M. Carena et Cem. Wagner, HIGGS AND SUPERSYMMETRIC PARTICLE SIGNALS AT THE INFRARED FIXED-POINTOF THE TOP-QUARK MASS, Nuclear physics. B, 452(1-2), 1995, pp. 45-79
We study the properties of the Higgs and supersymmetric particle spect
rum, associated with the infrared fixed point solution of the top quar
k mass in the Minimal Supersymmetric Standard Model. We concentrate on
the possible detection of these particles, analysing the deviations f
rom the Standard Model predictions for the leptonic and hadronic varia
bles measured at LEP and for the b --> s gamma decay rate. We consider
the low and moderate tan beta regime, imposing the constraints derive
d from a proper radiative SU(2)(L) X U(1)(Y) symmetry breaking, and we
study both the cases of universal and non-universal soft supersymmetr
y-breaking parameters at high energies. In the first case, for any giv
en value of the top quark mass, the Higgs and supersymmetric particle
spectrum is completely determined as a function of only two soft super
symmetry-breaking parameters, implying very definite experimental sign
atures. In the case of non-universal mass parameters at M(GUT), instea
d, the strong correlations between the sparticle masses are relaxed, a
llowing a richer structure for the precision data variables. As a gene
ral feature, whenever a significant deviation from the Standard Model
value of the precision data parameters is predicted, a light sparticle
, which should be visible at LEP2, appears in the model.