Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2008-11-13
Physics
High Energy Physics
High Energy Physics - Phenomenology
8 pages, 12 figures
Scientific paper
A model for the violation of the equivalence principle (VEP) on solar and reactor neutrinos is investigated. New limits for the VEP are obtained considering the mass-flavor mixing hypothesis and the VEP model. The search for an upper bound for VEP effects led to a possible solution where usual parameters $\tan^2\theta$ and $\Delta m^2$ are practically unchanged. The set of best fit point parameters is given by $|\phi\Delta\gamma|=6.0_{-2.3}^{+3.1}\times10^{-20}$, $\tan^2\theta=0.478_{-0.038}^{+0.040}$ and $\Delta m^2=7.20_{-0.27}^{+0.35}\times10^{-5} eV^2$. This possible solution has increased the confidence level when compared with the MSW-only solution ($\tan^2\theta=0,462^{+0,043}_{-0,036}$ and $\Delta m^2=7,75^{+0,16}_{-0,12}\times10^{-5} eV^2$). A superior limit for VEP parameters has also been obtained: $|\phi\Delta\gamma|\le 3.9\times10^{-20}$($3\sigma$).
Guzzo Marcelo M.
Holanda C~de P.
Valdiviesso G. A.
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