psi particle

[sahy, psahy]

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.

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

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

psi particle in Science

psi particle

[sī, psī]

See J/psi particle.

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.