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Title: Measurement of the single-spin asymmetry Ay0 in quasi-elastic 3He↑(e,e′n) scattering at 0.4 < Q2 < 1.0 GeV/c2
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  1. We report a measurement of decay-time-dependent charge-parity ( C P ) asymmetries in B 0 K S 0 K S 0 K S 0 decays. We use 387 × 10 6 B B ¯ pairs collected at the ϒ ( 4 S ) resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the C P -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 K S 0 K S 0 K S 0 and B 0 ( c c ¯ ) K 0 decays and with predictions based on the standard model. Published by the American Physical Society2024 
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