Matter and Antimatter

Matter and Antimatter

1. Hadrons

   • Interact through strong interactions
   • Baryons
     • Protons and hadrons that decay into protons
     • Protons
     • Neutrons
     • Consist of three quarks (antibaryons - antiquarks)
     • Baryon number must be conserved in any reaction
       • Baryon: +1
       • Antibaryon: -1
       • Meson/Lepton: 0
   • Mesons
     • K mesons
     • π mesons
     • Do not include protons in their decay products
     • Consists of a quark-antiquark pair

2. Leptons

   • Electrons
   • Muons
   • Neutrinos
   • Can change into other leptons through weak interaction
   • Can be produced or annihilated in particle-antiparticle interactions
   • Lepton number must be conserved
     • Lepton: +1
     • Antilepton: -1
     • Non lepton: 0
   • Do not interact through strong interaction
   • Don't break down into non-leptons (fundamental particles)