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A measurement of the top quark pole mass $m_\mathrm{t}^\text{pole}$ in eventswhere a top quark-antiquark pair ($\mathrm{t\bar{t}}$) is produced inassociation with at least one additional jet ($\mathrm{t\bar{t}}$+jet) ispresented. This analysis is performed using proton-proton collision data at$\sqrt{s}$ = 13 TeV collected by the CMS experiment at the CERN LHC,corresponding to a total integrated luminosity of 36.3 fb$^{-1}$. Events withtwo opposite-sign leptons in the final state (e$^+$e$^-$, $\mu^+\mu^-$,e$^\pm\mu^\mp$) are analyzed. The reconstruction of the main observable and theevent classification are optimized using multivariate analysis techniques basedon machine learning. The production cross section is measured as a function ofthe inverse of the invariant mass of the $\mathrm{t\bar{t}}$+jet system at theparton level using a maximum likelihood unfolding. Given a reference partondistribution function (PDF), the top quark pole mass is extracted using thetheoretical predictions at next-to-leading order. For the ABMP16NLO PDF, thisresults in $m_\mathrm{t}^\text{pole}$ = 172.93 $\pm$ 1.36 GeV.

the journal of high energy physics/the journal of high energy physics

Measurement of the top quark pole mass using $\mathrm{t\bar{t}}$+jet  events in the dilepton final state in proton-proton collisions at $\sqrt{s}$  = 13 TeV