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arXiv 2002.06034hep-exhep-ph
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在CLIC对不可见希格斯玻色子衰变的敏感性

Sensitivity to invisible Higgs boson decays at CLIC

Krzysztof Mekala, Aleksander Filip Zarnecki, Bohdan Grzadkowski, Michal Iglicki

摘要:

我们研究了在380 GeV和1.5 TeV的CLIC上测量不可见的希格斯玻色子衰变的可能性。分析是基于WHIZARD事件生成和快速模拟CLIC检测器响应DELPHES。我们考虑了$e^+e^-$背景过程,但也考虑了相关的$γγ$和$γe^\pm$相互作用。由两步分析组成的方法用于优化信号和背景过程之间的分离。首先,一组预选削减应用,然后,多变量分析方法,以优化观察的意义。我们估计了125 GeV的希格斯玻色子的不可见衰变的预期极限,以及产生额外的中性类希格斯标量的截面极限,假设其不可见衰变,作为其质量的函数。提取模型无关的分支比和截面限制,然后解释的框架下的矢量费米子暗物质模型设置限制的混合角之间的SM-类希格斯玻色子和新的标量的“暗扇区”。

英文摘要:

We studied the possibility of measuring invisible Higgs boson decays at CLIC running at 380 GeV and 1.5 TeV. The analysis is based on the WHIZARD event generation and fast simulation of the CLIC detector response with DELPHES. We considered $e^+e^-$ background processes but also relevant $γγ$ and $γe^\pm$ interactions. The approach consisting of a two step analysis was used to optimize separation between signal and background processes. First, a set of preselection cuts was applied; then, multivariate analysis methods were employed to optimise the significance of observations. We estimated the expected limits on the invisible decays of the 125 GeV Higgs boson, as well as the cross section limits for production of an additional neutral Higgs-like scalar, assuming its invisible decays, as a function of its mass. Extracted model-independent branching ratio and cross section limits were then interpreted in the framework of the vector-fermion dark matter model to set limits on the mixing angle between the SM-like Higss boson and the new scalar of the "dark sector".

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