RecoTracker/IterativeTracking/python/PixelPairStep_cff.py - master - githubmirror/cmssw

RecoTracker/IterativeTracking/python/PixelPairStep_cff.py
510 строк23 KB
Kevin Pedro
isolate phase 2 tracking changes
16 мар 2026, 21:13
16 мар 2026, 21:13bf6da84
import FWCore.ParameterSet.Config as cms
from Configuration.Eras.Modifier_tracker_apv_vfp30_2016_cff import tracker_apv_vfp30_2016 as _tracker_apv_vfp30_2016
import RecoTracker.IterativeTracking.iterativeTkConfig as _cfg
from Configuration.Eras.Modifier_fastSim_cff import fastSim

# for dnn classifier
from Configuration.ProcessModifiers.trackdnn_cff import trackdnn
from RecoTracker.IterativeTracking.dnnQualityCuts import qualityCutDictionary

# for no-loopers
from Configuration.ProcessModifiers.trackingNoLoopers_cff import trackingNoLoopers

# NEW CLUSTERS (remove previously used clusters)
pixelPairStepClusters = _cfg.clusterRemoverForIter('PixelPairStep')
for _eraName, _postfix, _era in _cfg.nonDefaultEras():
    _era.toReplaceWith(pixelPairStepClusters, _cfg.clusterRemoverForIter('PixelPairStep', _eraName, _postfix))

import RecoTracker.TkSeedingLayers.seedingLayersEDProducer_cfi as _mod

# SEEDING LAYERS
pixelPairStepSeedLayers = _mod.seedingLayersEDProducer.clone(
    layerList = ['BPix1+BPix2', 'BPix1+BPix3', 'BPix2+BPix3', 
                 'BPix1+FPix1_pos', 'BPix1+FPix1_neg', 
                 'BPix2+FPix1_pos', 'BPix2+FPix1_neg', 
                 'FPix1_pos+FPix2_pos', 'FPix1_neg+FPix2_neg'],
    BPix = dict(
        TTRHBuilder = cms.string('WithTrackAngle'),
        HitProducer = cms.string('siPixelRecHits'),
        skipClusters = cms.InputTag('pixelPairStepClusters')
    ),
    FPix = dict(
        TTRHBuilder = cms.string('WithTrackAngle'),
        HitProducer = cms.string('siPixelRecHits'),
        skipClusters = cms.InputTag('pixelPairStepClusters')
    )
)
# layers covering the region not covered by quadruplets (so it is
# just acting as backup of triplets)
_layerListForPhase1 = [
    'BPix1+BPix2', 'BPix1+BPix3', 'BPix2+BPix3',
    'BPix1+FPix1_pos', 'BPix1+FPix1_neg',
    'BPix2+FPix1_pos', 'BPix2+FPix1_neg',
]
from Configuration.Eras.Modifier_trackingPhase1_cff import trackingPhase1
trackingPhase1.toModify(pixelPairStepSeedLayers, layerList = _layerListForPhase1)

# only layers covering the region not covered by quadruplets
# (so it is just acting as backup of triplets)
_layerListForPhase2 = [
        'BPix1+BPix2', 'BPix1+BPix3', 'BPix2+BPix3',
        'BPix1+FPix1_pos', 'BPix1+FPix1_neg',
        'BPix2+FPix1_pos', 'BPix2+FPix1_neg'
]
# modifing these errors seems to make no difference
from Configuration.Eras.Modifier_trackingPhase2PU140_cff import trackingPhase2PU140
trackingPhase2PU140.toModify(pixelPairStepSeedLayers, 
    layerList = _layerListForPhase2,
    BPix = dict(
        useErrorsFromParam = cms.bool(True),
        hitErrorRPhi = cms.double(0.0016),
        hitErrorRZ   = cms.double(0.0035),
        TTRHBuilder  = 'TTRHBuilderWithoutAngle4PixelPairs',
    ),
    FPix = dict(
        useErrorsFromParam = cms.bool(True),
        hitErrorRPhi = cms.double(0.0030),
        hitErrorRZ   = cms.double(0.0020),
        TTRHBuilder  = 'TTRHBuilderWithoutAngle4PixelPairs',
    )
)

# TrackingRegion
from RecoTracker.TkTrackingRegions.globalTrackingRegionWithVertices_cff import globalTrackingRegionWithVertices as _globalTrackingRegionWithVertices
pixelPairStepTrackingRegions = _globalTrackingRegionWithVertices.clone(
    RegionPSet = dict(
        ptMin        = 0.6,
        originRadius = 0.015,
        fixedError   = 0.03,
        useMultipleScattering = True)
)
from Configuration.Eras.Modifier_trackingLowPU_cff import trackingLowPU
trackingLowPU.toModify(pixelPairStepTrackingRegions, RegionPSet=dict(useMultipleScattering=False))
_region_Phase1 = dict(
    useMultipleScattering = False,
    maxNVertices = 5,
)
trackingPhase1.toModify(pixelPairStepTrackingRegions, RegionPSet=_region_Phase1)
trackingPhase2PU140.toModify(pixelPairStepTrackingRegions, RegionPSet=_region_Phase1)
from Configuration.Eras.Modifier_highBetaStar_cff import highBetaStar
highBetaStar.toModify(pixelPairStepTrackingRegions,RegionPSet = dict(
     ptMin        = 0.05,
     originRadius = 0.2,
     fixedError   = 4.
))
from Configuration.Eras.Modifier_run3_upc_cff import run3_upc
(highBetaStar & run3_upc).toModify(pixelPairStepTrackingRegions,RegionPSet = dict(originRadius = 0.015))
fastSim.toModify(pixelPairStepTrackingRegions, RegionPSet=dict(VertexCollection = 'firstStepPrimaryVerticesBeforeMixing'))

# SEEDS
from RecoTracker.TkHitPairs.hitPairEDProducer_cfi import hitPairEDProducer as _hitPairEDProducer
pixelPairStepHitDoublets = _hitPairEDProducer.clone(
    seedingLayers         = 'pixelPairStepSeedLayers',
    trackingRegions       = 'pixelPairStepTrackingRegions',
    produceSeedingHitSets = True,
    maxElementTotal       = 12000000,
)
from RecoTracker.TkSeedGenerator.seedCreatorFromRegionConsecutiveHitsEDProducer_cff import seedCreatorFromRegionConsecutiveHitsEDProducer as _seedCreatorFromRegionConsecutiveHitsEDProducer
pixelPairStepSeeds = _seedCreatorFromRegionConsecutiveHitsEDProducer.clone(
    seedingHitSets = 'pixelPairStepHitDoublets',
    SeedComparitorPSet = dict(# FIXME: is this defined in any cfi that could be imported instead of copy-paste?
        ComponentName      = 'PixelClusterShapeSeedComparitor',
        FilterAtHelixStage = cms.bool(True),
        FilterPixelHits    = cms.bool(True),
        FilterStripHits    = cms.bool(False),
        ClusterShapeHitFilterName = cms.string('ClusterShapeHitFilter'),
        ClusterShapeCacheSrc = cms.InputTag('siPixelClusterShapeCache'),
    )
)

# Clone for the phase1 recovery mode
pixelPairStepSeedsA = pixelPairStepSeeds.clone()

#have to do it after making pixelPairStepSeedsA since pixelPairStepSeedsB clones A
# and then modifies it
import FastSimulation.Tracking.TrajectorySeedProducer_cfi
fastSim.toReplaceWith(pixelPairStepSeeds,
                      FastSimulation.Tracking.TrajectorySeedProducer_cfi.trajectorySeedProducer.clone(
        trackingRegions    = 'pixelPairStepTrackingRegions',
        hitMasks           = cms.InputTag('pixelPairStepMasks'),
        seedFinderSelector = dict(layerList = pixelPairStepSeedLayers.layerList.value())
        )
)

# Recovery for regions with 2 inactive layers
from RecoTracker.TkTrackingRegions.pixelInactiveAreaTrackingRegionsAndSeedingLayers_cfi import pixelInactiveAreaTrackingRegionsAndSeedingLayers as _pixelInactiveAreaTrackingRegionsAndSeedingLayers
pixelPairStepTrackingRegionsSeedLayersB = _pixelInactiveAreaTrackingRegionsAndSeedingLayers.clone(
    layerList = [
# Commented ones are already included in the global seeds (A), but are
# included below for completenees
#
#        'BPix1+BPix2',
#        'BPix1+BPix3',
        'BPix1+BPix4',
#        'BPix2+BPix3',
        'BPix2+BPix4',
        'BPix3+BPix4',
#        'BPix1+FPix1_pos'    , 'BPix1+FPix1_neg',
        'BPix1+FPix2_pos'    , 'BPix1+FPix2_neg',
        'BPix1+FPix3_pos'    , 'BPix1+FPix3_neg',
#        'BPix2+FPix1_pos'    , 'BPix2+FPix1_neg',
        'BPix2+FPix2_pos'    , 'BPix2+FPix2_neg',
        'BPix3+FPix1_pos'    , 'BPix3+FPix1_neg',
        'FPix1_pos+FPix2_pos', 'FPix1_neg+FPix2_neg',
        'FPix1_pos+FPix3_pos', 'FPix1_neg+FPix3_neg',
        'FPix2_pos+FPix3_pos', 'FPix2_neg+FPix3_neg',
    ],
    BPix = dict(
        TTRHBuilder  = cms.string('WithTrackAngle'),
        HitProducer  = cms.string('siPixelRecHits'),
        skipClusters = cms.InputTag('pixelPairStepClusters')
    ),
    FPix = dict(
        TTRHBuilder  = cms.string('WithTrackAngle'),
        HitProducer  = cms.string('siPixelRecHits'),
        skipClusters = cms.InputTag('pixelPairStepClusters')
    ),
    RegionPSet = dict(
        ptMin         = 0.6,
        originRadius  = 0.015,
        operationMode = 'VerticesFixed',
        zErrorVertex  = 0.03,
        maxNVertices  = 5,
    ),
    ignoreSingleFPixPanelModules = True,
)
highBetaStar.toModify(pixelPairStepTrackingRegionsSeedLayersB,RegionPSet = dict(
     ptMin        = 0.05,
     originRadius = 0.2,
))
(highBetaStar & run3_upc).toModify(pixelPairStepTrackingRegionsSeedLayersB,RegionPSet = dict(ptMin = 0.08, originRadius  = 0.015))
#include commented lines from above in pp_on_XY eras; global seeds (A) are not used in this era b/c timing
from Configuration.Eras.Modifier_pp_on_XeXe_2017_cff import pp_on_XeXe_2017
from Configuration.ProcessModifiers.pp_on_AA_cff import pp_on_AA
(pp_on_XeXe_2017 | pp_on_AA).toModify(pixelPairStepTrackingRegionsSeedLayersB, layerList = [
      'BPix1+BPix2', 'BPix1+BPix3', 'BPix1+BPix4', 'BPix2+BPix3', 'BPix2+BPix4','BPix3+BPix4',
      'BPix1+FPix1_pos'    , 'BPix1+FPix1_neg',
      'BPix1+FPix2_pos'    , 'BPix1+FPix2_neg',
      'BPix1+FPix3_pos'    , 'BPix1+FPix3_neg',
      'BPix2+FPix1_pos'    , 'BPix2+FPix1_neg',
      'BPix2+FPix2_pos'    , 'BPix2+FPix2_neg',
      'BPix3+FPix1_pos'    , 'BPix3+FPix1_neg',
      'FPix1_pos+FPix2_pos', 'FPix1_neg+FPix2_neg',
      'FPix1_pos+FPix3_pos', 'FPix1_neg+FPix3_neg',
      'FPix2_pos+FPix3_pos', 'FPix2_neg+FPix3_neg' 
   ])

pixelPairStepHitDoubletsB = pixelPairStepHitDoublets.clone(
    seedingLayers   = '',
    trackingRegions = '',
    trackingRegionsSeedingLayers = 'pixelPairStepTrackingRegionsSeedLayersB',
)
pixelPairStepSeedsB = pixelPairStepSeedsA.clone(seedingHitSets = 'pixelPairStepHitDoubletsB')


# Merge
from RecoTracker.TkSeedGenerator.GlobalCombinedSeeds_cfi import globalCombinedSeeds as _globalCombinedSeeds
_pixelPairStepSeedsMerged = _globalCombinedSeeds.clone(
    seedCollections = ['pixelPairStepSeedsA', 'pixelPairStepSeedsB'],
)
(trackingPhase1 & ~fastSim).toReplaceWith(pixelPairStepSeeds, _pixelPairStepSeedsMerged)

#only use region B for pp_on_XY era for timing reasons
(pp_on_XeXe_2017 | pp_on_AA).toReplaceWith(pixelPairStepSeeds, pixelPairStepSeedsB)

# QUALITY CUTS DURING TRACK BUILDING
import TrackingTools.TrajectoryFiltering.TrajectoryFilter_cff
_pixelPairStepTrajectoryFilterBase = TrackingTools.TrajectoryFiltering.TrajectoryFilter_cff.CkfBaseTrajectoryFilter_block.clone(
    minimumNumberOfHits = 3,
    minPt               = 0.1,
)
pixelPairStepTrajectoryFilterBase = _pixelPairStepTrajectoryFilterBase.clone(
    seedPairPenalty = 0,
    maxCCCLostHits  = 0,
    minGoodStripCharge = dict(refToPSet_ = 'SiStripClusterChargeCutLoose')
)
from Configuration.Eras.Modifier_tracker_apv_vfp30_2016_cff import tracker_apv_vfp30_2016
_tracker_apv_vfp30_2016.toModify(pixelPairStepTrajectoryFilterBase, maxCCCLostHits = 2)
trackingLowPU.toReplaceWith(pixelPairStepTrajectoryFilterBase, _pixelPairStepTrajectoryFilterBase)
trackingPhase1.toModify(pixelPairStepTrajectoryFilterBase, minimumNumberOfHits = 4)
trackingPhase2PU140.toReplaceWith(pixelPairStepTrajectoryFilterBase, _pixelPairStepTrajectoryFilterBase.clone(
    minimumNumberOfHits = 4,
    maxLostHitsFraction = 1./10.,
    constantValueForLostHitsFractionFilter = 0.701,
))
highBetaStar.toModify(pixelPairStepTrajectoryFilterBase, minPt = 0.05)

import RecoTracker.PixelLowPtUtilities.StripSubClusterShapeTrajectoryFilter_cfi
pixelPairStepTrajectoryFilterShape = RecoTracker.PixelLowPtUtilities.StripSubClusterShapeTrajectoryFilter_cfi.StripSubClusterShapeTrajectoryFilterTIX12.clone()
pixelPairStepTrajectoryFilter = cms.PSet(
    ComponentType = cms.string('CompositeTrajectoryFilter'),
    filters = cms.VPSet(
        cms.PSet( refToPSet_ = cms.string('pixelPairStepTrajectoryFilterBase')),
    #    cms.PSet( refToPSet_ = cms.string('pixelPairStepTrajectoryFilterShape'))
    ),
)
from RecoTracker.PixelLowPtUtilities.ClusterShapeTrajectoryFilter_cfi import *
trackingPhase2PU140.toModify(pixelPairStepTrajectoryFilter,
    filters = pixelPairStepTrajectoryFilter.filters + [cms.PSet(refToPSet_ = cms.string('ClusterShapeTrajectoryFilter'))]
)



pixelPairStepTrajectoryFilterInOut = pixelPairStepTrajectoryFilterBase.clone(
    minimumNumberOfHits = 4,
    seedExtension       = 1,
    strictSeedExtension = False, # allow inactive
    pixelSeedExtension  = False,
)



import RecoTracker.MeasurementDet.Chi2ChargeMeasurementEstimator_cfi
pixelPairStepChi2Est = RecoTracker.MeasurementDet.Chi2ChargeMeasurementEstimator_cfi.Chi2ChargeMeasurementEstimator.clone(
    ComponentName    = 'pixelPairStepChi2Est',
    nSigma           = 3.0,
    MaxChi2          = 9.0,
    clusterChargeCut = dict(refToPSet_ = 'SiStripClusterChargeCutLoose'),
    pTChargeCutThreshold = 15.
)
_tracker_apv_vfp30_2016.toModify(pixelPairStepChi2Est,
    clusterChargeCut = dict(refToPSet_ = 'SiStripClusterChargeCutTiny')
)
trackingLowPU.toModify(pixelPairStepChi2Est,
    clusterChargeCut = dict(refToPSet_ = 'SiStripClusterChargeCutTiny'),
)
highBetaStar.toModify(pixelPairStepChi2Est, MaxChi2 = 30)

# TRACK BUILDING
import RecoTracker.CkfPattern.GroupedCkfTrajectoryBuilder_cfi
pixelPairStepTrajectoryBuilder = RecoTracker.CkfPattern.GroupedCkfTrajectoryBuilder_cfi.GroupedCkfTrajectoryBuilderIterativeDefault.clone(
    trajectoryFilter       = dict(refToPSet_ = 'pixelPairStepTrajectoryFilter'),
    maxCand                = 3,
    estimator              = 'pixelPairStepChi2Est',
    maxDPhiForLooperReconstruction = 2.0,
    maxPtForLooperReconstruction = 0.7,
)
trackingNoLoopers.toModify(pixelPairStepTrajectoryBuilder,
                           maxPtForLooperReconstruction = 0.0)
trackingLowPU.toModify(pixelPairStepTrajectoryBuilder, maxCand = 2)
_seedExtension = dict(
    inOutTrajectoryFilter = dict(refToPSet_ = 'pixelPairStepTrajectoryFilterInOut'),
    useSameTrajFilter     = False,
)
trackingPhase1.toModify(pixelPairStepTrajectoryBuilder, **_seedExtension)
trackingPhase2PU140.toModify(pixelPairStepTrajectoryBuilder, **_seedExtension)




# MAKING OF TRACK CANDIDATES
import RecoTracker.CkfPattern.CkfTrackCandidates_cfi
# Give handle for CKF for HI
_pixelPairStepTrackCandidatesCkf = RecoTracker.CkfPattern.CkfTrackCandidates_cfi.ckfTrackCandidatesIterativeDefault.clone(
    src = 'pixelPairStepSeeds',
    clustersToSkip = 'pixelPairStepClusters',
    TrajectoryBuilderPSet = dict(refToPSet_ = 'pixelPairStepTrajectoryBuilder'),
    ### these two parameters are relevant only for the CachingSeedCleanerBySharedInput
    numHitsForSeedCleaner = 50,
    onlyPixelHitsForSeedCleaner = True,
)
pixelPairStepTrackCandidates = _pixelPairStepTrackCandidatesCkf.clone()

from Configuration.ProcessModifiers.trackingMkFitPixelPairStep_cff import trackingMkFitPixelPairStep
import RecoTracker.MkFit.mkFitSeedConverter_cfi as _mkFitSeedConverter_cfi
import RecoTracker.MkFit.mkFitIterationConfigESProducer_cfi as _mkFitIterationConfigESProducer_cfi
import RecoTracker.MkFit.mkFitProducer_cfi as _mkFitProducer_cfi
import RecoTracker.MkFit.mkFitOutputConverter_cfi as _mkFitOutputConverter_cfi
pixelPairStepTrackCandidatesMkFitSeeds = _mkFitSeedConverter_cfi.mkFitSeedConverter.clone(
    seeds = 'pixelPairStepSeeds',
)
pixelPairStepTrackCandidatesMkFitConfig = _mkFitIterationConfigESProducer_cfi.mkFitIterationConfigESProducer.clone(
    ComponentName = 'pixelPairStepTrackCandidatesMkFitConfig',
    config = 'RecoTracker/MkFit/data/mkfit-phase1-pixelPairStep.json',
)
pixelPairStepTrackCandidatesMkFit = _mkFitProducer_cfi.mkFitProducer.clone(
    seeds = 'pixelPairStepTrackCandidatesMkFitSeeds',
    config = ('', 'pixelPairStepTrackCandidatesMkFitConfig'),
    clustersToSkip = 'pixelPairStepClusters',
)
trackingMkFitPixelPairStep.toReplaceWith(pixelPairStepTrackCandidates, _mkFitOutputConverter_cfi.mkFitOutputConverter.clone(
    seeds = 'pixelPairStepSeeds',
    mkFitSeeds = 'pixelPairStepTrackCandidatesMkFitSeeds',
    tracks = 'pixelPairStepTrackCandidatesMkFit',
))

trackingPhase2PU140.toModify(pixelPairStepTrackCandidates,
    clustersToSkip = '',
    phase2clustersToSkip = 'pixelPairStepClusters',
    TrajectoryCleaner = 'pixelPairStepTrajectoryCleanerBySharedHits'
)
import FastSimulation.Tracking.TrackCandidateProducer_cfi
fastSim.toReplaceWith(pixelPairStepTrackCandidates,
                      FastSimulation.Tracking.TrackCandidateProducer_cfi.trackCandidateProducer.clone(
        src = 'pixelPairStepSeeds',
        MinNumberOfCrossedLayers = 2, # ?
        hitMasks = cms.InputTag('pixelPairStepMasks')
        )
)

from TrackingTools.TrajectoryCleaning.TrajectoryCleanerBySharedHits_cfi import trajectoryCleanerBySharedHits as _trajectoryCleanerBySharedHits
pixelPairStepTrajectoryCleanerBySharedHits = _trajectoryCleanerBySharedHits.clone(
    ComponentName       = 'pixelPairStepTrajectoryCleanerBySharedHits',
    fractionShared      = 0.095,
    allowSharedFirstHit = True
)
trackingPhase2PU140.toModify(pixelPairStepTrajectoryCleanerBySharedHits, fractionShared = 0.09)

# TRACK FITTING
import RecoTracker.TrackProducer.TrackProducerIterativeDefault_cfi
pixelPairStepTracks = RecoTracker.TrackProducer.TrackProducerIterativeDefault_cfi.TrackProducerIterativeDefault.clone(
    AlgorithmName = 'pixelPairStep',
    src           = 'pixelPairStepTrackCandidates',
    Fitter        = 'FlexibleKFFittingSmoother'
)
fastSim.toModify(pixelPairStepTracks, TTRHBuilder = 'WithoutRefit')

from Configuration.Eras.Modifier_phase2_timing_layer_cff import phase2_timing_layer
phase2_timing_layer.toModify(pixelPairStepTracks, TrajectoryInEvent = True)

# Final selection
from RecoTracker.FinalTrackSelectors.TrackMVAClassifierPrompt_cfi import *
pixelPairStep =  TrackMVAClassifierPrompt.clone(
    src         = 'pixelPairStepTracks',
    mva         = dict(GBRForestLabel = 'MVASelectorIter2_13TeV'),
    qualityCuts = [-0.2,0.0,0.3]
)
trackingPhase1.toModify(pixelPairStep, mva=dict(GBRForestLabel = 'MVASelectorPixelPairStep_Phase1'))

from RecoTracker.FinalTrackSelectors.trackTfClassifier_cfi import *
from RecoTracker.FinalTrackSelectors.trackSelectionTf_cfi import *
from RecoTracker.FinalTrackSelectors.trackSelectionTf_CKF_cfi import *
trackdnn.toReplaceWith(pixelPairStep, trackTfClassifier.clone(
    src='pixelPairStepTracks',
    qualityCuts=qualityCutDictionary.PixelPairStep.value()
))

highBetaStar.toModify(pixelPairStep,qualityCuts = [-0.95,0.0,0.3])
pp_on_AA.toModify(pixelPairStep, qualityCuts = [0.85, 0.95, 0.98])
fastSim.toModify(pixelPairStep, vertices = 'firstStepPrimaryVerticesBeforeMixing')

# For LowPU and Phase2PU140
import RecoTracker.IterativeTracking.LowPtTripletStep_cff
import RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi
pixelPairStepSelector = RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.multiTrackSelector.clone(
    src            = 'pixelPairStepTracks',
    useAnyMVA      = cms.bool(True),
    GBRForestLabel = cms.string('MVASelectorIter2'),
    trackSelectors = cms.VPSet(
        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.looseMTS.clone(
            name = 'pixelPairStepLoose',
        ), #end of pset
        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.tightMTS.clone(
            name = 'pixelPairStepTight',
            preFilterName = 'pixelPairStepLoose',
        ),
        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.highpurityMTS.clone(
            name = 'QualityMasks',
            preFilterName = 'pixelPairStepTight',
        ),
    ),
    vertices = 'pixelVertices' #end of vpset
) #end of clone
trackingPhase2PU140.toModify(pixelPairStepSelector,
    useAnyMVA      = None,
    GBRForestLabel = None,
    trackSelectors = cms.VPSet(
        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.looseMTS.clone(
            name = 'pixelPairStepLoose',
            chi2n_par = 0.7,
            res_par = ( 0.003, 0.002 ),
            minNumberLayers = 3,
            maxNumberLostLayers = 2,
            minNumber3DLayers = 3,
            d0_par1 = ( 0.4, 4.0 ),
            dz_par1 = ( 0.4, 4.0 ),
            d0_par2 = ( 0.6, 4.0 ),
            dz_par2 = ( 0.45, 4.0 )
            ), #end of pset
        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.tightMTS.clone(
            name = 'pixelPairStepTight',
            preFilterName = 'pixelPairStepLoose',
            chi2n_par = 0.6,
            res_par = ( 0.003, 0.002 ),
            minNumberLayers = 4,
            maxNumberLostLayers = 2,
            minNumber3DLayers = 3,
            d0_par1 = ( 0.35, 4.0 ),
            dz_par1 = ( 0.35, 4.0 ),
            d0_par2 = ( 0.5, 4.0 ),
            dz_par2 = ( 0.4, 4.0 )
            ),
        RecoTracker.FinalTrackSelectors.multiTrackSelector_cfi.highpurityMTS.clone(
            name = 'pixelPairStep',
            preFilterName = 'pixelPairStepTight',
#            min_eta = -4.0, # useless, the eta distribution does not even reach |eta| = 3 (!)
#            max_eta = 4.0,
            chi2n_par = 0.5,
            res_par = ( 0.003, 0.001 ),
            minNumberLayers = 5,
            maxNumberLostLayers = 2,
            minNumber3DLayers = 4,
            d0_par1 = ( 0.3, 4.0 ),
            dz_par1 = ( 0.3, 4.0 ),
            d0_par2 = ( 0.45, 4.0 ),
            dz_par2 = ( 0.35, 4.0 )
            ),
        ), #end of vpset
    vertices = 'firstStepPrimaryVertices'
) #end of clone

fastSim.toModify(pixelPairStepSelector, vertices = "firstStepPrimaryVerticesBeforeMixing")

from Configuration.ProcessModifiers.vectorHits_cff import vectorHits
vectorHits.toModify(pixelPairStepSelector.trackSelectors[2], minNumberLayers = 3, minNumber3DLayers = 3)

# Final sequence
PixelPairStepTask = cms.Task(pixelPairStepClusters,
                         pixelPairStepSeedLayers,
                         pixelPairStepTrackingRegions,
                         pixelPairStepHitDoublets,
                         pixelPairStepSeeds,
                         pixelPairStepTrackCandidates,
                         pixelPairStepTracks,
                         pixelPairStep)
PixelPairStep = cms.Sequence(PixelPairStepTask)

_PixelPairStepTask_trackingMkFit = PixelPairStepTask.copy()
_PixelPairStepTask_trackingMkFit.add(pixelPairStepTrackCandidatesMkFitSeeds, pixelPairStepTrackCandidatesMkFit, pixelPairStepTrackCandidatesMkFit)
trackingMkFitPixelPairStep.toReplaceWith(PixelPairStepTask, _PixelPairStepTask_trackingMkFit)

_PixelPairStepTask_LowPU_Phase2PU140 = PixelPairStepTask.copy()
_PixelPairStepTask_LowPU_Phase2PU140.replace(pixelPairStep, pixelPairStepSelector)
trackingLowPU.toReplaceWith(PixelPairStepTask, _PixelPairStepTask_LowPU_Phase2PU140)
trackingPhase2PU140.toReplaceWith(PixelPairStepTask, _PixelPairStepTask_LowPU_Phase2PU140)

_PixelPairStepTask_Phase1 = PixelPairStepTask.copy()
_PixelPairStepTask_pp_on_AA = PixelPairStepTask.copy()
_PixelPairStepTask_Phase1.replace(pixelPairStepSeeds,cms.Task(
                              pixelPairStepSeedsA ,
                              pixelPairStepTrackingRegionsSeedLayersB,pixelPairStepHitDoubletsB,pixelPairStepSeedsB,
                              pixelPairStepSeeds))
trackingPhase1.toReplaceWith(PixelPairStepTask, _PixelPairStepTask_Phase1)

_PixelPairStepTask_pp_on_AA.replace(pixelPairStepHitDoublets, cms.Task(pixelPairStepTrackingRegionsSeedLayersB,pixelPairStepHitDoubletsB))
(pp_on_XeXe_2017 | pp_on_AA).toReplaceWith(PixelPairStepTask, _PixelPairStepTask_pp_on_AA)

#fastSim
import FastSimulation.Tracking.FastTrackerRecHitMaskProducer_cfi
pixelPairStepMasks = FastSimulation.Tracking.FastTrackerRecHitMaskProducer_cfi.maskProducerFromClusterRemover(pixelPairStepClusters)
_PixelPairStepTask_fastSim = cms.Task(pixelPairStepMasks
                                     ,pixelPairStepTrackingRegions
                                     ,pixelPairStepSeeds
                                     ,pixelPairStepTrackCandidates
                                     ,pixelPairStepTracks
                                     ,pixelPairStep
)
_PixelPairStepTask_fastSim_phase2 = _PixelPairStepTask_fastSim.copy()
_PixelPairStepTask_fastSim_phase2.replace(pixelPairStep, pixelPairStepSelector)
fastSim.toReplaceWith(PixelPairStepTask, _PixelPairStepTask_fastSim)
(fastSim & trackingPhase2PU140).toReplaceWith(PixelPairStepTask, _PixelPairStepTask_fastSim_phase2)