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We show that final state interactions (FSI) within a CPT invarianttwo-channel framework can enhance the charge-parity (CP) violation differencebetween $D^0\to\pi^-\pi^+$ and $D^0\to K^-K^+$ decays up to the currentexperimental value. This result relies upon: (i) the dominant tree leveldiagram, (ii) the well-known experimental values for the $D^ 0\to\pi^-\pi^+$and $D^ 0\to K^-K^+$ branching ratios, and (iii) the $\pi\pi \to \pi\pi$ and$\pi\pi \to K K $ scattering data to extract the strong phase difference andinelasticity. Based on well-grounded theoretical properties, we find the signand bulk value of the $\Delta A_{CP}$ and $A_{CP}(D^0 \to \pi^-\pi^+)$ recentlyobserved by the LHCb Collaboration.

Enhanced charm CP asymmetries from final state interactions