We report on a measurement of the flavor-specific B0s 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 3.0 fb^−1 of integrated luminosity. Approximately 407000 B0s → Ds(*)− μ+ ν_μ decays are partially reconstructed in the K+ K− π− μ+ final state. The B0s and Ds− natural widths are determined using, as a reference, kinematically similar B0 → D(*)− μ+ ν_μ decays reconstructed in the same final state. The resulting differences between widths of B0s and B0 mesons and of Ds− 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, τ_B0s^fs = 1.547 ± 0.013 (stat) ± 0.010 (syst) ± 0.004 (τ_B) ps and the Ds− lifetime, τ_Ds− = 0.5064 ± 0.0030 (stat) ± 0.0017 (syst) ± 0.0017 (τ_D) ps. The last uncertainties originate from the limited knowledge of the B0 and D− lifetimes. The results improve upon current determinations.

Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Measurement of B0s and Ds− Meson Lifetimes. PHYSICAL REVIEW LETTERS, 119(10), 1-10 [10.1103/PhysRevLett.119.101801].

Measurement of B0s and Ds− Meson Lifetimes

BETTI, FEDERICO;Capriotti, L.;CARBONE, ANGELO;FERRARI, FABIO;GALLI, DOMENICO;MUSSINI, MANUEL;PATRIGNANI, CLAUDIA;PERAZZINI, STEFANO;VAGNONI, VINCENZO MARIA;ZUCCHELLI, STEFANO
2017

Abstract

We report on a measurement of the flavor-specific B0s 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 3.0 fb^−1 of integrated luminosity. Approximately 407000 B0s → Ds(*)− μ+ ν_μ decays are partially reconstructed in the K+ K− π− μ+ final state. The B0s and Ds− natural widths are determined using, as a reference, kinematically similar B0 → D(*)− μ+ ν_μ decays reconstructed in the same final state. The resulting differences between widths of B0s and B0 mesons and of Ds− 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, τ_B0s^fs = 1.547 ± 0.013 (stat) ± 0.010 (syst) ± 0.004 (τ_B) ps and the Ds− lifetime, τ_Ds− = 0.5064 ± 0.0030 (stat) ± 0.0017 (syst) ± 0.0017 (τ_D) ps. The last uncertainties originate from the limited knowledge of the B0 and D− lifetimes. The results improve upon current determinations.
2017
Aaij, R., Adeva, B., Adinolfi, M., Ajaltouni, Z., Akar, S., Albrecht, J., et al. (2017). Measurement of B0s and Ds− Meson Lifetimes. PHYSICAL REVIEW LETTERS, 119(10), 1-10 [10.1103/PhysRevLett.119.101801].
Aaij, R.; Adeva, B.; Adinolfi, M.; Ajaltouni, Z.; Akar, S.; Albrecht, J.; Alessio, F.; Alexander, M.; Ali, S.; Alkhazov, G.; Alvarez Cartelle, P.; Alv...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/609999
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