Abstract
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 + − π 0> electromagnetic mass difference and the weak K-decays confirms this expectation. Using this simple non-perturbative framework, we conclude that both the empirical ΔI = 1 2 rule and the recently measured ϵ′ ϵ are consistent with the standard model.
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