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A soft origin for CKM-type CP violation |
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| Authors: | P.M. Ferreira L. Lavoura |
| Affiliation: | a Instituto Superior de Engenharia de Lisboa, 1959-007 Lisboa, Portugal b Centro de Física Teórica e Computacional, Universidade de Lisboa, 1649-003 Lisboa, Portugal c Centro de Física Teórica de Partículas, Instituto Superior Técnico, 1049-001 Lisboa, Portugal |
| Abstract: | We present a two-Higgs-doublet model, with a Z3 symmetry, in which CP violation originates solely in a soft (dimension-2) coupling in the scalar potential, and reveals itself solely in the CKM (quark mixing) matrix. In particular, in the mass basis the Yukawa interactions of the neutral scalars are all real. The model has only eleven parameters to fit the six quark masses and the four independent CKM-matrix observables. We find regions of parameter space in which the flavour-changing neutral couplings are so suppressed that they allow the scalars to be no heavier than a few hundred GeV. |
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