https://cds.cern.ch/record/150509/files/198404302.pdf

Chiral Perturbation Theory: Expansions in the Mass of the Strange Quark

https://cds.cern.ch/record/192078/files/198811120.pdf

The Role of Resonances in Chiral Perturbation Theory

https://www.univie.ac.at/vienna.seminar/2009/talks/09_gasser.pdf

Chiral perturbation theory

This article provides a pedagogical introduction to the basic concepts of chiral perturbation theory and is designed as a text for a two-semester course on that topic. Section 1 serves as a general introduction to the empirical and theoretical foundations which led to the development of chiral perturbation theory. Section 2 deals with QCD and its global symmetries in the chiral limit; the concept of Green functions and Ward identities reflecting the underlying chiral symmetry is elaborated. In Section 3 the idea of a spontaneous breakdown of a global symmetry is discussed and its consequences in terms of the Goldstone theorem are demonstrated. Section 4 deals with mesonic chiral perturbation theory and the principles entering the construction of the chiral Lagrangian are outlined. Various examples with increasing chiral orders and complexity are given. Finally, in Sect. 5 the methods are extended to include the interaction between Goldstone bosons and baryons in the single-baryon sector, with the main emphasis put on the heavy-baryon formulation. At the end, the method of infrared regularization in the relativistic framework is discussed.

https://cds.cern.ch/record/589199/files/0210398.pdf

Introduction to Chiral Perturbation Theory

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).

/pdf/chiral-symmetry-and-the-bag-model-a-new-starting-point-for-2ovs7sh7ij.pdf

W. Pfeil

Papers

Compilation of Coupling Constants and Low-Energy Parameters. 1978 Edition

Compilation of coupling constants and low-energy parameters

Compilation of Coupling Constants and Low-Energy Parameters. 1976 Edition

Energy-independent multipole analysis of π0, π+ and π− photoproduction in the first resonance region

Multipole analysis of pi-zero and pi-plus photoproduction between threshold and 500 MeV