A measurement of the top quark pole mass m(t)(pole) in events where a top quark-antiquark pair (t-tbar) is produced in association with at least one additional jet (t-tbar+jet) is presented. This analysis is performed using proton-proton collision data at root √s = 13TeV 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(+/-) mu(-/+)) 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 t-tbar+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(t)(pole) = 172.93 +/- 1.36 GeV.
Measurement of the top quark pole mass using t t̅ + jet events in the dilepton final state in proton-proton collisions at √s = 13 TeV
Calligaris, L.;Aimè, C.;Asenov, P.;Bianchini, L.;Ciocci, M. A.;Donato, S.;Messineo, A.;Musich, M.;Rizzi, A.;Cipriani, M.;Marini, A. C.;
2023-01-01
Abstract
A measurement of the top quark pole mass m(t)(pole) in events where a top quark-antiquark pair (t-tbar) is produced in association with at least one additional jet (t-tbar+jet) is presented. This analysis is performed using proton-proton collision data at root √s = 13TeV 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(+/-) mu(-/+)) 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 t-tbar+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(t)(pole) = 172.93 +/- 1.36 GeV.File | Dimensione | Formato | |
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JHEP07(2023)077.pdf
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