Dictionary.com
definitions
  • synonyms

sigma particle

See more synonyms on Thesaurus.com
noun Physics.
  1. an unstable hyperon having positive, negative, or zero electric charge and strangeness −1. Symbol: Σ

Origin of sigma particle

First recorded in 1960–65
Also called sigma baryon.
Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2018
sigma baryon in Science

sigma baryon

  1. 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.