Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Insights into the Origin of Mass   Atomic nuclei are the core of everything we can see. At the first level of
approximation, their atomic weights are simply the sum of the masses of all the
nucleons they contain. Each nucleon has a mass $m_N \approx 1\,$GeV, i.e.
approximately 2000-times the electron mass. The Higgs boson produces the
latter, but what produces the nucleon mass? This is the crux: the vast bulk of
the mass of a nucleon is lodged with the energy needed to hold quarks together
inside it; and that is supposed to be explained by quantum chromodynamics
(QCD), the strong-interaction piece within the Standard Model. This
contribution canvasses the potential for a coherent effort in QCD phenomenology
and theory, coupled with experiments at existing and planned facilities, to
reveal the origin and distribution of mass by focusing on the properties of the
strong-interaction Nambu-Goldstone modes. Key experiments are approved at JLab
12; planned with COMPASS++/AMBER at CERN; and could deliver far-reaching
insights by exploiting the unique capabilities foreseen at an electron ion
collider.

8
The categories of this paper are: hep-ex
3
The categories of this paper are: physics
1
The categories of this paper are: cs
14
The categories of this paper are: math-ph
17
The categories of this paper are: q-fin
26
The categories of this paper are: bayes-an
29
The categories of this paper are: funct-an
24
The categories of this paper are: dg-ga
2
The categories of this paper are: math
27
The categories of this paper are: comp-gas
7
The categories of this paper are: hep-th
36
The categories of this paper are: cmp-lg
10
The categories of this paper are: q-bio
9
The categories of this paper are: nlin
13
The categories of this paper are: quant-ph
16
The categories of this paper are: stat