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definitions

psi particle

[ sahy, psahy ]
/ saɪ, psaɪ /

noun Physics.

any of a family of mesons consisting of a charmed quark and a charmed antiquark.
an early name for the J/psi particle.

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Nearby words

  1. pseudoxanthoma elasticum,
  2. psf,
  3. psg,
  4. pshaw,
  5. psi,
  6. psi phenomenon,
  7. psia,
  8. psid,
  9. psig,
  10. psilanthropic

Origin of psi particle

First recorded in 1970–75
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

British Dictionary definitions for psi particle

psi particle

noun

See J/psi particle
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

Science definitions for psi particle (1 of 2)

psi particle

[ sī, psī ]

See J/psi particle.

Science definitions for psi particle (2 of 2)

psi′ particle

[ sī′prīm′, psī′- ]

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.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.