On the size of direct CP violation in singly Cabibbo-suppressed D decays

Details On the size of direct CP violation in singly Cabibbo-suppressed D decays On the size of direct CP violation in singly Cabibbo-suppressed D decays

2011-11-21

arxiv.org/abs/1111.5000v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

5 pages, 4 figures. Added acknowledgements. Improved discussion of other modes, and constraints on penguin contractions

Scientific paper

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/m_c 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/m_c suppressed penguin amplitudes could plausibly account for the LHCb measurement.

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