Measurement of the Branching Fraction of e(sup+) e(sup-) yields B(sup o) overbar B (sup o) at the gamma (4S) Resonance.

Technical Information Center Oak Ridge Tennessee

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

RP-ID  :  DE2004829706

学科分类：工程和技术（综合）

美国|英语

来源: National Technical Reports Library

【 摘 要 】

The authors report a measurement of the branching fraction e(sup +)e(sup -) yields B(sup 0)(bar B)(sup 0) with a data sample of 81.7 fb(sup -1) collected at the (Upsilon)(4S) resonance with the BABAR detector at the PEP-II asymmetric-energy e(sup +)e(sup -) storage ring. Using partial reconstruction of the decay (bar B)(sup 0) yields D*(sup +)(ell)(sup -)(bar (nu))(sub (ell)) they obtain a preliminary result of f(sub 00) = 0.486 (+-) 0.010(stat.) (+-) 0.009(sys.). The result does not depend on branching fractions of the (bar B)(sup 0) and the D*(sup +) decay chains, on the simulated reconstruction efficiency, on the ratio of the charged and neutral B meson lifetimes, nor on assumption of isospin symmetry. This measurement is important for normalizing many B decay branching fractions, and contributes to an understanding of isospin violation in the (Upsilon)(4S) system.