Abstract
We study the possibility to directly detect the boosted dark matter generated from the scatterings with high energetic cosmic particles such as protons and electrons. As a concrete example, we consider the sub-GeV dark matter mediated by a $U(1)_D$ gauge boson which has mixing with $U(1)_Y$ gauge boson in the standard model. The enhanced kinetic energy of the light dark matter from the collision with the cosmic rays can recoil the target nucleus and electron in the underground direct detection experiments transferring enough energy to them to be detectable. We show the impact of BDM with existing direct detection experiments as well as collider and beam-dump experiments.
Highlights
The nature of dark matter (DM) is one of the unsolved problems in the astro-particle physics that spans from the small scales of the Galaxy to the large scales of the Universe [1]
III, we summarize the generation of boosted DM (BDM) and attenuation
IV, we show the results with constraints from BDM and conclude in Sec
Summary
The nature of dark matter (DM) is one of the unsolved problems in the astro-particle physics that spans from the small scales of the Galaxy to the large scales of the Universe [1]. The constraints on the scattering cross section of DM with an electron is σχe ≳ 3 × 10−38 cm at 100 MeV [3,4,5] In these studies of the DM direct detection, the DMs are assumed to be nonrelativistic with a Mawell-Boltzmann distribution around the Milky Way galaxy, with a speed around 10−3c, with the speed of light c. The boosted DM (BDM) can transfer large momentum to the target and make the recoil energy above the detector threshold even with the light DM This was used to search for dark matter in simple models [10,11,12,13,14]. For the scattering with the nucleus, the cross section at finite momentum transfer is corrected with a form factor as given by σχNðs; q2Þ 1⁄4 σχNðsÞ × F2ðq2Þ; ð6Þ where q2 1⁄4 2mNTN, with the mass of the target mN and recoil kinetic energy TN. When mχ < mZd (left), the cross section is enhanced at high Ti; when mχ > mZd (right), the cross section is suppressed at large Ti due to the relations between the momentum transfer and the masses of the relevant particles
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