Mechanisms of the Reaction π-p→ a⁰₀(980)n→π⁰ηn at High Energies

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Over the last twenty years, it was assumed that the reaction π-p→ a⁰₀(980)n→π⁰ηn at high energies is dominated by b₁ Regge pole exchange. We show that the new Brookhaven and Serpukhov data on the t distributions for this reaction can be explained within the framework of the Regge pole model only if the ρ₂ Regge pole exchange conspiring with its daughter plays a crucial role. The tentative estimates of the absolute π-p→ a⁰₀(980)n→π⁰ηn reaction cross section are obtained. The contributions of the one-pion exchange mechanism and the Regge cuts are also estimated.