The Event Timing Finder for the Central Drift Chamber Level-1 Trigger at the Belle II experiment

The level-1 trigger system of the Belle II experiment is designed to select physics events interest with almost 100% efficiency for hadronic events. In terms event timing decision, required have an accuracy less than 10 ns. Central Drift Chamber (CDC) provides information as one sources. We developed new algorithm measure about ns based on CDC hit timing. Two-dimensional charged track reconstruction by Hough transformation was utilized reduce high background hits. used a new-developed general-purpose FPGA board (Universal Trigger 4) this module first time. report performance using e + − collision data collected in 2020.