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arXiv 1503.01656hep-ph
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在SM和2 HDM中通过胶子融合产生Higgs和Z玻色子

Higgs and Z boson associated production via gluon fusion in the SM and the 2HDM

B. Hespel, F. Maltoni, E. Vryonidou

摘要:

我们分析了在标准模型和更高的LHC中通过重夸克环产生的希格斯和$Z$玻色子。我们首先回顾了玻恩$2\to 2$产生的主要特征,特别讨论了高能行为,角分布和$Z$玻色子极化。然后,我们考虑额外的QCD辐射的影响所描述的$2 \to 3$回路矩阵元素,并发现它们占主导地位,在高希格斯横动量。我们展示了如何合并样本的0-和1-喷流的多重性,匹配到一个部分子淋浴可以提供一个可靠的描述差分分布在$ZH$生产。除了标准模型的研究,在一个通用的两个希格斯双重模型的结果,并提出了一套具有代表性的和实验可行的基准$Zh^0$,$ZH^0$和$ZA^0$生产。我们观察到,出现各种有趣的功能,无论是由于共振增强的横截面或共振和非共振贡献之间的干涉图案。

英文摘要:

We analyse the associated production of Higgs and $Z$ boson via heavy-quark loops at the LHC in the Standard Model and beyond. We first review the main features of the Born $2\to 2$ production, and in particular discuss the high-energy behaviour, angular distributions and $Z$ boson polarisation. We then consider the effects of extra QCD radiation as described by the $2 \to 3$ loop matrix elements, and find that they dominate at high Higgs transverse momentum. We show how merged samples of 0-- and 1--jet multiplicities, matched to a parton shower can provide a reliable description of differential distributions in $ZH$ production. In addition to the Standard Model study, results in a generic two-Higgs-doublet-model are obtained and presented for a set of representative and experimentally viable benchmarks for $Zh^0$, $ZH^0$ and $ZA^0$ production. We observe that various interesting features appear either due to the resonant enhancement of the cross-section or to interference patterns between resonant and non-resonant contributions.

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