sigma particle

noun Physics.

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

Nearby words

sigla, siglos, sigma, sigma baryon, sigma factor, sigma particle, sigmate, sigmation, sigmatism, sigmoid, sigmoid artery

Origin of sigma particle

First recorded in 1960–65

Also called sigma baryon.

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.