A consistent picture for large penguins in D →π+π−, K+K−

By J. Brod, Y. Grossman, A. Kagan, Jure Zupan. 2012

138 citations recorded by the source corpus.

A bstractA long-standing puzzle in charm physics is the large difference between the D0 → K+K− and D0 → π+π− decay rates. Recently, the LHCb and CDF collaborations reported a surprisingly large difference between the direct CP asymmetries, ΔACP, 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 ΔACP, while their difference contributes to the two branching ratios with opposite sign. Assuming nominal SU(3) breaking, we perform a U-spin based fit to the D0 → K+π−, π+K− , π+π− , K+K− decay rates, which yields large penguin contractions that naturally explain ΔACP. Expectations for the individual CP asymmetries are also discussed.

Subfields: Nuclear and High Energy Physics

View Paper: https://www.semanticscholar.org/paper/1cf41f06298e325d089fe843c3902124bc0649a7

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In Nuclear and High Energy Physics

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Implications of LHCb measurements and future prospects - eScholarship (2013, background): “A(D0→ K−π+), can be interpreted as suggesting that U-spin is a good symmetry in these decays [453].”