Search for vector mediator of Dark Matter production in invisible decay mode

NA64 Collaboration, D. Banerjee, V. E. Burtsev +41

A search is performed for a new sub-GeV vector boson ($A^{\prime }$) mediated production of Dark Matter ($\chi$) in the fixed-target experiment, NA64, at the CERN SPS. The $A^{\prime }$, called dark ph…