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Scientific article
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Inclusive-photon production and its dependence on photon isolation in pp collisions at \sqrt s=13 TeV using 139 fb-1 of ATLAS data

ContributorsATLAS Collaboration
Published inThe journal of high energy physics, vol. 2023, no. 7, 86
Publication date2023
First online date2023-07-11
Abstract

Measurements of differential cross sections are presented for inclusive isolated-photon production in pp collisions at a centre-of-mass energy of 13 TeV provided by the LHC and using 139 fb$^{−1}$ of data recorded by the ATLAS experiment. The cross sections are measured as functions of the photon transverse energy in different regions of photon pseudorapidity. The photons are required to be isolated by means of a fixed-cone method with two different cone radii. The dependence of the inclusive-photon production on the photon isolation is investigated by measuring the fiducial cross sections as functions of the isolation-cone radius and the ratios of the differential cross sections with different radii in different regions of photon pseudorapidity. The results presented in this paper constitute an improvement with respect to those published by ATLAS earlier: the measurements are provided for different isolation radii and with a more granular segmentation in photon pseudorapidity that can be exploited in improving the determination of the proton parton distribution functions. These improvements provide a more in-depth test of the theoretical predictions. Next-to-leading-order QCD predictions from JETPHOX and SHERPA and next-to-next-to-leading-order QCD predictions from NNLOJET are compared to the measurements, using several parameterisations of the proton parton distribution functions. The measured cross sections are well described by the fixed-order QCD predictions within the experimental and theoretical uncertainties in most of the investigated phase-space region.

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Keywords
  • Hadron-Hadron Scattering
  • P p: colliding beams
  • Photon: inclusive production
  • Parton: distribution function
  • Photon: rapidity
  • P p: scattering
  • Perturbation theory: higher-order
  • Higher-order: 1
  • Differential cross section: measured
  • Rapidity dependence
  • Energy dependence
  • Differential cross section: ratio
  • Higher-order: 2
  • Photon: transverse energy
  • ATLAS
  • Quantum chromodynamics: perturbation theory
  • CERN LHC Coll
  • Phase space
  • Numerical calculations: Monte Carlo
  • Experimental results
  • 13000 GeV-cms
Citation (ISO format)
ATLAS Collaboration. Inclusive-photon production and its dependence on photon isolation in <i>pp </i>collisions at <i>\sqrt s=13 </i>TeV using 139 fb<sup><i>-1 </i></sup>of ATLAS data. In: The journal of high energy physics, 2023, vol. 2023, n° 7, p. 86. doi: 10.1007/jhep07(2023)086
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ISSN of the journal1029-8479
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