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Charged lepton contributions to the solar neutrino mixing and θ13

Andrea Romanino

  • CERN, Department of Physics, Theory Division, CH–1211 Geneva 23, Switzerland

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Phys. Rev. D 70, 013003 – Published 27 July, 2004

DOI: https://doi.org/10.1103/PhysRevD.70.013003

Abstract

A charged lepton contribution to the solar neutrino mixing induces a contribution to θ13, barring cancellations or 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 θ13 close to or exceeding the experimental bound depending on the precise values of θ12, θ23, 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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Phys. Rev. D 70, 013003– Published 27 July, 2004
  • Received 3 March 2004

© 2004 American Physical Society

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