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MadGraph

Introducing II. MadGraph. +. Automated Tree-Level Feynman Diagram and Helicity Amplitude Generation. Outline. What is MadGraph? What’s New in MadGraph II? Why use MadGraph? Example: Top production at FNAL Future Plans. What is MadGraph?.

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MadGraph

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  1. Introducing II MadGraph + Automated Tree-Level Feynman Diagram and Helicity Amplitude Generation

  2. Outline • What is MadGraph? • What’s New in MadGraph II? • Why use MadGraph? • Example: Top production at FNAL • Future Plans

  3. What is MadGraph? • Fortran computer program that: • Generates fortran helicity code (HELAS) to calculate tree level matrix elements • Includes color/symmetry factors • Creates postscript file of Feynman diagrams.

  4. What’s New in MadGraph II? • User defined models • Standard Model • MSSM • Unlimited external particles • Within reason! (12?) • Color Flow Information • Helps interface with HERWIG/PYTHIA • Required/Excluded particles • uu~ > W+ W- b b~ g • uu~ > tt~ >W+ W- b b~ g // Z

  5. Why use MadGraph? ………NOT • User interface • Powerful (Lots of diagrams/external particles) • Relatively fast • Amplitude generation • Matrix element evaluation a N not N2 • Keeps Spin Information • Easy to add decay chains

  6. Top Pairs at Fermilab • Signal uu~ > tt~ > e+ ve b e- ve~ b~ • Background: uu~ > e+ ve b e- ve~ b~ • Radiation: uu~ > tt~ > e+ ve b e- ve~ b~ g

  7. Signal (1)uu~ > tt~ > e+ ve b e- ve~ b~

  8. Background (66) Feynman Diagrams

  9. Signal+Radiation (7)

  10. Future of MadGraph • Tell me what you want! • Improved Interface • User • PYTHIA/HERWIG • Integration • Improved Speed

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