Lepton

In physica de particulas, un lepton es un particula elementari (Fermion) de spin 1⁄2 non sensibile al interaction forte.

Lista

Properties of leptons

Spin J	Nomine del particula o antiparticula	Symbolo	Carga Q (e)	Lepton flavor number			Masse (MeV/c2)	Vita duration (s)
				Le	Lμ	Lτ
1⁄2	Electron	e−	−1	+1	0	0	0.510998910  (±13)	Stable
	Positron	e+	+1	−1
	Muon	μ−	−1	0	+1	0	105.6583668  (±38)	2.197019×10−6 (±21)
	Antimuon	μ+	+1		−1
	Tau	τ−	−1	0	0	+1	1776.84  (±.17)	2.906×10−13 (±.010)
	Antitau	τ+	+1			−1
	Neutrino electronic	$\nu _{e}$	0	+1	0	0	<0.0000022	Unknown
	Antineutrino electronic	${\overline {\nu }}_{e}$		−1
	Neutrino muonic	$\nu _{\mu }$	0	0	+1	0	< 0.17	Unknown
	Antineutrino muonic	${\overline {\nu }}_{\mu }$			−1
	Neutrino tauic	$\nu _{\tau }$	0	0	0	+1	< 15.5	Unknown
	Antineutrino tauic	${\overline {\nu }}_{\tau }$				−1

Masses de neutrinos son non nulle a causa del phenomeno de oscillation de neutrinos, ma illos son multe basse.