Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Instantons and Single Spin Asymmetries   A new mechanism for single spin asymmetries in strong interaction is
proposed. It is based on instanton-induced nonperturbative chromomagnetic
quark-gluon interaction. We estimate the contribution of this interaction to
single spin asymmetry in quark-quark scattering. It is shown, that interference
between quark spin-flip amplitude induced by instantons and spin-nonflip
amplitude, which is related to nonperturbative two gluon exchange, gives a
large value for a single spin asymmetry. Due to strong increasing of the
instanton-induced spin-flip amplitude with energy, this asymmetry does not
vanish at high energies.

13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
3
The categories of this paper are: physics
24
The categories of this paper are: dg-ga
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The categories of this paper are: q-fin
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The categories of this paper are: eess
26
The categories of this paper are: bayes-an
25
The categories of this paper are: patt-sol
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph
27
The categories of this paper are: comp-gas
28
The categories of this paper are: alg-geom
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
31
The categories of this paper are: ao-sci
5
The categories of this paper are: gr-qc