Measurement of the cross-section for producing a W boson in association with a single top quark in pp collisions at √s = 13 TeV with ATLAS

Rimoldi, Marco; Mullier, Geoffrey; Miucci, Antonio; Merlassino, Claudia; Haug, Sigve; Weber, Michael; Meloni, Federico; Beck, Hans Peter; Ereditato, Antonio (2018). Measurement of the cross-section for producing a W boson in association with a single top quark in pp collisions at √s = 13 TeV with ATLAS. Journal of High Energy Physics, 2018(1) Springer 10.1007/JHEP01(2018)063

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The inclusive cross-section for the associated production of a W boson and top quark is measured using data from proton-proton collisions at √s = 13 TeV. The dataset corresponds to an integrated luminosity of 3.2 fb⁻¹, and was collected in 2015 by the ATLAS detector at the Large Hadron Collider at CERN. Events are selected requiring two opposite sign isolated leptons and at least one jet; they are separated into signal and control regions based on their jet multiplicity and the number of jets that are identified as containing b hadrons. The Wt signal is then separated from the tt̅ background using boosted decision tree discriminants in two regions. The cross-section is extracted by fitting templates to the data distributions, and is measured to be ơWt = 94±10 (stat.)+28 -22 (syst.)±2 (lumi.) pb. The measured value is in good agreement with the SM prediction of ơtheory = 71.7±1.8 (scale)±3.4 (PDF) pb [1].

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