Search for CP Violation in the Decays $D^0\rightarrow K^0_S P^0$

Abstract

We have searched for CP violation in the decays $D^0\rightarrow K^0_S P^0$ where $P^0$ denotes a neutral pseudo-scalar meson which is either a $π^0$, $η$, or $η'$ using KEKB asymmetric-energy $e^+e^-$ collision data corresponding to an integrated luminosity of 791 fb$^{-1}$ collected with the Belle detector. No evidence of significant CP violation is observed. We report the most precise CP asymmetry measurement in the decay $D^0\rightarrow K^0_Sπ^0$ to date: $A_{CP}^{D^0\rightarrow K^0_Sπ^0}=(-0.28\pm0.19\pm0.10)%$. We also report the first measurements of CP asymmetries in the decays $D^0\rightarrow K^0_Sη$ and $D^0\rightarrow K^0_Sη'$: $A_{CP}^{D^0\rightarrow K^0_Sη}=(+0.54\pm0.51\pm0.16)%$ and $A_{CP}^{D^0\rightarrow K^0_Sη'}=(+0.98\pm0.67\pm0.14)%$, respectively.