Inverse seesaw model with a natural hierarchy at the TeV scale

We propose a new kind of inverse seesaw model without any additional symmetries. Instead of the symmetries, we introduce several fermions and bosons with higher $SU(2{)}_L$ representations. After formulating the Higgs sector and neutrino sector, we show that the cutoff energy, which is valid for our model, is at around the TeV scale by examining behavior of $SU(2{)}_L$ gauge coupling. Then we show the validity of our model for testing at collider physics.

Figure 1

Feynman diagram to generate the masses of ${\mu }_{L/R}$.

Figure 2

The running of $g_2$ in terms of a reference energy of $\mu$.

Figure 3

The cross sections for processes $pp\to Z/\gamma \to {\mathrm{\Sigma }}^{+++}{\mathrm{\Sigma }}^{---}$ and $pp\to W^{\pm }\to {\mathrm{\Sigma }}^{+++(++)}{\mathrm{\Sigma }}^{--(---)}$ as a function of septet fermion mass.