The gV sigma gamma coupling constants in hadron electrodynamics

Rekalo, MP
Tomasi-Gustafsson, E
Recent measurements of the branching ratios for the decays omega --> pi(0) pi(0)gamma and rho(0) --> pi(0)pi(0)gamma lead to coupling constants of the Vsigmagamma interaction (V is a vector meson) one order of magnitude smaller than previously assumed to describe the threshold cross section of gamma + p --> p + rho(0) and the HERMES effect. The new g(Vsigmagamma)(2) a couplings are in contradiction with the predictions of the QCD sum rules, but are in agreement with vector meson dominance estimation of the sigma --> gammagamma width.


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Citation Formats
M. Rekalo and E. Tomasi-Gustafsson, “The gV sigma gamma coupling constants in hadron electrodynamics,” NUCLEAR PHYSICS A, pp. 116–126, 2003, Accessed: 00, 2020. [Online]. Available: