Search for a massless dark photon in ${\Lambda }_c^{+}\to p{\gamma }^{\prime }$ decay

BESIII Collaboration, M. Ablikim, M. N. Achasov +569

A search for a massless dark photon ${\gamma }^{\prime }$ is conducted using 4.5 ${\mathrm{fb}}^{-1}$ of $e^{+}{e}^{-}$ collision data collected at center-of-mass energies between 4.600 and 4.699 $…