It seems that Chiral perturbation theory is valid between 100MeV and 1GeV, perturbative qcd, above ~5GeV. So, is there any method that works in good approximation bellow 100MeV, besides lattice methods? What about the interval between 1GeV and 5Gev? I read at ressonaances blog http://resonaances.blogspot.com/2011/11/lhcb-has-evidence-of-new-physics-maybe.html , 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?