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eta meson

noun, Physics.
a neutral meson with strangeness 0 that is its own antiparticle. Symbol: η.
Also called eta particle.
Origin of eta meson
1960-65 Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2016.
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eta particle in Science
eta particle
  (ā'tə, ē'tə)   
An electrically neutral meson having a mass 1,071 times that of the electron and a mean lifetime of approximately 3.5 × 10-8 seconds. See Table at subatomic particle.
The American Heritage® Science Dictionary
Copyright © 2002. Published by Houghton Mifflin. All rights reserved.
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