Journal
PHYSICAL REVIEW LETTERS
Volume 126, Issue 9, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.126.091804
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Funding
- Double First Class start-up fund by Tsung-Dao Lee Institute [WF220442604]
- Shanghai Pujiang Program [20PJ1407800]
- National Natural Science Foundation of China [12090064, 11722328, 11851305, 11525522, 11775141, 12090061]
- 100 Talents Program of the Chinese Academy of Sciences
- Program for Innovative Talents and Entrepreneur in Jiangsu
- Ministry of Science and Technology of China [2016YFA0400301]
- Office of Science and Technology, ShanghaiMunicipal Government [18JC1410200]
- Hongwen Foundation in Hong Kong
- Chinese Academy of Sciences Center for Excellence in Particle Physics (CCEPP)
- Shanghai Jiao Tong University
- Tencent Foundation
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A new type of diurnal effect has been identified for cosmic ray boosted dark matter, where interactions with nuclei lead to modulation in DM flux making it accessible for direct detection. This provides a prominent signature for detecting boosted sub-GeV DM.
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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