Dark Photon Searches with Initial-State Radiation at Fixed-Target Configurations

Shao-Feng Ge, Jinhan Liang, Zuowei Liu +1

In this work, we investigate the contribution of the annihilation process with initial-state radiation ($e^{+}{e}^{-}\to {\hat{I}}^3{A}^{\prime }$) to the invisible dark photon ($A^{\prime }$) searches at the elec…