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A Brief Introduction to Dispersion Relations: With Modern Applications

A Brief Introduction to Dispersion Relations: With Modern Applications

Paperback

Series: Springerbriefs in Physics

Physics

ISBN10: 3030135810
ISBN13: 9783030135812
Publisher: Springer
Published: Apr 2 2019
Pages: 141
Weight: 0.49
Height: 0.33 Width: 6.14 Depth: 9.21
Language: English

This text offers a brief introduction to the dispersion relations as an approach to calculate S-matrix elements, a formalism that allows one to take advantage of the analytical structure of scattering amplitudes following the basic principles of unitarity and causality.

First, the case of two-body scattering is considered and then its contribution to other processes through final-state interactions is discussed. For two-body scattering amplitudes, the general expression for a partial-wave amplitude is derived in the approximation where the crossed channel dynamics is neglected. This is taken as the starting point for many interesting nonperturbative applications, both in the light and heavy quark sector. Subsequently crossed channel dynamics is introduced within the equations for calculating the partial-wave amplitudes. Some applications based on methods that treat crossed-channel dynamics perturbatively are discussed too.

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