Tau-particle meaning

An unstable, negatively charged lepton with a mass of c. 1,777 MeV/c2 (or c. 3,490 times that of an electron) and a mean lifetime of 2.2 ×10-13 second.
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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&spminus;13 seconds.
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