In this work, I re-investigate the relation between the weak basis invariants (WB) related to CP violation at high energy and CP violation relevant at low energy. In this regard, for all the four experimental viable cases pertaining to Framp-ton-Glashow and Yanagida (FGY) model, I reconstruct all the six WB invariants relevant at high energy in terms of low energy left-handed Majorana neutrino mass matrix elements, and thus finding the necessary and sufficient condition for CP invariance at high energy. Further for the viable cases, I have attempted to show the explicit dependence of WB invariants on Dirac type and Majorana type CP violating phase. In the end, I discuss the implication of such interrelationships on leptogenesis.

WB Invariants, FGY Model, Leptogenesis