Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: VA\tilde V correlator within the instanton vacuum model   The correlator of vector and nonsinglet axial-vector currents in the external
electromagnetic field is calculated within the instanton liquid model of QCD
vacuum. In general the correlator has two Lorentz structures: longitudinal w_L
and transversal w_T with respect to axial-vector index. Within the instanton
model the saturation of the anomalous w_L structure is demonstrated. It is
known that in the chiral limit the transversal structure w_T is free from
perturbative corrections. In this limit within the instanton model we calculate
the transversal invariant function w_T at arbitrary momentum transfer, q, and
show the absence of power corrections to this structure at large q^2. Instead
there arise the exponential corrections to w_T at large q^2 reflecting nonlocal
properties of QCD vacuum. The slope of w_T at zero virtuality, the QCD vacuum
magnetic susceptibility of the quark condensate and its momentum dependence are
estimated.

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The categories of this paper are: nlin
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The categories of this paper are: bayes-an
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The categories of this paper are: patt-sol
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The categories of this paper are: mtrl-th
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The categories of this paper are: atom-ph
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The categories of this paper are: chem-ph
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The categories of this paper are: hep-ex
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The categories of this paper are: physics
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The categories of this paper are: eess
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The categories of this paper are: nucl-ex
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The categories of this paper are: math
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The categories of this paper are: hep-lat
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The categories of this paper are: cond-mat
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The categories of this paper are: comp-gas
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The categories of this paper are: cmp-lg
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The categories of this paper are: q-fin