Influence of Light and Heavy Thresholds on SUSY Unification
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In this paper we study and compare susy unification using two different approaches in order to take into account the effect of light particle thresholds on the evolution of gauge couplings: the step--function approximation, on the one hand, and a mass dependent procedure, which gives a more accurate description of the dependence of the results on the masses, on the other. We also include the effect of heavy thresholds, when $SU(5)$ is chosen as the unifying group. We find that the mass--dependent procedure excludes scenarios where all susy masses are below $1\;TeV$, and favors a value of $α_3(m_Z)$ near its upper experimental bound, contrary to the results obtained with the step--function approximation. We underline the dependence of the results on the procedure chosen to deal with light thresholds.
18 pages,LAEFF-93/014,REVTEX-2.1, 5 figures not included, available upon request (include FAX number)#
18 pages,LAEFF-93/014,REVTEX-2.1, 5 figures not included, available upon request (include FAX number)#