Abstract
The dynamics of isolated-photon production in association with a jet in proton–proton collisions
at a centre-of-mass energy of 13 TeV are studied with the ATLAS detector at the
LHC using a dataset with an integrated luminosity of 3:2 fb1. Photons are required to have
transverse energies above 125 GeV. Jets are identified using the anti-kt algorithm with radius
parameter R = 0:4 and required to have transverse momenta above 100 GeV. 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 from Sherpa
and Pythia as well as next-to-leading-order QCD predictions from Jetphox and Sherpa are
compared to the measurements.
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