Experimental Search for Chargino and Neutralino Production in Supersymmetry Models with a Light Gravitino

We search for inclusive high $E_T$ diphoton events with large missing transverse energy in $p\overline{p}$ collisions at $\sqrt{s}=1.8\mathrm{TeV}$. Such events are expected from pair production of charginos and neutralinos within the framework of the minimal supersymmetric standard model with a light gravitino. No excess of events is observed. In that model, and assuming gaugino mass unification at the GUT scale, we obtain a 95% C.L. exclusion region in the supersymmetry parameter space and lower mass bounds of $150\mathrm{GeV}{/c}^2$ for the lightest chargino and $77\mathrm{GeV}{/c}^2$ for the lightest neutralino.