• Open Access

Measurement of Bs0 and Ds Meson Lifetimes

R. Aaij et al. (LHCb Collaboration)
Phys. Rev. Lett. 119, 101801 – Published 8 September 2017

Abstract

We report on a measurement of the flavor-specific Bs0 lifetime and of the Ds lifetime using proton-proton collisions at center-of-mass energies of 7 and 8 TeV, collected by the LHCb experiment and corresponding to 3.0fb1 of integrated luminosity. Approximately 407 000 Bs0Ds(*)μ+νμ decays are partially reconstructed in the K+Kπμ+ final state. The Bs0 and Ds natural widths are determined using, as a reference, kinematically similar B0D(*)μ+νμ decays reconstructed in the same final state. The resulting differences between widths of Bs0 and B0 mesons and of Ds and D mesons are ΔΓ(B)=0.0115±0.0053(stat)±0.0041(syst)ps1 and ΔΓ(D)=1.0131±0.0117(stat)±0.0065(syst)ps1, respectively. Combined with the known B0 and D lifetimes, these yield the flavor-specific Bs0 lifetime, τBs0fs=1.547±0.013(stat)±0.010(syst)±0.004(τB)ps and the Ds lifetime, τDs=0.5064±0.0030(stat)±0.0017(syst)±0.0017(τD)ps. The last uncertainties originate from the limited knowledge of the B0 and D lifetimes. The results improve upon current determinations.

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  • Received 10 May 2017

DOI:https://doi.org/10.1103/PhysRevLett.119.101801

Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI.

© 2017 CERN, for the LHCb Collaboration

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Vol. 119, Iss. 10 — 8 September 2017

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