QCD-based estimate of direct $CP$ asymmetry in charm decays

Abstract

I discuss the calculation of the direct CP-asymmetry in $D\to {\pi }^{+}{\pi }^{-}$ and $D\to K^{+}{K}^{-}$ decays with the method of QCD light-cone sum rules. The main result is the upper limit for the difference of the two asymmetries $\left|\Delta a_{CP}^{dir}\right|<0.020\pm 0.003\%$ which is significantly smaller than the recent measurement of this quantity by the LHCb collaboration

Comments: Contribution to the Proceedings of 10th International Workshop on Charm Physics (CHARM2020)