$μ\to e γ$ and $τ\to l γ$ decays in the fermion triplet seesaw model

Details $μ\to e γ$ and $τ\to l γ$ decays in the fermion triplet seesaw model $μ\to e γ$ and $τ\to l γ$ decays in the fermion triplet seesaw model

2008-03-04

arxiv.org/abs/0803.0481v2

Phys.Rev.D78:033007,2008

Physics

High Energy Physics

High Energy Physics - Phenomenology

Section on $\mu$-$e$ conversion in nuclei added, version to appear in PRD

Scientific paper

10.1103/PhysRevD.78.033007

In the framework of the seesaw models with triplets of fermions, we evaluate the decay rates of $\mu \to e \gamma$ and $\tau \to l \gamma$ transitions. We show that although, due to neutrino mass constraints, those rates are in general expected to be well under the present experimental limits, this is not necessarily always the case. Interestingly enough, the observation of one of those decays in planned experiments would nevertheless contradict bounds stemming from present experimental limits on the $\mu \to eee$ and $\tau \to 3 l$ decay rates. Such detection of radiative decays would therefore imply that there exist sources of lepton flavour violation not associated to triplet fermions.

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