Neutrino mass and μ → e + γ from a mini-seesaw

  • Michael Duerr
  • Damien P. George
  • Kristian L. McDonald
Open Access


The recently proposed “mini-seesaw mechanism” combines naturally suppressed Dirac and Majorana masses to achieve light Standard Model neutrinos via a low-scale seesaw. A key feature of this approach is the presence of multiple light (order GeV) sterile-neutrinos that mix with the Standard Model. In this work we study the bounds on these light sterile-neutrinos from processes like μ → e + γ, invisible Z-decays, and neutrino-less double beta-decay. We show that viable parameter space exists and that, interestingly, key observables can lie just below current experimental sensitivities. In particular, a motivated region of parameter space predicts a μ → e + γ branching fraction within the range to be probed by MEG.


Phenomenology of Field Theories in Higher Dimensions 


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© The Author(s) 2011

Open Access This article is distributed under the terms of the Creative Commons Attribution License which permits any use, distribution and reproduction in any medium, provided the original author(s) and source are credited.

Authors and Affiliations

  • Michael Duerr
    • 1
  • Damien P. George
    • 2
  • Kristian L. McDonald
    • 1
  1. 1.Max-Planck-Institut für KernphysikHeidelbergGermany
  2. 2.Nikhef Theory GroupAmsterdamThe Netherlands

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