The coupling constant g${}_{\rho \sigma \gamma }$ as derived from QCD sum rules

Abstract

We employ QCD sum rules to calculate the coupling constant g${}_{\rho \sigma \gamma }$ by studying the three point $\rho \sigma \gamma$-correlation function. Our results is consistent with the value of this coupling constant obtained using vector meson dominance of the electromagnetic current and the experimental ${\rho }^0$-photoproduction data.

Comments: 10 pages RevTex, 3 postscript figures