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Unformatted text preview: Lecture 22: The Particle Zoo I. Overview: Elementary Particles A. Smallest units of matter (and energy) II. Anti-matter A. Paul Dirac (1928) developed a system which combined Quantum Mechanics and Relativity (Relativistic Quantum Mechanics) 1. found that for every positive energy level there is an opposite negative level 2. infinite number of electrons everywhere 3. Can excite a negative energy electron to positive energy and create a hole that has the same properties as an electron except for a positive charge B. Positron discovered (1932) C. Every particle has a corresponding anti-particle 1. when these come in contact with each other they will annihilate each other and emit high energy photons III. Particle Classifications A. Before 1. neutron with no momentum B. After 1. proton and electron up and to the right 2. momentum is not conserved C. In order to fix, there must be a missing particle the neutrino D. Families of Particles 1. Leptons composed of electron (e- ), muon (...
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