Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Tau Decays and $\alpha_s$   The evolution of the determination of the strong coupling constant $\alpha_s$
from the leptonic branching ratios, the lifetime, and the invariant mass
distributions of the hadronic final state of the $\tau$ lepton over the last
two decades is briefly reviewed. The improvements in the latest ALEPH update
are described in some detail. Currently this is one of the most precise
$\alpha_s$ determinations. Together with the other determination at the $Z$
boson mass pole, they constitutes the most accurate test of the asymptotic
freedom in QCD.

16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
24
The categories of this paper are: dg-ga
18
The categories of this paper are: econ
20
The categories of this paper are: acc-phys
27
The categories of this paper are: comp-gas
29
The categories of this paper are: funct-an
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
34
The categories of this paper are: chem-ph
32
The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
1
The categories of this paper are: cs
13
The categories of this paper are: quant-ph
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex