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This entry contributed by Leonardo Motta
In order to visualize and describe quantum electrodynamical interactions, physicist Richard
P. Feynman  introduced an ingenious schematic form of drawing now called a Feynman diagram. In such a diagram,
all particles are represented by lines, with straight lines representing fermions and wavy lines representing bosons
(except for the Higgs boson, which is usually represented by a dashed line, and gluons, which
are usually represented by loops).
The diagram illustrated above represents the interaction of two electrons. Each electron is represented by a straight
line, which exchange a (virtual) photon and then repel one other.
 Fine Structure Constant, Quantum Electrodynamics
References
Berestetskii, V. B.; Lifschitz, E. M.; and Pitaevskii, L. P. Quantum Electrodynamics, 2nd ed. Oxford, England:
Pergamon Press, 1982.
Feynman, R. P. "Space-Time Approaches to Quantum Electrodynamics." Phys. Rev. 76, 769-789, 1949.
Feynman, R. P. QED: The Strange Theory of Light and Matter. Princeton, NJ: Princeton University Press, 1985.
Griffiths, D. Introduction to Elementary Particles. New York: Wiley, 1987.
Johnson, G. W. and Lapidus, M. L. The Feynman Integral and Feynman's Operational Calculus.
Oxford, England: Oxford University Press, 2000.
Kane, G. The Particle Garden. Reading, MA: Addison-Wesley, p. 169, 1995.
Mattuck, R. D. A Guide to Feynman Diagrams in the Many-Body Problem, 2nd ed. New York: Dover, 1992.
 Weisstein, E. W. "Books about Feyman Diagrams."
http://www.ericweisstein.com/encyclopedias/books/FeynmanDiagrams.html.
© Eric W. Weisstein
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