Kavli Affiliate: T. Higuchi
| First 5 Authors: Belle II Collaboration, F. Abudinén, I. Adachi, K. Adamczyk, L. Aggarwal
| Summary:
We report a measurement of decay-time dependent $CP$-violating parameters in
$B^0 rightarrow K^0_S K^0_S K^0_S$ decays. We use $(198.0 pm 3.0) times
10^6 Boverline{B}$ pairs collected at the $Upsilon(4S)$ resonance with the
Belle II detector at the SuperKEKB asymmetric-energy $e^+e^-$ collider. The
observed mixing-induced and direct $CP$ violation parameters are $mathcal{S} =
-1.86 _{-0.46}^{+0.91}~{rm (stat)} pm 0.09~{rm (syst)}$ and $mathcal{A} =
-0.22 _{-0.27}^{+0.30}~{rm (stat)} pm 0.04~{rm (syst)}$, respectively.
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