Measurement of the inclusive $$ textrm{t}overline{textrm{t}} $$ cross section in final states with at least one lepton and additional jets with 302 pb−1 of pp collisions at $$ sqrt{textrm{s}} $$ = 5.02 TeV | CU Experts

Abstract; ; A measurement of the top quark pair (; ; $$ textrm{t}overline{textrm{t}} $$; ; t; ; t; ¯; ; ; ; ) production cross section in proton-proton collisions at a centre-of-mass energy of 5.02 TeV 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 ; ; $$ 62.5pm 1.6{left(textrm{stat}right)}_{-2.5}^{+2.6}left(textrm{syst}right)pm 1.2left(textrm{lumi}right) $$; ; 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 ; ; $$ {69.5}_{-3.7}^{+3.5} $$; ; ; 69.5; ; −; 3.7; ; ; +; 3.5; ; ; ; ; pb at next-to-next-to-leading order in perturbative quantum chromodynamics.

Hayrapetyan A; Tumasyan A; Adam W; Andrejkovic JW; Bergauer T; Chatterjee S; Damanakis K; Dragicevic M; Hussain PS; Jeitler M

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