Gaugino searches and constraints on supersymmetry

TL;DR

This paper reviews the constraints on supersymmetric models from LEP gaugino searches, highlighting how the absence of signals imposes lower bounds on neutralino and other superpartner masses within minimal GUT-unified frameworks.

Contribution

It provides updated lower mass limits on supersymmetric particles based on LEP data, emphasizing the impact of null results on model parameter space.

Findings

Lower bounds on the lightest neutralino mass

Constraints on other supersymmetric particle masses

No evidence of supersymmetry signals at LEP

Abstract

The negative outcome of gaugino searches at LEP has been one of the most disappointing results for fans of supersymmetric models. In the framework of minimal supersymmetric models with GUT unification assumptions, the combined absence of supersymmetry and Higgs signals in the LEP data, sets stringent constraints on the models parameter space, and lower limits on the mass of the lightest neutralino and of other supersymmetric particles. All limits are given at 95% Confidence Level.