消失的希格斯四次方能标处的重希格斯微子暗物质
Heavy Higgsino Dark Matter at the Scale of the Vanishing Higgs Quartic
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中文总结 AI 辅助
本文提出重希格斯微子暗物质质量与消失的希格斯四次方耦合能标自然关联，通过玻尔兹曼抑制的冻结-进机制产生观测丰度，并受LZ及未来DARWIN/XLZD实验检验。
中文摘要 AI 辅助
标准模型希格斯四次方耦合在$2\sigma$水平下于$10^9-10^{12}$ GeV能标处趋近于零，这表明在该能标处存在一个紫外边界条件$\lambda\simeq0$。在一类动机良好的高能标超对称（SUSY）模型中，四次方耦合在超伴子能标处的树级上自动设为零。希格斯微子可以自然地成为最轻的SUSY粒子，其两个中性Weyl分量足够简并，从而形成一个有效的Dirac费米子，并具有与$Z$玻色子未受抑制的矢量耦合。对于此类希格斯微子暗物质，直接探测要求其质量高于$\sim10^{11}$ GeV，这恰好与消失四次方耦合独立选择的能标相吻合。如此重的希格斯微子无法通过冻结机制产生观测到的遗迹密度。然而，如果其质量超过再加热温度，则可以通过玻尔兹曼抑制的冻结-进机制重现观测到的暗物质丰度。这一情景将暗物质质量与测得的希格斯质量联系起来，其参数空间已受到LUX-ZEPLIN（LZ）实验的约束，并将在DARWIN/XLZD实验中得到决定性检验。最后，我们考虑了具有约$10^7$ GeV量级Majorana规范微子的PeV希格斯微子，这允许对LZ实验的暂定事件进行非弹性希格斯微子解释，同时保持标量超伴子能标与消失希格斯四次方能标之间的联系。
英文摘要
The Standard Model Higgs quartic coupling runs to zero around $10^9-10^{12}$ GeV at $2σ$, suggestive of an ultraviolet boundary condition $λ\simeq0$ at this scale. In a well-motivated class of high-scale supersymmetric (SUSY) models, the quartic is automatically set to zero at tree level at the superpartner scale. The Higgsino can naturally emerge as the lightest SUSY particle, with its two neutral Weyl components sufficiently degenerate to form an effectively Dirac fermion with an unsuppressed vector coupling to the $Z$. For such Higgsino dark matter, direct detection requires a mass above $\sim10^{11}$ GeV, leading to a coincidence with the scale independently selected by the vanishing quartic. Such a heavy Higgsino cannot freeze out with the observed relic density. However, if its mass exceeds the reheating temperature, the observed dark matter abundance can be reproduced through Boltzmann suppressed freeze-in. This scenario connects the dark matter mass to the measured Higgs mass, with a parameter space already constrained by LUX-ZEPLIN (LZ) and which will be decisively tested at DARWIN/XLZD. Finally, we consider PeV Higgsinos with Majorana gauginos of order $10^7$ GeV, permitting an inelastic Higgsino interpretation of the tentative LZ event while retaining the connection between the scalar superpartner scale and the vanishing Higgs quartic scale.
发表机构
- University of Illinois Chicago（伊利诺伊大学芝加哥分校）
- University of Oxford（牛津大学）
机构由 AI 辅助整理，请以论文原文为准。
