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Measurement of the top quark pole mass using $\text{t}\overline{\text{t}}\text{+jet}$ events in the dilepton final state at $\sqrt{s}=$ 13 TeV

A measurement of the top quark pole mass $m_{\text{t}}^{\text{pole}}$ in events where a top quark-antiquark pair ($\text{t}\overline{\text{t}}$) is produced in association with one additional jet ($\text{t}\overline{\text{t}}$+jet) is presented. This analysis is performed using proton-proton collisi...

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Detalles Bibliográficos
Autor principal: CMS Collaboration
Publicado: 2022
Materias:
Acceso en línea:http://cds.cern.ch/record/2804936
Descripción
Sumario:A measurement of the top quark pole mass $m_{\text{t}}^{\text{pole}}$ in events where a top quark-antiquark pair ($\text{t}\overline{\text{t}}$) is produced in association with one additional jet ($\text{t}\overline{\text{t}}$+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 36.3fb$^{-1}$. Events with two opposite charge leptons in the final state ($\text{e}^{+}\text{e}^{-}$, $\mu^{+}\mu^{-}$, $\text{e}^{\pm}\mu^{\mp}$) are analyzed. Using multivariate analysis techniques based on machine learning, the reconstruction of the main observable and the event selection are optimized. The production cross section is measured as a function of the inverse invariant mass of the $\text{t}\overline{\text{t}}$+jet system at the parton level, using a maximum likelihood unfolding. The top quark pole mass is extracted using the theory predictions at next-to-leading order, resulting in $m_{\text{t}}^{\text{pole}}=172.94\pm1.37$ GeV when using the ABMP16NLO parton distribution functions.