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

Présentation

A measurement of the top quark pole mass $ {m}_{\textrm{t}}^{\textrm{pole}} $ in events where a top quark-antiquark pair ($ \textrm{t}\overline{\textrm{t}} $) is produced in association with at least one additional jet ($ \textrm{t}\overline{\textrm{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$^{−}$, μ$^{+}$μ$^{−}$, e$^{±}$μ$^{∓}$) 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 $ \textrm{t}\overline{\textrm{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}_{\textrm{t}}^{\textrm{pole}} $ = 172.93 ± 1.36 GeV.[graphic not available: see fulltext]