In a previous paper, we presented a three-flavor oscillation analysis of the solar neutrino measurements and of the first data from the KamLAND experiment, in terms of the relevant mass-mixing parameters (δm2,θ12,θ13). The analysis, performed by including the terrestrial neutrino constraints coming from the CHOOZ (reactor), KEK-to-Kamioka (K2K, accelerator), and Super-Kamiokande (SK, atmospheric) experiments, provided a stringent upper limit on θ13, namely, sin2θ13<0.05 at 3σ. We reexamine such an upper bound in light of a recent (although preliminary) reanalysis of atmospheric neutrino data performed by the SK Collaboration, which seems to shift the preferred value of the largest neutrino square mass difference Δm2 downwards. By taking the results of the SK official reanalysis at face value, and by repeating the analysis of our previous paper with such new input, we find that the upper bound on θ13 is somewhat relaxed: sin2θ13<0.067 at 3σ. Related phenomenological issues are briefly discussed.

addendum to: Solar neutrino oscillation parameters from first KamLand results

MONTANINO, Daniele;
2004

Abstract

In a previous paper, we presented a three-flavor oscillation analysis of the solar neutrino measurements and of the first data from the KamLAND experiment, in terms of the relevant mass-mixing parameters (δm2,θ12,θ13). The analysis, performed by including the terrestrial neutrino constraints coming from the CHOOZ (reactor), KEK-to-Kamioka (K2K, accelerator), and Super-Kamiokande (SK, atmospheric) experiments, provided a stringent upper limit on θ13, namely, sin2θ13<0.05 at 3σ. We reexamine such an upper bound in light of a recent (although preliminary) reanalysis of atmospheric neutrino data performed by the SK Collaboration, which seems to shift the preferred value of the largest neutrino square mass difference Δm2 downwards. By taking the results of the SK official reanalysis at face value, and by repeating the analysis of our previous paper with such new input, we find that the upper bound on θ13 is somewhat relaxed: sin2θ13<0.067 at 3σ. Related phenomenological issues are briefly discussed.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11587/107153
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