Forward rapidity isolated photon production in proton-nucleus collisions
Ducloué, B., Lappi, T., & Mäntysaari, H. (2019). Forward rapidity isolated photon production in proton-nucleus collisions. Nuclear Physics A, 982, 267-270. https://doi.org/10.1016/j.nuclphysa.2018.10.064
Published inNuclear Physics A
© 2018 Published by Elsevier B.V.
We calculate isolated photon production at forward rapidities in proton-nucleus collisions in the Color Glass Condensate framework. Our calculation uses dipole cross sections solved from the running coupling Balitsky-Kovchegov equation with an initial condition fit to deep inelastic scattering data and extended to nuclei with an optical Glauber procedure that introduces no additional parameters beyond the basic nuclear geometry. We present predictions for future forward RHIC and LHC measurements. The predictions are also compared to updated results for the nuclear modification factors for pion production, Drell-Yan dileptons and J/ψ mesons in the same forward kinematics, consistently calculated in the same theoretical framework. We find that leading order, running coupling high energy evolution in the CGC picture leads to a significant nuclear suppression at forward rapidities. This nuclear suppression is stronger for photons than for pions. We also discuss how this might change with next-to-leading order high energy evolution. ...
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Related funder(s)Academy of Finland; European Commission
Funding program(s)Research costs of Academy Research Fellow, AoF; Research post as Academy Research Fellow, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about fundingThis work has been supported by the Academy of Finland, projects 267321 and 303756, and by the European Research Council, grant ERC-2015-CoG-681707. The work of B.D. is supported by the Agence Nationale de la Recherche project ANR-16-CE31-0019-01.
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