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- Stability of the tree-level vacuum in two Higgs doublet models against charge or CP spontaneous violationPublication . Ferreira, P. M.; Santos, R.; Barroso, A.We show that in two Higgs doublet models at tree-level the potential minimum preserving electric charge and CP symmetries, when it exists, is the global one. Furthermore, we derived a very simple condition, involving only the coefficients of the quartic terms of the potential, that guarantees spontaneous CP breaking. (C) 2004 Elsevier B.V. All rights reserved.