sigma particle

noun Physics.

an unstable hyperon having positive, negative, or zero electric charge and strangeness −1. Symbol: Σ

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Also called sigma baryon.

Origin of sigma particle

First recorded in 1960–65

Words nearby sigma particle

sigla, siglos, sigma, sigma baryon, sigma factor, sigma particle, sigmate, sigmatism, sigmoid, sigmoid artery, sigmoid colon
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2020

Scientific definitions for sigma baryon

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 © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.