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Lecture.1.part1 - Physics 357/457 Physics 357/457 Spring...

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Unformatted text preview: Physics 357/457 Physics 357/457 Spring 2011 Spring 2011 (Chapter 1: getting started) (Chapter 1: getting started) e lementary articles the elementary particles the forces the model how can we understand it? Elementary particle: Elementary particle: an entity not able to be further decomposed an entity not able to be further decomposed with a unique set of properties with a unique set of properties mass, m harge Q charge, Q spin : s =½ integer ( fermion ), s = 0, 1, 2…( boson ) flavor pin, charge & mass(energy) spin, charge & mass(energy) Intrinsic property “ constituents ” do not exist We don’t know how to account for the property by classical, quantum mechanical or relativistic (field theoretic) models what is charge? what is charge? at s c a ge at s c a ge Charge (Q) is a quantity we have defined in order to describe how certain particles (with this charge) interact. If the particles don’t interact in the prescribed way, they don’t have charge.interact in the prescribed way, they don’t have charge....
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