arXiv 2412.005232024-12hep-phhep-ex

在双希格斯二重态模型中关联 $A \to γγ$ 与电偶极矩：基于95 GeV和152 GeV双光子超出的研究

Correlating $A \to γγ$ with electric dipole moments in the two Higgs doublet model in light of the diphoton excesses at 95 GeV and 152 GeV

Sumit Banik, Guglielmo Coloretti, Andreas Crivellin, Howard E. Haber

备注：: 14 pages, 3 figures; V3: Version accepted for publication in PRD

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AI总结：

在CP破坏的味对齐双希格斯二重态模型中，研究新标量A衰变到光子与电偶极矩的关联，发现95 GeV和152 GeV双光子超出可由A解释，并满足电子EDM约束，且98 GeV的H可解释LEP超出。

摘要：

我们研究了在CP破坏的味对齐双希格斯二重态模型（2HDM）中，新标量玻色子衰变到光子与电偶极矩（EDM）之间的关联。在希格斯基 $\$\{H}_1, {H}_2\}\$ 下工作较为方便，其中只有第一个希格斯二重态场 ${H}_1$ 获得真空期望值。鉴于LHC希格斯数据与标准模型（SM）预言高度一致，2HDM的参数符合希格斯对齐极限。在该参数区域，观测到的类SM希格斯玻色子几乎完全存在于 ${H}_1$ 中，而另外两个物理中性标量几乎完全存在于 ${H}_2$ 中，它们是近似的CP本征态（分别记为CP偶的 $H$ 和CP奇的 $A$）。在希格斯基中，标量势项 $\bar{Z}_7 {H}_1^\dagger {H}_2 {H}_2^\dagger {H}_2+{\rm h.c.}$ 控制着带电希格斯圈对 $H$ 和 $A$ 衰变到光子的贡献。如果 $\text{Re } \bar{Z}_7 \\, \text{Im } \bar{Z}_7 \neq 0$，则存在CP破坏效应，允许 $H^+ H^- A$ 耦合，这可以产生可观的 $A\toγγ$ 分支比。这些CP破坏效应也会产生电子、中子和质子的非零EDM。我们针对 $m_{A}=95$ GeV 和 $m_{A}=152$ GeV 的情况检查了这些关联，在这两个质量处LHC观测到了双光子谱中的有趣超出。这些超出可以通过 $A$ 的衰变来解释，同时在与电子EDM的实验约束一致的参数空间区域中，未来的中子和质子EDM测量可以检验这些区域。这为有趣的可能性提供了空间：95 GeV双光子超出可以归因于 $A$，而 $m_H\simeq 98$ GeV 可以解释LEP在 $e^+e^-\to ZH$（其中 $H\to b\bar b$）中的最佳拟合超出。

英文摘要：

We examine the correlations between new scalar boson decays to photons and electric dipole moments (EDMs) in the CP-violating flavor-aligned two-Higgs-doublet model (2HDM). It is convenient to work in the Higgs basis $\{{H}_1, {H}_2\}$ where only the first Higgs doublet field ${H}_1$ acquires a vacuum expectation value. In light of the LHC Higgs data, which agree well with Standard Model (SM) predictions, it follows that the parameters of the 2HDM are consistent with the Higgs alignment limit. In this parameter regime, the observed SM-like Higgs boson resides almost entirely in ${H}_1$, and the other two physical neutral scalars, which reside almost entirely in ${H}_2$, are approximate eigenstates of CP (denoted by the CP-even $H$ and the CP-odd $A$). In the Higgs basis, the scalar potential term $\bar{Z}_7 {H}_1^\dagger {H}_2 {H}_2^\dagger {H}_2+{\rm h.c.}$ governs the charged-Higgs loop contributions to the decay of $H$ and $A$ to photons. If $ \text{Re } \bar{Z}_7 \, \text{Im } \bar{Z}_7 \neq 0$, then CP-violating effects are present and allow for an $H^+ H^- A$ coupling, which can yield a sizable branching ratio for $A\toγγ$. These CP-violating effects also generate non-zero EDMs for the electron, the neutron and the proton. We examine these correlations for the cases of $m_{A}=95$ GeV and $m_{A}=152$ GeV where interesting excesses in the diphoton spectrum have been observed at the LHC. These excesses can be explained via the decay of $A$ while being consistent with the experimental bound for the electron EDM in regions of parameter space that can be tested with future neutron and proton EDM measurements. This allows for the interesting possibility where the 95 GeV diphoton excess can be identified with $A$, while $m_H\simeq 98$ GeV can account for the best fit to the LEP excess in $e^+e^-\to ZH$ with $H\to b\bar b$.

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英文摘要：

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