PT Journal
AU Aristizabal Sierra, D
   Bazzocchi, F
   de Medeiros Varzielas, I
   Merlo, L
   Morisi, S
TI Tri/Bi-maximal lepton mixing and leptogenesis
SO Nuclear Physics B
JI Nucl. Phys. B
PY 2010
BP 34
EP 58
VL 827
IS 1-2
DI 10.1016/j.nuclphysb.2009.10.009
LA English
AB In models with flavour symmetries added to the gauge group of the Standard Model the CP-violating asymmetry necessary for leptogenesis may be related with low-energy parameters. A particular case of interest is when the flavour symmetry produces exact Tri/Bi-maximal lepton mixing leading to a vanishing CP-violating asymmetry. In this paper we present a model-independent discussion that confirms this always occurs for unflavoured leptogenesis in type I see-saw scenarios, noting however that Tri/Bi-maximal mixing does not imply a vanishing asymmetry in general scenarios where there is interplay between type I and other see-saws. We also consider a specific model where the exact Tri/Bi-maximal mixing is lifted by corrections that can be parametrised by a small number of degrees of freedom and analyse in detail the existing link between low and high-energy parameters – focusing on how the deviations from Tri/Bi-maximal are connected to the parameters governing leptogenesis.
ER