Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hadron Physics and QCD: Just the Basic Facts   With discovery of the Higgs boson, the Standard Model of Particle Physics
became complete. Its formulation is a remarkable story; and the process of
verification is continuing, with the most important chapter being the least
well understood. Quantum Chromodynamics (QCD) is that part of the Standard
Model which is supposed to describe all of nuclear physics and yet, almost
fifty years after the discovery of quarks, we are only just beginning to
understand how QCD moulds the basic bricks for nuclei: pious, neutrons,
protons. QCD is characterized by two emergent phenomena: confinement and
dynamical chiral symmetry breaking (DCSB), whose implications are
extraordinary. This contribution describes how DCSB, not the Higgs boson,
generates more than 98% of the visible mass in the Universe, explains why
confinement guarantees that condensates, those quantities that were commonly
viewed as constant mass-scales that fill all spacetime, are instead wholly
contained within hadrons, and elucidates a range of observable consequences of
confinement and DCSB whose measurement is the focus of a vast international
experimental programme.

23
The categories of this paper are: solv-int
8
The categories of this paper are: hep-ex
27
The categories of this paper are: comp-gas
31
The categories of this paper are: ao-sci
16
The categories of this paper are: stat
9
The categories of this paper are: nlin
24
The categories of this paper are: dg-ga
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
14
The categories of this paper are: math-ph
22
The categories of this paper are: chao-dyn
3
The categories of this paper are: physics
1
The categories of this paper are: cs
37
The categories of this paper are: supr-con
10
The categories of this paper are: q-bio
4
The categories of this paper are: cond-mat