We study flavour violation in a supersymmetric SO(10) implementation of the type II seesaw mechanism, which provides a predictive realization of triplet leptogenesis. The experimental upper bounds on lepton flavour violating processes have a significant impact on the leptogenesis dynamics, in particular they exclude the strong washout regime. Requiring successful leptogenesis then constrains the otherwise largely unknown overall size of flavour-violating observables, thus yielding testable predictions. In particular, the branching ratio for mu -> e gamma lies within the reach of the MEG experiment if the superpartner spectrum is accessible at the LHC, and the supersymmetric contribution to epsilon(K) can account for a significant part of the experimental value. We show that this scenario can be realized in a consistent SO(10) model achieving gauge symmetry breaking and doublet-triplet splitting in agreement with the proton decay bounds, improving on the MSSM prediction for alpha(3)(m(Z)), and reproducing the measured quark and lepton masses.
|Titolo:||Flavour violation in supersymmetric SO(10) unification with a type II seesaw mechanism|
|Autori:||Calibbi L; Frigerio M; Lavignac S; Romanino A|
|Rivista:||JOURNAL OF HIGH ENERGY PHYSICS|
|Data di pubblicazione:||2009|
|Digital Object Identifier (DOI):||10.1088/1126-6708/2009/12/057|
|Appare nelle tipologie:||1.1 Journal article|