The Bonn Meson Exchange Model for the Nucleon Nucleon Interaction

Heat kernel expansion: user's manual

The authors review the theory and phenomenology of instantons in quantum chromodynamics (QCD). After a general overview, they provide a pedagogical introduction to semiclassical methods in quantum mechanics and field theory. The main part of the review summarizes our understanding of the instanton liquid in QCD and the role of instantons in generating the spectrum of light hadrons. The authors also discuss properties of instantons at finite temperature and how instantons can provide a mechanism for the chiral phase transition. They give an overview of the role of instantons in some other models, in particular low-dimensional sigma models, electroweak theory, and supersymmetric QCD.

http://wonka.physics.ncsu.edu/~tmschaef/physics/RevModPhys_Instantons.pdf

Instantons in QCD

https://www.physi.uni-heidelberg.de/~fschney/2008SS-Preseminar/buballarev.pdf

NJL-model analysis of dense quark matter

Classical nuclear theory deals with a many-body system of neutrons and protons interacting nonrelativistically through two-body potentials. It has, of course, long been realized that there must be corrections to this simple picture—for example, the meson exchange effects which preclude a simple interpretation of the magnetic moment of the deuteron in terms of d-state probability. Nevertheless, the availability of beams of pions, and the consequent ability to study the excitation of real isobars in nuclei, has been critical in the realization that for many problems one must develop a theoretical model which explicitly includes pion and isobar degrees of freedom (see, for example, the proceedings of recent topical conferences Cat+ 82, MT 80).

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Chiral Symmetry and the Bag Model: A New Starting Point for Nuclear Physics

A previously derived model in which a baryon is treated as a three-quark bag that is surrounded by a cloud of pions is used to compute the static properties of the nucleon. The only free parameter of the model is the bag radius which is fixed by a fit to pion-nucleon scattering in the (3,3)-resonance region to be about 0.8 fm. With the model so determined the computed values of the root-mean-square radii and magnetic moments of the neutron and proton, and ${g}_{A}$, are all in very good agreement with the experimental values. In addition, about one-third of the $\ensuremath{\Delta}$-nucleon mass splitting is found to come from pionic effects, so that our extracted value of ${\ensuremath{\alpha}}_{s}$ is smaller than that of the MIT bag model.

Cloudy bag model of the nucleon

The Cloudy Bag Model. 1. The (3,3) Resonance

Pion-nucleon scattering in the Brown-Rho bag model☆

Magnetic Moments of the Nucleon Octet Calculated in the Cloudy Bag Model

We calculate the lowest-order pionic corrections to the magnetic moments of the strange members of the nucleon octet. The overall agreement is remarkably good, but one would like to see an improvement in the data for ..sigma../sup -/ and ..xi../sup -/.

S. Theberge

Papers

Cloudy bag model of the nucleon

The Cloudy Bag Model. 1. The (3,3) Resonance

Pion-nucleon scattering in the Brown-Rho bag model☆

Magnetic Moments of the Nucleon Octet Calculated in the Cloudy Bag Model

Magnetic moments of the nucleon octet calculated in the cloudy bag model