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A consistent picture for large penguins in D -> pi+ pi-, K+ K- · Around

2012

A consistent picture for large penguins in D -> pi+ pi-, K+ K-

Brod, Joachim, Grossman, Yuval, Kagan, Alexander L. et al.

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A long-standing puzzle in charm physics is the large difference between the D0 -> K+ K- and D0 -> pi+ pi- decay rates.

Recently, the LHCb and CDF collaborations reported a surprisingly large difference between the direct CP asymmetries, Delta A_CP, in these two modes.
We show that the two puzzles are naturally related in the Standard Model via s- and d-quark "penguin contractions".
Their sum gives rise to Delta A_CP, while their difference contributes to the two branching ratios with opposite sign.

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