Measurement of the top quark mass using proton - proton data at ffiffi ð p s Þ 1⁄4 7 and 8 TeV

A new set of measurements of the top quark mass are presented, based on the proton-proton data recorded by the CMS experiment at the LHC at ffiffi s p 1⁄4 8 TeV corresponding to a luminosity of 19.7 fb−1. The top quark mass is measured using the leptonþ jets, all-jets and dilepton decay channels, giving values of 172.35 0.16ðstatÞ 0.48ðsystÞ GeV, 172.32 0.25ðstatÞ 0.59ðsystÞ GeV, and 172.82 0.19ðstatÞ 1.22ðsystÞ GeV, respectively. When combined with the published CMS results at ffiffi s p 1⁄4 7 TeV, they provide a top quark mass measurement of 172.44 0.13ðstatÞ 0.47ðsystÞ GeV. The top quark mass is also studied as a function of the event kinematical properties in the leptonþ jets decay channel. No indications of a kinematic bias are observed and the collision data are consistent with a range of predictions from current theoretical models of tt̄ production.