非弹性暗物质与LZ实验中的高能反冲信号
Inelastic Dark Matter and High-Energy Recoil Signatures in LZ
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中文总结 AI 辅助
本文研究双组分非弹性暗物质模型，其与靶核散射可在高反冲能区产生信号，无需依赖速度分布尾部，从而放宽IceCube约束，并解释LZ实验的高能事件过剩。
中文摘要 AI 辅助
我们研究了由双组分暗物质粒子$(\chi_1,\chi_2)$组成的非弹性暗物质（iDM），该模型是超越常用单组分暗物质模型的最小扩展。这种iDM与靶核散射的一个显著特征是在放热和吸热过程中都倾向于在高核反冲（NR）能量区域产生信号。特别是对于放热暗物质情景，信号不依赖于玻尔兹曼速度分布的尾部。因此，所需的暗物质-核散射截面显著减小，这反过来有助于大幅放宽IceCube中微子搜索所施加的严格约束。利用非弹性暗物质-核散射，我们自然地解释了LUX-ZEPLIN（LZ）实验新报道的高反冲能量事件过剩。
英文摘要
We study the inelastic dark matter (iDM) that consists of two-component dark matter particles $(χ_1,χ_2)$ and serves as a minimal extension beyond the commonly used one-component DM models. A distinctive feature of such iDM scattering with the target nuclei is to favorably produce signals at high nuclear recoil (NR) energy region in both exothermic and endothermic processes. In particular, for the exothermic dark matter scenario, the signal does not rely on the tail of the Boltzmann velocity distribution. As a result, the required DM-nucleus scattering cross section is significantly reduced, which in turn helps to substantially relax the stringent constraints imposed by IceCube neutrino searches. Using the inelastic DM-nucleus scattering, we naturally explain the newly reported event excess at high recoil energy with the LUX-ZEPLIN (LZ) experiment.
发表机构
- Department of Physics, Tsinghua University（清华大学物理系）
- Center for High Energy Physics, Peking University（北京大学高能物理中心）
- Department of Physics and Jockey Club Institute for Advanced Study, The Hong Kong University of Science and Technology（香港科技大学物理系及赛马会高等研究院）
机构由 AI 辅助整理，请以论文原文为准。
