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Size of direct CP violation in singly Cabibbo-suppressed D decays · Around

2011

Size of direct CP violation in singly Cabibbo-suppressed D decays

Brod, Joachim, Kagan, Alexander L., Zupan, Jure

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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 -> K+ K- and D -> pi+ pi- time-integrated CP asymmetries.

We estimate the size of the effects that can be expected within the Standard Model and find that at leading order in 1/mc they are an order of magnitude smaller.
However, tree-level annihilation type amplitudes are known to be large experimentally.
This implies that certain formally 1/mc-suppressed penguin amplitudes could plausibly account for the LHCb measurement.

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