Measurement of b hadron lifetimes in pp collisions at $$\sqrt{s} = 8$$s=8 $$\,\text {Te}\text {V}$$TeV
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10052_2018_Article_5929.pdf
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Author(s)
Sirunyan, A. M
Tumasyan, A.
Adam, W.
Ambrogi, F.
Asilar, E.
Bergauer, T.
Brandstetter, J.
Brondolin, E.
Dragicevic, M.
Erö, J.
Date Issued
June 2018
Journal
European Physical Journal C: Particles and Fields
Publisher
Springer Berlin Heidelberg
Citation
Sirunyan, A. M. et al. "Measurement of b hadron lifetimes in pp collisions at √s = 8 TeV." The European Physical Journal C: Particles and Fields 78 (June 2018): 457 © 2018 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
Measurements are presented of the lifetimes of the B0, Bs0, Λb0, and Bc+ hadrons using the decay channels B0 → J/ψ K ∗(892) 0, B0 → J/ψ KS0, B s0 → J/ψ π+ π-, B s0 → J /ψ ϕ (1020), Λ b0 → J/ψ Λ0, and Bc+ → J/ψ π+. 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 √s = 8 TeV. The B 0 lifetime is measured to be 453.0 ± 1.6 (stat) ± 1.8 (syst) μm in J /ψK∗(892) 0 and 457.8 ± 2.7 (stat) ± 2.8 (syst) μm in J / ψ KS 0, which results in a combined measurement of cτB 0 = 454.1 ± 1.4 (stat) ± 1.7 (syst) μm. The effective lifetime of the B s0 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: cτBs 0 → J/ψ π+ π - = 502.7 ± 10.2 (stat) ± 3.4 (syst) μm and cτB s0 → J / ψϕ(1020) = 443.9 ± 2.0 (stat) ± 1.5 (syst) μm. The Λ b0 lifetime is found to be 442.9 ± 8.2 (stat) ± 2.8 (syst) μm. 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 (τB+)μm. All results are in agreement with current world-average values.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-018-5929-3
