Strong Constraints on Sub-GeV Dark Sectors from SLAC Beam Dump E137
Strong Constraints on Sub-GeV Dark Sectors from SLAC Beam Dump E137
We present new constraints on sub-GeV dark matter and dark photons from the electron beam-dump experiment E137 conducted at SLAC in 1980–1982. Dark matter interacting with electrons (e.g., via a dark photon) could have been produced in the electron-target collisions and scattered off electrons in the E137 detector, producing the …