MSSM SUGRA searches at LEP

TL;DR

This paper reports on LEP2 data analysis searching for supersymmetric particles within the MSSM framework, setting exclusion limits on their masses and production cross-sections, with no evidence of new particles found.

Contribution

First comprehensive search for MSSM supersymmetric particles at LEP2 energies, establishing new exclusion limits on their masses and cross-sections.

Findings

No evidence for supersymmetric particles was observed.

Excluded regions in MSSM parameter space at 95% confidence level.

Set new lower limits on the masses of the lightest neutralino and other sparticles.

Abstract

During the LEP2 operation, the 4 LEP experiments have collected data at centre-of-mass energies up to 209 GeV. Those data have been analysed in the search of charginos, neutralinos and sfermions in the framework of the Minimal Supersymmetric Standard Model (MSSM) with R-parity conservation and assuming the lightest neutralino to be the Lightest Supersymmetric Particle (SUGRA-model). No evidence for a signal was found in any of the channels. The results of each search were used to derive upper limits on production cross-sections and masses. In addition, the combined result of all searches excludes regions in the parameter space of the constrained MSSM, leading to limits on the mass of the LSP. All limits are given at 95% confidence level, all results are preliminary.