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.
Authoritative information on particle properties is compiled by the Particle Data Group http://pdg.lbl.gov
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
External Link