j-psi particle
noun Physics.
the lightest of the psi particles, the first particle to be discovered that contains a charmed quark.
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2013.
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Based on the Random House Dictionary, © Random House, Inc. 2013.
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Link To j-psi particle
Collins
World English Dictionary
| J/psi particle | |
| —n | |
| See charm a type of elementary particle (meson) thought to be formed from charmed quarks | |
Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
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2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009
Cite This Source
00:10
J-psi particle
is always a great word to know.
So is ninnyhammer. Does it mean:
| a fool or simpleton; ninny. |
| a scrap or morsel of food left at a meal. |
American Heritage
Science Dictionary
J/psi particle  (jā'sī', -psī') Pronunciation Key
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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Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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