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We consider the two point correlation function of scalar current in QCD sumrules approach to estimate the overlap amplitude of $a_0$ meson. We then employQCD sum rules to calculate the coupling constants g$_{\omega a_0\gamma}$ andg$_{\rho a_0\gamma}$ by studying the three point ${a_0\omega\gamma}$- and${a_0\rho\gamma}$-correlation functions.Comment: 9 pages, 4 figures, RevTe

Coupling constants $g_{a_0\omega\gamma}$ and $g_{a_0\rho\gamma}$ as derived from QCD sum rules