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arXiv 2407.09145hep-ph
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在 $h\ o Zγ$ 和 $h\ oγγ$ 衰变中区分 SMEFT 与 UV 贡献

Disentangling SMEFT and UV contributions in $h\to Zγ$ and $h\toγγ$ decays

Kostas Mantzaropoulos

AI总结:

针对 $h\ oγγ$ 与 $h\ o Zγ$ 信号强度的潜在差异,本文在 SMEFT 中进行模型无关分析,并通过一圈匹配检验各类单场和两场 UV 扩展。

摘要:

LHC 搜索已经表明,Higgs 玻色子衰变为光子对的结果几乎与标准模型(SM)相符,而最近出现了 Higgs 玻色子衰变为一个 $Z$ 玻色子和一个光子的证据。在标准模型有效场论(SMEFT)中,这些衰变在树图层级由同一组 Wilson 系数控制。在本研究中,我们旨在解释 $h\ o γγ$ 与 $h\ o Zγ$ 衰变之间这一潜在差异。我们在 SMEFT 中开展模型无关分析,以确定解释两种信号强度之间所观测差异所需 Wilson 系数的大小和特征。随后,我们采用自上而下的方法,考虑 SM 的所有单场和两场扩展,包括标量和费米子,作为新相互作用的候选。我们使用自动化程序包将这些模型匹配至一圈,并比较各模型关于 $h\ o Zγ$ 的预测。

英文摘要:

LHC searches have revealed that the Higgs boson decay to a photon pair is nearly consistent with the Standard Model (SM), whereas recently, there is evidence for the decay of the Higgs boson to a $Z$-boson and a photon. These decays are governed by the same set of Wilson-coefficients at the tree level in Standard Model Effective Field Theory (SMEFT). In this study, we aim to explain this potential discrepancy between the decays $h\to γγ$ and $h\to Zγ$. We conduct a model-independent analysis in SMEFT to determine the magnitude and features of the Wilson coefficients required to account for the observed distinction between the two signal strengths. Following this, we adopt a top-down approach, considering all single and two field extensions of the SM, including scalars and fermions, as candidates for new interactions. We perform the matching of these models to one loop using automated packages and compare the models' predictions regarding $h\to Zγ$.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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