Observation of a Neutral Structure near the $D{\bar{D}}^{\ast }$ Mass Threshold in $e^{+}{e}^{-}\to (D{\bar{D}}^{\ast }{)}^0{\pi }^0$ at $\sqrt{s}$ = 4.226 and 4.257 GeV

BESIII Collaboration, M. Ablikim, M. N. Achasov +400

A neutral structure in the $D{\bar{D}}^{\ast }$ system around the $D{\bar{D}}^{\ast }$ mass threshold is observed with a statistical significance greater than 10$\sigma$ in the processes $e^{+}e^{-…