Authors: R Alonso M Dhen M B Gavela T Hambye
Publish Date: 2013/01/17
Volume: 2013, Issue: 1, Pages: 118-
Abstract
We compute the μ → e conversion in the typeI seesaw model as a function of the righthanded neutrino mixings and masses The results are compared with previous computations in the literature We determine the definite predictions resulting for the ratios between the μ → e conversion rate for a given nucleus and the rate of two other processes which also involve a μ − e flavour transition μ → eγ and μ → eee For a quasidegenerate mass spectrum of righthanded neutrino masses — which is the most natural scenario leading to observable rates — those ratios depend only on the seesaw mass scale offering a quite interesting testing ground In the case of sterile neutrinos heavier than the electroweak scale these ratios vanish typically for a mass scale of order a few TeV Furthermore the analysis performed here is also valid down to very light masses It turns out that planned μ → e conversion experiments would be sensitive to masses as low as 2 MeV Taking into account other experimental constraints we show that future μ → e conversion experiments will be fully relevant to detect or constrain sterile neutrino scenarios in the 2 GeV−1000 TeV mass range
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