Precision lifetime measurements of $\mathrm{b}$ hadrons reconstructed in final states with a $\mathrm{J}/\psi$ meson

We present measurements of the lifetimes of the $\mathrm{B^0}$, $\mathrm{B_{s}^0}$, $\Lambda_{\mathrm{b}}^{0}$, and $\mathrm{B}_\mathrm{c}^{+}$ hadrons using the decay channels $\mathrm{B}^{0}\to \mathrm{J}/\psi \mathrm{K}^{*}(892)^{0}$, $\mathrm{B}^{0}\to \mathrm{J}/\psi \mathrm{K_{S}}$, $\mathrm{B_{s}^0} \to \mathrm{J}/\psi \pi^{+} \pi^{-}$, $\mathrm{B_{s}^0} \to \mathrm{J}/\psi \phi(1020)$, $\Lambda_{\mathrm{b}}^{0} \to \mathrm{J}/\psi \Lambda$, and $\mathrm{B}_\mathrm{c}^{+} \to \mathrm{J}/\psi \pi^{+}$. The data sample, corresponding to $19.7~\mathrm{fb}^{-1}$, was collected from proton-proton collisions at $\sqrt{s}=8~\mathrm{TeV}$ using dedicated triggers to select oppositely charged muons in the $\mathrm{J}/\psi$ mass region. The lifetimes times the speed of light are measured to be \begin{align*} & c\tau_{\mathrm{B}^0} = 453.0 \pm 1.6 \mbox{ (stat) } \pm 1.5 \mbox{ (syst)}~\mu\mbox{m}~(\mbox{in } \mathrm{J}/\psi \mathrm{K}^{*}(892)^{0})\\ & c\tau_{\mathrm{B}^0} = 457.8 \pm 2.7 \mbox{ (stat) } \pm 2.7 \mbox{ (syst)}~\mu\mbox{m}~(\mbox{in } \mathrm{J}/\psi \mathrm{K_{S}})\\ & c\tau_{\mathrm{B_{s}^0}} = 504.3 \pm 10.5 \mbox{ (stat) } \pm 3.7 \mbox{ (syst)}~\mu\mbox{m}~(\mbox{in } \mathrm{J}/\psi \pi^{+} \pi^{-}) \\ & c\tau_{\mathrm{B_{s}^0}} = 443.9 \pm 2.0 \mbox{ (stat) } \pm 1.2 \mbox{ (syst)}~\mu\mbox{m}~(\mbox{in } \mathrm{J}/\psi \phi(1020))\\ & c\tau_{\Lambda_{\mathrm{b}}^{0}} = 443.1 \pm 8.2 \mbox{ (stat) } \pm 2.7 \mbox{ (syst)}~\mu\mbox{m}\\ & c\tau_{\mathrm{B}_\mathrm{c}^{+}} = 162.3 \pm 8.2 \mbox{ (stat)} \pm 4.7 \mbox{ (syst)} \pm 0.1 (\tau_{\mathrm{B}^{+}})~\mu\mbox{m} \end{align*} where the first uncertainty is statistical and the other is systematic. All results are in agreement with the current world average values.