Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Test of FSR in the process $e^+e^-\to\pi^+\pi^-\gamma$ at DA$\Phi$NE   In this paper we consider the possibility to test the FSR model in the
reaction $e^+e^-\to\pi^+\pi^-\gamma$ at DA$\Phi$NE. We propose to consider the
low $Q^2$ region ($Q^2$ is the invariant mass squared of the di-pion system) to
study the different models describing $gamma^*\to\pi^+\pi^-\gamma$ interaction.
As illustration we compare the scalar QED and Resonance Perturbation Theory
prediction for the $e^+e^-\to\pi^+\pi^-\gamma$ cross section. We also consider
the contribution coming from the $\phi$ direct decay
($\phi\to\pi^+\pi^-\gamma$). We find the low $Q^2$ region is sensitive to FSR
models.

29
The categories of this paper are: funct-an
28
The categories of this paper are: alg-geom
30
The categories of this paper are: q-alg
20
The categories of this paper are: acc-phys
24
The categories of this paper are: dg-ga
34
The categories of this paper are: chem-ph
19
The categories of this paper are: eess
36
The categories of this paper are: cmp-lg
16
The categories of this paper are: stat
3
The categories of this paper are: physics
32
The categories of this paper are: atom-ph
8
The categories of this paper are: hep-ex
9
The categories of this paper are: nlin
10
The categories of this paper are: q-bio
17
The categories of this paper are: q-fin
25
The categories of this paper are: patt-sol