V. Cirigliano, H. Gisbert, A. Pich, Antonio Rodriguez-Sánchez
Theoretical status of ε'/ε


We briefly overview the historical controversy around Standard Model predictions of ε'/ε and clarify the underlying physics. A full update of this important observable is presented, with all known short- and long-distance contributions, including isospin-breaking corrections. The current Standard Model prediction, Re(ε'/ε)=(14±5)⋅10^−4, is in excellent agreement with the experimentally measured value.

LU TP 19-55