Measurement of the inclusive t(t)over-bar cross section in final states with at least one lepton and additional jets with 302 pb-1 of pp collisions at √s=5.02 TeV

Abstract

A 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.