Lepton Flavour Violating Effects on Chargino Production at the ILC

TL;DR

This paper examines how lepton flavor violation affects chargino pair production at the ILC within the MSSM, showing that LFV can significantly alter cross sections and impact parameter determination.

Contribution

It demonstrates the impact of LFV on chargino production processes and highlights the importance of including LFV parameters in model analyses at the ILC.

Findings

LFV can double the cross section for certain chargino production processes.

Sneutrino mass eigenstates lose definite flavor in the presence of LFV.

LFV effects are consistent with current limits from rare lepton decay measurements.

Abstract

We review the influence of lepton flavour violation (LFV) on the production processes e+e- -> ~chi+_i ~chi-_j at the International Linear Collider (ILC) with longitudinal e+ and e- beam polarizations in the framework of the Minimal Supersymmetric Standard Model (MSSM). The t-channel sneutrino exchange contribution to the processes e+e- -> ~chi+_i ~chi-_j is modified in the case of LFV, as the sneutrino mass eigenstates have no definite flavour, and therefore more than one sneutrino can contribute. This influence can alter the cross section sigma(e+e- -> ~chi+_1 ~chi-_1) by a factor of 2 or more when varying the LFV mixing angles, in accordance with the restrictions due to the current limits on rare lepton decays. Hence, the inclusion of LFV parameters can be important when deducing the underlying model parameters from measured observables such as sigma(e+e- -> ~chi+_1 ~chi-_1).