Measurement of single top-quark production in association with a $W$ boson in $pp$ collisions at $\sqrt{s}=13$ TeV with the ATLAS detector

Abstract

The inclusive cross-section for the production of a single top quark in association with a $W$ boson is measured using 140 fb${}^{-1}$ of proton-proton collision data collected with the ATLAS detector at $\sqrt{s}=13$ TeV. Events containing two charged leptons and at least one jet identified as originating from a $b$-quark are selected. A multivariate discriminant is constructed to separate the $tW$ signal from the $t\bar{t}$ background. The cross-section is extracted using a profile likelihood fit to the signal and control regions and it is measured to be ${\sigma }_{tW}=75_{-14}^{+15}$ pb, in good agreement with the Standard Model prediction. The measured cross-section is used to extract a value for the left-handed form factor at the $Wtb$ vertex times the CKM matrix element $|f_{\text{LV}}{V}_{tb}|$ of $0.97\pm 0.10$.

45 pages in total, author list starting page 28, 5 figures, 6 tables, published in Phys. Rev. D. All figures including auxiliary figures are available at http://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2018-07

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• Approximate N${}^2$LO and N${}^3$LO QCD Predictions for $tW$ Production
• Inclusive top cross sections in ATLAS