Measurement of B[superscript 0][subscript s] and D[superscript −][subscript s] Meson Lifetimes
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PhysRevLett.119.101801.pdf
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Author(s)
Aaij, R.
Adeva, B.
Adinolfi, M.
Ajaltouni, Z.
Akar, S.
Albrecht, J.
Alessio, F.
Alexander, M.
Ali, S.
Alkhazov, G.
Date Issued
September 2017
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Aaij, R. et al. "Measurement of B[superscript 0][subscript s] and D[superscript −][subscript s] Meson Lifetimes." Physical Review Letters 119, 10 (September 2017): 101801 © 2017 CERN, for the LHCb Collaboration
Version
Final published version
Abstract
We report on a measurement of the flavor-specific B[subscript s]⁰ lifetime and of the D[subscript s]⁻ lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0 fb⁻¹ of integrated luminosity. Approximately 407 000 B[subscript s]⁰→D[subscript s]*⁻μ⁺ν[subscript μ] decays are partially reconstructed in the K⁺K⁻π⁻μ⁺ final state. The B[subscript s]⁰ and D[subscript s]⁻ natural widths are determined using, as a reference, kinematically similar B⁰→D*⁻μ⁺ν[subscript μ] decays reconstructed in the same final state. The resulting differences between widths of B[subscript s]⁰ and B⁰ mesons and of D[subscript s]⁻ and D⁻ mesons are Δ[subscript Γ](B)=-0.0115±0.0053(stat)±0.0041(syst) ps⁻¹ and Δ[subscript Γ](D)=1.0131±0.0117(stat)±0.0065(syst) ps⁻¹, respectively. Combined with the known B⁰ and D⁻ lifetimes, these yield the flavor-specific B[subscript s]⁰ lifetime, τ_B[subscript s]⁰[superscript fs]=1.547±0.013(stat)±0.010(syst)±0.004(τ[subscript B]) ps and the D[subscript s]⁻ lifetime, τ[subscript D][subscript s]⁻=0.5064±0.0030(stat)±0.0017(syst)±0.0017(τ[subscript D) ps. The last uncertainties originate from the limited knowledge of the B⁰ and D⁻ lifetimes. The results improve upon current determinations.
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
http://dx.doi.org/10.1103/PhysRevLett.119.101801
