Can the sneutrino be the lightest supersymmetric particle ?

TL;DR

This paper investigates whether the sneutrino can be the lightest supersymmetric particle within the constrained MSSM, concluding that recent LEP I limits exclude this possibility based on the invisible Z width constraints.

Contribution

The study demonstrates that LEP I experimental limits rule out the sneutrino as the lightest supersymmetric particle in the constrained MSSM.

Findings

LEP I limits exclude sneutrino as LSP

Constraints from invisible Z width are decisive

Sneutrino cannot be the lightest sparticle

Abstract

Within the framework of the constrained Minimal Supersymmetric extension of the Standard Model we show that recent LEP I limits on the invisible Z width exclude the possibility that the lightest sparticle is the sneutrino.