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arXiv 2007.08542hep-ph
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Higgs-顶夸克相互作用的间接$\mathcal{CP}$探测:当前的LHC限制和未来的机会

Indirect $\mathcal{CP}$ probes of the Higgs-top-quark interaction: current LHC constraints and future opportunities

Henning Bahl, Philip Bechtle, Sven Heinemeyer, Judith Katzy, Tobias Klingl, Krisztian Peters, Matthias Saimpert, Tim Stefaniak, Georg Weiglein

摘要:

希格斯玻色子与标准模型粒子耦合时的$\mathcal{CP}$结构是希格斯玻色子最重要的性质之一,但尚未得到高精度的约束。在这项研究中,所有相关的包容性和差分希格斯玻色子测量的ATLAS和CMS实验被用来约束$\mathcal{CP}$的顶部汤川相互作用的性质。模型的依赖性的约束进行了研究,先后允许新的物理贡献的耦合的希格斯玻色子玻色子的大规模矢量玻色子,光子,胶子。在最一般的情况下,我们发现,目前的数据仍然允许一个显着的$\mathcal{CP}$奇组件的顶部汤川耦合。此外,我们探索的前景,以进一步限制$\mathcal{CP}$属性的这种耦合与未来的LHC数据,通过确定$tH$生产率独立于可能伴随的变化的$t\bar t H$率。这是通过仔细选择有区别的可观测量来实现的。在HL-LHC中,我们发现在标准模型速率下产生$tH$的证据可以在希格斯粒子到双光子衰变通道中单独实现。

英文摘要:

The $\mathcal{CP}$ structure of the Higgs boson in its coupling to the particles of the Standard Model is amongst the most important Higgs boson properties which have not yet been constrained with high precision. In this study, all relevant inclusive and differential Higgs boson measurements from the ATLAS and CMS experiments are used to constrain the $\mathcal{CP}$-nature of the top-Yukawa interaction. The model dependence of the constraints is studied by successively allowing for new physics contributions to the couplings of the Higgs boson to massive vector bosons, to photons, and to gluons. In the most general case, we find that the current data still permits a significant $\mathcal{CP}$-odd component in the top-Yukawa coupling. Furthermore, we explore the prospects to further constrain the $\mathcal{CP}$ properties of this coupling with future LHC data by determining $tH$ production rates independently from possible accompanying variations of the $t\bar t H$ rate. This is achieved via a careful selection of discriminating observables. At the HL-LHC, we find that evidence for $tH$ production at the Standard Model rate can be achieved in the Higgs to diphoton decay channel alone.

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