Proposed search for a(0)(0)(980)-f(0)(980) mixing in polarization phenomena

The K+ and K0 meson mass difference induces the mixing of the a(0)(0)(980) and f(0)(980) resonances, the amplitude of which, between the K+K- and K0(-)K(0) thresholds, is large in magnitude, of the order of m(K)m(2)(K0)sqrt[-m(2)(K+)] approximately sqrt[alpha] m(2)(K), and possesses the phase sharply varying by about 90 degrees. We suggest performing the polarized target experiments on the reaction pi(-)p-->etapi(0)n at high energy in which the fact of the existence of a(0)(0)(980)-f(0)(980) mixing can be unambiguously and very easily established through the presence of a strong jump in the azimuthal asymmetry of the etapi(0) S wave production cross section near the K(-)K thresholds. The presented estimates of the polarization effect to be expected in experiment are to a great extent model independent.