Hayrapetyan, A.Tumasyan, A.Adam, W.Andrejkovic, J. W.Bergauer, T.Chatterjee, S.Damanakis, K.2026-04-252026-04-2520251029-8479https://doi.org/10.1007/JHEP04(2025)099https://hdl.handle.net/11486/8159A measurement of the top quark pair (t (t) over bar over bar) production cross section in proton-proton collisions at a centre-of-mass energy of 5.02TeV is presented. The data were collected at the LHC in autumn 2017, in dedicated runs with low-energy and low-intensity conditions with respect to the default configuration, and correspond to an integrated luminosity of 302 pb(-1). The measurement is performed using events with one electron or muon, and multiple jets, at least one of them being identified as originating from a b quark (b tagged). Events are classified based on the number of all reconstructed jets and of b-tagged jets. Multivariate analysis techniques are used to enhance the separation between the signal and backgrounds. The measured cross section is 62.5 +/- 1.6 (stat)(-2.5)(+2.6) (syst) +/- 1.2 (lumi) pb. A combination with the result in the dilepton channel based on the same data set yields a value of 62.3 +/- 1.5 (stat)+/- 2.4 (syst)+/- 1.2 (lumi) pb, to be compared with the standard model prediction of 69.5(-3.7)(+3.5) pb at next-to-next-to-leading order in perturbative quantum chromodynamics.eninfo:eu-repo/semantics/openAccessHadron-Hadron ScatteringParticle and Resonance ProductionTop PhysicsArticle410.1007/JHEP04(2025)0992-s2.0-105012450925Q1WOS:001617792900001Q10000-0001-7291-19790000-0002-2332-87840000-0001-8443-44600000-0001-8703-69430000-0002-7790-71320000-0003-2150-37500000-0001-9983-1004