CP phases in models with some fermion masses vanishing and/or degenerate Águila Giménez, Francisco Del Zrałek, M. Violation Matrices We count the number of CP breaking phases in models with SU(2)L× U(1)Y and SU(2)L× SU(2)R× U(1)B−L electroweak gauge groups and extended matter contents with some fermion masses vanishing and/or degenerate. Quarks and leptons, including Majorana neutrinos, are treated in a similar way. CP violation is characterized in the mass-eigenstate and in the weak-eigenstate bases. Necessary and sufficient conditions for CP conservation, invariant under weak basis redefinitions are also studied in these models. CP violating factors entering in physical observables and only invariant under phase redefinitions are discussed. 2014-07-01T08:56:33Z 2014-07-01T08:56:33Z 1996 info:eu-repo/semantics/article Águila, F.; Zralek, M. CP phases in models with some fermion masses vanishing and/or degenerate. Acta Physica Polonica B, 27(4): 971-983 (1996). [http://hdl.handle.net/10481/32421] 0587-4254 1509-5770 http://hdl.handle.net/10481/32421 eng http://creativecommons.org/licenses/by-nc-nd/3.0/ info:eu-repo/semantics/openAccess Creative Commons Attribution-NonCommercial-NoDerivs 3.0 License Jagiellonian University