The book titled **“An Introduction to Quantum Field Theory”** serves as a textbook designed for a graduate-level physics course encompassing topics like relativistic quantum mechanics, quantum electrodynamics, and the use of Feynman diagrams. Its authors, Michael E. Peskin and Daniel V. Schroeder hold positions as physics professors at Stanford University and Weber State University, respectively. Originally published in 1995 by Addison-Wesley Publishing Company, the book underwent a reprinting by CRC Press in 2018.

The book consists of** four parts and 22 chapters**, covering topics such as:

**Part I: Feynman Diagrams and Quantum Electrodynamics**.

This part introduces the basic concepts and techniques of quantum field theory, such as the Klein-Gordon and Dirac fields, interacting fields and Feynman diagrams, elementary processes of quantum electrodynamics, and radiative corrections.

**Part II: Renormalization**.

This part discusses the theory of renormalization and its relation to statistical mechanics, and introduces the renormalization group. It also explores the applications of renormalization to critical phenomena and scalar field theory.

**Part III: Non-Abelian Gauge Theories**.

This part presents the general framework of non-Abelian gauge theories, such as quantum chromodynamics and electroweak theory. It also covers topics such as operator products and effective vertices, perturbation theory anomalies, gauge theories with spontaneous symmetry breaking, and quantization of spontaneously broken gauge theories.

**Epilogue**.

This part summarizes the main achievements and challenges of quantum field theory, and discusses some of the open questions and frontiers of research in the field.

The book is written in a clear and pedagogical style, with carefully worked examples illustrating the technical aspects of the subject, and intuitive explanations of what is going on behind the mathematics. **An Introduction to Quantum Field Theory **book also contains many exercises and problems for students to test their understanding and practice their skills. The book is suitable for advanced undergraduate and graduate students who have some background in quantum mechanics and special relativity.

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