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Inclusive semileptonic branching ratios of b hadrons produced in Z decays

A. Heister S. Schael R. Barate 1 I. de Bonis 1 D. Decamp 1 C. Goy J P. Lees 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 S. Bravo M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido E. Grauges 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 Jiali Lin Q. Ouyang T. Wang Y. Xie R. Xu S. Xue J. Zhang L. Zhang D. Abbaneo P. Azzurri G. Boix O. Buchmuller 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 Ziad Ajaltouni 2 F. Badaud 2 Alain Falvard 2 Pascal Gay 2 Pierre Henrard 2 J. Jousset 2 B. Michel 2 S. Monteil 2 Jean-Claude Montret 2 D. Pallin 2 Pascal Perret 2 F. Podlyski J D. Hansen J R. Hansen P H. Hansen B S. Nilsson A. Waananen A. Kyriakis C. Markou E. Simopoulou A. Vayaki K. Zachariadou A. Blondel 3 G. Bonneaud 3 J C. Brient 3 A. Rouge 3 M. Rumpf 3 M. Swynghedauw 3 M. Verderi 3 H. Videau 3 V. Ciulli E. Focardi G. Parrini A. Antonelli M. Antonelli G. Bencivenni G. Bologna F. Bossi P. Campana G. Capon V. Chiarella G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepe-Altarelli P. Spagnolo 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 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 4 J. Carr 4 P. Coyle 4 O. Leroy 4 P. Payre 4 D. Rousseau 4 M. Talby 4 M. Aleppo F. Ragusa A. David H. Dietl G. Ganis K. Huttmann G. Lutjens C. Mannert W. Manner H G. Moser R. Settles H. Stenzel W. Wiedenmann G. Wolf J. Boucrot 5 O. Callot 5 M. Davier 5 L. Duflot 5 J F. Grivaz 5 P. Heusse 5 A. Jacholkowska 5 J. Lefrancois 5 J J. Veillet 5 I. Videau 5 C. Yuan 5 G. Bagliesi T. Boccali L. Foa A. Giammanco A. Giassi F. Ligabue A. Messineo F. Palla G. Sanguinetti A. Sciaba 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-Toller R W. Clifft T Edgecock P R. Norton I R. Tomalin B. Bloch-Devaux P. Colas S. Emery W. Kozanecki E. Lancon 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 H. Lehto L F. Thompson K. Affholderbach A. Bohrer S. Brandt C. Grupen A. Ngac G. Prange U. Sieler G. Giannini J E. Rothberg S R. Armstrong K. Cranmer P. Elmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin J. Kile J. Nielsen W. Orejudos y B. Pan Y. Saadi I J. Scott J. Walsh S L. Wu X. Wu G. Zobernig
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 $\bl$ and cascade $\bcl$ dec ays 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->l) = 0.1070 +- 0.0010 +- 0.0023 +- 0.0026 BR(b->c->l) = 0.0818 +- 0.0015 +- 0.0022 + 0.0022 -0.0014
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Submitted on : Friday, February 22, 2002 - 4:31:29 PM
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A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, et al.. Inclusive semileptonic branching ratios of b hadrons produced in Z decays. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2002, 22, pp.613-626. ⟨in2p3-00010989⟩

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