Precision measurement of the matrix elements for $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $\eta \to {\pi }^0{\pi }^0{\pi }^0$ decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +596

A precision measurement of the matrix elements for $\eta \to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $\eta \to {\pi }^0{\pi }^0{\pi }^0$ decays is performed using a sample of $(10087\pm 44)\times 10^6$ $J/\psi$ decays collected with th…