Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Study of Multiphoton Final States and Tests of QED in e+e- collisions at
  \root(s) up to 209 GeV   The process e+ e- -> n gamma with n>=2 is studied at centre-of-mass energies
ranging from \root(s)=192 to 208 GeV. The data sample corresponds to a total
integrated luminosity of 427 1/pb. The total and differential cross sections
are found to be in agreement with the QED expectations. Using all the data
collected with the L3 detector above the Z pole, limits on deviations from QED,
excited electrons, contact interactions, extra space dimensions and excited
spin-3/2 leptons are set.

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The categories of this paper are: hep-ph
17
The categories of this paper are: q-fin
36
The categories of this paper are: cmp-lg
29
The categories of this paper are: funct-an
37
The categories of this paper are: supr-con
21
The categories of this paper are: adap-org
5
The categories of this paper are: gr-qc
24
The categories of this paper are: dg-ga
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
32
The categories of this paper are: atom-ph
18
The categories of this paper are: econ
1
The categories of this paper are: cs
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg