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Implications of the LHCb discovery of CP violation in charm decays
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abstract
The recent measurement of $\Delta A_{CP}$ by the LHCb collaboration requires an ${\cal O}(10)$ enhancement coming from hadronic physics in order to be explained within the SM. We examine to what extent can NP models explain $\Delta A_{CP}$ without such enhancements. We discuss the implications in terms of a low energy effective theory as well as in the context of several explicit NP models.
Forward citations
Cited by 3 Pith papers
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Search for $CP$ violation in $\Xi_c^+\to\Sigma^+h^+h^-$ and $\Lambda_c^+\to ph^+h^-$ at Belle II
First individual A_CP measurements for Xi_c+ -> Sigma+ h+h- and Lambda_c+ -> p h+h- decays, all consistent with CP symmetry and with U-spin sum-rule predictions.
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Measurement of the CP asymmetry in $D^+ \to \pi^+ \pi^0$ decays at Belle II
The new world-best measurement of the CP asymmetry in D+ -> pi+ pi0 decays is (-1.8 +/- 0.9 +/- 0.1)%, consistent with zero and with the Standard Model.
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Measurement of the time-integrated $CP$ asymmetry in $D^0\to\pi^0\pi^0$ decays at Belle II
Belle II measures A_CP(D0 -> pi0 pi0) = (0.30 ± 0.72 ± 0.20)%, consistent with no CP violation and with the previous Belle measurement.
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