/data/doxygen/doxygen-1.7.3/gen/CMSSW_4_2_8/src/RecoEgamma/EgammaPhotonProducers/python/conversionTrackSequenceForReReco_cff.py

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import FWCore.ParameterSet.Config as cms

import RecoEgamma.EgammaPhotonProducers.conversionTrackProducer_cfi
import RecoEgamma.EgammaPhotonProducers.conversionTrackMerger_cfi

# Conversion Track candidate producer 
from RecoEgamma.EgammaPhotonProducers.conversionTrackCandidates_cfi import *
# Conversion Track producer  ( final fit )
from RecoEgamma.EgammaPhotonProducers.ckfOutInTracksFromConversions_cfi import *
from RecoEgamma.EgammaPhotonProducers.ckfInOutTracksFromConversions_cfi import *
ckfTracksFromConversionsReReco = cms.Sequence(conversionTrackCandidates*ckfOutInTracksFromConversions*ckfInOutTracksFromConversions)


#producer from general tracks collection, set tracker only and merged arbitrated flag
generalConversionTrackProducerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackProducer_cfi.conversionTrackProducer.clone(
    TrackProducer = cms.string('generalTracks'),
    setTrackerOnly = cms.bool(True),
    useTrajectory = cms.bool(False),
)

#producer from inout ecal seeded tracks, set arbitratedecalseeded and mergedarbitrated flags
inOutConversionTrackProducerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackProducer_cfi.conversionTrackProducer.clone(
    TrackProducer = cms.string('ckfInOutTracksFromConversions'),
    setArbitratedEcalSeeded = cms.bool(True),
    useTrajectory = cms.bool(False), 
)

#producer from outin ecal seeded tracks, set arbitratedecalseeded and mergedarbitrated flags
outInConversionTrackProducerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackProducer_cfi.conversionTrackProducer.clone(
    TrackProducer = cms.string('ckfOutInTracksFromConversions'),
    setArbitratedEcalSeeded = cms.bool(True),
    useTrajectory = cms.bool(False),
)

#producer from gsf tracks, set only mergedarbitrated flag (default behaviour)
gsfConversionTrackProducerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackProducer_cfi.conversionTrackProducer.clone(
    TrackProducer = cms.string('electronGsfTracks'),
    useTrajectory = cms.bool(False),
)

conversionTrackProducersReReco = cms.Sequence(generalConversionTrackProducerReReco*inOutConversionTrackProducerReReco*outInConversionTrackProducerReReco*gsfConversionTrackProducerReReco)

#merge two ecal-seeded collections, with arbitration by nhits then chi^2/ndof for both ecalseededarbitrated and mergedarbitrated flags
inOutOutInConversionTrackMergerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackMerger_cfi.conversionTrackMerger.clone(
    TrackProducer1 = cms.string('inOutConversionTrackProducerReReco'),
    TrackProducer2 = cms.string('outInConversionTrackProducerReReco'),
    #prefer collection settings:
    #-1: propagate output/flag from both input collections
    # 0: propagate output/flag from neither input collection
    # 1: arbitrate output/flag (remove duplicates by shared hits), give precedence to first input collection
    # 2: arbitrate output/flag (remove duplicates by shared hits), give precedence to second input collection
    # 3: arbitrate output/flag (remove duplicates by shared hits), arbitration first by number of hits, second by chisq/ndof  
    arbitratedEcalSeededPreferCollection = cms.int32(3),    
    arbitratedMergedPreferCollection = cms.int32(3),
)

#merge ecalseeded collections with collection from general tracks
#trackeronly flag is forwarded from the generaltrack-based collections
#ecalseeded flag is forwarded from the ecal seeded collection
#arbitratedmerged flag is set based on shared hit matching, arbitration by nhits then chi^2/ndof
generalInOutOutInConversionTrackMergerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackMerger_cfi.conversionTrackMerger.clone(
    TrackProducer1 = cms.string('inOutOutInConversionTrackMergerReReco'),
    TrackProducer2 = cms.string('generalConversionTrackProducerReReco'),
    arbitratedMergedPreferCollection = cms.int32(3),
)

#merge the result of the above with the collection from gsf tracks
#trackeronly and mergedecal flags are forwarded
#arbitratedmerged flag set based on overlap removal by shared hits, with precedence given to gsf tracks
gsfGeneralInOutOutInConversionTrackMergerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackMerger_cfi.conversionTrackMerger.clone(
    TrackProducer1 = cms.string('generalInOutOutInConversionTrackMergerReReco'),
    TrackProducer2 = cms.string('gsfConversionTrackProducerReReco'),
    arbitratedMergedPreferCollection = cms.int32(2),
)

#final output collection contains combination of generaltracks, ecal seeded tracks and gsf tracks, with overlaps removed by shared hits
#precedence is given first to gsf tracks, then to the combination of ecal seeded and general tracks
#overlaps between the ecal seeded track collections and between ecal seeded and general tracks are arbitrated first by nhits then by chi^2/dof
#(logic and much of the code is adapted from FinalTrackSelectors)

conversionTrackMergersReReco = cms.Sequence(inOutOutInConversionTrackMergerReReco*generalInOutOutInConversionTrackMergerReReco*gsfGeneralInOutOutInConversionTrackMergerReReco)

conversionTrackSequenceForReReco = cms.Sequence(ckfTracksFromConversionsReReco*conversionTrackProducersReReco*conversionTrackMergersReReco)

#merge the general tracks with the collection from gsf tracks
#arbitratedmerged flag set based on overlap removal by shared hits, with precedence given to gsf tracks
gsfGeneralConversionTrackMergerReReco = RecoEgamma.EgammaPhotonProducers.conversionTrackMerger_cfi.conversionTrackMerger.clone(
    TrackProducer1 = cms.string('generalConversionTrackProducerReReco'),
    TrackProducer2 = cms.string('gsfConversionTrackProducerReReco'),
    arbitratedMergedPreferCollection = cms.int32(2),
)

#conversionTrackSequenceNoEcalSeeded = cms.Sequence(generalConversionTrackProducer*gsfConversionTrackProducer*gsfGeneralConversionTrackMerger)