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Constraints on cosmic-ray boosted dark matter with realistic cross section
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abstract
Sub-MeV cold dark-matter particles are unable to produce electronic recoil in conventional dark-matter direct detection experiments such as XENONnT and LUX-ZEPLIN above the detector threshold. The mechanism of boosted dark matter comes into picture to constrain the parameter space of such low mass dark matter from direct detection experiments. We consider the effect of the leading components of cosmic rays to boost the cold dark matter, which results in significant improvements on the exclusion limits compared to the existing ones. To present concrete study results, we choose to work on models consisting of a dark-matter particle $\chi$ with an additional $U(1)'$ gauge symmetry including the secluded dark photon, $U(1)_{B-L}$, and $U(1)_{L_e-L_\mu}$. We find that the energy dependence of the scattering cross section plays a crucial role in improving the constraints. In addition, we systematically estimate the Earth shielding effect on boosted dark matter in losing energy while traveling to the underground detector through the Earth.
Forward citations
Cited by 4 Pith papers
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Cosmic-ray-electron boosted light dark matter: Implications of LZ 2025 data
Using LZ 2025 data, cosmic-ray-electron boosted sub-MeV dark matter is constrained at levels at or below the previous XENONnT reach, with the strongest gains claimed for light mediators.
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A congruous approach with realistic cross section towards limiting sub-GeV dark matter from LUX-ZEPLIN
Using LZ nuclear recoil data, the authors derive 90% CL exclusion limits on cosmic-ray-boosted sub-GeV dark matter for two U(1)' mediator models, with energy-dependent cross sections improving the lower reach versus c...
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