Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoproduction of $\eta^\prime$ mesons off nuclei and their properties
  in the nuclear medium   We study the photoproduction of $\eta^\prime$ mesons from nuclei near the
threshold within the collision model based on the nuclear spectral function.
The model takes properly into account both primary photon-nucleon and secondary
pion-nucleon $\eta^\prime$ production processes as well as the effect of the
nuclear $\eta^\prime$ mean-field potential on these processes. We find that the
secondary pion-induced reaction channel ${\pi}N \to {\eta^\prime}N$ plays an
insignificant role in the $\eta^\prime$ photoproduction off nuclei. We
calculate the transparency ratio for $eta^\prime$ mesons and compare it to the
available experimental data. The comparison indicates an inelastic
${\eta^\prime}N$ cross section of the order of 6-10 mb. We show that the
existing transparency ratio measurements do not allow one to distinguish
between two adopted $\eta^\prime$ in-medium modification scenarios. Our studies
also demonstrate that the momentum distribution and excitation function for
$\eta^\prime$ production in ${\gamma}A$ reactions reveal some sensitivity to
these scenarios, which means that such observables may be an important tool to
get a valuable information on the $\eta^\prime$ in-medium properties.

33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con
0
The categories of this paper are: hep-ph
1
The categories of this paper are: cs
17
The categories of this paper are: q-fin
4
The categories of this paper are: cond-mat
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
32
The categories of this paper are: atom-ph
5
The categories of this paper are: gr-qc
21
The categories of this paper are: adap-org
31
The categories of this paper are: ao-sci
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th