Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: $\tau$ mass and $R$ value measurements at BES   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.

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The categories of this paper are: plasm-ph
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The categories of this paper are: q-alg
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The categories of this paper are: patt-sol
5
The categories of this paper are: gr-qc
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The categories of this paper are: eess
20
The categories of this paper are: acc-phys
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The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
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The categories of this paper are: bayes-an
0
The categories of this paper are: hep-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: nlin
35
The categories of this paper are: mtrl-th
31
The categories of this paper are: ao-sci
24
The categories of this paper are: dg-ga
11
The categories of this paper are: hep-lat