Some validation of MC@NLO, AlpGen and TopRex. Stan Bentvelsen Feb 18 th , 2004. Resume of MC@NLO. MC@NLO: Matching NLO calculations of QCD process with parton shower MC simulation Fully exclusive events generated Hard emissions treated as in NLO Soft emissions handled by MC shower (Herwig)
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Feb 18th, 2004
‘standard’ tt production
tt production cross section
MCatNLO: 842 pb
HERWIG: 458 pb
PYTHIA: 490 pb
(nb: no consistent pdf’s!)
Same distribution on linear scale
All distributions normalised to 1
Example run in AlpGen
Use local NIKHEF LCG grid
Currently 30% of total LCG grid
This will change soon
Total 240 CPU’s
Mix of PIII: 0.8, 1.2, 2.0 and 2.6 GHz machinesNIKHEF data processing facility
AlpGen jobs take lot of CPU
AlpGen jobs running!
Can we have this available for DC2 ??
<CosΘ+ · CosΘ->
Logistics of externally generated event files