Abstract
A
bstract
Fiducial and differential cross-section measurements of
W
+
W
−
production in association with at least one hadronic jet are presented. These measurements are sensitive to the properties of electroweak-boson self-interactions and provide a test of perturbative quantum chromodynamics and the electroweak theory. The analysis is performed using proton-proton collision data collected at
s
= 13 TeV with the ATLAS experiment, corresponding to an integrated luminosity of 139 fb
−
1
. Events are selected with exactly one oppositely charged electron-muon pair and at least one hadronic jet with a transverse momentum of
p
T
>
30 GeV and a pseudorapidity of |
η
|
<
4
.
5. After subtracting the background contributions and correcting for detector effects, the jet-inclusive
W
+
W
−
+ ≥ 1 jet fiducial cross-section and
W
+
W
−
+ jets differential cross-sections with respect to several kinematic variables are measured. These measurements include leptonic quantities, such as the lepton transverse momenta and the transverse mass of the
W
+
W
−
system, as well as jet-related observables such as the leading jet transverse momentum and the jet multiplicity. Limits on anomalous triple-gauge-boson couplings are obtained in a phase space where interference between the Standard Model amplitude and the anomalous amplitude is enhanced.