Studies on $\tau$ decays at Belle II

TL;DR

This paper reports on Belle II's analysis of tau lepton decays, aiming to discover new physics beyond the Standard Model through various searches and precision measurements using data from 2019-2021.

Contribution

It presents the first results from Belle II on tau decays, including searches for new mediators and lepton flavor violation, and precision tests of the Standard Model.

Findings

Search for invisible mediators conducted

Limits set on charged lepton flavor violation

Precision measurements of tau properties

Abstract

Tau leptons are powerful tools to probe physics beyond the Standard Model (SM). The Belle II experiment is installed at the SuperKEKB asymmetric energy electron-positron collider and aims at collecting the world's largest sample of tau pair events $e^{+}e^{-}\rightarrow \tau^+ \tau^-$. Direct searches for new invisible mediators, charged lepton flavor violation in $\tau$ decays, and tests of the SM via precision measurements of $\tau$ lepton properties and couplings are reported in the following article. The results presented here are based on the data collected by Belle II during 2019-2021.