Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2002-09-12
Nucl.Phys.Proc.Suppl.118:87-96,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, latex, 7 figures. Invited talk given at the XXth International Conference on Neutrino Physics and Astrophysics, ``Ne
Scientific paper
10.1016/S0920-5632(03)01307-0
Recent SNO results give strong evidence that the solar neutrinos undergo the flavor conversion. Main issue now is the identification of the mechanism of conversion. The LMA MSW solution with $\Delta m^2 = (5 - 7) \cdot 10^{-5}$ eV$^2$, $\tan^2 \theta = 0.35 - 0.45$ looks rather plausible: it fits well the experimental data and our new theoretical prejudices. In the LMA case, KamLAND should see (0.5 - 0.7) reduced signal. VAC-QVO and LOW are accepted at about $3\sigma$-level. The SMA solution is practically excluded. No sub-leading effects produced by $U_{e3}$ and admixture of sterile neutrino have been found. The fit becomes worse with increase of $U_{e3}$ (for LMA) and the $\nu_s$ admixture. Still (30 - 50)% presence of the sterile neutrino is allowed. Solutions based on the neutrino spin-flip in the magnetic fields of the Sun as well as on non-standard neutrino interactions give good fit of the data. If KamLAND confirms LMA MSW, the spin-flip and non-standard interactions can be considered (and will be searched for) as sub-leading effects.
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