Wa. Bardeen et al., INFRARED FIXED-POINT SOLUTION FOR THE TOP-QUARK MASS AND UNIFICATION OF COUPLINGS IN THE MSSM, Physics letters. Section B, 320(1-2), 1994, pp. 110-116
We analyze the implications of the infrared quasi fixed point solution
for the top quark mass in the Minimal Supersymmetric Standard Model.
This solution could explain in a natural way the relatively large valu
e of the top quark mass and, if confirmed experimentally, may be sugge
stive of the onset of nonperturbative physics at very high energy scal
es. In the framework of grand unification, the expected bottom quark-t
au lepton Yukawa coupling unification is very sensitive to the fixed p
oint structure of the top quark mass. For the presently allowed values
of the electroweak parameters and the bottom quark mass, the Yukawa c
oupling unification implies that the top quark mass must be within ten
percent of its fixed point values.