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 3.0 fb-1 of integrated luminosity. Approximately 407 000 Bs0âDs(â)-μ+νμ decays are partially reconstructed in the K+K-Ï-μ+ final state. The Bs0 and Ds- natural widths are determined using, as a reference, kinematically similar B0âD(â)-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 ÎÎ(B)=-0.0115±0.0053(stat)±0.0041(syst) ps-1 and ÎÎ(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 Bs0 lifetime, ÏBs0fs=1.547±0.013(stat)±0.010(syst)±0.004(ÏB) ps and the Ds- lifetime, ÏDs-=0.5064±0.0030(stat)±0.0017(syst)±0.0017(ÏD) ps. The last uncertainties originate from the limited knowledge of the B0 and D- lifetimes. The results improve upon current determinations.
Measurement of Bs0 and Ds- Meson Lifetimes
Cardinale, R.;Cavallero, G.;Fontanelli, F.;Petrolini, A.;Sergi, A.;
2017-01-01
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 3.0 fb-1 of integrated luminosity. Approximately 407 000 Bs0âDs(â)-μ+νμ decays are partially reconstructed in the K+K-Ï-μ+ final state. The Bs0 and Ds- natural widths are determined using, as a reference, kinematically similar B0âD(â)-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 ÎÎ(B)=-0.0115±0.0053(stat)±0.0041(syst) ps-1 and ÎÎ(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 Bs0 lifetime, ÏBs0fs=1.547±0.013(stat)±0.010(syst)±0.004(ÏB) ps and the Ds- lifetime, ÏDs-=0.5064±0.0030(stat)±0.0017(syst)±0.0017(ÏD) ps. The last uncertainties originate from the limited knowledge of the B0 and D- lifetimes. The results improve upon current determinations.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.