Search for CP Violation and Measurement of the Branching Fraction in the Decay D0→KS0KS0
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We report a measurement of decay-time-dependent charge-parity ( ) asymmetries in decays. We use pairs collected at the resonance with the Belle II detector at the SuperKEKB asymmetric-energy electron-positron collider. We reconstruct 220 signal events and extract the -violating parameters and from a fit to the distribution of the decay-time difference between the two mesons. The resulting confidence region is consistent with previous measurements in and decays and with predictions based on the standard model. Published by the American Physical Society2024more » « less