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2014

Strong Constraints on Sub-GeV Dark Matter from SLAC Beam Dump E137

Batell, Brian, Essig, Rouven, Surujon, Ze'ev

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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 striking, zero-background signature of a high-energy electromagnetic shower that points back to the beam dump.
E137 probes new and significant ranges of parameter space, and constrains the well-motivated possibility that invisibly decaying dark photons can explain the $\sim 3.6 \sigma$ discrepancy between the measured and SM value of the muon anomalous magnetic moment.
It also restricts the parameter space in which the relic density of dark matter in these models is obtained from thermal freeze-out.

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