Impact of slepton generation mixing on the search for sneutrinos

TL;DR

This paper investigates how slepton generation mixing affects sneutrino production and decay in the MSSM, revealing significant impacts on collider search strategies and parameter determination despite strict experimental limits.

Contribution

It provides a systematic analysis of slepton mixing effects on sneutrino phenomenology, highlighting their importance for future collider experiments.

Findings

Slepton mixing can significantly alter sneutrino decay branching ratios.

Production cross sections are notably affected by slepton generation mixing.

Implications for collider searches and MSSM parameter extraction are substantial.

Abstract

We perform a systematic study of sneutrino production and decays in the Minimal Supersymmetric Standard Model (MSSM) with slepton generation mixing. We study both fermionic decays like sneutrino \to l^- chargino^+, nu neutralino and bosonic decays such as sneutrino \to slepton^- H^+, slepton^- W^+. We show that the effect of slepton generation mixing on the sneutrino production cross sections and its decay branching ratios can be quite large in a significant part of the MSSM parameter space despite the very strong experimental limits on lepton flavour violating processes. This could have an important impact on the search for sneutrinos and the determination of the MSSM parameters at future colliders, such as LHC, ILC, CLIC and muon collider.