Radiative origin of solar scale and U_{e3}

Abstract

We make a general study of possibility of generating solar scale ${\Delta }_{\odot }$ and the CHOOZ angle $U_{e3}$ radiatively by assuming that they are zero at some high scale. The most general neutrino mass matrix leading to this result is determined in a CP conserving theory. This matrix contains four independent parameters which can be fixed in terms of physical observables. The standard weak radiative corrections then lead to non-zero ${\Delta }_{\odot }$ and $U_{e3}$ without drastically altering the other tree level results. As a consequence, both ${\Delta }_{\odot }$ and $U_{e3}$ are predicted in terms of other physically observable parameters. These predictions are insensitive to specific form of the neutrino mass matrix. The solar scale and $U_{e3}$ are strongly correlated with the effective neutrino mass $m_{ee}$ probed in neutrinoless double beta decay. In particular, the LMA solution to the solar neutrino problem arise for $m_{ee}$ close to the present experimental limit. An example of specific texture is presented which predicts maximal atmospheric mixing and ${\tan }^2{\theta }_{\odot }\approx 0.5$ for the solar mixing angle ${\theta }_{\odot }$.

Modified version, to appear in Phys. Lett. B

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