| 单词 | j/psi particle |
| 释义 | J/psi particle[ jey-sahy, -psahy ] / ˈdʒeɪˈsaɪ, -ˈpsaɪ / noun Physics.the lightest of the psi particles, the first particle to be discovered that contains a charmed quark. Origin of J/psi particleFirst recorded in 1975–80; see J particle, psi particle Words nearby J/psi particleJ particle, JPEG, Jpn., J point, J-pop, J/psi particle, jr., JRA, JRC, JSA, J.S.D. Dictionary.com UnabridgedBased on the Random House Unabridged Dictionary, © Random House, Inc. 2020 British Dictionary definitions for J/psi particleJ/psi particle nouna type of elementary particle (meson) thought to be formed from charmed quarksSee charm 1 (def. 7) 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 Scientific definitions for J/psi particleJ/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 X 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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved. |
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