Dias, A. G.Pires, CASPleitez, Vda Silva, PSR2014-05-202014-05-202005-08-11Physics Letters B. Amsterdam: Elsevier B.V., v. 621, n. 1-2, p. 151-159, 2005.0370-2693http://hdl.handle.net/11449/23284We show that in SU(3)(C) circle times SU(3)(L) circle times U(1)(N) (3-3-1) models embedded with a singlet scalar playing the role of the axion, after imposing scale invariance, the breaking of Peccei-Quinn symmetry occurs through the one-loop effective potential for the singlet field. We, then, analyze the structure of spontaneous symmetry breaking by studying the new scalar potential for the model, and verify that electroweak symmetry breaking is tightly connected to the 3-3-1 breaking by the strong constraints among their vacuum expectation values. This offers a valuable guide to write down the correct pattern of symmetry breaking for multi-scalar theories. We also obtained that the accompanying massive pseudo-scalar, instead of acquiring mass of order of Peccei-Quinn scale as we would expect, develops a mass at a much lower scale, a consequence solely of the breaking via Coleman-Weinberg mechanism. (c) 2005 Published by Elsevier B.V.151-159engeffective potential3-3-1 modelspontaneous symmetry breakingArtigo10.1016/j.physletb.2005.06.048WOS:000231105400019Acesso restrito67834333902357270000-0001-5279-8438