1998/09/02 by J. W. F. Valle, Jose W. F. Valle, Valle, Jose W. F.
Physics and Astronomy · #Astrophysics (astro-ph) #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Nuclear Experiment (nucl-ex) #Particle physics theoretical and experimental studies #astro-ph #hep-ex #hep-ph #nucl-ex
paper · pdf · doi:10.48550/arxiv.hep-ph/9809234
LaTeX, 30 pages, 16 PS figures, corrects misprints and a few references. To appear in Proceedings of New Trends in Neutrino Physics, May 1998, Ringberg Castle, Tegernsee, Germany. Presented also as a set of three lectures at the V Gleb Wataghin School on High Energy Phenomenology, Campinas, Brazil, July 1998
openalex publication_date 1998/09/02 · arxiv created 1998/09/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
I review the status of neutrino physics post-Neutrino~98, including the implications of solar and atmospheric neutrino data, which strongly indicate nonzero neutrino masses. LSND and the possible role of neutrinos as hot dark matter (HDM) are also mentioned. The simplest schemes proposed to reconcile these requirements invoke a light sterile neutrino in addition to the three active ones, two of them at the MSW scale and the other two maximally-mixed neutrinos at the HDM/LSND scale. In the simplest theory the latter scale arises at one-loop, while the solar and atmospheric parameters Δm2_\odot & Δm2atm appear at the two-loop level. The lightness of the sterile neutrino, the nearly maximal atmospheric neutrino mixing, and the generation of Δm2_\odot & Δm2atm follow naturally from the assumed lepton-number symmetry and its breaking. These two basic schemes can be distinguished at future solar & atmospheric neutrino experiments and have different cosmological implications.