arXiv:hep-ph/9904339·v1·High Energy Physics — Phenomenology

Two photon decays of scalar mesons in a covariant quark model

S. Fajfer · D. Horvatic · D. Tadic · S. Zganec

Abstract

Two photon decay widths of the $J^{P} = O^{+}$ scalar mesons $a_{0} (980)$ , $f_{0} (980)$ , $f_{0} (1370)$ and $χ_{c 0}$ are calculated in a covariant model which is characterized by the quark - antiquark structure. Previously such models were used to calculate current form factors. Here a different application is tried. A simple version of the model uses adjusted nonrelativistic model parameters with small quark masses. The results seem to prefer nonideal mixing of $f_{0} (980)$ and $f_{0} (1370)$ . The calculated decay rate of $χ_{c 0}$ agrees with the experimental results.

Comments: 25 pages, 2 figures