Hint of non-standard dynamics in solar neutrino conversion

Details Hint of non-standard dynamics in solar neutrino conversion Hint of non-standard dynamics in solar neutrino conversion

2011-01-20

arxiv.org/abs/1101.3875v2

Phys.Rev.D83:101701,2011

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 4 figures; one figure added; minor changes in the text; references added; matches version published in PRD (Rapid Com

Scientific paper

10.1103/PhysRevD.83.101701

Motivated by the recent low-threshold measurements of the solar 8B neutrino spectrum performed by Borexino, Super-Kamiokande and the Sudbury Neutrino Observatory -- all now monitoring the transition regime between low-energy (vacuum-like) and high-energy (matter-dominated) flavor conversions -- we consider the role of sub-dominant dynamical terms induced by new flavor-changing interactions. We find that the presence of such perturbations with strength ~ 0.1 G_F is now favored, offering a better description of the anomalous behavior suggested by the new results, whose spectrum shows no sign of the typical low-energy upturn predicted by the standard MSW mechanism. Our findings, if interpreted in a 2-flavor scheme, provide a hint of such new interactions at the ~ 2 sigma level, which is rather robust with respect to 3-flavor effects possibly induced by non-zero theta_13.

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