FeynmanExercise - two electrons and an anti-electron. Hint:...

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28Feb ISP209 Spring 2008 Exercise on Feynman Diagrams Particles: Symbol - particle Charge (units of e) Baryon Number Lepton Number u – up quark +2/3 1/3 0 d – down quark -1/3 1/3 0 e – electron -1 0 1 ν e - neutrino 0 0 1 Force Carriers (Bosons): Symbol - particle Charge (units of e) Force Carried Mass γ - photon 0 Electromagnetic 0 g - gluon 0 Strong 0 W+ 1 Weak large W -1 Weak large Z 0 Weak large Question 1: What is meant by ē ? a) anti-electron with a charge of +1 b) anti-electron with a charge of -1 c) proton d) neutron e) pion f) none of these is correct Note: We use time as vertical in our diagrams Question 2: What process is described by the following Feynman Diagram? A) Creation of an electron and anti-electron by a photon B) Scattering of an electron by an anti-electron C) Scattering of two electrons by the EM force D) Creation of a quark by the strong force E) None of these is correct Question 3: Is it possible for a down quark and an anti-down quark to interact to produce
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Unformatted text preview: two electrons and an anti-electron. Hint: Check that the charge, lepton number, and baryon number are conserved A) Yes B) No Question 4: What does the following diagram show? A). Electrons interacting by the weak force B). Electrons and quarks interacting by the strong force C). An electron and anti-electron annihilating, leading to the creation of a quark and anti-quark. D). An electromagnetic interaction of electrons and quarks E). A gluon creating a photon and anti-photon. Extra Credit: A Positive Pion (charge +e) is a particle made up of a up and an anti-down quark. Pions decay by the weak force, that is the two quarks can interact by the weak force. Is the follow diagram a possible representation of that process? A). YES B) NO Check that the charge, lepton number, and baryon number are the same before and after...
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This note was uploaded on 07/25/2008 for the course ISP 209 taught by Professor Sherrill during the Spring '07 term at Michigan State University.

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FeynmanExercise - two electrons and an anti-electron. Hint:...

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