Low Energy Implications of Minimal Superstring Unification

Details Low Energy Implications of Minimal Superstring Unification Low Energy Implications of Minimal Superstring Unification

1995-11-09

arxiv.org/abs/hep-ph/9511284v1

Phys.Lett. B375 (1996) 154-162

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, LaTEX, psfig, 8 figures

Scientific paper

10.1016/0370-2693(96)00190-6

We study the phenomenological implications of effective supergravities based on string vacua with spontaneously broken N=1 supersymmetry by dilaton and moduli $F$-terms. We further require Minimal String Unification, namely that large string threshold corrections ensure the correct unification of the gauge couplings at the grand unification scale. The whole supersymmetric mass spectrum turns out to be determined in terms of only two independent parameters, the dilaton-moduli mixing angle and the gravitino mass. In particular we discuss the region of the parameter space where at least one superpartner is ``visible" at LEP2. We find that the most likely candidates are the scalar partner of the right-handed electron and the lightest chargino, with interesting correlations between their masses and with the mass of the lightest higgs. We show how discovering SUSY particles at LEP2 might rather sharply discriminate between scenarios with pure dilaton SUSY breaking and mixed dilaton-moduli breaking.

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