Measurement of ? (?<inf>3</inf>) and first results on CP violation at Belle II

Flavor physics measurements at high luminosity B-factories offer a good probe for testing the Standard Model and looking for New Physics. With the first successful e+e- collisions recorded in 2018, the Belle II experiment is accumulating its first physics data. The design peak instantaneous luminosity of the SuperKEKB accelerator is 6 × 1035 cm-2s-1. The size of the targeted data set is 50 ab-1, which will significantly improve the experimental precision on the three angles of the CKM unitarity triangle measured by the first generation of B factories.. These measurements are based on time-dependent CP asymmetry analyses for the angles ?1 and ?2, and on the measurement of direct CP violation in the decay channel B- ? DK- for ?3. In this proceeding, we report the prospects for determining ?3. In addition, we describe the first calibration and performance of the Belle II flavor tagging algorithm. Finally, we present the first time-dependant CP violation measurement using the channel (equation presented)with the 34.6 fb-1 data set recorded by Belle II so far, which results in the measurement of sin 2?1 of 0.55 ± 0.21 ± 0.04 where the first and second uncertainties are statistical and systematic, respectively.