Direct CP violation in singly Cabibbo-suppressed D-meson decays
Abstract
The LHCb and CDF collaborations reported a surprisingly large difference between the direct CP asymmetries, Delta ACP, in the D0 -> K+ K- and D0 -> pi+ pi- decay modes. We show that this measurement can be plausibly explained within the standard model under the assumption of large penguin contractions matrix elements and nominal U-spin breaking. A consistent picture arises, accommodating the large difference between the decay rates, and the measured decay rates of the D -> K pi modes.
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