$\ell_1 \to \ell_2 γ$ in type III seesaw

Details $\ell_1 \to \ell_2 γ$ in type III seesaw $\ell_1 \to \ell_2 γ$ in type III seesaw

2008-05-16

arxiv.org/abs/0805.2506v1

Physics

High Energy Physics

High Energy Physics - Phenomenology

o appear in the Proceedings of the 43rd Rencontres de Moriond EW session, La Thuile, Italy, 1-8 March 2008

Scientific paper

We study the decay rates of the $\mu \to e \gamma$ and $\tau \to \ell \gamma$ transitions in the framework of the type III seesaw model, where fermionic triplets are exchanged to generate neutrino masses. We show that the observation of one of those decays in planned experiments would contradict bounds arising from present experimental limits on the $\mu \to eee$ and $\tau \to 3 l$ decay rates, and therefore imply that there exist other sources of lepton flavour violation than those associated to triplet of fermions.

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