PERSPECTIVES FOR DETECTION OF A HIGGSINO-LIKE RELIC NEUTRALINO

It has been conjectured by Ambrosanio, Kane, Kribs, Martin and Mrenna (AKM) that the CDF event <p(p)overbar-->e(+)e(-)gamma gamma E-T is due to a decay chain involving two neutralino states (the lightest and th e next-to-lightest ones). The lightest neutralino (chi AKM) has been f urther considered by Kane and Wells as a candidate for cold dark matte r. In this paper we examine the properties of relic chi(AKM)'S in thei r full parameter space, and examine the perspectives for detection by comparing theoretical predictions to sensitivities of various experime ntal searches, We find that for most regions of the parameter space th e detectability of a relic chi(AKM) would require quite substantial im provements in current experimental sensitivities, The measurements of neutrino fluxes from the center of the Earth and of an excess of (p) o ver bar/p in cosmic rays are shown to offer some favorable perspective s for investigating a region of the chi(AKM) parameter space around th e maximal tan beta value allowed by the model. (C) 1997 Elsevier Scien ce B.V.