Cosmic timeline 08 Simulation of a super-symmetry event (showing
leptons and missing transverse energy), with a Higgs particle
decaying to two Z particles and to four muons in the full
Compact Muon Solenoid detector. The Compact Muon Solenoid (CMS)
experiment is one of two large general-purpose particle physics
detectors built on the proton-proton Large Hadron Collider (LHC)
at CERN in Switzerland and France. The Lepton Epoch The lepton
epoch is defined as the time between 1 second and 10 seconds
after the Big Bang. The majority of hadrons and anti-hadrons
annihilate each other at the end of the hadron epoch, leaving
leptons and anti-leptons dominating the mass of the universe.
What is a lepton? Leptons are a family of elementary particles,
alongside quarks and gauge bosons. The name lepton comes from
the Greek λεπτός or leptos, meaning thin, and was first used by
physicist Léon Rosenfeld in 1948. So the name implies that all
the leptons are of small mass. The first lepton identified was
the electron, discove