发表机构
Tsung-Dao Lee Institute, Shanghai Jiao Tong University; School of Physics and Astronomy, Shanghai Jiao Tong University; Department of Physics, University of Tokyo; Kavli Institute for the Physics and Mathematics of the Universe (Kavli IPMU), University of Tokyo（上海交大李政道研究所; 上海交通大学物理与天文学院; 东京大学物理学系; 东京大学宇宙物质起源科学中心）
机构由 AI 辅助整理，请以论文原文为准。AI 中文总结
本文研究LZ事件所暗示的重Higgsino暗物质，在最小超对称SU(5)中通过GUT阈值修正实现统一，抑制六维质子衰变，并使五维衰变p→K+ν̄寿命落入下一代实验探测范围。
AI 中文摘要
最近报道的LUX-ZEPLIN（LZ）事件重新引起了人们对非弹性Higgsino暗物质的兴趣。虽然弱尺度Higgsino为该事件提供了简单的解释，但这种情况与IceCube关于太阳中暗物质捕获和湮灭的约束存在冲突。这种冲突可以通过质量约为$10^5$ GeV且中性态质量劈裂约为$\backsimeq 400$ keV的更重的Higgsino来避免，这反过来又指向约$10^7$ GeV的gaugino质量。如此重的超对称谱通常被认为不利于超对称大统一理论（GUTs），因为它往往会恶化规范耦合统一并降低统一尺度，可能导致过快的质子衰变。在这项工作中，我们在最小超对称SU(5)中重新审视了这一预期，考虑了GUT尺度阈值修正。我们表明，当伴随Higgs自耦合较小时，由此产生的统一条件允许SU(5)规范玻色子保持足够重，从而抑制六维质子衰变。同时，色三重态Higgs质量可以保持在常规GUT尺度附近，$M_{H_C}\sim 10^{16}$ GeV，特别是当gluino明显重于wino时。值得注意的是，在这一区域，五维衰变模式$p\to K^+\bar\nu$的寿命可以在下一代质子衰变搜索（包括Hyper-Kamiokande、JUNO和DUNE）的探测范围内。我们还讨论了可以产生所需超对称质量谱的超对称破缺情景。
英文摘要
The recently reported LUX-ZEPLIN (LZ) event has renewed interest in inelastic Higgsino dark matter. While a weak-scale Higgsino provides a simple interpretation of the event, such a scenario is in tension with the IceCube bound from dark-matter capture and annihilation in the Sun. This tension can be avoided for a much heavier Higgsino, with a mass of order $10^5$ GeV and a neutral-state mass splitting of $\simeq 400$ keV, which in turn points to gaugino masses around $10^7$ GeV. Such a heavy supersymmetric spectrum is often thought to be unfavorable for supersymmetric grand unified theories (GUTs), since it tends to worsen gauge coupling unification and lower the unification scale, potentially leading to excessively rapid proton decay. In this work, we revisit this expectation in minimal supersymmetric SU(5), taking into account the GUT-scale threshold corrections. We show that the resulting unification conditions allow the SU(5) gauge bosons to remain sufficiently heavy when the adjoint-Higgs self-coupling is small, thereby suppressing dimension-six proton decay. At the same time, the color-triplet Higgs mass can remain near the conventional GUT scale, $M_{H_C}\sim 10^{16}$ GeV, particularly when the gluino is significantly heavier than the wino. Remarkably, in this region the dimension-five decay mode $p\to K^+\barν$ can have a lifetime within the reach of next-generation proton-decay searches, including Hyper-Kamiokande, JUNO, and DUNE. We also discuss supersymmetry-breaking scenarios that can give rise to the required supersymmetric mass spectrum.
Comments26 pages, 5 figures
