Assertion: tau lepton | /r/HasAspect | a mass of 1776.86 mev/c2
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Source sentences:
text: Tau leptons have a lifetime of 2.9×10−13 s and a mass of 1776.86 MeV/c2 (compared to 105.66 MeV/c2 for muons and 0.511 MeV/c2 for electrons).