Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of the $\Lambda p$ Interaction Close to the $\Sigma^+n$ and
  $\Sigma^0p$ Thresholds   The $\Lambda p$ interaction close to the $\Sigma N$ threshold is considered.
Specifically, the pronounced structure seen in production reactions like $K^-d
\to \pi^- \Lambda p$ and $pp\to K^+ \Lambda p$ around the $\Sigma N$ threshold
is analyzed. Modern interaction models of the coupled $\Lambda N - \Sigma N$
systems generate such a structure either due to the presence of a
(deuteron-like) unstable bound state or of an inelastic virtual state. % A
determination of the position of the prominent peak as observed in various
experiments for the two aforementioned reactions leads to values that agree
quite well with each other. Furthermore, the deduced mean value of $2128.7\pm
0.3$ MeV for the peak position coincides practically with the threshold energy
of the $\Sigma^+ n$ channel. This supports the interpretation of the structure
as a genuine cusp, signaling an inelastic virtual state in the $^3S_1-^3D_1$
partial wave of the $\Sigma N$ isospin 1/2 channel. % There is also evidence
for a second peak (or shoulder) in the data sets considered which appears at
roughly 10-15 MeV above the $\Sigma N$ threshold. However, its concrete
position varies significantly from data set to data set and, thus, a
theoretical interpretation is difficult.

37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
35
The categories of this paper are: mtrl-th
20
The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
23
The categories of this paper are: solv-int
24
The categories of this paper are: dg-ga
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
31
The categories of this paper are: ao-sci
8
The categories of this paper are: hep-ex
33
The categories of this paper are: plasm-ph
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph