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

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 ? W t = 94 � 10(stat.) ? 22 + 28 (syst.) � 2(lumi.)?pb. The measured value is in good agreement with the SM prediction of ? theory = 71.7�1.8 (scale)� 3.4 (PDF) pb [1].[Figure not available: see fulltext.] . � 2018, The Author(s).