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arXiv 1502.00262hep-phhep-ex
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E_6 GUT激发的II型双Higgs模型中的Higgs和暗物质物理

Higgs and Dark Matter Physics in the Type-II Two-Higgs-Doublet Model inspired by E_6 GUT

P. Ko, Yuji Omura, Chaehyun Yu

摘要:

我们在E_6大统一理论(GUT)的启发下,在具有额外U(1)_H规范对称性的II型双Higgs偶极模型(2 HDM)中研究了Higgs和暗物质物理。从自底向上方法的观点来看,额外的U(1)_H规范对称性在避免一般2 HDMs中由中性希格斯玻色子玻色子介导的树能级味变中性流中起着至关重要的作用。在U(1)_H规范对称性模型中,为了消除手征规范反常,我们必须在U(1)_H规范对称性和标准模型(SM)规范对称性下引入额外的手征费米子。对于U(1)_H荷的分配和额外物质,我们采用E_6大统一理论的启发:带有非平凡U(1)_H荷的额外类夸克费米子和类轻子费米子。我们讨论了它们对物理观测量的贡献,如希格斯物理和电-弱相互作用的测量,并考察了与实验结果的一致性。此外,我们还可以在U(1)H对称性破缺后发现类似SM中微子的额外中性粒子,并且由于U(1)H对称性破缺后的剩余对称性,它们是稳定的。我们还讨论了热遗迹密度和(中)直接检测这个暗物质候选人。

英文摘要:

We study Higgs and dark matter physics in the type-II two-Higgs-doublet model (2HDM) with an extra U(1)_H gauge symmetry, inspired by the E_6 grand unified theory (GUT). From the viewpoint of the bottom-up approach, the additional U(1)_H gauge symmetry plays a crucial role in avoiding the tree-level flavor changing neutral currents mediated by neutral Higgs bosons in general 2HDMs. In the model with U(1)_H gauge symmetry, which has Type-II Yukawa couplings, we have to introduce additional chiral fermions that are charged under the U(1)_H gauge symmetry as well as under the Standard-Model (SM) gauge symmetry in order to cancel chiral gauge anomalies. For the U(1)_H charge assignment and the extra matters, we adopt the ones inspired by the E_6 GUT: the extra quark-like and lepton-like fermions with the non-trivial U(1)_H charges. We discuss their contributions to the physical observables, such as the measurements of Higgs physics and electro-weak interactions, and investigate the consistency with the experimental results. Furthermore, we could find extra neutral particles like the SM neutrinos after the electro-weak symmetry breaking, and they could be stable, because of the remnant symmetry after U(1)_H symmetry breaking. We also discuss the thermal relic density and the (in)direct-detections of this dark matter candidate.

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