# 19th International Conference on Hadron Spectroscopy and Structure in memoriam Simon Eidelman

26-31 July 2021
Mexico City
Mexico/General timezone
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# The six-pion amplitude

• Tomas HUSEK

## Abstract

Within the framework of the massive O($N$) nonlinear sigma model extended to the next-to-leading order in the chiral counting (for $N=3$ corresponding to the two(-quark)-flavour Chiral Perturbation Theory), we calculate the relativistic six-pion scattering amplitude at low energy up-to-and-including terms $\mathcal{O}(p^6)$. The result for the four-pion amplitude in the case of $N$ (meson) flavours at $\mathcal{O}(p^4)$ is also presented.