Limit on B0s oscillation using a jet charge method

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

doi:10.1016/0370-2693(95)00823-4

Abstract

A lower limit is set on the B s 0 meson oscillation parameter Δm s using data collected from 1991 to 1994 by the ALEPH detector. Events with a high transverse momentum lepton and a reconstructed secondary vertex are used. The high transverse momentum leptons are produced mainly by b hadron decays, and the sign of the lepton indicates the particle/antiparticle final state in decays of neutral B mesons. The initial state is determined by a jet charge technique using both sides of the event. A maximum likelihood method is used to set a lower limit of Δm s . The 95% confidence level lower limit on Δm s ranges between 5.2 and 6.5 ( h ̷ c 2) ps −1 when the fraction of b quarks from Z 0 decays that form B s 0 messons is varied from 8% to 16%. Assuming that the B 0 s fraction is 12%, the lower limit would be Δm s > 6.1( h ̷ c 2 ) ps −1 at 95% confidence level. For x s = Δm s τ B s , this limit also gives x s > 8.8 using the B 0 s lifetime of τ B s = 1.55 ± 0.11 ps and shifting the central value of τ B s down by 1σ.

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