发表机构
Indian Institute of Technology Guwahati（印度理工学院古瓦哈提分校）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文在单态-双重态标量暗物质框架下，解释LZ实验的高能核反冲事件，通过非弹性上散射机制，并扩展了允许的参数空间。
AI 中文摘要
我们研究了在单态-双重态标量暗物质（DM）框架内解释LUX-ZEPLIN（LZ）合作组最近报道的高能核反冲事件的可能性。考虑DM为由一个标量双重态和一个实标量单态形成的CP偶质量本征态，两者在未破缺的$Z_2$对称性下均为奇性，我们发现模型的参数空间与正确的遗迹丰度以及弹性散射率的直接探测限制相一致。参数空间的很大一部分还可以导致DM的非弹性上散射，其速率和反冲能量与最近的LZ事件一致。取决于单态-双重态混合，与纯标量双重态DM极限相比，该模型允许更宽范围的当前允许参数空间。$Z_2$-奇性右手中微子的存在也导致了与轻中微子质量起源和轻子生成相关的其他有趣现象。
英文摘要
We study the possibility of explaining the recently reported high-energy nuclear recoil event by the LUX-ZEPLIN (LZ) collaboration within the framework of singlet-doublet scalar dark matter (DM). Considering DM to be the CP even mass eigenstate formed out of a scalar doublet and a real scalar singlet, both being odd under an unbroken $Z_2$ symmetry, we find the parameter space of the model consistent with correct relic abundance and direct-detection limits on elastic scattering rates. A large part of the parameter space can also lead to inelastic up-scattering of DM with a rate and recoil energy consistent with the recent LZ event. Depending upon the singlet-doublet mixing, the model allows a much wider range of currently allowed parameter space compared to the pure scalar doublet DM limit, which is disfavored due to non-observations of high-energy neutrinos from solar-captured DM annihilation by the IceCube experiment. Presence of $Z_2$-odd right-handed neutrinos also leads to other interesting phenomenology related to the origin of light neutrino masses and leptogenesis.
Commentsv2: updated references and bounds from solar capture, 11 pages, 6 captioned figures
