Since the publication of the first edition, Particle Physics has become a standard introductory textbook for undergraduates and is used in universities worldwide. After a few momentous years in particle physics, this fourth edition comes as a timely and well-motivated textbook providing an updated overview of fundamental physics. There have recently been two important developments in the subject. The most significant of these is the discovery of the Higgs boson at the LHC. Major revisions on this topic focus on current research from a modern point of view. Secondly, there has also been substantial progress in neutrino physics. Sections have been re-written to take account of new important results on neutrino mixing and to discuss an outlook for future experiments. Particle Physics, Fourth Edition also includes updates on glueballs, the strong coupling constant, quark-gluon plasmas, the status of GUT, supersymmetry, string theory, astroparticle physics, and developments in neutrino physics, particularly large-scale detectors.