Measurement of the cross section for isolated-photon plus jet production in ppcollisions at √s=13TeV using the ATLAS detector

Abstract

The dynamics of isolated-photon production in association with a jet in proton–proton collisions at a centre-of-mass energy of 13TeV are studied with the ATLAS detector at the LHC using a dataset with an integrated luminosity of 3.2fb−1. Photons are required to have transverse energies above 125GeV. Jets are identified using the anti-ktalgorithm with radius parameter R =0.4and required to have transverse momenta above 100GeV. Measurements of isolated-photon plus jet cross sections are presented as functions of the leading-photon transverse energy, the leading-jet transverse momentum, the azimuthal angular separation between the photon and the jet, the photon–jet invariant mass and the scattering angle in the photon–jet centre-of-mass system. Tree-level plus parton-shower predictions fromSherpaandPythiaas well as next-to-leading-order QCD predictions fromJetphoxandSherpaare compared to the measurements.