CLNS 01/1773 CLEO 01-26 Improved Measurement of |Vcb | Using ¯ B → D ∗ ℓν Decays
R. A. Briere,G. P. Chen,T. Ferguson,G. Tatishvili,H. Vogel,N. E. Adam,J. P. Alexander,C. Bebek,B. E. Berger,K. Berkelman,F. Blanc,V. Boisvert,D. G. Cassel,P. S. Drell,J. E. Duboscq,K. M. Ecklund,R. Ehrlich,L. Gibbons,B. Gittelman,S. W. Gray,D. L. Hartill,B. K. Heltsley,L. Hsu,C. D. Jones,J. Kandaswamy,D. L. Kreinick,A. Magerkurth,H. Mahlke-Krüger,T. O. Meyer,N. B. Mistry,E. Nordberg,M. Palmer,J. R. Patterson,D. Peterson,J. Pivarski,D. Riley,A. J. Sadoff,H. Schwarthoff,M. R. Shepherd,J. G. Thayer,D. Urner,B. Valant-Spaight,G. Viehhauser,A. Warburton,M. Weinberger,S. B. Athar,P. Avery,H. Stoeck,J. Yelton,G. Brandenburg,A. Ershov,D. Y.-J. Kim,R. Wilson,K. Benslama,B. I. Eisenstein,J. Ernst,G. D. Gollin,R. M. Hans,I. Karliner,N. Lowrey,M. A. Marsh,C. Plager,C. Sedlack,M. Selen,J. J. Thaler,J. Williams,K. W. Edwards,R. Ammar,D. Besson,X. Zhao,S. Anderson,V. V. Frolov,Y. Kubota,S. J. Lee,S. Z. Li,R. Poling,A. Smith,C. J. Stepaniak,J. Urheim,S. Ahmed,M. S. Alam,L. Jian,M. Saleem,F. Wappler,E. Eckhart,K. K. Gan,C. Gwon,T. Hart,K. Honscheid,D. Hufnagel,H. Kagan,R. Kass,T. K. Pedlar,J. B. Thayer,E. von Toerne,T. Wilksen,M. M. Zoeller,S. J. Richichi,H. Severini,P. Skubic,S. A. Dytman,S. Nam,V. Savinov,S. Chen,J. W. Hinson,J. Lee,D. H. Miller,V. Pavlunin,E. I. Shibata,I. P. J. Shipsey,D. Cronin-Hennessy,A. L. Lyon,C. S. Park,W. Park,E. H. Thorndike,T. E. Coan,Y. S. Gao,F. Liu,Y. Maravin,I. Narsky,R. Stroynowski,J. Ye,M. Artuso,C. Boulahouache,K. Bukin,E. Dambasuren,R. Mountain,T. Skwarnicki,S. Stone,J. C. Wang,A. H. Mahmood,S. E. Csorna,I. Danko,Z. Xu,G. Bonvicini,D. Cinabro,M. Dubrovin,S. McGee,A. Bornheim,E. Lipeles,S. P. Pappas,A. Shapiro,W. M. Sun,A. J. Weinstein,G. Masek,H. P. Paar,R. Mahapatra
semanticscholar（2002）
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摘要
We determine the weak coupling |Vcb| between the b and c quarks using a sample of 3 million BB̄ events in the CLEO detector at the Cornell Electron Storage Ring. We determine the yield of reconstructed B̄ → D∗lν decays as a function of w, the boost of the D∗ in the B rest frame, and from this we obtain the differential decay rate dΓ/dw. By extrapolating dΓ/dw to w = 1, the kinematic end-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. We find |Vcb|F(1) = 0.0431 ± 0.0013(stat.) ± 0.0018(syst.).
