String no-scale supergravity model and its experimental consequences

We propose an SU(5)×U(1) string-derived model that satisfies the constraints from no-scale supergravity. All supersymmetric observables are calculated in terms of a single parameter, with consistency determining the rest, including tanβ=2.2–2.3 and ${\mathit{m}}_{\mathit{t}}$≊175 GeV. A small nonuniversality of the scalar masses at the string scale makes the right-handed sleptons the lightest supersymmetric particles for ${\mathit{m}}_{1/2}$≳180 GeV. This cutoff in the parameter space entails the guaranteed discovery of charginos at the Fermilab Tevatron and CERN LEP II, and right-handed sleptons and Higgs bosons at LEP II.