Muon

A muon is an elementary particle that carries a negative elementary charge −e, where

e = 1.60218 × 10^-19 C.

The muon mass is 1.88353 × 10^-28 kg = 105.7 MeV/c², which is 206.8 times the mass of the electron.

Muons are not stable particles, and decay with a mean lifetime of 2.2 × 10^-6 s.