AI 中文总结
研究在汤川型II实现中区分N2HDM和2HDMS模型，通过推导希格斯三线性耦合解析表达式，在高亮度LHC四顶产生及未来高能正负电子对撞机希格斯对产生的环境中研究现象学，量化区分潜力，提供通用区分框架。
AI 中文摘要
我们研究了在汤川型II实现中实验区分次两希格斯二重态模型（N2HDM）和带复单态的两希格斯二重态模型（2HDMS）的前景。这两个模型都能成功容纳报告的约95 GeV的希格斯玻色子超量，同时满足当前理论和实验约束，对观测到的希格斯谱和信号强度预测非常相似。我们分析了如何通过对标量势和CP奇异性部分敏感的可观测量来区分它们。推导了希格斯三线性耦合的解析表达式，展示了2HDMS额外三次相互作用引起的特征贡献。我们在两个互补的对撞机环境中研究了相应的现象学：高亮度LHC上的四顶产生，探测不同的赝标量部分；以及未来高能正负电子对撞机上的希格斯对产生，直接探测希格斯三线性耦合。我们通过引入两个模型之间2σ差异所需偏离N2HDM极限的最小偏差来量化区分这两个模型的潜力。虽然我们的数值分析集中在描述95 GeV超量的基准情景上，但所提出的方法为未来对撞机上单态扩展希格斯部分的区分提供了一个通用框架。
英文摘要
We investigate the prospects for experimentally distinguishing the Next-to-Two-Higgs-Doublet Model (N2HDM) and the Two-Higgs-Doublet Model with a Complex Singlet (2HDMS) in the Yukawa type II realization. Both models can successfully accommodate the reported Higgs-boson excesses around 95 GeV while satisfying current theoretical and experimental constraints, leading to very similar predictions for the observed Higgs spectrum and signal strengths. We analyze how they can nevertheless be discriminated through observables sensitive to the scalar potential and the CP-odd sector. Analytical expressions for the trilinear Higgs couplings are derived, exhibiting characteristic contributions induced by the additional cubic interactions of the 2HDMS. We study the corresponding phenomenology in two complementary collider environments: four-top production at the High-Luminosity LHC, probing the different pseudoscalar sectors. In a second step we analyze Higgs pair production at a future high-energy $e^+e^-$ collider, providing direct sensitivity to the trilinear Higgs couplings. We quantify the potential to distinguish the two models by introducing the minimum deviation from the N2HDM limit required for a $2σ$ difference between the two models. Although our numerical analysis focuses on benchmark scenarios describing the 95 GeV excesses, the proposed approach provides a general framework for discriminating between singlet-extended Higgs sectors at future colliders.
Comments52 pages, 23 figures
