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arXiv 1209.4081hep-ph
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四代背景下的125个GeV希格斯粒子，具有2个希格斯双重态

The 125 GeV Higgs in the context of four generations with 2 Higgs doublets

Michael Geller, Shaouly Bar-Shalom, Gad Eilam, Amarjit Soni

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9 pages, 9 figures, version as published in PRD
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摘要：

我们解释了最近发现的一个125 GeV的希格斯类态的背景下，一个沉重的第四代连续的费米子，其中一个希格斯双偶只耦合到第四代费米子，而第二个双偶耦合到较轻的费米子的第1-第3家庭的两个希格斯双模型。这个模型的目的是为了适应第四代费米子的明显的沉重，并有效地解决低能量的动力学电弱对称性破缺的情况下的现象。因此，该模型的物理希格斯态被视为主要是第四代费米子的复合物。我们发现，当tanβ~ O（1）时，最轻的Higgs粒子是最近发现的125 GeV自旋零粒子的一个很好的候选者，对于典型的第四代费米子质量为M_{4G} = 400 - 600 GeV，并且在右手夸克扇区有大的t-t '混合.这反过来又导致BR（t' -> t h）~ O（1），这极大地改变了t'的衰变模式.我们还发现，基于当前的Higgs数据，这两个Higgs双重态模型一般预测在pp -> h -> tau-tau通道中的产生率增加（与SM相比），而VV -> h -> gamma和pp -> V -> Vh -> Vbb通道的产生率减少。最后，更重的CP偶Higgs被排除在当前的数据中，直到mH ~ 500 GeV，而赝标态A可以轻至130 GeV。这些较重的希格斯态和一些希格斯产生通道中的SM的预期偏差可以进一步排除或用更多的数据发现。

英文摘要：

We interpret the recent discovery of a 125 GeV Higgs-like state in the context of a two Higgs doublets model with a heavy 4th sequential generation of fermions, in which one Higgs doublet couples only to the 4th generation fermions, while the second doublet couples to the lighter fermions of the 1st-3rd families. This model is designed to accommodate the apparent heaviness of the 4th generation fermions and to effectively address the low-energy phenomenology of a dynamical electroweak symmetry breaking scenario. The physical Higgs states of the model are, therefore, viewed as composites primarily of the 4th generation fermions. We find that the lightest Higgs, h, is a good candidate for the recently discovered 125 GeV spin-zero particle, when tanβ~ O(1), for typical 4th generation fermion masses of M_{4G} = 400 -600 GeV, and with a large t - t' mixing in the right-handed quarks sector. This, in turn, leads to BR(t' -> t h) ~ O(1), which drastically changes the t' decay pattern. We also find that, based on the current Higgs data, this two Higgs doublet model generically predicts an enhanced production rate (compared to the SM) in the pp -> h -> tau tau channel and a reduced VV -> h -> gamma gamma and pp -> V -> Vh -> Vbb ones. Finally, the heavier CP-even Higgs is excluded by the current data up to m_H ~ 500 GeV, while the pseudoscalar state, A, can be as light as 130 GeV. These heavier Higgs states and the expected deviations from the SM in some of the Higgs production channels can be further excluded or discovered with more data.

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