Absolute Lower Limits on the Masses of Selectrons and Sneutrinos in the MSSM

TL;DR

This paper establishes lower mass limits for selectrons and sneutrinos within the MSSM using LEP data, providing key constraints for supersymmetric particle searches.

Contribution

It provides the first absolute lower mass bounds on selectrons and sneutrinos under specific MSSM assumptions using LEP data.

Findings

Lower selectron mass limit of 73 GeV/c2 at 95% CL

Limit of 107 GeV/c2 for heavier selectron

Sneutrino mass limit of 84 GeV/c2

Abstract

The results of searches for selectrons, charginos and neutralinos performed with the data collected by the ALEPH detector at LEP at centre-of-mass energies up to 209 GeV are interpreted in the framework of the Minimal Supersymmetric extension of the Standard Model with R-parity conservation. Under the assumptions of gaugino and sfermion mass unification and no sfermion mixing, an absolute lower limit of 73 GeV/c2 is set on the mass of the lighter selectron at the 95% confidence level. Similarly, limits on the masses of the heavier selectron and of the sneutrino are set at 107 and 84 GeV/c2, respectively. Additional constraints are derived from the results of the searches for Higgs bosons. The results are also interpreted in the framework of minimal supergravity.