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Comparison of Standard Inputs for Generated Processes in MC Analysis

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This study compares ALPGEN, GRAPPA, and MadGraph inputs for W, Z, DY, Wbb, Zbb, DYbb processes with varying jet counts. Summary of results shows agreement and discrepancies, highlighting need for further analysis.

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Comparison of Standard Inputs for Generated Processes in MC Analysis

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Presentation Transcript

  1. ME-MC comparison • Standard Inputs so far • ALPGEN • GRAPPA • MadGraph • Generated processes • ALPGEN (xs by mlm) • W,Z,DY + nj, n=0..5 • Wbb,Zbb,DYbb + nj, n=0..3 • GRAPPA • W,Z + nj, n=0..2 • W+3j available, xs by S. Tsuno • Wbb + 0j, xs by S. Tsuno • MadGraph • W,Z + nj, n=0..3 • Wbb,Zbb + nj, n=0..1

  2. Summary of Results • W+n jets • MG<AL by (0.5,3,5,6) % n=0..3 • GR & AL agree • Z+n jets • Everything ~OK • Wbb+n jets • MG>AL by (6, 2) % n=0..1 • GR & AL agree for n=0 • Zbb+n jets • MG>AL by (8, 6) % n=0..1

  3. Conclusions • Need to understand differences between ME-MCs • Study relative fractions by subprocesses • Compare kinematic distributions • Communication with authors • Work in progress • Generate remaining processes • CompHEP tunning • Shower -> Ntuples->kinematic distributions • Get NLO rates from MCFM

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