Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Radiative decay of the $X(3872)$ as a mixed molecule-charmonium state in
  effective field theory   Assuming that $X(3872)$ is a mixture between $2P$ charmonium and
$\bar{D}D^{*}$ molecular states with $J^{PC}=1^{++}$, an analysis of $X(3872)$
radiative decays into $J/\psi \gamma$ and $\psi(2S)\gamma$ is presented. The
modification of the radiative branching ratio due to possible constructive or
destructive interferences between the meson-loop and the short-distance contact
term, which is modeled by a charm quark loop, is shown. The model predictions
are shown to be compatible with the experimentally determined ratio of the
mentioned branching fractions for a wide range of the $X(3872)$ charmonium
content. In the case of the destructive interference, a strong restriction on
the charmonium admixture is found.

12
The categories of this paper are: nucl-th
36
The categories of this paper are: cmp-lg
22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
15
The categories of this paper are: nucl-ex
5
The categories of this paper are: gr-qc
33
The categories of this paper are: plasm-ph
20
The categories of this paper are: acc-phys
34
The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
11
The categories of this paper are: hep-lat
29
The categories of this paper are: funct-an
14
The categories of this paper are: math-ph
8
The categories of this paper are: hep-ex
37
The categories of this paper are: supr-con
30
The categories of this paper are: q-alg