Type I Seesaw Mechanism, Lepton Flavour Violation and Higgs Decays

TL;DR

This paper reviews constraints on minimal type I seesaw models at the electroweak scale, focusing on neutrino flavor structure, lepton flavor violation, and potential Higgs decay signatures.

Contribution

It updates phenomenological constraints on low-scale type I seesaw models, linking neutrino data, lepton flavor violation, and Higgs decay searches.

Findings

Strongest constraints from  decay limits

Potential Higgs decays into neutrinos as probes

Neutrino Yukawa structure consistent with oscillation data

Abstract

We review and update the current phenomenological constraints on minimal type I seesaw extensions of the Standard Model in which New Physics content can be probed at the electroweak scale. In this class of models, the flavour structure of the neutrino Yukawa couplings is determined by the requirement of reproducing neutrino oscillation data. The strongest constraints on the seesaw parameter space are imposed by the very recent upper limit on \mu\ --> e \gamma\ decay rate. Searches of non-standard Higgs boson decays into a light and a heavy neutrino may also provide and independent test of these seesaw scenarios.