论文标题
希格斯 - 波森在隐藏扇区上可见和看不见的约束
Higgs-boson visible and invisible constraints on hidden sectors
论文作者
论文摘要
我们研究了隐藏扇区与发现的希格斯玻色子$ h_ {125} $之间相互作用的影响，允许$ h_ {125} $的其他隐形衰减通道。我们对Higgs-Boson横截面的测量结果执行$χ^2 $ fits，这是看不见的分支比和耦合修饰符的不同组合的函数，与标准模型的预测相比，后者量化了$ H_ {125} $的耦合的修改。我们就耦合修饰符的排除限制和$ H_ {125} $的隐形分支比率提出了通用结果。此外，我们将结果应用于包含隐藏扇区的各种具体模型实现：Higgs和Singlet-Portal情景中的暗物质，具有（Pseudo）Nambu-Goldstone Bosons和两个Higgs Doublet扩展的模型。我们工作的主要结论之一是，在一类广泛的模型中，$ h_ {125} $的横截面的测量所产生的间接限制可提供对隐形Higgs-Boson分支比率的强大约束，而与从$ h_ _ _ 125 $ h_ _ 125 $ n的搜索中获得的直接限制相比，获得的直接限制。但是，我们证明了$ H_ {125} $的隐形衰减模式的存在也可以打开参数空间区域，否则由于间接约束而将其排除。作为我们分析的副产品，我们表明，鉴于LZ协作的新结果，在最简单的HIGGS-PORTAL情况下，在标准假设中排除了Fermionic DM候选者。
We investigate the impact of interactions between hidden sectors and the discovered Higgs boson $h_{125}$, allowing for additional invisible decay channels of $h_{125}$. We perform $χ^2$-fits to the measurements of the Higgs-boson cross sections as a function of the invisible branching ratio and different combinations of coupling modifiers, where the latter quantify modifications of the couplings of $h_{125}$ compared to the predictions of the Standard Model. We present generic results in terms of exclusion limits on the coupling modifiers and the invisible branching ratio of $h_{125}$. Additionally, we apply our results to a variety of concrete model realizations containing a hidden sector: dark matter within Higgs- and singlet-portal scenarios, models featuring (pseudo) Nambu-Goldstone bosons and two Higgs doublet extensions. One of the main conclusions of our work is that in a wide class of models the indirect constraints resulting from the measurements of the cross sections of $h_{125}$ provide substantially stronger constraints on the invisible Higgs-boson branching ratio compared to the direct limits obtained from searches for the invisible decay of $h_{125}$. However, we demonstrate that the presence of an invisible decay mode of $h_{125}$ can also open up parameter space regions which otherwise would be excluded as a result of the indirect constraints. As a byproduct of our analysis, we show that in light of the new results from the LZ collaboration a fermionic DM candidate within the simplest Higgs-portal scenario is ruled out under standard assumptions.
