Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Empirical Consequences of Emergent Mass   The Lagrangian that defines quantum chromodynamics (QCD), the strong
interaction piece of the Standard Model, appears very simple. Nevertheless, it
is responsible for an astonishing array of high-level phenomena with enormous
apparent complexity, e.g., the existence, number and structure of atomic
nuclei. The source of all these things can be traced to emergent mass, which
might itself be QCD's self-stabilising mechanism. A background to this
perspective is provided, presenting, inter alia, a discussion of the gluon mass
and QCD's process-independent effective charge and highlighting an array of
observable expressions of emergent mass, ranging from its manifestations in
pion parton distributions to those in nucleon electromagnetic form factors.

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The categories of this paper are: math
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The categories of this paper are: plasm-ph
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The categories of this paper are: q-fin
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The categories of this paper are: hep-th
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The categories of this paper are: eess
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The categories of this paper are: cond-mat
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The categories of this paper are: adap-org
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The categories of this paper are: math-ph
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The categories of this paper are: cmp-lg
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The categories of this paper are: quant-ph
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The categories of this paper are: chao-dyn
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The categories of this paper are: atom-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: solv-int
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The categories of this paper are: econ
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The categories of this paper are: comp-gas