Time dependent CP violation measurements at Belle II

Time dependent CP violation phenomena allow to precisely measure fundamental parameters of the Standard Model and search for New Physics. The Belle II experiment successfully completed the first phase of data tacking, collecting a sample of e+e− annihilations corresponding to an integrated luminosity of 362 fb−1 at the Υ(4S) resonance. In this report we present the latest measurement of time dependent CP violation in the golden channel B0 → J/ψK0 S. This study uses for the first time a new flavour tagging algorithm, based on graph-neural-network, which increases the effective tagging efficiency by 18% (relative) compared to the previous algorithm. Finally, we present the first Belle II measurement in the channel B0 →ηK0 S, which is dominated by the loop amplitude.