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Measurement of b hadron lifetimes in pp collisions at root s=8tev

文献类型:期刊论文

AuthorSirunyan, 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
SourceEuropean physical journal c
Issued Date2018-06-07
Volume78Issue:6Pages:28
ISSN1434-6044
DOI10.1140/epjc/s10052-018-5929-3
Corresponding AuthorSirunyan, a. m.()
English AbstractMeasurements 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 KeywordC MESON LIFETIME ; GENERATOR ; BCVEGPY ; DECAY
WOS Research AreaPhysics
WOS SubjectPhysics, Particles & Fields
Language英语
WOS IDWOS:000434419800001
PublisherSPRINGER
URIhttp://www.irgrid.ac.cn/handle/1471x/2177570
Collection高能物理研究所
Corresponding AuthorSirunyan, A. M.
Affiliation1.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
Recommended Citation
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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