Search for chargino-neutralino production in ppbar collisions at sqrt(s) = 1.96 TeV

TL;DR

This paper reports a search for chargino-neutralino production in proton-antiproton collisions at 1.96 TeV, finding results consistent with the standard model and setting limits on supersymmetric particle masses.

Contribution

First search for chargino-neutralino production at Tevatron with new limits on chargino mass in specific models.

Findings

No excess events observed beyond standard model predictions.

Upper limits set on production cross sections.

Chargino mass lower limit established at 129 GeV/c^2.

Abstract

We present the results of a search for associated production of the chargino and neutralino supersymmetric particles using up to 1.1 fb-1 of integrated luminosity collected by the CDF II experiment at the Tevatron ppbar collider at a center-of-mass energy of 1.96 TeV. The search is conducted by analyzing events with a large transverse momentum imbalance and either three charged leptons or two charged leptons of the same electric charge. The numbers of observed events are found to be consistent with standard model expectations. Upper limits on the production cross section are derived in different theoretical models. In one of these models a lower limit on the mass of the chargino is set at 129 GeV/c^2 at the 95% confidence level.