Decay of the phi → 2π

Principal channels of the PSI→2 π decay naimly PSI→γ→2π; PSI→ω→rho→2π; PSI→rho→2π are considered. Theoretical estimation of the widths of these processes is obtained taking into account experimental data. Diagrams of main mechanisms of the decays PSI→2π and ω→3π, res the form of tables relative probabilities of PSI → 3π are p'ted. In contributions of intermediate states etaγ, πdegγ, k+k-, k0 anti k0 in relation to the principal channel PSI→γ→2π and coupling constant ratio are given. The obtained value of the relative probability of the decay B(PSI →2π)=(2.4+0.5)x10-4 is in agreement within the errors with experimental data