1 / 9

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?.

zonta
Download Presentation

MadGraph + MadEvent

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  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!)

More Related