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

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Duerr,  Michael
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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McDonald,  Kristian L.
Division Prof. Dr. Manfred Lindner, MPI for Nuclear Physics, Max Planck Society;

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Citation

Duerr, M., George, D. P., & McDonald, K. L. (2011). Neutrino mass and μ → e + γ from a mini-seesaw. Journal of high energy physics: JHEP, JHEP07: 103. doi:10.1007/JHEP07(2011)103.


Cite as: http://hdl.handle.net/11858/00-001M-0000-000F-1297-B
Abstract
The recently proposed “mini-seesaw mechanism” combines naturally suppressed Dirac and Majorana masses to achieve light Standard Model neutrinos via a lowscale 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 neutrinoless 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.