A measurement of the gluon splitting rate into bb̄ pairs in hadronic Z decays
R. Barate,Damir Buskulic,D. Décamp,Ph Ghez,Corinne B. Goy,Jean Pierre Lees,Arnaud Lucotte,E. Merle,Marie Noelle Minard,Jean Yves Nief,Bolek Pietrzyk,Ricard Alemany,Gaëlle Boix,M. P. Casado,Mokhtar A. Chmeissani,José M. Crespo,Manuel C. Delfíno,Enrique Fernández,M. Fernandez-Bosman,Ll I. Garrido,Eugeni S. Graugés,Aurelio Juste,Mauricio C. Martínez, G. Merino,Ramon Miquel,Ll M. Mir, I. C. Park,Anna Pascual,Imma Riu,Federico A. Sánchez,Anna Colaleo,Donato Creanza,Mauro De Palma,G. Gelao,Giuseppe Iaselli,Giorgio Pietro Maggi,Marcello Maggi,Salvatore Nuzzo,Antonio Ranieri,Giuseppe Raso,Federico Ruggierí,G. Selvaggi,Lucia Silvestris,Piergiulio Tempesta, Alessia Tricomi,Giuseppe Zito,Xiuping Huáng,Jim Lin,Qun Ouyang,Taijie Wang,Yi Xie,Rui Xu,Shengtian Xue,Jian Zhang,Lei Zhang,Wei Zhao,Duccio Abbaneo,Ulrich J. Becker, P. G. Bright-Thomas,David W. Casper,Marco Cattaneo,Francesco Cerutti,V. Ciülli,Günther Dissertori,Hans Drevermann,Roger W. Forty, Markus J. Frank,R. Hagelberg,A. W. Halley,Jørgen Beck Hansen,Jeffrey A. Harvey,Patrick Janot,Beat Jost,I. Lehraus,Pere Mató, A. Minten,Lorenzo Moneta,Alberto J. Pacheco,Florence Ranjard,Luigi Rolandi,David Rousseau,Dieter Schlatter,Michael Schmitt,Olivier Schneider,W. Tejessy,Frederic Teubert,I. R. Tomalin,H. W. Wachsmuth,Zeina J. Ajaltouni,Frédérique Badaud,G. Chazelle,Olivier Deschamps,A. Falvard,Catherine Ferdi,Pascal Gay,C. J. Guicheney,Pierre Henrard,J. C. Jousset,B. Michel,Stéphane Monteil,J. C. Montret,Dominique Pallin,Pascal Perret, F. Podlyski,J. Proriol,Philippe Rosnet,Jakob Dines Hansen,John Renner Hansen,Philip H. Hansen,Björn S. Nilsson,B. Rensch,Anders Wäänänen,Georgios Daskalakis, A. Kyriakis,Christos T. Markou,E. Simopoulou,Ion Siotis,A. Vayaki,Alain P. Blondel,G. R. Bonne̊aud,Jean Claude Brient,P. Bourdon,André Rougé,M. Rumpf,Andrea Valassi,Marc Verderi,Henri Videau, Ettore Focardi,Giuliano Parrini,K. Zachariadou,M. J. Corden,C. H. Georgiopoulos,David E. Jaffe,Angelo Antonelli,Giorgio Bencivenni,G. F. Bologna,Fabio C. Bossi,Pierluigi L. Campana,G. Capon,Vitaliano Chiarella,Giuseppe Felici,P. Laurelli,G. P. Mannocchi,Fabrizio Murtas, G. P. Murtas,L. Passalacqua,M. Pepe Altarelli,Lorenzo J. Curtis,James G R Lynch,Peter J. Negus,Val O'Shea,Colin Raine,J. Michael Scarr,Kenway M. Smith,P. Teixeira-Dias,A. Stan Thompson,Evelyn J. Thomson,O. L. Büchmüller,S. Dhamotharan,Chr C. Geweniger,G. Graefe,Paul A. Hanke,G. Hansper,Volker Hepp, E. E. Kluge,Alois Putzer,J. Sommer,K. Tittel,Sebastian Werner, Martin Wunsch,R. Beuselinck,David M. Binnie,W. Cameron,PJ J. Dornan,Maria Girone,S. Goodsir,Ed B. Martin,Nancy Marinelli, A. Moutoussi,Jordan A. Nash,J. K. Sedgbeer,Paolo Spagnolo,Michael D. Williams, V. M. Ghete,P. Girtler,Emmerich Kneringer, D. Kuhn,Gerald Rudolph,A. P. Betteridge,Chris K. Bowdery,P. G. Buck,P. Colrain,Gregory A. Crawford,AJ J. Finch,F. Foster,G. D. Hughes,Roger W L Jones,N. A. Robertson,M. I. Williams,I. Giehl,Christian V. Hoffmann,Karl Heinz Jakobs,Konrad Kleinknècht,Günter Quast,Burkhard Renk,Eric Rohne,Heinz Georg Sander,Peter Van Gemmeren,Ch Zeitnitz,JJ J. Aubert,Chafik Benchouk,Alain Bonissent,G. Bujosa,John Austin Carr,Paschal A. Coyle,François Etienne,Olivier Leroy,F. Motsch,Patrice Payre,Mossadek Talby,A. Sadouki,M. Thulasidas,Karim Trabelsi,Mario Aleppo,Mario Antonelli,Francesco Ragusa,R. Berlich,Volker Büscher,Glen A. Cowan,Hans Dietl,Gerardo Ganis, G. Lütjens,C. Mannert,W. E. Männer,Hans Günther Moser,Stefan Schael,Ronald Dean Settles,Henry C J Seywerd,Hasko Stenzel, W. Wiedenmann,Günter K. Wolf,J. Boucrot,Olivier H. Callot,S. J. Chen,A. Cordier,Michel Davier,L. Duflot,Jean François Grivaz,Ph Heusse, Andreas Höcker,Agnieszka Jachołkowska,Dongwook Kim,Francois L. Le Diberder,Jaques Lefrançois,A. M. Lutz,Marie Hélène Schune,Edwige Tournefier,J. J. Veillet,Ioana Videau,Dirk Zerwas,Paolo Azzürri,Giuseppe Bagliesi,Giovanni Batignani,Stefano Bettarini,Tommaso Boccali,Concezio Bozzi,Giovanni Calderini,Massimo Carpinelli,M. A. Ciocci,R. Dell'Orso,Riccardo Fantechi,Isidoro Ferrante,Lorenzo Foà,Francesco Forti, A. Giassi,Marcello A. Giorgi,Anna Gregorio,F. Ligabue,Alberto Lusiani,PS S. Marrocchesi,Alberto Messineo,Fabrizio Palla,Giuliana A. Rizzo,Giulio Sanguinetti,Andrea Sciabà,Giacomo Sgüazzoni,Roberto Tenchini,Guido E. Tonelli,C. Vannini,Andrea Venturi,Piero Giorgio Verdini,Grahame A. Blair,L. M. Bryant,J. T. Chambers,Martin G. Green,T. Medcalf,Pascal Perrodo,John A. Strong,J. H. von Wimmersperg-Toeller,David R. Botterill, R. W. Clifft,T. R. Edgecock,PR R. Norton,James C. Thompson,Alison E. Wright,Brigitte Bloch-Devaux,Paul Colas,Sandrine Emery,W. Kozanecki,Eric Lançon,M. C. Lemaire, E. Locci,Patrice Rodríguez Pérez, J. Rander,Jean F. Renardy,A. Roussarie,J. P. Schüller,Jérôme Schwindling,Adel Trabelsi,Bertrand Vallage,S. N. Black,J. H. Dann,Robert P. Johnson,H. Y. Kim,Nikos Konstantinidis,Alan M. Litke,M. A. McNeil,Gary N. Taylor,C. N. Booth,Susan L. Cartwright,F. H. Combley,M. S. Kelly,Mark H. Lehto,Lee F. Thompson,K. Affholderbach,Armin Böhrer,Siegmund Brandt,Claus Grupen,P. Saraiva,Ludek Smolìk,F. Stephan,Gianrossano R. Giannini,Benigno Gobbo,G. Musolino,Joe E. Rothberg,Steven R. Wasserbaech,S. R. Armstrong,E. Charles,Peter Elmer,D. P S Ferguson,Yongsheng Gao,Sergio González,T. C. Greening,OJ J. Hayes,Hongbo Hu,Shi Jin,PA A. McNamara,Jane M. Nachtman,Jason Nielsen,W. Orejudos,Yi Pan,Y. Saadi,I. J. Scott,John J. Walsh,Saulan Wu,Xin Wu,Georg Zobernig
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics（1998）
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摘要
A measurement of the fraction of hadronic Z decays in which a gluon splits into a bb̄ pair, gbb̄, is presented using data collected by ALEPH from 1992 to 1995 at the Z resonance. The selection is based on four-jet events. Events are selected by means of topological cuts and a lifetime tag. The result is gbb̄ = (2.77 + 0.42(stat) + 0.57(syst)) × 10-3. © 1998 Elsevier Science B.V. All rights reserved.
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