Triangle diagrams in decay of E/ι-meson into KK¯π final state

The decay of E/ι-meson ( I ^G = 0 ⁺, J ^PC = 0 ^-+) through the chain E/ι → K*K¯( K¯*K) → KK¯π is studied in the framework of the model containing pole and triangle diagrams. The region with total mass (energy) of the ( E/ι) M ∼ 1400 ÷ 1500 MeV is considered. The final state KK¯-rescattering through a_o(980)-meson is taken into account in the triangle diagram. The contribution of a _oπ -mode from triangle diagram is shown to be small and consistent with the existing experimental data.