The $g_{Vσγ}$-coupling constants in hadron electrodynamic

Details The $g_{Vσγ}$-coupling constants in hadron electrodynamic The $g_{Vσγ}$-coupling constants in hadron electrodynamic

2003-01-28

arxiv.org/abs/nucl-th/0301089v1

Nucl.Phys. A725 (2003) 116-126

Physics

Nuclear Physics

Nuclear Theory

four figures, twelve pages

Scientific paper

10.1016/S0375-9474(03)01605-1

Recent measurements of the branching ratios for the decays $\omega\to\pi^0\pi^0\gamma$ and $\rho^0\to\pi^0\pi^0\gamma$ lead to coupling constants of the $V\sigma\gamma$-interaction ($V$ is a vector meson) one order of magnitude smaller than previously assumed to describe the threshold cross section of $\gamma+p\to p+\rho^0$ and the HERMES effect. The new $g^2_{V\sigma\gamma}$ couplings are in contradiction with the predictions of the QCD sum rules, but are in good agreement with VDM-estimation of the $\sigma\to \gamma\gamma$-width.

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