A see-saw model of sterile neutrino |
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Institution: | 1. School of Information Science and Engineering, Yanshan University, Hebei Qinhuangdao, 066004, China;2. The Chinese People’s Liberation Army 73676, Jiangsu Jiangyin, 214400, China |
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Abstract: | If the smallness of the mass of the sterile neutrino is to be explained by the see-saw mechanism, the off-diagonal entries of the mass matrix needs to be protected by some symmetry not far above the electroweak scale. We implement see-saw mechanism in a gauge model based on SU(2)qL×SU(2)lL×U(1)qY×U(1)lY un-unified gauge group which breaks to SU(2)L×U(1)Y at the TeV region via a two-step symmetry breaking chain. The right handed diagonal block is tied to the highest scale up to which the un-unification symmetry holds. The sterile neutrino emerges from a quark-lepton mixed representation of the un-unified group. |
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