"In the representative models... it has been found that successful leptogenesis is only possible in a very fine-tuned region of the parameter space. Specifically, one must select the f = u case, as well as certain combinations of Dirac and Majorana phases in UPMNS such that a lepton asymmetry can be generated via either resonant of flavoured N2-leptogenesis. Further, it has been shown that although the f = e case can yield a TeV scale RH neutrino, the probability of detecting it at the LHC or a next-generation collider such as the ILC is far too small."