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Measurement of prompt photon production in sNN=8.16 TeV p + Pb collisions with ATLAS

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  • Additional Information
    • Publication Information:
      Elsevier, 2019.
    • Publication Date:
      2019
    • Collection:
      LCC:Physics
    • Abstract:
      The inclusive production rates of isolated, prompt photons in p+Pb collisions at sNN=8.16 TeV are studied with the ATLAS detector at the Large Hadron Collider using a dataset with an integrated luminosity of 165 nb−1 recorded in 2016. The cross-section and nuclear modification factor RpPb are measured as a function of photon transverse energy from 20 GeV to 550 GeV and in three nucleon–nucleon centre-of-mass pseudorapidity regions, (−2.83,−2.02), (−1.84,0.91), and (1.09,1.90). The cross-section and RpPb values are compared with the results of a next-to-leading-order perturbative QCD calculation, with and without nuclear parton distribution function modifications, and with expectations based on a model of the energy loss of partons prior to the hard scattering. The data disfavour a large amount of energy loss and provide new constraints on the parton densities in nuclei.
    • File Description:
      electronic resource
    • ISSN:
      0370-2693
    • Relation:
      http://www.sciencedirect.com/science/article/pii/S0370269319304885; https://doaj.org/toc/0370-2693
    • Accession Number:
      10.1016/j.physletb.2019.07.031
    • Accession Number:
      edsdoj.5296fce8972146bd921de8f979315d64