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

### Submission summary

 As Contributors: Michel Enrique Hernandez Villanueva Preprint link: scipost_201811_00003v2 Date accepted: 2019-01-17 Date submitted: 2018-12-11 Submitted by: Hernandez Villanueva, Michel Enrique Submitted to: SciPost Physics Proceedings Proceedings issue: The 15th International Workshop on Tau Lepton Physics (Amsterdam, 2018-09) Domain(s): Experimental Subject area: High-Energy Physics - Experiment

### 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, a factor of 50 more than the Belle experiment. 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 (LFV and LNV), 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.

###### Current status:

I appreciate the changes suggested by the referee. They have been implemented, and additional minor style-changes in the text have been done.

### List of changes

1. "(LFV and LNV)" have been removed from the abstract.
2. On page2, "cm^-2 s^-2" has been replaced to "cm^2 s^-1".
3. In fig.5, the caption has been fixed: "obtained for previous"->"obtained from previous".
4. At references, a blank space has been added between the journal and the volume.
5. Section 4.3, fixing a typo: "especial" -> "special".