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

Abstract

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. Simultaneously, the flavor-breaking parts of these amplitudes could explain the large difference between the D -> K+ K- and D -> pi+ pi- decay rates.

5 pages, 2 figures. Corrected numerical error; our estimated range for Delta A_CP is reduced by a factor of two

References in corpus (7)

• New Physics and CP Violation in Singly Cabibbo Suppressed D Decays
• Implications of the LHCb Evidence for Charm CP Violation
• CP asymmetries in singly-Cabibbo-suppressed $D$ decays to two pseudoscalar mesons
• Direct CP violation in charm and flavor mixing beyond the SM
• New Physics Models of Direct CP Violation in Charm Decays
• CP violation in $D^0\to (K^{-}{K}^{+},{\pi }^{-}{\pi }^{+})$ from diquarks
• Can Up FCNC solve the $\Delta A_{CP}$ puzzle?

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