CONSTRAINTS ON FINITE SOFT SUPERSYMMETRY-BREAKING TERMS

Requiring the soft supersymmetry-breaking (SSB) parameters in finite g auge-Yukawa unified models to be finite up to and including two-loop o rder, we derive a two-loop sum rule for the soft scalar masses, It is shown that this sum rule coincides with that of a certain class of str ing models in which the massive string states are organized into N = 4 supermultiplets. We investigate the SSB sector of two finite SU(5) mo dels. Using the sum rule which allows non-universality of the SSB term s and requiring that the lightest superparticle is neutral, we constra in the parameter space of the SSB sector in each model. (C) 1998 Elsev ier Science B.V.