Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Inclusive Photoproduction of $\eta$ Mesons on Nuclei and the in-medium
  properties of the S$_{11}$ Resonance   A relativistic non-local model for the inclusive photoproduction of $\eta$
mesons from complex nuclei is introduced. The model is based on the dominance
of the S$_{11}$(1535) resonance. We compare the results of our calculations
with the available data on inclusive cross sections for the nuclei C, Al and
Cu. Assuming the resonance propagates freely in the nuclear medium, we find
that the calculated angular distribution and energy dependence of the cross
sections reproduce the data in a reasonable fashion. The present non-local
model allows the inclusion of density dependent mass and width in the
calculations. Including these in the calculations reveals that the presently
available data do not show clear preference for the inclusion of such
modifications of the properties of the S$_{11}$(1535) in the nuclear medium.

13
The categories of this paper are: quant-ph
29
The categories of this paper are: funct-an
18
The categories of this paper are: econ
9
The categories of this paper are: nlin
16
The categories of this paper are: stat
5
The categories of this paper are: gr-qc
8
The categories of this paper are: hep-ex
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
4
The categories of this paper are: cond-mat
25
The categories of this paper are: patt-sol
27
The categories of this paper are: comp-gas
20
The categories of this paper are: acc-phys
37
The categories of this paper are: supr-con