# Prospects for $\tau$ lepton physics at Belle II

## TL;DR

The Belle II experiment, an upgraded detector at SuperKEKB, aims to perform precision measurements and searches related to tau leptons, leveraging high luminosity and large data samples to explore Standard Model parameters and potential new physics.

## Contribution

This paper reviews the tau lepton physics program at Belle II, highlighting its potential for precision measurements and new physics searches in the context of the upgraded collider.

## Key findings

- Successful commissioning of Belle II and initial collisions observed in 2018.
- Design luminosity of SuperKEKB enables extensive tau physics studies.
- Projected large data sample of 50 ab$^{-1}$ for detailed analyses.

## Abstract

The Belle II experiment is an upgrade of the Belle detector and will operate at the SuperKEKB energy-asymmetric $e^+e^-$ collider. The accelerator has already successfully completed the first phase of commissioning and first electron positron-collisions in Belle II were observed in April 2018. The design luminosity of SuperKEKB is 8x10$^{35}$ cm$^{-2}$s$^{-1}$ and the Belle II experiment aims to record 50 ab$^{-1}$ of data. Belle II has a broad program of $\tau$ physics, in particular, precision measurements of Standard Model parameters and searches of lepton flavor and lepton number violations, benefiting from the large cross-section of the pairwise $\tau$ lepton production in $e^+e^-$ collisions. In this talk, we will review the $\tau$ lepton physics program of Belle II.