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Encyclopedia > Leptons
A lepton is also a unit of currency.

In physics, a particle is a lepton if it has a spin of 1/2 and does not experience the strong nuclear force. The leptons form a family of elementary particles that are distinct from the gauge bosons and the quarks.


The name "lepton" comes from the Greek λεπτόν, meaning "small" or "thin". However, this name originates from before the discovery of a particularly heavy lepton called the tauon. The tauon is nearly twice the mass of a proton.


There are 12 known types of lepton, 3 of which are matter particles (the electron, the muon and the tauon), 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. In general, the number of leptons of the same type (electrons and electron neutrinos; muons and muon neutrinos; tauons and tau neutrinos) remains the same when particles interact (known as conservation of lepton number).


A table of the leptons

Charged particle / antiparticle Neutrino / antineutrino
Name Symbol Electric charge Mass(GeV) Name Symbol Electric charge Mass(GeV)
Electron / Antielectron (positron) −1 / +1 0.000511 Electron neutrino / Electron antineutrino 0 ~0
Muon / Antimuon −1 / +1 0.1056 Muon neutrino / Muon antineutrino 0 ~0
Tauon / Antitauon −1 / +1 1.777 Tau neutrino / Tau antineutrino 0 ~0

See also

External links

  • The Particle Data Group (http://pdg.lbl.gov) who compile authoritative information on particle properties.

Particles in Physics - Elementary particles

edit  (http://en.wikipedia.org/w/index.php?title=Template:Elementary&action=edit)
Fermions : Quarks | Leptons
Gauge bosons : Photon | W+, W- and Z0 bosons | Gluons
Not yet observed
Higgs boson | Graviton
Supersymmetric Partners : Neutralinos | Charginos | Gravitino | Gluinos | Squarks | Sleptons

  Results from FactBites:
 
Lepton - Wikipedia, the free encyclopedia (229 words)
The leptons form a family of elementary particles that are distinct from the gauge bosons and the quarks.
There are 12 known types of lepton, 3 of which are matter particles (the electron, the muon and the tauon), 3 corresponding neutrinos, and their 6 respective antiparticles.
Leptons from the Georgia State University is a small summary of the Lepton.
Lepton (currency) - Wikipedia, the free encyclopedia (135 words)
Lepton pl. Lepta (Λεπτόν pl. Λεπτά) is the name of various fractional units of currency used in the Greek-speaking world from antiquity until today.
The Roman mite was informally called lepton in the Greek-speaking parts of the Roman Empire; this use is seen in the New Testament.
In modern Greece, lepton (modern form: lepto, Λεπτό) is the name of the 1/100 denomination of all the official currencies of the Greek state: The Phoenix (1827-1832), the Drachma (1832-2001) and the Euro (2002-current).
  More results at FactBites »

 
 

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