Measurement of b hadron lifetimes in pp collisions at

Measurements are presented of the lifetimes of the $$ , $$ , $$ , and $$ hadrons using the decay channels $$ , $$ , $$ , $$ , $$ , and $$ . The data sample, corresponding to an integrated luminosity of 19.7 $$ , was collected by the CMS detector at the LHC in proton-proton collisions at $$ . The $$ lifetime is measured to be $$ in $$ and $$ in $$ , which results in a combined measurement of $$ . The effective lifetime of the $$ meson is measured in two decay modes, with contributions from different amounts of the heavy and light eigenstates. This results in two different measured lifetimes: $$ and $$ . The $$ lifetime is found to be $$ . The precision from each of these channels is as good as or better than previous measurements. The $$ lifetime, measured with respect to the $$ to reduce the systematic uncertainty, is $$ . All results are in agreement with current world-average values.