Lepton

A lepton (Greek for "light", as opposed to hadrons which are "heavy") is a subatomic particle that is not made of quarks. The leptons are the electron, the muon, the tau, and their respective neutrinos.

All known leptons have a negative or neutral charge. There are 6 types of lepton, 3 of which are negative, the other 3 neutral.

A Table of the Leptons

Name	Charge	Mass(GeV)
Electron	-1	0.000511
Electron Neutrino	0	~0
Muon	-1	0.1056
Muon Neutrino	0	~0
Tau	-1	1.777
Tau Neutrino	0	~0