Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Geometrical scaling description for the exclusive production of vector
  mesons and deeply virtual Compton scattering   In this work, we investigate the exclusive production of particles in
scattering processes in the so-called saturation region. Within this scheme the
phenomenon of geometric scaling takes place: cross sections are functions only
of a dimensionless combination of the relevant kinematic variables, which
happens both in inclusive and diffractive cases, as in the production of vector
mesons. In particular, the scaling variable is given in general by $\tau =
Q^2/Q_s^2$, where $Q^2$ is the photon virtuality and $Q_s$ represents the
saturation scale, which drives the energy dependence and the corresponding
nuclear effects. Based on the scaling property, we are able to derive a
universal expression for the cross sections for the exclusive vector meson
production and deeply virtual Compton scattering (DVCS) in both photon-proton
and photon-nucleus interactions. This phenomenological result describes all
available data from DESY-HERA for $\rho$, $\phi$ and $J/\psi$ production and
DVCS measurements. A discussion is also carried out on the size of nuclear
shadowing corrections on photon-nucleus interaction.

19
The categories of this paper are: eess
15
The categories of this paper are: nucl-ex
26
The categories of this paper are: bayes-an
17
The categories of this paper are: q-fin
11
The categories of this paper are: hep-lat
9
The categories of this paper are: nlin
25
The categories of this paper are: patt-sol
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
27
The categories of this paper are: comp-gas