Searches for Gauge-Mediated SUSY Breaking Topologies with the L3 Detector at LEP

TL;DR

This paper reports on searches for gauge-mediated supersymmetry breaking signals at LEP using the L3 detector, setting new limits on sparticle masses and model parameters across all NLSP lifetimes.

Contribution

It provides comprehensive experimental limits on GMSB SUSY models considering all NLSP lifetimes, updating previous bounds with new data and analysis.

Findings

No evidence for GMSB SUSY phenomena was observed.

Lower limits of 62.2 GeV on NLSP mass, 11 TeV on Lambda, and 0.07 eV on gravitino mass were established.

The study discusses the combined LEP search results and their implications.

Abstract

Searches for topologies predicted by gauge-mediated SUSY breaking models were performed using data collected with the L3 detector at LEP. All possible lifetimes of the next-to-lightest SUSY particle (NLSP), neutralino or scalar tau, were considered. No evidence for these new phenomena was found and limits on the production cross sections and sparticle masses were derived. A scan over the parameters of the minimal GMSB model was performed, leading to lower limits of 62.2 GeV, 11 TeV, and 0.07 eV on the NLSP mass, the mass scale parameter Lambda, and the gravitino mass, respectively. The status of the LEP combined searches is also discussed.