Diurnal Effect of Sub-GeV Dark Matter Boosted by Cosmic Rays

作     者：Shao-Feng Ge Jianglai Liu Qiang Yuan Ning Zhou 

作者机构：Tsung-Dao Lee Institute Shanghai Jiao Tong University Shanghai 200240 China School of Physics and Astronomy Shanghai Jiao Tong University Key Laboratory for Particle Astrophysics and Cosmology (MOE) and Shanghai Key Laboratory for Particle Physics and Cosmology Shanghai 200240 China Key Laboratory of Dark Matter and Space Astronomy Purple Mountain Observatory Chinese Academy of Sciences Nanjing 210033 China School of Astronomy and Space Science University of Science and Technology of China Hefei 230026 China Center for High Energy Physics Peking University Beijing 100871 China 

出 版 物：《Physical Review Letters》 (物理评论快报)

年 卷 期：2021年第126卷第9期

页      面：091804-091804页

核心收录：

学科分类：07[理学] 0702[理学-物理学] 

基　　金：Ministry of Science and Technology of the People's Republic of China, MOST, (2016YFA0400301) Office of Science and Technology, Shanghai Municipal Government, (18JC1410200) Tsung-Dao Lee Institute Chinese Academy of Sciences Center for Excellence in Particle Physics Program for Innovative Talents and Entrepreneur in Jiangsu, (11775141, 11525522, 12090061) CAS Center for Excellence in Particle Physics, CCEPP Hongwen Foundation Double First Class start-up fund, (WF220442604) Tencent Foundation Shanghai Jiao Tong University, SJTU Chinese Academy of Sciences, CAS Shanghai Pujiang Program, (20PJ1407800) National Natural Science Foundation of China, NSFC, (11722328, 11851305, 12090064) 

主　　题：Cosmic rays & astroparticles Particle dark matter 

摘      要：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.