The PYTHIA 8 event generator is implemented as a module in the standard CMSSW 3.1.1 installation. PYTHIA8 uses parameters different from PYTHIA6, but otherwise the EDFilter works the same.
Example cfi files for simulation of single diffractive, double diffractive and non-diffractive minimum bias reside in /castor/cern.ch/user/j/jwelti/Pythia8 (will be uploaded to SVN after some testing). These can be used together with the standard configurations for PYTHIA 6 in /afs/cern.ch/exp/totem/scratch/Release/validation/rel3.4.production90m/workspace/input/production . Put the PYTHIA8 cfi in Configuration/TotemCommon/python in your CMSSW workspace and replace process.load("Configuration.TotemCommon.PythiaSD_cfi") in your CMSSW configuration py-file with process.load("Configuration.TotemCommon.Pythia8SD_cfi") .
Now you can generate events with PYTHIA 8!
-- JanWelti - 28-Apr-2011
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