Quarks and leptons

• Muon 


  A type of lepton with a mass over 200 times an electron that will decay into an electron
• Pion


  A type of meson and the exchange particle for the strong nuclear force
• Kaon


  A type of meson that decays into pions
• Quark 


  A group of elementary subatomic particles, consisting of up, down and strange. Quarks make up hadrons
• Meson 


  A class of hadron that is made up of a quark and antiquark pair
• Hadrons 


  A class of subatomic particle that experiences the strong nuclear interaction, made up of quarks
• Lepton


  A group of elementary subatomic particles of electrons, muons and neutrinos.
• Lepton number

  A quantum number that is conserved in all particle interactions. both electron lepton number and muon lepton numbers must be conserved.
• Baryon 


  A class of hadron, that is made up of three quarks. The proton is the only stable baryon.
• Baryon number


  a quantum number that is conserved in all particle interactions. Baryons have a baryon number if +1 and none baryons have a baryon number of 0
• Strange particles 


  Particles that are produced through strong interaction but decay through the weak interaction.
• Strangeness


  A quantum number that is conserved in strong nuclear interactions but not in weak interactions. This reflects that strange particles are always produced in pairs.