Electroweak interactions of hadrons

Constraints on physics beyond the standard model require a preliminary understanding of the interplay between the electroweak and strong interactions. Strong interaction effects are in principle non-negligible below the confining scale. A complementary approach, based on the meson-quark duality and applied on the π+-π0 electromagnetic mass difference and the weak K-decays, confirms this expectation. Using this simple non-perturbative framework, I conclude that the KL-KS mass difference, the empirical ΔI= 1/2 rule and the recently measured ε'/ε are consistent with the standard model. (author)