Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Analysis of the strong coupling constant $G_{D_{s}^{*}D_{s}\phi}$ and
  the decay width of $D_{s}^{*}\rightarrow D_{s}\gamma$ with QCD sum rules   In this article, we calculate the form factors and the coupling constant of
the vertex $D_{s}^{*}D_{s}\phi$ using the three-point QCD sum rules. We
consider the contributions of the vacuum condensates up to dimension $7$ in the
operator product expansion(OPE). And all possible off-shell cases are
considered, $\phi$, $D_{s}$ and $D_{s}^{*}$, resulting in three different form
factors. Then we fit the form factors into analytical functions and extrapolate
them into time-like regions, which giving the coupling constant for the
process. Our analysis indicates that the coupling constant for this vertex is
$G_{Ds*Ds\phi}=4.12\pm0.70 GeV^{-1}$. The results of this work are very useful
in the other phenomenological analysis. As an application, we calculate the
coupling constant for the decay channel $D_{s}^{*}\rightarrow D_{s}\gamma$ and
analyze the width of this decay with the assumption of the vector meson
dominance of the intermediate $\phi(1020)$. Our final result about the decay
width of this decay channel is $\Gamma=0.59\pm0.15keV$.

23
The categories of this paper are: solv-int
27
The categories of this paper are: comp-gas
16
The categories of this paper are: stat
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
36
The categories of this paper are: cmp-lg
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
24
The categories of this paper are: dg-ga
14
The categories of this paper are: math-ph
30
The categories of this paper are: q-alg
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
5
The categories of this paper are: gr-qc
15
The categories of this paper are: nucl-ex
17
The categories of this paper are: q-fin