D. Matalliotakis et Hp. Nilles, IMPLICATIONS OF NONUNIVERSALITY OF SOFT TERMS IN SUPERSYMMETRIC GRANDUNIFIED THEORIES, Nuclear physics. B, 435(1-2), 1995, pp. 115-128
Most discussions of supersymmetric grand unified theories assume unive
rsality of the soft supersymmetry breaking terms at the grand scale. W
e point out that the behaviour of these theories might change signific
antly in the presence of non-universal soft terms. Particularly in SO(
10)-like models with a large value of tan beta (and assuming Yukawa co
upling unification for the third generation) we observe a decisive cha
nge of predictions, allowing the presence of relatively light gauginos
as well as small supersymmetric corrections to the b-quark mass. Some
results remain rather stable, including the mu-M(1/2) correlation. Mo
dels with small tan beta seem to be less affected by non-universality
which mainly leads to the new possibility of small m(0) (i.e. the squa
rk and slepton soft mass parameter), excluded in the universal case.