Oscillating neutrinos and mu -> e,gamma

Citation
Ja. Casas et A. Ibarra, Oscillating neutrinos and mu -> e,gamma, NUCL PHYS B, 618(1-2), 2001, pp. 171-204
Citations number
69
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
NUCLEAR PHYSICS B
ISSN journal
0550-3213 → ACNP
Volume
618
Issue
1-2
Year of publication
2001
Pages
171 - 204
Database
ISI
SICI code
0550-3213(200112)618:1-2<171:ONAM-E>2.0.ZU;2-P
Abstract
If neutrino masses and mixings are suitable to explain the atmospheric and solar neutrino fluxes, this amounts to contributions to FCNC processes, in particular mu --> e, gamma. If the theory is supersymmetric and the origin of the masses is a see-saw mechanism, we show that the prediction for BR(mu --> e, gamma) is in general larger than the experimental upper bound, espe cially if the largest Yakawa coupling is O(l) and the solar data are explai ned by a large angle MSW effect, which recent analyses suggest as the prefe rred scenario. Our analysis is bottom-up and completely general, i.e., it i s based just on observable low-energy data. The work generalizes previous r esults of the literature, identifying the dominant contributions. Applicati on of the results to scenarios with approximate top-neutrino unification, l ike SO(10) models, rules out most of them unless the leptonic Yukawa matric es satisfy very precise requirements. Other possible ways-out, like gauge m ediated SUSY breaking, are also discussed. (C) 2001 Elsevier Science B.V. A ll rights reserved.