  The complex Clebsch-Gordon coefficients in the double tetrahedral group T'
offers the possibility that CP violation can be entirely geometrical in origin,
as pointed out by us recently. In this note, we investigate leptogenesis in a
SUSY SU(5) x T' model, which gives rise to realistic quark masses and CKM
matrix elements, a near tri-bimaximal neutrino mixing pattern, as well as CP
violating measures for all quarks and leptons. In terms of 9 independent
parameters in the Yukawa sector, the predicted values of the 22 observables
agree with current experimental values, including the recent T2K and MINOS
results. The correction to the tri-bimaximal mixing pattern is related to the
Cabibbo angle, leading to interesting quark-lepton complementarity sum rules.
Our predicted value for the leptonic Dirac CP phase is 227 degrees, which gives
rise to sufficient amount of lepton number asymmetry, in the presence of the
flavor effect. As this is the only non-vanishing CP violating phase in the
lepton sector, there is a direct connection between leptogenesis and CP
violation in neutrino oscillation in our model.
