Abstract
Abstract:
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 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.)+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 [1].