Measurement of $CP$ asymmetries in $B^0 rightarrow K^0_S K^0_S K^0_S$ decays at Belle II

Kavli Affiliate: T. Higuchi

| First 5 Authors: Belle II Collaboration, I. Adachi, L. Aggarwal, H. Ahmed, H. Aihara

| Summary:

We report a measurement of decay-time dependent charge-parity ($CP$)
asymmetries in $B^0 rightarrow K^0_S K^0_S K^0_S$ decays. We use $387 times
10^6 Bbar{B}$ pairs collected at the $Upsilon(4S)$ resonance with the Belle
II detector at the SuperKEKB asymmetric-energy electron-positron collider. We
reconstruct 220 signal events and extract the $CP$-violating parameters $S$ and
$C$ from a fit to the distribution of the decay-time difference between the two
$B$ mesons. The resulting confidence region is consistent with previous
measurements in $B^0 rightarrow K^0_S K^0_S K^0_S$ and $B^0 rightarrow
(cbar{c})K^0$ decays, and with predictions based on the standard model.

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