Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Event shape studies, \boldmath{$\alpha_s$} and its running from LEP   Data from electron positron annihilations at different center of mass
energies are collected by the four LEP experiments. Direct tests of hard QCD
are performed by measuring and analysing event shape observables.

14
The categories of this paper are: math-ph
36
The categories of this paper are: cmp-lg
17
The categories of this paper are: q-fin
7
The categories of this paper are: hep-th
23
The categories of this paper are: solv-int
18
The categories of this paper are: econ
16
The categories of this paper are: stat
37
The categories of this paper are: supr-con
3
The categories of this paper are: physics
20
The categories of this paper are: acc-phys
29
The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
33
The categories of this paper are: plasm-ph
15
The categories of this paper are: nucl-ex
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th