Two measurements ofB0B¯0mixing

J. Bartelt,S. E. Csorna,Z. Egyed,V. Jain,P. Sheldon,D. S. Akerib,B. Barish,M. Chadha,S. Chan,D. F. Cowen,G. Eigen,J. S. Miller,C. O’Grady,J. Urheim,A. J. Weinstein,D. Acosta,M. Athanas,G. Masek,B. Ong,H. Paar,M. Sivertz,A. Bean,J. Gronberg,R. Kutschke,S. Menary,R. J. Morrison,S. Nakanishi,H. N. Nelson,T. K. Nelson,J. D. Richman,A. Ryd,H. Tajima,D. Schmidt,D. Sperka,M. S. Witherell,M. Procario,S. Yang,R. Balest,K. Cho,M. Daoudi,W. T. Ford,D. R. Johnson,K. Lingel,M. Lohner,P. Rankin,J. G. Smith,J. P. Alexander,C. Bebek,K. Berkelman,D. Besson,T. E. Browder,D. G. Cassel,H. A. Cho,D. M. Coffman,P. S. Drell,R. Ehrlich,R. S. Galik,M. Garcia-Sciveres,B. Geiser,B. Gittelman,S. W. Gray,D. L. Hartill,B. K. Heltsley,C. D. Jones,S. L. Jones,J. Kandaswamy,N. Katayama,P. C. Kim,D. L. Kreinick,G. S. Ludwig,J. Masui,J. Mevissen,N. B. Mistry,C. R. Ng,E. Nordberg,M. Ogg,J. R. Patterson,D. Peterson,D. Riley,S. Salman,M. Sapper,H. Worden,M. Worris,F. Würthwein,P. Avery,A. Freyberger,J. Rodriguez,R. Stephens,J. Yelton,D. Cinabro,S. Henderson,K. Kinoshita,T. Liu,M. Saulnier,R. Wilson,H. Yamamoto,M. Selen,A. J. Sadoff,R. Ammar,S. Ball,P. Baringer,D. Coppage,N. Copty,R. Davis,N. Hancock,M. Kelly,N. Kwak,H. Lam,Y. Kubota,M. Lattery,J. K. Nelson,S. Patton,D. Perticone,R. Poling,V. Savinov,S. Schrenk,R. Wang,M. S. Alam,I. J. Kim,B. Nemati,J. J. O’Neill,V. Romero,H. Severini,C. R. Sun,M. M. Zoeller,G. Crawford,C. M. Daubenmier,R. Fulton,D. Fujino,K. K. Gan,K. Honscheid,H. Kagan,R. Kass,J. Lee,R. Malchow,F. Morrow,Y. Skovpen,M. Sung,C. White,J. Whitmore,P. Wilson,F. Butler,X. Fu,G. Kalbfleisch,M. Lambrecht,W. R. Ross,P. Skubic,J. Snow, P. L. Wang,M. Wood,D. Bortoletto,D. N. Brown,J. Fast,R. L. McIlwain,T. Miao,D. H. Miller,M. Modesitt,S. F. Schaffner,E. I. Shibata,I. P. J. Shipsey,P. N. Wang,M. Battle,J. Ernst,H. Kroha,S. Roberts,K. Sparks,E. H. Thorndike,C. H. Wang,J. Dominick,S. Sanghera,T. Skwarnicki,R. Stroynowski,M. Artuso,D. He,M. Goldberg,N. Horwitz,R. Kennett,G. C. Moneti,F. Muheim,Y. Mukhin,S. Playfer,Y. Rozen,S. Stone,M. Thulasidas,G. Vasseur,G. Zhu

Physical Review Letters（1993）

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摘要

We have measured the B0B¯0 mixing probability, χd, using a sample of 965 000 BB¯ pairs from Υ(4S) decays. Counting dilepton events, we find χd=0.157±0.016±0.018−0.021+0.028. Using tagged B0 events, we find χd=0.149±0.023±0.019±0.010. The first (second) error is statistical (systematic). The third error reflects a ±15% uncertainty in the assumption, made in both cases, that charged and neutral B pairs contribute equally to dilepton events. We also obtain a limit on the CP impurity in the Bd0 system, ‖Re(εB0)‖<0.045 at 90% C.L.Received 29 April 1993DOI:https://doi.org/10.1103/PhysRevLett.71.1680©1993 American Physical Society

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