Search for direct production of charginos and neutralinos in events with three leptons and missing transverse momentum in sqrt(s) = 7 TeV pp collisions with the ATLAS detector

TL;DR

This paper reports a search for charginos and neutralinos in three-lepton final states with missing transverse momentum using 7 TeV proton-proton collision data from the ATLAS detector, setting new limits on supersymmetric models.

Contribution

It presents the first search for charginos and neutralinos in three-lepton final states at 7 TeV with ATLAS, extending previous experimental limits.

Findings

No significant excess over Standard Model expectations was observed.

Upper limits were set on supersymmetric particle production cross sections.

Results significantly improve constraints on R-parity conserving supersymmetric models.

Abstract

A search for the direct production of charginos and neutralinos in final states with three electrons or muons and missing transverse momentum is presented. The analysis is based on 4.7 fb-1 of sqrt(s) = 7 TeV proton-proton collision data delivered by the Large Hadron Collider and recorded with the ATLAS detector. Observations are consistent with Standard Model expectations in three signal regions that are either depleted or enriched in Z-boson decays. Upper limits at 95% confidence level are set in R-parity conserving phenomenological minimal supersymmetric models and in simplified models, significantly extending previous results.