CP phases in models with some fermion masses vanishing and/or degenerate
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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]
PatrocinadorThis work partially supported by the CICYT under contract AEN94-0936, the European Union under contract CHRX-CT92-0004, the Curie-Sklodowska grant MEN/NSF 93-145, and the Polish Committee for Scientific Researches under grants PB 659/P03/95/08 and 2=30225206/93.
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.