发表机构
Kyushu University; Kanazawa University; University of Tokyo（九州大学; 金泽大学; 东京大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本研究提出一种双组分暗物质模型，其中准pNGB激发态通过放热核反冲解释LUX-ZEPLIN高能事件，并可通过媒介子搜索验证。
AI 中文摘要
我们研究了一个双组分暗物质场景，包含一个稳定的准Nambu-Goldstone玻色子（pNGB）及其近简并的长寿命准pNGB伙伴。一个近似的标量对称性关联了它们的质量，并通过小的质量劈裂抑制了激发态通过树级Higgs介导的弹性散射。它们耦合的热演化产生了相当的遗迹丰度，而要求观测到的总丰度固定了暗标量对称性破缺标度，从而也固定了暗规范耦合。在所研究的基准点上，在所采用的演化假设下，大约一半的激发态分数存活下来。因此，尽管树级弹性信号被抑制，准pNGB激发态仍能产生放热核反冲。作为一个应用，我们检验了高能LUX-ZEPLIN事件。对于遗迹兼容的参数，反冲归一化固定了动力学混合，使得这一解释可以通过独立的媒介子搜索来检验。
英文摘要
We study a two-component dark matter scenario comprising a stable pseudo-Nambu-Goldstone boson (pNGB) and its nearly degenerate long-lived quasi-pNGB partner. An approximate scalar symmetry relates their masses and suppresses the tree-level Higgs-mediated elastic scattering of the excited state through the small mass splitting. Their coupled thermal evolution yields comparable relic populations, while requiring the observed total abundance fixes the dark scalar symmetry-breaking scale and hence the dark gauge coupling. At the studied benchmark, an excited fraction of approximately one half survives under the adopted evolution assumptions. The quasi-pNGB excited state can therefore produce exothermic nuclear recoils despite a suppressed tree-level elastic signal. As an application, we examine the high-energy LUX-ZEPLIN event. For relic compatible parameters, the recoil normalization fixes the kinetic mixing, allowing this interpretation to be tested by independent mediator searches.
Comments9 pages, 2 tables, 7 figures
