FullSimWithCTPPS_cff.py

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import FWCore.ParameterSet.Config as cms
def customise(process):

    if hasattr(process.VtxSmeared,"X0"):
           VertexX = process.VtxSmeared.X0
           VertexY = process.VtxSmeared.Y0
           VertexZ = process.VtxSmeared.Z0

        if hasattr(process.VtxSmeared,"MeanX"):
           VertexX = process.VtxSmeared.MeanX
           VertexY = process.VtxSmeared.MeanY
           VertexZ = process.VtxSmeared.MeanZ

    process.load("SimG4Core.Application.g4SimHits_cfi")
    process.g4SimHits.Generator.HepMCProductLabel   = 'LHCTransport'
    process.g4SimHits.Generator.MinEtaCut        = -13.0
    process.g4SimHits.Generator.MaxEtaCut        = 13.0

    process.g4SimHits.SteppingAction.MaxTrackTime = cms.double(2000.0)
    process.g4SimHits.StackingAction.MaxTrackTime = cms.double(2000.0)

    process.load('SimTransport.HectorProducer.HectorTransportCTPPS_cfi')
    process.LHCTransport.CTPPSHector.VtxMeanX  = VertexX
        process.LHCTransport.CTPPSHector.VtxMeanY  = VertexY
    process.LHCTransport.CTPPSHector.VtxMeanZ  = VertexZ
    
    process.transport_step = cms.Path(process.LHCTransport)
    process.psim = cms.Sequence(cms.SequencePlaceholder("randomEngineStateProducer")*process.LHCTransport*process.g4SimHits)

    return(process)