Search for Chargino and Neutralino production at √s = 192-209 GeV at LEP

Approximately 438 pb(-1) of e (+) e(-) data from the OPAL detector, taken with the LEP collider running at centre-of-mass energies of 192-209 GeV, are analyzed to search for evidence of chargino pair production, e(+)e(-)-->(chi) over tilde (+)(1)(chi) over tilde (-)(1), or neutralino associated production, e(+)e(-)-->(chi) over tilde (0)(2)(chi) over tilde (0)(1). Limits are set at the 95% confidence level on the product of the cross-section for the process e+e--->(chi) over tilde (+)(1)(chi) over tilde (-)(1) and its branching ratios to topologies containing jets and missing energy, or jets with a lepton and missing energy, and on the product of the cross-section for e+e--->(chi) over tilde (0)(2)(chi) over tilde (0)(1) and its branching ratio to jets. R-parity conservation is assumed throughout this paper. When these results are interpreted in the context of the Constrained Minimal Supersymmetric Standard Model, limits are also set on the masses of the (chi) over tilde (+/-)(1)(chi) over tilde (0)(1) and (chi) over tilde (0)(2), and regions of the parameter space of the model are ruled out. Nearly model-independent limits are also set at the 95% confidence level on sigma(e(+)e(-)-->(chi) over tilde (+)(1)(chi) over tilde (-)(1)) with the assumption that each chargino decays via a W boson, and on sigma(e(+)e(-)-->(chi) over tilde (0)(2)(chi) over tilde (0)(1)) with the ($chi) over tilde (0)(2) assumed to decay via a Z(0).