��\to��^0����and ��\to��^0��^0��decays and Mixing Between Low and High Mass Scalar Mesons

Radiative decays ��\to����^0��and ��\to��^0��^0��are studied assuming that these decays are caused through the intermediate a_0(980)��and f_0(980)��states, respectively. Fitting the experimental data of the ����^0 and ��^0��^0 invariant mass spectrum in the decays ��\to����^0��and ��^0��^0��, it is shown that the processes ��\to a_0��and ��\to f_0��are dominated by the K^+K^- loop interaction rather than the contact ��a_0(f_0)��one both for the non-derivative and derivative SPP coupling. The experimental data of ��[��\to f_0��]/��[��\to a_0��] predicts that g_{f_0K\bar{K}}/g_{a_0K\bar{K}} \sim 2. Considering the effects of the mixing between low mass scalar qq\bar{q}\bar{q} states and high mass scalar q\bar{q} states to these coupling constants g_{f_0K\bar{K}} and g_{a_0K\bar{K}}, one suggests that the mixing is rather large.
15 pages, 10 figures