Energy Scale Fields Effective

Rare K decays are an important testing ground of the electroweak flavour theory. They can provide new signals of CP–violation phenomena and, perhaps, a window into physics beyond the Standard Model. The interplay of long–distance QCD effects in strangeness–changing transitions can be analyzed with Chiral Perturbation Theory techniques. Some theoretical predictions obtained within this framework for radiative kaon decays are reviewed, together with the present experimental status.