Study of the q^{2} dependence of B[over →]πlν and of B[over →]ρ(ω)lν and extraction of |V_{ub}|

S. B. Athar,P. Avery,L. Breva-Newell,V. Potlia,H. Stoeck,J. Yelton,K. W. Edwards,D. Besson,X. Zhao,S. Anderson,V. V. Frolov,D. T. Gong,Y. Kubota,S. Z. Li,R. Poling,A. Smith,C. J. Stepaniak,J. Urheim,Z. Metreveli,K. K. Seth,A. Tomaradze,P. Zweber,S. Ahmed,M. S. Alam,J. Ernst,L. Jian,M. Saleem,F. Wappler,K. Arms,E. Eckhart,K. K. Gan,C. Gwon,K. Honscheid,D. Hufnagel,H. Kagan,R. Kass,T. K. Pedlar,E. von Toerne,M. M. Zoeller,H. Severini, P. Skubic,S. A. Dytman,J. A. Mueller,S. Nam,V. Savinov,J. W. Hinson,J. Lee,D. H. Miller,V. Pavlunin,B. Sanghi,E. I. Shibata,I. P. J. Shipsey,D. Cronin-Hennessy,A. L. Lyon,C. S. Park,W. Park,J. B. Thayer,E. H. Thorndike,T. E. Coan, Y. S. Gao,F. Liu,Y. Maravin,R. Stroynowski,M. Artuso,C. Boulahouache,S. Blusk,E. Dambasuren,O. Dorjkhaidav, R. Mountain,H. Muramatsu,R. Nandakumar,T. Skwarnicki,S. Stone,J. C. Wang,A. H. Mahmood,S. E. Csorna,I. Danko,G. Bonvicini,D. Cinabro,M. Dubrovin,S. McGee,A. Bornheim,E. Lipeles,S. P. Pappas,A. Shapiro,W. M. Sun,A. J. Weinstein,R. A. Briere,G. P. Chen,T. Ferguson,G. Tatishvili,H. Vogel,N. E. Adam,J. P. Alexander,K. Berkelman,V. Boisvert,D. G. Cassel,J. E. Duboscq,K. M. Ecklund,R. Ehrlich,R. S. Galik,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,J. R. Patterson,D. Peterson,J. Pivarski,S. J. Richichi,D. Riley,A. J. Sadoff,H. Schwarthoff,M. R. Shepherd,J. G. Thayer,D. Urner,T. Wilksen,A. Warburton,M. Weinberger

PHYSICAL REVIEW D（2003）

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摘要

We report on determinations of \V-ub\ resulting from studies of the branching fraction and q(2) distributions in exclusive semileptonic B decays that proceed via the b-->u transition. Our data set consists of the 9.7x106B (B) over bar meson pairs collected at the Y(4S) resonance with the CLEO II detector. We measure B(B-0-->pi(-)l(+)nu)=(1.33+/-0.18+/-0.11+/-0.01+/-0.07)x10(-4) and B(B-0-->rho(-)l(+)nu)=(2.17+/-0.34(-0.54)(+0.47)+/-0.41+/-0.01)x10(-4), where the errors are statistical, experimental systematic, systematic due to residual form-factor uncertainties in the signal, and systematic due to residual form-factor uncertainties in the cross-feed modes, respectively. We also find B(B+-->etal(+)nu)=(0.84+/-0.31+/-0.16+/-0.09)x10(-4), consistent with what is expected from the B-->pilnu mode and quark model symmetries. We extract \V-ub\ using light-cone sum rules for 0less than or equal toq(2)<16 GeV2 and lattice QCD for 16 GeV(2)less than or equal toq(2)更多

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