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Inclusive semileptonic branching ratios of b hadrons produced in Z decays

文献类型：期刊论文

作者ALEPH Collaboration
刊名EUROPEAN PHYSICAL JOURNAL C
出版日期2002
卷号22期号:4页码:613-626
关键词SEMI-LEPTONIC DECAYS PARTICLE PHYSICS ALEPH DETECTOR MESONS MASS LEP PERFORMANCE TAG
通讯作者Heister, A (reprint author), Rhein Westfal TH Aachen, Inst Phys, D-52056 Aachen, Germany.
英文摘要A measurement of the inclusive semileptonic branching ratios of b hadrons produced in Z decay, is presented, using four million hadronic events collected by the ALEPH detector from 1991 to 1995. Electrons and muons are selected opposite to b-tagged hemispheres. Two different methods are explored to distinguish the contributions from direct b --> Xlnu and cascade b --> c --> Xlnu decays to the total lepton yield. One is based on the lepton transverse momentum spectrum, the other makes use of the correlation between the charge of the lepton and charge estimators built from tracks in the opposite hemisphere of the event. The latter method reduces the dependence on the modelling of semileptonic b decays. The results obtained by averaging the two techniques are BR(b --> Xlnu) = 0.1070 +/- 0.0010(stat) +/- 0.0023(syst) +/- 0.0026 (model), BR(b --> c --> Xlnu) = 0.0818 +/- 0.0015(stat) +/- 0.0022(Syst) (+0.0010)(-0.0014) (model).
学科主题Physics
类目[WOS]Physics, Particles & Fields
收录类别SCI
语种英语
WOS记录号WOS:000174227000001
公开日期2016-02-25
源URL[http://ir.ihep.ac.cn/handle/311005/212176]  
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		 ALEPH Collaboration. Inclusive semileptonic branching ratios of b hadrons produced in Z decays[J]. EUROPEAN PHYSICAL JOURNAL C,2002,22(4):613-626.
APA ALEPH Collaboration.(2002).Inclusive semileptonic branching ratios of b hadrons produced in Z decays.EUROPEAN PHYSICAL JOURNAL C,22(4),613-626.
MLA ALEPH Collaboration."Inclusive semileptonic branching ratios of b hadrons produced in Z decays".EUROPEAN PHYSICAL JOURNAL C 22.4(2002):613-626.

入库方式： OAI收割

来源：高能物理研究所

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