1993/10/04 by Mar Bastero-Gil, M. Bastero-Gil, Juan Pérez‐Mercader +1 · 1 citation
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions #hep-ph
paper · pdf · doi:10.1016/0370-2693(94)91165-7
published as Phys.Lett.B322:355-362,1994 · 18 pages,LAEFF-93/014,REVTEX-2.1, 5 figures not included, available upon request (include FAX number)#
arxiv created 1993/10/04 · openalex publication_date 1994/02/01 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
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 α3(mZ) 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.