Are solar neutrino oscillations robust?

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  • 28 June 2004
Abstract
Prompted by the recent 766.3 ton-yr data sample just released by the KamLAND collaboration we have reconsidered the status of the large mixing angle (LMA) oscillation (OSC) interpretation of the data in a more general framework where non-standard neutrino interactions (NSI) are present. Such interactions may be regarded as a generic feature of actual models of neutrino mass. This implies the existence of three LMA solutions, instead of the unique solution which holds in the absence of NSI, LMA-I. Moreover, in addition to the two ``light-side'' OSC+NSI solutions LMA-0 and LMA-I, there is a new ``dark-side'' solution (LMA-D) with sin^2 theta_Sol = 0.70. We give the status of all LMA OSC and OSC+NSI solutions in view of the latest solar and KamLAND data. It is unlikely that more precise KamLAND measurements will resolve the ambiguity in the determination of the solar neutrino mixing angle theta_Sol, as they are expected to constrain mainly Delta m^2. We comment on the potential of future solar neutrino experiments using ^7 Be and ^8B neutrinos to lift the degeneracy between the LMA-I and LMA-D solutions.

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