Particle physics is a branch of physics that studies the elementary subatomic constituents of matter and radiation, and the interactive relationship between them. It is also called high energy physics, because many elementary particles do not occur under normal circumstances in nature due to energetic instability, but can be created and detected during high energy collisions with other particles, as is done in particle accelerators.
Lecture One - The Nature of Physics
Lecture Two - The Standard Model of Particle Physics
Lecture Three - The Pre-History of Particle Physics
Lecture Four - The Birth of Modern Physics
Lecture Five - Quantum Mechanics Get Serious
Lecture Six - New Particles And New Technologies