Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of alpha_s from hadronic event shapes in e+e- annihilation   New studies of hadronic event shape observables in e+ e- collisions between
13 and 183 GeV CM energy have enabled the running of alpha_s to be confirmed
and the validity of non-perturbative power-law corrections to be investigated.
A more precise value of alpha_s(M_Z) with reduced theoretical errors has been
reported from fitting 18 oriented event shape distributions measured in one
experiment at the Z.

33
The categories of this paper are: plasm-ph
12
The categories of this paper are: nucl-th
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
20
The categories of this paper are: acc-phys
31
The categories of this paper are: ao-sci
27
The categories of this paper are: comp-gas
2
The categories of this paper are: math
6
The categories of this paper are: astro-ph
32
The categories of this paper are: atom-ph
14
The categories of this paper are: math-ph
11
The categories of this paper are: hep-lat
3
The categories of this paper are: physics
1
The categories of this paper are: cs
9
The categories of this paper are: nlin