The coupling constants g_{ρπγ} and g_{ωπγ} as derived from QCD sum rules}

Abstract

We employ QCD sum rules to calculate the coupling constants g${}_{\rho \pi \gamma }$ and g${}_{\omega \pi \gamma }$ by studying the three point $\rho \pi \gamma$- and $\omega \pi \gamma$-correlation functions. Our results for the decay widths $\Gamma ({\rho }^0\to {\pi }^0\gamma )$ and $\Gamma (\omega \to {\pi }^0\gamma )$ calculated using the obtained coupling constants are in good agreement with the experimental values of these decay widths.

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