发表机构
National Tsing Hua University; Seoul National University of Science and Technology（国立清华大学; 首尔科学技术大学）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
针对LZ实验观测到的248 keV核反冲事件，提出1.1 TeV Higgsino非弹性暗物质模型，预言chargino质量劈裂约350 MeV，产生亚厘米级短径迹，可在未来对撞机检验。
AI 中文摘要
LZ合作组观测到的反冲能量$E_R \approx 248\text{ keV}$的高能核反冲事件，为具有$1.1\text{ TeV}$ Higgsino非弹性暗物质的模型提供了令人振奋的线索。如此高的反冲能量要求两个近简并中性态之间存在约（$\delta \approx 350\text{ keV}$）的质量劈裂。我们证明，在MSSM框架内，该模型预言了一个近简并的带电Higgsino态，即chargino，其与中性态的质量劈裂约为$\mathcal{O}(350)$~MeV量级。一旦在对撞机上产生，此类chargino的后续衰变将导致探测器中出现亚厘米级的带电径迹或短径迹（寿命$\tau \approx 0.025\text{ ns}$）。我们表明，该情景不受当前LHC约束的限制，并可在未来的高能对撞机（包括HL-LHC、100 TeV $pp$对撞机和缪子对撞机）上进行检验。最关键的要求在于能够重建多短的径迹或短径迹。
英文摘要
The high-energy nuclear recoil event with recoil energy $E_R \approx 248\text{ keV}$ observed by the LZ collaboration provides an exciting hint toward a model with a $1.1\text{ TeV}$ Higgsino inelastic dark matter. Such a recoil energy requires a mass splitting of order ($δ\approx 350\text{ keV}$) between the two nearly-degenerate neutral states. We show that within the framework of the MSSM, the model predicts a nearly-degenerate charged Higgsino state, chargino, whose mass splitting from the neutral states is of order $\mathcal{O}(350)$~MeV. The subsequent decays of such charginos once produced at colliders would lead to a sub-centimeter charged track or tracklet (with lifetime $τ\approx 0.025\text{ ns}$) at the detector. We show that such a scenario is not constrained by the current LHC bounds, and could be tested at future high-energy colliders, including HL-LHC, 100 TeV $pp$ colliders, and muon colliders. The most critical requirement is how short a track or tracklet can be reconstructed.
Comments19 pages, 2 figures, 1 table
