cms.EDProducer("TrackAssociatorEDProducer",\ 
    associator = cms.InputTag("hltTrackAssociatorByHits"),\ 
    ignoremissingtrackcollection = cms.untracked.bool(True),\ 
    label_tp = cms.InputTag("mix","MergedTrackTruth"),\ 
    label_tr = cms.InputTag("hltGeneralTracks")\ 
)\