Measurement of Heavy Flavor Properties at CMS

Measurements of lifetimes in the decay channels B0 → J/ψ K*(892)0, B0 → J/ψ Ks0,B0s→J/ψπ+π−, Bs0→J/ψφ,Λ0b→J/ψΛ0 and Bc+ → J/ψπ+, and polarization of Λb in Λb → J/ψΛ decays are presented. The data used are collected by the CMS experiment in proton–proton collisions at centre-of-mass energys = 7 and 8 TeV corresponding to an integrated luminosity of 5 fb−1 and 19.7 fb−1, respectively. The measured lifetimes in µmarecτB0→J/ψ K∗ (892)0 = 453.0 ± 1.6(stat) ± 1.8(syst), cτB0→J/ψ Ks0 = 457.8 ± 2.7(stat) ± 2.8(syst), cτB0s →J/ψφ = 443.9 ± 2.0(stat) ± 1.5(syst), cτB0s →J/ψπ+π − = 502.7 ± 10.2(stat) ± 3.4(syst), cτΛ0 b→J/ψΛ= 442.9 ± 8.2(stat)± 2.8(syst)andcτ0 Bc+→J/ψπ= 162.3 ± + 7.8(stat) ± 4.2(syst). The measured Λ0b polarization is P = 0.00 ± 0.06(stat) ± 0.06(syst) along with the asymmetry parameter α1 = 0.14 ± 0.14(stat) ± 0.10(syst).