Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Mass dependence of vector meson photoproduction off protons and nuclei
  within the energy-dependent hot-spot model   We study the photoproduction of vector mesons off proton and off nuclear
targets. We work within the colour dipole model in an approach that includes
subnucleon degrees of freedom, so-called hot spots, whose positions in the
impact-parameter plane change event-by-event. The key feature of our model is
that the number of hot spots depends on the energy of the photon--target
interaction. Predictions are presented for exclusive and dissociative
production of $\rho^{0}$, $\mathrm{J/}\psi$, and $\Upsilon(1S)$ off protons, as
well as for coherent and incoherent photoproduction of $\rho^{0}$ off nuclear
targets, where Xe, Au, and Pb nuclei are considered. We find that the mass
dependence of dissociative production off protons as a function of the energy
of the interaction provides a further handle to search for saturation effects
at HERA, the LHC and future colliders. We also find that the coherent
photonuclear production of $\rho^{0}$ is sensitive to fluctuations in the
subnucleon degrees of freedom at RHIC and LHC energies.

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The categories of this paper are: atom-ph
1
The categories of this paper are: cs
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
8
The categories of this paper are: hep-ex
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
23
The categories of this paper are: solv-int
7
The categories of this paper are: hep-th
25
The categories of this paper are: patt-sol
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The categories of this paper are: alg-geom
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The categories of this paper are: cmp-lg
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The categories of this paper are: ao-sci
20
The categories of this paper are: acc-phys