par Alonso, Rodrigo;Dhen, Mikaël 
;Gavela, M. B.;Hambye, Thomas
Référence Journal of High Energy Physics, 1301, 118, page (32)
Publication Publié, 2012
;Gavela, M. B.;Hambye, Thomas Référence Journal of High Energy Physics, 1301, 118, page (32)
Publication Publié, 2012
Article révisé par les pairs
| Résumé : | We compute the μ → e conversion in the type-I seesaw model, as a function of the right-handed 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 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. 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. © 2013 SISSA, Trieste, Italy. |
