Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Fixed-Target CP-Violation Experiments at Fermilab   Studies of CP violation, for 30 years focused primarily on the neutral K
meson, are on the threshold of a new era as experiments approach Standard-Model
sensitivities in decays of beauty, charm, and hyperons. The array of
heavy-quark experiments approved and planned at Fermilab may lead to a
significant breakthrough in the next five to ten years.

34
The categories of this paper are: chem-ph
13
The categories of this paper are: quant-ph
26
The categories of this paper are: bayes-an
27
The categories of this paper are: comp-gas
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The categories of this paper are: mtrl-th
7
The categories of this paper are: hep-th
9
The categories of this paper are: nlin
6
The categories of this paper are: astro-ph
19
The categories of this paper are: eess
29
The categories of this paper are: funct-an
16
The categories of this paper are: stat
10
The categories of this paper are: q-bio
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The categories of this paper are: ao-sci
18
The categories of this paper are: econ
32
The categories of this paper are: atom-ph
23
The categories of this paper are: solv-int