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We use the three lepton and missing energy "trilepton" signature to searchfor chargino-neutralino production with $2.0 fb^{-1}$ of integrated luminositycollected by the CDF II experiment at the Tevatron $p\bar{p}$ collider. Weexpect approximately 11 supersymmetric events for a specific choice ofparameters of the mSUGRA model, but our observation of 7 events is consistentwith the standard model expectation of 6.4 events. We constrain the mSUGRAmodel of supersymmetry and rule out chargino masses up to $145 GeV/c^2$ for aspecific choice of parameters.

Search for Supersymmetry Using the Trilepton Signature of Chargino-Neutralino Production