Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Evidence for narrow resonant structures at $W \approx 1.68$ and $W
  \approx 1.72$ GeV in real Compton scattering off the proton   First measurement of the beam asymmetry $\Sigma$ for Compton scattering off
the proton in the energy range $E_{\gamma}=0.85 - 1.25$ GeV is presented. The
data reveals two narrow structures at $E_{\gamma}= 1.036$ and
$E_{\gamma}=1.119$ GeV. They may signal narrow resonances with masses near
$1.68$ and $1.72$ GeV, or they may be generated by the sub-threshold $K\Lambda$
and $\omega p$ production. Their decisive identification requires additional
theoretical and experimental efforts.

13
The categories of this paper are: quant-ph
9
The categories of this paper are: nlin
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
19
The categories of this paper are: eess
10
The categories of this paper are: q-bio
32
The categories of this paper are: atom-ph
35
The categories of this paper are: mtrl-th
21
The categories of this paper are: adap-org
28
The categories of this paper are: alg-geom
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
20
The categories of this paper are: acc-phys