Quark content of f0(980)_from the decay ratios into ππ, K(K)over-bar and γγ

The quark content of the meson f(0)(980) is determined on the basis of coupling constants of the decays f(0)(980) --> pi pi, K (K) over bar and gamma gamma. The combined analysis has been carried out with the Flatte formula for the ratio of coupling constants g(K (K) over bar)g(pi pi) found by fitting to data for the decays f(0)(980) --> pi pi, K (K) over bar and transition form factor f(0)(980) --> q (q) over bar --> gamma gamma, which is determined from the data on gamma gamma partial width. For the flavour wave function of f(0)(980) written as n (n) over bar cos phi + s (s) over bar sin phi, two solutions appear: 1) phi similar or equal to 55 degrees and 2) phi = -43 degrees. (C) 2000 Published by Elsevier Science B.V. All rights reserved.