Probing sub-GeV Dark Matter with conventional detectors

Abstract

The direct detection of Dark Matter particles with mass below the GeV-scale is hampered by soft nuclear recoil energies and finite detector thresholds. For a given maximum relative velocity, the kinematics of elastic Dark Matter nucleus scattering sets a principal limit on detectability. Here we propose to bypass the kinematic limitations by considering the inelastic channel of photon emission in the nuclear recoil. Our proposed method allows to set the first limits on Dark Matter below 500 MeV in the plane of Dark Matter mass and cross section with nucleons. In situations where a Dark Matter-electron coupling is suppressed, Bremsstrahlung may constitute the only path to probe low-mass Dark Matter awaiting new detector technologies with lowered recoil energy thresholds.

6 pages, 4 figures; assumptions for future projections revised, references added, conclusions unchanged. Journal version

References in corpus (5)

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• Semiconductor Probes of Light Dark Matter
• Leptophobic Dark Matter at Neutrino Factories
• Hidden GeV-scale interactions of quarks
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• Cosmic-ray upscattered inelastic dark matter
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• Laser induced fluorescence for axion dark matter detection: a feasibility study in YLiF${}_4$:Er${}^{3+}$
• Calibration of a two-phase xenon time projection chamber with a ${}^{37}$Ar source
• MeV Gamma-Ray Constraints for Light Dark Matter from Semi-Annihilation