Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurements of $\alpha_s$ from event shapes and the four-jet rate   New results from measurements of the strong coupling constant $\alpha_s(M_Z)$
at LEP are presented. In particular, a new LEP combination of results based on
event-shape variables has become available, where a new method for the
estimation of the theoretical uncertainty has been implemented. Furthermore,
two other analyses are quoted, based on power corrections and the four-jet
rate.

22
The categories of this paper are: chao-dyn
25
The categories of this paper are: patt-sol
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
11
The categories of this paper are: hep-lat
28
The categories of this paper are: alg-geom
5
The categories of this paper are: gr-qc
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
37
The categories of this paper are: supr-con
13
The categories of this paper are: quant-ph
34
The categories of this paper are: chem-ph
7
The categories of this paper are: hep-th
0
The categories of this paper are: hep-ph
3
The categories of this paper are: physics
18
The categories of this paper are: econ