Measurement of the Time-Integrated CP Asymmetry in D^0^0π^0 Decays at Belle II

We measure the time-integrated CP asymmetry, A_CP, in D^0^0π^0 decays reconstructed in e^+e^-→ cc̅ events collected by Belle II during 2019–2022. The data corresponds to an integrated luminosity of 428fb^-1. The D^0 decays are required to originate from the flavor-conserving D^*+→ D^0 π^+ decay to determine the charm flavor at production time. Control samples of D^0→ K^- π^+ decays, with or without an associated pion from a D^*+ decay, are used to correct for detection asymmetries. The result, A_CP(D^0^0π^0) = (0.30± 0.72± 0.20)%, where the first uncertainty is statistical and the second systematic, is consistent with CP symmetry.