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

TL;DR

This paper reports a precise measurement of the top quark mass using a profile likelihood approach with lepton+jets final states in proton-proton collisions at 13 TeV, based on CMS data, achieving improved accuracy.

Contribution

It introduces a novel profile likelihood method utilizing multiple observables to enhance the precision of top quark mass measurement in proton-proton collisions.

Findings

Top quark mass measured as 171.77 ± 0.37 GeV.

Method significantly improves measurement precision.

Analysis based on 36.3 fb$^{-1}$ of CMS data.

Abstract

The mass of the top quark is measured in 36.3 fb$^{-1}$ of LHC proton-proton collision data collected with the CMS detector at $\sqrt{s}$ = 13 TeV. 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 to extract the top quark mass. The top quark mass is measured to be 171.77 $\pm$ 0.37 GeV. This approach significantly improves the precision over previous measurements.