AI 中文总结
本研究在1.5 TeV、积分亮度500 fb⁻¹的缪子对撞机上，通过单光子加缺失能量信号，探测类轴子粒子-光子-暗光子相互作用，极化束流配置灵敏度达O(10⁻⁵) GeV⁻¹，非极化配置达O(10⁻⁴) GeV⁻¹，可在宽质量范围实现灵敏探测。
AI 中文摘要
暗轴子门户是超出标准模型（SM）的新物理的动机充分的框架，其中类轴子粒子（ALP）可同时耦合光子与暗光子，产生独特的对撞机信号。本研究在质心能量1.5 TeV、积分亮度ℒ=500 fb⁻¹的缪子对撞机上，针对极化束流配置P(μ⁺,μ⁻)=(-100%,+100%)与非极化束流配置P(μ⁺,μ⁻)=(0,0)，通过μ⁺μ⁻→aγ'且a→γγ'产生的单光子通道，研究对a-γ-γ'相互作用的灵敏度，采用探测器级模拟。该信号特征为单高能光子伴随暗光子逃逸探测形成的缺失能量。对于P(μ⁺,μ⁻)=(-100%,+100%)，在ALP质量范围1 GeV≤mₐ≤1200 GeV内，预计灵敏度可达O(10⁻⁵) GeV⁻¹量级；对于P(μ⁺,μ⁻)=(0,0)，在相同ALP质量范围内，预计灵敏度可达O(10⁻⁴) GeV⁻¹量级。这些结果表明，缪子对撞机的单光子信号可在宽质量范围内灵敏探测a-γ-γ'相互作用。
英文摘要
The dark axion portal provides a well-motivated framework for new physics beyond the Standard Model (SM), in which an axion-like particle (ALP) couples simultaneously to a photon and a dark photon, leading to distinctive collider signatures. In this work, we investigate the sensitivity to the $a$--$γ$--$γ'$ interaction via the mono-photon channel arising from $μ^{+}μ^{-} \to a γ'$ with $a \to γγ'$ at the $1.5~\mathrm{TeV}$ muon collider with an integrated luminosity of $\mathcal{L}=500~\mathrm{fb}^{-1}$ for the polarized and unpolarized beam configurations, $P(μ^+,μ^-)=(-100\%,+100\%)$ and $P(μ^+,μ^-)=(0,0)$, using detector-level simulation. The signal is characterized by a single energetic photon accompanied by missing energy as the dark photons escape detection. The projected sensitivity reaches the $\mathcal{O}(10^{-5})~\mathrm{GeV}^{-1}$ level for ALP masses in the range $1~\mathrm{GeV}\leq m_a\leq1200~\mathrm{GeV}$ for $P(μ^+,μ^-)=(-100\%,+100\%)$, while for $P(μ^+,μ^-)=(0,0)$ the projected sensitivity reaches the $\mathcal{O}(10^{-4})~\mathrm{GeV}^{-1}$ level for the same ALP mass range. These results demonstrate that the mono-photon signature at a muon collider provides a sensitive probe of the $a$--$γ$--$γ'$ interaction over a wide mass range.
Comments19 pages, 7 figures, 3 tables, accepted for publication in Phys. Rev. D
