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Size of direct<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>C</mml:mi><mml:mi>P</mml:mi></mml:math>violation in singly Cabibbo-suppressed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>D</mml:mi></mml:math>decays
The first experimental evidence for direct $CP$ violation in charm-quark decays has recently been presented by the LHCb collaboration in the difference between the $D\ensuremath{\rightarrow}{K}^{+}{K}^{\ensuremath{-}}$ and $D\ensuremath{\rightarrow}{\ensuremath{\pi}}^{+}{\ensuremath{\pi}}^{\ensuremath{-}}$ time-integrated $CP$ asymmetries. We estimate the size of the effects that can be expected within the Standard Model and find that at leading …