text: # Different initial state: electron - positron collider
  
  import FWCore.ParameterSet.Config as cms
  
  process = cms.Process("PROD")
  
  process.load("Configuration.StandardSequences.SimulationRandomNumberGeneratorSeeds_cff")
  
  process.source = cms.Source("EmptySource")
  
  process.generator = cms.EDFilter("Pythia8GeneratorFilter",
      maxEventsToPrint = cms.untracked.int32(1),
      pythiaPylistVerbosity = cms.untracked.int32(1),
      filterEfficiency = cms.untracked.double(1.0),
      pythiaHepMCVerbosity = cms.untracked.bool(False),
      comEnergy = cms.double(7000.),
      #PPbarInitialState  = cms.PSet(),
      ElectronPositronInitialState  = cms.PSet(),
      PythiaParameters = cms.PSet(
          pythia8_example06 = cms.vstring('WeakSingleBoson:ffbar2gmZ = on'),
          parameterSets = cms.vstring('pythia8_example06')
      )
  )
  
  process.load("FWCore.MessageLogger.MessageLogger_cfi")
  process.MessageLogger = cms.Service("MessageLogger",
      cerr = cms.untracked.PSet(
          enable = cms.untracked.bool(False)
      ),
      cout = cms.untracked.PSet(
          default = cms.untracked.PSet(
              limit = cms.untracked.int32(2)
          ),
          enable = cms.untracked.bool(True)
      )
  )
  
  process.RandomNumberGeneratorService = cms.Service("RandomNumberGeneratorService",
      generator = cms.PSet(
          initialSeed = cms.untracked.uint32(123456789),
      )
  )
  
  process.maxEvents = cms.untracked.PSet(
      input = cms.untracked.int32(10)
  )
  
  process.GEN = cms.OutputModule("PoolOutputModule",
      fileName = cms.untracked.string('pythia8ex6.root')
  )
  
  process.p = cms.Path(process.generator)
  process.outpath = cms.EndPath(process.GEN)
  
  process.schedule = cms.Schedule(process.p, process.outpath)
  
  