A SEARCH FOR ANOMALOUS CONTRIBUTION IN E(-)-]PI(0)()E()ETA GAMMA-ANNIHILATION/

Data on e(+)e(-) --> eta/pi(0) collected by the Neutral Detector at No vosibirsk in a c.m. energy range up to 1.04 GeV have been studied with a purpose to single out of the scattering amplitude the triangle anom aly contribution predicted by QCD, PCAC and Chiral Theories. We show t hat the cross section for e(+)e(-) --> pi(0) gamma exhibits no sensiti vity to the pi(0) triangle anomaly; instead, the cross section for e()e(-) --> eta gamma shows a clear sensitivity to the value of the eta triangle anomaly and the best fit corresponds to a value for the eta w idth in good correspondence with the world average value. It is also s hown that the value of the rho --> eta gamma branching fraction is not iceably influenced by the existence of the anomaly. Finally, we give f or the first time the absolute value for the hadronic phases of the ve ctor mesons for the decay modes eta gamma and pi(0) gamma.