Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Probing the Boundary of the Non-Perturbative QCD by Small Size
  Instantons   The lattice data on the instanton size distribution suggest an additional
O($\rho^2)$ action. The small-$\rho$ effect O($\rho^4)$ predicted by the
Operator Product Expansion (OPE) is not observed. Similar deviations are also
found for non-perturbative response to a small static color dipoles: it is O(r)
not O(r$^2$). We suggest that small instanton radii in the QCD vacuum and small
radii of the QCD strings (to which this observation relates) are consequences
of the same phenomenon: a very robust dual superconductivity in the QCD vacuum,
with relatively large Higgs VEV and surprisingly large Higgs mass.

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The categories of this paper are: atom-ph
21
The categories of this paper are: adap-org
8
The categories of this paper are: hep-ex
23
The categories of this paper are: solv-int
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The categories of this paper are: supr-con
20
The categories of this paper are: acc-phys
6
The categories of this paper are: astro-ph
15
The categories of this paper are: nucl-ex
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The categories of this paper are: q-alg
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The categories of this paper are: funct-an
10
The categories of this paper are: q-bio
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The categories of this paper are: eess
2
The categories of this paper are: math
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The categories of this paper are: patt-sol
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The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th