Abstract
A search has been performed for the production of neutralinos ( χ, χ′) in e +e − annihilation at energies near the Z 0 pole. No evidence for these particles was found either in searches for events with two acoplanar jets, low visible energy, and missing p t (sensitive to Z 0→χχ′→χχ f f ) or in searches for single-photon events (sensitive to Z 0→ χχ′→ χχγ). Model independent upper limits (at the 95% CL) on the branching ratio for the decay mode Z 0 → χχ′ of a few 10 −4 are obtained for most of the range of neutralino masses that is kinematically accessible at LEP energies. Upper limits on the mixing factor of neutralinos are also placed as a function of the neutralino masses.
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