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Higgs and dark matter physics in the type-II two-Higgs-doublet model inspired by E 6 GUT

机译:受E 6 GUT启发的II型两希格斯双峰模型中的希格斯和暗物质物理学

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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.
机译:我们在E 6大统一理论(GUT)的启发下,在具有额外的U(1)H规范对称性的II型两希格斯双峰模型(2HDM)中研究希格斯和暗物质物理学。从自下而上的方法的角度来看,额外的U(1)H规对称性在避免一般2HDM中由中性希格斯玻色子介导的树级风味改变中性电流方面起着至关重要的作用。在具有II型Yukawa耦合的U(1)H规范对称性模型中,我们必须引入在U(1)H规范对称性以及标准模型(SM)下带电的其他手性费米子规范对称性以消除手征规范异常。对于U(1)H电荷分配和其他事项,我们采用了受E 6 GUT启发的那些:带有非平凡U(1)H电荷的夸克和轻子状费米子。我们讨论了它们对物理可观察物的贡献,例如希格斯物理学的测量和电弱相互作用,并研究了与实验结果的一致性。此外,我们可以在电弱对称破坏后找到额外的中性粒子,如SM中微子,并且由于U(1)H对称破坏后的剩余对称性,它们可以保持稳定。我们还将讨论该暗物质候选物的热文物密度和(间接)检测。

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