Measurement of the top quark mass using a profile likelihood approach with the lepton + jets final states in proton–proton collisions at $\sqrt{s}=13\phantom{\rule{0.166667em}{0ex}}\text{Te}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$

The mass of the top quark is measured in 36.3 $\phantom{\rule{0.166667em}{0ex}}{\text{fb}}^{-1}$ of LHC proton–proton collision data collected with the CMS detector at $\sqrt{s}=13\phantom{\rule{0.166667em}{0ex}}\text{Te}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$ . The measurement uses a sample of top quark pair candidate events containing one isolated electron or muon and at least four jets in the final state. For each event, the mass is reconstructed from a kinematic fit of the decay products to a top quark pair hypothesis. A profile likelihood method is applied using up to four observables per event to extract the top quark mass. The top quark mass is measured to be $171.77±0.37\phantom{\rule{0.166667em}{0ex}}\text{Ge}\phantom{\rule{-0.80002pt}{0ex}}\text{V}$ . This approach significantly improves the precision over previous measurements.