Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2005-04-18
JHEP0508:013,2005
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 3 figures, final version for publication in JHEP
Scientific paper
10.1088/1126-6708/2005/08/013
We propose a model for lepton mass matrices based on the seesaw mechanism, a complex scalar gauge singlet and a horizontal symmetry $S_3 \times \mathbbm{Z}_2$. In a suitable weak basis, the charged-lepton mass matrix and the neutrino Dirac mass matrix are diagonal, but the vacuum expectation value of the scalar gauge singlet renders the Majorana mass matrix of the right-handed neutrinos non-diagonal, thereby generating lepton mixing. When the symmetry $S_3$ is not broken in the scalar potential, the effective light-neutrino Majorana mass matrix enjoys $\mu$--$\tau$ interchange symmetry, thus predicting maximal atmospheric neutrino mixing together with $U_{e3} = 0$. A partial and less predictive form of $\mu$--$\tau$ interchange symmetry is obtained when the symmetry $S_3$ is softly broken in the scalar potential. Enlarging the symmetry group $S_3 \times \mathbbm{Z}_2$ by an additional discrete electron-number symmetry $\mathbbm{Z}_2^{(e)}$, a more predicitive model is obtained, which is in practice indistinguishable from a previous one based on the group $D_4$.
Grimus Walter
Lavoura Luis
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