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 fb−1. 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.
Highlights
The production of prompt photons in association with at least one jet in proton–proton collisions provides a testing ground for perturbative QCD
The results presented here include a study of the kinematics of the photon plus one-jet system via measurements of the cross sections as functions of the leading-photon transverse energy and the leading-jet transverse momentum
The fiducial cross sections predicted by NLO QCD Jetphox using the MMHT2014 (NNPDF3.0) parton distribution functions (PDF) set are σJetphox
Summary
The production of prompt photons in association with at least one jet in proton–proton (pp) collisions provides a testing ground for perturbative QCD (pQCD). The dominant source in pp collisions at the LHC is the qg → qγ process. Precise measurements of these processes validate the generators used for background studies in searches for physics beyond the Standard Model which involve photons, such as the search for new phenomena in final states with a photon and a jet [3,4]. DateTshewditihst|rηibγu|t
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