The mu - e Conversion in Nuclei, mu --> e gamma, mu --> 3e Decays and TeV Scale See-Saw Scenarios of Neutrino Mass Generation

TL;DR

This paper analyzes lepton flavor violation in minimal see-saw extensions of the Standard Model, exploring how neutrino parameters influence LFV processes like mu to e gamma, mu to 3e, and mu-e conversion, with implications for TeV-scale neutrino mass models.

Contribution

It provides a detailed analysis of LFV predictions in minimal see-saw models, highlighting how neutrino oscillation parameters constrain and distinguish different scenarios.

Findings

LFV observables depend on neutrino mass hierarchy and phases.

Certain parameter regions predict detectable LFV signals.

Interplay of neutrino parameters can discriminate between see-saw models.

Abstract

We perform a detailed analysis of lepton flavour violation (LFV) within minimal see-saw type extensions of the Standard Model (SM), which give a viable mechanism of neutrino mass generation and provide new particle content at the electroweak scale. We focus, mainly, on predictions and constraints set on each scenario from mu --> e gamma, mu --> 3e and mu - e conversion in the nuclei. In this class of models, the flavour structure of the Yukawa couplings between the additional scalar and fermion representations and the SM leptons is highly constrained by neutrino oscillation measurements. In particular, we show that in some regions of the parameters space of type I and type II see-saw models, the Dirac and Majorana phases of the neutrino mixing matrix, the ordering and hierarchy of the active neutrino mass spectrum as well as the value of the reactor mixing angle theta_{13} may considerably affect the size of the LFV observables. The interplay of the latter clearly allows to discriminate among the different low energy see-saw possibilities.