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Usual leptogenesis scenarios involve the interference of tree level and loop level decay of the so called right handed neutrino (RHN) into the standard model leptons and requires at least two different flavours of RHN with different Yukawa couplings. The interference causes CP violation. In this talk, however, we look at a means of creating a lepton asymmetry without involving quantum loop effects. CP violation occurs due to time evolution of the oscillating particle and antiparticle states. To begin with, we will show how such a CP violation can be created, followed by using a model to implement this. We will use the NMSSM extended by a singlet right-handed neutrino superfield which will allow us to produce CP violation without invoking thermal effects that are necessary for implementing the setup in MSSM. |