DESY Hamburg - Lecture Hall 1 Physics
Muon conversion to electron in nuclei in type-I seesaw models
The talk will be based on the paper arXiv:1209.2679, in which is computed the μ → e conversion in the type-I seesaw model, as a function of the right-handed neutrino mixings and masses. The definite predictions will be presented and discussed. In particular, 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 flavor transition: μ → eγ and μ → eee. Indeed, for a quasi-degenerate mass spectrum of right-handed 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. Furthermore, it turns out that planned μ → e conversion experiments would be sensitive to masses as low as 2 MeV. Finally, taking into account other experimental constraints, future μ → e conversion experiments will be fully relevant to detect or constrain sterile neutrino scenarios in the 2 GeV−1000 TeV mass range.