Diurnal Effect of Sub-GeV Dark Matter Boosted by Cosmic Rays
Shao-Feng Ge, Jiang-Lai Liu, Qiang Yuan, Ning Zhou
TL;DR
This paper discusses a new diurnal modulation effect in cosmic ray boosted sub-GeV dark matter detection, caused by Earth's attenuation of DM flux, offering a novel signature for direct detection experiments.
Contribution
It introduces the concept of diurnal modulation due to Earth attenuation in cosmic ray boosted dark matter, highlighting a new detection signature for sub-GeV DM.
Findings
Diurnal modulation depends on DM-nucleus cross sections.
Earth attenuation significantly affects DM flux.
Provides a new detection signature for sub-GeV DM.
Abstract
We point out a new type of diurnal effect for the cosmic ray boosted dark matter (DM). The DM-nucleon interactions not only allow the direct detection of DM with nuclear recoils, but also allow cosmic rays to scatter with and boost the nonrelativistic DM to higher energies. If the DM-nuclei scattering cross sections are sufficiently large, the DM flux is attenuated as it propagates through the Earth, leading to a strong diurnal modulation. This diurnal modulation provides another prominent signature for the direct detection of boosted sub-GeV DM, in addition to signals with higher recoil energy.
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