Measurements of W+W?+ ? 1 jet production cross-sections in pp collisions at s?s = 13 TeV with the ATLAS detector

Abstract

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 pT > 30 GeV and a pseudorapidity of |?| < 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.