Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: CP-Violating Effect of QCD Vacuum in Quark Fragmentation   We demonstrate that the non-trivial CP-violating structure of QCD vacuum can
lead to an observable effect in $e^+e^-\to q\bar q\to 2$-jet annihilation. We
find that the sign of the jet handedness correlation can be opposite to that
predicted by factorization of $q~\bar q$ fragmentation and CP-conjugation of
the two jets. A simple model estimation of the handedness correlation magnitude
is given.

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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
22
The categories of this paper are: chao-dyn
33
The categories of this paper are: plasm-ph
18
The categories of this paper are: econ
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
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The categories of this paper are: math-ph
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The categories of this paper are: nucl-ex
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The categories of this paper are: q-fin
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The categories of this paper are: cmp-lg
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The categories of this paper are: chem-ph
4
The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
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The categories of this paper are: alg-geom