An Introduction to Particle Physics through Symmetry

This textbook explains how modern particle physics is built from the concept of symmetry. Instead of beginning with a catalogue of particles, the book introduces the mathematical and physical foundations, i.e. groups, representations, Lorentz invariance, and gauge symmetry, that shape quantum field theory and naturally lead to the Standard Model. Scalar, fermion, and gauge fields are presented step by step, with clear derivations, worked examples, and a wide range of exercises. The book then offers a systematic treatment of spontaneous symmetry breaking and the Higgs mechanism, before assembling the full Standard Model and examining both its experimental successes and its known limitations. The closing chapters explore the evidence and theoretical motivations for physics beyond the Standard Model. The book is intended for advanced undergraduates and beginning graduate students in physics, especially those studying theoretical particle physics or quantum field theory. It assumes prior knowledge of quantum mechanics and special relativity.