Simulation

CMS Fast Simulation

  • Recipe. Note: if you get errors with the "cvs" command, see my comments about cvs in this page.
cmsrel CMSSW_5_3_6
cd CMSSW_5_3_6/src
cmsenv
cvs co Configuration/GenProduction/python/EightTeV/Hadronizer_TuneZ2star_8TeV_generic_LHE_pythia_tauola_cff.py
scram b

  • We will use the cmsDriver.py script. You can get more information about the options using the help option:
cmsDriver.py --help
cmsDriver.py Configuration/GenProduction/python/EightTeV/Hadronizer_TuneZ2star_8TeV_generic_LHE_pythia_tauola_cff.py --step GEN,SIM --beamspot Realistic8TeVCollision --conditions START52_V9::All --pileup NoPileUp --datamix NODATAMIXER --eventcontent RAWSIM --datatier GEN-SIM --filein=file:lhe/tttt_unweighted_events.lhe -n 20 * Run GEN and FASTSIM (detector simulation):
cmsDriver.py Configuration/GenProduction/python/EightTeV/Hadronizer_TuneZ2star_8TeV_generic_LHE_pythia_tauola_cff.py --filein=file:lhe/tttt_unweighted_events.lhe
-s GEN,FASTSIM,HLT:5E33v4 --conditions=auto:startup_5E33v4 --beamspot Realistic8TeVCollision --pileup 2012_Startup_inTimeOnly --datatier AODSIM --eventcontent AODSIM -n 20 
* Check content of the EDM output file. Notice that below is just an example! the list is incomplete.
edmDumpEventContent ../../../Hadronizer_TuneZ2star_8TeV_generic_LHE_pythia_tauola_cff_py_GEN_SIM.root 
Type                           Module                      Label             Process   
---------------------------------------------------------------------------------------
LHEEventProduct                "source"                    ""                "SIM"     
edm::RandomEngineStates        "randomEngineStateProducer"   ""                "SIM"     
edm::TriggerResults            "TriggerResults"            ""                
vector                    "genParticles"              ""                "SIM"     
vector           "ak5GenJets"                ""                "SIM"     
vector           "ak7GenJets"                ""                "SIM"     
vector           "iterativeCone5GenJets"     ""                "SIM"     
vector           "kt4GenJets"                ""                "SIM"     
vector           "kt6GenJets"                ""                "SIM"     
vector           "genMetCalo"                ""                "SIM"     
vector           "genMetCaloAndNonPrompt"    ""                "SIM"     
vector           "genMetTrue"                ""                "SIM"     
vector      "genParticles"              ""                "SIM"     
---++ Analyzing the output ROOT file from FastSim * Below is a template python script to loop over events and produce a simple histogram:
cvs co UserCode/Yumiceva/Scripts
cd UserCode/Yumiceva/Scripts
python GenParticleAnalyzer.py -i 
* The generator particle data is stored in the root file as a collection of GenParticles. This object is part of the HEP MC Event record. More information about the member functions are [[http://lcgapp.cern.ch/project/simu/HepMC/][here]], and below is snapshot of these functions. Screen_Shot_2013-03-17_at_10.25.16_PM.png
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Topic revision: r2 - 2013-03-19 - FranciscoYumiceva
 
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