Fundamental principles of particle physics G.Ross, CERN, July08
Fundamental principles of particle physics G.Ross, CERN, July07 Introduction - Fundamental particles and interactions Symmetries I - Relativity Quantum field theory - Quantum Mechanics + relativity Theory confronts experiment - Cross sections and decay rates Symmetries II – Gauge symmetries, the Standard Model Fermions and the weak interactions Outline
Fundamental principles of particle physics G.Ross, CERN, July07 Fundamental Interactions
Fundamental principles of particle physics G.Ross, CERN, July07 Fundamental Particles Fundamental Interactions
Fundamental principles of particle physics G.Ross, CERN, July07 Fundamental Particles Fundamental Interactions
Fundamental principles of particle physics G.Ross, CERN, July07 Fundamental Particles Fundamental Interactions Strength Size
E r
Units Natural Units Length : L Time : T Energy : E or Mass : m Choose units such that : 1 unit left : choose
Natural Units Dimensionless- same in any units
Fundamental Interactions and sizes Atomic binding : Nuclear binding :
Elementary particles Leptons : Quarks : Isador Rabi 1937 “Who ordered the muon?”
Elementary particles Leptons : Quarks : Hadrons :3 strong “colour” charges
Elementary forces
The strength of the force Exchange forces Experiments conducted in momentum space : Electromagnetism Photon “propagator” Feynman diagram
Experiments conducted in momentum space : Exchange forces Electromagnetism
Feynman diagram Application to a scattering processes
(Q 2 ) In momentum space : g Exchange forces Strong interactions
(Q 2 ) In momentum space : Z Exchange forces Weak force Yukawa interaction
(Q 2 ) G Exchange forces Gravitational force
(Q 2 ) G Exchange forces Gravitational force