Lepton flavor violation in type I + III seesaw

TL;DR

This paper explores how low-scale type I + III seesaw models induce lepton flavor violation through fermionic triplet and singlet mixing, analyzing experimental bounds and future detection prospects.

Contribution

It provides a detailed analysis of flavor violating effects in type I + III seesaw models, focusing on minimal cases and experimental constraints.

Findings

Bounds on Yukawa couplings are established.

Different channels for lepton flavor violation are analyzed.

Future experiments could probe these couplings effectively.

Abstract

In the presence of a low scale seesaw of type I + III, flavor violating effects in the leptonic sector are expected. Their presence in the charged sector is due to the mixing of the fermionic vector-like weak triplets with the chiral doublets, which cause non-universality of the tree-level Z coupling. We investigate the bounds on the Yukawa couplings which are responsible for the mixing and present the results for two minimal cases, a fermionic triplet with a singlet or two fermionic triplets. Different channels for these processes are considered and their current and future potential to probe these couplings is discussed.