Search for Supersymmetry via Associated Production of Charginos and Neutralinos in Final States with Three Leptons

TL;DR

This paper reports a search for supersymmetry through associated chargino and neutralino production in three-lepton final states, setting new mass limits based on Fermilab collider data.

Contribution

First search for supersymmetry in this channel at the Tevatron, establishing limits on chargino masses within the minimal supergravity framework.

Findings

No evidence for supersymmetry was observed.

A chargino mass lower limit of 117 GeV was set at 95% confidence level.

Constraints on production cross sections and branching fractions were derived.

Abstract

A search for associated production of charginos and neutralinos is performed using data recorded with the D0 detector at a ppbar center-of-mass energy of 1.96 TeV at the Fermilab Tevatron Collider. This analysis considers final states with missing transverse energy and three leptons, of which at least two are electrons or muons. No evidence for supersymmetry is found in a dataset corresponding to an integrated luminosity of 320 pb-1. Limits on the product of the production cross section and leptonic branching fraction are set. For the minimal supergravity model, a chargino lower mass limit of 117 GeV at the 95% C.L. is derived in regions of parameter space with enhanced leptonic branching fractions.