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arXiv 1507.02101hep-ph
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受E6启发的复合Higgs模型

E6 inspired composite Higgs model

R. Nevzorov, A. W. Thomas

摘要:

本文考虑了一个嵌入到基于E_6规范群的大统一理论(GUT)中的复合Higgs模型。E_6激发的复合Higgs模型(E6 CHM)的唯象可行性意味着不同重子数或轻子数的标准模型(SM)基本费米子应该来源于E_6的不同27表象。我们提出了一个六维轨道大统一理论模型,其中E_6规范对称性被破缺为SM规范群,从而使体27重态发生适当的分裂。在这个模型中,强耦合扇区被局域在其中一个膜上,并具有SU(6)全局对称性,包含SU(3)_C \times SU(2)_W \times U(1)_Y子群。在这种情况下,如果右手顶夸克是一个复合态,并且基本扇区包含SM之外的额外奇异物质,从而确保异常抵消,则可以实现近似规范耦合统一。在这个模型中,近似的SU(6)对称性在低能量下的破坏导致了一组伪Nambu-Goldstone态,其中包括一个Higgs双重态和一个标量色三重态。我们讨论了E6 CHM中SM费米子质量的产生。TeV尺度的矢量奇异夸克和标量色三重态的存在可能提供可以在LHC上观察到的壮观的新物理信号。

英文摘要:

We consider a composite Higgs model embedded into a Grand Unified Theory(GUT) based on the E_6 gauge group. The phenomenological viability of this E_6 inspired composite Higgs model (E6CHM) implies that standard model (SM) elementary fermions with different baryon or lepton number should stem from different 27 representations of E_6. We present a six-dimensional orbifold GUT model in which the E_6 gauge symmetry is broken to the SM gauge group so that the appropriate splitting of the bulk 27-plets takes place. In this model the strongly coupled sector is localised on one of the branes and possesses an SU(6) global symmetry that contains the SU(3)_C\times SU(2)_W\times U(1)_Y subgroup. In this case the approximate gauge coupling unification can be attained if the right-handed top quark is a composite state and the elementary sector involves extra exotic matter beyond the SM which ensures anomaly cancellation. The breakdown of the approximate SU(6) symmetry at low energies in this model results in a set of the pseudo-Nambu-Goldstone states which include a Higgs doublet and scalar colour triplet. We discuss the generation of the masses of the SM fermions in the E6CHM. The presence of the TeV scale vector-like exotic quarks and scalar colour triplet may provide spectacular new physics signals that can be observed at the LHC.

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