Charged lepton-flavor violating constraints to non-unitarity in the Linear Seesaw scheme

TL;DR

This paper investigates how current and future charged lepton flavor violation constraints limit non-unitary effects in the linear seesaw model, considering different neutrino mass orderings and parametrizations.

Contribution

It provides a comprehensive analysis of non-unitary parameter constraints in the linear seesaw scheme using experimental cLFV bounds and explores parametrization equivalences.

Findings

Stronger restrictions from rare muon decay searches.

Constraints differ between normal and inverted neutrino mass orderings.

Results are presented for multiple parametrizations of the non-unitary matrix.

Abstract

We analyze the non-unitary effects in the linear seesaw mechanism using the current constraints and future sensitivity of the charged Lepton Flavor Violation (cLFV) processes. We perform a random scan confronting the non-unitary parameters with the limits to the cLFV processes. We show our results for the normal and inverted ordering of the oscillation data. We also discuss the equivalence of different parametrizations of the non-unitary mixing matrix and show our results in terms of the different parameterizations. We found that the stronger restrictions in the non-unitary parameter space come from rare muon decay searches.