LZ事件与双态暗物质晕
The LZ event with a two-state dark matter halo
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中文总结 AI 辅助
针对LZ实验的核反冲候选事件，研究双态暗物质晕中放热散射的贡献，发现χ2占比高时所需截面大幅降低，且吸热截止消失。
中文摘要 AI 辅助
LUX-ZEPLIN（LZ）实验报告了一个能量约为248 keV的单核反冲候选事件。LZ将其解释为非弹性暗物质从其基态χ1 N → χ2 N发生吸热散射。在伪狄拉克模型中，激发态χ2可以存活至今，因此放热散射χ2 N → χ1 N也是可能的。已发表的LZ置信区间并未描述这种情况。我们重建了LZ的统计推断，并针对已发表的区间进行了验证。然后我们将其应用于包含比例为f的χ2的暗物质晕。对于f ≳ 10⁻⁵–10⁻²，取决于质量劈裂，放热贡献占主导。当f=1/2时，候选事件所需的截面在δ=250–350 keV范围内下降80倍至1.6×10⁴倍，并且吸热信号的运动学截止消失。一个仅用χ1解释该事件的基准模型，在暗物质晕的一半为χ2时，比上限高出30倍。
英文摘要
The LUX-ZEPLIN (LZ) experiment has reported a single nuclear-recoil candidate at $E_R \simeq 248$keV. LZ interprets it in terms of inelastic dark matter that scatters endothermically from its ground state, $χ_1 N \to χ_2 N$. In pseudo-Dirac models the excited state $χ_2$ can survive to the present day, and exothermic scattering, $χ_2 N \to χ_1 N$, is then also open. The published LZ intervals do not describe this case. We rebuild the LZ statistical inference and validate it against the published intervals. We then apply it to a halo that contains a fraction $f$ of $χ_2$. For $f \gtrsim 10^{-5}$--$10^{-2}$, depending on the mass splitting, the exothermic contribution dominates. For $f=1/2$ the cross section required by the candidate drops by factors of $80$ to $1.6\times10^4$ for $δ= 250$--$350$~keV, and the kinematic cutoff of the endothermic signal disappears. A benchmark that explains the event with $χ_1$ alone lies a factor of $30$ above the upper limit when half of the halo is $χ_2$.
发表机构
- Departamento de Física da Universidade de Aveiro（阿威罗大学物理系）
- Laboratório de Instrumentação e Física Experimental de Partículas (LIP), Universidade do Minho（米尼奥大学实验粒子仪器与物理实验室(LIP)）
- Lund University（隆德大学）
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