Measurement Of The B -> Dl Nu Branching Fractions And Form Factor

J. Bartelt,S. E. Csorna,K. W. McLean,S. Marka,Z. Xu,R. Godang,K. Kinoshita,I. C. Lai,P. Pomianowski,S. Schrenk,G. Bonvicini,D. Cinabro,R. Greene,L. P. Perera,G. J. Zhou,S. Chan,G. Eigen, E. Lipeles,J. S. Miller,M. Schmidtler,A. Shapiro,W. M. Sun,J. Urheim,A. J. Weinstein, F. Würthwein,D. E. Jaffe, G. Masek,H. P. Paar,E. M. Potter, S. Prell,V. Sharma,D. M. Asner, J. Gronberg,T. S. Hill,D. J. Lange,R. J. Morrison,H. N. Nelson,T. K. Nelson,D. Roberts,B. H. Behrens,W. T. Ford,A. Gritsan,H. Krieg,J. Roy,J. G. Smith, J. P. Alexander,R. Baker,C. Bebek,B. E. Berger,K. Berkelman, V. Boisvert,D. G. Cassel,D. S. Crowcroft,M. Dickson,S. von Dombrowski, P. S. Drell,K. M. Ecklund,R. Ehrlich,A. D. Foland,P. Gaidarev, L. Gibbons,B. Gittelman,S. W. Gray,D. L. Hartill,B. K. Heltsley,P. I. Hopman,J. Kandaswamy,D. L. Kreinick,T. Lee,Y. Liu,N. B. Mistry,C. R. Ng, E. Nordberg,M. Ogg,J. R. Patterson, D. Peterson, D. Riley, A. Soffer,B. Valant-Spaight,A. Warburton,C. Ward,M. Athanas, P. Avery,C. D. Jones,M. Lohner, C. Prescott,A. I. Rubiera, J. Yelton, J. Zheng, G. Brandenburg,R. A. Briere, A. Ershov,Y. S. Gao,J. Kim,R. Wilson, H. Yamamoto,T. E. Browder,J. L. Rodriguez,S. K. Sahu,T. Bergfeld, B. I. Eisenstein, J. Ernst,G. E. Gladding,G. D. Gollin,R. M. Hans,E. Johnson, I. Karliner,M. A. Marsh,M. Palmer,M. Selen,J. J. Thaler, K. W. Edwards, A. Bellerive,R. Janicek,P. M. Patel,A. J. 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. J. Lee,J. J. O'Neill, R. Poling,T. Riehle, A. Smith,M. S. Alam,S. B. Athar,Z. Ling, A. H. Mahmood,S. Timm,F. Wappler, A. Anastassov,J. E. Duboscq,K. K. Gan, T. Hart,K. Honscheid,H. Kagan, R. Kass,J. Lee,H. Schwarthoff, A. Wolf, M. M. Zoeller,S. J. Richichi, H. Severini, P. Skubic, A. Undrus,M. Bishai, S. Chen, J. W. Hinson,N. Menon, D. H. Miller,E. I. Shibata, I. P. J. Shipsey,S. Glenn,Y. Kwon,A. L. Lyon,S. Roberts,E. H. Thorndike, C. P. Jessop,K. Lingel,H. Marsiske,M. L. Perl, V. Savinov, D. Ugolini,X. Zhou,T. E. Coan,V. Fadeyev, I. Korolkov, Y. Maravin,I. Narsky, R. Stroynowski,J. Ye, T. Wlodek,M. Artuso,E. Dambasuren,S. Kopp,G. C. Moneti, T. Skwarnicki,A. Titov,G. Viehhauser,J. C. Wang,S. Schuh, T. Skwarnicki,S. Stone,A. Titov,G. Viehhauser, J. Wang

PHYSICAL REVIEW LETTERS（1999）

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摘要

Using a sample of 3.3 x 10(6) B-meson decays collected with the CLEO detector at the Cornell Electron Storage Ring, we have studied B- --> D(0)l(-)<(nu)over bar> and (B) over bar(0) --> D(+)l(-)<(nu)over bar> decays, where l(-) can be either e(-) or mu(-). We distinguish B --> Dl nu from other B semileptonic decays by examining the net momentum and energy of the particles recoiling against D - l pairs. We find Gamma(B --> Dl nu) = (14.1 +/- 1.0 +/- 1.2) ns(-1) and derive branching fractions for B- --> D(0)l(-)<(nu)over bar> and (B) over bar(0) --> D(+)l(-)<(nu)over bar> of (2.32 +/- 0.17 +/- 0.20)% and (2.20 +/- 0.16 +/- 0.19)%, respectively, where the uncertainties are statistical and systematic. We also investigate the B --> Dl nu form factor and the implication of the result for \V-cb\.

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