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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.
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Origin of psi particle

First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018

British Dictionary definitions for psi particle

psi particle

noun
  1. See J/psi particle
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Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012

psi particle in Science

psi particle

[sī, psī]
  1. See J/psi particle.
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psi′ particle

[sīprīm, psī-]
  1. An electrically neutral meson having a mass 7,213 times that of the electron and a mean lifetime of approximately 1 X 10-20 seconds, composed, like the J/psi particle, of a charm-anticharm quark pair. See Table at subatomic particle.
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The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.