1994/01/17 by Enrico Nardi, Nardi, Enrico
Physics and Astronomy · #Dark Matter and Cosmic Phenomena #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #Neutrino Physics Research #Particle physics theoretical and experimental studies #hep-ph
paper · pdf · doi:10.48550/arxiv.hep-ph/9401275
Talk given at the ``International School on Cosmological Dark Matter'' Valencia, Spain, October 4-8, 1993, Plain Tex, 8 pages + 2 figures available upon request ([email protected])
arxiv created 1994/01/17 · openalex publication_date 1994/01/17 · arxiv updated 2009/11/30 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/01
Superstring derived \E models can accommodate small neutrino masses if a discrete symmetry is imposed which forbids tree level Dirac neutrino masses but allows for radiative mass generation. The only possible symmetries of this kind are known to be generation dependent. We explore the possibility that, as a consequence of such a symmetry, the three sets of light states in each generation do not have the same assignments with respect to the \bf 27 of E6, implying that the gauge interactions under the additional U(1)^\pr factors are non universal. Models realising such a scenario are found to be viable, and by requiring the number of light neutral states to be minimal, an almost unique pattern of neutrino masses and mixings arises. We briefly discuss a model in which, with a natural choice of the parameters, mντ∼ 0.1-10 eV is generated at one loop, mνμ ∼ 10-3 eV is generated at two loops and νe remains massless.