Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1993-10-04
Phys.Lett.B322:355-362,1994
Physics
High Energy Physics
High Energy Physics - Phenomenology
18 pages,LAEFF-93/014,REVTEX-2.1, 5 figures not included, available upon request (include FAX number)#
Scientific paper
10.1016/0370-2693(94)91165-7
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 $\alpha_3(m_Z)$ 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.
Bastero-Gil Mar
Perez--Mercader Juan
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