Search for intermediate resonances and dark gauge bosons in $J/\psi \to \gamma {\pi }^0{\eta }^{\prime }$

BESIII Collaboration

We report on an analysis of the decay $J/\psi \to \gamma {\pi }^0{\eta }^{\prime }$ using a sample of $(1310.6\pm 7.0)\times 10^{6}J/\psi$ events collected with the BESIII detector. We search for…