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We measure the time-dependent CPviolation parameters in B0 → K0 S K0 S K0 S decays using 772 × 106 BB̅ pairs collected at the ϒ(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e collider. The obtained mixing-induced and direct CP asymmetries are −0.71 ± 0.23 (stat) ± 0.05 (syst) and 0.12 ± 0.16 (stat) ± 0.05 (syst), respectively. These values are consistent with the Standard Model predictions. The significance of CP violation differs from zero by 2.5 standard deviations.

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Kang, K. H., Park, H., Higuchi, T., Miyabayashi, K., Sumisawa, K., Adachi, I., Ahn, J. K., Aihara, H., Al Said, S., Asner, D. M., Aulchenko, V., Aushev, T., Ayad, R., Babu, V., Bahinipati, S., Bakich, A. M., Behera, P., Beleño, C., Bennett, J., … Zhulanov, V. (2021). Measurement of Time-Dependent CP Violation Parameters in B0 → K0 S K0 S K0 S Decays at Belle. Physical Review D, 103(3).

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