Updated Standard Model Prediction for ${\epsilon }^{\mathrm{\prime }}\mathrm{/}\epsilon$

A recent lattice evaluation of ${\epsilon }^{\mathrm{\prime }}\mathrm{/}\epsilon$, finding a 2.1 $\sigma$ deviation from the experimental value, has revived the old debate about a possible ${\epsilon }^{\mathrm{\prime }}\mathrm{/}\epsilon$ anomaly. The unfounded claims of a too low Standard Model prediction are based on incorrect estimates that neglect the long-distance re-scattering of the final pions in $K\to 2\pi$. In view of the current situation, we have recently updated the Standard Model calculation, including all known short- and long-distance contributions. Our result, $$\text{Re}$\left(\varepsilon’/\varepsilon\right) = (15 \pm 7)\cdot 10^{-4}$, is in complete agreement with the experimental measurement.