---

SiPixelTrackResidualSource.cc

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// Package:    SiPixelMonitorTrack
// Class:      SiPixelTrackResidualSource
// 
// class SiPixelTrackResidualSource SiPixelTrackResidualSource.cc 
//       DQM/SiPixelMonitorTrack/src/SiPixelTrackResidualSource.cc
//
// Description: SiPixel hit-to-track residual data quality monitoring modules
// Implementation: prototype -> improved -> never final - end of the 1st step 
//
// Original Author: Shan-Huei Chuang
//         Created: Fri Mar 23 18:41:42 CET 2007
// $Id: SiPixelTrackResidualSource.cc,v 1.4 2008/11/05 13:53:08 wehrlilu Exp $


#include <iostream>
#include <map>
#include <string>
#include <vector>
#include <utility>

#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/ESHandle.h"

#include "DataFormats/Common/interface/Handle.h"
#include "DataFormats/TrackCandidate/interface/TrackCandidateCollection.h"

#include "DataFormats/SiPixelDetId/interface/PXBDetId.h"
#include "DataFormats/SiPixelDetId/interface/PXFDetId.h"
#include "DataFormats/SiPixelDetId/interface/PixelSubdetector.h"

#include "DataFormats/TrackingRecHit/interface/TrackingRecHitFwd.h"

#include "Geometry/TrackerGeometryBuilder/interface/PixelGeomDetUnit.h"

#include "RecoTracker/TransientTrackingRecHit/interface/TkTransientTrackingRecHitBuilder.h"

#include "TrackingTools/PatternTools/interface/TrajectoryFitter.h"
#include "TrackingTools/Records/interface/TransientRecHitRecord.h"
#include "TrackingTools/Records/interface/TrackingComponentsRecord.h"
#include "TrackingTools/TrackFitters/interface/TrajectoryStateCombiner.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateTransform.h"

#include "DQMServices/Core/interface/DQMStore.h"
#include "DQM/SiPixelCommon/interface/SiPixelFolderOrganizer.h"
#include "DQM/SiPixelMonitorTrack/interface/SiPixelTrackResidualSource.h"


using namespace std;
using namespace edm;


SiPixelTrackResidualSource::SiPixelTrackResidualSource(const edm::ParameterSet& pSet) :
  pSet_(pSet),
  modOn( pSet.getUntrackedParameter<bool>("modOn",true) ),
  ladOn( pSet.getUntrackedParameter<bool>("ladOn",false) ), 
  layOn( pSet.getUntrackedParameter<bool>("layOn",false) ), 
  phiOn( pSet.getUntrackedParameter<bool>("phiOn",false) ), 
  ringOn( pSet.getUntrackedParameter<bool>("ringOn",false) ), 
  bladeOn( pSet.getUntrackedParameter<bool>("bladeOn",false) ), 
  diskOn( pSet.getUntrackedParameter<bool>("diskOn",false) )
 { 
   pSet_ = pSet; 
  debug_ = pSet_.getUntrackedParameter<bool>("debug", false); 
    src_ = pSet_.getParameter<edm::InputTag>("src"); 
    clustersrc_ = pSet_.getParameter<edm::InputTag>("clustersrc");
    tracksrc_ = pSet_.getParameter<edm::InputTag>("trajectoryInput");
    dbe_ = edm::Service<DQMStore>().operator->();

  LogInfo("PixelDQM") << "SiPixelTrackResidualSource constructor" << endl;
  LogInfo ("PixelDQM") << "Mod/Lad/Lay/Phi " << modOn << "/" << ladOn << "/" 
            << layOn << "/" << phiOn << std::endl;
  LogInfo ("PixelDQM") << "Blade/Disk/Ring" << bladeOn << "/" << diskOn << "/" 
            << ringOn << std::endl;
}


SiPixelTrackResidualSource::~SiPixelTrackResidualSource() {
  LogInfo("PixelDQM") << "SiPixelTrackResidualSource destructor" << endl;
}


void SiPixelTrackResidualSource::beginJob(edm::EventSetup const& iSetup) {
  LogInfo("PixelDQM") << "SiPixelTrackResidualSource beginJob()" << endl;

  // retrieve TrackerGeometry for pixel dets
  edm::ESHandle<TrackerGeometry> TG;
  iSetup.get<TrackerDigiGeometryRecord>().get(TG);
  if (debug_) LogVerbatim("PixelDQM") << "TrackerGeometry "<< &(*TG) <<" size is "<< TG->dets().size() << endl;
 
  // build theSiPixelStructure with the pixel barrel and endcap dets from TrackerGeometry
  for (TrackerGeometry::DetContainer::const_iterator pxb = TG->detsPXB().begin();  
       pxb!=TG->detsPXB().end(); pxb++) {
    if (dynamic_cast<PixelGeomDetUnit*>((*pxb))!=0) {
      SiPixelTrackResidualModule* module = new SiPixelTrackResidualModule((*pxb)->geographicalId().rawId());
      theSiPixelStructure.insert(pair<uint32_t, SiPixelTrackResidualModule*>((*pxb)->geographicalId().rawId(), module));
    }
  }
  for (TrackerGeometry::DetContainer::const_iterator pxf = TG->detsPXF().begin(); 
       pxf!=TG->detsPXF().end(); pxf++) {
    if (dynamic_cast<PixelGeomDetUnit*>((*pxf))!=0) {
      SiPixelTrackResidualModule* module = new SiPixelTrackResidualModule((*pxf)->geographicalId().rawId());
      theSiPixelStructure.insert(pair<uint32_t, SiPixelTrackResidualModule*>((*pxf)->geographicalId().rawId(), module));
    }
  }
  LogInfo("PixelDQM") << "SiPixelStructure size is " << theSiPixelStructure.size() << endl;

  dbe_->setVerbose(0);

  // book residual histograms in theSiPixelFolder - one (x,y) pair of histograms per det
  SiPixelFolderOrganizer theSiPixelFolder;
  for (std::map<uint32_t, SiPixelTrackResidualModule*>::iterator pxd = theSiPixelStructure.begin(); 
       pxd!=theSiPixelStructure.end(); pxd++) {

    if(modOn){
      if (theSiPixelFolder.setModuleFolder((*pxd).first)) (*pxd).second->book(pSet_);
      else throw cms::Exception("LogicError") << "SiPixelTrackResidualSource Folder Creation Failed! "; 
    }
    if(ladOn){
      if (theSiPixelFolder.setModuleFolder((*pxd).first,1)) {
        
        (*pxd).second->book(pSet_,1);
      }
      else throw cms::Exception("LogicError") << "SiPixelTrackResidualSource ladder Folder Creation Failed! "; 
    }
    if(layOn){
      if (theSiPixelFolder.setModuleFolder((*pxd).first,2)) (*pxd).second->book(pSet_,2);
      else throw cms::Exception("LogicError") << "SiPixelTrackResidualSource layer Folder Creation Failed! "; 
    }
    if(phiOn){
      if (theSiPixelFolder.setModuleFolder((*pxd).first,3)) (*pxd).second->book(pSet_,3);
      else throw cms::Exception("LogicError") << "SiPixelTrackResidualSource phi Folder Creation Failed! "; 
    }
    if(bladeOn){
      if (theSiPixelFolder.setModuleFolder((*pxd).first,4)) (*pxd).second->book(pSet_,4);
      else throw cms::Exception("LogicError") << "SiPixelTrackResidualSource Blade Folder Creation Failed! "; 
    }
    if(diskOn){
      if (theSiPixelFolder.setModuleFolder((*pxd).first,5)) (*pxd).second->book(pSet_,5);
      else throw cms::Exception("LogicError") << "SiPixelTrackResidualSource Disk Folder Creation Failed! "; 
    }
    if(ringOn){
      if (theSiPixelFolder.setModuleFolder((*pxd).first,6)) (*pxd).second->book(pSet_,6);
      else throw cms::Exception("LogicError") << "SiPixelTrackResidualSource Ring Folder Creation Failed! "; 
    }
  }


//   edm::InputTag tracksrc = pSet_.getParameter<edm::InputTag>("trajectoryInput");
//   edm::InputTag clustersrc = pSet_.getParameter<edm::InputTag>("clustersrc");

  //number of tracks
  dbe_->setCurrentFolder("Pixel/Tracks");
  meNofTracks_ = dbe_->book1D("ntracks_" + tracksrc_.label(),"Number of Tracks",4,0,4);
  meNofTracks_->setAxisTitle("Number of Tracks",1);
  meNofTracks_->setBinLabel(1,"All");
  meNofTracks_->setBinLabel(2,"Pixel");
  meNofTracks_->setBinLabel(3,"BPix");
  meNofTracks_->setBinLabel(4,"FPix");

  //number of tracks in pixel fiducial volume
  dbe_->setCurrentFolder("Pixel/Tracks");
  meNofTracksInPixVol_ = dbe_->book1D("ntracksInPixVol_" + tracksrc_.label(),"Number of Tracks crossing Pixel fiducial Volume",2,0,2);
  meNofTracksInPixVol_->setAxisTitle("Number of Tracks",1);
  meNofTracksInPixVol_->setBinLabel(1,"With Hits");
  meNofTracksInPixVol_->setBinLabel(2,"Without Hits");

  //number of clusters (associated to track / not associated)
  dbe_->setCurrentFolder("Pixel/Clusters/OnTrack");
  meNofClustersOnTrack_ = dbe_->book1D("nclusters_" + clustersrc_.label(),"Number of Clusters (on track)",3,0,3);
  meNofClustersOnTrack_->setAxisTitle("Number of Clusters on Track",1);
  meNofClustersOnTrack_->setBinLabel(1,"All");
  meNofClustersOnTrack_->setBinLabel(2,"BPix");
  meNofClustersOnTrack_->setBinLabel(3,"FPix");
  dbe_->setCurrentFolder("Pixel/Clusters/OffTrack");
  meNofClustersNotOnTrack_ = dbe_->book1D("nclusters_" + clustersrc_.label(),"Number of Clusters (off track)",3,0,3);
  meNofClustersNotOnTrack_->setAxisTitle("Number of Clusters off Track",1);
  meNofClustersNotOnTrack_->setBinLabel(1,"All");
  meNofClustersNotOnTrack_->setBinLabel(2,"BPix");
  meNofClustersNotOnTrack_->setBinLabel(3,"FPix");

  //cluster charge and size
  //charge
  //on track
  dbe_->setCurrentFolder("Pixel/Clusters/OnTrack");
  meClChargeOnTrack_all = dbe_->book1D("charge_" + clustersrc_.label(),"Charge (on track)",500,0.,500.);
  meClChargeOnTrack_all->setAxisTitle("Charge size (MeV)",1);
  meClChargeOnTrack_bpix = dbe_->book1D("charge_" + clustersrc_.label() + "_Barrel","Charge (on track, barrel)",500,0.,500.);
  meClChargeOnTrack_bpix->setAxisTitle("Charge size (MeV)",1);
  meClChargeOnTrack_fpix = dbe_->book1D("charge_" + clustersrc_.label() + "_Endcap","Charge (on track, endcap)",500,0.,500.);
  meClChargeOnTrack_fpix->setAxisTitle("Charge size (MeV)",1);
  //off track
  dbe_->setCurrentFolder("Pixel/Clusters/OffTrack");
  meClChargeNotOnTrack_all = dbe_->book1D("charge_" + clustersrc_.label(),"Charge (off track)",500,0.,500.);
  meClChargeNotOnTrack_all->setAxisTitle("Charge size (MeV)",1);
  meClChargeNotOnTrack_bpix = dbe_->book1D("charge_" + clustersrc_.label() + "_Barrel","Charge (off track, barrel)",500,0.,500.);
  meClChargeNotOnTrack_bpix->setAxisTitle("Charge size (MeV)",1);
  meClChargeNotOnTrack_fpix = dbe_->book1D("charge_" + clustersrc_.label() + "_Endcap","Charge (off track, endcap)",500,0.,500.);
  meClChargeNotOnTrack_fpix->setAxisTitle("Charge size (MeV)",1);
  //size
  //on track
  dbe_->setCurrentFolder("Pixel/Clusters/OnTrack");
  meClSizeOnTrack_all = dbe_->book1D("size_" + clustersrc_.label(),"Size (on track)",100,0.,100.);
  meClSizeOnTrack_all->setAxisTitle("Cluster size (in pixels)",1);
  meClSizeOnTrack_bpix = dbe_->book1D("size" + clustersrc_.label() + "_Barrel","Size (on track, barrel)",100,0.,100.);
  meClSizeOnTrack_bpix->setAxisTitle("Cluster size (in pixels)",1);
  meClSizeOnTrack_fpix = dbe_->book1D("size_" + clustersrc_.label() + "_Endcap","Size (on track, endcap)",100,0.,100.);
  meClSizeOnTrack_fpix->setAxisTitle("Cluster size (in pixels)",1);
  //off track
  dbe_->setCurrentFolder("Pixel/Clusters/OffTrack");
  meClSizeNotOnTrack_all = dbe_->book1D("size_" + clustersrc_.label(),"Size (off track)",100,0.,100.);
  meClSizeNotOnTrack_all->setAxisTitle("Cluster size (in pixels)",1);
  
  meClSizeNotOnTrack_bpix = dbe_->book1D("size_" + clustersrc_.label() + "_Barrel","Size (off track, barrel)",100,0.,100.);
  meClSizeNotOnTrack_bpix->setAxisTitle("Cluster size (in pixels)",1);
  
  meClSizeNotOnTrack_fpix = dbe_->book1D("size_" + clustersrc_.label() + "_Endcap","Size (off track, endcap)",100,0.,100.);
  meClSizeNotOnTrack_fpix->setAxisTitle("Cluster size (in pixels)",1);


  //cluster global position
  //on track
  dbe_->setCurrentFolder("Pixel/Clusters/OnTrack");
  //bpix
  meClPosLayer1OnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_Layer_1","Clusters Layer1 (on track)",200,-30.,30.,128,-3.2,3.2);
  meClPosLayer1OnTrack->setAxisTitle("Global Z (cm)",1);
  meClPosLayer1OnTrack->setAxisTitle("Global #phi",2);
  meClPosLayer2OnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_Layer_2","Clusters Layer2 (on track)",200,-30.,30.,128,-3.2,3.2);
  meClPosLayer2OnTrack->setAxisTitle("Global Z (cm)",1);
  meClPosLayer2OnTrack->setAxisTitle("Global #phi",2);
  meClPosLayer3OnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_Layer_3","Clusters Layer3 (on track)",200,-30.,30.,128,-3.2,3.2);
  meClPosLayer3OnTrack->setAxisTitle("Global Z (cm)",1);
  meClPosLayer3OnTrack->setAxisTitle("Global #phi",2);
  //fpix
  meClPosDisk1pzOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_pz_Disk_1","Clusters +Z Disk1 (on track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk1pzOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk1pzOnTrack->setAxisTitle("Global Y (cm)",2);
  meClPosDisk2pzOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_pz_Disk_2","Clusters +Z Disk2 (on track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk2pzOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk2pzOnTrack->setAxisTitle("Global Y (cm)",2);
  meClPosDisk1mzOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_mz_Disk_1","Clusters -Z Disk1 (on track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk1mzOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk1mzOnTrack->setAxisTitle("Global Y (cm)",2);
  meClPosDisk2mzOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_mz_Disk_2","Clusters -Z Disk2 (on track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk2mzOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk2mzOnTrack->setAxisTitle("Global Y (cm)",2);
  //not on track
  dbe_->setCurrentFolder("Pixel/Clusters/OffTrack");
  //bpix
  meClPosLayer1NotOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_Layer_1","Clusters Layer1 (off track)",200,-30.,30.,128,-3.2,3.2);
  meClPosLayer1NotOnTrack->setAxisTitle("Global Z (cm)",1);
  meClPosLayer1NotOnTrack->setAxisTitle("Global #phi",2);
  meClPosLayer2NotOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_Layer_2","Clusters Layer2 (off track)",200,-30.,30.,128,-3.2,3.2);
  meClPosLayer2NotOnTrack->setAxisTitle("Global Z (cm)",1);
  meClPosLayer2NotOnTrack->setAxisTitle("Global #phi",2);
  meClPosLayer3NotOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_Layer_3","Clusters Layer3 (off track)",200,-30.,30.,128,-3.2,3.2);
  meClPosLayer3NotOnTrack->setAxisTitle("Global Z (cm)",1);
  meClPosLayer3NotOnTrack->setAxisTitle("Global #phi",2);
  //fpix
  meClPosDisk1pzNotOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_pz_Disk_1","Clusters +Z Disk1 (off track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk1pzNotOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk1pzNotOnTrack->setAxisTitle("Global Y (cm)",2);
  meClPosDisk2pzNotOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_pz_Disk_2","Clusters +Z Disk2 (off track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk2pzNotOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk2pzNotOnTrack->setAxisTitle("Global Y (cm)",2);
  meClPosDisk1mzNotOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_mz_Disk_1","Clusters -Z Disk1 (off track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk1mzNotOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk1mzNotOnTrack->setAxisTitle("Global Y (cm)",2);
  meClPosDisk2mzNotOnTrack = dbe_->book2D("position_" + clustersrc_.label() + "_mz_Disk_2","Clusters -Z Disk2 (off track)",80,-20.,20.,80,-20.,20.);
  meClPosDisk2mzNotOnTrack->setAxisTitle("Global X (cm)",1);
  meClPosDisk2mzNotOnTrack->setAxisTitle("Global Y (cm)",2);

  if (debug_) {
    // book summary residual histograms in a debugging folder - one (x,y) pair of histograms per subdetector 
    dbe_->setCurrentFolder("debugging"); 
    char hisID[80]; 
    for (int s=0; s<3; s++) {
      sprintf(hisID,"residual_x_subdet_%i",s); 
      meSubdetResidualX[s] = dbe_->book1D(hisID,"Pixel Hit-to-Track Residual in X",500,-5.,5.);
      
      sprintf(hisID,"residual_y_subdet_%i",s);
      meSubdetResidualY[s] = dbe_->book1D(hisID,"Pixel Hit-to-Track Residual in Y",500,-5.,5.);  
    }
  }
}


void SiPixelTrackResidualSource::endJob(void) {
  LogInfo("PixelDQM") << "SiPixelTrackResidualSource endJob()";

  // save the residual histograms to an output root file
  bool saveFile = pSet_.getUntrackedParameter<bool>("saveFile", true);
  if (saveFile) { 
    std::string outputFile = pSet_.getParameter<std::string>("outputFile");
    LogInfo("PixelDQM") << " - saving histograms to "<< outputFile.data();
    dbe_->save(outputFile);
  } 
  LogInfo("PixelDQM") << endl; // dbe_->showDirStructure();
}


void SiPixelTrackResidualSource::analyze(const edm::Event& iEvent, const edm::EventSetup& iSetup) {


  // retrieve TrackerGeometry again and MagneticField for use in transforming 
  // a TrackCandidate's P(ersistent)TrajectoryStateoOnDet (PTSoD) to a TrajectoryStateOnSurface (TSoS)
  ESHandle<TrackerGeometry> TG;
  iSetup.get<TrackerDigiGeometryRecord>().get(TG);
  const TrackerGeometry* theTrackerGeometry = TG.product();
  
  ESHandle<MagneticField> MF;
  iSetup.get<IdealMagneticFieldRecord>().get(MF);
  const MagneticField* theMagneticField = MF.product();
  
  // retrieve TransientTrackingRecHitBuilder to build TTRHs with TrackCandidate's TrackingRecHits for refitting 
  std::string TTRHBuilder = pSet_.getParameter<std::string>("TTRHBuilder"); 
  ESHandle<TransientTrackingRecHitBuilder> TTRHB; 
  iSetup.get<TransientRecHitRecord>().get(TTRHBuilder, TTRHB);
  const TransientTrackingRecHitBuilder* theTTRHBuilder = TTRHB.product();
   
  // get a fitter to refit TrackCandidates, the same fitter as used in standard reconstruction 
  std::string Fitter = pSet_.getParameter<std::string>("Fitter");
  ESHandle<TrajectoryFitter> TF;
  iSetup.get<TrackingComponentsRecord>().get(Fitter, TF);
  const TrajectoryFitter* theFitter = TF.product();

  // get TrackCandidateCollection in accordance with the fitter, i.e. rs-RS, ckf-KF... 
  std::string TrackCandidateLabel = pSet_.getParameter<std::string>("TrackCandidateLabel");
  std::string TrackCandidateProducer = pSet_.getParameter<std::string>("TrackCandidateProducer");  
  Handle<TrackCandidateCollection> trackCandidateCollection;
  iEvent.getByLabel(TrackCandidateProducer, TrackCandidateLabel, trackCandidateCollection);

  for (TrackCandidateCollection::const_iterator tc = trackCandidateCollection->begin(); 
       tc!=trackCandidateCollection->end(); ++tc) {
    TrajectoryStateTransform transformer; 
    PTrajectoryStateOnDet tcPTSoD = tc->trajectoryStateOnDet();
    TrajectoryStateOnSurface tcTSoS = transformer.transientState(tcPTSoD, &(theTrackerGeometry->idToDet(tcPTSoD.detId())->surface()), 
                                                                 theMagneticField);
    const TrajectorySeed& tcSeed = tc->seed();

    const TrackCandidate::range& tcRecHits = tc->recHits();    
    if (debug_) cout << "track candidate has "<< int(tcRecHits.second - tcRecHits.first) <<" hits with ID "; 
    
    Trajectory::RecHitContainer tcTTRHs;
    for (TrackingRecHitCollection::const_iterator tcRecHit = tcRecHits.first; 
         tcRecHit!=tcRecHits.second; ++tcRecHit) { 
      if (debug_) cout << tcRecHit->geographicalId().rawId() <<" "; 
      
      tcTTRHs.push_back(theTTRHBuilder->build(&(*tcRecHit)));
    } 
    // note a TrackCandidate keeps only the PTSoD of the first hit as well as the seed and all the hits; 
    // to 99.9%-recover all the hit's TSoS's, refit with the seed, the hits and an initial TSoS from the PTSoD 
    // to get a Trajectory of all the hit's TrajectoryMeasurements (TMs) 
    std::vector<Trajectory> refitTrajectoryCollection = theFitter->fit(tcSeed, tcTTRHs, tcTSoS);            
    if (debug_) cout << "refitTrajectoryCollection size is "<< refitTrajectoryCollection.size() << endl;

    if (refitTrajectoryCollection.size()>0) { // should be either 0 or 1 
      const Trajectory& refitTrajectory = refitTrajectoryCollection.front();

      // retrieve and loop over all the TMs 
      Trajectory::DataContainer refitTMs = refitTrajectory.measurements();                                                              
      if (debug_) cout << "refitTrajectory has "<< refitTMs.size() <<" hits with ID "; 

      for (Trajectory::DataContainer::iterator refitTM = refitTMs.begin(); 
           refitTM!=refitTMs.end(); refitTM++) {                                        
        TransientTrackingRecHit::ConstRecHitPointer refitTTRH = refitTM->recHit();
        if (debug_) cout << refitTTRH->geographicalId().rawId() <<" "; 
        
        // only analyze the most elemental pixel hit's TMs to calculate residuals 
        const GeomDet* ttrhDet = refitTTRH->det(); 
        if (ttrhDet->components().empty() && (ttrhDet->subDetector()==GeomDetEnumerators::PixelBarrel ||                                
                                              ttrhDet->subDetector()==GeomDetEnumerators::PixelEndcap)) {                               

          // combine the forward and backward states without using the hit's information (hence unbiased by the hit); 
          // the TM's updated state keeps the state combined and updated with the hit's info but we don't use the updated state at all 
          TrajectoryStateOnSurface combinedTSoS = TrajectoryStateCombiner().combine(refitTM->forwardPredictedState(),        
                                                                                    refitTM->backwardPredictedState());      
          if (refitTTRH->isValid() && combinedTSoS.isValid()) { 
            // calculate the distance between the hit location and the track-crossing point predicted by the combined state 
            const GeomDetUnit* GDU = dynamic_cast<const GeomDetUnit*>(ttrhDet);
            const Topology* theTopology = &(GDU->topology());                                                                   
            
            MeasurementPoint hitPosition = theTopology->measurementPosition(refitTTRH->localPosition());                                
            MeasurementPoint combinedTSoSPosition = theTopology->measurementPosition(combinedTSoS.localPosition());     
            
            Measurement2DVector residual = hitPosition - combinedTSoSPosition;                          
            if(debug_) std::cout << "fill residual " << residual.x() << " " << residual.y() << " \n";
                                                                                                                                
            // fill the residual histograms 
            std::map<uint32_t, SiPixelTrackResidualModule*>::iterator pxd = theSiPixelStructure.find(refitTTRH->geographicalId().rawId());      
            if (pxd!=theSiPixelStructure.end()) (*pxd).second->fill(residual, modOn, ladOn, layOn, phiOn, bladeOn, diskOn, ringOn);                             
                                                                                                                                
            if (debug_) {
              if (ttrhDet->subDetector()==GeomDetEnumerators::PixelBarrel) {                                                   
                meSubdetResidualX[0]->Fill(residual.x());                                                                  
                meSubdetResidualY[0]->Fill(residual.y());                                                                  
              }                                                                                                                
              else {                                                                              
                meSubdetResidualX[PXFDetId(refitTTRH->geographicalId()).side()]->Fill(residual.x());                                                
                meSubdetResidualY[PXFDetId(refitTTRH->geographicalId()).side()]->Fill(residual.y());                                                
              } 
            }                                                                                                                   
          }
        }                                                                                       
      } 
      if (debug_) cout << endl;                                                                                                                         
    }                                                                                                                           
  } 

  //NEWPART

  //get trajectories
  edm::Handle<std::vector<Trajectory> > trajCollectionHandle;
  iEvent.getByLabel(tracksrc_,trajCollectionHandle);
  const std::vector<Trajectory> trajColl = *(trajCollectionHandle.product());
    
  //get tracks
  edm::Handle<std::vector<reco::Track> > trackCollectionHandle;
  iEvent.getByLabel(tracksrc_,trackCollectionHandle);
  const std::vector<reco::Track> trackColl = *(trackCollectionHandle.product());

  //get the map
  edm::Handle<TrajTrackAssociationCollection> match;
  iEvent.getByLabel(tracksrc_,match);
  const TrajTrackAssociationCollection ttac = *(match.product());

  // get clusters
  edm::Handle< edmNew::DetSetVector<SiPixelCluster> >  clusterColl;
  iEvent.getByLabel( clustersrc_, clusterColl );
  const edmNew::DetSetVector<SiPixelCluster> clustColl = *(clusterColl.product());

  if(debug_){
    std::cout << "Trajectories\t : " << trajColl.size() << std::endl;
    std::cout << "recoTracks  \t : " << trackColl.size() << std::endl;
    std::cout << "Map entries \t : " << ttac.size() << std::endl;
  }

  std::set<SiPixelCluster> clusterSet;
  TrajectoryStateCombiner tsoscomb;
  int tracks=0, pixeltracks=0, bpixtracks=0, fpixtracks=0; 
  int trackclusters=0, barreltrackclusters=0, endcaptrackclusters=0;
  int otherclusters=0, barrelotherclusters=0, endcapotherclusters=0;

  //Loop over map entries
  for(TrajTrackAssociationCollection::const_iterator it =  ttac.begin();it !=  ttac.end(); ++it){
    const edm::Ref<std::vector<Trajectory> > traj_iterator = it->key;  
    // Trajectory Map, extract Trajectory for this track
    reco::TrackRef trackref = it->val;
    tracks++;

    bool isBpixtrack = false, isFpixtrack = false, crossesPixVol=false;
    
    //find out whether track crosses pixel fiducial volume (for cosmic tracks)
    
    double d0 = (*trackref).d0(), dz = (*trackref).dz(); 
    
    if(abs(d0)<15 && abs(dz)<50) crossesPixVol = true;

    std::vector<TrajectoryMeasurement> tmeasColl =traj_iterator->measurements();
    std::vector<TrajectoryMeasurement>::const_iterator tmeasIt;
    //loop on measurements to find out whether there are bpix and/or fpix hits
    for(tmeasIt = tmeasColl.begin();tmeasIt!=tmeasColl.end();tmeasIt++){
      if(! tmeasIt->updatedState().isValid()) continue; 
      TransientTrackingRecHit::ConstRecHitPointer testhit = tmeasIt->recHit();
      if(! testhit->isValid() || testhit->geographicalId().det() != DetId::Tracker) continue; 
      uint testSubDetID = (testhit->geographicalId().subdetId()); 
      if(testSubDetID==PixelSubdetector::PixelBarrel) isBpixtrack = true;
      if(testSubDetID==PixelSubdetector::PixelEndcap) isFpixtrack = true;
    }//end loop on measurements
    if(isBpixtrack) {
      bpixtracks++; 
      if(debug_) std::cout << "bpixtrack\n";
    }
    if(isFpixtrack) {
      fpixtracks++; 
      if(debug_) std::cout << "fpixtrack\n";
    }
    if(isBpixtrack || isFpixtrack){
      pixeltracks++;
      
      if(crossesPixVol) meNofTracksInPixVol_->Fill(0,1);

      std::vector<TrajectoryMeasurement> tmeasColl = traj_iterator->measurements();
      for(std::vector<TrajectoryMeasurement>::const_iterator tmeasIt = tmeasColl.begin(); tmeasIt!=tmeasColl.end(); tmeasIt++){   
        if(! tmeasIt->updatedState().isValid()) continue; 
        
        TrajectoryStateOnSurface tsos = tsoscomb( tmeasIt->forwardPredictedState(), tmeasIt->backwardPredictedState() );
        TransientTrackingRecHit::ConstRecHitPointer hit = tmeasIt->recHit();
        if(! hit->isValid() || hit->geographicalId().det() != DetId::Tracker ) {
          continue; 
        } else {
          
//        //residual
          const DetId & hit_detId = hit->geographicalId();
          //uint IntRawDetID = (hit_detId.rawId());
          uint IntSubDetID = (hit_detId.subdetId());
          
          if(IntSubDetID == 0 )
            continue;

          // get the enclosed persistent hit
          const TrackingRecHit *persistentHit = hit->hit();
          // check if it's not null, and if it's a valid pixel hit
          if ((persistentHit != 0) && (typeid(*persistentHit) == typeid(SiPixelRecHit))) {
            // tell the C++ compiler that the hit is a pixel hit
            const SiPixelRecHit* pixhit = dynamic_cast<const SiPixelRecHit*>( hit->hit() );
            // get the edm::Ref to the cluster
            edm::Ref<edmNew::DetSetVector<SiPixelCluster>, SiPixelCluster> const& clust = (*pixhit).cluster();
            //  check if the ref is not null
            if (clust.isNonnull()) {

              //define tracker and pixel geometry and topology
              const TrackerGeometry& theTracker(*theTrackerGeometry);
              const PixelGeomDetUnit* theGeomDet = dynamic_cast<const PixelGeomDetUnit*> (theTracker.idToDet(hit_detId) );
              //test if PixelGeomDetUnit exists
              if(theGeomDet == 0) {
                if(debug_) std::cout << "NO THEGEOMDET\n";
                continue;
              }

              const RectangularPixelTopology * topol = dynamic_cast<const RectangularPixelTopology*>(&(theGeomDet->specificTopology()));
              //fill histograms for clusters on tracks
              trackclusters++;
              meClChargeOnTrack_all->Fill((*clust).charge()/1000.);
              meClSizeOnTrack_all->Fill((*clust).size());
              clusterSet.insert(*clust);

              //find cluster global position (rphi, z)
              // get cluster center of gravity (of charge)
              float xcenter = clust->x();
              float ycenter = clust->y();
              // get the cluster position in local coordinates (cm) 
              LocalPoint clustlp = topol->localPosition( MeasurementPoint(xcenter, ycenter) );
              // get the cluster position in global coordinates (cm)
              GlobalPoint clustgp = theGeomDet->surface().toGlobal( clustlp );

              //find location of hit (barrel or endcap, same for cluster)
              bool barrel = DetId::DetId((*hit).geographicalId()).subdetId() == static_cast<int>(PixelSubdetector::PixelBarrel);
              bool endcap = DetId::DetId((*hit).geographicalId()).subdetId() == static_cast<int>(PixelSubdetector::PixelEndcap);
              if(barrel) {
                barreltrackclusters++;
                meClChargeOnTrack_bpix->Fill((*clust).charge()/1000.);
                meClSizeOnTrack_bpix->Fill((*clust).size());
                uint32_t DBlayer = PixelBarrelName::PixelBarrelName(DetId::DetId((*hit).geographicalId())).layerName();
                float phi = clustgp.phi(); 
                float z = clustgp.z();
                switch(DBlayer){
                case 1: meClPosLayer1OnTrack->Fill(z,phi); break;
                case 2: meClPosLayer2OnTrack->Fill(z,phi); break;
                case 3: meClPosLayer3OnTrack->Fill(z,phi); break;
                
                }
                
              }
              if(endcap) {
                endcaptrackclusters++;
                meClChargeOnTrack_fpix->Fill((*clust).charge()/1000.);
                meClSizeOnTrack_fpix->Fill((*clust).size());
                uint32_t DBdisk = PixelEndcapName::PixelEndcapName(DetId::DetId((*hit).geographicalId())).diskName();
                float x = clustgp.x(); 
                float y = clustgp.y(); 
                float z = clustgp.z();
                if(z>0){
                  if(DBdisk==1) meClPosDisk1pzOnTrack->Fill(x,y);
                  if(DBdisk==2) meClPosDisk2pzOnTrack->Fill(x,y); 
                }
                else{
                  if(DBdisk==1) meClPosDisk1mzOnTrack->Fill(x,y);
                  if(DBdisk==2) meClPosDisk2mzOnTrack->Fill(x,y); 
                } 
              }
              
            }//end if (cluster exists)

          }//end if (persistent hit exists and is pixel hit)
          
        }//end of else 
        
        
      }//end for (all traj measurements of pixeltrack)
    }//end if (is pixeltrack)
    else {
      if(debug_) std::cout << "no pixeltrack:\n";
      if(crossesPixVol) meNofTracksInPixVol_->Fill(1,1);
    }
    
  }//end loop on map entries

  //find clusters that are NOT on track
  //edmNew::DetSet<SiPixelCluster>::const_iterator  di;
  if(debug_) std::cout << "clusters not on track: (size " << clustColl.size() << ") ";

  for(TrackerGeometry::DetContainer::const_iterator it = TG->dets().begin(); it != TG->dets().end(); it++){
    if(dynamic_cast<PixelGeomDetUnit*>((*it))!=0){ 
      DetId detId = (*it)->geographicalId();

      edmNew::DetSetVector<SiPixelCluster>::const_iterator isearch = clustColl.find(detId);
      if( isearch != clustColl.end() ) {  // Not an empty iterator
        edmNew::DetSet<SiPixelCluster>::const_iterator  di;
        for(di=isearch->begin(); di!=isearch->end(); di++){
          unsigned int temp = clusterSet.size();
          clusterSet.insert(*di);
          if(clusterSet.size()>temp) {
            otherclusters++;
            meClSizeNotOnTrack_all->Fill((*di).size());
            meClChargeNotOnTrack_all->Fill((*di).charge()/1000);

            //find cluster global position (rphi, z) get cluster
            //define tracker and pixel geometry and topology
            const TrackerGeometry& theTracker(*theTrackerGeometry);
            const PixelGeomDetUnit* theGeomDet = dynamic_cast<const PixelGeomDetUnit*> (theTracker.idToDet(detId) );
            //test if PixelGeomDetUnit exists
            if(theGeomDet == 0) {
              if(debug_) std::cout << "NO THEGEOMDET\n";
              continue;
            }
            const RectangularPixelTopology * topol = dynamic_cast<const RectangularPixelTopology*>(&(theGeomDet->specificTopology()));
           
            //center of gravity (of charge)
            float xcenter = di->x();
            float ycenter = di->y();
            // get the cluster position in local coordinates (cm) 
            LocalPoint clustlp = topol->localPosition( MeasurementPoint(xcenter, ycenter) );
            // get the cluster position in global coordinates (cm)
            GlobalPoint clustgp = theGeomDet->surface().toGlobal( clustlp );


            //barrel
            if(DetId::DetId(detId).subdetId() == static_cast<int>(PixelSubdetector::PixelBarrel)) {
              meClSizeNotOnTrack_bpix->Fill((*di).size());
              meClChargeNotOnTrack_bpix->Fill((*di).charge()/1000);
              barrelotherclusters++;
              uint32_t DBlayer = PixelBarrelName::PixelBarrelName(DetId::DetId(detId)).layerName();
              float phi = clustgp.phi(); 
              //float r = clustgp.perp();
              float z = clustgp.z();
              switch(DBlayer){
              case 1: meClPosLayer1NotOnTrack->Fill(z,phi); break;
              case 2: meClPosLayer2NotOnTrack->Fill(z,phi); break;
              case 3: meClPosLayer3NotOnTrack->Fill(z,phi); break;
                
              }
            }
            //endcap
            if(DetId::DetId(detId).subdetId() == static_cast<int>(PixelSubdetector::PixelEndcap)) {
              meClSizeNotOnTrack_fpix->Fill((*di).size());
              meClChargeNotOnTrack_fpix->Fill((*di).charge()/1000);
              endcapotherclusters++;
              uint32_t DBdisk = PixelEndcapName::PixelEndcapName(DetId::DetId(detId )).diskName();
              float x = clustgp.x(); 
              float y = clustgp.y(); 
              float z = clustgp.z();
              if(z>0){
                if(DBdisk==1) meClPosDisk1pzNotOnTrack->Fill(x,y);
                if(DBdisk==2) meClPosDisk2pzNotOnTrack->Fill(x,y); 
              }
              else{
                if(DBdisk==1) meClPosDisk1mzNotOnTrack->Fill(x,y);
                if(DBdisk==2) meClPosDisk2mzNotOnTrack->Fill(x,y); 
              } 

            }
          }     
        }
      }
    }
  }


  if(trackclusters>0) (meNofClustersOnTrack_)->Fill(0,trackclusters);
  if(barreltrackclusters>0)(meNofClustersOnTrack_)->Fill(1,barreltrackclusters);
  if(endcaptrackclusters>0)(meNofClustersOnTrack_)->Fill(2,endcaptrackclusters);
  if(otherclusters>0)(meNofClustersNotOnTrack_)->Fill(0,otherclusters);
  if(barrelotherclusters>0)(meNofClustersNotOnTrack_)->Fill(1,barrelotherclusters);
  if(endcapotherclusters>0)(meNofClustersNotOnTrack_)->Fill(2,endcapotherclusters);
  if(tracks>0)(meNofTracks_)->Fill(0,tracks);
  if(pixeltracks>0)(meNofTracks_)->Fill(1,pixeltracks);
  if(bpixtracks>0)(meNofTracks_)->Fill(2,bpixtracks);
  if(fpixtracks>0)(meNofTracks_)->Fill(3,fpixtracks);
}


DEFINE_FWK_MODULE(SiPixelTrackResidualSource); // define this as a plug-in 

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