Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-03-24
Phys.Lett.B569:45-50,2003
Physics
High Energy Physics
High Energy Physics - Phenomenology
References and discussion added, with some small numerical corrections implemented
Scientific paper
10.1016/j.physletb.2003.07.010
There are reasons to believe that mechanisms exist in the solar interior which lead to random density perturbations in the resonant region of the Large Mixing Angle solution to the solar neutrino problem. We find that, in the presence of these density perturbations, the best fit point in the (sin^2(2\theta), Delta_m^2) parameter space moves to smaller values, compared with the values obtained for the standard LMA solution. Combining solar data with KamLAND results, we find a new compatibility region, which we call VERY-LOW LMA, where sin^2(2\theta) ~ 0.6 and Delta_m^2~2e-5 eV^2, for random density fluctuations of order 5% < \xi< 8%. We argue that such values of density fluctuations are still allowed by helioseismological observations at small scales of order 10 - 1000 km deep inside the solar core.
de Holanda Pedro Cunha
Guzzo Marcelo M.
Reggiani N.
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