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(Reference retrieved automatically from SciELO through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Feynman diagrams: The power of a picture

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Arlene Cristina Aguilar
Total Authors: 1
Document type: Journal article
Source: Revista Brasileira de Ensino de Física; v. 40, n. 4, p. -, 2018.

Abstract The purpose of this paper is to present a brief introduction to QED Feynman diagrams. We will start with a concise historical description of how this powerful diagrammatic technique was developed by Feynman. Next, the basic elements, i.e. propagators and vertices, which form the diagrams are presented. We discuss the physical meaning associated with the diagrams and list the main Feynman rules, which are needed for the calculations at the lower perturbation level. Then, the following three fundamental QED processes are analyzed: (i) Bhabha scattering, (ii) Compton and (iii) the annihilation of the electron-positron pair. Finally, we will discuss how the perturbative series, at higher order, is generated graphically for the specific case of the Moller scattering. (AU)

FAPESP's process: 17/07595-0 - Nonperturbative aspects of the QCD Green's functions
Grantee:Arlene Cristina Aguilar
Support type: Regular Research Grants
FAPESP's process: 17/05685-2 - Hadronic physics in high energy nuclear collisions
Grantee:Jun Takahashi
Support type: Research Projects - Thematic Grants