Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measuring the Gluon Density in e + A Collisions: KLN CGC, DGLAP Glauber,
  or Neither?   We predict readily experimentally measurable differences in the diffractive
cross section in the coherent exclusive photoproduction of J/psi mesons in e +
A collisions at eRHIC and LHeC energies for nuclear gluon distributions assumed
to 1) evolve in x with DGLAP dynamics and have a spatial distribution
proportional to the Glauber nuclear thickness function and 2) evolve in x and b
according to the KLN prescription of CGC dynamics. We find that CGC physics
predicts that the nuclear gluon density widens significantly as a function of x
yielding diffractive peaks and minima that evolve dramatically with x; on the
other hand the DGLAP Glauber distribution yields peaks and minima constant in
x. We also find that the dipole cross section at the level of two gluon
exchange within the KLN parameterization of the CGC satisfies the black disk
limit whereas this limit is violated when DGLAP evolution is used; the
normalization of the diffractive cross section grows more slowly in x by
several orders of magnitude when using the KLN parameterization as compared to
the result when employing DGLAP evolution.

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The categories of this paper are: math
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
18
The categories of this paper are: econ
33
The categories of this paper are: plasm-ph
3
The categories of this paper are: physics
11
The categories of this paper are: hep-lat
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
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The categories of this paper are: astro-ph
31
The categories of this paper are: ao-sci
15
The categories of this paper are: nucl-ex
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The categories of this paper are: comp-gas
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The categories of this paper are: q-alg