Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Measurement of Bose-Einstein Correlations in e+e- -> W+W- Events at LEP   Bose-Einstein correlations in W-pair production at LEP are investigated in a
data sample of 629 pb^-1 collected by the L3 detector at centre-of-mass
energies of 189-209 GeV. Bose-Einstein correlations between pions within a W
decay are observed and found to be in good agreement with those in light-quark
Z decay. No evidence is found for Bose-Einstein correlations between hadrons
coming from different W's in the same event.

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The categories of this paper are: cmp-lg
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The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
9
The categories of this paper are: nlin
11
The categories of this paper are: hep-lat
25
The categories of this paper are: patt-sol
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The categories of this paper are: eess
28
The categories of this paper are: alg-geom
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The categories of this paper are: q-fin
3
The categories of this paper are: physics
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The categories of this paper are: dg-ga
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The categories of this paper are: q-alg
29
The categories of this paper are: funct-an
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The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
33
The categories of this paper are: plasm-ph