## Introduction to Elementary ParticlesThis is the first quantitative treatment of elementary particle theory that is accessible to undergraduates. Using a lively, informal writing style, the author strikes a balance between quantitative rigor and intuitive understanding. The first chapter provides a detailed historical introduction to the subject. Subsequent chapters offer a consistent and modern presentation, covering the quark model, Feynman diagrams, quantum electrodynamics, and gauge theories. A clear introduction to the Feynman rules, using a simple model, helps readers learn the calculational techniques without the complications of spin. And an accessible treatment of QED shows how to evaluate tree-level diagrams. Contains an abundance of worked examples and many end-of-chapter problems. |

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### Contents

1 | |

11 | |

2 Elementary Particle Dynamics | 55 |

3 Relativistic Kinematics | 81 |

4 Symmetries | 103 |

5 Bound States | 143 |

6 The Feynman Calculus | 189 |

7 Quantum Electrodynamics | 213 |

9 Quantum Chromodynamics | 279 |

10 Weak Interactions | 301 |

11 Gauge Theories | 343 |

APPENDIX A The Dirac Delta Function | 372 |

APPENDIX B Decay Rates and Cross Sections | 376 |

APPENDIX C Pauli and Dirac Matrices | 378 |

APPENDIX D Feynman Rules | 380 |

384 | |

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### Common terms and phrases

amplitude angular momentum antiparticle antiquark antisymmetric atom baryon beta decay calculate carry Chapter charge chromodynamics classical collision color singlet combination components conﬁguration conﬁrm coupling constant cross section decay rate decuplet deﬁne delta function Derive equation Dirac equation eigenstates electrodynamics electromagnetic electron elementary particle physics energy and momentum example experimental fact fermion Feynman diagrams Feynman rules Figure ﬁnal ﬁnd ﬁne structure ﬁrst ﬂavor force formula four-vector gauge ﬁelds gauge transformations gluons hadrons hence hydrogen inﬁnite integral isospin kinetic energy Lagrangian leptons Lett lifetime Lorentz magnetic mass massless matrix mediated mesons momenta muon neutral neutrino neutron nonrelativistic notation octet outgoing parity Phys pion polarization positron positronium potential Problem proton quantum mechanics quark model relativistic scalar scattering Scientiﬁc spin spinor strong interactions Suppose symmetry triplet vector velocity vertex factor wave function weak interactions zero