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Epsilon'/Epsilon in the Standard Model: Theoretical Update

A. Pich

hep-pharXiv:hep-ph/0410215

Abstract

A complete analysis of isospin breaking in K to 2 pion 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. One finds Re(epsilon'/epsilon) = (19+11-9) 10-4.

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