Search for supersymmetric particles in scenarios with a gravitino LSP and stau NLSP

TL;DR

This paper reports a search for supersymmetric particles with a gravitino as the lightest particle and stau as the next-to-lightest, using DELPHI data at 189 GeV, setting new limits due to no observed signals.

Contribution

It extends previous searches by analyzing higher energy data with combined methods, establishing new constraints on supersymmetric particle production.

Findings

No evidence for supersymmetric particles was found.

Limits were set at 95% confidence level.

Analysis used combined methods from earlier lower-energy searches.

Abstract

Sleptons, neutralinos and charginos were searched for in the context of scenarios where the lightest supersymmetric particle is the gravitino. It was assumed that the stau is the next-to-lightest supersymmetric particle. Data collected with the DELPHI detector at a centre-of-mass energy near 189 GeV were analysed combining the methods developed in previous searches at lower energies. No evidence for the production of these supersymmetric particles was found. Hence, limits were derived at 95% confidence level.