Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, Belle II Collaboration, , ,
| Summary:
We measure the time- and phase-space-integrated $CP$ asymmetry $A_CP$ in
$D^0topi^+pi^-pi^0$ decays reconstructed in $e^+e^-to cbar c$ events
collected by the Belle II experiment from 2019 to 2022. This sample corresponds
to an integrated luminosity of 428 fb$^-1$. We require $D^0$ mesons to be
produced in $D^*+to D^0pi^+$ decays to determine their flavor at
production. Control samples of $D^0to K^-pi^+$ decays are used to correct for
reconstruction-induced asymmetries. The result,
$A_CP(D^0topi^+pi^-pi^0)=(0.29pm0.27pm0.13)%$, where the first
uncertainty is statistical and the second systematic, is the most precise
result to date and is consistent with $CP$ conservation.
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