A study of the decay width difference in the B-s(0)-(B)over-bar(s)(0) system using phi phi correlations

Barate R; Decamp D; Ghez P; Goy C; Lees JP; Merle E; Minard MN; Pietrzyk B; Alemany R; Bravo S; Casado MP; Chmeissani M; Crespo JM; Fernandez E; Fernandez Bosman M; Garrido L; Grauges E; Martinez M; Merino G; Miquel R; Mir LM; Pacheco A; Ruiz H; Colaleo A; Creanza D; de Palma M; Iaselli G; Maggi G; Maggi M; Nuzzo S; Ranieri A; Raso G; Ruggieri F; Selvaggi G; Silvestris L; Tempesta P; Tricomi A; Zito G; Huang X; Lin J; Ouyang Q; Wang T; Xie Y; Xu R; Xue S; Zhang J; Zhang L; Zhao W; Abbaneo D; Boix G; Buchmuller O; Cattaneo M; Cerutti F; Dissertori G; Drevermann H; Forty RW; Frank M; Greening TC; Halley AW; Hansen JB; Harvey J; Janot P; Jost B; Lehraus I; Mato P; Minten A; Moutoussi A; Ranjard F; Rolandi L; Schlatter D; Schmitt M; Schneider O; Spagnolo P; Tejessy W; Teubert F; Tournefier E; Wright AE; Ajaltouni Z; Badaud F; Chazelle G; Deschamps O; Favard A; Gay P; Guicheney C; Henrard P; Jousset J; Michel B; Monteil S; Montret JC; Pallin D; Perret P; Podlyski F; Hansen JD; Hansen JR; Hansen PH; Nilsson BS; Waananen A; Daskalakis G; Kyriakis A; Markou C; Simopoulou E; Vayaki A; Blondel A; Bonneaud G; Brient JC; Rouge A; Rumpf M; Swynghedauw M; Verderi M; Videau H; Focardi E; Parrini G; Zachariadou K; Antonelli A; Bencivenni G; Bologna G; Bossi F; Campana P; Capon G; Chiarella V; Laurelli P; Mannocchi G; Murtas F; Murtas GP; Passalacqua L; Pepe Altarelli M; Lynch JG; Negus P; O'Shea V; Raine C; Teixeira Dias P; Thompson AS; Cavanaugh R; Dhamotharan S; Geweniger C; Hanke P; Hansper G; Hepp V; Kluge EE; Putzer A; Sommer J; Tittel K; Werner S; Wunsch M; Beuselinck R; Binnie DM; Cameron W; Dornan PJ; Girone M; Marinelli N; Sedgbeer JK; Thompson JC; Thomson E; Ghete VM; Girtler P; Kneringer E; Kuhn D; Rudolph G; Bowdery CK; Buck PG; Finch AJ; Foster F; Hughes G; Jones RWL; Robertson NA; Giehl I; Jakobs K; Kleinknecht K; Quast G; Renk B; Rohne E; Sander HG; Wachsmuth H; Zeitnitz C; Bonissent A; Carr J; Coyle P; Leroy O; Payre P; Rousseau D; Talby M; Aleppo M; Antonelli M; Ragusa F; Dietl H; Ganis C; Huttmann K; Lutjens G; Mannert C; Manner W; Moser HG; Schael S; Settles R; Stenzel H; Wiedenmann W; Wolf G; Azzurri P; Boucrot J; Callot O; Chen S; Cordier A; Davier M; Duflot L; Grivaz JF; Heusse P; Jacholkowska A; Le Diberder F; Lefrancois J; Lutz AM; Schune MH; Veillet JJ; Videau I; Zerwas D; Bagliesi G; Boccali T; Calderini G; Ciulli V; Foa L; Giassi A; Ligabue F; MESSINEO, ALBERTO MARIA; Palla F; RIZZO, GIULIANA; Sanguinetti G; Sciaba A; Sguazzoni G; Tenchini R; TONELLI, GUIDO EMILIO; Verdini PG; Blair GA; Cowan G; Green MG; Medcalf T; Strong JA; Clifft RW; Edgecock TR; Norton PR; Tomalin IR; Bloch Devaux B; Colas P; Emery S; Kozanecki W; Lancon E; Lemaire MC; Locci E; Perez P; Rander J; Renardy JF; Roussarie A; Schuller JP; Schwindling J; Trabelsi A; Vallage B; Black SN; Dann JH; Johnson RP; Kim HY; Konstantinidis N; Litke AM; McNeil MA; Taylor G; Booth CN; Cartwright S; Combley F; Lehto M; Thompson LF; Affholderbach K; Bohrer A; Brandt S; Grupen C; Misiejuk A; Prange G; Sieler U; Giannini G; Gobbo B; Rothberg J; Wasserbaech S; Armstrong SR; Elmer P; Ferguson DPS; Cao Y; Gonzalez S; Hayes OJ; Hu H; Jin S; Kile J; McNamara PA; Nielsen J; Orejudos W; Pan YB; Saadi Y; Scott IJ; Walsh J; von Wimmersperg Toeller JH; Wu SL; Wu X; Zobernig G.

doi:10.1016/S0370-2693(00)00750-4

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.