Measurement of b hadron lifetimes in pp collisions at root s=8tev
文献类型：期刊论文
| 作者 | Sirunyan, A. M.1; Collaboration, C. M. S.; Tumasyan, A.1; Adam, W.2; Ambrogi, F.2; Asilar, E.2; Bergauer, T.2; Brandstetter, J.2; Brondolin, E.2; Dragicevic, M.2 |
| 刊名 | European physical journal c
 |
| 出版日期 | 2018-06-07 |
| 卷号 | 78期号:6页码:28 |
| ISSN号 | 1434-6044 |
| DOI | 10.1140/epjc/s10052-018-5929-3 |
| 通讯作者 | Sirunyan, a. m.() |
| 英文摘要 | Measurements are presented of the lifetimes of the b-0, b-s(0), lambda(0)(b), and b-c(+) hadrons using the decay channels b-0 -> j/psi k*(892)(0), b-0 -> j/psi k-s(0), b-s(0) -> j/psi pi(+)pi(-), b-s(0) -> j/psi phi(1020), lambda(0)(b) -> j/psi lambda(0), and b-c(+) -> j/psi pi(+). the data sample, corresponding to an integrated luminosity of 19.7 fb(-1), was collected by the cms detector at the lhc in proton-proton collisions at root s = 8tev. the b-0 life-time is measured to be 453.0 +/- 1.6 (stat) +/- 1.8 (syst) mu m in j/psi k*(892)(0) and 457.8 +/- 2.7 (stat) +/- 2.8 (syst) mu m in j/psi k-s(0), which results in a combined measurement of c tau(0) = 454.1 +/- 1.4 (stat) +/- 1.7 (syst) mu m. the effective lifetime of the b-s(0) meson is measured in two decay modes, with contributions from different amounts of the heavy and light eigenstates. this results in two different measured lifetimes: c tau(0)(bs) -> j/psi pi(+)pi(-) = 502.7 +/- 10.2 (stat) +/- 3.4 (syst) mu m and c tau(0)(bs) -> j/psi phi(1020) = 443.9 +/- 2.0 (stat) +/- 1.5 (syst) mu m. the lambda(0)(b) lifetime is found to be 442.9 +/- 8.2 (stat) +/- 2.8 (syst) mu m. the precision from each of these channels is as good as or better than previous measurements. the b-c(+) lifetime, measured with respect to the b+ to reduce the systematic uncertainty, is 162.3 +/- 7.8 (stat) +/- 4.2 (syst) +/- 0.1 (tau(b+)) mu m. all results are in agreement with current world-average values. |
| WOS关键词 | C MESON LIFETIME ; GENERATOR ; BCVEGPY ; DECAY |
| WOS研究方向 | Physics |
| WOS类目 | Physics, Particles & Fields |
| 语种 | 英语 |
| 出版者 | SPRINGER |
| WOS记录号 | WOS:000434419800001 |
| URI标识 | http://www.irgrid.ac.cn/handle/1471x/2177570 |
| 专题 | 高能物理研究所 |
| 通讯作者 | Sirunyan, A. M. |
| 作者单位 | 1.Yerevan Phys Inst, Yerevan, Armenia 2.Inst Hochenergiephys, Vienna, Austria 3.Inst Nucl Problems, Minsk, BELARUS 4.Univ Antwerp, Antwerp, Belgium 5.Vrije Univ Brussel, Brussels, Belgium 6.Univ Libre Bruxelles, Brussels, Belgium 7.Univ Ghent, Ghent, Belgium 8.Catholic Univ Louvain, Louvain La Neuve, Belgium 9.Univ Mons, Mons, Belgium 10.Ctr Brasileiro Pesquisas Fis, Rio De Janeiro, Brazil |
| 推荐引用方式 GB/T 7714 | Sirunyan, A. M.,Collaboration, C. M. S.,Tumasyan, A.,et al. Measurement of b hadron lifetimes in pp collisions at root s=8tev[J]. European physical journal c,2018,78(6):28. |
| APA | Sirunyan, A. M..,Collaboration, C. M. S..,Tumasyan, A..,Adam, W..,Ambrogi, F..,...&Yusli, M. N..(2018).Measurement of b hadron lifetimes in pp collisions at root s=8tev.European physical journal c,78(6),28. |
| MLA | Sirunyan, A. M.,et al."Measurement of b hadron lifetimes in pp collisions at root s=8tev".European physical journal c 78.6(2018):28. |
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来源：高能物理研究所
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