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B particle

noun, Physics.
Origin of B particle
1965-70 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2015.
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B particle in Science
B particle  
Either of two subatomic particles in the meson family, one neutral and one positively charged, both of which have masses 10,331 times that of an electron and average lifetimes of 1.6 × 10-12 seconds. B particles contain bottom quarks. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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