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J/psi particle

[jey-sahy, -psahy] /ˈdʒeɪˈsaɪ, -ˈpsaɪ/
noun, Physics.
1.
the lightest of the psi particles, the first particle to be discovered that contains a charmed quark.
Origin
1975-1980
1975-80; see J particle, psi particle
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Based on the Random House Dictionary, © Random House, Inc. 2014.
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British Dictionary definitions for j psi particle

J/psi particle

noun
1.
a type of elementary particle (meson) thought to be formed from charmed quarks See charm1 (sense 7)
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition
© William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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j psi particle in Science
J/psi particle
  (jā'sī', -psī')   
An electrically neutral meson having a mass 6,060 times that of the electron and a mean lifetime of approximately 1 × 10-20 seconds. The observation of this unusually long lifetime, in 1974, is what led to the hypothesis that other quarks existed in addition to the up, down, and strange quarks. It was the first firm experimental evidence for the charm quark and is considered to be a charm-anticharm quark pair. Also called J particle, psi particle. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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