Measurement of b hadron lifetimes in pp collisions at $$\sqrt{s} = 8$$ s = 8 $$\,\text {Te}\text {V}$$ TeV

Abstract Measurements are presented of the lifetimes of the $${\mathrm {B}^0}$$ B0 , $$\mathrm {B}^0_\mathrm {s}$$ Bs0 , $$\mathrm {\Lambda }_\mathrm {b} ^0$$ Λb0 , and $$\mathrm {B}_\mathrm {c}^+$$ Bc+ hadrons using the decay channels $${\mathrm {B}^0}\!\rightarrow \! \mathrm {J}/\psi \mathrm {K^{*}(892)}{}^{0}$$ B0→J/ψK∗(892)0 , $${\mathrm {B}^0}\!\rightarrow \! \mathrm {J}/\psi \mathrm {K^0_S}$$ B0→J/ψKS0 , $$\mathrm {B}^0_\mathrm {s} \!\rightarrow \! \mathrm {J}/\psi \mathrm {\pi ^+}\mathrm {\pi ^-}$$ Bs0→J/ψπ+π- , $$\mathrm {B}^0_\mathrm {s} \!\rightarrow \! \mathrm {J}/\psi \mathrm {\phi (1020)}$$ Bs0→J/ψϕ(1020) , $$\varLambda _\mathrm {b}^0\!\rightarrow \!\mathrm {J}/\psi \mathrm {\Lambda }^{0}$$ Λb0→J/ψΛ0 , and $$\mathrm {B}_\mathrm {c}^+ \!\rightarrow \!\mathrm {J}/\psi \mathrm {\pi ^+}$$ Bc+→J/ψπ+ . The data sample, corresponding to an integrated luminosity of 19.7$$\,\text {fb}^\text {-1}$$ fb-1 , was collected by the CMS detector at the LHC in proton–proton collisions at $$\sqrt{s}=8\,\text {Te}\text {V} $$ s=8TeV . The $${\mathrm {B}^0}$$ B0 lifetime is measured to be $$453.0 \pm 1.6\,\text {(stat)} \pm 1.8\,\text {(syst)} \,\upmu \text {m} $$ 453.0±1.6(stat)±1.8(syst)μm in $$\mathrm {J}/\psi \mathrm {K^{*}(892)}{}^{0}$$ J/ψK∗(892)0 and $$457.8 \pm 2.7\,\text {(stat)} \pm 2.8\,\text {(syst)} \,\upmu \text {m} $$ 457.8±2.7(stat)±2.8(syst)μm in $$ \mathrm {J}/\psi \mathrm {K^0_S}$$ J/ψKS0 , which results in a combined measurement of $$c\tau _{{\mathrm {B}^0}} = 454.1 \pm 1.4\,\text {(stat)} \pm 1.7\,\text {(syst)} \,\upmu \text {m} $$ cτB0=454.1±1.4(stat)±1.7(syst)μm . The effective lifetime of the $$\mathrm {B}^0_\mathrm {s}$$ Bs0 meson is measured in two decay modes, with contributions from different amounts of the heavy and light eigenstates. This results in two different measured lifetimes: $$c\tau _{\mathrm {B}^0_\mathrm {s} \rightarrow \mathrm {J}/\psi \mathrm {\pi ^+}\mathrm {\pi ^-}} = 502.7 \pm 10.2\,\text {(stat)} \pm 3.4\,\text {(syst)} \,\upmu \text {m} $$ cτBs0→J/ψπ+π-=502.7±10.2(stat)±3.4(syst)μm and $$c\tau _{\mathrm {B}^0_\mathrm {s} \rightarrow \mathrm {J}/\psi \mathrm {\phi (1020)}} = 443.9 \pm 2.0\,\text {(stat)} \pm 1.5\,\text {(syst)} \,\upmu \text {m} $$ cτBs0→J/ψϕ(1020)=443.9±2.0(stat)±1.5(syst)μm . The $$\mathrm {\Lambda }_\mathrm {b} ^0$$ Λb0 lifetime is found to be $$442.9 \pm 8.2\,\text {(stat)} \pm 2.8\,\text {(syst)} \,\upmu \text {m} $$ 442.9±8.2(stat)±2.8(syst)μm . The precision from each of these channels is as go