Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Damanakis, K.The ATLAS collaboration2024-03-092024-03-0920231434-60441434-6052https://doi.org/10.1140/epjc/s10052-023-12050-4https://hdl.handle.net/20.500.14034/1404The mass of the top quark is measured in 36.3 fb(-1) of LHC proton-proton collision data collected with the CMS detector at root s = 13 TeV. The measurement uses a sample of top quark pair candidate events containing one isolated electron or muon and at least four jets in the final state. For each event, the mass is reconstructed from a kinematic fit of the decay products to a top quark pair hypothesis. A profile likelihood method is applied using up to four observables per event to extract the top quark mass. The top quark mass is measured to be 171.77 +/- 0.37 GeV. This approach significantly improves the precision over previous measurements.eninfo:eu-repo/semantics/openAccessArticle10.1140/epjc/s10052-023-12050-48310N/AWOS:0010933358000012-s2.0-8517491488137906635Q1