Kaon physics from the RBC and UKQCD collaborations.
CP violation was discovered almost 50 years ago in kaon decays and although both direct and indirect CP violation are well established experimentally, there is still no robust theoretical prediction for the so-called parameters epsilon and epsilon’. I will report on our kaon physics program and in particular on the first realistic computation of a hadronic decay amplitude: A_2, the amplitude of K->(pi pi)_(I=2). I will also talk about the other isopsin, I=0. In the light of our these new results, I will show a new possible explanation of the Delta I=1/2 rule emerges. In the remainder of the presentation, I present our study of neutral kaon mixing beyond the standard model.