6533b834fe1ef96bd129d87c
RESEARCH PRODUCT
Forward rapidity isolated photon production in proton-nucleus collisions
Tuomas LappiTuomas LappiB. DuclouéHeikki Mäntysaarisubject
Drell-Yan processPhotongeometryProtonNuclear TheoryNuclear Theorypi: productionhiukkasfysiikka01 natural sciencesColor-glass condensateHigh Energy Physics - Phenomenology (hep-ph)coupling constant: energy dependenceopticalNuclear ExperimentBrookhaven RHIC CollPhysicsphoton: productionenergy: highhigher-order: 0higher-order: 1suppressionBalitsky-Kovchegov equationHigh Energy Physics - PhenomenologyCERN LHC CollkinematicsNuclear and High Energy PhysicsMeson[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]FOS: Physical sciencesGlaubermeson114 Physical sciencesdileptonNuclear physicsNuclear Theory (nucl-th)Piondeep inelastic scattering0103 physical sciencesRapidityproton-nucleus collisions010306 general physicsta114010308 nuclear & particles physicsnucleusphoton productionDeep inelastic scatteringboundary condition* Automatic Keywords *rapidity[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]color glass condensatecross section: dipolep nucleusGlauberdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2018-05-14 |