Amplitude Analysis of the Decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and ${\eta }^{\prime }\to {\pi }^0{\pi }^0{\pi }^0$

M. Ablikim, M. N. Achasov, X. C. Ai +419

Based on a sample of $1.31\times 10^9$ $J/\psi$ events collected with the BESIII detector, an amplitude analysis of the isospin-violating decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and…