We search for $CP$ violation in the charged charm meson decay $D^{+}\to {\pi }^{+}{\pi }^0$, based on a data sample corresponding to an integrated luminosity of $921{\mathrm{fb}}^{-1}$ collected by the Belle experiment at the KEKB $e^{+}{e}^{-}$ asymmetric-energy collider. The measured $CP$-violating asymmetry is $[+2.31\pm 1.24(\mathrm{stat})\pm 0.23(\mathrm{syst})]\%$, which is consistent with the standard model prediction and has a significantly improved precision compared to previous results.

• Received 5 December 2017

DOI:https://doi.org/10.1103/PhysRevD.97.011101

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Published by the American Physical Society