Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: (2+1)-Dimensional Yang-Mills Theory and Form Factor Perturbation Theory   We study Yang Mills theory in 2+1 dimensions, as an array of coupled
(1+1)-dimensional principal chiral sigma models. This can be understood as an
anisotropic limit where one of the space-time dimensions is discrete and the
others are continuous. The $SU(N)\times SU(N)$ principal chiral sigma model in
1+1 dimensions is integrable, asymptotically free and has massive excitations.
New exact form factors and correlation functions of the sigma model have
recently been found by the author and P. Orland. In this paper, we use these
new results to calculate physical quantities in (2+1)-dimensional Yang-Mills
theory, generalizing previous $SU(2)$ results by Orland, which include the
string tensions and the low-lying glueball spectrum. We also present a new
approach to calculate two-point correlation functions of operators using the
light glueball states. The anisotropy of the theory yields different
correlation functions for operators separated in the $x^1$ and
$x^2$-directions.

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The categories of this paper are: supr-con
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The categories of this paper are: adap-org
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The categories of this paper are: atom-ph
22
The categories of this paper are: chao-dyn
34
The categories of this paper are: chem-ph
12
The categories of this paper are: nucl-th
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
24
The categories of this paper are: dg-ga
10
The categories of this paper are: q-bio
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The categories of this paper are: eess
18
The categories of this paper are: econ
23
The categories of this paper are: solv-int
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The categories of this paper are: math
0
The categories of this paper are: hep-ph
31
The categories of this paper are: ao-sci