Charged lepton-flavor violating processes and suppression of nonunitary mixing effects in low-scale seesaw models

Abstract

We examine the parameter space region of the inverse seesaw model that is consistent with neutrino oscillation data. We focus on the correlation between the current limits from the search of the $\mu \to e\gamma$ lepton flavor violating decay and the non-standard effects associated with the presence of new heavy neutrino states. Unlike what we would expect from an inverse seesaw model, we present a structure for the neutrinos mass matrices in which the rates of charged lepton flavor-violating processes are negligible. Additionally, we provide a model based on symmetries for such a scenario.

Comments: 18 pages, 3 figures and 3 tables; typos corrected, clarification and discussion added, version accepted for publication in PRD