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D particle

noun, Physics.
1.
Origin of D particle
1975-1980
First recorded in 1975-80
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2017.
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D particle in Science
D particle  
Either of two subatomic particles in the meson family, one neutral and one positively charged, having masses 3,649 and 3,658 times that of the electron and average lifetimes of 4.2 × 10-13 and 1.1 × 10-12 seconds, respectively. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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