Abstract
A largely model-independent measurement of the inclusive electron momentum spectrum and branching fraction for semileptonic decays of B mesons is presented based on data recorded at the Υ(4S) resonance with the BABAR detector. Backgrounds from secondary charm decays are separated from prompt B decays using charge and angular correlations between the electron from one B meson and a high momentum electron tag from the second B meson. The resulting branching fraction is B(B→Xeν)=[10.87±0.18(stat)±0.30(syst)]%. Based on this measurement we determine the Cabibbo-Kobayashi-Maskawa (CKM) matrix element |Vcb|. Received 14 August 2002DOI:https://doi.org/10.1103/PhysRevD.67.031101©2003 American Physical Society
Highlights
Background contributions fromB→D D(s)X, D(s) →eeY decays and B→→e decays are estimated by Monte Carlo simulation, using the ISGW2 model9͔ to describe semileptonic D and Ds decays, together with currently known branching fractions: Combining B(Ds→Xe) ϭ(8.12Ϯ0.68)%, which is computed from the average D branching fraction B(D0,ϩ→Xe) ͓1͔ and the lifetime ratios D0,ϩ /Ds, with B(B→DsX)ϭ(9.8Ϯ3.7)% ͓11͔ yields B(B→Ds→e)ϭ(0.80Ϯ0.31)%
we arrive at B(B→D →e)ϭ(0.84Ϯ0.21)%
ϭ(17.83Ϯ0.06)% ͓1͔. This leads to B(B→→e)ϭ(0.565 Ϯ0.063)%
Summary
Background contributions fromB→D D(s)X, D(s) →eeY decays and B→→e decays are estimated by Monte Carlo simulation, using the ISGW2 model9͔ to describe semileptonic D and Ds decays, together with currently known branching fractions: Combining B(Ds→Xe) ϭ(8.12Ϯ0.68)%, which is computed from the average D branching fraction B(D0,ϩ→Xe) ͓1͔ and the lifetime ratios D0,ϩ /Ds, with B(B→DsX)ϭ(9.8Ϯ3.7)% ͓11͔ yields B(B→Ds→e)ϭ(0.80Ϯ0.31)%.
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