https://doi.org/10.1140/epjc/s10052-008-0562-1
Regular Article - Theoretical Physics
A4 model for the quark mass matrices
1
Centro de Física Teórica de Partículas, Instituto Superior Técnico, 1049-001, Lisboa, Portugal
2
Fakultät für Physik, Universität Wien, Boltzmanngasse 5, 1090, Wien, Austria
* e-mail: balio@cftp.ist.utl.pt
** e-mail: helmut.kuehboeck@univie.ac.at
Received:
12
November
2007
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