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Standardized Comparison of ME generators

A standardized comparison of different Monte Carlo event generators, including ALPGEN, MadGraph, GR@PPA, CompHEP, and MCFM, for various processes like W/Z + jets. The analysis defines common inputs, cuts, and processes to evaluate code improvements, user interfaces, and bug detection.

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Standardized Comparison of ME generators

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  1. Standardized Comparison of ME generators Gervasio Gómez Instituto de Física de Cantabria / CSIC IPPP MC Workshop. Durham, January 2003

  2. Motivation • Several ME generators available: • ALPGEN, MadGraph, GR@PPA, CompHEP, MCFM, others • Many processes including W/Z + light or heavy jet-partons • Define a common set of inputs, cuts and processes to make comparisons • Useful • Authors get feedback from users • Improvements in code • Better user interfaces • Implementation of new processes • Good way to determine if there are bugs • Agreement a trust

  3. “comparison” ME inputs

  4. “comparison” ME inputs 2

  5. “comparison” cuts • Charged leptons • Z/g* only, l+l- pairs: 50<mll<200 GeV • No other cuts • Neutrinos • No cuts • Jet-partons • PT > 10 GeV • |h| < 2.5 • Separation between particles/partons • jj: DRJJ > 0.4 (j=jet parton) • jl, ll: no cut in DR (l=any lepton)

  6. s(W+jets) (pb)

  7. s(Z+jets) (pb)

  8. s(Wbb+jets) (fb)

  9. s(Zbb+jets) (fb)

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