$CP$ asymmetries in charm decays into neutral kaons

Abstract

We find a new $CP$-violation effect in charm decays into neutral kaons, which results from the interference between two tree (Cabibbo-favored and doubly Cabibbo-suppressed) amplitudes with the mixing of final-state mesons. This effect, estimated to be of an order of $10^{-3}$, is much larger than the direct $CP$ asymmetries in these decays, but missed in the literature. It can be revealed by measuring the difference of the time-dependent $CP$ asymmetries in the $D^{+}\to {\pi }^{+}{K}_S^0$ and $D_s^{+}\to K^{+}{K}_S^0$ modes, which are accessible at the LHCb and Belle II experiments. If confirmed, the new effect has to be taken into account, as the above direct $CP$ asymmetries are used to search for new physics.

5 pages, 4 figures; Accepted by Physical Review Letters

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Cited by in corpus (10)

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• Search for $CP$ violation in $D_s^{+}\to K_S^0{\pi }^{+}$, $D^{+}\to K_S^0{K}^{+}$ and $D^{+}\to \varphi {\pi }^{+}$ decays
• Charm Physics at the Super $\tau$-Charm Factory
• Recent advances in charm mixing and $CP$ violation at LHCb
• Pure annihilation decays of $B_s^0\to a_0^{+}{a}_0^{-}$ and $B_d^0\to K_0^{\ast +}{K}_0^{\ast -}$ in the PQCD approach
• Study of CP Violation in $D^{\pm }\to K^{\ast }(892{)}^0{\pi }^{\pm }+{\bar{K}}^{\ast }(892{)}^0{\pi }^{\pm }\to K_{S,L}^0{\pi }^0{\pi }^{\pm }$ Decays
• Search for CP violation in $e^{+}{e}^{-}\to \psi (3770)\to D^0{\bar{D}}^0$ via $D->K_S^0{\pi }^0$
• $CP$ violation in charmed hadron decays into neutral kaons