近日，南京师范大学Qiulei Wang团队研究了在介子对撞机上用z2偶介质探索亲介子暗物质。这一研究成果于2026年3月22日发表在《中国物理C》杂志上。
银河系中心GeV超额（GCE）仍然是星系内部区域一个引人注目却难以解释的信号。亲缪子暗物质通过一种新媒介子仅与缪子发生相互作用，为解释GCE和暗物质 relic密度提供了可行的方案，同时天然避开了来自直接探测、对撞机搜寻及其他多信使观测的限制。
基于先前全局拟合中确定的可行非共振参数空间，研究组开展了一项综合研究，探讨在未来3 TeV缪子对撞机背景下发现此类亲缪子暗物质的前景，重点关注具有Z2偶宇称媒介子的简化模型。研究组探索了四种不同的搜寻策略：可见的在壳媒介子衰变（μ+μ−γ末态）、不可见的在壳媒介子衰变（单光子加缺失能量）、通过离壳媒介子产生的单光子过程，以及矢量玻色子融合产生过程。通过使用截断计数法进行详细的信号与背景分析，研究组给出了在95%置信度下，七种代表性模型在宽泛媒介子质量范围内的预期排除限制。该结果表明，预期限制覆盖了用于解释GCE的可行参数空间的相当大一部分，从而确立了缪子对撞机作为检验亲缪子暗物质假说的关键性实验装置的地位。
附：英文原文
Title: Exploring muonphilic dark matter with the Z2-even mediator at muon colliders
Author: Wanyun Chen, Haoqi Li, Chih-Ting Lu, Qiulei Wang
Issue&Volume: 2026-03-22
Abstract: The Galactic Center GeV Excess (GCE) remains a compelling but enigmatic signal from the inner region of our galaxy. Muonphilic dark matter (DM), which couples exclusively to muons via a new mediator, provides a viable explanation for the GCE and relic density while naturally evading constraints from direct detection, collider searches and other multi-messenger observations. Based on the viable non-resonant parameter space identified in previous global fits, we perform a comprehensive study exploring the prospects for discovering such muonphilic DM in the context of a future 3 TeV muon collider, focusing on simplified models with a Z2-even mediator. Four distinct search strategies are investigated: visible on-shell mediator decays (μ+μγ final state), invisible on-shell mediator decays (mono-photon plus missing energy), mono-photon production via off-shell mediators, and vector boson fusion production.Through a detailed signal-background analysis using cut-and-count methods, we project the exclusion limits at 95% confidence level for seven representative models across a wide range of mediator masses. Our results demonstrate that the projected limits cover a significant portion of the viable parameter space that explains the GCE, establishing a muon collider as a decisive machine for testing the muonphilic DM hypothesis.
DOI: 10.1088/1674-1137/ae5044
Source: http://hepnp.ihep.ac.cn/article/doi/10.1088/1674-1137/ae5044