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arXiv 2008.07116hep-phhep-ex
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CDEX-10中对cosmic-ray提升的DM的约束

Constraints on cosmic-ray boosted DM in CDEX-10

Zhan-Hong Lei, Jian Tang, Bing-Long Zhang

摘要:

暗物质(DM)直接探测实验在DM质量大于几GeV时对DM-核子散射截面有很强的限制,但在低质量区留下了很大的参数空间。如果DM能在直接探测实验中产生核反冲以提供可观测的信号,那么它很可能会被膨胀宇宙中的相对论性宇宙射线散射和增强。由于使用锗的低能量阈值探测器对普通晕GeV尺度DM提供了良好的约束,因此有必要重新分析CDEX-10实验中102.8 kg $\times$天的数据,假设DM由宇宙射线增强。对于DM质量范围为1 keV的$<m_χ<$ ~ 1 MeV,有效距离在1 kpc以内的情况,在90%的置信水平下,我们在$8.32\times10^{-30}$ cm $^2$处得到了自旋无关的DM-核子散射截面上几乎平坦的下限. CDEX-10的结果是能够关闭的MiniBooNE和XENON 1 T约束之间的参数空间,这是部分地阻碍了地球衰减效应之间的差距明确。我们还定量计算了预期的中微子地板上寻找CRBDM在未来的直接检测实验使用锗。

英文摘要:

Dark matter (DM) direct detection experiments have been setting strong limits on the DM-nucleon scattering cross section at the DM mass above a few GeV, but leave large parameter space unexplored in the low mass region. DM is likely to be scattered and boosted by relativistic cosmic rays in the expanding universe if it can generate nuclear recoils in direct detection experiments to offer observable signals. Since low energy threshold detectors using Germanium have provided good constraints on ordinary halo GeV-scale DM, it is necessary to re-analyze 102.8 kg$\times$day data in the CDEX-10 experiment assuming that DM is boosted by cosmic rays. For the DM mass range 1 keV $<m_χ<$ 1 MeV and the effective distance within 1 kpc, we reach an almost flat floor limit at $8.32\times10^{-30}$ cm$^2$ on spin-independent DM-nucleon scattering cross section at a 90\% confidence level. The CDEX-10 result is able to close the gap unambiguously in the parameter space between MiniBooNE and XENON1T constraints which was partially hindered by the Earth attenuation effect. We also quantitatively calculate expected neutrino floor on searching for CRBDM in future direct detection experiments using Germanium.

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