Study Of The Cp Asymmetry Of B-0 -> J/Psi K-S(0) Decays In Aleph R Barate , D Decamp , P Ghez , C Goy , Jp Lees , E Merle , Mn Minard , B Pietrzyk , 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 , 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 Falvard , 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 , Ba Petersen , 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 , M 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 , Aw Halley , 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 , F Ragusa , H Dietl , G Ganis , A Heister , 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 , C Yuan , D Zerwas , G Bagliesi , T Boccali , G Calderini , V Ciulli , L Foa , A Giassi , F Ligabue , A Messineo , F Palla , G Sanguinetti , A Sciaba , G Sguazzoni , R Tenchini , A Venturi , Pg Verdini , Ga Blair , G Cowan , Mg Green , T Medcalf , Ja Strong , Jh Von Wimmersperg-Toeller , 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 , K Cranmer , P Elmer , Dps Ferguson , Y Gao , S Gonzalez , Oj Hayes , H Hu , S Jin , J Kile , Pa Mcnamara , J Nielsen , W Orejudos , Yb Pan , Y Saadi , Ij Scott , J Walsh , Sl Wu , X Wu , G Zobernig PHYSICS LETTERS B（2000）
摘要
The decay B-0 --> J/psi K-S(0) is reconstructed with J/psi --> e(+)e(-) or mu (+)mu (-) and K-S(0) --> pi (+)pi (-). From the full ALEPH dataset at LEP1 of about 4 million hadronic Z decays, 23 candidates are selected with an estimated purity of 71%, They are used to measure the CP asymmetry of this decay, given by sin 2 beta in the Standard Model, with the result sin 2 beta = 0.84(-1.04)(+0.82) +/- 0.16. This is combined with existing measurements from other experiments, and increases the confidence level that CP violation has been observed in this channel to 98%. (C) 2000 Elsevier Science B.V. All rights reserved.
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