Massive Neutrinos and Flavour Violation

Abstract

In spite of the large lepton flavour violation (LFV) observed in neutrino oscillations, within the Standard Model, we do \textit{not} expect any visible LFV in the charged lepton sector ($\mu \to e,\gamma$, $\tau \to \mu ,\gamma$, etc.). On the contrary, the presence of new physics close to the electroweak scale can enhance the amplitudes of these processes. We discuss this in general and focus on a particularly interesting case: the marriage of low-energy supersymmetry (SUSY) and seesaw mechanism for neutrino masses (SUSY seesaw). Several ideas presented in this context are reviewed both in the bottom-up and top-down approaches. We show that there exist attractive models where the rate for LFV processes can attain values to be probed in pre-LHC experiments.

23 pages, 5 figures. Submitted to the New Journal of Physics, focus Issue on 'Neutrino Physics' edited by F. Halzen, M. Lindner and A. Suzuki. v2: Added references and corrected typos. To be published version

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