tau particle

World English Dictionary
tau particle
 
n
physics another name for tauon

Collins English Dictionary - Complete & Unabridged 10th Edition
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American Heritage
Science Dictionary
tau particle  
An elementary particle of the lepton family, having a mass about 3,550 times that of the electron, a negative electric charge, and a mean lifetime of 3 × 10-13 seconds. See Table at subatomic particle.
The American Heritage® Science Dictionary
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