Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The Brief Life of a Hadron: QCD unquenched   Once upon a time, the picture of hadrons was of mesons made of a quark and an
antiquark, and baryons of three quarks. Though hadrons heavier than the ground
states inevitably decay by the strong interaction, the successes of the quark
model might suggest their decays are a mere perturbation. However, Eef van
Beveren, whose career we celebrate here, recognised that decays are an integral
part of the life of a hadron. The channels into which they decay are often
essential for their very existence. These hold the secrets of strong coupling
QCD and teach us the way quarks really build hadrons.

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The categories of this paper are: eess
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
4
The categories of this paper are: cond-mat
34
The categories of this paper are: chem-ph
3
The categories of this paper are: physics
15
The categories of this paper are: nucl-ex
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The categories of this paper are: solv-int
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The categories of this paper are: cmp-lg
1
The categories of this paper are: cs
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The categories of this paper are: q-fin
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: astro-ph
7
The categories of this paper are: hep-th
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The categories of this paper are: alg-geom