Abstract
We study the K →2π decays using the UL(3) × UR(3) version of the Nambu-Jona-Lasinio model with the effective ΔS = l nonleptonic weak interaction. The ΔI=3/2 amplitude is in reasonable agreement with experimental data. On the other hand, the calculated ΔI=1/2 amplitudes strongly depend on the mass of the low-lying scalar-isoscalar σ meson, and therefore give a strong constraint on the parameters of the model.
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