Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2009-09-08
Phys.Rev.D80:091301,2009
Physics
High Energy Physics
High Energy Physics - Phenomenology
5 pages, 3 figures; minor changes in the text; references added; matches version published in PRD (Rapid Communications)
Scientific paper
10.1103/PhysRevD.80.091301
Solar and KamLAND data are in slight tension when interpreted in the standard two-flavor oscillations framework and this may be alleviated allowing for a non-zero value of the mixing angle theta_13. Here we show that, likewise, non-standard flavor-changing interactions (FCI), possibly intervening in the propagation of solar neutrinos, are equally able to alleviate this tension and therefore constitute a potential source of confusion in the determination of theta_13. By performing a full three-flavor analysis of solar and KamLAND data in presence of FCI we provide a quantitative description of the degeneracy existing between theta_13 and the vectorial coupling eps_e\tau^dV characterizing the non-standard transitions between nu_e and nu_tau in the forward scattering process with d-type quarks. We find that couplings with magnitude eps_e\tau^dV ~ 10%, compatible with the existing bounds, can mimic the non-zero values of theta_13 indicated by the latest analyses.
Palazzo Antonio
Valle Jose W. F.
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