We constrain the Higgs-portal model employing the vector-boson fusion channel at the LHC. In particular, we include the phenomenologically interesting parameter region near the Higgs resonance, where the Higgs-boson mass is close to the threshold for dark-matter production and a running-width prescription has to be employed for the Higgs- boson propagator. Limits for the Higgs-portal coupling as a function of the dark-matter mass are derived from the CMS search for invisible Higgs-boson decays in vector-boson fusion at 13 TeV. Furthermore, we perform projections for the 14 TeV HL-LHC and the 27 TeV HE-LHC taking into account a realistic estimate of the systematic uncertainties. The respective upper limits on the invisible branching ratio of the Higgs boson reach a level of 2% and constrain perturbative Higgs-portal couplings up to dark-matter masses of about 110 GeV.

中文翻译：

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用矢量玻色子融合探测希格斯门暗物质

我们在 LHC 上使用矢量-玻色子融合通道来约束 Higgs-portal 模型。特别是，我们在希格斯共振附近包括了现象学上有趣的参数区域，其中希格斯玻色子质量接近暗物质产生的阈值，并且必须为希格斯玻色子传播子采用运行宽度处方。作为暗物质质量函数的 Higgs-portal 耦合的极限来自于 CMS 对 13 TeV 向量-玻色子融合中不可见的 Higgs-玻色子衰变的搜索。此外，考虑到系统不确定性的实际估计，我们对 14 TeV HL-LHC 和 27 TeV HE-LHC 进行了预测。