Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-11-14
JHEP 1104:015,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
20 pages, 3 figures, and 3 tables; references and Appendix C added, version accepted for publication in JHEP
Scientific paper
10.1007/JHEP04(2011)015
We study the lepton sector of a four generations model based on the discrete flavor group $A_5$ (the even permutation of five objects). The best features of the three family $A_4$ model survive, including the tribimaximal pattern of three generation neutrino mixings. At leading order the three light neutrino mass relations of $m_{\nu_1} = m_{\nu_3}$ and $m_{\nu_2} = 0$ are predicted. The splitting of the neutrino masses can be naturally obtained as a result of the breaking of $A_{5}$ down to $A_4$ and a degenerate spectrum is preferred in our model. In our $A_5$ model, the electron mass is zero at tree level, but calculable through quantum corrections.
Chen Chian-Shu
Kephart Thomas W.
Yuan Tzu-Chiang
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