Measurement of prompt photon production in root s(NN)=8.16 TeV p Pb collisions with ATLAS
Delitzsch, C M
Johns, K A
Rutherfoord, J P
Varnes, E W
AffiliationUniv Arizona, Dept Phys
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CitationAaboud, M., Aad, G., Abbott, B., Abbott, D. C., Abdinov, O., Abhayasinghe, D. K., ... & Abreu, H. (2019). Measurement of prompt photon production in sNN= 8.16 TeV p+ Pb collisions with ATLAS. Physics Letters B, 796, 230-252.
JournalPHYSICS LETTERS B
RightsCopyright © 2019 The Author. Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.
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AbstractThe inclusive production rates of isolated, prompt photons in p Pb collisions at root s(NN) = 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 R-p pb 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 R-p pb 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. (C) 2019 The Author. Published by Elsevier B.V.
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