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arXiv 1306.2941hep-ph
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Higgs信号强度和耦合的全局拟合以及扩展Higgs扇区的含义

Global fit to Higgs signal strengths and couplings and implications for extended Higgs sectors

G. Belanger, B. Dumont, U. Ellwanger, J. F. Gunion, S. Kraml

摘要:

最新的LHC数据在测量各种希格斯粒子产生和衰变通道的精度上有了相当大的提高。使用ATLAS,CMS和Tevatron的所有可用的公共结果,我们推导出每个最终状态的组合置信水平轮廓的信号强度(胶子融合+ TTH相关的生产)与(矢量玻色子融合+ VH相关的生产)空间。这些“组合信号强度椭圆”可以用一种简单、通用的方式来约束一类非常广泛的新物理模型,其中希格斯玻色子的耦合偏离了标准模型的预测。在这里,我们使用它们来约束约化耦合的希格斯玻色子的上夸克,下夸克/轻子和矢量玻色子对。我们还考虑了新物理学对环诱导的希格斯粒子的胶子-胶子和光子-光子耦合的贡献,以及不可见/不可见的衰变。最后,我们适用于我们的适合一些简单的模型与扩展的希格斯部门,特别是两希格斯双重模型的类型I和类型II,惰性双重模型,和乔治-Machacek三重希格斯模型。

英文摘要:

The most recent LHC data have provided a considerable improvement in the precision with which various Higgs production and decay channels have been measured. Using all available public results from ATLAS, CMS and the Tevatron, we derive for each final state the combined confidence level contours for the signal strengths in the (gluon fusion + ttH associated production) versus (vector boson fusion + VH associated production) space. These "combined signal strength ellipses" can be used in a simple, generic way to constrain a very wide class of New Physics models in which the couplings of the Higgs boson deviate from the Standard Model prediction. Here, we use them to constrain the reduced couplings of the Higgs boson to up-quarks, down-quarks/leptons and vector boson pairs. We also consider New Physics contributions to the loop-induced gluon-gluon and photon-photon couplings of the Higgs, as well as invisible/unseen decays. Finally, we apply our fits to some simple models with an extended Higgs sector, in particular to Two-Higgs-Doublet models of Type I and Type II, the Inert Doublet model, and the Georgi-Machacek triplet Higgs model.

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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