Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2006-07-06
Nucl.Phys.B763:228-246,2007
Physics
High Energy Physics
High Energy Physics - Phenomenology
19 pages, 9 figures; v2: new appendix, added note on hep-ph/0609067, and other minor modifications
Scientific paper
10.1016/j.nuclphysb.2006.11.015
We investigate the viability of leptogenesis in models with three heavy right-handed neutrinos, where the charged-lepton and the neutrino Yukawa couplings are the only irreducible sources of lepton-flavour symmetry breaking (Minimal Lepton Flavour Violation hypothesis). We show that in this framework a specific type of resonant leptogenesis can be successfully accomplished. For natural values of the free parameters, this mechanism requires a high right-handed neutrino mass scale ($M_\nu \gsim 10^{12}$ GeV). By means of a general effective field theory approach, we analyse the impact of the CP violating phases responsible for leptogenesis on the low-energy FCNC observables and derive bounds on the scale of flavour violating new physics interactions. As a result of the high value of the scale of total lepton-number violation, in this class of models the $\mu\to e\gamma$ decay is expected to be close to the present exclusion limit (under the additional assumption of new particles carrying lepton flavour at the TeV scale).
Cirigliano Vincenzo
Isidori Gino
Porretti Valentina
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