Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1995-11-09
Phys.Lett. B372 (1996) 219-225
Physics
High Energy Physics
High Energy Physics - Phenomenology
12 pages, Plain Latex file, macros included in the beginning of the file, 3 figs on request from the authors. some minor typos
Scientific paper
10.1016/0370-2693(96)00083-4
We discuss the low energy implications of gauge coupling unification at the string scale, taking into account string threshold corrections in the $SU(4) {\times} O(4)$ model. We express $sin^2\theta_W$ and $a_3$ as functions of the calculable string threshold differences and discuss simple examples of spectra which retain the successful predictions of the supersymmetric unification. Using further the low energy data and reasonable values of the common gauge coupling at the string scale, we obtain the range of the threshold corrections. Finally, we study the top Yukawa coupling ($h_t$) evolution whose initial value is determined in terms of the common gauge coupling at the string scale. We find that $h_t$ reaches its (quasi) infra-red fixed point at the weak scale and discuss the implications on the top mass.
Leontaris George K.
Tracas N. D.
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