Large θ13 in a SUSY SU(5) x T′ model

被引:42
作者
Chen, Mu-Chun [1 ]
Huang, Jinrui [2 ]
Mahanthappa, K. T. [3 ]
Wijangco, Alexander M. [1 ]
机构
[1] Univ Calif Irvine, Dept Phys & Astron, Irvine, CA 92697 USA
[2] Los Alamos Natl Lab, Div Theoret, Los Alamos, NM 87545 USA
[3] Univ Colorado, Dept Phys, Boulder, CO 80309 USA
来源
JOURNAL OF HIGH ENERGY PHYSICS | 2013年 / 10期
基金
美国国家科学基金会;
关键词
Beyond Standard Model; Neutrino Physics; Discrete and Finite Symmetries; GUT; NEUTRINO MASSES; FLAVOR SYMMETRY; HORIZONTAL SYMMETRY; A(4) SYMMETRY; QUARK MASSES; CKM; PREDICTIONS; MATRICES;
D O I
10.1007/JHEP10(2013)112
中图分类号
O412 [相对论、场论]; O572.2 [粒子物理学];
学科分类号
摘要
In the model based on SUSY SU(5) combined with the T' family symmetry, it is shown [1, 2] that fermion mass hierarchy and mixing angles can be naturally generated in both lepton and quark sectors compatible with various experimental measurements. But the predicted value for the non-zero lepton mixing angle of theta(13) similar or equal to theta(c)/3 root 2 contradicts the recent experimental results from Daya Bay and RENO. We propose to introduce one more singlet flavon field in the neutrino sector, and with its additional contribution, we are able to generate the large mixing angle theta(13) similar to 8 degrees - 10 degrees. The analytical expressions of the mixing angles and neutrino masses with the additional flavon field are derived. Our numerical results show that a large region in the model parameter space is allowed for the normal hierarchy case, while a much smaller region is allowed for the inverted hierarchy case. In addition, the predicted value of the solar mixing angle is not affected by the additional singlet contribution. On the other hand, there exists a correlation between 013 value and theta(23) - pi/4, as a result of the additional singlet contribution. We also make predictions for various other variables that can be potentially tested in the future neutrino experiments such as the Dirac CP phase, which is predicted to be in the range of delta similar to (195 degrees - 200 degrees), and the neutrinoless double beta decay matrix element, < m(beta beta)>. One numerical example with the minimal chi(2) fit is presented, and the model predictions are consistent with all experimental results.
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页数:19
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