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Inclusive semileptonic branching ratios of b hadrons produced in Z decays

  • A. Heister
  • , S. Schael
  • , R. Barate
  • , I. de Bonis
  • , D. Decamp
  • , C. Goy
  • , J. P. Lees
  • , E. Merle
  • , M. N. Minard
  • , B. Pietrzyk
  • , S. Bravo
  • , M. P. Casado
  • , M. Chmeissani
  • , J. M. Crespo
  • , E. Fernandez
  • , M. Fernandez-Bosman
  • , L. Garrido
  • , E. Graugés
  • , M. Martinez
  • , G. Merino
  • R. Miquel, L. M. Mir, A. Pacheco, H. Ruiz, A. Colaleo, D. Creanza, M. de Palma, G. Iaselli, G. Maggi, M. Maggi, S. Nuzzo, A. Ranieri, G. Raso, F. Ruggieri, G. Selvaggi, L. Silvestris, P. Tempesta, A. Tricomi, G. Zito, X. Huang, J. Lin, Q. Ouyang, T. Wang, Y. Xie, R. Xu, S. Xue, J. Zhang, L. Zhang, W. Zhao, D. Abbaneo, P. Azzurri, G. Boix, O. Buchmüller, M. Cattaneo, F. Cerutti, B. Clerbaux, G. Dissertori, H. Drevermann, R. W. Forty, M. Frank, T. C. Greening, J. B. Hansen, J. Harvey, P. Janot, B. Jost, M. Kado, P. Mato, A. Moutoussi, F. Ranjard, L. Rolandi, D. Schlatter, O. Schneider, W. Tejessy, F. Teubert, E. Tournefier, J. Ward, Z. Ajaltouni, F. Badaud, A. Falvard, P. Gay, P. Henrard, J. Jousset, B. Michel, S. Monteil, J. C. Montret, D. Pallin, P. Perret, F. Podlyski, J. D. Hansen, J. R. Hansen, P. H. Hansen, B. S. Nilsson, A. Wäänänen, A. Kyriakis, C. Markou, E. Simopoulou, A. Vayaki, K. Zachariadou, A. Blondel, G. Bonneaud, J. C. Brient, A. Rougé, M. Rumpf, M. Swynghedauw, M. Verderi, H. Videau, V. Ciulli, E. Focardi, G. Parrini, A. Antonelli, M. Antonelli, G. Bencivenni, G. Bologna, F. Bossi, P. Campana, G. Capon, V. Chiarella, P. Laurelli, G. Mannocchi, F. Murtas, G. P. Murtas, L. Passalacqua, M. Pepe-Altarelli, P. Spagnolo, A. W. Halley, J. G. Lynch, P. Negus, V. O'Shea, C. Raine, A. S. Thompson, S. Wasserbaech, R. Cavanaugh, S. Dhamotharan, C. Geweniger, P. Hanke, G. Hansper, V. Hepp, E. E. Kluge, A. Putzer, J. Sommer, K. Tittel, S. Werner, M. Wunsch, R. Beuselinck, D. M. Binnie, W. Cameron, P. J. Dornan, M. Girone, N. Marinelli, J. K. Sedgbeer, J. C. Thompson, V. M. Ghete, P. Girtler, E. Kneringer, D. Kuhn, G. Rudolph, E. Bouhova-Thacker, C. K. Bowdery, A. J. Finch, F. Foster, G. Hughes, R. W.L. Jones, M. R. Pearson, N. A. Robertson, I. Giehl, K. Jakobs, K. Kleinknecht, G. Quast, B. Renk, E. Rohne, H. G. Sander, H. Wachsmuth, C. Zeitnitz, A. Bonissent, J. Carr, P. Coyle, O. Leroy, P. Payre, D. Rousseau, M. Talby, M. Aleppo, F. Ragusa, A. David, H. Dietl, G. Ganis, K. Hüttmann, G. Lütjens, C. Mannert, W. Männer, H. G. Moser, R. Settles, H. Stenzel, W. Wiedenmann, G. Wolf, J. Boucrot, O. Callot, M. Davier, L. Duflot, J. F. Grivaz, Ph Heusse, A. Jacholkowska, J. Lefrançois, J. J. Veillet, I. Videau, C. Yuan, G. Bagliesi, T. Boccali, L. Foà, A. Giammanco, A. Giassi, F. Ligabue, A. Messineo, F. Palla, G. Sanguinetti, A. Sciabà, G. Sguazzoni, R. Tenchini, A. Venturi, P. G. Verdini, G. A. Blair, G. Cowan, M. G. Green, T. Medcalf, A. Misiejuk, J. A. Strong, P. Teixeira-Dias, J. H. von Wimmersperg-Toeller, R. W. Clifft, T. R. Edgecock, P. R. Norton, I. R. Tomalin, B. Bloch-Devaux, P. Colas, S. Emery, W. Kozanecki, E. Lançon, M. C. Lemaire, E. Locci, P. Perez, J. Rander, J. F. Renardy, A. Roussarie, J. P. Schuller, J. Schwindling, A. Trabelsi, B. Vallage, N. Konstantinidis, A. M. Litke, G. Taylor, C. N. Booth, S. Cartwright, F. Combley, M. Lehto, L. F. Thompson, K. Affholderbach, A. Böhrer, S. Brandt, C. Grupen, A. Ngac, G. Prange, U. Sieler, G. Giannini, J. Rothberg, S. R. Armstrong, K. Cranmer, P. Elmer, D. P.S. Ferguson, Y. Gao, S. González, O. J. Hayes, H. Hu, S. Jin, J. Kile, P. A. McNamara, J. Nielsen, W. Orejudos, Y. B. Pan, Y. Saadi, I. J. Scott, J. Walsh, Sau Lan Wu, X. Wu, G. Zobernig
  • RWTH Aachen University
  • Université Paris-Sud
  • University of São Paulo
  • University of Barcelona
  • Swissair Navigation Services
  • INFN Sezione di Bari
  • University of Palermo
  • INFN Sezione di Catania
  • Institute of High Energy Physics, Chinese Academy of Sciences
  • European Organization for Nuclear Research
  • Allied Signal Inc.
  • University of Lausanne
  • University of Rome “Tor Vergata”
  • Université Blaise Pascal
  • University of Montpellier (UMR MiVEGEC)
  • Niels Bohr Institutet
  • NCSR Demokritos
  • University of Geneva
  • University of Florence
  • LNF-INFN
  • Ev-K2-CNR Committee
  • Laboratoire de Physique Subatomique et de Cosmologie de Grenoble
  • University of Glasgow
  • Haverford College
  • University of Heidelberg
  • SAP AG
  • Imperial College London
  • CCLRC Rutherford Appleton Laboratory
  • University of Innsbruck
  • Lancaster University
  • Johannes Gutenberg University
  • Aix-Marseille Université
  • Sezione INFN di Milano
  • Max-Planck-Institut für Physik
  • Ernest Orlando Lawrence Berkeley National Laboratory
  • Laboratoire de l'Accélérateur Linéaire
  • Istituto Nazionale di Fisica Nucleare, Sezione di Pisa
  • Royal Holloway University of London
  • Rutherford Appleton Laboratory
  • CEA, Irfu, SPP
  • Campus Universitaire
  • University of California at Santa Cruz
  • The University of Sheffield
  • Universität Siegen
  • University of Trieste
  • University of Washington
  • University of Wisconsin-Madison
  • Tsinghua University

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

A measurement of the inclusive semileptonic branching ratios of b hadrons produced in Z decay is presented, using four million hadronic events collected by the ALEPH detector from 1991 to 1995. Electrons and muons are selected opposite to b-tagged hemispheres. Two different methods are explored to distinguish the contributions from direct b → Xlν and cascade b → c → Xlν decays to the total lepton yield. One is based on the lepton transverse momentum spectrum, the other makes use of the correlation between the charge of the lepton and charge estimators built from tracks in the opposite hemisphere of the event. The latter method reduces the dependence on the modelling of semileptonic b decays. The results obtained by averaging the two techniques are BR(b → Xlν) = 0.1070 ± 0.0010stat ± 0.0023syst ± 0.0026model , BR(b → c → Xlν) = 0.0818 ± 0.0015stat ± 0.0022syst -0.0014 model+0.0010.

Original languageEnglish
Pages (from-to)613-626
Number of pages14
JournalEuropean Physical Journal C
Volume22
Issue number4
DOIs
Publication statusPublished - 1 Jan 2001

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