Chian-Shu Chen, Chao-Qiang Geng, Lu-Hsing Tsai
Motivated by the large rate of $H\to \gamma\gamma$ at the LHC, we explore a class of models with high dimensional representations of scalars to realize small Majorana neutrino masses at two-loop level without imposing any new symmetry. In these models, multi scalars with the electric charges higher than two are naturally expected, which not only enhance the $H\to \gamma\gamma$ rate, but provide more searching grounds at the LHC.
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http://arxiv.org/abs/1212.6208
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