A model of electroweak-scale right-handed neutrino mass

Abstract

If neutrino masses are realized through the see-saw mechanism, can the right-handed neutrinos be produced and detected at present and future colliders? The answer is negative in the most popular see-saw scenarios for the simple reason that they are too heavy in these models. However, a simple extension of the Standard Model (SM) particle content, including mirror fermions, two $SU(2{)}_L$ triplet and one singlet Higgs fields, leads to a scenario in which the see-saw mechanism is realized with the Majorana mass $M_R$ of the right-handed neutrino being of the order of the electroweak scale or smaller. A custodial SU(2) symmetry arising from the two triplet Higgs fields ensures that $\rho =1$ at tree level even when their vacuum expectation values (VEV) which determine the value of $M_R$, can be as large as the electroweak scale. $M_R$ is found to obey the bound $\frac{M_Z}{2}\le M_R<246GeV$ which makes it accessible experimentally (Tevatron, LHC or ILC) since, in our scenario, ${\nu }_R$'s can couple directly to the Standard Model (SM) gauge bosons.

5 double-column pages. Version to appear in Phys. Lett. B

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