Hint of nonstandard Mikheyev-Smirnov-Wolfenstein dynamics in solar neutrino conversion

摘要: Motivated by the recent low-threshold measurements of solar $^{8}\mathrm{B}$ neutrino spectrum performed Borexino, Super-Kamiokande and Sudbury Neutrino Observatory---all now monitoring transition regime between low-energy (vacuumlike) high-energy (matter-dominated) flavor conversions---we consider role subdominant dynamical terms induced new flavor-changing interactions. We find that presence such perturbations with strength $\ensuremath{\sim}{10}^{\ensuremath{-}1}{G}_{F}$ is favored, offering a better description anomalous behavior suggested results, whose shows no sign typical upturn predicted standard Mikheyev-Smirnov-Wolfenstein (MSW) mechanism. Our findings, if interpreted in 2-flavor scheme, provide hint interactions at $\ensuremath{\sim}2\ensuremath{\sigma}$ level, which rather robust respect to 3-flavor effects possibly nonzero ${\ensuremath{\theta}}_{13}$.