Unit 1: Particle Physics

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  • Created by: Anabuddy
  • Created on: 10-09-12 22:14

All known matter particles are made of quarks and leptons, and they interact by exchanging force-carrier particles (exchange particles)

Quarks have a fractional electric charge and a colour charge. They are fundamental particles.


  • p + p-bar → 2γ

The energy of the 2γ photons comes from the rest energy of the particle and its antiparticle, (e.g. proton rest mass= 938 MeV, so 2γ= 1876 MeV).

Pair Production

  • γ→ p + p-bar

When a high-energy photon interacts with a particle, e.g. a neutron, a particle and its antiparticle can be produced if there is enough energy, ie. energy of γ ≥ rest energy of


Harriet Rhodes - Jones



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