论文标题
CDEX-10中对宇宙射线的限制增强了DM
Constraints on cosmic-ray boosted DM in CDEX-10
论文作者
论文摘要
暗物质（DM）直接检测实验一直在对几个GEV上方的DM质量的DM核子散射截面上设定了强限，但是在低质量区域未探索大型参数空间。如果DM可以在直接检测实验中产生核后坐力，以提供可观察到的信号，则可能会被相对论宇宙射线散射和增强。由于使用锗的低能阈值检测器对普通的Halo GEV尺寸DM提供了良好的限制，因此在CDEX-10实验中，必须重新分析102.8 kg $ \ times $ DAM DATA，假设DM可以通过宇宙射线促进DM。对于DM质量范围1 KEV $ <m_χ<$ 1 MEV和1 kpc以内的有效距离，我们在$ 8.32 \ times10^{ - 30} $ cm $^2 $ $ 8.32 \ times10^{ - 30} $ CM $^2 $上，在90 \％的置信度下以90 \％的置信度。 CDEX-10结果能够在Miniboone和Xenon1T约束之间的参数空间中明确缩小差距，这受到地球衰减效果的部分阻碍。我们还定量计算了在未来的直接检测实验中搜索CRBDM时的预期中微子地板。
Dark matter (DM) direct detection experiments have been setting strong limits on the DM-nucleon scattering cross section at the DM mass above a few GeV, but leave large parameter space unexplored in the low mass region. DM is likely to be scattered and boosted by relativistic cosmic rays in the expanding universe if it can generate nuclear recoils in direct detection experiments to offer observable signals. Since low energy threshold detectors using Germanium have provided good constraints on ordinary halo GeV-scale DM, it is necessary to re-analyze 102.8 kg$\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.
