Linear Sigma Model predictions for V->Sgamma and S->Vgamma decays

Abstract

The radiative decays $V\to S\gamma$ and $S\to V\gamma$ with $V=\rho ,\omega ,\varphi$ and $S=a_0,\sigma ,f_0$ are calculated within the framework of the Linear Sigma Model. Current experimental data on the $\varphi \to f_0\gamma$ and $\rho \to \sigma \gamma$ branching ratios and the ratio $\Gamma (\varphi \to f_0\gamma )/\Gamma (\varphi \to a_0\gamma )$ are satisfactorily accommodated in our approach. We also estimate the decay widths of the $f_0,a_0\to \rho \gamma ,\omega \gamma$ transitions. All the processes considered are of interest for ongoing experimental programs in Frascati, Jülich and Novosibirsk.

Comments: A comment on vector meson loops added. 2 references added. Typos corrected. Accepted for publication in Physics Letters B