Oscillating neutrinos and μ→e,γ

J. A. Casas, A. Ibarra

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1111 Scopus citations


If neutrino masses and mixings are suitable to explain the atmospheric and solar neutrino fluxes, this amounts to contributions to FCNC processes, in particular μ→e,γ. If the theory is supersymmetric and the origin of the masses is a see-saw mechanism, we show that the prediction for BR(μ→e,γ) is in general larger than the experimental upper bound, especially if the largest Yakawa coupling is O(1) and the solar data are explained by a large angle MSW effect, which recent analyses suggest as the preferred scenario. Our analysis is bottom-up and completely general, i.e., it is based just on observable low-energy data. The work generalizes previous results of the literature, identifying the dominant contributions. Application of the results to scenarios with approximate top-neutrino unification, like SO(10) models, rules out most of them unless the leptonic Yukawa matrices satisfy very precise requirements. Other possible ways-out, like gauge mediated SUSY breaking, are also discussed.

Original languageEnglish
Pages (from-to)171-204
Number of pages34
JournalNuclear Physics, Section B
Issue number1-2
StatePublished - 10 Dec 2001
Externally publishedYes


  • 12.60.Jv
  • 13.35.-r
  • 14.60.Pq


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