Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Light by light scattering at a low energy $e^+e^-$ collider -or- What to
  do while waiting for that rare kaon decay event   Two photon processes are a wonderful by-product of an $e^+e^-$ collider at
any energy. Two photon reactions probe the very structure of matter. A machine
operating below 2 GeV has the potential to reveal the Higgs sector of the
strong interaction -- the scalars with vacuum quantum numbers that reflect
dynamical mass generation from the breakdown of chiral symmetry. One of the
many $e^+e^-$ machines around the globe must have a dedicated $\gamma\gamma$
facility.

6
The categories of this paper are: astro-ph
2
The categories of this paper are: math
10
The categories of this paper are: q-bio
1
The categories of this paper are: cs
34
The categories of this paper are: chem-ph
25
The categories of this paper are: patt-sol
16
The categories of this paper are: stat
35
The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
27
The categories of this paper are: comp-gas
9
The categories of this paper are: nlin
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
23
The categories of this paper are: solv-int
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat