Measurement of prompt photon production in √SNN = 8.16 TeV p + Pb collisions with ATLAS
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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.
Bibliographical metadata
Original language | English |
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Pages (from-to) | 96-116 |
Number of pages | 20 |
Journal | Physics Letters B |
Volume | 788 |
Early online date | 17 Jul 2019 |
DOIs | |
Publication status | Published - 10 Sep 2019 |