Abstract
In spite of the large lepton flavour violation (LFV) observed in neutrino oscillations, within the Standard Model, we do not expect any visible LFV in the charged lepton sector (μ → e, γ, τ → μ, γ, 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.
Highlights
Since the last couple of years of the previous century, tremendous progress has been made in our understanding of the nature of the most elusive Standard Model (SM) particles, the neutrinos
If only the neutrinos carry this information on flavour mixing, as in the Standard Model with massive neutrinos, these processes are expected to be proportional to the ratio of masses of neutrinos over the masses of the W bosons, leading to extremely tiny branching ratios
The supersymmetric partners of the leptons, namely the sleptons, carry the same flavour quantum numbers as the SM leptons. Since they are expected to be heavy, around the TeV scale, if flavour mixing is present in the (s)leptonic sector, large branching ratios are expected for the afore-mentioned rare decay processes
Summary
Since the last couple of years of the previous century, tremendous progress has been made in our understanding of the nature of the most elusive Standard Model (SM) particles, the neutrinos. If only the neutrinos carry this information on flavour mixing, as in the Standard Model with massive neutrinos, these processes are expected to be proportional to the ratio of masses of neutrinos over the masses of the W bosons, leading to extremely tiny branching ratios This situation can dramatically change if there are some new additional particles carrying lepton flavour numbers, which have very large masses and simultaneously mix among themselves. The supersymmetric partners of the leptons, namely the sleptons, carry the same flavour quantum numbers as the SM leptons Since they are expected to be heavy, around the TeV scale, if flavour mixing is present in the (s)leptonic sector, large branching ratios are expected for the afore-mentioned rare decay processes. We will mainly concentrate on this class of models
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