Measurement Of The B-S(0) Lifetime And Production-Rate With D-S(-)L(+) Combinations In Z-Decays

D Buskulic,D Casper,I De Bonis,D Decamp,P Ghez,C Goy,J.-P Lees,A Lucotte,M.-N Minard,P Odier,B Pietrzyk,F Ariztizabal,M Chmeissani,J.M Crespo,I Efthymiopoulos,E Fernandez,M Fernandez-Bosman,V Gaitan,Ll Garrido,M Martinez,S Orteu,A Pacheco,C Padilla,F Palla,A Pascual,J.A Perlas,F Sanchez,F Teubert,A Colaleo,D Creanza,M de Palma,A Farilla,G Gelao,M Girone,G Iaselli,G Maggi,M Maggi,N Marinelli,S Natali,S Nuzzo,A Ranieri,G Raso,F Romano,F Ruggieri,G Selvaggi,L Silvestris,P Tempesta,G Zito,X Huang,J Lin,Q Ouyang,T Wang,Y Xie,R Xu,S Xue,J Zhang, L Zhang,W Zhao,G Bonvicini,M Cattaneo,P Comas,P Coyle,H Drevermann,A Engelhardt,R.W Forty,M Frank,R Hagelberg,J Harvey,R Jacobsen,P Janot,B Jost,J Knobloch,I Lehraus,C Markou,E.B Martin,P Mato,H Meinhard,A Minten,R Miquel,T Oest,P Palazzi,J.R Pater,J.-F Pusztaszeri,F Ranjard,P Rensing,L Rolandi,D Schlatter,M Schmelling,O Schneider,W Tejessy,I.R Tomalin,A Venturi,H Wachsmuth,W Wiedenmann,T Wildish,W Witzeling,J Wotschack,Z Ajaltouni,M Bardadin-Otwinowska,A Barres,C Boyer,A Falvard,P Gay,C Guicheney,P Henrard,J Jousset,B Michel,S Monteil,J-C Montret,D Pallin,P Perret,F Podlyski,J Proriol,J.-M Rossignol,F Saadi,T Fearnley,J.B Hansen,J.D Hansen,J.R Hansen,P.H Hansen,B.S Nilsson,A Kyriakis,E Simopoulou,I Siotis,A Vayaki,K Zachariadou,A Blondel,G Bonneaud,J.C Brient,P Bourdon,L Passalacqua,A Rougé,M Rumpf,R Tanaka,A Valassi,M Verderi,H Videau,D.J Candlin,M.I Parsons,E Focardi,G Parrini,M Corden,M Delfino,C Georgiopoulos,D.E Jaffe,A Antonelli,G Bencivenni,G Bologna,F Bossi,P Campana,G Capon,V Chiarella,G Felici,P Laurelli,G Mannocchi,F Murtas,G.P Murtas,M Pepe-Altarelli,S.J Dorris,A.W Halley,I ten Have,I.G Knowles,J.G Lynch,W.T Morton,V O'Shea,C Raine,P Reeves,J.M Scarr,K Smith,M.G Smith,A.S Thompson,F Thomson,S Thorn,R.M Turnbull,U Becker,O Braun,C Geweniger,G Graefe,P Hanke,V Hepp,E.E Kluge,A Putzer,B Rensch,M Schmidt,J Sommer,H Stenzel,K Tittel,S Werner,M Wunsch,R Beuselinck,D.M Binnie,W Cameron,D.J Colling,P.J Dornan,N Konstantinidis,L Moneta,A Moutoussi,J Nash,G San Martin,J.K Sedgbeer,A.M Stacey,G Dissertori,P Girler,E Kneringer,D Kuhn,G Rudolph,C.K Bowdery,T.J Brodbeck,P Colrain,G Crawford,A.J Finch,F Foster,G Hughes,T Sloan,E.P Whelan,M.I Williams,A Galla,A.M Greene,K Kleinknecht,G Quast,J Raab,B Renk,H.-G Sander,R Wanke,P van Gemmeren,C Zeitnitz,J.J Aubert,A.M Bencheikh,C Benchouk,A Bonissent,G Bujosa,D Calvet,J Carr,C Diaconu,F Etienne,M Thulasidas,D Nicod,P Payre,D Rousseau,M Talby,I Abt,R Assmann,C Bauer,W Blum,D Brown,H Dietl,F Dydak,G Ganis,C Gotzhein,K Jakobs,H Kroha,G Lütjens,G Lutz,W Männer,H.-G Moser,R Richter,A Rosado-Schlosser,S Schael,R Settles,H Seywerd,U Stierlin,R.St Denis,G Wolf,R Alemany,J Boucrot,O Callot,A Cordier,F Courault,M Davier,L Duflot,J.-F Grivaz,Ph Heusse,M Jacquet,D.W Kim,F Le Diberder,J Lefrançois,A.-M Lutz,G Musolino,I Nikolic,H.J Park,I.C Park,M.-H Schune,S Simion,J.-J Veillet,I Videau,D Abbaneo,P Azzurri,G Bagliesi,G Batignani,S Bettarini,C Bozzi,G Calderini,M Carpinelli,M.A Ciocci,V Ciulli,R Dell'Orso,R Fantechi,I Ferrante,L Foà,F Forti,A Giassi,M.A Giorgi,A Gregorio,F Ligabue,A Lusiani,P.S Marrocchesi,A Messineo,G Rizzo,G Sanguinetti,A Sciabà,P Spagnolo,J Steinberger,R Tenchini,G Tonelli,G Triggiani,C Vannini,P.G Verdini,J Walsh,A.P Betteridge,G.A Blair,L.M Bryant,F Cerutti,Y Gao,M.G Green,D.L Johnson,T Medcalf,Ll.M Mir,P Perrodo,J.A Strong,V Bertin,D.R Botterill,R.W Clifft,T.R Edgecock,S Haywood,M Edwards,P Maley,P.R Norton,J.C Thompson,B Bloch-Devaux,P Colas,H Duarte,S Emery,W Kozanecki,E Lançon,M.C Lemaire,E Locci,B Marz,P Perez,J Rander,J.-F Renardy,A Rosowsky,A Roussarie,J.-P Schuller,J Schwindling,D Si Mohand,A Trabelsi,B Vallage,R.P Johnson,H.Y Kim,A.M Litke,M.A McNeil,G Taylor,A Beddall,C.N Booth,R Boswell,S Cartwright,F Combley,I Dawson,A Koksal,M Letho,W.M Newton,C Rankin,L.F Thompson,A Böhrer,S Brandt,G Cowan,E Feigl,C Grupen,G Lutters,J Minguet-Rodriguez,F Rivera,P Saraiva,L Smolik,F Stephan,M Apollonio,L Bosisio,R Della Marina,G Giannini,B Gobbo,F Ragusa,J Rothberg,S Wasserbaech,S.R Armstrong,L Bellantoni,P Elmer,Z Feng,D.P.S Ferguson,Y.S Gao,S González,J Grahl,J.L Harton,O.J Hayes,H Hu,P.A McNamara,J.M Nachtman,W Orejudos,Y.B Pan,Y Saadi,M Schmitt,I.J Scott,V Sharma,J.D Turk,A.M Walsh,Sau Lan Wu,X Wu,J.M Yamartino,M Zheng,G Zobernig

PHYSICS LETTERS B（1995）

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摘要

The lifetime of the B-s(0) meson is measured in approximately 3 million hadronic Z decays accumulated using the ALEPH detector at LEP from 1991 to 1994. Seven different D-s(-) decay modes were reconstructed and combined with an opposite sign lepton as evidence of semileptonic B-s(0) decays. Two hundred and eight D(s)(-)l(+) candidates satisfy selection criteria designed to ensure precise proper time reconstruction and yield a measured B-s(0) lifetime of tau(B-s(0)) = 1.59(-0.15)(+0.17) (stat) +/-0.03 (syst) ps. Using a larger, less constrained sample of events, the product branching ratio is measured to be Br((b) over bar --> B-s(0)) . Br(B-s(0) --> D(s)(-)l(+)nu X) = 0.82 +/- 0.09 (stat)(-0.14)(+0.13) (syst) %.

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