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Measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic end point and determination of vertical bar V-ub vertical bar
BaBar Collaboration
2006
发表期刊PHYSICAL REVIEW D
卷号73期号:1
通讯作者Aubert, B (reprint author), Lab Phys Particules, F-74941 Annecy Le Vieux, France.
摘要We present a measurement of the inclusive electron spectrum in B -> X(u)e nu decays near the kinematic limit for B -> X(c)e nu transitions, using a sample of 88 x 10(6) B (B) over bar pairs recorded by the BABAR detector at the Upsilon(4S) resonance. Partial branching fraction measurements are performed in five overlapping intervals of the electron momentum; for the interval of 2.0-2.6 GeV/c we obtain Delta B(B -> X(u)e nu) = (0.572 +/- 0.041(stat) +/- 0.065(syst)) x 10(-3). Combining this result with shape function parameters extracted from BABAR measurements of moments of the inclusive photon spectrum in B -> X(s)gamma decays and moments of the hadron-mass and lepton-energy spectra in B -> X(c)l nu decays we determine vertical bar V(ub)vertical bar = (4.44 +/- 0.25(exp-0.38SF)(+0.42) +/- 0.22(theory)) x 10(-3). Here the first error represents the combined statistical and systematic experimental uncertainties of the partial branching fraction measurement, the second error refers to the uncertainty of the determination of the shape function parameters, and the third error is due to theoretical uncertainties in the QCD calculations.
关键词MESON DECAYS BRANCHING RATIO QUARK-MODEL QCD DISTRIBUTIONS HADRONS SHAPE PHYSICS LEP
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.73.012006
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000235009900011
引用统计
被引频次:74[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.ihep.ac.cn/handle/311005/212642
专题实验物理中心
作者单位中国科学院高能物理研究所
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BaBar Collaboration. Measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic end point and determination of vertical bar V-ub vertical bar[J]. PHYSICAL REVIEW D,2006,73(1).
APA BaBar Collaboration.(2006).Measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic end point and determination of vertical bar V-ub vertical bar.PHYSICAL REVIEW D,73(1).
MLA BaBar Collaboration."Measurement of the inclusive electron spectrum in charmless semileptonic B decays near the kinematic end point and determination of vertical bar V-ub vertical bar".PHYSICAL REVIEW D 73.1(2006).
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