轴子引道门暗物质与LUX-ZEPLIN高反冲事件
Axion Portal Dark Matter and the LUX-ZEPLIN High-Recoil Event
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中文总结 AI 辅助
针对LZ报告的248 keV核反冲事件，构建含狄拉克费米子暗物质等的轴子引道门暗物质弹性模型，其反冲谱给出2.6-$3.2\boldsymbol{\textit{\textbf{σ}}}$的局部显著性。
中文摘要 AI 辅助
LUX-ZEPLIN（LZ）已报告一例与248 keV核反冲相符的事件。尽管初始研究重点集中在非弹性暗物质上，但该解释高度依赖银河系晕不确定的高速尾部。我们转而构建赝标量-赝标量相互作用$L_4=(\bar{\rm \boldmath{\textit{\textbf{χ}}}} i\boldsymbol{\textit{\textbf{γ}}}^5 \boldsymbol{\textit{\textbf{χ}}})(\bar{\rm \boldmath{\textit{\textbf{N}}}} i\boldsymbol{\textit{\textbf{γ}}}^5 \boldsymbol{\textit{\textbf{N}}})$的弹性实现，其接触模板给出LZ识别到的最大局部显著性之一。所提出的最小模型主要包含狄拉克费米子暗物质和作为赝标量媒介子的复标量，最小的规范不变紫外完备模型还需要一个单一的多TeV矢量类重夸克。一个实现热退耦的代表性模型中，暗物质质量$m_\boldsymbol{\textit{\textbf{χ}}}=400$ GeV，媒介子质量$m_\boldsymbol{\textit{\textbf{a}}}=1$ GeV。该最简模型打破了同量异位旋标量/同量异位旋矢量假设，其响应级反冲谱介于LZ的弹性$O_4^v$和接触$L_4^v$模板之间，表明局部显著性为2.6-$3.2\boldsymbol{\textit{\textbf{σ}}}$。
英文摘要
LUX-ZEPLIN (LZ) has reported one event compatible with a $248~\mathrm{keV}$ nuclear recoil. While initial attention has focused on inelastic dark matter, that interpretation depends sensitively on the uncertain high-speed tail of the Galactic halo. We develop instead an elastic realisation of the pseudoscalar-pseudoscalar interaction $L_4=(\barχiγ^5χ)(\bar N iγ^5N)$, whose contact templates give one of the largest local significances identified by LZ. The minimal model presented involves Dirac fermion dark matter and a pseudoscalar mediator. The pseudoscalar arises from a complex singlet and the minimal gauge-invariant UV completion also requires a single multi-TeV vector-like heavy quark. A representative model which realises thermal freeze-out has $m_χ\sim 400~{\rm GeV}$ and $m_a\sim 1~{\rm GeV}$. The simplest model breaks from the isoscalar/isovector assumption, and the recoil spectrum lies between LZ's elastic $O_4^v$ and contact $L_4^v$ templates, suggesting a local significance of $2.6$-$3.2σ$.
发表机构
- University of Illinois Chicago（伊利诺伊大学芝加哥分校）
- University of Oxford（牛津大学）
机构由 AI 辅助整理，请以论文原文为准。
