Supersymmetric Lepton Flavour Violation in Low-Scale Seesaw Models

TL;DR

This paper investigates a supersymmetric mechanism for lepton flavour violation in low-scale seesaw models, highlighting processes that can be significantly enhanced and detectable in experiments.

Contribution

It introduces a new supersymmetric mechanism for lepton flavour violation in minimal MSSM extensions with low-mass heavy neutrinos, identifying processes that are enhanced and observable.

Findings

mu -> e gamma, tau -> e gamma, tau -> mu gamma are forbidden in the supersymmetric limit

mu -> eee, mu -> e conversion, tau -> eee, tau -> e mu mu can be enhanced significantly

Potentially large neutrino Yukawa couplings can lead to observable lepton flavour violation signals

Abstract

We study a new supersymmetric mechanism for lepton flavour violation in muon and tau decays and muon -> e conversion in nuclei, within a minimal extension of the MSSM with low-mass heavy singlet neutrinos and sneutrinos. We find that the decays mu -> e gamma, tau -> e gamma and tau -> mu gamma are forbidden in the supersymmetric limit of the theory, whereas other processes, such as mu -> eee, mu -> e conversion, tau -> eee and tau -> e mu mu, are allowed and can be dramatically enhanced several orders of magnitude above the observable level by potentially large neutrino Yukawa coupling effects. The profound implications of supersymmetric lepton flavour violation for present and future experiments are discussed.