Improved measurement of the decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+(0)}{\pi }^{-(0)}$ and search for the rare decay ${\eta }^{\prime }\to 4{\pi }^0$

BESIII Collaboration, M. Ablikim, M. N. Achasov +617

Using a sample of 10 billion $J/\psi$ events collected with the BESIII detector, the decays ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^{+}{\pi }^{-}$, ${\eta }^{\prime }\to {\pi }^{+}{\pi }^{-}{\pi }^0{\pi }^0$ and ${\eta }^{\prime }\to 4{\pi }^0$ are studi…