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Study of the fragmentation of $b$ quarks into $B$ mesons at the $Z$ peak

A. Heister S. Schael R. Barate 1 I. de Bonis 1 D. Decamp 1 C. Goy 1 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 P. Spagnolo 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 F. Podlyski 2 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 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 P. Laurelli G. Mannocchi F. Murtas G P. Murtas L. Passalacqua M. Pepealtarelli A Halley J G. Lynch P. Negus V. O'Shea C. Raine a S. Thompson S R. 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. Lujens 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 G. Sguazzoni R. Tenchini A. Venturi P G. Verdini G A. Blair G. Cowan M G. Green A. Misiejuk J A. Strong P. Teixeira-Dias J H. von Wimmersperg-Toller R W. Clifft T R. 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 : The fragmentation of b quarks into B mesons is studied with four million hadronic Z decays collected by the ALEPH experiment during the years 1991-1995. A semi-exclusive reconstruction of B->l nu D(*) decays is performed, by combining lepton candidates with fully reconstructed D(*) mesons while the neutrino energy is estimated from the missing energy of the event. The mean value of xewd, the energy of the weakly-decaying B meson normalised to the beam energy, is found to be mxewd = 0.716 +- 0.006 (stat) +- 0.006 \, (syst) using a model-independent method; the corresponding value for the energy of the leading B meson is mxel = 0.736 +- 0.006 (stat) +- 0.006 (syst). The reconstructed spectra are compared with different fragmentation models.
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Submitted on : Monday, July 23, 2001 - 11:19:03 AM
Last modification on : Tuesday, April 20, 2021 - 12:00:05 PM
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  • HAL Id : in2p3-00010978, version 1

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A. Heister, S. Schael, R. Barate, I. de Bonis, D. Decamp, et al.. Study of the fragmentation of $b$ quarks into $B$ mesons at the $Z$ peak. Physics Letters B, Elsevier, 2001, 512, pp.30-48. ⟨in2p3-00010978⟩

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