madjid Boutemeur, Marcello Mannelli, J. E. Duboscq, R. Ströhmer, Barry King, H. M. Fischer, P. Le Du, B. Fabbro, B. W. Kennedy, P. Weber, P. A. Hart, Norbert Wermes, Sherry Towers, P. S. Wells, G. Giacomelli, P. Jovanovic, G. T. Zorn, Austin Ball, T. Kawamoto, Gideon Bella, A. Michelini, P. G. Estabrooks, S. Orito, J. C. Hill, H. J. Burckhart, Jacqueline Batley, Terry Richard Wyatt, Peter Krieger, M. J. Pearce, Misao Sasaki, G. A. Snow, C. P. Ward, M. Rosvick, D. L. Rees, E. Lefebvre, B. C. Shen, H. M. Bosch, Wolfram Dietrich Zeuner, Manuella Vincter, Alessandro Montanari, M. Coupland, F. Odorici, Siegfried Bethke, P. M. Watkins, A. K. Honma, B. Nijjhar, J. Hart, C. Dallapiccola, N. K. Watson, S. A. Robins, W. G. Scott, T. Kobayashi, Xinchou Lou, J. D. Gillies, M. J. Oreglia, R. Kowalewski, John Allison, D. Axen, Richard Keeler, R. Bartoldus, A. Astbury, Silvia Arcelli, Gunter Wolf, F. X. Gentit, H. O. Ogren, M. Fanti, U. Müller, Peter Sherwood, R. Howard, M. J. Losty, A. J. Martin, Gaetano-Marco Dallavalle, J. R. Carter, G. N. Patrick, R. J. Barlow, D. J. Miller, R. W. Springer, Alexander Wagner, R.J. Akers, Ken W Bell, Claude Leroy, Christoph Geich-Gimbel, J. Hagemann, J. Ludwig, Stephen Lloyd, K. Runge, P. Bock, M. Tecchio, Robert M Brown, S. Wotton, N. I. Geddes, Gian Piero Siroli, R. D. Heuer, Fabrizio Fabbri, Ehud Duchovni, D. Van den plas, C. K. Hargrove, A. Buijs, D. M. Strom, Matthias Schröder, C. Stegmann, J. M. Roney, P. Szymanski, B. Poli, H. Fukui, D. R. Rust, W. Mohr, D. A. Hinshaw, O. Schaile, J. Goldberg, B. Nellen, A. Jawahery, D. E. Plane, P. Leblanc, P. Bentkowski, M. Jimack, H. Ihssen, D. S. Koetke, A. M. Lee, A. Posthaus, Stefano Marcellini, H. G. Evans, M. J. Goodrick, C. Jui, I. Cohen, S. W. Gensler, S. J. Hillier, Stan Bentvelsen, Erez Etzion, James Letts, Stefan Kluth, Shlomit Tarem, P. A. Elcombe, R. Van Kooten, D. Pitman, S. Rossberg, Alan Watson, C. J. Oram, J. E. Conboy, A. Fürtjes, M. H. Lehto, R. P. Middleton, T. Behnke, D. M. Gingrich, P. Berlich, Z. Li, W. R. Gibson, Gregor Herten, A. Beck, E. Heflin, B. Wilkens, J. Mildenberger, Harold Nguyen, Lorne Levinson, V. H. Winterer, I. J. Bloodworth, P. D. Phillips, Gordon H. Hanson, J. P. Pansart, F. S. Merritt, J. Becker, J. E. Pilcher, M. Settles, M. F. Turner-Watson, F. Scharf, M. Morii, Peter R Hobson, Yoram Rozen, Hans-Christian Schultz-Coulon, M. Hauschild, Randall Sobie, E. Torrente, Michael Schulz, G. D. Lafferty, C. Markus, M. Foucher, A. D. Schaile, Gideon Alexander, P. Routenburg, T. W. Pritchard, M. W. Redmond, Paolo Capiluppi, G. W. Wilson, Sachio Komamiya, D. Karlen, Theodoros Geralis, E. Ros, A. Skillman, Guenter Duckeck, M. A. Thomson, C. Burgard, E. K. U. Gross, J. A. McKenna, T. Wlodek, T. P. Kokott, A. Luig, M. Sproston, C. Darling, T. J. Smith, T. Tsukamoto, P. Mättig, Shoji Asai, N. Tesch, C. M. Hawkes, Daniel Lellouch, Takehiko Mori, J. R. McNab, A. Yeaman, P. D. Grannis, D. Hochman, K. Stephens, J. R. McNutt, V. Gibson, D. R. Ward, J. C. Clayton, Paolo Giacomelli, M. Hansroul, P. E.L. Clarke, R. J. Homer, U. C. Dunwoody, M. K. Jones, J. P. Martin, S. De Jong, C. Moisan, G. A. Beck, Achim Stahl, P. Teixeira-Dias, F. Liu, B. Schmitt, S. W. O'Neale, K. J. Anderson, P. Schenk, J. von Krogh, Margret Fincke-Keeler, C. Y. Chang, Dave Robinson, M. S. Dixit, Frans Meijers, T. J. McMahon, Michael Kobel, J. Schwiening, R. K. Carnegie, J. A. Wilson, H. Lafoux, J. G. Layter, C. Charlesworth, P. Poffenberger, C. Sbarra, Peter Fischer, P. Schütz, P. Pfister, Michael Dittmar, G. Yekutieli, A. Gaidot, A. A. Carter, Ron Folman, Roger Jones, M. G. Rison, M. Yurko, and P. W. Jeffreys
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), High Energy Physics::Phenomenology, Elementary particle, Context (language use), Parameter space, Standard Model, symbols.namesake, symbols, Higgs boson, High Energy Physics::Experiment, Quantum field theory, Engineering (miscellaneous), Higgs mechanism, Particle Physics - Experiment, Boson
Abstract: A search for the neutral Higgs bosons h0 and A0, predicted by the Minimal Supersymmetric Extension of the Standard Model (MSSM), has been performed by the OPAL Collaboration at LEP. The analysis was based on approximately 75 pb−1 of data taken at centre-of-mass energies in the vicinity of the Z0 resonance. No Higgs boson signals have been detected. Using, in addition, an upper limit on the contribution of non-Standard Model processes to the Z0 boson width, almost the entire MSSM parameter space that can be reached at present LEP energies has been excluded. In particular, at the 95% confidence level, our results imply that$m_{h^0 } > 44.5$ GeV/c2 and$m_{A^0 } > 24.3$ GeV/c2, for tan β≥1. The sensitivity to this assumption is discussed and the search results are also interpreted in the context of general two-doublet models.

45. MEASUREMENT OF THE LONGITUDINAL, TRANSVERSE AND ASYMMETRY FRAGMENTATION FUNCTIONS AT LEP

Author: D. R. Ward, T. Kress, Frank Fiedler, D. Hochman, R. Van Kooten, J. C. Clayton, Tara Shears, R. Bartoldus, R. Mir, J. Steuerer, U. C. Dunwoody, W. Matthews, Otmar Biebel, P. A. Hart, D. L. Wagner, B. Nijjhar, M. J. Pearce, I. J. Bloodworth, C.J. Beeston, M. A. Thomson, A. Gaidot, Gideon Bella, E. Lefebvre, T. Wlodek, B. Stockhausen, Paul Kyberd, F. K. Loebinger, S. W. O'Neale, J. Lauber, K. J. Anderson, H. Deng, Margret Fincke-Keeler, F. Wäckerle, M. Sproston, W. R. Gibson, F. Odorici, H. O. Ogren, Christoph Geich-Gimbel, D. Axen, H. J. Burckhart, R. W. Springer, Eilam Gross, Andris Skuja, A. I. McNab, J. Goldberg, D. M. Gingrich, R. Lahmann, N. J. Oldershaw, C. Sbarra, R.J. Akers, M. Settles, P. Poffenberger, Yoram Rozen, J. Letts, F. G. Oakham, Jacqueline Batley, D. C. Imrie, T. Tsukamoto, P. Igo-Kemenes, N. Tesch, R. Giacomelli, Matthias Schröder, Norbert Wermes, Sherry Towers, P. Schütz, E. L. Barberio, T. Kawamoto, B. Nellen, M. Foucher, P. Berlich, A. Buijs, D. M. Strom, C. Stegmann, G. D. Long, A. Beck, F. X. Gentit, H. Jeremie, T. Hilse, R. E. Hughes-Jones, A. Jawahery, O. Schaile, J. E. Conboy, Peter Sherwood, Sachio Komamiya, D. E. Hutchcroft, A. Fürtjes, Theodoros Geralis, E. Ros, S. Orito, D. R. Rust, Tetsuro Mashimo, K. Ametewee, H. Mes, M. Rosvick, C. Dallapiccola, Junichi Kanzaki, Georges Azuelos, C. Y. Chang, O. Runolfsson, P. Fath, Alexander Wagner, G. P. Siroli, J. D. Gillies, M. Hapke, Gideon Alexander, J. Ludwig, J. King, H. Fukui, Marco Cuffiani, D. Karlen, Paolo Capiluppi, C. Burgard, P. Taras, Lorne Levinson, V. Gibson, M. Starks, K. W. Bell, Michael Kobel, T. P. Kokott, A. J. Martin, A. M. Lee, N. Altekamp, F. S. Merritt, K. Runge, A. Luig, U. Müller, P. Bock, M. J. Oreglia, P. D. Phillips, E. von Törne, G. Yekutieli, E. do Couto e Silva, J. C. Hill, Julie Kirk, Misao Sasaki, H. Lafoux, N. I. Geddes, B. C. Shen, S. L. Chu, D. J. Miller, J. Bechtluft, C. Darling, T. J. Smith, Claudio Grandi, Siegfried Bethke, A. K. Honma, Dave Charlton, W. G. Scott, J. A. McKenna, W. Gorn, R. G. Kellogg, H. G. Evans, P. Mättig, R. Bürgin, B. Fabbro, Gilles Beaudoin, Paolo Giacomelli, M. Hansroul, Shoji Asai, M. Fanti, G. N. Patrick, G. Giacomelli, D. Rigby, R. J. Hemingway, C. M. Hawkes, Daniel Lellouch, R. Kowalewski, B. W. Kennedy, Stefano Marcellini, P. S. Wells, P. Jovanovic, Stephen Lloyd, Takehiko Mori, A. Skillman, N. L. Rodning, M. Tecchio, Robert M Brown, M. J. Losty, Sven Menke, C. K. Hargrove, M. J. Goodrick, V. Zacek, Ehud Duchovni, R. D. Heuer, B. Poli, C. H. Shepherd-Themistocleous, Fabrizio Fabbri, M. Jimack, I. Cohen, F. Palmonari, R. J. Homer, Gregor Herten, S. W. Gensler, C. Hartmann, D. E. Plane, T. Behnke, S. J. Hillier, P. Scharff-Hansen, T. R. Wyatt, Richard Keeler, H. M. Fischer, A. Joly, Kiyotomo Kawagoe, G. M. Dallavalle, B. Wilkens, A. Michelini, A. A. Carter, Ron Folman, R. J. Barlow, M. W. Redmond, P. Gagnon, G. A. Beck, Achim Stahl, P. Teixeira-Dias, R. Howard, I. P. Ducrdoth, J. Allison, J. P. Pansart, S. G. Clowes, A. M. Smith, Roger Jones, M. F. Turner-Watson, M. Morii, G. T. Zorn, M. Fierro, J. E.G. Edwards, G. Vasseur, Stefan Kluth, S. A. Robins, Alan Watson, H. M. Bosch, B. Lorazo, Shlomit Tarem, P. W. Jeffreys, Wolfram Dietrich Zeuner, Peter R Hobson, C. J. Oram, J. E. Pilcher, B. Schmitt, James Pinfold, D. G. Fong, P. Routenburg, J. Gascon, P. Bright-Thomas, J. R. Carter, A. Malik, J. W. Gary, D. S. Koetke, Marcello Mannelli, J. E. Duboscq, Gunter Wolf, P. Weber, J. J. Ward, P. Vikas, G. W. Wilson, M. Hauschild, Reda Tafirout, D. Lanske, S. Wotton, Shlomo Dado, C. Markus, B. J. King, Giora Mikenberg, P. Utzat, A. M. Rossi, S. Braibant, M. G. Rison, T. Kobayashi, O. C. Cooke, G. A. Snow, C. P. Ward, S. Söldner-Rembold, Hans-Christian Schultz-Coulon, Randall Sobie, Michael Schulz, T. W. Pritchard, Guenter Duckeck, J. von Krogh, S. B. Anderson, P. Szymanski, Stan Bentvelsen, R. J. Hawkings, L. A. del Pozo, T. J. McMahon, A. S. Turcot, J. Schwiening, R. K. Carnegie, J. A. Wilson, Madjid Boutemeur, P. G. Estabrooks, P. M. Watkins, Silvia Arcelli, E. A. Mckigney, W. P. Lai, Austin Ball, J. M. Roney, Peter Krieger, G. D. Lafferty, Manuella Vincter, Alessandro Montanari, P. E.L. Clarke, M. K. Jones, J. P. Martin, M. Tscheulin, S. De Jong, N. K. Watson, H. Przysiezniak, W. Mohr, A. Posthaus, G. G. Hanson, P. Schenk, D. L. Rees, M. S. Dixit, Frans Meijers, F. Scharf, J. G. Layter, A. D. Schaile, C. Charlesworth, and K. Stephens
Subjects: Physics, Quantum chromodynamics, Particle physics, Physics and Astronomy (miscellaneous), media_common.quotation_subject, High Energy Physics::Phenomenology, Hadron, Fragmentation (computing), Elementary particle, Multiplicity (mathematics), Asymmetry, Charged particle, Gluon, Nuclear physics, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment, media_common
Abstract: The fragmentation function for the process e+e−→h+X, whereh represents a hadron, may be decomposed into transverse, longitudinal and asymmetric contributions by analysis of the distribution of polar production angles. A number of new tests of QCD have been proposed using these fragmentation functions, but so far no data have been published on the separate components. We have performed such a separation using data on charged particles from hadronic Z0 decays atOpal, and have compared the results with the predictions of QCD. By integrating the fragmentation functions, we determine the average charged particle multiplicity to be$\overline {n_{ch} } = 21.05 \pm 0.20$. The longitudinal to total cross-section ratio is determined to be σL/σtot=0.057±0.005. From the longitudinal fragmentation function we are able to extract the gluon fragmentation function. The connection between the asymmetry fragmentation function and electroweak asymmetrics is discussed.

46. A STUDY OF B-MESON OSCILLATIONS USING DILEPTON EVENTS

Author: G. A. Beck, Achim Stahl, Tara Shears, P. Teixeira-Dias, P. A. Hart, C. M. Hawkes, Daniel Lellouch, B. Schmitt, S. G. Clowes, Takehiko Mori, M. Fierro, J. E.G. Edwards, M. J. Pearce, A. Buijs, V. Zacek, D. M. Strom, C. Stegmann, H. Fukui, D. Hochman, H. M. Fischer, James Pinfold, K. Stephens, B. Stockhausen, Paul Kyberd, F. K. Loebinger, T. Hilse, O. Runolfsson, A. Michelini, Margret Fincke-Keeler, C. Beeston, R. Van Kooten, Claudio Grandi, F. S. Merritt, D. G. Fong, Gregor Herten, B. Wilkens, Ehud Duchovni, P. S. Wells, J. P. Pansart, J. E. Pilcher, V. Gibson, J. Gascon, Kiyotomo Kawagoe, Terry Richard Wyatt, R. Giacomelli, D. Axen, I. J. Bloodworth, M. Jimack, M. Yurko, H. Mes, P. W. Jeffreys, G. W. Wilson, A. S. Turcot, M. Hauschild, Peter Sherwood, P. Igo-Kemenes, N. J. Oldershaw, Alexander Wagner, F. Palmonari, R.J. Akers, C. Markus, H. Jeremie, O. Schaile, M. Settles, Yoram Rozen, M. Starks, A. J. Martin, John Allison, J. Hagemann, J. Ludwig, Otmar Biebel, I. P. Duerdoth, D. R. Ward, P. Fath, T. Kress, M. Foucher, O. Tousignant, K. Runge, P. Bock, S. W. Gensler, Madjid Boutemeur, J. W. Gary, D. S. Koetke, R. E. Hughes-Jones, U. Maur, S. J. Hillier, Gideon Bella, Marcello Mannelli, J. E. Duboscq, J. A. McKenna, P. Bright-Thomas, D. L. Wagner, P. Gagnon, J. J. Ward, P. Vikas, Gunter Wolf, F. X. Gentit, S. A. Robins, Andris Skuja, Junichi Kanzaki, S. L. Chu, E. do Couto e Silva, H. J. Burckhart, Jacqueline Batley, D. Karlen, C. Burgard, V. H. Winterer, S. W. O'Neale, H. Deng, R. G. Kellogg, P. Weber, P. G. Estabrooks, K. J. Anderson, G. D. Long, D. M. Gingrich, J. C. Clayton, G. T. Zorn, Tetsuro Mashimo, U. Müller, R. Bartoldus, Richard Keeler, S. Braibant, H. M. Bosch, Stefano Marcellini, Wolfram Dietrich Zeuner, C. Darling, T. J. Smith, J. Letts, P. Berlich, H. O. Ogren, Christoph Geich-Gimbel, O. C. Cooke, S. Wotton, M. Fanti, Norbert Wermes, Sherry Towers, P. M. Watkins, P. Mättig, Shoji Asai, W. Gorn, C. Y. Chang, T. Kawamoto, R. Howard, Paolo Giacomelli, Claude Leroy, M. Hansroul, G. A. Snow, C. P. Ward, P. Taras, S. Orito, Stephen Lloyd, C. K. Hargrove, Matthias Schröder, Michael Kobel, Xinchou Lou, M. Tecchio, Robert M Brown, D. L. Rees, G. M. Dallavalle, J. E. Conboy, M. Rosvick, A. Fürtjes, S. Söldner-Rembold, E. Lefebvre, Silvia Arcelli, R. W. Springer, R. D. Heuer, Julie Kirk, T. Behnke, P. Scharff-Hansen, R. Lahmann, Fabrizio Fabbri, C. H. Shepherd-Themistocleous, D. C. Imrie, Erez Etzion, H. Lafoux, F. Odorici, M. W. Redmond, Tohru Takeshita, J. Steuerer, Stefan Kluth, Eilam Gross, Shlomit Tarem, D. E. Planc, Hans-Christian Schultz-Coulon, D. R. Rust, Randall Sobie, Michael Schulz, G. D. Lafferty, P. Poffenberger, R. J. Homer, Peter Fischer, N. Capdevielle, Shlomo Dado, J. von Krogh, Alan Watson, C. J. Oram, A. M. Smith, K. Ametewee, Dave Charlton, P. Schütz, Georges Azuelos, M. J. Oreglia, W. P. Lai, Gideon Alexander, G. Vasseur, Paolo Capiluppi, R. Bürgin, B. Fabbro, Barry King, B. Lorazo, T. W. Pritchard, A. M. Lee, A. Gaidot, W. R. Gibson, K. W. Bell, J. M. Roney, A. M. Rossi, R. P. Middleton, G. P. Siroli, J. King, G. Giacomelli, J. C. Hill, A. I. McNab, J. Goldberg, Marco Cuffiani, J. R. Carter, Misao Sasaki, B. Nellen, G. N. Patrick, Christoph Schwick, A. Beck, Giora Mikenberg, B. C. Shen, A. Jawahery, P. Leblanc, Guenter Duckeck, E. Heflin, Siegfried Bethke, A. K. Honma, Dave Robinson, B. Nijjhar, W. G. Scott, N. I. Geddes, Lorne Levinson, R. Kowalewski, P. D. Phillips, H. G. Evans, M. J. Goodrick, I. Cohen, Gilles Beaudoin, N. L. Rodning, M. J. Losty, A. Skillman, B. Poli, P. Szymanski, L. A. del Pozo, Reda Tafirout, C. Sbarra, C. Jui, Stan Bentvelsen, Michael Dittmar, G. Yekutieli, T. Kobayashi, A. A. Carter, Ron Folman, Roger Jones, P. Utzat, M. G. Rison, T. J. McMahon, J. Schwiening, R. K. Carnegie, J. A. Wilson, P. A. Elcombe, F. Scharf, A. D. Schaile, D. Rigby, R. J. Hemingway, B. W. Kennedy, P. Jovanovic, N. K. Watson, Austin Ball, Peter Krieger, W. Mohr, A. Posthaus, W. Matthews, Manuella Vincter, Alessandro Montanari, M. A. Thomson, T. Wlodek, M. Sproston, T. Tsukamoto, R. Mir, N. Tesch, J. Lauber, P. E.L. Clarke, U. C. Dunwoody, M. K. Jones, J. P. Martin, H. Takeda, M. Tscheulin, F. G. Oakham, S. De Jong, E. L. Barberio, A. Yeaman, C. Dallapiccola, J. D. Gillies, H. Przysiezniak, M. F. Turner-Watson, M. Morii, Peter R Hobson, P. Routenburg, R. J. Barlow, Sachio Komamiya, Theodoros Geralis, E. Ros, D. J. Miller, T. P. Kokott, A. Luig, J. G. Layter, C. Charlesworth, G. G. Hanson, P. Schenk, M. S. Dixit, and Frans Meijers
Subjects: Physics, Particle physics, Physics and Astronomy (miscellaneous), Electron–positron annihilation, High Energy Physics::Phenomenology, Hadron, Lower limit, Momentum, Nuclear physics, High Energy Physics::Experiment, B meson, Engineering (miscellaneous), Particle Physics - Experiment, Eigenvalues and eigenvectors, Lepton
Abstract: The time dependence of B meson oscillations is studied using hadronic Z0 decays with identified leptons in both thrust hemispheres. Decay times are reconstructed for each of the semileptonic B decays by forming vertices which include the lepton and by estimating the B meson momentum. The mass difference of the two mass eigenstates in the Bd0 system, Δmd, is measured to be$0.462_{ - 0.053 - 0.035}^{ + 0.040 + 0.052} ps^{ - 1}$, where the first error is statistical and the second systematic. For the Bs0 system, a lower limit of Δms>2.2 ps−1 at 95% C.L. is derived.

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