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Estimate of θ14 independent of the reactor antineutrino flux determinations

Antonio Palazzo

  • Cluster of Excellence, Origin and Structure of the Universe, Technische Universität München, Boltzmannstraße 2, D-85748 Garching, Germany

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Phys. Rev. D 85, 077301 – Published 3 April, 2012

DOI: https://doi.org/10.1103/PhysRevD.85.077301

Abstract

In a previous paper [Phys. Rev. D 83, 113013 (2011)] we have shown that the solar sector data (solar and KamLAND) are sensitive to the parameter θ14, encoding the admixture of the electron neutrino with a fourth (essentially) sterile mass eigenstate. In that work we evidenced that such data prefer a nonzero value of θ14 and that such a preference is completely degenerate with that of nonzero θ13. In this Report we show how the evidence of θ13>0, recently emerged from global neutrino data analyses, lifts such a degeneracy and disfavors the case of sterile neutrino mixing. By excluding from our analysis the total rate information coming from the reactor experiments we untie our results from any assumption on their flux normalization. In this way, we establish the robust upper bound sin2θ14<0.04 at the 90% C.L.

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Phys. Rev. D 85, 077301– Published 3 April, 2012
  • Received 27 January 2012

© 2012 American Physical Society

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