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Study of Charm Production in Z Decays

R. Barate 1 D. Decamp 1 P. Ghez 1 C. Goy 1 J P. Lees 1 E. Merle 1 M N. Minard 1 B. Pietrzyk 1 R. Alemany M P. Casado M. Chmeissani J M. Crespo E. Fernandez M. Fernandez-Bosman L. Garrido E. Grauges A. Juste M. Martinez G. Merino R. Miquel L M. Mir A. Pacheco I C. Park I. Riu 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 W. Zhao D. Abbaneo U. Becker G. Boix M. Cattaneo F. Cerutti V. Ciulli G. Dissertori H. Drevermann R W. Forty M. Frank T C. Greening a W. Halley J B. Hansen J. Harvey P. Janot B. Jost I. Lehraus O. Leroy P. Mato A. Minten A. Moutoussi F. Ranjard L. Rolandi D. Schlatter M. Schmitt O. Schneider P. Spagnolo W. Tejessy F. Teubert I R. Tomalin E. Tournefier a E. Wright Ziad Ajaltouni 2 F. Badaud 2 G. Chazelle 2 O. Deschamps 2 Alain Falvard 2 C. Ferdi 2 Pascal Gay 2 C. Guicheney 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 2 J D. Hansen J R. Hansen P H. Hansen B S. Nilsson B. Rensch A. Waananen G. Daskalakis A. Kyriakis C. Markou E. Simopoulou I. Siotis A. Vayaki 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 E. Focardi G. Parrini K. Zachariadou R. Cavanaugh M. Corden C. Georgiopoulos A. 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 L. Curtis J G. Lynch P. Negus V. O'Shea C. Raine P. Teixeira-Dias a S. Thompson O. Buchmuller S. Dhamotharan C. Geweniger G. Graefe 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 S. Goodsir E B. Martin N. Marinelli A. Sciaba J K. Sedgbeer E. Thomson M D. Williams V M. Ghete P. Girtler E. Kneringer D. Kuhn G. Rudolph C K. Bowdery P G. Buck a J. Finch F. Foster G. Hughes R W L. Jones N A. Robertson M I. Williams I. Giehl K. Jakobs K. Kleinknecht G. Quast B. Renk E. Rohne H G. Sander H. Wachsmuth C. Zeitnitz J.J. Aubert 4 C. Benchouk 4 A. Bonissent 4 J. Carr 4 P. Coyle 4 F. Etienne 4 F. Motsch 4 P. Payre 4 D. Rousseau 4 M. Talby 4 M. Thulasidas 4 M. Aleppo M. Antonelli F. Ragusa V. Buscher H. Dietl G. Ganis K. Huttmann G. Lutjens C. Mannert W. Manner H G. Moser S. Schael R. Settles H. Seywerd H. Stenzel W. Wiedenmann G. Wolf P. Azzurri 5 J. Boucrot 5 O. Callot 5 S. Chen 5 A. Cordier 5 M. Davier 5 L. Duflot J F. Grivaz P. Heusse A. Jacholkowska 5 F. Le Diberder 5 J. Lefrancois a M. Lutz 5 M H. Schune 5 J J. Veillet 5 I. Videau D. Zerwas 5 G. Bagliesi S. Bettarini T. Boccali C. Bozzi G. Calderini R. Dell'Orso I. Ferrante L. Foa A. Giassi A. Gregorio F. Ligabue A. Lusiani P S. Marrocchesi A. Messineo F. Palla G. Rizzo G. Sanguinetti G. Sguazzoni R. Tenchini C. Vannini A. Venturi P G. Verdini G A. Blair G. Cowan M G. Green T. Medcalf J A. Strong J H. von Wimmersperg-Toeller D R. Botterill R W. Clifft T R. Edgecock P R. Norton J C. Thompson 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 S N. Black J H. Dann R P. Johnson H Y. Kim N. Konstantinidis a M. Litke M A. Mcneil G. Taylor C N. Booth S. Cartwright F. Combley M S. Kelly M. Lehto L F. Thompson K. Affholderbach A. Bohrer S. Brandt C. Grupen J. Hess C. Koob A. Misiejuk G. Prange U. Sieler G. Giannini B. Gobbo J E. Rothberg S. Wasserbaech S R. Armstrong P. Elmer D P S. Ferguson Y. Gao S. Gonzalez O J. Hayes H. Hu S. Jin P A. Mcnamara J. Nielsen W. Orejudos y B. Pan Y. Saadi I J. Scott J. Walsh S L. Wu X. Wu G. Zobernig
Abstract : The production rates of D*+-, Ds*+-, D+-, D0 / D0bar, Ds+, and Lambda_c in Z to ccbar decays are measured using the LEP I data sample recorded by the ALEPH detector. The fractional energy spectrum of the D*+- is well described as the sum of three contributions: charm hadronisation, b hadron decays and gluon splitting into a pair of heavy quarks. The probability for a c quark to hadronise into a D*+ is found to be f(c to D*+) = 0.233 +- 0.010 (stat.) +- 0.011 (syst.). The average fraction of the beam energy carried by D*+- mesons in Z to cc events is measured to be X_E (D*+-) _cc = 0.4878 +- 0.0046 (stat.) +- 0.0061 (syst.). The D*+- energy and the hemisphere mass imbalance distributions are simultaneously used to measure the fraction of hadronic Z decays in which a gluon splits to a cc pair: n_{gluon to cc} = (3.23 +- 0.48 (stat.) +- 0.53 (syst.) %. The ratio of the Vector/(Vector+Pseudoscalar) production rates in charmed mesons is found to be P_V = 0.595 +- 0.045. The fractional decay width of the Z into cc pairs is determined from the sum of the production rates for various weakly decaying charmed states to be Rc = 0.1738 +- 0.0047 (stat.) +- 0.0116 (syst.).
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R. Barate, D. Decamp, P. Ghez, C. Goy, J P. Lees, et al.. Study of Charm Production in Z Decays. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2000, 16, pp.597-611. ⟨in2p3-00005198⟩

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