New strong bounds on sub-GeV dark matter from boosted and Migdal effects

Due to the low nuclear recoils, sub-GeV dark matter (DM) is usually beyond the sensitivity of the conventional DM direct detection experiments. The boosted and Migdal scattering mechanisms have been proposed as two new complementary avenues to search for light DM. In this study, we consider the momentum-transfer effect in the DM-nucleus scattering to derive the new bounds on sub-GeV DM for these two scenarios. We show that such an effect is sizable so that the existing bounds on the DM-nucleus scattering cross section can be improved significantly.

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6+4 pages, discussions and references added, version accepted by journal

sub-GeV dark matter
Migdal effect
atmospheric dark matter
momentum-transfer
ionization: energy
cosmic radiation: energy
energy: high
dark matter: density
atmosphere
momentum transfer

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