2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/43341Specific quasi-realistic superstring constructions often predict the existence of new TeV-scale physics which may be different in character from bottom-up motivated constructions. I describe examples of such beyond the MSSM physics, with special emphasis on heavy Z' gauge bosons and associated exotic particles. Implications of an extra U(1)' include a viable scienario for electroweak baryogenesis, a highly non-standard light Higgs sector, and Z'-mediated contributions to rare B decays.9 pages, 2 figures, Talk presented at SUSY 2003: Supersymmetry in the Desert, held at the University of Arizona,Tucson, AZ, June 5-10, 2003. To appear in the ProceedingsHigh Energy Physics - Phenomenologytext