Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: S-matrix and productions amplitudes in high energy QCD   In this note we discuss a generalization of the Lipatov's effective action
approach, \cite{LipatovEff,LipatovEff1}, for the case of description of gluon
and quark production amplitudes in the quasi-multi-Regge kinematics. Following
to \cite{Faddeev}, we define the S-matrix elements of high energy QCD processes
in this kinematics and discuss applications of the obtained results.

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The categories of this paper are: eess
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The categories of this paper are: adap-org
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The categories of this paper are: stat
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The categories of this paper are: physics
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The categories of this paper are: acc-phys
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The categories of this paper are: ao-sci
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The categories of this paper are: quant-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: supr-con
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The categories of this paper are: cmp-lg
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The categories of this paper are: dg-ga
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The categories of this paper are: cond-mat
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The categories of this paper are: bayes-an
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The categories of this paper are: comp-gas
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The categories of this paper are: patt-sol
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The categories of this paper are: econ