The lower mass limit on the lightest supersymmetric particle, using ALEPH data up to 188.6GeV

TL;DR

This paper reports a search for the lightest supersymmetric particle (LSP) using ALEPH data up to 188.6 GeV, setting a lower mass limit of 32.3 GeV/c² assuming R-parity conservation.

Contribution

First direct experimental limit on the LSP mass using ALEPH data near 189 GeV center-of-mass energy.

Findings

LSP mass > 32.3 GeV/c² at 95% confidence level

Used 175 pb⁻¹ of data from ALEPH detector

Assumed R-parity conservation in analysis

Abstract

The lightest srpersymmetric particle (LSP) is expected to be stable, massive and neutral. Direct searches for supersymmetric particles in the context of the minimal supersymmetric extension to the standard model have been performed with the ALEPH detector. Using about 175pb-1 of data with centre-of-mass energies near 189GeV a limit on the mass of the LSP of M_LSP>32.3GeV/c2 at 95% confidence can be derived, assuming R-parity is conserved.