LUX-ZEPLIN反冲事件在2HD+a模型中的一种可能解释
A possible interpretation of the LUX-ZEPLIN recoil event in the 2HD+a scenario
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中文总结 AI 辅助
本文在2HD+a模型中解释LZ实验观测到的248 keV核反冲事件，发现重2HDM谱、轻赝标量（1-10 GeV）和几百GeV暗物质费米子的参数区域与该事件兼容，并满足多种约束。
中文摘要 AI 辅助
考虑LUX-ZEPLIN（LZ）实验最近观测到的一个高能核反冲候选事件，其反冲能量约为$E_{\rm Recoil} \simeq 248$ keV，将其视为长期寻找的弱相互作用大质量暗物质（DM）粒子的信号，这令人兴奋。尽管该信号仍然较弱，需要进一步的数据和检查来确认，我们尝试在2HD+a模型的背景下对其进行解释。在该模型中，一个双希格斯二重态模型（2HDM）补充了一个轻的赝标量希格斯玻色子$a$和一个同位旋单态费米子暗物质粒子$\chi$。该模型具有再现正确的宇宙学密度并规避先前来自暗物质粒子直接和间接探测的限制的优点，同时通过来自对撞机搜索以及希格斯、电弱玻色子和重味夸克扇区高精度测量的所有约束。我们确实找到了模型参数空间中的一些区域，这些区域具有相当重的2HDM谱，但有一个非常轻的赝标量$a$玻色子，$m_a \approx 1-10$ GeV，以及一个质量为几百GeV的暗物质费米子，这些区域与LZ反冲事件兼容。我们还对具有费米子暗物质的2HD+a模型的参数空间进行了广泛的调查，包括来自暗物质现象学和对撞机搜索以及精密测量的广泛互补约束。
英文摘要
It is tantalizing to consider the recent observation of the LUX-ZEPLIN (LZ) experiment of a high energy nuclear recoil candidate at $E_{\rm Recoil} \simeq 248$ keV as the long-awaited signal of a weakly interacting massive Dark Matter (DM) particle. Although this signal is still weak and needs to be confirmed by further data and inspection, we attempt to interpret it in the context of the 2HD+a model in which a two-Higgs doublet model (2HDM) is supplemented by a light pseudoscalar Higgs boson $a$ and an isosinglet fermionic DM particle $χ$. The model has the virtue of reproducing the correct cosmological density and evading the previous limits from direct and indirect detection of DM particles, while passing all constraints from colliders searches and high-precision measurements in the Higgs, electroweak boson and heavy-flavor sectors. We indeed find regions of the parameter space of the model, with a rather heavy 2HDM spectrum but a very light pseudoscalar $a$ boson, $m_a \approx 1-10$ GeV, as well as a DM fermion with a mass of a few hundred GeV, which are compatible with the LZ recoil event. The related extensive investigation of the parameter space of the 2HD+a model with fermionic DM, including the wide range of complementary constraints from both DM phenomenology and collider searches as well as precision measurements are presented.
发表机构
- Universita degli Studi di Messina（墨西拿大学）
- INFN Sezione di Catania（意大利国家核物理研究所卡塔尼亚分部）
- INFN Sezione di Torino（意大利国家核物理研究所都灵分部）
- Universidad de Granada（格拉纳达大学）
- International Institute of Physics, Universidade Federal do Rio Grande do Norte（北里奥格兰德联邦大学国际物理研究所）
- Universidad de La Serena（拉塞雷纳大学）
- Millennium Institute for Subatomic Physics at High-Energy Frontier (SAPHIR)（高能前沿亚原子物理学千年研究所（SAPHIR））
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