Measurement of the cross section of top quark-antiquark pair production in association with a W boson in proton-proton collisions at √s = 13 TeV

Abstract

Abstract

The production of a top quark-antiquark pair in association with a W boson (

t

t ¯

W

$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$ ) is measured in proton-proton collisions at a center-of-mass energy of 13 TeV. The analyzed data was recorded by the CMS experiment at the CERN LHC and corresponds to an integrated luminosity of 138 fb−1. Events with two or three leptons (electrons and muons) and additional jets are selected. In events with two leptons, a multiclass neural network is used to distinguish between the signal and background processes. Events with three leptons are categorized based on the number of jets and of jets originating from b quark hadronization, and the lepton charges. The inclusive

t

t ¯

W

$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$ production cross section in the full phase space is measured to be 868 ± 40(stat) ± 51(syst) fb. The

t

t ¯

W

$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$ + and

t

t ¯

W

$$ \textrm{t}\overline{\textrm{t}}\textrm{W} $$ − cross sections are also measured as 553 ± 30(stat) ± 30(syst) and 343 ± 26(stat) ± 25(syst) fb, respectively, and the corresponding ratio of the two cross sections is found to be

1.61 ± 0.15

stat

− 0.05

+ 0.07

syst

$$ 1.61\pm 0.15{\left(\textrm{stat}\right)}_{-0.05}^{+0.07}\left(\textrm{syst}\right) $$ . The measured cross sections are larger than but consistent with the standard model predictions within two standard deviations, and represent the most precise measurement of these cross sections to date.