ICHEP00 770 Determination of the B → D ∗ ℓν Decay Width and |Vcb|
J. P. Alexander,R. Baker,C. Bebek,B. E. Berger,K. Berkelman,F. Blanc,V. Boisvert,D. G. Cassel,M. Dickson,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,C. D. Jones,D. L. Kreinick,M. Lohner,A. Magerkurth,T. O. Meyer,N. B. Mistry,E. Nordberg,J. R. Patterson,D. Peterson,D. Riley,J. G. Thayer,D. Urner,B. Valant-Spaight,A. Warburton,P. Avery,C. Prescott,A. I. Rubiera,J. Yelton,J. Zheng,G. Brandenburg,A. Ershov,Y. S. Gao,D. Y.-J. Kim,R. Wilson,T. E. Browder,Y. Li,J. L. Rodriguez,H. Yamamoto,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,C. Plager,C. Sedlack,M. Selen,J. J. Thaler,J. Williams,K. W. Edwards,R. Janicek,P. M. Patel,A. J. Sadoff,R. Ammar,A. Bean,D. Besson,R. Davis,N. Kwak,X. Zhao,S. Anderson,V. V. Frolov,Y. Kubota,S. J. Lee,R. Mahapatra,J. J. O’Neill,R. Poling,T. Riehle,A. Smith,C. J. Stepaniak,J. Urheim,S. Ahmed,M. S. Alam,S. B. Athar,L. Jian,L. Ling,M. Saleem,S. Timm,F. Wappler,A. Anastassov,J. E. Duboscq,E. Eckhart,K. K. Gan,C. Gwon,T. Hart,K. Honscheid,D. Hufnagel,H. Kagan,R. Kass,T. K. Pedlar,H. Schwarthoff,J. B. Thayer,E. von Toerne,M. M. Zoeller,S. J. Richichi,H. Severini,P. Skubic,A. Undrus,S. Chen,J. Fast,J. W. Hinson,J. Lee,D. H. Miller,E. I. Shibata,I. P. J. Shipsey,V. Pavlunin,D. Cronin-Hennessy,A. L. Lyon,E. H. Thorndike,C. P. Jessop,M. L. Perl,V. Savinov,X. Zhou,T. E. Coan,V. Fadeyev,Y. Maravin,I. Narsky,R. Stroynowski,J. Ye,T. Wlodek,M. Artuso,R. Ayad,C. Boulahouache,K. Bukin,E. Dambasuren,S. Karamov,G. Majumder,G. C. Moneti,R. Mountain,S. Schuh,T. Skwarnicki,S. Stone,G. Viehhauser,J. C. Wang,A. Wolf,J. Wu,S. Kopp,A. H. Mahmood,S. E. Csorna,I. Danko,K. W. McLean,Sz. Márka,Z. Xu,R. Godang,K. Kinoshita,I. C. Lai,S. Schrenk,G. Bonvicini,D. Cinabro,S. McGee,L. P. Perera,G. J. Zhou,E. Lipeles,S. P. Pappas,M. Schmidtler,A. Shapiro,W. M. Sun,A. J. Weinstein,F. Würthwein,D. E. Jaffe,G. Masek,H. P. Paar,E. M. Potter,V. Sharma,D. M. Asner,A. Eppich,T. S. Hill,R. J. Morrison,R. A. Briere,G. P. Chen,B. H. Behrens,W. T. Ford,A. Gritsan,J. Roy,J. G. Smith
semanticscholar（2000）
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摘要
We determine the CKM matrix element |Vcb| using a sample of 3.33 million BB̄ events in the CLEO detector at CESR. We determine the yield of reconstructed B → D∗+lν decays as a function of w = vB · vD∗ , and from this we obtain the differential decay rate dΓ/dw. By extrapolating dΓ/dw to w = 1, the kinematic point at which the D is at rest relative to the B, we extract the product |Vcb|F (1), where F (1) is the form factor at w = 1 and is predicted accurately by theory. We find F (1)|Vcb| = 0.0424±0.0018(stat.)±0.0019(syst.). We also integrate the differential decay rate over w to obtain B(B → D∗+lν) = (5.66 ± 0.29 ± 0.33)%. All results are preliminary. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . Submitted to XXXth International Conference on High Energy Physics, July 2000, Osaka, Japan
