FeynmanExercise

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

This preview shows pages 1–2. Sign up to view the full content.

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

This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document
This is the end of the preview. Sign up to access the rest of the document.

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...
View Full Document

## 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.

### Page1 / 2

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

This preview shows document pages 1 - 2. Sign up to view the full document.

View Full Document
Ask a homework question - tutors are online