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We present an updated analysis of isospin-violating corrections to$\varepsilon'/\varepsilon$ in the framework of chiral perturbation theory,taking advantage of the currently improved knowledge on quark masses andnonperturbative parameters. The role of the different ingredients entering intothe analysis is carefully assessed. Our final result is$\Omega_{\mathrm{eff}}=0.110\,{}^{+0.090}_{-0.088}$.

Isospin-breaking contributions to $\varepsilon'/\varepsilon$