Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Constraints on color dipole-nucleon cross section from diffractive heavy
  quarkonium production   We study the hard color dipole-nucleon cross section within perturbative QCD
and discuss its relation to observables in diffractive leptoproduction of heavy
quarkonium. The dipole cross section calculated with the unintegrated gluon
density of the nucleon substantially differs from the well-known perturbative
form $\sigma_{dip} \sim b^2$ for $b > 0.3$fm, where $b$ is the transverse
separation of the dipole. We show the measured ratio of $\psi '$ to $J / \psi$
photoproduction cross sections constrains the dipole cross section at
intermediate $b$, and in fact excludes the simple $\sigma_{dip} \sim b^2$
behavior. We also calculate the $t$-slopes of the diffractive $J / \psi, \psi
'$ productions. We emphasize the difference of $t$-slopes, $B_{J/\psi} -
B_{\psi '}$, is dominated by the dipole-nucleon dynamics. This difference is
found to be about $0.3 {GeV}^{-2}$ with our dipole cross section.

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The categories of this paper are: chem-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
2
The categories of this paper are: math
16
The categories of this paper are: stat
1
The categories of this paper are: cs
23
The categories of this paper are: solv-int
14
The categories of this paper are: math-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
20
The categories of this paper are: acc-phys
11
The categories of this paper are: hep-lat
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The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
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The categories of this paper are: comp-gas