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The processes and $e^{+}e^{-} \to \pi^{+} \pi^{-}$ are considered within the chiral Nambu–Jona-Lasinio model with taking into account the pion final state interactions beyond the leading approximation. The contribution of the loop correction caused by a meson exchange between the pions, which gives the main contribution in the P-wave channel, is caclulated. The results for both processes are in a satisfactory agreement with experimental data.

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