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Final state interactions in $$K\rightarrow \pi \pi $$ K → π π decays: $$\Delta I=1/2$$ Δ I = 1 / 2 rule vs. $$\varepsilon '/\varepsilon $$ ε ′ / ε
Dispersive effects from strong $$\pi \pi $$ rescattering in the final state interaction (FSI) of weak $$K\rightarrow \pi \pi $$ decays are revisited with the goal to have a global view on their relative importance for the $$\Delta I=1/2$$ rule and the ratio $$\varepsilon '/\varepsilon $$ in the standard model …