Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Top Quark Production and Decay at Next-to-leading Order in $e^+e^-$
  Annihilation   We study the effects of QCD corrections to the process $e^+e^-\rightarrow
t\bar t+X\rightarrow b\ell^+\nu \bar b\ell^-\bar \nu+X$ above threshold. We
show how to treat consistently to ${\cal O}(\alpha_s)$ the gluon radiation in
both the production and the decay of the top quarks, while maintaining all
angular correlations in the event. At this order there is an ambiguity in the
event reconstruction whenever a real gluon occurs in the final state. We study
the effects of this ambiguity on the top mass and helicity angle distributions.
For a top mass of 175 GeV and collider energy of 400 GeV the gluon radiation is
emitted predominantly in the decay of the top quarks.

14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
8
The categories of this paper are: hep-ex
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
33
The categories of this paper are: plasm-ph
6
The categories of this paper are: astro-ph
1
The categories of this paper are: cs
30
The categories of this paper are: q-alg
4
The categories of this paper are: cond-mat
28
The categories of this paper are: alg-geom
34
The categories of this paper are: chem-ph
21
The categories of this paper are: adap-org
3
The categories of this paper are: physics
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The categories of this paper are: patt-sol
26
The categories of this paper are: bayes-an