A measurement of the gluon splitting rate into [formula omitted] pairs in hadronic Z decays

R Barate,A Gregorio,P Perret,A Putzer,B Jost,P Perrodo,G Musolino,M Carpinelli,A Roussarie,A Minten,S.R Armstrong,A Höcker,M Corden,F Ruggieri,E Rohne,C Vannini,A Sadouki,G Boix,A Lusiani,M.-N Minard,C Bozzi,R Hagelberg,M Davier,K Tittel,H Dietl,F Foster,R Xu,T.C Greening,J Sommer,M Aleppo,Ll Garrido,H Seywerd,F Motsch,E Tournefier,O.J Hayes,C Mannert,B Renk,E Merle,W Kozanecki,G.A Blair,F Teubert,C Guicheney,K Affholderbach,A Ranieri,D Buskulic,C Hoffmann,H Wachsmuth,W Cameron,G Lütjens,S Dhamotharan,G Merino,C Ferdi,A Blondel,F Bossi,S Schael,A Böhrer,B Michel,G Giannini,A Valassi,F Forti,G Graefe,D Schlatter,G Rudolph,G Bujosa,S Emery,P Bourdon,J Rothberg,R Beuselinck,M Chmeissani,P Tempesta,G Calderini,S Xue,F Le Diberder,G Bologna,B Gobbo,E Simopoulou,P Van Gemmeren,H Drevermann,F Podlyski,K Trabelsi,C Benchouk,P Henrard,R Fantechi,A Vayaki,C Markou,M Pepe-Altarelli,G Capon,G Chazelle,J.G Lynch,J.H Dann,M De Palma,O Schneider,G Mannocchi,G Batignani,P Payre,Q Ouyang,T Medcalf,B.S Nilsson,S Goodsir,B Pietrzyk,F Etienne,P Campana,J Jousset,M Wunsch,G Sanguinetti,K Zachariadou,B Bloch-Devaux,A Rougé,G Felici,J Schwindling,P Colas,W Tejessy,F Ranjard,M Rumpf,O Callot,G Hughes,P Girtler,I Siotis,R Settles,I Giehl,G Crawford,S Monteil,E Thomson,S Bettarini,R Alemany,I Ferrante,A Moutoussi,A Pacheco,I Videau,I Lehraus,C Georgiopoulos,W Orejudos,J Boucrot,S Jin,F Murtas,R Berlich,M Thulasidas,B Vallage,L Passalacqua,W Männer,V Hepp,C Zeitnitz,S Werner,M Verderi,A Antonelli,G Bencivenni,G Gelao,A Wäänänen,M Delfino,G Hansper,H Videau,P Colrain,Y Saadi,E Charles,F Badaud,G Parrini,P.G Buck,P Coyle,B Rensch,U Becker,G Rizzo,C Geweniger,F Combley,J Lefrançois,A Cordier,A Trabelsi,E Locci ,P Hanke ,F Ragusa ,J D Hansen ,E.-E Kluge ,T Boccali ,A.w Halley ,L Smolík ,A Tricomi ,M G Green ,M Girone ,D W Kim ,J C Brient ,R W Clifft ,E Lançon ,V Ciulli ,F Ligabue ,A Falvard ,D Rousseau ,P Mató ,P Negus ,L Silvestris ,F J Munoz Sanchez ,M.s Kelly ,G Mäggi ,J C Montret ,A M Litke ,M Maggi ,J.t Chambers ,D.p.s Ferguson ,C Goy ,J J Veillet ,M Lehto ,E Graugés ,T.r Edgecock ,S L Wu ,L Zhang ,A Sciabà ,G Daskalakis ,G Dissertori ,M H Schune ,J Nielsen ,D Décamp ,A M Lutz ,L Moneta ,D Kühn ,D Abbaneo ,G Rolandi ,S Nuzzo ,Z Ajaltouni ,A Giassi ,P S Marrocchesi ,P Spagnolo ,D Botterill ,Y Pan ,R Forty ,V Chiarella ,P G Verdini ,L Foà ,J Rander ,P R Norton ,J M Nachtman ,J.y Nief ,J M Scarr ,W Wiedenmann ,G Wolf ,J Guenther ,P Laurelli ,P Janot ,M Schmitt ,G Zito ,M Fernández-Bosman ,G Sguazzoni ,M C Lemaire ,J.m Crespo ,Y S Gao ,M A Ciocci ,M Cattaneo ,A Juste Rozas ,J Harvey ,L.f Thompson ,G N Taylor ,J Lin ,P Rosnet ,V Büscher ,Philippe Ghez ,J Walsh ,E Kneringer ,H Hu ,G Bagliesi ,V O’shea ,X T Huang ,G Ganis ,Á Pascual ,Siegmund Brandt ,A Jachołkowska ,P Teixeira-Dias ,L M Bryant ,J Nash ,J.j Aubert ,J A Strong ,M Frank ,F Cerutti ,N Konstantinidis ,K Kleinknecht ,F Stephan ,R Dell’orso ,D Zerwas ,I Scott ,L Duflot ,A Kyriakis ,A Messineo ,M P Casado ,P J Dornan ,M.i Williams ,G Quast ,S L Cartwright ,S Wasserbaech ,T Wang ,J Zhang ,S Chen ,H Stenzel ,C Raine ,G Iaselli ,Y Xie ,G Selvaggi ,E B Martin ,P Azzurri ,J P Lees ,X Wu ,M A Giorgi ,P H Hansen ,J F Renardy ,R.p Johnson ,G Tonelli ,M Antonelli ,K Jakobs ,N A Robertson ,O Buchmüller ,M Talby ,A Lucotte ,J.c Thompson ,M Martínez ,J Proriol ,I C Park ,P Pérez ,Pedro Saraiva ,P Elmer ,S.n Black ,J P Schuller ,G Cowan ,H G Sander ,P Heusse ,S González ,A P Betteridge ,I R Tomalin ,Р Тенчини ,P Bright-Thomas ,D M Binnie ,J Carr ,D Casper ,V M Ghete ,J H Von Wimmersperg-Toeller ,A Bonissent ,A.e Wright ,J B Hansen ,C N Booth ,O Deschamps ,N Marinelli ,M Williams ,M.a Mcneil ,L Curtis ,G R Bonneaud ,A Colaleo ,D Pallin ,O Leroy ,J K Sedgbeer ,D E Jaffe ,E Fernández ,A J Finch ,R W L Jones ,A Venturi ,L M Mir ,G Raso ,P.a Mcnamara ,H Y Kim ,R Miquel ,E Focardi ,F Palla ,W Zhao ,C K Bowdery ,D Creanza ,I Riu ,C Grupen ,K M Smith ,J.-F Grivaz ,A S Thompson ,G Zobernig

doi:10.1016/s0370-2693(98)00850-8

A measurement of the gluon splitting rate into [formula omitted] pairs in hadronic Z decays

R Barate, A Gregorio + Show 362 more

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https://doi.org/10.1016/s0370-2693(98)00850-8

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#Lifetime Tag #Four-jet Events + Show 1 more

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Abstract

A measurement of the fraction of hadronic Z decays in which a gluon splits into a b b ̄ pair, g b b ̄ , 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 g b b ̄ =(2.77±0.42 (stat)±0.57 (syst))×10 −3 .

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