用于LUX-ZEPLIN高反冲事件和银晕伽马射线超出的非弹性暗光子暗物质
Inelastic Dark Photon Dark Matter for the LUX-ZEPLIN High-Recoil Event and the Galactic Halo Gamma-Ray Excess
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中文总结 AI 辅助
本研究提出单一暗光子暗物质框架，用非弹性转变同时解释费米-LAT数据的银晕伽马射线超出与LUX-ZEPLIN合作组的248±46 keV核反冲事件，且保留原基准的遗迹丰度等性质。
中文摘要 AI 辅助
我们表明，单一暗光子暗物质框架可同时解释两项近期报道的异常：Totani团队基于15年费米-LAT数据识别出的类银晕伽马射线超出，以及LUX-ZEPLIN合作组报道的核反冲感兴趣事件，其核反冲能量为$E_{\rm nr}=248\pm23\\,(\text{统计})\pm23\\,(\text{系统})$ keV。该暗物质为$U(1)_X$暗光子$X$，质量$m_X=420$ GeV，由暗宇称稳定，禁止与标准模型光子发生动力学混合。为通过索末菲增强解释Totani超出所需的轻标量媒介子$\phi$，被扩展为耦合近简并的更重矢量伙伴$V$与$X$。由此产生的非弹性转变$X+N \to V+N$，质量分裂$\delta\simeq316$ keV，接近$m_X=420$ GeV的运动学终点，计入探测器能量分辨率后可自然重现定位的LZ事件，同时基本保留原Totani基准的遗迹丰度和银晕现象学不变。
英文摘要
We show that a dark-photon dark matter framework can simultaneously account for two recently reported anomalies: the halo-like Galactic gamma-ray excess identified by Totani in 15 years of Fermi-LAT data, and the $E_{\rm nr}=248\pm23\,({\rm stat})\pm23\,({\rm sys})$ keV nuclear-recoil event of interest reported by the LUX-ZEPLIN Collaboration. The dark matter is a $U(1)_X$ dark photon $X$ with mass $m_X=420$ GeV, stabilized by a dark parity that forbids kinetic mixing with the Standard Model photon. A light scalar mediator $ϕ$, required to explain the Totani excess via Sommerfeld enhancement, is joined by a second light scalar $ϕ'$ that couples a nearly degenerate heavier vector partner $V$ to $X$. The resulting inelastic transition $X+N\to V+N$, with mass splitting $δ\simeq316$ keV close to the kinematic endpoint for $m_X=420$ GeV, naturally reproduces the localized LZ event once the detector energy resolution is included, while leaving the relic abundance and the halo phenomenology of the original Totani-motivated benchmark essentially unchanged.
发表机构
- Ibaraki University（茨城大学）
机构由 AI 辅助整理，请以论文原文为准。
