Measurement of the top quark mass using a profile likelihood approach with the lepton + jets final states in proton–proton collisions at $$\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V} $$ s = 13 Te V

Abstract

The mass of the top quark is measured in 36.3

$$\,\text {fb}^{-1}$$

fb

- 1

of LHC proton–proton collision data collected with the CMS detector at

$$\sqrt{s}=13\,\text {Te}\hspace{-.08em}\text {V} $$

s

= 13

Te

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

$$171.77\pm 0.37\,\text {Ge}\hspace{-.08em}\text {V} $$

171.77 ± 0.37

Ge

V

. This approach significantly improves the precision over previous measurements.