Connecting Low Energy Leptonic CP-violation to Leptogenesis

It was commonly thought that the low energy leptonic CP-violating phases do not enter explicitly into the final expression for the baryon asymmetry in the leptogenesis scenario and therefore no direct link exists between leptogenesis and the low energy CP-violation in the neutrino sector. This conclusion does not hold when the issue of flavour is relevant and properly taken into account in leptogenesis: the baryon asymmetry may even arise uniquely from the low energy leptonic CP-violation whose observation would ensure the existence of a baryon asymmetry. We illustrate this point with various examples studying the correlation between the baryon asymmetry and CP-violating phases in neutrino oscillations and in the effective Majorana mass in neutrinoless double beta decay.