Stringent test of $CP$ symmetry in ${\Sigma }^{+}$ hyperon decays

BESIII Collaboration, M. Ablikim, M. N. Achasov +678

The non-leptonic two-body weak decays ${\Sigma }^{+}\to p{\pi }^0$ and ${\bar{\Sigma }}^{-}\to \bar{p}{\pi }^0$ are investigated, utilizing $(1.0087\pm 0.0044)\times 10^{10}$ $J/\psi$ events and $(2.7124\p…