Running of the top quark mass from proton-proton collisions at $\sqrt{s}=$ 13 TeV

Abstract

The running of the top quark mass is experimentally investigated for the first time. The mass of the top quark in the modified minimal subtraction ($\overline{\mathrm{MS}}$) renormalization scheme is extracted from a comparison of the differential top quark-antiquark ($\mathrm{t}\overline{\mathrm{t}}$) cross section as a function of the invariant mass of the $\mathrm{t}\overline{\mathrm{t}}$ system to next-to-leading-order theoretical predictions. The differential cross section is determined at the parton level by means of a maximum-likelihood fit to distributions of final-state observables. The analysis is performed using $\mathrm{t}\overline{\mathrm{t}}$ candidate events in the e${}^{\pm }{\mu }^{\mp }$ channel in proton-proton collision data at a centre-of-mass energy of 13 TeV recorded by the CMS detector at the CERN LHC in 2016, corresponding to an integrated luminosity of 35.9 fb${}^{-1}$. The extracted running is found to be compatible with the scale dependence predicted by the corresponding renormalization group equation. In this analysis, the running is probed up to a scale of the order of 1 TeV.

Replaced with the published version. Added the journal reference. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-19-007 (CMS Public Pages)

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