Chiral symmetry and the bag model: A new starting point for nuclear physics

Journal Article · Sun Jan 01 04:00:00 EST 1984 · Adv. Nucl. Phys.; (United States)

DOI:https://doi.org/10.1007/978-1-4613-9892-9_1· OSTI ID:6847071

Thomas, A W

This chapter attempts to give the reader a fairly good working knowledge of the MIT bag model, as well as a degree of familiarity with chiral symmetry. Offers a detailed summary of the model, its underlying assumptions, its solutions, its predictions for the properties of single hadrons, and its unresolved problems. Explains the concept of chiral symmetry and why it must be broken in nature even though it is exact in pure QCD. Reviews the various attempts which have been made over the last 3 yrs. to make a bag model incorporating chiral symmetry. Discusses the basic bag model; the spectroscopy of low-lying states; attempts to derive a bag model; the relationship to nonrelativistic quark models; hadronic properties in the MIT bag model; charge radii; magnetic moments; the axial current; center of mass corrections; chiral symmetry; Lagrangian formulation of the MIT bag model; conserved currents in Lagrangian field theory; the axial current; the sigma-model and spontaneous symmetry breaking; bag models with chiral symmetry; motivation; the work of Chodos and Thorn; the cloudy bag model; applications of the cloudy bag model; a Hamiltonian for low- and medium-energy physics; the nucleon; pion-nucleon scattering; magnetic moments of the nucleon octet; a new view of nuclear physics; the nucleon-nucleon force; symmetry breaking as a clue; and the nuclear many-body problem. Identifies the need to firmly establish a relationship between the MIT bag model, soliton bag models, and QCD.

• Research Organization: Division TH, CERN 1211 Geneva 23
• DOE Contract Number: AC02-76ER03074
• OSTI ID: 6847071
• Journal Information: Adv. Nucl. Phys.; (United States), Journal Name: Adv. Nucl. Phys.; (United States) Vol. 13; ISSN ANUPB
• Country of Publication: United States
• Language: English

Related Subjects

645400* -- High Energy Physics-- Field Theory
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS
BAG MODEL
BARYON-BARYON INTERACTIONS
BARYONS
CHIRAL SYMMETRY
COMPOSITE MODELS
ELEMENTARY PARTICLES
EXTENDED PARTICLE MODEL
FERMIONS
FIELD THEORIES
HADRON-HADRON INTERACTIONS
HADRONS
HAMILTONIANS
INTERACTIONS
LAGRANGIAN FIELD THEORY
MAGNETIC MOMENTS
MANY-BODY PROBLEM
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
MESON-BARYON INTERACTIONS
MESON-NUCLEON INTERACTIONS
NUCLEON-NUCLEON INTERACTIONS
NUCLEONS
PARTICLE INTERACTIONS
PARTICLE MODELS
PION-NUCLEON INTERACTIONS
QUANTUM CHROMODYNAMICS
QUANTUM FIELD THEORY
QUANTUM OPERATORS
QUARK MODEL
SYMMETRY