Particles Unit 1 Part 2

Particles Unit 1 Part 2

1. Hadrons

   • Hadrons = particles which feel the strong force
   • Nucleus made up of Neutrons and Protons
   • Protons are +1 charge meaning need a strong force to hold them together
   • Aren't fundamental particles - formed of quarks
   • 2 types of hadrons = Mesons and Baryons

2. Baryons

   • Proton
     • Only stable Baryon
     • Charge = +1 Charge = +1
     • Antiproton is the opposite
   • Neutron
     • Neutrons are Baryons that decay into Protons
     • Neutron = Proton + Electron + Antineutrino
     • Baryon number = +1 Charge = 0
   • All Baryon particles end up as a Proton because it's stable
   • Antiprotons and Antineutrons are all Anti-Baryons
   • Protons and Neutrons both have a Baryon number of B = 1
   • Anti-Baryons have a Baryon number of B = -1

3. Mesons

   • All Mesons are unstable and have Baryon number = 0
   • Pions (π)
     • The lightest Mesons
     • Positive Pion, Negative Pion and Pion Neutral
   • Kaons (K)
     • Heavier and more unstable
     • Includes strangeness

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