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Comparison of ME-MC Models for W, Z, and DY Processes in Particle Physics

This study presents a comprehensive comparison of various Matrix Element - Monte Carlo (ME-MC) models used in simulating W, Z, and Drell-Yan (DY) processes. Inputs from ALPGEN, GRAPPA, and MadGraph are analyzed, focusing on generated processes with varying jet multiplicities. The results indicate agreement between GRAPPA and ALPGEN for lower jet counts, while discrepancies arise for higher multiplicities. We aim to understand the differences between ME-MC models, assessing subprocess contributions and kinematic distributions, while also planning for future improvements through communication with authors and further process generation.

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Comparison of ME-MC Models for W, Z, and DY Processes in Particle Physics

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  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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