Abstract
Within the Extended Nambu Jona-Lasinio model, we calculate the O( π 6) counterterms entering the low-energy expansion of the ψψ → π 0 π 0 and the η → π 0 ψψ amplitudes in Chiral Perturbation Theory. For ψψ → π 0 π 0 our results are compatible with both the experimental data and the two-loop calculation using meson resonance saturation. For the η decay we find Φ( η → π 0 ψψ) = 0.58 ± 0.3 eV which is in agreement with experiment within one standard deviation. We also give predictions for the neutral pion polarizabilities and compare them with the results obtained from resonance saturation.
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