Aaboud, M;
Aad, G;
Abbott, B;
Abbott, DC;
Abdinov, O;
Abeloos, B;
Abhayasinghe, DK;
... Arguin, JF; + view all
(2019)
Measurement of prompt photon production in s<inf>NN</inf>=8.16 TeV p + Pb collisions with ATLAS.
Physics Letters B
, 796
pp. 230-252.
10.1016/j.physletb.2019.07.031.
(In press).
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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.
| Type: | Article |
|---|---|
| Title: | Measurement of prompt photon production in s<inf>NN</inf>=8.16 TeV p + Pb collisions with ATLAS |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1016/j.physletb.2019.07.031 |
| Publisher version: | https://doi.org/10.1016/j.physletb.2019.07.031 |
| Language: | English |
| Additional information: | This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/10079510 |
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