Lepton Flavour Violation in minimal grand-unified type II seesaw models

TL;DR

This paper analyzes minimal SU(5) grand unification models with type II seesaw neutrino mass generation, focusing on gauge coupling unification, proton decay constraints, and lepton-flavor-violating processes to infer properties of new particles.

Contribution

It provides a Bayesian analysis of the mass scales of new particles in minimal SU(5) models with type II seesaw, considering unification and experimental bounds, and explores LFV processes for additional insights.

Findings

Robust bounds on the masses of beyond Standard Model particles.

Predictions for LFV observables that can constrain neutrino parameters.

Interplay of LFV searches can inform on new particle masses.

Abstract

We revisit minimal non-supersymmetric models of SU(5) Grand Unification with the type II seesaw mechanism as the origin of neutrino masses. Imposing the requirement of gauge coupling unification and the proton lifetime bounds, we perform a Bayesian fit and obtain robust quantitative information on the mass scales of the beyond the Standard Model particles. We then study lepton-flavour-violating (LFV) processes induced by the type II scalar triplet and its SU(5) partners, showing that the interplay of upcoming searches for different LFV observables can provide additional information on the masses of the new particles, as well as non-trivial constraints on neutrino parameters.