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| As Contributors: | Jianyong Zhang |
| Arxiv Link: | https://arxiv.org/abs/1812.10056v1 |
| Date accepted: | 2019-01-17 |
| Date submitted: | 2018-12-27 |
| Submitted by: | Zhang, Jianyong |
| Submitted to: | SciPost Physics Proceedings |
| Domain(s): | Experimental |
| Subject area: | High-Energy Physics - Experiment |
In order to obtain the mass of $\tau$ lepton at BESIII precisely, a beam energy measurement system was built at BEPCII. A scenario for high precision $\tau$ mass measurement was put forth before data taken. More than 130 $pb^{-1}$ $\tau$ mass scan data were collected in April 2018, and the uncertainty of $m_{\tau}$ is expected to be less than 100 keV.