SEARCH FOR NEUTRALINOS IN E(-) COLLISIONS IN THE NEXT-TO-MINIMAL SUPERSYMMETRIC MODEL()E()

We study the pair productions of neutralinos in the next-to-minimal su persymmetric standard model in the future 500-GeV e(+)e(-) collider. F or a reasonable set of parameters that are consistent with the present experimental data, we analyze the productions for different values of the scalar electron mass. The analysis shows that all the neutralinos but the heaviest one may be produced if the scalar electrons do not h ave masses larger than 1 TeV. The lightest neutralino may be assumed t o be the lightest supersymmetric particle, making itself a candidate f or the dark matter in the universe. The conditions for the lightest ne utralino to account for the dark matter problem is also investigated.