The reaction $\pi N\to \pi \pi N$ above threshold in heavy-baryon chiral perturbation theory

J. Zhang, N. Mobed, M. Benmerrouche

We study the reaction ${\pi }^{\pm }p\to {\pi }^{\pm }{\pi }^{+}n$ and ${\pi }^{-}p\to {\pi }^0{\pi }^{0}n$ in heavy-baryon chiral perturbation theory of chiral order three from threshold up to pion laboratory kine…