Measurement of B0s and D−s meson lifetimes

Journal article

We report on a measurement of the flavor-specific B0s lifetime and of the D−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 B0s → D(*)−s μ+νμ decays are partially reconstructed in the K+K−π−μ+ final state. The B0s and D−s natural widths are determined using, as a reference, kinematically similar B0 → D(*)−μ+νμ decays reconstructed in the same final state. The resulting differences between widths of B0s and B0 mesons and of D−s and D− mesons are ΔΓ(B) = −0.0115 ± 0.0053(stat) ± 0.0041(syst) ps^-1 and ΔΓ(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 B0s lifetime, τfsB0s=1.547±0.013(stat)±0.010(syst)±0.004(τB)  ps and the D−s lifetime, τD−s=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.

Authors: Aaij, R; Adeva, B; Adinolfi, M; Evans, T; Gandini, P

• Publication status: Published
• Peer review status: Peer reviewed
• Publisher: American Physical Society
• Journal: Physical Review Letters
• Volume: 119
• Issue: 10
• Pages: 101801
• Publication date: 2017-09-01
• Acceptance date: 2017-07-12
• DOI: 10.1103/PhysRevLett.119.101801
• EISSN: 1079-7114
• ISSN: 0031-9007
• Pmid: 28949189