Measurement of the Inclusive Electron Spectrum in Charmless Semileptonic B Decays near the Kinematic Endpoint and Determination of V(sub ub).

Skovpen, Y.

Technical Information Center Oak Ridge Tennessee

关键词: B mesons;    Electrons;    Branching ratio;    Resonance;    Decay;   

RP-ID  :  DE2004829760

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

A preliminary result on the study of the inclusive electron spectrum in B(yields) X(sub u)e(nu) decays above the kinematic limit for the dominant B(yields) X(sub c)e(nu) transitions is presented. This study is performed at the PEP-II asymmetric B Factory, where B meson pairs are produced in the decay of the(Upsilon)(4S) resonance. For the electron momentum range of 2.3-2.6 GeV/c in the(Upsilon)(4S) rest frame, the partial branching ratio is measured to be(Delta)(Beta)(B(yields) X(sub u)e(nu))= (0.152(+-) 0.014(+-) 0.014)(center dot) 10(sup -3).