Measurement of prompt photon production in TeV p + Pb collisions with ATLAS
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.
- Research Organization:
- Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States); Harvard Univ., Cambridge, MA (United States); Univ. of Colorado, Boulder, CO (United States)
- Sponsoring Organization:
- USDOE National Nuclear Security Administration (NNSA); USDOE Office of Science (SC)
- Contributing Organization:
- The ATLAS Collaboration
- Grant/Contract Number:
- AC52-07NA27344; SC0007881; SC0018117
- OSTI ID:
- 1562596
- Alternate ID(s):
- OSTI ID: 1661037; OSTI ID: 1718928; OSTI ID: 1972618
- Report Number(s):
- LLNL-JRNL-793459; S0370269319304885; PII: S0370269319304885
- Journal Information:
- Physics Letters. B, Journal Name: Physics Letters. B Vol. 796 Journal Issue: C; ISSN 0370-2693
- Publisher:
- ElsevierCopyright Statement
- Country of Publication:
- Netherlands
- Language:
- English
Web of Science
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