Search for Supersymmetry in ppbar Collisions at sqrt(s)=1.96 TeV Using the Trilepton Signature for Chargino-Neutralino Production

TL;DR

This paper searches for supersymmetry via the trilepton signature in proton-antiproton collisions at 1.96 TeV, using data from the CDF II detector, and sets limits on chargino masses based on the observed events.

Contribution

First search for supersymmetry using the trilepton signature at the Tevatron with 2.0 fb^-1 of data, constraining the mSUGRA model and chargino masses.

Findings

Observed events are consistent with the standard model.

Excluded chargino masses up to 145 GeV/c^2 for certain parameters.

No significant excess indicating supersymmetry detection.

Abstract

We use the three lepton and missing energy "trilepton" signature to search for chargino-neutralino production with 2.0 inverse femtobarns of integrated luminosity collected by the CDF II experiment at the Tevatron ppbar collider. We expect an excess of approximately 11 supersymmetric events for a choice of parameters of the mSUGRA model, but our observation of 7 events is consistent with the standard model expectation of 6.4 events. We constrain the mSUGRA model of supersymmetry and rule out chargino masses up to 145 GeV/c^2 for a specific choice of parameters.