Quantum Field Theory

Following on from the successful first (1984) and revised (1993) editions, this extended and revised text is designed as a short and simple introduction to quantum field theory for final year physics students and for postgraduate students beginning research in theoretical and experimental particle physics.
The three main objectives of the book are to:
Explain the basic physics and formalism of quantum field theory
To make the reader proficient in theory calculations using Feynman diagrams
To introduce the reader to gauge theories, which play a central role in elementary particle physics.
Thus, the first ten chapters deal with QED in the canonical formalism, and are little changed from the first edition. A brief introduction to gauge theories (Chapter 11) is then followed by two sections, which may be read independently of each other. They cover QCD and related topics (Chapters 12–15) and the unified electroweak theory (Chapters 16 – 19) respectively. Problems are provided at the end of each chapter.
New to this edition:
Five new chapters, giving an introduction to quantum chromodynamics and the methods used to understand it: in particular, path integrals and the renormalization group.
The treatment of electroweak interactions has been revised and updated to take account of more recent experiments.


Spis treści:
Dedication
Preface
1 Photons and the Electromagnetic Field
1.1 Particles and Fields
1.2 The Electromagnetic Field in the Absence of Charges
1.3 The Electric Dipole Interaction
1.4 The Electromagnetic Field in the Presence of Charges
1.5 Appendix: The Schrödinger, Heisenberg and Interaction Pictures
Problems
2 Lagrangian Field Theory
2.1 Relativistic Notation
2.2 Classical Lagrangian Field Theory
2.3 Quantized Lagrangian Field Theory
2.4 Symmetries and Conservation Laws
Problems
3 The Klein–Gordon field
3.1 The Real Klein–Gordon Field< br>3.2 The Complex Klein–Gordon Field
3.3 Covariant Commutation Relations
3.4 The Meson Propagator
Problems
4 The Dirac Field
4.1 The Number Representation for Fermions
4.2 The Dirac Equation
4.3 Second Quantization
4.4 The Fermion Propagator
4.5 The Electromagnetic Interaction and Gauge Invariance
Problems
5 Photons: Covariant Theory
5.1 The Classical Fields
5.2 Covariant Quantization
5.3 The Photon Propagator
Problems
6 The S–Matrix Expansion
6.1 Natural Dimensions and Units
6.2 The S–Matrix Expansion
6.3 Wick’s Theorem
7 Feynman Diagrams and Rules in QED
7.1 Feynman Diagrams in Configuration Space
7.2 Feynman Diagrams in Momentum Space
7.3 Feynman Rules for QED
7.4 Leptons
Problems
8 QED Processes in Lowest Order
8.1 The Cross–Section
8.2 Spin Sums
8.3 Photon Polarization Sums
8.4 Lepton Pair Production in (eþe—) Collisions
8.5 Bhabha Scattering
8.6 Compton Scattering
8.7 Scattering by an External Field
8.8 Bremsstrahlung
8.9 The Infra–Red Divergence
Problems
9 Radiative Corrections
9.1 The Second–Order Radiative Corrections of QED
9.2 The Photon Self–Energy
9.3 The Electron Self–Energy
9.4 External Line Renormalization
9.5 The Vertex Modification
9.6 Applications
9.7 The Infra–Red Divergence
9.8 Higher–Order Radiative Corrections
9.9 Renomalizability
Problems
10 Regularization
10.1 Mathematical Preliminaries
10.2 Cut–Off Regularization: The Electron Mass Shift
10.3 Dimensional Regularization
10.4 Vacuum Polarization
10.5 The Anomalous Magnetic Moment
Problems
11 Gauge Theories
11.1 The Simplest Gauge Theory: QED
11.2 Quantum Chromodynamics
11.3 Alternative Interactions?
11.4 Appendix: Two Gauge Transformation Results
Problems
12 Field Theory Methods
12.1 Green Functions
12.2 Feynman Diagrams an d Feynman Rules
12.3 Relation to S–Matrix Elements
12.4 Functionals and Grassmann Fields
12.5 The Generating Functional
Problems
13 Path Integrals
13.1 Functional Integration
13.2 Path Integrals
13.3 Perturbation Theory
13.4 Gauge Independent Quantization?
Problems
14 Quantum Chromodynamics
14.1 Gluon Fields
14.2 Including Quarks
14.3 Perturbation Theory
14.4 Feynman Rules for QCD
14.5 Renormalizability of QCD
Problems
15 Asymptotic Freedom
15.1 Electron–Positron Annihilation
15.2 The Renormalization Scheme
15.3 The Renormalization Group
15.4 The Strong Coupling Constant
15.5 Applications
15.6 Appendix: Some Loop Diagrams in QCD
Problems
16 Weak Interactions
16.1 Introduction
16.2 Leptonic Weak Interactions
16.3 The Free Vector Boson Field
16.4 The Feynman Rules for the IVB Theory
16.5 Decay Rates
16.6 Applications of the IVB Theory
16.7 Neutrino Masses
16.8 Difficulties with the IVB Theory
Problems
17 A Gauge Theory of Weak Interactions
17.1 QED Revisited
17.2 Global Phase Transformations and Conserved Weak Currents
17.3 The Gauge–Invariant Electro–Weak Interaction
17.4 Properties of the Gauge Bosons
17.5 Lepton and Gauge Boson Masses
18 Spontaneous Symmetry Breaking
18.1 The Goldstone Model
18.2 The Higgs Model
18.3 The Standard Electro–Weak Theory
19 The Standard Electro–weak Theory
19.1 The Lagrangian Density in the Unitary Gauge
19.2 Feynman Rules
19.3 Elastic Neutrino–Electron Scattering
19.4 Electron–Positron Annihilation
19.5 The Higgs Boson
Problems
Appendix A
Appendix B
Index

Okładka tylna:
Following on from the successful first (1984) and revised (1993) editions, this extended and revised text is designed as a short and simple introduction to quantum field theory for final year physics students and for postgraduate students beginning research in theoretical and experimental particle physics.
The three main objectives of the book are to:
Explain the basic physics and formalism of quantum field theory
To make the reader proficient in theory calculations using Feynman diagrams
To introduce the reader to gauge theories, which play a central role in elementary particle physics.
Thus, the first ten chapters deal with QED in the canonical formalism, and are little changed from the first edition. A brief introduction to gauge theories (Chapter 11) is then followed by two sections, which may be read independently of each other. They cover QCD and related topics (Chapters 12–15) and the unified electroweak theory (Chapters 16 – 19) respectively. Problems are provided at the end of each chapter.
New to this edition:
Five new chapters, giving an introduction to quantum chromodynamics and the methods used to understand it: in particular, path integrals and the renormalization group.
The treatment of electroweak interactions has been revised and updated to take account of more recent experiments.