Potential of a Linear Collider for Lepton Flavour Violation studies in the SUSY seesaw

TL;DR

This paper evaluates the potential of a linear collider to detect charged lepton flavor violation within a supersymmetric seesaw model, focusing on e-mu and mu-mu final states, and analyzes how beam polarization enhances detection prospects.

Contribution

It provides a detailed analysis of lepton flavor violation signals at a linear collider in a SUSY seesaw framework, including background estimation and the impact of beam polarization.

Findings

e-mu flavor transitions can be detected with optimized beam polarization

mu-mu final state offers a clear signature with minimal standard model background

energy dependence analysis improves signal-to-background discrimination

Abstract

We study the potential of an e+- e- Linear Collider for charged lepton flavour violation studies in a supersymmetric framework where neutrino masses and mixings are explained by a type-I seesaw. Focusing on e-mu flavour transitions, we evaluate the background from standard model and supersymmetric charged currents to the e mu + missing E_T signal. We study the energy dependence of both signal and background, and the effect of beam polarisation in increasing the signal over background significance. Finally, we consider the mu- mu- + missing E_T final state in e- e- collisions that, despite being signal suppressed by requiring two e-mu flavour transitions, is found to be a clear signature of charged lepton flavour violation due to a very reduced standard model background.