A Study Of The Decay Width Difference In The B-S(0)-(B)Over-Bar(S)(0) System Using Phi Phi Correlations

R Barate,D Decamp,P Ghez,C Goy,Jp Lees,E Merle,Mn Minard,B Pietrzyk,R Alemany,S Bravo,Mp Casado,M Chmeissani,Jm Crespo,E Fernandez,M Fernandez-Bosman,L Garrido,E Grauges,M Martinez,G Merino,R Miquel,Lm 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,J Lin,Q Ouyang,T Wang,Y Xie,R Xu,S Xue, J Zhang, L Zhang,W Zhao,D Abbaneo,G Boix,O Buchmuller,M Cattaneo,F Cerutti,G Dissertori,H Drevermann,Rw Forty,M Frank,Tc Greening,Aw Halley,Jb Hansen,J Harvey,P Janot,B Jost,I Lehraus,P Mato,A Minten,A Moutoussi,F Ranjard,L Rolandi,D Schlatter,M Schmitt,O Schneider,P Spagnolo,W Tejessy,F Teubert, E Tournefier,Ae Wright,Z Ajaltouni,F Badaud,G Chazelle,O Deschamps, A Favard,P Gay,C Guicheney,P Henrard,J Jousset,B Michel,S Monteil,Jc Montret,D Pallin,P Perret,F Podlyski,Jd Hansen,Jr Hansen,Ph Hansen,Bs Nilsson,A Waananen,G Daskalakis, A Kyriakis,C Markou,E Simopoulou,A Vayaki,A Blondel,G Bonneaud,Jc Brient,A Rouge,M Rumpf,M Swynghedauw,M Verderi,H Videau,E Focardi,G Parrini,K Zachariadou,A Antonelli,G Bencivenni,G Bologna,F Bossi,P Campana,G Capon,V Chiarella,P Laurelli,G Mannocchi,F Murtas,Gp Murtas,L Passalacqua,M Pepe-Altarelli,Jg Lynch,P Negus,V O'Shea,C Raine,P Teixeira-Dias,As Thompson,R Cavanaugh,S Dhamotharan,C Geweniger,P Hanke, G Hansper,V Hepp,Ee Kluge,A Putzer,J Sommer,K Tittel,S Werner,M Wunsch,R Beuselinck,Dm Binnie,W Cameron,Pj Dornan,M Girone,N Marinelli,Jk Sedgbeer,Jc Thompson,E Thomson,Vm Ghete,P Girtler,E Kneringer,D Kuhn,G Rudolph,Ck Bowdery,Pg Buck,Aj Finch,F Foster,G Hughes,Rwl Jones,Na Robertson,I Giehl,K Jakobs,K Kleinknecht,G Quast,B Renk,E Rohne,Hg Sander,H Wachsmuth,C Zeitnitz,A Bonissent,J Carr,P Coyle,O Leroy,P Payre,D Rousseau,M Talby,M Aleppo,M Antonelli,F Ragusa,H Dietl, C Ganis,K Huttmann,G Lutjens,C Mannert,W Manner,Hg Moser,S Schael,R Settles,H Stenzel,W Wiedenmann,G Wolf,P Azzurri,J Boucrot,O Callot,S Chen,A Cordier,M Davier,L Duflot,Jf Grivaz,P Heusse,A Jacholkowska,F Le Diberder,J Lefrancois,Am Lutz,Mh Schune,Jj Veillet,I Videau,D Zerwas,G Bagliesi,T Boccali,G Calderini,V Ciulli,L Foa,A Giassi,F Ligabue,A Messineo,F Palla,G Rizzo,G Sanguinetti, A Sciaba,G Sguazzoni,R Tenchini,A Venturi,Pg Verdini,Ga Blair,G Cowan,Mg Green,T Medcalf,Ja Strong,Rw Clifft,Tr Edgecock,Pr Norton,Ir Tomalin,B Bloch-Devaux,P Colas,S Emery,W Kozanecki,E Lancon,Mc Lemaire,E Locci,P Perez,J Rander,Jf Renardy,A Roussarie,Jp Schuller,J Schwindling,A Trabelsi,B Vallage,Sn Black,Jh Dann,Rp Johnson,Hy Kim,N Konstantinidis,Am Litke,Ma Mcneil,G Taylor,Cn Booth,S Cartwright,F Combley,M Lehto,Lf Thompson,K Affholderbach,A Bohrer,S Brandt,C Grupen,A Misiejuk,G Prange,U Sieler,G Giannini,B Gobbo,J Rothberg,S Wasserbaech,Sr Armstrong,P Elmer,Dps Ferguson,Y Cao,S Gonzalez,Oj Hayes,H Hu,S Jin,J Kile,Pa Mcnamara,J Nielsen,W Orejudos,Yb Pan,Y Saadi,Ij Scott,J Walsh,Jh Von Wimmersperg-Toeller,Sl Wu,X Wu,G Zobernig

PHYSICS LETTERS B（2000）

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Abstract

In a data sample of about four million hadronic Z decays recorded with the ALEPH detector from 1991 to 1995. the B-s(0) --> (Ds(*)+Ds()*()-) decay is observed, based on tagging the final state with two phi mesons in the same hemisphere. The D-s((*)+) D-s((*)-) final state is mostly CP even and corresponds to the short-lived B-s(0) mass eigenstate. The branching ratio of this decay is measured to be BR(B-s(0)(short) --> D-s((*)+) D-s((*)-)) = (23 +/- 10(-9)(+19))%. A measurement of the lifetime of the B-s(0)(short) gives 1.27 +/- 0.33 +/- 0.08 ps. The lifetime and branching ratio measurements provide two essentially independent methods of estimating the relative decay width difference Delta Gamma/Gamma in the B-s(0)-(B) over bar(s)(0) system, corresponding to an average value Delta Gamma/Gamma = (25+/-(21)(14))%. (C) 2000 Elsevier Science B.V. All rights reserved.

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Key words

decay,b0s–,correlations

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