2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/182558It is proved that the minimum of a general two Higgs doublet models' potential is stable at tree level. A relation between stability and flavour changing neutral currents at tree level is shown.Prepared for the Proceedings of The International Conference on High Energy and Mathematical Physics, Marrakech, Morocco, 3-7 April 2005. Talk presented by R. Santos. 8 pages and 1 figureHigh Energy Physics - Phenomenologytext