Direct CP Violation in Nonleptonic Charm Decays

LHCb, CDF and most recently Belle have observed a large difference between direct CP asymmetries in $D^0\to K^+K^-$ and $D^0\toπ^+π^-$. We use the measured value of $ΔA_{CP}$ to constrain the magnitude and strong phase of a QCD-enhanced standard model penguin and predict its effects on direct CP asymmetry in $D^0\toπ^0π^0$ and $D^+\to K^+\bar{K}^0$.

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