$\tau$ mass and $R$ value measurements at BES

TL;DR

This paper reviews the measurements of the tau lepton mass and R values between 2 and 5 GeV at BES, discussing their implications for the Standard Model and future prospects at BESIII.

Contribution

It provides a comprehensive overview of tau mass and R value measurements at BES and discusses future improvements at BESIII.

Findings

Updated tau mass and R value measurements

Implications for Standard Model tests

Future prospects at BESIII

Abstract

A comprehensive review of the measurements of $\tau$ lepton mass and $R$ values in the energy region between $2-5$ GeV, achieved at the BES experiment, is presented. In addition to the evaluation of their impact on the test of Standard Model, we also highlighted the present status and the most recent developments. In particular, we made an extensive discussion on the prospects for future improvements at the BESIII experiment.