PHYS. REV. D 109, 112020 (2024)

SCIE

Measurement of CP asymmetries in B^0 → K_0^SK_0^SK_0 ^S decays at Belle II

Belle II Collaboration (I. Adachi, ..., N. Anh Ky, ...)

We report a measurement of decay-time dependent charge-parity (CP) asymmetries in B 0 → K0 SK0 SK0 S decays. We use 387 × 106 BB pairs collected at the Υ(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 → K0 SK0 SK0 S and B 0 → (cc)K0 decays, and with predictions based on the standard model.

DOI: https://doi.org/10.1103/PhysRevD.109.112020

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