arXiv 2407.012102024-07-01hep-ph

最小超对称标准模型及其非全纯扩展中的希格斯衰变到Zγ

Higgs Decay to $Zγ$ in the Minimal Supersymmetric Standard Model and Its Nonholomorphic Extension

Sajid Israr, Muhammad Rehman

AI总结：

本文在MSSM及其非全纯扩展NHSSM中研究希格斯衰变h→Zγ，发现MSSM贡献可将标准模型与实验值的偏差从1.7σ降至1σ以内，而NHSSM贡献可忽略。

摘要：

CMS和ATLAS最近对$h \rightarrow Z \gamma$的测量显示出超出标准模型（SM）预言的过量，暗示存在新物理。在这项工作中，我们在最小超对称标准模型（MSSM）及其非全纯扩展NHSSM中研究$h \rightarrow Z \gamma$衰变。计算使用FeynArts/FormCalc设置进行，利用已有的MSSM模型文件，并在{\tt SARAH}的支持下生成NHSSM模型文件。在允许的参数空间中，MSSM对$h \rightarrow Z \gamma$的贡献可以显著超过标准模型预言，达到$\Gamma(h \rightarrow Z \gamma)= 9.77 \times 10^{-6} \text{GeV}$的值，从而使$\Gamma(h \rightarrow Z \gamma)$更接近实验值。标准模型预言值与实验值偏离$1.7 \sigma$。然而，MSSM的贡献可以将这一偏离减小到小于$1 \sigma$。相比之下，NHSSM的贡献仍然可以忽略不计，并未对$h \rightarrow Z \gamma$衰变宽度产生可观的修正。

英文摘要：

Recent measurements of $ h \rightarrow Z γ$ from CMS and ATLAS indicate an excess over Standard Model (SM) predictions, suggesting the presence of new physics. In this work, we investigate the $ h \rightarrow Z γ$ decay within the minimal supersymmetric standard model (MSSM) and its nonholomorphic extension, the NHSSM. Calculations are performed using the FeynArts/FormCalc setup, utilizing the pre-existing model file for MSSM and generating the NHSSM model file with the support of {\tt SARAH}. In the allowed parameter space, MSSM contributions to $h \rightarrow Z γ$ can significantly surpass SM predictions reaching to the value $Γ(h \rightarrow Z γ)= 9.77 \times 10^{-6} \text{GeV}$, thereby bringing $ Γ(h \rightarrow Z γ) $ closer to the experimental value. The SM predicted value deviates from the experimental value by $1.7 σ$. However, the MSSM contributions can reduce this deviation to less than $1 σ$. In contrast, NHSSM contributions remain negligible and do not produce sizable corrections to the $ h \rightarrow Z γ$ decay width.

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