1 Quarks and leptons 1 1.1 Preamble 1 1.2 The Standard Model of particle physics 7 1.3 Particle classification: fermions and bosons 12 1.4 Particles and antiparticles 13 1.5 Free particle wave equations 16 1.6 Helicity states: helicity conservation 19 1.7 Lepton flavours 20 1.8 Quark flavours 22 1.9 The cosmic connection 26 Problems 33 2 Interactions and fields 35 2.1 Classical and quantum pict...