摘要: Theory suggests the existence of neutrino masses, but little more. Facts are coming close to revealing our fantasy: solar- and atmospheric-neutrino data strongly indicate need for conversions, while LSND provides an intriguing hint. The simplest ways reconcile these in terms oscillations invoke a light sterile addition three active ones. Out four neutrinos, two maximally mixed lie at scale, others solar-mass scale. These schemes can be distinguished neutral-current-sensitive experiments. I discuss theoretical scenarios, where lightness neutrino, nearly maximal mixing generation Δm ⊙ 2 atm all follow naturally from assumed lepton-number symmetry its breaking. Although most likely interpretation present is neutrino-mass-induced oscillations, one still has room alternative explanations, such as flavor-changing interactions, with no mass or mixing. Such flavor-violating transitions arise theories strictly massless neutrinos may lead other sizeable flavor non-conservation effects, μ → e + γ, − conversion nuclei, unaccompanied by neutrinoless double-beta decay.
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