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

G. Alexander, John Allison, N. Altekamp, K. Ametewee, K. J. Anderson, S. Anderson, S. Arcelli, S. Asai, D. Axen, G. Azuelos, A. H. Ball, E. Barberio, Roger J. Barlow, R. Bartoldus, J. R. Batley, G. Beaudoin, J. Bechtluft, G. A. Beck, C. Beeston, T. BehnkeA. N. Bell, Kenneth Watson Bell, G. Bella, S. Bentvelsen, P. Berlich, S. Bethke, O. Biebel, I. J. Bloodworth, J. E. Bloomer, P. Bock, H. M. Bosch, M. Boutemeur, B. T. Bouwens, S. Braibant, P. Bright-Thomas, Robert M. Brown, H. J. Burckhart, C. Burgard, R. Burgin, P. Capiluppi, R. K. Carnegie, A. A. Carter, J. R. Carter, C. Y. Chang, C. Charlesworth, David G. Charlton, D. Chrisman, S. L. Chu, P. E.L. Clarke, S. G. Clowes, I. Cohen, J. E. Conboy, O. C. Cooke, M. Cuffiani, S. Dado, C. Dallapiccola, G. Marco Dallavalle, C. Darling, S. De Jong, L. A. del Pozo, M. S. Dixit, E. do Couto e Silva, E. Duchovni, G. Duckeck, I. P. Duerdoth, U. C. Dunwoody, J. E.G. Edwards, P. G. Estabrooks, H. G. Evans, F. Fabbri, B. Fabbro, P. Fath, F. Fiedler, M. Fierro, M. Fincke-Keeler, H. M. Fischer, R. Folman, D. G. Fong, M. Foucher, H. Fukui, A. Furtjes, P. Gagnon, A. Gaidot, J. W. Gary, J. Gascon, S. M. Gascon-Shotkin, N. I. Geddes, C. Geich-Gimbel, S. W. Gensler, F. X. Gentit, T. Geralis, G. Giacomelli, P. Giacomelli, R. Giacomelli, V. Gibson, W. R. Gibson, D. M. Gingrich, J. Goldberg, M. J. Goodrick, W. Gorn, C. Grandi, E. Gross, C. Hajdu, G. G. Hanson, M. Hansroul, M. Hapke, C. K. Hargrove, P. A. Hart, C. Hartmann, M. Hauschild, C. M. Hawkes, R. Hawkings, R. J. Hemingway, G. Herten, R. D. Heuer, M. D. Hildreth, J. C. Hill, S. J. Hillier, T. Hilse, P. R. Hobson, D. Hochman, R. J. Homer, A. K. Honma, D. Horvath, R. Howard, R. E. Hughes-Jones, D. E. Hutchcroft, P. Igo-Kemenes, D. C. Imrie, A. Jawahery, P. W. Jeffreys, H. Jeremie, M. Jimack, A. Joly, M. Jones, R. W.L. Jones, U. Jost, P. Jovanovic, D. Karlen, T. Kawamoto, R. K. Keeler, R. G. Kellogg, B. W. Kennedy, B. J. King, J. King, J. Kirk, S. Kluth, T. Kobayashi, M. Kobel, D. S. Koetke, T. P. Kokott, Sachio Komamiya, Robert V. Kowalewski, T. Kress, P. Krieger, J. von Krogh, P. Kyberd, G. D. Lafferty, H. Lafoux, R. Lahmann, W. P. Lai, D. Lanske, J. Lauber, J. G. Layter, A. M. Lee, E. Lefebvre, D. Lellouch, J. Letts, L. Levinson, C. Lewis, S. L. Lloyd, F. K. Loebinger, G. D. Long, B. Lorazo, M. J. Losty, J. Ludwig, A. Luig, A. Malik, M. Mannelli, S. Marcellini, C. Markus, A. J. Martin, J. P. Martin, G. Martinez, T. Mashimo, W. Matthews, Peter Mattig, W. John McDonald, J. McKenna, E. A. Mckigney, T. J. McMahon, A. I. McNab, F. Meijers, S. Menke, F. S. Merritt, H. Mes, J. Meyer, A. Michelini, G. Mikenberg, D. J. Miller, R. Mir, W. Mohr, A. Montanari, T. Mori, M. Morii, U. Muller, B. Nellen, B. Nijjhar, R. Nisius, S. W. O'Neale, F. G. Oakham, F. Odorici, H. O. Ogren, N. J. Oldershaw, T. Omori, C. J. Oram, M. J. Oreglia, S. Orito, M. Palazzo, J. Palinkas, F. M. Palmonari, J. P. Pansart, G. Pasztor, J. R. Pater, G. N. Patrick, M. J. Pearce, P. D. Phillips, J. E. Pilcher, J. Pinfold, David E. Plane, P. Poffenberger, B. Poli, A. Posthaus, T. W. Pritchard, H. Przysiezniak, D. L. Rees, D. Rigby, M. G. Rison, S. A. Robins, N. Rodning, J. M. Roney, E. Ros, A. M. Rossi, M. Rosvick, P. Routenburg, Y. Rozen, K. Runge, O. Runolfsson, D. R. Rust, R. Rylko, E. K.G. Sarkisian, M. Sasaki, C. Sbarra, A. D. Schaile, O. Schaile, F. Scharf, P. Scharff-Hansen, P. Schenk, B. Schmitt, Matthias Schroder, H. C. Schultz-Coulon, M. Schulz, P. Schutz, J. Schwiening, W. G. Scott, T. G. Shears, B. C. Shen, C. H. Shepherd-Themistocleous, P. Sherwood, G. P. Siroli, A. Sittler, A. Skillman, A. Skuja, A. M. Smith, T. J. Smith, G. A. Snow, R. Sobie, S. Soldner-Rembold, Robert Wayne Springer, M. Sproston, A. Stahl, M. Starks, C. Stegmann, K. Stephens, J. Steuerer, B. Stockhausen, David M. Strom, F. Strumia, P. Szymanski, R. Tafirout, H. Takeda, P. Taras, S. Tarem, M. Tecchio, N. Tesch, M. A. Thomson, E. von Torne, S. Towers, M. Tscheulin, T. Tsukamoto, E. Tsur, A. S. Turcot, M. F. Turner-Watson, P. Utzat, Rick J. Van Kooten, G. Vasseur, P. Vikas, M. Vincter, E. H. Vokurka, F. Wackerle, A. Wagner, D. L. Wagner, C. P. Ward, D. R. Ward, J. J. Ward, P. M. Watkins, A. T. Watson, N. K. Watson, P. Weber, P. S. Wells, N. Wermes, B. Wilkens, G. W. Wilson, J. A. Wilson, T. Wlodek, G. Wolf, S. Wotton, T. R. Wyatt, S. Xella, S. Yamashita, G. Yekutieli, V. Zacek

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Abstract

A measurement of the forward-backward asymmetries of e + e - →Z 0 →bb and e + e - ->Z°→cc̄ using electrons and muons produced in semileptonic decays of bottom and charm hadrons is presented. Two new variables designed to optimize flavour separation are used in a maximum likelihood fit to a sample of events containing one or two identified leptons, allowing the simultaneous extraction of the b and c quark forward-backward asymmetries as well as the average B°-B° mixing. Using all data collected by OPAL up to the end of 1994, the asymmetries are measured to be: A FB b = ( 5.5±2.4 ±0.3 )% A FB b = (-7.5±3.4 ±0.6 )% at (√s) = 89.52 GeV, A FB b = (9.06±0.51±0.23)% A FB b = ( 6.00±0.67±0.52)7c at (√s) = 91.24 GeV, A FB b =(11.7±2.0 ±0.3 )% A FB b =( 14.l±2.8 ±0.9 )% at (√s) = 92.94 GeV. For the average B°-B° mixing a value of: X = 0.1107 ±0.0062 ±0.0055, is obtained, where in each case the first error is statistical and the second systematic.

Original languageEnglish
Pages (from-to)357-369
Number of pages13
JournalZeitschrift fur Physik C-Particles and Fields
Volume70
Issue number3
DOIs
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)

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    Alexander, G., Allison, J., Altekamp, N., Ametewee, K., Anderson, K. J., Anderson, S., Arcelli, S., Asai, S., Axen, D., Azuelos, G., Ball, A. H., Barberio, E., Barlow, R. J., Bartoldus, R., Batley, J. R., Beaudoin, G., Bechtluft, J., Beck, G. A., Beeston, C., ... Zacek, V. (1996). Measurement of heavy quark forward-backward asymmetries and average B mixing using leptons in multihadronic events. Zeitschrift fur Physik C-Particles and Fields, 70(3), 357-369. https://doi.org/10.1007/s002880050114