Seesaw model solutions of the solar neutrino problem

Details Seesaw model solutions of the solar neutrino problem Seesaw model solutions of the solar neutrino problem

Apr 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992nuphb.374..373b&link_type=abstract

Nuclear Physics B, Volume 374, Issue 2, p. 373-391.

Physics

Nuclear Physics

52

Scientific paper

We re-examine solutions to the solar neutrino oscillations, decaying neutrinos and a cooler center of the sun. Comparison of the Homestake and Kamiokande II observations implies that low-energy neutrinos are more suppressed than high-energy, disfavoring the large-mass adiabatic MSW resonance and allowing us to exclude non-standard solar models with a simple reduction of core temperature. Diagonal (sin22θ - 0.004-0.5, Δm2 ⋍ 0.08-10 meV2), vertical large-angle (sin2 ⋍ 0.6-0.9, Δm2 ⋍ 0.08-2, 4-60 meV2), and part of the horizontal (sin22θ ⋍ 0.02-0.6, Δm2 ⋍ 80 meV2) MSW solutions are compatible with these data (meV = 10-3 eV). The present SAGE results disfavor non-standard solar models and the horizontal MSW solution. Assuming νe --> νμ conversion, we show that seesaw models of neutrino masses imply mνμ = 0.3-9 meV, intermediate-scale symmetry breaking O(109-1012) GeV, and a τ-neutrino mass with cosmological ramifications in some cases and laboratory or atmospheric νμ - ντ oscillations. While seesaw predictions for neutrino masses are model-dependent and subject to large uncertainties, we prove that leptonic mixing angles are similar to quark mixings for a wide range of models. We also present two specific seesaw models compatible with electroweak neutral current and proton decay constraints, including radiative corrections to the seesaw predictions.

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