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Journal of Experimental and Theoretical Physics 145, 991-1009 (2014)

ISSN: 1063-7761, SCI

Neutrino mass and mixing in the 3-3-1 model and S3 flavor symmetry with minimal Higgs content

V.V. Vien and H.N. Long

A new S 3 flavor model based on SU(3) C ⊗ SU(3) L ⊗ U(1) X gauge symmetry responsible for fermion masses and mixings different from our previous work [14 , 17] is constructed. The new feature is a two - dimensional representation of a Higgs ant i-sextet under S 3 which responsible for neutrino masses and mixings. The neutrinos acquire small masses from only an anti-sextet of SU(3) which is in a doublet under S 3 . If the difference of components of the anti-sextet is regarded as a small perturbation, S 3 is equivalently broken into identity, the corresponding neutrino mass mixing matrix acquires the most gener al form and the model can fit the latest data on neutrino oscillation. This way of the symmet ry breaking helps us to reduce a content in the Higgs sector, only one an anti-sextet instead of two as in our previous work [14]. Our results show that the neutrino masses are n aturally small and a small deviation from the tri-bimaximal neutrino mixing form can be rea lized. The Higgs potential of the model as well as the minimization conditions and gaug e boson masses and mixings is also considered.

DOI: 10.7868/S0044451014060044