In light of the excess in the low-energy electron recoil events reported by XENON1T , many new physics scenarios have been proposed as a possible origin of the excess .
One possible explanation is that the excess is a result of a fast moving dark matter ( DM ) , with velocity v \sim 0.05 - 0.20 and mass between 1 MeV and 10 GeV , scattering off an electron .
Assuming the fast moving DM-electron interaction is mediated by a vector particle , we derive collider constraints on the said DM-electron interaction .
The bounds on DM-electron coupling is then used to constrain possible production mechanisms of the fast moving DM .
We find that the preferred mass of the vector mediator is relatively light ( \lesssim 1 GeV ) and the coupling of the vector to the electron is much smaller than the coupling to the fast moving DM .