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

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

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