Searches for Lepton Flavour Violation at a Linear Collider

TL;DR

This paper explores the potential for detecting lepton flavour violation at a Linear Collider within supersymmetric models, highlighting the complementarity with LHC and low-energy experiments.

Contribution

It analyzes the prospects for observing LFV signals in slepton production and decay at a Linear Collider, considering neutrino data-guided models and their relation to cosmological relic density.

Findings

LC can detect LFV in both left and right slepton sectors.

Complementarity between LC, LHC, and low-energy LFV searches enhances discovery potential.

LFV signals depend on specific supersymmetric parameter space regions.

Abstract

We investigate the prospects for detection of lepton flavour violation in sparticle production and decays at a Linear Collider (LC), in models guided by neutrino oscillation data. We consider both slepton pair production and sleptons arising from the cascade decays of non-leptonic sparticles. We study the expected signals when lepton-flavour-violating (LFV) interactions are induced by renormalization effects in the Constrained Minimal Supersymmetric extension of the Standard Model (CMSSM), focusing on the subset of the supersymmetric parameter space that also leads to cosmologically interesting values of the relic neutralino LSP density. Emphasis is given to the complementarity between the LC, which is sensitive to mixing in both the left and right slepton sectors, and the LHC, which is sensitive primarily to mixing in the right sector. We also emphasize the complementarity between searches for rare LFV processes at the LC and in low-energy experiments.