V. Cirigliano, H. Gisbert, A. Pich, Antonio Rodriguez-Sánchez
A complete update of ε'/ε in the Standard Model


The recent release of improved lattice data has revived again the interest on precise theoretical calculations of the direct CP-violation ratio ε'/ε. We present a complete update of the Standard Model prediction [1,2], including a new re-analysis of isospin-breaking corrections which are of vital importance in the theoretical determination of this observable. The Standard Model prediction, Re(ε'/ε) = (14 ± 5)⋅10^−4, turns out to be in good agreement with the experimental measurement.

LU TP 19-52