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arXiv 1303.5699hep-ph
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最小伴随SU(5)xZ_4 GUT模型

The minimal adjoint-SU(5)xZ_4 GUT model

D. Emmanuel-Costa, C. Simoes, M. Tortola

摘要:

本文研究了具有味对称性的伴随SU(5)模型在Z_4群上的推广。引入Z_4对称性的目的是将上夸克和下夸克的质量矩阵引入到最近邻相互作用形式。由于SU(5)规范群中的离散对称性,带电轻子质量矩阵也得到了同样的形式。在这个模型中,轻中微子通过I型、III型和单圈辐射跷跷板机制获得质量,这些机制分别通过伴随的费米子24场的单重态、三重态和八重态实现。结果表明,中微子现象迫使至少三个24费米子多重态的引入。对称性SU(5)xZ_4只允许有效中微子质量矩阵有两个可行的零织构。结果表明,在轻中微子质谱中,一种织构只与正态结构相容,另一种织构只与反态结构相容。最后还论证了Z_4通过在树能级上交换色Higgs三重态来冻结质子衰变的可能性。

英文摘要:

An extension of the adjoint SU(5) model with a flavour symmetry based on the Z_4 group is investigated. The Z_4 symmetry is introduced with the aim of leading the up- and down-quark mass matrices to the Nearest-Neighbour-Interaction form. As a consequence of the discrete symmetry embedded in the SU(5) gauge group, the charged lepton mass matrix also gets the same form. Within this model, light neutrinos get their masses through type-I, type-III and one-loop radiative seesaw mechanisms, implemented, respectively, via a singlet, a triplet and an octet from the adjoint fermionic 24 fields. It is demonstrated that the neutrino phenomenology forces the introduction of at least three 24 fermionic multiplets. The symmetry SU(5)xZ_4 allows only two viable zero textures for the effective neutrino mass matrix. It is showed that one texture is only compatible with normal hierarchy and the other with inverted hierarchy in the light neutrino mass spectrum. Finally, it is also demonstrated that Z_4 freezes out the possibility of proton decay through exchange of colour Higgs triplets at tree-level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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