Oscillating neutrinos and ? e, ?

By J. Casas, Alejandro Ibarra. 2001

1,065 citations recorded by the source corpus.

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, especially if the largest Yukawa 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.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/b0b96c58e66f021d4c6959e586aa55067e63dd2e

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In Nuclear and High Energy Physics

Citations in the corpus

Electroweak and Flavour Structure of a Warped Extra Dimension with Custodial Protection (2009, methodology): “In some analogy to the Casas-Ibarra parameterisation [76] in the lepton sector, we therefore aim to derive a parameterisation of the RS flavour sector in terms of the SM quark masses, the CKM parameters, and the parameters of the new flavour mixing matrices DL, UR and DR.”
MFV SUSY: A Natural Theory for R-Parity Violation (2011, methodology): “We use the generic parametrization of the neutrino Yukawa couplings of Casas and Ibarra [31]:”
Reconsidering the one leptoquark solution: flavor anomalies and neutrino mass (2017, methodology): “This expression for the mass matrix can be solved for the xi3a through the Casas-Ibarra procedure [123] to give”