Measurement of broken vertical bar V-ub vertical bar near the endpoint of the electron momentum spectrum from semileptonic B-meson decays

	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
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.
学科主题	Physics
类目[WOS]	Physics, Multidisciplinary
收录类别	SCI
语种	英语
WOS记录号	WOS:000231105400005
公开日期	2016-02-26
内容类型	期刊论文
源URL	[http://ir.ihep.ac.cn/handle/311005/212579]
专题	高能物理研究所_实验物理中心
作者单位	中国科学院高能物理研究所
推荐引用方式 GB/T 7714	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.