I found this paper that summarizes a few models: http://arxiv.org/abs/1202.2866 But it just looks like just a play on trying to put extra parameters rather than something seen in the context of a novel theory. Does anyone have a clue to a more theory could that could fit? Also, some say that the value calculated within the SM is just bad approximated. I read at ressonaances blog http://resonaances.blogspot.com/2011...ics-maybe.html [Broken] , that the region right above 1GeV is now man`s land, which might explain the bigger than expected charm CP violation. What method is usually used around these values?