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tralino production via t-channel exchange, which is of OCR Output a forward-backward tracking chamber, a high resolu assumed to be heavier than 45 so that the decays X' -+ Xh, XAand X' -» Xfff°°r esults are interpreted in the MSSM context as well as h° or A0, and charginos, gi are sufficiently large [5] hadronic Z decays collected in 1991 ---1993. TheseWe assume that the masses of the lightest higgs, search for neutralinos, which are based on 1.8 X 10 involving ·r leptons.We present the event selection and results of our small branching fraction, we did not investigate decays mass to charged leptons and quarks of charge -%e. with mx less than 18 GeV, if either tanB > 2 or the gluino mass mz-> 100 GeV.In the framework ofthe Minimal Supersymmetric Standard Model, we exclude a lightest X used to set upper limits of a few times 10'° on the branching ratios Z -• XX' and Z -» X'X'.hadronic Z decays collected with the L3 detector at LEP. Absence of any signal has been neutralino, X, and either a photon or a fcrmion pair. This analysis is based on 1.8 x 106XX' and e+e" -> X' X' , where the next-to lightest neutralino, X', decays into the lightest A search for neutralinos produced in Z decays has been performed via the reactions e+e" --> ABSTRACT L3 Collaboration

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