eta-c particle

eta-c meson

[ey-tuh-see, ee-tuh-]
noun Physics.
a neutral meson having a mass 5832 times that of the electron and a mean lifetime of approximately 3.1 × 10 -22 seconds.
Also called eta-c particle.
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American Heritage
Science Dictionary
eta-c particle   (ā'tə-sē', ē'tə-)  Pronunciation Key 
An electrically neutral meson having a mass 5,832 times that of the electron and a mean lifetime of approximately 3.1 × 10-22 seconds. See Table at subatomic particle.
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