Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1999-06-04
Ann.Rev.Nucl.Part.Sci.49:481-528,1999
Physics
High Energy Physics
High Energy Physics - Phenomenology
43 pages, 8 figures, to appear in the Annual Review of Nuclear and Particle Science, Vol. 49 (1999)
Scientific paper
10.1146/annurev.nucl.49.1.481
The question of neutrino mass is one of the major riddles in particle physics. Recently, strong evidence that neutrinos have nonzero masses has been found. While tiny, these masses could be large enough to contribute significantly to the mass density of the universe. The evidence for nonvanishing neutrino masses is based on the apparent observation of neutrino oscillation -- the transformation of a neutrino of one type or "flavor" into one of another. We explain the physics of neutrino oscillation, and review and weigh the evidence that it actually occurs in nature. We also discuss the constraints on neutrino mass from cosmology and from experiments with negative results. After presenting illustrative neutrino mass spectra suggested by the present data, we consider how near- and far-future experiments can further illuminate the nature of neutrinos and their masses.
Fisher Peter
Kayser Boris
McFarland Kevin S.
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