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eta-c meson

[ ey-tuh-see, ee-tuh- ]
/ ˈeɪ təˈsi, ˈi tə- /
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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.
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Also called eta-c particle.

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Dictionary.com Unabridged Based on the Random House Unabridged Dictionary, © Random House, Inc. 2022

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