psi particle

psi particle

[sahy, psahy]
noun Physics.
1.
any of a family of mesons consisting of a charmed quark and a charmed antiquark.
2.
an early name for the J/psi particle.

Origin:
1970–75

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World English Dictionary
psi particle
 
n
See J/psi particle

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
psi particle   (sī, psī)  Pronunciation Key 
See J/psi particle.
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
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