Determinations of |V_{ub}| from Inclusive Semileptonic B Decays with Reduced Model Dependence

Aubert, B.

Stanford Linear Accelerator Center

关键词: Decay;    B Mesons;    Experiment-Hep,Hepex;    Mass Distribution;    72 Physics Of Elementary Particles And Fields;   

DOI  :  10.2172/876044
RP-ID  :  SLAC-PUB-11582
RP-ID  :  AC02-76SF00515
RP-ID  :  876044

美国|英语

来源: UNT Digital 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}.