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sigma particle

noun, Physics.
1.
an unstable hyperon having positive, negative, or zero electric charge and strangeness −1. Symbol: Σ.
Also called sigma baryon.
Origin
1960-1965
1960-65
Dictionary.com Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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sigma baryon in Science
sigma baryon  
Any of three unstable subatomic particles in the baryon family, having a mass 2,328 to 2,343 times that of the electron and a positive, neutral, or negative electron charge. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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