Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Power Corrections at LEP   The size of non-perturbative corrections to event shape observables is
predicted to fall like powers of the inverse centre of mass energy. These power
corrections are investigated for different observables from
$e^+e^-$-annihilation measured at LEP as well as previous experiments. The
obtained corrections are compared to other approaches and theoretical
predictions. Measurements of $\alpha_s$ using power corrections are compared to
conventional methods.

17
The categories of this paper are: q-fin
32
The categories of this paper are: atom-ph
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
6
The categories of this paper are: astro-ph
3
The categories of this paper are: physics
12
The categories of this paper are: nucl-th
14
The categories of this paper are: math-ph
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
8
The categories of this paper are: hep-ex
4
The categories of this paper are: cond-mat
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
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The categories of this paper are: adap-org
25
The categories of this paper are: patt-sol