Abstract
Inclusive isolated-photon production in pp collisions at a centre-of-mass energy of 13 TeV is studied with the ATLAS detector at the LHC using a data set with an integrated luminosity of 3.2 fb−1. The cross section is measured as a function of the photon transverse energy above 125 GeV in different regions of photon pseudorapidity. Next-to-leading-order perturbative QCD and Monte Carlo event-generator predictions are compared to the cross-section measurements and provide an adequate description of the data.
Highlights
The production of prompt photons in proton–proton collisions, pp → γ + X, provides a testing ground for perturbative QCD with a hard colourless probe
This paper presents m√easurements of isolated-photon production in pp collisions at s = 13 TeV with the ATLAS detector at the LHC using a data set with an integrated luminosity of 3.2 fb−1 collected during 2015
Since the data are corrected for pile-up and underlying event (UE) effects and the distributions are unfolded to a phase-space definition in which the requirement on at particle level is applied after subtraction of the UE, it is expected that parton-to-hadron corrections to the NLO perturbative QCD (pQCD) predictions are small
Summary
The production of prompt photons in proton–proton (pp) collisions, pp → γ + X, provides a testing ground for perturbative QCD (pQCD) with a hard colourless probe. The extension of the recent next-to-next-to-leading-order (NNLO) pQCD calculations for jet production [5] to prompt-photon production will allow a more stringent test of pQCD To make such a test with small experimental and theoretical uncertainties, it is optimal to perform measurements of prompt-photon production at high photon transverse energies and at the highest possible centre-of-mass energy of the colliding particles. New measurements of prompt-photon production at higher centreof-mass energies are expected to further constrain the gluon density in the proton when combined with previous data. This paper presents m√easurements of isolated-photon production in pp collisions at s = 13 TeV with the ATLAS detector at the LHC using a data set with an integrated luminosity of 3.2 fb−1 collected during 2015 These measurements are performed in a phase-space region ov√erlapping with that used in the previous ATLAS measurement at s = 8 TeV [20]. Next-to-leading-order (NLO) pQCD and MC event-generator predictions are compared to the measurements
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