Search For Exclusive B-]U Semileptonic Decays Of B-Mesons

A Bean, J Gronberg, R Kutschke, S Menary,R J Morrison,Harry Norman Nelson, J D Richman,Hiroyasu Tajima, D K Schmidt, D Sperka,Michael S Witherell,M Procario,Shengli Yang, R Ballest, M Daoudi,W T Ford,D R Johnson,K Lingel,M Lohner,P Rankin,J G Smith, J P Alexander,C Bebek,K Berkelman,D Besson,T E Browder,D G Cassel,H A Cho, D M Coffman, P S Drell,R Ehrlich,R S Galik,M Garciasciveres,B Geiser,B Gittelman,S W Gray,D L Hartill, B K Heltsley,K Honscheid,C D Jones,J Kandaswamy,N Katayama,P C Kim,D L Kreinick,G S Ludwig,J Masui,J Mevissen,N B Mistry,C R Ng,E Nordberg,M Ogg, C P Ogrady, J R Patterson,Daniel A Peterson,D Riley,M Sapper,M Selen,H Worden,M Worris,F Wuerthwein,P Avery,A Freyberger,J L Rodriguez,R W Stephens, J Yelton,D Cinabro,S W Henderson,K Kinoshita, Tanghong Liu,M Saulnier,R J Wilson,Hitoshi Yamamoto,A J Sadoff,R Ammar, Stephen D Ball, Ba

Physical review letters（1993）

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摘要

Using a sample of 935 000 BBBAR pairs collected with the CLEO-II detector at the Cornell Storage Ring, we have obtained upper limits on the branching ratios for the b --> ul- nuBAR processes B- --> omegal- nuBAR, B- --> rho0l- nuBAR, and B0BAR --> rho+l- nuBAR. The combined result using the relationships among the widths for these three modes is B(B- --> rho0l- nuBAR) < (1.6-2.7) x 10(-4) at 90% C.L., where the range of values is due to model dependence of the detection efficiencies. These measurements yield the limits \V(ub)/V(cb)\ < 0.08-0.13.

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关键词

decay,interactions,bosons,standard model,elementary particles,particle decay,branching ratio,mathematical models,mathematical model,hadrons,mixing ratio,b mesons,mesons

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