发表机构
Instituto de Física Corpuscular (IFIC), CSIC, Universitat de València; Indian Institute of Science Education and Research Bhopal（粒子物理研究所，西班牙科学委员会，巴伦西亚大学; 印度科学教育与研究学院博帕尔分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文通过轻Majoron介导的弹性散射解释LZ 248 keV事件，在scotogenic模型中实现暗物质，抑制太阳俘获并同时满足遗迹丰度。
AI 中文摘要
我们通过由轻Majoron介导的弹性暗物质散射来解释LZ报告的能量为248 keV核反冲候选事件。Majoron为所需的赝标量相互作用提供了自然起源：它是与自发轻子数破缺相关的准Nambu-Goldstone玻色子，直接将反冲信号与中微子质量产生联系起来。在对这一想法进行模型无关分析后，我们在一个scotogenic紫外完备化方案中给出了具体实现，其中最轻的单态Majorana费米子作为暗物质，并通过对称性破缺动力学获得其质量和Majoron耦合。一个类矢量上型夸克和夸克扇区中的I型Dirac跷跷板机制将Majoron相互作用传递给上夸克。在低能下，所产生的门户生成非相对论算符O_6，其动量依赖性再现了高反冲事件，而不会使较低能区过度填充。其自旋结构消除了主要的重元素太阳俘获通道，而氢上的俘获则因较差的运动学匹配和小动量转移而被抑制。这一构造同时再现了LZ反冲谱和观测到的热遗迹丰度，同时强烈抑制太阳俘获。
英文摘要
We interpret the $248~\mathrm{keV_{nr}}$ nuclear-recoil candidate reported by LZ through elastic dark matter scattering mediated by a light Majoron. The Majoron provides a natural origin for the required pseudoscalar interaction: it is the pseudo Nambu-Goldstone boson associated with spontaneous lepton number breaking, directly connecting the recoil signal to neutrino mass generation. After a model independent analysis of this idea, we present a concrete realization in a scotogenic ultraviolet completion in which the lightest singlet Majorana fermion is dark matter and acquires both its mass and Majoron coupling from the symmetry breaking dynamics. A vector like up type quark and a type-I Dirac seesaw in quark sector communicate the Majoron interaction to the up quark. At low energies, the resulting portal generates the nonrelativistic operator $\mathcal O_6$, whose momentum dependence reproduces the high-recoil event without overpopulating the lower energy bins. Its spin structure removes the dominant heavy element solar capture channels, while capture on hydrogen is suppressed by poor kinematic matching and small momentum transfer. This construction simultaneously reproduces the LZ recoil spectrum and the observed thermal relic abundance while strongly suppressing solar capture.
Comments17 pages, 3 figures, 1 table
