Laura Zani

03 July 2023

Abstract: Tau leptons offer a very clean environment to study the process of hadronization and are powerful tools to probe physics beyond the Standard Model (SM), which might be enhanced due to mass-dependent couplings. The Belle II experiment, installed at SuperKEKB asymmetric energy electron-positron collider, will collect the world’s largest sample of tau pair events 𝑒+𝑒− → 𝜏+𝜏− . Direct searches for new invisible mediators, charged lepton flavor violation in 𝜏 decays, and tests of the SM via precision measurements of 𝜏 lepton properties and couplings are reported in the following article. The results presented here rely on the data collected by Belle II during 2019-2021.