# Part II Particle Physics

## Dr Mark A. Thomson

### For my new (2006-) Part III Major Option Course, follow this link

 Course synopsis Examples Sheet (ps) (pdf) Part II Examples Class Problems: (ps) (pdf) Hints: (ps) (pdf) Answers: (ps) (pdf) Part III Examples Class Problems: (ps) (pdf) Answers: (ps) (pdf) Corrections (none so far) Interesting particle physics links

 Lecture transparencies (available online after lectures)
 1: Introduction to the Standard Model (pdf) 2: The Electromagnetic Interaction (pdf) 3: The Strong Interaction (pdf) 4: The Quark Model (pdf) 5: Spin, Helicity and the Dirac Equation (pdf) 6: The Weak Interaction (pdf) 7: Electroweak Unification (pdf) 8: The Standard Model and Beyond (pdf)

Introduction To The Standard Model: Historical introduction patterns/symmetries and models of the fundamental entities. Elementary particles - the modern view (quarks, leptons, antiparticles, hadrons). Forces of nature (electromagnetic, strong, weak, gravity). Gauge Bosons (photon, gluon, W± and Z0, graviton). Strength and range of interactions. Natural units. Four vectors. Klein-Gordon equation and anti-particles. Revision of particle scattering in Quantum Mechanics.

The Electromagnetic Interaction: Introduction to virtual particle exchange, propagators and Feynman diagrams. Electromagnetic interaction vertices (Quantum Electrodynamics). Some examples of pure QED processes. e+e- annihilation

Strong interaction: Quantum Chromodynamics. The strong force, gluons and colour. Properties of QCD; quark confinement, hadronic jets, asymptotic freedom and bound quark states. Strong interaction vertices. Experimental evidence for gluons, colour and the running of the strong coupling constant.

Quark Model of Hadrons: Discovery of the J/Psi. Resonances, particle decay and lifetimes, partial widths. The charmonium system.. Bottomonium and the b quark. C and P discrete symmetries. Models of light quark mesons. Quark structure of baryons. Meson and baryon masses and magnetic moments.

Spin, Helicity and the Dirac Equation: Relativistic quantum mechanics. The Weyl equations and Weyl spinors. Antiparticles, spin and helicity. Spin in e+e- annihilation. The Dirac Equation . Dirac spinors . Lorentz structure of the interactions .

Weak Interaction: Fermi Theory of beta-decay. Beta decay and parity violation. V-A theory. Origin of parity violation. Helicity in charged pion decay. W bosons and the charged weak current. Weak interaction of leptons and quarks. Weak interaction vertices. Cabibbo supression and the CKM matrix.

Electroweak Unification: Electroweak Unification and the Glashow-Weinberg-Salam Model. The weak neutral current and the Z0 resonance. Particle detection using the Opal detector as an example. Precision tests of the Standard Model at the Large Electron Positron collider (LEP).

The Standard Model and Beyond: Implications of current data. A brief history of the top quark. Neutrino oscillations, neutrino masses and neutrino detection. The Higgs Boson and its (non-)discovery. Grand Unification and Supersymmetry (if time allows). The many remaining mysteries.

MAT, 17-Oct-2004