Kavli Affiliate: T. Higuchi
| First 5 Authors: , , , ,
| Summary:
We measure the time-integrated CP asymmetry in $D^0 rightarrow
K^0_SK^0_S$ decays reconstructed in $e^+e^- rightarrow
coverlinec$ events collected by the Belle and Belle II experiments. The
corresponding data samples have integrated luminosities of 980 fb$^-1$ and
428 fb$^-1$, respectively. The $D^0$ decays are required to originate from
the $D^*+ rightarrow D^0pi^+$ decay, which determines the charm flavor
at production time. A control sample of $D^0 rightarrow K^+K^-$ decays
is used to correct for production and detection asymmetries. The result,
$(-1.4pm1.3rm(stat)pm0.1rm (syst))%$, is consistent with previous
determinations and with CP symmetry.
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