Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Strong Anomalies in Kaon Decays   We point to a potentially large contribution of the QCD trace anomaly to the
isoscalar pion pair production in Kaon decays. This contribution arises from
the long-distance evolution of a 7-dimensional quark-gluon operator generated
by short-distance QCD corrections to the Delta_S = 1 Fermi Hamiltonian.

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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: math-ph
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The categories of this paper are: chem-ph
6
The categories of this paper are: astro-ph
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The categories of this paper are: adap-org
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The categories of this paper are: solv-int
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The categories of this paper are: alg-geom
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The categories of this paper are: q-alg
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The categories of this paper are: quant-ph
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The categories of this paper are: funct-an
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The categories of this paper are: comp-gas
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The categories of this paper are: hep-th
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The categories of this paper are: ao-sci
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The categories of this paper are: acc-phys