Search for invisible decays of a dark photon using $e^{+}{e}^{-}$ annihilation data at BESIII

BESIII Collaboration, M. Ablikim, M. N. Achasov +564

We report a search for a dark photon using $14.9$~fb${}^{-1}$ of $e^{+}{e}^{-}$ annihilation data taken at center-of-mass energies from 4.13 to 4.60~GeV with the BESIII detector operated a…