Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoproduction of the $f_2(1270)$ meson using the CLAS detector   The quark structure of the $f_2(1270)$ meson has, for many years, been
assumed to be a pure quark-antiquark ($q\bar{q}$) resonance with quantum
numbers $J^{PC} = 2^{++}$. Recently, it was proposed that the $f_2(1270)$ is a
molecular state made from the attractive interaction of two $\rho$-mesons. Such
a state would be expected to decay strongly to final states with charged pions,
due to the dominant decay $\rho \to \pi^+ \pi^-$, whereas decay to two neutral
pions would likely be suppressed. Here, we measure for the first time the
reaction $\gamma p \to \pi^0 \pi^0 p$, using the CLAS detector at Jefferson Lab
for incident beam energies between 3.6-5.4~GeV. Differential cross sections,
$d\sigma / dt$, for $f_2(1270)$ photoproduction are extracted with good
precision, due to low backgrounds, and are compared with theoretical
calculations.

19
The categories of this paper are: eess
7
The categories of this paper are: hep-th
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
27
The categories of this paper are: comp-gas
36
The categories of this paper are: cmp-lg
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
34
The categories of this paper are: chem-ph
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
16
The categories of this paper are: stat
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
12
The categories of this paper are: nucl-th