sigma particle

noun Physics.

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

Nearby words

  1. sigla,
  2. siglos,
  3. sigma,
  4. sigma baryon,
  5. sigma factor,
  6. sigmate,
  7. sigmation,
  8. sigmatism,
  9. sigmoid,
  10. sigmoid artery

Origin of sigma particle

First recorded in 1960–65

Also called sigma baryon. Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2019

Science 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.