$a_0(980)$ photoproduction in the coupled channel model

Abstract

We calculated the coupled channel photoproduction amplitudes of the scalar isovector resononace $a_0(980)$, which include the $\pi \eta$, $K^{+}{K}^{-}$ and $K^0\overline{K^0}$ intermediate states. Based on them we obtained the mass distribution in the $\pi \eta$ channel at photon energy $E_{\gamma }$=7 GeV, corresponding to energy accissible in new JLab experiments CLAS12 and GlueX. We also analyzed the shape of mass distribution as a function of the phase of the background amplitude.

Comments: 5 pages, 3 figures