Non-vanishing $U_{e3}$ and $\cos{2 θ_{23}}$ from a broken $Z_2$ symmetry

Details Non-vanishing $U_{e3}$ and $\cos{2 θ_{23}}$ from a broken $Z_2$ symmetry Non-vanishing $U_{e3}$ and $\cos{2 θ_{23}}$ from a broken $Z_2$ symmetry

2004-08-10

arxiv.org/abs/hep-ph/0408123v4

Nucl.Phys. B713 (2005) 151-172

Physics

High Energy Physics

High Energy Physics - Phenomenology

28 pages, 12 figures, Some discussions are revised, references are corrected, Conclusions are unchanged

Scientific paper

10.1016/j.nuclphysb.2005.01.049

It is shown that the neutrino mass matrices in the flavour basis yielding a vanishing $U_{e3}$ are characterized by invariance under a class of $Z_2$ symmetries. A specific $Z_2$ in this class also leads to a maximal atmospheric mixing angle $\theta_{23}$. The breaking of that $Z_2$ can be parameterized by two dimensionless quantities, $\e$ and $\e'$; the effects of $\e, \e' \neq 0$ are studied perturbatively and numerically. The induced value of $\ue3$ strongly depends on the neutrino mass hierarchy. We find that $\ue3$ is less than 0.07 for a normal mass hierarchy, even when $\e, \e' \sim 30 %$. For an inverted mass hierarchy $\ue3$ tends to be around 0.1 but can be as large as 0.17. In the case of quasi-degenerate neutrinos, $\ue3$ could be close to its experimental upper bound 0.2. In contrast, $| \cos{2\theta_{23}} |$ can always reach its experimental upper bound 0.28. We propose a specific model, based on electroweak radiative corrections in the MSSM, for $\e$ and $\e'$. In that model, both $\ue3$ and $| \cos{2 \theta_{23}} |$, could be close to their respective experimental upper bounds if neutrinos are quasi-degenerate.

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