Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $D^{*}D \rho $ vertex from QCD sum rules   We calculate the form factors and the coupling constant in the $D^{*}D \rho $
vertex in the framework of QCD sum rules. We evaluate the three point
correlation functions of the vertex considering both $ D $ and $ \rho $ mesons
off--shell. The form factors obtained are very different but give the same
coupling constant: $g_{D^{*}D \rho} = 4.1 \pm 0.1$ GeV$^{-1}$.

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The categories of this paper are: patt-sol
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The categories of this paper are: quant-ph
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The categories of this paper are: astro-ph
10
The categories of this paper are: q-bio
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The categories of this paper are: chem-ph
8
The categories of this paper are: hep-ex
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The categories of this paper are: atom-ph
3
The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: econ
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The categories of this paper are: nlin
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The categories of this paper are: adap-org
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The categories of this paper are: mtrl-th
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The categories of this paper are: funct-an
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The categories of this paper are: cond-mat
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The categories of this paper are: acc-phys