charge conjugation

American Heritage
Science Dictionary
charge conjugation  
A reversal of the sign of the charge, the magnetic moment, and other internal quantum numbers of every particle in the system to which it is applied, effectively turning every particle into its antiparticle. In the mathematics of quantum mechanics, this operation is denoted by the operator "C". It had long been assumed that charge conjugation, together with parity conjugation, should leave the behavior of a physical system unchanged, but observations of kaon decay suggest this is not always the case. See also conservation law.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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Encyclopedia Britannica
Encyclopedia

charge conjugation

in particle physics, an operation that replaces particles with antiparticles (and vice versa) in equations describing subatomic particles. The name charge conjugation arises because a given particle and its antiparticle generally carry opposite electric charge. The positive electron, or positron, for example, is the antiparticle of the ordinary negative electron.

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Encyclopedia Britannica, 2008. Encyclopedia Britannica Online.
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