Nonleptonic $K\to 2\pi$ decay dynamics

Abstract

Using Chiral Perturbation Theory to properly account for the dynamics of nonleptonic $K\to 2\pi$ decays, we found the Standard Model prediction for the CP violating ratio $\text{mbox}Re\left({\epsilon }^{\prime }/\epsilon \right)=\left(14\pm 5\right)\times 10^{-4}$, where isospin breaking effects are included, in perfect agreement with the current experimental world average. Similar results have been reported by a recent release of improved lattice data.

Comments: 5 pages. Talk given at 23th International Conference in Quantum Chromodynamics (QCD 20), 27 - 30 October 2020, Montpellier - FR