Probing leptonic CP phases in LFV processes

TL;DR

This paper investigates CP violation in muon to electron conversion processes, finding potential observable effects in left-right symmetric theories for certain energy scales, which could reveal new physics beyond the Standard Model.

Contribution

It introduces a novel CP and T violating correlation in lepton flavor violation processes within left-right symmetric models, highlighting conditions for potential observation.

Findings

Negative results for seesaw mechanisms

Order-one CP violation in left-right models below 10-30 TeV

Potential observability of CP violation in LFV processes

Abstract

We study a CP and T violating triple (spin) correlation in the muon to electron conversion in nuclei in the context of the seesaw mechanism. After concluding that the results are negative for all three seesaw types, we turn to the left-right symmetric theories as the original source of seesaw. We find that in general this correlation is of order one which offers a hope of observing CP violation in lepton flavor violating processes for a L-R scale below around 10-30 TeV. We discuss the conditions that could render to (unlikely) conspiracies as to suppress the CP violating effects.