EXPERIMENTAL ASPECTS OF SU(5)XU(1) SUPERGRAVITY

We study various aspects of SU(5) X U(1) supergravity as they relate t o the experimental verification or falsification of this model. We con sider two string-inspired, universal, one-parameter, no-scale soft-sup ersymmetry-breaking scenarios, driven by the F terms of the moduli and dilaton fields. The model is described in terms of the supersymmetry mass scale (i.e., the chargino mass m(chi1+/-)), tanbeta, and the top- quark mass. We first determine the combined effect on the parameter sp ace of all presently available direct and indirect experimental constr aints, including the CERN LEP lower bounds on sparticle and Higgs-boso n masses, the b-->sgamma rate, the anomalous magnetic moment of the mu on, the high-precision electroweak parameters epsilon1,epsilon(b) (whi ch imply m(t) less than or similar 180 GeV), and the muon fluxes in un derground detectors (neutrino telescopes). For the still-allowed point s in (m(chi1)+/-, tanbeta) parameter space, we reevaluate the experime ntal situation at the Fermilab Tevatron, LEP II, and DESY HERA. In the 1994 run, the Tevatron could probe chargino masses as high as 100 GeV . At LEP II the parameter space could be explored with probes of diffe rent resolutions: Higgs-boson searches, selectron searches, and chargi no searches. Moreover, for m(t) less than or similar 150 GeV, these Hi ggs-boson searches could explore all of the allowed parameter space wi th square-root s less than or similar 210 GeV.