A profile likelihood approach to measure the top quark mass in the lepton+jets channel at $\sqrt{s}=13~\mathrm{TeV}$

The mass of the top quark is measured in $36~\mathrm{fb}^{-1}$ of LHC proton-proton collision data collected with the CMS detector at $\sqrt{s}=13~\mathrm{TeV}$. The measurement uses a sample of $\rm{t}\bar{\rm t}$ events containing one isolated muon or electron 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 $\rm{t}\bar{\rm t}$ hypothesis. A profile likelihood method is applied to up to five observables to extract the top quark mass. The impact of systematic uncertainty sources is reduced by including their effect as nuisance parameters in the likelihood. The top quark mass is measured to be $171.77\pm 0.38~\mathrm{GeV}$.