Abstract
The τ− → π−π0ντ and e+e− → π+π− processes have been described within the chiral Nambu—Jona-Lasinio model including the interaction of pions in the final state beyond the 1/Nc approximation. A loop correction caused by the ρ-meson exchange between pions, which makes the leading contribution in the P-wave channel, is taken into account. The results are in satisfactory agreement with experimental data for both processes.
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