Neutrino masses in supersymmetry with spontaneously broken R parity
Oct 4, 199122 pages
Published in:
- Nucl.Phys.B 381 (1992) 87-108
- Published: 1992
Report number:
- FTUV-91-37,
- IFIC-91-35
Citations per year
Abstract: (Elsevier)
The neutrino mass spectrum that arises in supersymmetry models with spontaneously broken R -parity is studied in detail. We analyse the attainable values for m ν e , m ν μ and m ν τ , once all observational constraints have been incorporated, including both those that arise from collider experiments such as LEP, as well as weak interaction constraints, such as the non-observation of neutrinoless double-β decay, the limits from neutrino oscillation searches, etc. For natural choices of the parameters neutrino masses arise in a very striking pattern: while ν e and ν μ have masses lying in the adequate range for the explanation of the observed deficit in the solar neutrino flux via the MSW effect, the ν τ mass is large enough to lead to novel signatures associated with the τ-lepton that could be seen both a LEP as well as at a tau factory. These provide an additional tool to probe the parameters characterizing the solar neutrino conversions in conventional accelerator experiments. The related processes include the single-chargino Z-decay branching ratio BR ( Z → χ τ) as large as ∼ 6 × 10 −5 and single-majoron emission τ-decay branching ratios τ → μ + J as large as ∼ 10 −4 corresponding to solar neutrino oscillation parameters in the non-adiabatic branch favoured by present solar neutrino data. The τ-neutrino is naturally much heavier than ν μ and decays to it via majoron emission, with a lifetime short enough to obey cosmological limits.- neutrino: mass spectrum
- mass spectrum: neutrino
- neutrino: oscillation
- neutrino: solar
- neutrino: flux
- flux: neutrino
- supersymmetry
- R parity: spontaneously broken
- spontaneously broken: R parity
- neutrino: Majorana
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