The Muon Is An Elementary Particle
Similar To The Electron, With The
Same Electric Charge Of - E, But
With A Much Greater Mass
(About 207 Times As Massive As
The Electron In The Frame In
Which Both Particles Are At Rest).
Unlike The Electron, However,
The Muon Is Unstable. The Muon
Has A Mean Lifetime Of About 2.20
Microseconds In The Frame In
Which It Is At