Particle Interactions

Particle Interactions

1. Force is created when the exchange particle moves between the other particles

   • exchange particles are also known as bosons

2. Four fundamental forces

   • Strong nuclear force
     • Felt by quarks
     • Exchange particle is pions
   • Weak intermolecular force
     • Felt by any particle
     • Exchange particle is W+ and W- bosons
   • Electromagnetic force
     • Felt by any charged particle
     • Exchange particle is virtual photons
   • Gravitational force
     • Felt by any particle with mass
     • Exchange particle is gravitons (not yet observed)

3. Feynman Diagrams

   • WIF
   • SNF
   • EMF
   • EC
   • EPC

4. Electron Capture

   • A proton can sometimes interact through the weak force with an inner sheel electron. The proton turns into a neutron and the electron turns into a neutrino, by the exchange of a W+ boson.

5. Electron-Proton Collisions

   • If an electron and a proton collide at very high speed, they can interact through the weak force. The proton turns into a neutron and the electron turns into a neutrino by the exchange of a W- boson.

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