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MadGraph + MadEvent

MadGraph + MadEvent. +. Automated Tree-Level Feynman Diagram, Helicity Amplitude, and Event Generation. Tim Stelzer Fabio Maltoni. Outline. What is MadGraph? What’s New in MadGraph II? Example: W+ 3 jets FNAL What is MadEvent? Capability Future. What is MadGraph?.

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MadGraph + MadEvent

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  1. MadGraph + MadEvent + Automated Tree-Level Feynman Diagram, Helicity Amplitude, and Event Generation Tim Stelzer Fabio Maltoni

  2. Outline • What is MadGraph? • What’s New in MadGraph II? • Example: W+ 3 jets FNAL • What is MadEvent? • Capability • Future

  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. New in MadGraph II! • User defined models • Standard Model • MSSM • Unlimited external particles • Within reason! (12?) • Color Flow Information • Helps interface with HERWIG/PYTHIA • Jets + Required/Excluded particles • pp ~ > W+ W- b b~ j • pp~ > tt~ >W+ W- b b~ j // Z • Phase Space Information

  5. PP → W+ 3 jets • Enter Process: pp > e+ ve jjj • Enter QCD Order: 4 • Enter QED Order: 2 (…… wait 2 minutes) • Generated 53 sub processes

  6. What is MadEvent? • Fortran computer program that: • Uses output from MadGraph • Generates • Cross sections • Events (Les Houche format) • W+ 3 jets: • First 10,000 unweighted events about 30 minutes.

  7. Examples:Vector Bosons

  8. Examples: Heavy Quarks

  9. What about W+8 jets? • Current Limitations • PP -> W+ 5 jets (1 week) • 9999 diagrams (1000 is nice) • 10 external particles (8 is easy) • 7 summed particles (protons/jets) • Future Improvements • Housekeeping • Phase Space (factor of 10 in speed!)

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