Classification of particles

• What is a hadron

  Both Baryons and mesons are hadrons, hadrons are made of 2 or more quarks held together by the strong nuclear force
• what are the classes of hadrons

  • Baryons (3 quarks)
  • Mesons (1 quark, 1 antiquark)
• The pion and kaon are both examples of which class of particle

  Mesons
• The pion can be an exchange particle for which force

  the strong nuclear force
• What particle does a kaon decay into

  Pion
• Give some examples of baryons

  • Proton (uud)
  • Neutron (ddu)
• What is significant about a proton

  • only stable baryon
  • All baryons will eventually decay into a proton
• What are some examples of leptons

  • Electron
  • Muon
  • neutrino
  • (The antiparticles of the above)
• What does a muon decay into

  An electron and two types of neutrinos
• What is the strangeness value of a strange quark

  -1
• True or False: “strangeness is always conserved in the weak interaction”

  False, only in the strong interaction
• how are strange particles formed

  They are formed from the strong interaction and decay through the weak interaction