Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Construction and clustering properties of the 2-d non-linear sigma-model
  form factors: O(3), O(4), large n examples   Multi-particle form factors of local operators in integrable models in two
dimensions seem to have the property that they factorize when one subset of the
particles in the external states are boosted by a large rapidity with respect
to the others. This remarkable property, which goes under the name of form
factor clustering, was first observed by Smirnov in the O(3) non-linear
sigma-model and has subsequently found useful applications in integrable models
without internal symmetry structure. In this paper we conjecture the nature of
form factor clustering for the general O(n) sigma-model and make some tests in
leading orders of the 1/n expansion and for the special cases n=3,4.

26
The categories of this paper are: bayes-an
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The categories of this paper are: acc-phys
14
The categories of this paper are: math-ph
35
The categories of this paper are: mtrl-th
34
The categories of this paper are: chem-ph
31
The categories of this paper are: ao-sci
37
The categories of this paper are: supr-con
1
The categories of this paper are: cs
21
The categories of this paper are: adap-org
9
The categories of this paper are: nlin
15
The categories of this paper are: nucl-ex
10
The categories of this paper are: q-bio
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
2
The categories of this paper are: math
29
The categories of this paper are: funct-an