Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Surprises in threshold antikaon-nucleon physics   Low energy \bar{K}N interactions are studied within Unitary Chiral
Perturbation Theory at next-to-leading order with ten coupled channels. We pay
special attention to the recent precise determination of the strong shift and
width of the kaonic hydrogen 1s state by the DEAR Collaboration that has
challenged our theoretical understanding of this sector of strong interactions.
We typically find two classes of solutions, both of them reproducing previous
data, that either can or cannot accommodate the DEAR measurements. The former
class has not been previously discussed.

35
The categories of this paper are: mtrl-th
2
The categories of this paper are: math
7
The categories of this paper are: hep-th
1
The categories of this paper are: cs
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
23
The categories of this paper are: solv-int
16
The categories of this paper are: stat
28
The categories of this paper are: alg-geom
27
The categories of this paper are: comp-gas
3
The categories of this paper are: physics
33
The categories of this paper are: plasm-ph
31
The categories of this paper are: ao-sci
6
The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin