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 W t signal is then separated from the tt¯ 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 σW t= 94 ± 10(stat.)− 22+ 28(syst.) ± 2(lumi.) pb. The measured value is in good agreement with the SM prediction of σtheory= 71.7±1.8 (scale)± 3.4 (PDF) pb .[Figure not available: see fulltext.].
Aaboud, M., Aad, G., Abbott, B., Abdallah, J., Abdinov, O., Abeloos, B., et al. (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) [10.1007/JHEP01(2018)063].