Direct CP violation in D-meson decays

Abstract

Recently, the LHCb and CDF collaborations reported a surprisingly large difference between the direct CP asymmetries, Delta A_CP, in the D0 -> K+ K- and D0 -> pi+ pi- decay modes. An interesting question is whether this measurement can be explained within the standard model. In this review, I would like to convey two messages: First, large penguin contractions can plausibly account for this measurement and lead to a consistent picture, also explaining the difference between the decay rates of the two modes. Second, "new physics" contributions are by no means excluded; viable models exist and can possibly be tested.

4 pages, 1 figure. To appear in the proceedings of the 47th Rencontres de Moriond on QCD and High-Energy Interactions, 2012

References in corpus (8)

• Evidence for CP violation in time-integrated D0 -> h-h+ decay rates
• Size of direct CP violation in singly Cabibbo-suppressed D decays
• Direct CP violation in two-body hadronic charmed meson decays
• CP Violation and Flavor SU(3) Breaking in D-meson Decays
• A consistent picture for large penguins in D -> pi+ pi-, K+ K-
• CP asymmetries in singly-Cabibbo-suppressed $D$ decays to two pseudoscalar mesons
• Testing for new physics in singly Cabibbo suppressed D decays
• Relating direct CP violation in D decays and the forward-backward asymmetry in $t\bar{t}$ production