Observation Of The Radiative Decay D*+-> D+Gamma

J. Bartelt,S. Csorna,V. Jain,K. McLean, S. Marka,R. Godang,K. Kinoshita,I. Lai,P. Pomianowski,S. Schrenk,G. Bonvicini,D. Cinabro,R. Greene,L. Perera,G. Zhou,B. Barish,M. Chadha,S. Chan,G. Eigen,J. Miller,C. O'Grady, M. Schmidtler,J. Urheim,A. Weinstein,F. Würthwein,D. Bliss,G. Masek,H. Paar,S. Prell,V. Sharma, D. Asner,J. Gronberg,T. Hill,D. Lange,R. Morrison,H. Nelson,T. Nelson,J. Richman,D. Roberts,A. Ryd,M. Witherell,R. Balest,B. Behrens,W. Ford,A. Gritsan,H. Park,J. Roy,J. Smith,J. Alexander,C. Bebek,B. Berger,K. Berkelman,K. Bloom,V. Boisvert,D. Cassel,H. Cho,D. Crowcroft,M. Dickson,S. von Dombrowski,P. Drell,K. Ecklund,R. Ehrlich,A. Foland,P. Gaidarev,L. Gibbons,B. Gittelman,S. Gray,D. Hartill,B. Heltsley,P. Hopman,J. Kandaswamy,P. Kim,D. Kreinick,T. Lee, Y. Liu,N. Mistry,C. Ng,E. Nordberg,M. Ogg,J. Patterson,D. Peterson,D. Riley,A. Soffer,B. Valant-Spaight,C. Ward, M. Athanas,P. Avery,C. Jones,M. Lohner,C. Prescott,J. Yelton,J. Zheng,G. Brandenburg,R. Briere,A. Ershov,Y. Gao,D. Kim,R. Wilson,H. Yamamoto,T. Browder,Y. Li,J. Rodriguez,T. Bergfeld,B. Eisenstein,J. Ernst,G. Gladding,G. Gollin,R. Hans,E. Johnson,I. Karliner,M. Marsh,M. Palmer,M. Selen,J. Thaler,K. Edwards,A. Bellerive,R. Janicek,D. MacFarlane,P. Patel,A. Sadoff,R. Ammar,P. Baringer,A. Bean,D. Besson,D. Coppage,C. Darling,R. Davis,S. Kotov,I. Kravchenko,N. Kwak,L. Zhou,S. Anderson,Y. Kubota,S. Lee,J. O'Neill,S. Patton,R. Poling,T. Riehle,A. Smith,M. Alam,S. Athar,Z. Ling,A. Mahmood,H. Severini,S. Timm,F. Wappler,A. Anastassov,J. Duboscq, D. Fujino,K. Gan,T. Hart,K. Honscheid,H. Kagan,R. Kass,J. Lee,M. Spencer,M. Sung,A. Undrus,R. Wanke,A. Wolf,M. Zoeller, B. Nemati,S. Richichi,W. Ross,P. Skubic,M. Bishai,J. Fast,J. Hinson,N. Menon,D. Miller,E. Shibata,I. Shipsey,M. Yurko,S. Glenn,S. Johnson,Y. Kwon,S. Roberts,E. Thorndike,C. Jessop,K. Lingel,H. Marsiske,M. Perl,V. Savinov,D. Ugolini,R. Wang,X. Zhou,T. Coan,V. Fadeyev,I. Korolkov,Y. Maravin,I. Narsky,V. Shelkov,J. Staeck,R. Stroynowski,I. Volobouev,J. Ye,M. Artuso,F. Azfar,A. Efimov,M. Goldberg,D. He,S. Kopp,G. Moneti,R. Mountain,S. Schuh,T. Skwarnicki,S. Stone,G. Viehhauser,X. Xing

PHYSICAL REVIEW LETTERS（1998）

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摘要

We have observed a signal for the decay D*(+) --> D(+)gamma at a significance of 4 standard deviations. From the measured branching ratio B(D*(+) --> D(+)gamma)/B(D*(+) --> D(+)pi(0)) = 0.055 +/- 0.014 +/- 0.010 we find B(D*(+) --> D(+)gamma) = 0.017 +/- 0.004 +/- 0.003, where the first uncertainty is statistical and the second is systematic. We also report the highest precision determination of the remaining D*(+) branching fractions.

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关键词

standard deviation,elementary particles

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