Observation Of D(0)-]K+Pi-

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

PHYSICAL REVIEW LETTERS（1994）

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摘要

Using the CLEO II data sample, with an integrated luminosity of 1.8 fb-1 at and near the UPSILON(4S) resonance, we have observed a signal for D0 --> K+pi-, which could be due to either D0D0BAR mixing or doubly Cabibbo suppressed decay, or a combination of the two. We find B(D0 --> K+pi-)/B(D0 --> K- pi+)= 0.0077 +/- 0.0025 (stat) +/- 0.0025 (syst).

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