GmSUGRA中的压缩bino-wino暗物质与LHC软轻子搜索

中文摘要 AI 辅助

对电弱超对称粒子的搜索仍然是LHC计划的重要组成部分，因为质量在几百GeV量级的中性ino和chargino在压缩谱中仍然与当前的约束相容。Run-2对“黄金通道”$pp\to\widetilde\chi_2^0\widetilde\chi_1^\pm\to\widetilde\chi_1^0 Z^{(*)}\widetilde\chi_1^0 W^{\pm(*)}$的搜索在部分软双轻子和三轻子数据中报告了轻微的超额，相应的简化模型解释强调$m_{\widetilde\chi_2^0}\simeq m_{\widetilde\chi_1^\pm}\gtrsim200$~GeV且中性ino质量差接近$20$~GeV。我们在具有广义最小超引力（GmSUGRA）边界条件的最小超对称标准模型（MSSM）中研究这种配置，并施加与谱相关的Higgs、味、对撞机、遗迹密度和直接探测约束。对于$\mu$的两种符号，与Planck实验相容的解包含一个质量约为$260$--$266$~GeV的几乎纯bino $\widetilde\chi_1^0$和一个质量接近$280$~GeV的近乎简并的wino-like $\widetilde\chi_2^0/\widetilde\chi_1^\pm$对。由此产生的质量差$\Delta m_{21}\simeq18.5$--$19.1$~GeV位于ATLAS和CMS软轻子搜索探测的质量差区域，并使$Z^{(*)}/W^{(*)}$衰变低于壳上规范玻色子阈值。相同的压缩层级在冻结期间保持wino态热布居，因此bino-wino共湮灭产生的neutralino遗迹丰度与Planck实验一致，同时幸存的解仍与直接探测实验界限相容。因此，GmSUGRA边界条件提供了与LHC软轻子通道相关的压缩bino-wino谱的高能标实现。

英文摘要

The search for electroweak supersymmetric particles remains an important part of the LHC program since neutralinos and charginos with masses around a few hundred GeV are still compatible with the present constraints in compressed spectra. Run-2 searches for the ``golden channel'', $pp\to\widetildeχ_2^0\widetildeχ_1^\pm\to\widetildeχ_1^0 Z^{(*)}\widetildeχ_1^0 W^{\pm(*)}$, have reported mild excesses in parts of the soft two- and three-lepton data, with the corresponding simplified-model interpretations emphasizing $m_{\widetildeχ_2^0}\simeq m_{\widetildeχ_1^\pm}\gtrsim200$~GeV and a neutralino mass difference near $20$~GeV. We study this configuration in the Minimal Supersymmetric Standard Model (MSSM) with the Generalized minimal Supergravity (GmSUGRA) boundary conditions, imposing the Higgs, flavor, collider, relic-density and direct-detection constraints relevant to the spectrum. For both signs of $μ$, the solutions compatible with the Planck experiment contain an almost pure bino $\widetildeχ_1^0$ with mass about $260$--$266$~GeV and a nearly degenerate wino-like $\widetildeχ_2^0/\widetildeχ_1^\pm$ pair near $280$~GeV. The resulting splitting, $Δm_{21}\simeq18.5$--$19.1$~GeV, lies in the mass-difference region probed by the ATLAS and CMS soft-lepton searches and places the $Z^{(*)}/W^{(*)}$ decays below the on-shell gauge-boson thresholds. The same compressed hierarchy keeps the wino states thermally populated during freeze-out, so bino-wino coannihilation yields a neutralino relic abundance consistent with the Planck experiment while the surviving solutions remain compatible with the direct-detection experimental bounds. Thus, the GmSUGRA boundary conditions provide a high-scale realization of the compressed bino-wino spectrum relevant to the LHC soft-lepton channel.

发表机构

• Zhejiang Normal University（浙江师范大学）
• Khazar University（阿塞拜疆大学）
• Institute of Theoretical Physics, Chinese Academy of Sciences（中国科学院理论物理研究所）
• University of Chinese Academy of Sciences（中国科学院大学）
• Henan Normal University（河南师范大学）
• Federal Urdu University of Arts, Science and Technology（联邦乌尔都艺术、科学与技术大学）
• Institute of High Energy Physics, Chinese Academy of Sciences（中国科学院高能物理研究所）

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