Kavli Affiliate: T. Higuchi
| First 5 Authors: , , , ,
| Summary:
We measure the time-integrated $CP$ asymmetry, $A_CP$, in
$D^0topi^0pi^0$ decays reconstructed in $e^+e^-to cbarc$ events
collected by Belle II during 2019–2022. The data corresponds to an integrated
luminosity of 428$mathrmfb^-1$. The $D^0$ decays are required to originate
from the flavor-conserving $D^*+ to D^0 pi^+$ decay to determine the charm
flavor at production time. Control samples of $D^0to K^- pi^+$ decays, with
or without an associated pion from a $D^*+$ decay, are used to correct for
detection asymmetries. The result, $A_CP(D^0topi^0pi^0) = (0.30pm 0.72pm
0.20)%$, where the first uncertainty is statistical and the second systematic,
is consistent with $CP$ symmetry.
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