Regular Article - Theoretical Physics
A4 model for the quark mass matrices
Centro de Física Teórica de Partículas, Instituto Superior Técnico, 1049-001, Lisboa, Portugal
2 Fakultät für Physik, Universität Wien, Boltzmanngasse 5, 1090, Wien, Austria
Revised: 28 January 2008
Published online: 8 March 2008
We propose a model for the quark masses and mixings based on an A4 family symmetry. Three scalar SU(2) doublets form a triplet of A4. The three left-handed-quark SU(2) doublets are also united in a triplet of A4. The right-handed quarks are singlets of A4. The A4-symmetric scalar potential leads to a vacuum in which two of the three scalar SU(2) doublets have expectation values with equal moduli. Our model makes an excellent fit of the observed |Vub/Vcb|. CP symmetry is respected in the charged gauge interactions of the quarks.
© Springer-Verlag , 2008