Determinations of /V(ub)/ from Inclusive Semileptonic B Decays with Reduced Model Dependence.

Aubert, B. ; Barate, R. ; Boutigny, D. ; Couderc, F. ; Karyotakis, Y.

Technical Information Center Oak Ridge Tennessee

关键词: B mesons;    Decay;    Leptons;    Mass distribution;    Phase space;   

RP-ID  :  DE2006876044

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

We report two novel determinations of /V(sub ub)/ with reduced model dependence, based on measurements of the mass distribution of the hadronic system in semileptonic B decays. Events are selected by fully reconstructing the decay of one B meson and identifying a charged lepton from the decay of the other B meson from (Upsilon)(4S) (yields) (B(bar B) events. In one approach, we combine the inclusive (bar B) (yields) X(sub u)(ell)(bar (nu)) rate with a measurement of the inclusive B (yields) X(sub s)(gamma) photon energy spectrum. We obtain /V(sub ub)/ = (4.43 (+-) 0.38(sub stat) (+-) 0.25(sub syst) (+-) 0.29(sub theo)) x 10(sup -3). In another approach we measure the total (bar B) (yields) X(sub u) (ell)(bar (nu)) rate over the full phase space and find /V(sub ub)/ = (3.84 (+-) 0.70(sub stat) (+-) 0.30(sub syst) (+-) 0.10(sub theo)) x 10(sup -3).