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Measurements of the inclusive and normalised differential cross sections arepresented for the production of single top quarks in association with a W bosonin proton-proton collisions at a centre-of-mass energy of 13 TeV. The data usedwere recorded with the CMS detector at the LHC during 2016-2018, and correspondto an integrated luminosity of 138 fb$^{-1}$. Events containing one electronand one muon in the final state are analysed. For the inclusive measurement, amultivariate discriminant, exploiting the kinematic properties of the events isused to separate the signal from the dominant $\mathrm{t\bar{t}}$ background. Across section of 79.2 $\pm$ 0.9 (stat) $^{+7.7}_{-8.0}$ (syst) $\pm$ 1.2 (lumi)pb is obtained, consistent with the predictions of the standard model. For thedifferential measurements, a fiducial region is defined according to thedetector acceptance, and the requirement of exactly one jet coming from thefragmentation of a bottom quark. The resulting distributions are unfolded toparticle level and agree with the predictions at next-to-leading order inperturbative quantum chromodynamics.

the journal of high energy physics/the journal of high energy physics

Measurement of inclusive and differential cross sections for single top  quark production in association with a W boson in proton-proton collisions at  $\sqrt{s}$ = 13 TeV