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Enhancing $l_i \to 3 l_j$ with the $Z^0$-penguin · Around

2012

Enhancing $l_i \to 3 l_j$ with the $Z^0$-penguin

Hirsch, M., Staub, F., Vicente, A.

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Lepton flavor violation (LFV) has been observed in neutrino oscillations.

For charged lepton FV decays only upper limits are known, but sizable branching ratios are expected in many neutrino mass models.
High scale models, such as the classical supersymmetric seesaw, usually predict that decays $l_i \to 3 l_j$ are roughly a factor $\alpha$ maller than the corresponding decays $l_i \to l_j \gamma$.
Here we demonstrate that the $Z^0$-penguin diagram can give an enhancement for decays $l_i \to 3 l_j$ in many extensions of the MSSM.

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