Experimental Limits On Weak Annihilation Contributions To B -> Ul Nu Decays

J. L. Rosner,N. E. Adam,J. P. Alexander,K. Berkelman,D. G. Cassel,J. E. Duboscq,K. M. Ecklund,R. Ehrlich,L. Gibbons,R. Gray,S. W. Gray,D. L. Hartill,B. K. Heltsley,D. Hertz,C. D. Jones,J. Kandaswamy,D. L. Kreinick,V. E. Kuznetsov,H. Mahlke-Kruger,T. O. Meyer,P. U. E. Onyisi,J. R. Patterson,D. Peterson,E. A. Phillips,J. Pivarski,D. Riley,A. Ryd,A. J. Sadoff,H. Schwarthoff,X. Shi,S. Stroiney,W. M. Sun,T. Wilksen,M. Weinberger,S. B. Athar,P. Avery,L. Breva-Newell,R. Patel,V. Potlia,H. Stoeck,J. Yelton,P. Rubin,C. Cawlfield,B. I. Eisenstein,I. Karliner,D. Kim,N. Lowrey,P. Naik,C. Sedlack,M. Selen,J. J. Thaler,E. J. White,J. Wiss,M. R. Shepherd,D. M. Asner,K. W. Edwards,D. Besson,T. K. Pedlar,D. Cronin-Hennessy,K. Y. Gao,D. T. Gong,J. Hietala,Y. Kubota,T. Klein,B. W. Lang,R. Poling,A. W. Scott,A. Smith,S. Dobbs,Z. Metreveli,K. K. Seth,A. Tomaradze,P. Zweber,J. Ernst,H. Severini,S. A. Dytman,S. Mehrabyan,J. A. Mueller,V. Savinov,A. Lopez,H. Mendez,J. Ramirez,G. S. Huang,D. H. Miller,B. Sanghi,G. S. Adams,M. Anderson,J. P. Cummings,I. Danko,J. Napolitano,H. Muramatsu,E. H. Thorndike,T. E. Coan,Y. S. Gao,F. Liu,R. Stroynowski,M. Artuso, C. Boulahouache,S. Blusk,J. Butt,J. Li,N. Menaa,S. Nisar,K. Randrianarivony,R. Redjimi,R. Sia,T. Skwarnicki,J. C. Wang,K. Zhang,G. Bonvicini,D. Cinabro,M. Dubrovin,A. Lincoln,A. J. Weinstein,R. A. Briere,G. P. Chen,J. Chen,T. Ferguson,G. Tatishvili,H. Vogel,M. E. Watkins,D. Cinabro,M. Dubrovin,A. Lincoln,A. Weinstein,R. Briere,G. Chen,J. Chen,T. Ferguson,G. Tatishvili,H. Vogel,M. Watkins

PHYSICAL REVIEW LETTERS（2006）

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摘要

We present the first experimental limits on high-q(2) contributions to charmless semileptonic B decays of the form expected from the weak annihilation (WA) decay mechanism. Such contributions could bias determinations of vertical bar V(ub)vertical bar from inclusive measurements of B -> X(u)l nu. Using a wide range of models based on available theoretical input we set a limit of Gamma(WA)/Gamma(b -> u)< 7.4% (90% confidence level) on the WA fraction, and assess the impact on previous inclusive determinations of vertical bar V(ub)vertical bar.

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关键词

factorization,detector,confidence level,mass spectrum,hadrons,parameters

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