Electroweak-scale mirror fermions, $\mu \to e \gamma$ and $\tau \to \mu \gamma$

TL;DR

This paper estimates lepton flavor violating decays in a model with electroweak-scale right-handed neutrinos, linking experimental bounds to model parameters and high-energy collider signatures.

Contribution

It provides new constraints on model parameters from LFV decay bounds and explores implications for collider phenomenology.

Findings

Strong bounds on model parameters from experimental LFV limits

Connection between low-energy decays and high-energy collider signals

Predictions for decay lengths of mirror charged leptons

Abstract

The Lepton Flavour Violating (LFV) processes $\mu \to e \gamma$ and $\tau \to \mu \gamma$ are estimated in a model of electroweak-scale right-handed neutrinos. The present bounds on the branching ratios, $B(\mu \to e \gamma)< 1.2 \times 10^{-11}$, $B(\tau \to \mu \gamma) < 6.8 \times 10^{-8}$ (BaBar) and $< 4.5 \times 10^{-8}$ (Belle), puts strong constraints on the parameters of the model. This constraint links low energy rare decay processes to high-energy phenomena (e.g. decay lengths of the mirror charged leptons which are important in the search for the telltale like-sign dilepton events present in the model of electroweak-scale right-handed neutrinos).