Charged lepton contributions to the solar neutrino mixing and theta_13

Details Charged lepton contributions to the solar neutrino mixing and theta_13 Charged lepton contributions to the solar neutrino mixing and theta_13

2004-02-24

arxiv.org/abs/hep-ph/0402258v2

Phys.Rev. D70 (2004) 013003

Physics

High Energy Physics

High Energy Physics - Phenomenology

10 pages, 1 figure

Scientific paper

10.1103/PhysRevD.70.013003

A charged lepton contribution to the solar neutrino mixing induces a contribution to theta_13, barring cancellations/correlations, which is independent of the model building options in the neutrino sector. We illustrate two robust arguments for that contribution to be within the expected sensitivity of high intensity neutrino beam experiments. We find that the case in which the neutrino sector gives rise to a maximal solar angle (the natural situation if the hierarchy is inverse) leads to a theta_13 close to or exceeding the experimental bound depending on the precise values of theta_12, theta_23, an unknown phase and possible additional contributions. We finally discuss the possibility that the solar angle originates predominantly in the charged lepton sector. We find that the construction of a model of this sort is more complicated. We comment on a recent example of natural model of this type.

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