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

Abstract

A measurement of the top quark pole mass $m_{\mathrm{t}}^{\text{pole}}$ in events where a top quark-antiquark pair ($\mathrm{t}\bar{\mathrm{t}}$) is produced in association with at least one additional jet ($\mathrm{t}\bar{\mathrm{t}}$+jet) is presented. 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 with two opposite-sign leptons in the final state (e${}^{+}$e${}^{-}$, ${\mu }^{+}{\mu }^{-}$, e${}^{\pm }{\mu }^{\mp }$) are analyzed. The reconstruction of the main observable and the event classification are optimized using multivariate analysis techniques based on machine learning. The production cross section is measured as a function of the inverse of the invariant mass of the $\mathrm{t}\bar{\mathrm{t}}$+jet system at the parton level using a maximum likelihood unfolding. Given a reference parton distribution function (PDF), the top quark pole mass is extracted using the theoretical predictions at next-to-leading order. For the ABMP16NLO PDF, this results in $m_{\mathrm{t}}^{\text{pole}}$ = 172.93 $\pm$ 1.36 GeV.

arXiv commentReplaced with the published version. Added the journal reference and the DOI. All the figures and tables can be found at http://cms-results.web.cern.ch/cms-results/public-results/publications/TOP-21-008 (CMS Public Pages)

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