Direct CP violation in charm at Belle

Abstract

Using the full data sample collected with the Belle detector at the KEKB asymmetric-energy $e^{+}{e}^{-}$ collider, we have searched for CP violation of charmed mesons in $D^{+}\to K_S^0{\pi }^{+}$ and $D^0\to h^{+}{h}^{-}$ decays, where $h$ denotes $K$ and $\pi$. We observe evidence for CP violation in $D^{+}\to K_S^0{\pi }^{+}$ decay with 3.2 standard deviations away from zero, $(-0.363\pm 0.094\pm 0.067)$, while the asymmetry is consistent with the expected CP violation due to the neutral kaon in the final state. No evidence for CP violation in $D^0\to h^{+}{h}^{-}$ is observed with $A_{CP}^{KK}=(-0.32\pm 0.21\pm 0.09)$ and $A_{CP}^{\pi \pi }=(+0.55\pm 0.36\pm 0.09)$. The CP asymmetry difference between $D^0\to K^{+}{K}^{-}$ and $D^0\to {\pi }^{+}{\pi }^{-}$ decays is also measured with $\Delta A_{CP}^{hh}=(-0.87\pm 0.41\pm 0.06)$, which is 2.1 standard deviations away from zero and supports recent LHCb and CDF measurements.

Proceedings of the 36th International Conference on High Energy Physics - ICHEP 2012; July 4-11 2012; Melbourne, Australia

Cited by in corpus (9)

• Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays
• Modified Higgs Physics from Composite Light Flavors
• Search for direct CP violation in D0 -> h- h+ modes using semileptonic B decays
• Sum Rules of Charm CP Asymmetries beyond the SU(3)${}_F$ Limit
• Shift in weak phase $\gamma$ due to CP asymmetries in $D$ decays to two pseudoscalar mesons
• Nonuniversality of indirect CP asymmetries in $D\to \pi \pi ,KK$ decays
• SU(3)F in nonleptonic charm decays
• Theoretical Issues in Flavor Physics
• CKM studies in the charm sector