Neutrinoless double beta decays tell nature of right-handed neutrinos

Abstract

We consider the minimal seesaw model, the Standard Model extended by two right-handed neutrinos, for explaining the neutrino masses and mixing angles measured in oscillation experiments. When one of right-handed neutrinos is lighter than the electroweak scale, it can give a sizable contribution to neutrinoless double beta ($0\nu \beta \beta$) decay. We show that the detection of the $0\nu \beta \beta$ decay by future experiments gives a significant implication to the search for such light right-handed neutrino.

Comments: 5 pages, 5 figures