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Measurements of the B -> X-s gamma branching fraction and photon spectrum from a sum of exclusive final states
BaBar Collaboration
2005
发表期刊PHYSICAL REVIEW D
卷号72期号:5
通讯作者Aubert, B (reprint author), Phys Particules Lab, F-74941 Annecy Le Vieux, France.
摘要Using 88.9 million B (B) over bar events collected by the BABAR detector at the Upsilon(4S), we measure the branching fraction for the radiative penguin process B -> X(s)gamma from the sum of 38 exclusive final states. The inclusive branching fraction above a minimum photon energy E-gamma> 1.9 GeV is B(b -> s gamma)=(3.27 +/- 0.18(stat)(-0.40)(+0.55)(syst)(-0.09)(+0.04)(theory))x10(-4). We also measure the isospin asymmetry between B--> X(s (u) over bar)gamma and (B) over bar (0)-> X(s (d) over bar)gamma to be Delta(0-)=-0.006 +/- 0.058(stat)+/- 0.009(syst)+/- 0.024((B) over bar (0)/B-). The photon energy spectrum is measured in the B rest frame, from which moments are derived for different values of the minimum photon energy. We present fits to the photon spectrum and moments which give the heavy-quark parameters m(b) and mu(pi)(2). The fitted parameters are consistent with those obtained from semileptonic B -> X(c)l nu decays, and are useful inputs for the extraction of \V-ub\ from measurements of semileptonic B -> X(u)l nu decays.
关键词RARE-B-DECAYS HEAVY-QUARK PARAMETERS QCD B->S-GAMMA DETECTOR MOMENTS PHYSICS SCHEME GAMMA RATIO
学科领域Astronomy & Astrophysics; Physics
DOI10.1103/PhysRevD.72.052004
收录类别SCI
语种英语
WOS类目Astronomy & Astrophysics ; Physics, Particles & Fields
WOS记录号WOS:000232230000016
引用统计
被引频次:390[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/311005/212602
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. Measurements of the B -> X-s gamma branching fraction and photon spectrum from a sum of exclusive final states[J]. PHYSICAL REVIEW D,2005,72(5).
APA BaBar Collaboration.(2005).Measurements of the B -> X-s gamma branching fraction and photon spectrum from a sum of exclusive final states.PHYSICAL REVIEW D,72(5).
MLA BaBar Collaboration."Measurements of the B -> X-s gamma branching fraction and photon spectrum from a sum of exclusive final states".PHYSICAL REVIEW D 72.5(2005).
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