An Introduction to Quantum Field TheoryAn Introduction to Quantum Field Theory is a textbook intended for the graduate physics course covering relativistic quantum mechanics, quantum electrodynamics, and Feynman diagrams. The authors make these subjects accessible through carefully worked examples illustrating the technical aspects of the subject, and intuitive explanations of what is going on behind the mathematics. After presenting the basics of quantum electrodynamics, the authors discuss the theory of renormalization and its relation to statistical mechanics, and introduce the renormalization group. This discussion sets the stage for a discussion of the physical principles that underlie the fundamental interactions of elementary particle physics and their description by gauge field theories. 
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I agree with Mostafa. This book is definitely not for beginners. It is not an introduction.
If you want a solid introductory text, find a copy of Schweber.
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errata online:
http://www.slac.stanford.edu/~mpeskin/QFT.html
Contents
Pair Production in ete Annihilation  3 
The KleinGordon Field  13 
The Dirac Field  35 
Elementary Processes of Quantum Electrodynamics  131 
Introduction  175 
Some Formal Developments  211 
Radiation of Gluon Jets  259 
Ultraviolet Cutoffs and Critical Fluctuations  265 
Quantization of NonAbelian Gauge Theories  505 
Quantum Chromodynamics  547 
Operator Products and Effective Vertices  599 
Relation to the AltarelliParisi Equations  643 
Perturbation Theory Anomalies  651 
Gauge Theories with Spontaneous Symmetry Breaking  689 
Quantization of Spontaneously Broken Gauge Theories  731 
Decays of the Higgs Boson  775 
Systematics of Renormalization  315 
Renormalization and Symmetry  347 
The Renormalization Group  393 
Critical Exponents and Scalar Field Theory  439 
The ColemanWeinberg Potential  469 
NonAbelian Gauge Invariance  481 
Quantum Field Theory at the Frontier  781 
Reference Formulae  801 
Cross Sections and Decay Rates  808 
These sections may be omitted in a oneyear course emphasizing the less formal  814 
Other editions  View all
An Introduction To Quantum Field Theory, Student Economy Edition Michael Peskin Limited preview  2018 
Common terms and phrases
additional amplitude analysis becomes boson calculation called cancel Chapter charge coefficient complete compute condition consider contains contribution corrections corresponding counterterm coupling coupling constant cross section define dependence derivative determined diagrams dimensions Dirac discussion divergent effective electron energy equation evaluate example expectation expression external factor fermion Feynman final formalism formula function gauge gauge boson gauge theory given gives identity integral interactions invariant involving Lagrangian leading limit mass matrix momentum Note obtain operator parameters particles perturbation photon physical polarization possible predictions problem propagator quantity quantum field theory quantum mechanics quark relation renormalization representation result rules scalar field scale scattering shown simple ſº symmetry tion transformation vacuum vector vertex weak write zero