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Measurement of broken vertical bar V-ub vertical bar near the endpoint of the electron momentum spectrum from semileptonic B-meson decays
Belle Collaboration
2005
发表期刊PHYSICS LETTERS B
卷号621期号:1--2页码:28-40
通讯作者Limosani, A (reprint author), High Energy Accelerator Res Org KEK, Tsukuba, Ibaraki, Japan.
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.
关键词SUBLEADING SHAPE FUNCTIONS MONTE-CARLO HADRONS BELLE LEP
学科领域Physics
DOI10.1016/j.physletb.2005.06.011
收录类别SCI
语种英语
WOS类目Physics, Multidisciplinary
WOS记录号WOS:000231105400005
引用统计
被引频次:38[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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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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