Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Production of Forward Rapidity Photons in High Energy Heavy Ion
  Collisions   We consider production of prompt photons in high energy gold-gold and
deuteron-gold collisions in the forward rapidity region of RHIC ($y \sim 3.8$).
In this kinematics, the projectile partons typically have large $x_{bj}$ while
the target partons are mostly at very small $x_{bj}$ so that the primary
partonic collisions involve valence quarks from the projectile and gluons from
the target. We take the target nucleus to be a Color Glass Condensate while the
projectile deuteron or nucleus is treated as a dilute system of partons. We
show that the photon production cross section can be written as a convolution
of a quark-nucleus scattering cross section, involving a quark anti-quark
dipole, with the Leading Order quark-photon fragmentation function. We consider
different models of the quark anti-quark dipole and show that measurement of
photons in the forward rapidity region at RHIC can distinguish between
different parameterizations of the dipole cross section as well as help clarify
the role of parton coalescence models in hadron production at RHIC.

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The categories of this paper are: mtrl-th
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The categories of this paper are: cmp-lg
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The categories of this paper are: chao-dyn
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
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The categories of this paper are: physics
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The categories of this paper are: chem-ph
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: dg-ga
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The categories of this paper are: stat
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The categories of this paper are: q-bio
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The categories of this paper are: cs
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The categories of this paper are: math-ph
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The categories of this paper are: atom-ph