What did we learn in theory from the $ΔA_{CP}$-saga?

The measurement of CP violation in the charm sector triggered a lot of theoretical activities and re-considerations. Nevertheless currently neither theory nor experiment have reached definite conclusions about the origin of a large CP violating effect in hadronic $D$ decays. We review briefly (part of) the current theory literature and present as the most important outcome of the many investigations initial steps in a long journey to understand the standard model contribution to hadronic $D$ meson decays from first principles as well as various control channels, that can be studied by experiment.

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