Lepton

A lepton (λεπτο) is also €0.01 in Greek. See: Greek euro coins.

A lepton (Greek for "light", as opposed to hadrons which are "heavy") is a subatomic particle that is not made of quarks.

There are 12 known types of lepton, 3 of which are matter particles (the electron, the muon and the tau), 3 corresponding neutrinos, and their 6 respective antiparticles. All known charged leptons have a single negative or positive electric charge (depending on whether they are particles or antiparticles) and all of the neutrinos and antineutrinos have neutral electric charge.

A table of the leptons

Name	Symbol	Electric charge	Mass(GeV)	Name	Symbol	Electric charge	Mass(GeV)
Charged particle / antiparticle				Neutrino / antineutrino
Electron / Antielectron (positron)	$e^{-}\,/\,e^{+}$	−1 / +1	0.000511	Electron neutrino / Electron antineutrino	$\nu _{e}\,/\,{\overline {\nu _{e}}}$	0	~0
Muon / Anti-muon	$\mu ^{-}\,/\,\mu ^{+}$	−1 / +1	0.1056	Muon neutrino / Muon antineutrino	$\nu _{\mu }\,/\,{\overline {\nu _{\mu }}}$	0	~0
Tau / Anti-tau	$\tau ^{-}\,/\,\tau ^{+}$	−1 / +1	1.777	Tau neutrino / Tau antineutrino	$\nu _{\tau }\,/\,{\overline {\nu _{\tau }}}$	0	~0