Neutrino Mass Constraints on {mu} Decay and {pi}{sup 0}{yields}{nu}{nu}
- Jet Propulsion Laboratory/California Institute of Technology, 4800 Oak Grove Drive, Pasadena, California 91109 (United States)
- Kellogg Radiation Laboratory, California Institute of Technology, Pasadena, California 91125 (United States)
In this Letter, we show that upper limits on the neutrino mass translate into upper limits on the class of neutrino-matter interactions that can generate loop corrections to the neutrino mass matrix. We apply our results to {mu} and {pi} decays and derive model-independent limits on six of the ten parameters used to parametrize contributions to {mu} decay that do not belong to the standard model. These upper limits provide improved constraints on the five Michel parameters, {rho},{xi}{sup '},{xi}{sup ''},{alpha},{alpha}{sup '}, that exceed Particle Data Group constraints by at least one order of magnitude. For {pi}{sup 0}{yields}{nu}{nu} we find, for the branching ratio, B({pi}{sup 0}{yields}{nu}{nu})<10{sup -10}.
- OSTI ID:
- 20699385
- Journal Information:
- Physical Review Letters, Vol. 95, Issue 10; Other Information: DOI: 10.1103/PhysRevLett.95.101802; (c) 2005 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
- Country of Publication:
- United States
- Language:
- English
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