2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/49265The introduction of strongly-interacting mirror fermions with masses between the weak scale and 1 TeV could offer a viable alternative to the Higgs mechanism. The framework provided solves the hierarchy problem naturally and predicts a rich phenomenology for present and future experiments.Talk given at the International Europhysics Conference HEP99 in Tampere (Finland) on July 16, 1999, to appear in the proceedingsHigh Energy Physics - Phenomenologytext