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The mass of the top quark is measured in 36.3 fb$^{-1}$ of LHC proton-protoncollision data collected with the CMS detector at $\sqrt{s}$ = 13 TeV. Themeasurement uses a sample of top quark pair candidate events containing oneisolated electron or muon and at least four jets in the final state. For eachevent, the mass is reconstructed from a kinematic fit of the decay products toa top quark pair hypothesis. A profile likelihood method is applied using up tofour observables to extract the top quark mass. The top quark mass is measuredto be 171.77 $\pm$ 0.37 GeV. This approach significantly improves the precisionover previous measurements.

cornell university

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 TeV