Measurement of R-b and Br(b -> lvX) at LEP using double-tag methods
文献类型：期刊论文
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| 刊名 | EUROPEAN PHYSICAL JOURNAL C
 ; EUROPEAN PHYSICAL JOURNAL C
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| 出版日期 | 2000 ; 2000 |
| 卷号 | 13期号:1页码:47-61 |
| 关键词 | SEMILEPTONIC BRANCHING FRACTION FERMION PAIR PRODUCTION LUND MONTE-CARLO JET FRAGMENTATION QED CORRECTIONS L3 EXPERIMENT E+E-PHYSICS DECAY DETECTOR MESONS SEMILEPTONIC BRANCHING FRACTION FERMION PAIR PRODUCTION LUND MONTE-CARLO JET FRAGMENTATION QED CORRECTIONS L3 EXPERIMENT E+E-PHYSICS DECAY DETECTOR MESONS |
| DOI | 10.1007/s100520000296 |
| 通讯作者 | Acciarri, M (reprint author), Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany. ; Acciarri, M (reprint author), Rhein Westfal TH Aachen, Inst Phys 1, D-52056 Aachen, Germany. |
| 英文摘要 | We present a combined measurement of R-b = Gamma(Z --> b (b) over bar)/Gamma(Z --> hadrons) and the semileptonic branching ratio of b quarks in Z decays, Br(b --> l nu X), using double-tag methods. Two analyses are performed on one million hadronic Z decays collected in 1994 and 1995. The first analysis exploits the capabilities of the silicon microvertex detector. The tagging of b-events is based on the large impact parameter of tracks from weakly decaying b-hadrons with respect to the e(+)e(-) collision point. In the second analysis, a high-p(t) lepton tag is used to enhance the b-component in the sample and its momentum spectrum is used to constrain the model dependent uncertainties in the semileptonic b-decay. The analyses are combined in order to provide precise determinations of R-b and Br(b --> l nu X): R-b = 0.2174 +/- 0.0015 (stat.) +/- 0.0028 (sys.); Br(b --> l nu X) = (10.16 +/- 0.13 (stat.) +/- 0.30 (sys.))%.; We present a combined measurement of R-b = Gamma(Z --> b (b) over bar)/Gamma(Z --> hadrons) and the semileptonic branching ratio of b quarks in Z decays, Br(b --> l nu X), using double-tag methods. Two analyses are performed on one million hadronic Z decays collected in 1994 and 1995. The first analysis exploits the capabilities of the silicon microvertex detector. The tagging of b-events is based on the large impact parameter of tracks from weakly decaying b-hadrons with respect to the e(+)e(-) collision point. In the second analysis, a high-p(t) lepton tag is used to enhance the b-component in the sample and its momentum spectrum is used to constrain the model dependent uncertainties in the semileptonic b-decay. The analyses are combined in order to provide precise determinations of R-b and Br(b --> l nu X): R-b = 0.2174 +/- 0.0015 (stat.) +/- 0.0028 (sys.); Br(b --> l nu X) = (10.16 +/- 0.13 (stat.) +/- 0.30 (sys.))%. |
| 学科主题 | Physics ; Physics |
| 类目[WOS] | Physics, Particles & Fields |
| 收录类别 | SCI |
| 语种 | 英语 ; 英语 |
| WOS记录号 | WOS:000087492700004 ; WOS:000087492700004 |
| 公开日期 | 2016-02-25 |
| 源URL | [http://ir.ihep.ac.cn/handle/311005/212046]  |
| 专题 | 高能物理研究所_粒子天体物理中心 |
| 推荐引用方式 GB/T 7714 | . Measurement of R-b and Br(b -> lvX) at LEP using double-tag methods, Measurement of R-b and Br(b -> lvX) at LEP using double-tag methods[J]. EUROPEAN PHYSICAL JOURNAL C, EUROPEAN PHYSICAL JOURNAL C,2000, 2000,13, 13(1):47-61, 47-61. |
| APA | (2000).Measurement of R-b and Br(b -> lvX) at LEP using double-tag methods.EUROPEAN PHYSICAL JOURNAL C,13(1),47-61. |
| MLA | "Measurement of R-b and Br(b -> lvX) at LEP using double-tag methods".EUROPEAN PHYSICAL JOURNAL C 13.1(2000):47-61. |
入库方式： OAI收割
来源：高能物理研究所
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