Large mixing angle solution to the solar neutrino problem and random matter density perturbations

Abstract

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(2θ), 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(2θ) ~ 0.6 and Delta_m^2~2e-5 eV^2, for random density fluctuations of order 5% < ξ< 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.

References and discussion added, with some small numerical corrections implemented

References in corpus (7)

• Direct Evidence for Neutrino Flavor Transformation from Neutral-Current Interactions in the Sudbury Neutrino Observatory
• First Results from KamLAND: Evidence for Reactor Anti-Neutrino Disappearance
• Measurement of the rate of nu_e + d --> p + p + e^- interactions produced by 8B solar neutrinos at the Sudbury Neutrino Observatory
• Measurement of Day and Night Neutrino Energy Spectra at SNO and Constraints on Neutrino Mixing Parameters
• Helioseismology
• LMA MSW solution of the solar neutrino problem and first KamLAND results
• Large mixing angle oscillations as a probe of the deep solar interior

Cited by in corpus (13)

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• Probing non-standard decoherence effects with solar and KamLAND neutrinos
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• Contrasting solar and reactor neutrinos with a non-zero value of theta13
• Cornering Solar Radiative-Zone Fluctuations with KamLAND and SNO Salt
• Enhanced solar anti-neutrino flux in random magnetic fields
• Dissipative neutrino oscillations in randomly fluctuating matter
• Quantum flavor oscillations extended to the Dirac theory
• Probing a panoply of curvaton-decay scenarios using CMB data
• Dynamics of chiral oscillations - A comparative analysis with spin-flipping
• Metastable and stable equilibrium states of stellar electron-nuclear plasmas
• Random magnetic fields inducing solar neutrino spin-flavor precession in a three generation context