Coupling constantgρσγas derived from QCD sum rules

A. Gokalp, O. Yilmaz
2001 Physical Review D, Particles and fields  
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.
doi:10.1103/physrevd.64.034012 fatcat:nt73i425szephptckto7djdrcm