Forward rapidity isolated photon production in proton-nucleus collisions

B. Ducloué, T. Lappi, H. Mäntysaari

Research output: Contribution to journalArticleScientificpeer-review

Abstract

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/psi 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.
Original languageEnglish
JournalNuclear Physics, Section A
Volume982
Pages (from-to)267-270
Number of pages4
ISSN0375-9474
DOIs
Publication statusPublished - Feb 2019
MoE publication typeA1 Journal article-refereed
Event27th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter) - Venice, Italy
Duration: 13 May 201819 May 2018

Fields of Science

  • 114 Physical sciences

Cite this

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title = "Forward rapidity isolated photon production in proton-nucleus collisions",
abstract = "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/psi 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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author = "B. Duclou{\'e} and T. Lappi and H. M{\"a}ntysaari",
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Forward rapidity isolated photon production in proton-nucleus collisions. / Ducloué, B.; Lappi, T.; Mäntysaari, H.

In: Nuclear Physics, Section A, Vol. 982, 02.2019, p. 267-270.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Forward rapidity isolated photon production in proton-nucleus collisions

AU - Ducloué, B.

AU - Lappi, T.

AU - Mäntysaari, H.

PY - 2019/2

Y1 - 2019/2

N2 - 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/psi 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.

AB - 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/psi 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.

KW - 114 Physical sciences

U2 - 10.1016/j.nuclphysa.2018.10.064

DO - 10.1016/j.nuclphysa.2018.10.064

M3 - Article

VL - 982

SP - 267

EP - 270

JO - Nuclear Physics, Section A

JF - Nuclear Physics, Section A

SN - 0375-9474

ER -