psi' particle

Science Dictionary
psi' particle   (sī'prīm', psī'-)  Pronunciation Key 
An electrically neutral meson having a mass 7,213 times that of the electron and a mean lifetime of approximately 1 × 10-20 seconds, composed, like the J/psi particle, of a charm-anticharm quark pair. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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