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. For comparison, we also update the results for the nuclear modification factor for pion production in the same kinematics. We present predictions for future forward RHIC and LHC measurements at $\sqrt{s_{NN}}=200$ GeV and $\sqrt{s_{NN}}=8$ TeV.
Highlights
Interpreting ultrarelativistic heavy ion collision data from the BNL-RHIC and CERN-LHC experiments requires a detailed understanding of the initial stages of the collision process
A large photon momentum can, on the other hand, be balanced by the recoiling quark and correspond to a small intrinsic target kT, with the associated large nuclear suppression. This pattern could change when hadron production is evaluated at next-to-leading order (NLO), where the twoparticle final state kinematics more resembles leading order (LO) photon production
In this work we presented predictions for the nuclear modification factor in forward pion and direct photon production at the RHIC and LHC
Summary
Interpreting ultrarelativistic heavy ion collision data from the BNL-RHIC and CERN-LHC experiments requires a detailed understanding of the initial stages of the collision process. To separately study the initial condition, or the structure of the colliding nuclei at small Bjorken x, the nucleus must be studied with a simpler probe. Measurements of inclusive photon and hadron spectra at forward rapidities (forward being the proton-going direction) are sensitive to the small-x structure of the nucleus.
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