Chiral loop corrections and isospin violation effects in epsilon'/epsilon

Abstract

A complete analysis of isospin breaking in $K\to 2π$ amplitudes, including both strong and electromagnetic corrections at next-to-leading order in chiral perturbation theory, has been achieved recently. We discuss the implication of these effects, together with the previously known chiral loop corrections, on the direct CP-violating ratio epsilon'/epsilon.

6 pages. Proc. 10th International QCD Conference (QCD 03), Montpellier, France, 2-9 July 2003. Nucl. Phys. B (Proc. Suppl.) (2004) in press