Phase of phi omega interference due to unitarity corrections to the amplitude of phi omega mixing

The phase of phi omega interference in the reaction e(+)e(-) --> pi (+)pi ( -)pi (0) near the energy of the phi (1020) peak is calculated within an app roach that is virtually independent of the model for phi omega mixing. A co mparison with the phase measured recently (with a poor precision) shows tha t the deviation of the measured result from the expected value of 180 degre es is associated largely with the effect of the right shoulder of the omega (782) peak in the region of the phi (1020) peak. The omega width at the en ergy equal to the phi mass is within the interval 120-200 MeV. The effect o f the phi omega -state-induced unitarity corrections to the phi and omega c oupling constants on the phase of pn interference is considered in detail. (C) 2000 MAIK "Nauka/Interperiodica".