Waiting for mu->eg from the MEG experiment

TL;DR

This paper discusses the potential implications of observing or constraining mu->eg lepton flavor violation at the MEG experiment, focusing on supersymmetric models with a see-saw mechanism and their connection to neutrino physics and grand unified theories.

Contribution

It analyzes the phenomenological impact of mu->eg observations on SUSY see-saw models and explores related observables to understand neutrino parameters and GUT scenarios.

Findings

Observation of mu->eg would indicate new physics beyond the Standard Model.

Related LFV observables can help reconstruct neutrino sector parameters.

Improved bounds constrain SUSY and GUT model parameters.

Abstract

The Standard Model (SM) predictions for the lepton flavor-violating (LFV) processes like mu->eg are well far from any realistic experimental resolution, thus, the appearance of m->eg at the running MEG experiment would unambiguously point towards a New Physics (NP) signal. In this article, we discuss the phenomenological implications in case of observation/improved upper bound on m->eg at the running MEG experiment for supersymmetric (SUSY) scenarios with a see-saw mechanism accounting for the neutrino masses. We outline the role of related observables to m->eg in shedding light on the nature of the SUSY LFV sources providing useful tools i) to reconstruct some fundamental parameters of the neutrino physics and ii) to test whether an underlying SUSY Grand Unified Theory (GUT) is at work. The perspectives for the detection of LFV signals in tau decays are also discussed.