Measurement of broken vertical bar V-ub vertical bar near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
Belle Collaboration
刊名PHYSICS LETTERS B
2005
卷号621期号:1--2页码:28-40
关键词SUBLEADING SHAPE FUNCTIONS MONTE-CARLO HADRONS BELLE LEP
学科分类Physics
DOI10.1016/j.physletb.2005.06.011
通讯作者Limosani, A (reprint author), High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan.
英文摘要We report measurements of partial branching fractions of inclusive charmless semileptonic B-meson decays at the endpoint of the electron momentum spectrum. The measurements are made in six overlapping momentum intervals that have lower bounds ranging from 1.9 to 2.4 GeV/c and a common upper bound of 2.6 GeV/c, as measured in the centre of mass frame. The results are based on a sample of 29 million B (B) over bar pairs, accumulated by the Belle detector at the KEKB asymmetric e(+)e(-) collider operating on the Y(4S) resonance. In the momentum interval ranging from 1.9 to 2.6 GeV/c we measure the partial branching fraction Delta B(B ->. X(u)ev(e)) = (8.47 +/- 0.37 +/- 1.53) x 10(-4), where the first error is statistical and the second is systematic. A prediction of the partial rate R = (21.69 +/- 3.62(-1.98)(+2.18)), vertical bar Vub vertical bar(2) ps(-1) in this momentum interval based on theory is calculated with input HQET parameters that have been derived from Belle's measurement of the B -> X(s)y photon energy spectrum, where the first error is due to the uncertainty on HQET parameters and the second error is from theory. Using both AB(B -> X(u)ev(e)) and R we find vertical bar Vub vertical bar = (5.08 +/- 0.47 +/- 0.42(-0.23)(+0.26)) x 10(-3), where the first error is from the partial branching fraction, and the second and third errors are from uncertainties in R. (c) 2005 Elsevier B.V. All rights reserved.
类目[WOS]Physics, Multidisciplinary
收录类别SCI
语种英语
WOS记录号WOS:000231105400005
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被引频次:37[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/311005/212579
专题中国科学院高能物理研究所_实验物理中心_期刊论文
作者单位中国科学院高能物理研究所
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Belle Collaboration. Measurement of broken vertical bar V-ub vertical bar near the endpoint of the electron momentum spectrum from semileptonic B-meson decays[J]. PHYSICS LETTERS B,2005,621(1--2):28-40.
APA Belle Collaboration.(2005).Measurement of broken vertical bar V-ub vertical bar near the endpoint of the electron momentum spectrum from semileptonic B-meson decays.PHYSICS LETTERS B,621(1--2),28-40.
MLA Belle Collaboration."Measurement of broken vertical bar V-ub vertical bar near the endpoint of the electron momentum spectrum from semileptonic B-meson decays".PHYSICS LETTERS B 621.1--2(2005):28-40.
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