Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara
| Summary:
We measure the CP asymmetry in $D^+ to pi^+ pi^0$ decays reconstructed in
$e^+ e^-$ collisions at the Belle II experiment using a data set corresponding
to an integrated luminosity of 428 fb$^{-1}$. A control sample of $D^+ to
pi^+ K_{S}$ decays is used to correct for detection and production
asymmetries. The result, $A_{CP}(D^+ to pi^+pi^0) =(-1.8 pm 0.9 pm
0.1)%$, where the first uncertainty is statistical and the second systematic,
is the most precise determination to date. It agrees with the prediction of CP
symmetry from the standard model, and with results of previous measurements.
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