Scientific article
Open access

Measurement of prompt photon production in TeV + Pb collisions with ATLAS

ContributorsATLAS Collaboration
Published inPhysics Letters. B, vol. 796, p. 230-252
  • Open Access - SCOAP3
Publication date2019

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.

Citation (ISO format)
ATLAS Collaboration. Measurement of prompt photon production in TeV + Pb collisions with ATLAS. In: Physics Letters. B, 2019, vol. 796, p. 230–252. doi: 10.1016/j.physletb.2019.07.031
Main files (1)
Article (Published version)
ISSN of the journal0370-2693

Technical informations

Creation01/14/2020 8:39:36 AM
First validation01/14/2020 8:39:36 AM
Update time03/15/2023 6:43:58 PM
Status update03/15/2023 6:43:57 PM
Last indexation08/30/2023 10:02:59 PM
All rights reserved by Archive ouverte UNIGE and the University of GenevaunigeBlack