Measurement of prompt photon production in $\sqrt{s_\mathrm{NN}} = 8.16$ TeV $p$+Pb collisions with ATLAS - INSPIRE

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Measurement of prompt photon production in $\sqrt{s_\mathrm{NN}} = 8.16$ TeV $p$ +Pb collisions with ATLAS

ATLAS

Collaboration

Mar 6, 2019

37 pages

Published in:

Phys.Lett.B 796 (2019) 230-252

Published: Sep 10, 2019

e-Print:

1903.02209 [nucl-ex]

DOI:

10.1016/j.physletb.2019.07.031 (publication)

Report number:

CERN-EP-2019-002

Experiments:

CERN-LHC-ATLAS

View in:

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Abstract: (Elsevier)

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.

Note:

37 pages in total, author list starting page 21, 9 figures, no tables, final version published in Phys. Lett. B. All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/HION-2018-05/ •
Submitted to Phys.Lett.

parton: distribution function
photon: direct production
photon: transverse energy
parton: energy loss
parton: density
higher-order: 1
p nucleus: scattering
quantum chromodynamics: perturbation theory
ATLAS
inclusive production

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