Measurement of b hadron lifetimes in pp collisions at √s = 8 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
The European Physical Journal C
Publisher
Springer Berlin Heidelberg
Citation
CMS Collaboration, et al. “Measurement of b Hadron Lifetimes in Pp Collisions at √s =8 TeV.” The European Physical Journal C, vol. 78, no. 6, June 2018. © 2018 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
Measurements are presented of the lifetimes of the B[superscript 0], B[superscript 0][subscript s], Λ[superscript 0][subscript b], and B[superscript +][superscript c] hadrons using the decay channels B[superscript 0]→J/ψK[superscript ∗](892)[superscript 0], B[superscript 0]→J/ψK[superscript 0][subscript S], B[superscript 0][subscript s]→J/ψπ[superscript +]π[superscript −], B[superscript 0][subscript s]→J/ψϕ(1020), Λ[superscript 0][subscript b]→J/ψΛ[superscript 0], and B[superscript +][subscript c]→J/ψπ[superscript +]. The data sample, corresponding to an integrated luminosity of 19.7 fb[superscript -1], was collected by the CMS detector at the LHC in proton–proton collisions at √s = 8TeV. The B[superscript 0] lifetime is measured to be 453.0±1.6(stat) ± 1.8(syst)μm in J/ψK[superscript ∗](892)[superscript 0] and 457.8±2.7(stat)±2.8(syst)μm in J/ψK[superscript 0][subscript S], which results in a combined measurement of cτ[subscript B[superscript]]=454.1±1.4(stat)±1.7(syst)μm. The effective lifetime of the B[superscript 0][subscript s] 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: cτ[subscript B[superscript 0][subscript s]]→J/ψπ[superscript +]π[superscript −]=502.7±10.2(stat)±3.4(syst)μm and cτ[subscript B[superscript 0][subscript s]]→J/ψϕ(1020)=443.9±2.0(stat)±1.5(syst)μm . The Λ[superscript 0][subscript b]] 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[superscript +][subscript c] lifetime, measured with respect to the B[superscript +] to reduce the systematic uncertainty, is 162.3±7.8(stat)±4.2(syst)±0.1(τ[subscript B[superscript +]])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
