2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/41399On the evaluation of $\tanβ$ is revisited by the method of the renormalization group with the criteria of the bottom-tau unification in the SUSY SU(5) GUT model. Among the conventional supersymmetric theories, an energy-scale constant $M_{SUSY}$ is introduced by-hand to decouple the lower energy-scale region from the effects of the supersymmetric particles. Provided that $M_{SUSY}$ really exists, only small $\tanβ \simeq 2$ is allowed theoretically. While, medium value as $\tanβ = 6 \sim 25$ is also supported if $M_{SUSY}$ is vanished away from the model.21 pages, 12 figures, 2 tabelsHigh Energy Physics - Phenomenologytext