Physics
Scientific paper
Oct 2000
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2000aipc..540..203c&link_type=abstract
PARTICLE PHYSICS AND COSMOLOGY: Second Tropical Workshop. AIP Conference Proceedings, Volume 540, pp. 203-212 (2000).
Physics
Neutrino Mass And Mixing, Ordinary Neutrinos (Nuw Bosons, Non-Standard-Model Neutrinos, Right-Handed Neutrinos, Etc.
Scientific paper
A neutrino mass-mixing scheme which explains qualitatively all present evidence for neutrino mass (the solar and atmospheric neutrino deficits, LSND, and significant hot dark matter) also successfully avoids the ``alpha effect'', allowing r-process nucleosynthesis in the neutrino-heated ejecta of supernovae. The properties of neutrinos required to ensure production of heavy nuclei provides independent evidence for (1) at least one light sterile neutrino, νs (2) a near maximally-mixed νμ-ντ doublet (which also explains the atmospheric anomaly and provides hot dark matter) split from a lower mass νe-νs doublet (needed also for the solar νe deficit); (3) νμ-νe mixing >~10-4 and (4) a splitting between the doublets (measured by the νμ-νe mass difference) >~1 eV2, favoring the upper part of the LSND range. There is a quantitative problem with the solar observations, which do not in detail fit this or any other model. If, however, the νs is a bulk neutrino in extra dimensions the nearness in mass of the zero mode to the νe provides vacuum oscillations, while the Kaluza-Klein states give MSW oscillations, and all the solar data can be fit. .
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