A realistic model of neutrino masses with a large neutrinoless double beta decay rate

The minimal Standard Model extension with the Weinberg operator does accommodate the observed neutrino masses and mixing, but predicts a neutrinoless double beta (

0\nu\beta\beta

) decay rate proportional to the effective electron neutrino mass, which can be then arbitrarily small within present experimental limits. However, in general

0\nu\beta\beta

decay can have an independent origin and be near its present experimental bound; whereas neutrino masses are generated radiatively, contributing negligibly to

0\nu\beta\beta

decay. We provide a realization of this scenario in a simple, well defined and testable model, with potential LHC effects and calculable neutrino masses, whose two-loop expression we derive exactly. We also discuss the connection of this model to others that have appeared in the literature, and remark on the significant differences that result from various choices of quantum number assignments and symmetry assumptions. In this type of models lepton flavor violating rates are also preferred to be relatively large, at the reach of foreseen experiments. Interestingly enough, in our model this stands for a large third mixing angle,

\sin^2\theta_{13} \gtrsim 0.008

, when

\mu \rightarrow eee

is required to lie below its present experimental limit.

Note:

Published extended version with further references

neutrino: mass
neutrino: mixing angle
lepton: flavor: violation
standard model: minimal
operator: Weinberg
double-beta decay: (0neutrino)
decay rate
CERN LHC Coll

References(62)

Figures(10)

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