MuonSeedOrcaPatternRecognition.cc

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#include "RecoMuon/MuonSeedGenerator/src/MuonSeedOrcaPatternRecognition.h"

#include "DataFormats/CSCRecHit/interface/CSCRecHit2DCollection.h"
#include "DataFormats/CSCRecHit/interface/CSCRecHit2D.h"
#include "DataFormats/DTRecHit/interface/DTRecSegment4DCollection.h"
#include "DataFormats/DTRecHit/interface/DTRecSegment4D.h"
#include "DataFormats/Math/interface/deltaPhi.h"
#include "DataFormats/Common/interface/Handle.h"

#include "RecoMuon/TransientTrackingRecHit/interface/MuonTransientTrackingRecHit.h"
#include "RecoMuon/TrackingTools/interface/MuonPatternRecoDumper.h"


// Geometry
#include "Geometry/CommonDetUnit/interface/GeomDet.h"
#include "TrackingTools/DetLayers/interface/DetLayer.h"

#include "RecoMuon/DetLayers/interface/MuonDetLayerGeometry.h"
#include "RecoMuon/Records/interface/MuonRecoGeometryRecord.h"

// Framework
#include "FWCore/Framework/interface/EventSetup.h"
#include "FWCore/Framework/interface/Event.h"
#include "FWCore/ParameterSet/interface/ParameterSet.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "FWCore/Framework/interface/ESHandle.h"

// C++
#include <vector>

using namespace std;

    const std::string metname = "Muon|RecoMuon|MuonSeedOrcaPatternRecognition";

// Constructor
MuonSeedOrcaPatternRecognition::MuonSeedOrcaPatternRecognition(const edm::ParameterSet& pset,edm::ConsumesCollector& iC)
: MuonSeedVPatternRecognition(pset),
  theCrackEtas(pset.getParameter<std::vector<double> >("crackEtas")),
  theCrackWindow(pset.getParameter<double>("crackWindow")),
  theDeltaPhiWindow(pset.existsAs<double>("deltaPhiSearchWindow") ? pset.getParameter<double>("deltaPhiSearchWindow") : 0.25),
  theDeltaEtaWindow(pset.existsAs<double>("deltaEtaSearchWindow") ? pset.getParameter<double>("deltaEtaSearchWindow") : 0.2),
theDeltaCrackWindow(pset.existsAs<double>("deltaEtaCrackSearchWindow") ? pset.getParameter<double>("deltaEtaCrackSearchWindow") : 0.25)
{
  muonMeasurements = new MuonDetLayerMeasurements (theDTRecSegmentLabel.label(),theCSCRecSegmentLabel,edm::InputTag(),
                           iC,
                           enableDTMeasurement,enableCSCMeasurement,false);
}


// reconstruct muon's seeds
void MuonSeedOrcaPatternRecognition::produce(const edm::Event& event, const edm::EventSetup& eSetup,
                                             std::vector<MuonRecHitContainer> & result)
{
    
  // divide the RecHits by DetLayer, in order to fill the
  // RecHitContainer like it was in ORCA
  
  // Muon Geometry - DT, CSC and RPC 
  edm::ESHandle<MuonDetLayerGeometry> muonLayers;
  eSetup.get<MuonRecoGeometryRecord>().get(muonLayers);

  // get the DT layers
  vector<const DetLayer*> dtLayers = muonLayers->allDTLayers();

  // get the CSC layers
  vector<const DetLayer*> cscForwardLayers = muonLayers->forwardCSCLayers();
  vector<const DetLayer*> cscBackwardLayers = muonLayers->backwardCSCLayers();
    
  // Backward (z<0) EndCap disk
  const DetLayer* ME4Bwd = cscBackwardLayers[4];
  const DetLayer* ME3Bwd = cscBackwardLayers[3];
  const DetLayer* ME2Bwd = cscBackwardLayers[2];
  const DetLayer* ME12Bwd = cscBackwardLayers[1];
  const DetLayer* ME11Bwd = cscBackwardLayers[0];
  
  // Forward (z>0) EndCap disk
  const DetLayer* ME11Fwd = cscForwardLayers[0];
  const DetLayer* ME12Fwd = cscForwardLayers[1];
  const DetLayer* ME2Fwd = cscForwardLayers[2];
  const DetLayer* ME3Fwd = cscForwardLayers[3];
  const DetLayer* ME4Fwd = cscForwardLayers[4];
     
  // barrel
  const DetLayer* MB4DL = dtLayers[3];
  const DetLayer* MB3DL = dtLayers[2];
  const DetLayer* MB2DL = dtLayers[1];
  const DetLayer* MB1DL = dtLayers[0];
  
  // instantiate the accessor
  // Don not use RPC for seeding

  double barreldThetaCut = 0.2;
  // still lose good muons to a tighter cut
  double endcapdThetaCut = 1.0;
  MuonRecHitContainer list9 = filterSegments(muonMeasurements->recHits(MB4DL,event), barreldThetaCut);
  MuonRecHitContainer list6 = filterSegments(muonMeasurements->recHits(MB3DL,event), barreldThetaCut);
  MuonRecHitContainer list7 = filterSegments(muonMeasurements->recHits(MB2DL,event), barreldThetaCut);
  MuonRecHitContainer list8 = filterSegments(muonMeasurements->recHits(MB1DL,event), barreldThetaCut);

  dumpLayer("MB4 ", list9);
  dumpLayer("MB3 ", list6);
  dumpLayer("MB2 ", list7);
  dumpLayer("MB1 ", list8);

  bool* MB1 = zero(list8.size());
  bool* MB2 = zero(list7.size());
  bool* MB3 = zero(list6.size());

  endcapPatterns(filterSegments(muonMeasurements->recHits(ME11Bwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME12Bwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME2Bwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME3Bwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME4Bwd,event), endcapdThetaCut),
                 list8, list7, list6,
                 MB1, MB2, MB3, result);

  endcapPatterns(filterSegments(muonMeasurements->recHits(ME11Fwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME12Fwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME2Fwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME3Fwd,event), endcapdThetaCut),
                 filterSegments(muonMeasurements->recHits(ME4Fwd,event), endcapdThetaCut),
                 list8, list7, list6,
                 MB1, MB2, MB3, result);


  // ----------    Barrel only
  
  unsigned int counter = 0;
  if ( list9.size() < 100 ) {   // +v
    for (MuonRecHitContainer::iterator iter=list9.begin(); iter!=list9.end(); iter++ ){
      MuonRecHitContainer seedSegments;
      seedSegments.push_back(*iter);
      complete(seedSegments, list6, MB3);
      complete(seedSegments, list7, MB2);
      complete(seedSegments, list8, MB1);
      if(check(seedSegments)) result.push_back(seedSegments);
    }
  }


  if ( list6.size() < 100 ) {   // +v
    for ( counter = 0; counter<list6.size(); counter++ ){
      if ( !MB3[counter] ) { 
        MuonRecHitContainer seedSegments;
        seedSegments.push_back(list6[counter]);
    complete(seedSegments, list7, MB2);
    complete(seedSegments, list8, MB1);
    complete(seedSegments, list9);
        if(check(seedSegments)) result.push_back(seedSegments);
      }
    }
  }


  if ( list7.size() < 100 ) {   // +v
    for ( counter = 0; counter<list7.size(); counter++ ){
      if ( !MB2[counter] ) { 
        MuonRecHitContainer seedSegments;
        seedSegments.push_back(list7[counter]);
    complete(seedSegments, list8, MB1);
    complete(seedSegments, list9);
    complete(seedSegments, list6, MB3);
    if (seedSegments.size()>1 || 
           (seedSegments.size()==1 && seedSegments[0]->dimension()==4) )
        {
          result.push_back(seedSegments);
    }
      }
    }
  }


  if ( list8.size() < 100 ) {   // +v
    for ( counter = 0; counter<list8.size(); counter++ ){
      if ( !MB1[counter] ) { 
        MuonRecHitContainer seedSegments;
        seedSegments.push_back(list8[counter]);
    complete(seedSegments, list9);
    complete(seedSegments, list6, MB3);
    complete(seedSegments, list7, MB2);
        if (seedSegments.size()>1 ||
           (seedSegments.size()==1 && seedSegments[0]->dimension()==4) )
        {
          result.push_back(seedSegments);
    }
      }
    }
  }

  if ( MB3 ) delete [] MB3;
  if ( MB2 ) delete [] MB2;
  if ( MB1 ) delete [] MB1;

  if(result.empty()) 
  {
    // be a little stricter with single segment seeds
    barreldThetaCut = 0.2;
    endcapdThetaCut = 0.2;

    MuonRecHitContainer all = muonMeasurements->recHits(ME4Bwd,event);
    MuonRecHitContainer tmp = filterSegments(muonMeasurements->recHits(ME3Bwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME2Bwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME12Bwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME11Bwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME11Fwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME12Fwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME2Fwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME3Fwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(ME4Fwd,event), endcapdThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(MB4DL,event), barreldThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(MB3DL,event), barreldThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(MB2DL,event), barreldThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    tmp = filterSegments(muonMeasurements->recHits(MB1DL,event), barreldThetaCut);
    copy(tmp.begin(),tmp.end(),back_inserter(all));

    LogTrace(metname)<<"Number of segments: "<<all.size();

    for(MuonRecHitContainer::const_iterator segmentItr = all.begin();
        segmentItr != all.end(); ++segmentItr)
    {
      MuonRecHitContainer singleSegmentContainer;
      singleSegmentContainer.push_back(*segmentItr);
      result.push_back(singleSegmentContainer);
    }
  }

}


bool * MuonSeedOrcaPatternRecognition::zero(unsigned listSize)
{
  bool * result = 0;
  if (listSize) {
    result = new bool[listSize]; 
    for ( size_t i=0; i<listSize; i++ ) result[i]=false;
  }
  return result;
}


void MuonSeedOrcaPatternRecognition::endcapPatterns(
  const MuonRecHitContainer & me11, const MuonRecHitContainer & me12,
  const MuonRecHitContainer & me2,  const MuonRecHitContainer & me3,
  const MuonRecHitContainer & me4,  const  MuonRecHitContainer & mb1,
  const MuonRecHitContainer & mb2,  const  MuonRecHitContainer & mb3,
  bool * MB1, bool * MB2, bool * MB3,
  std::vector<MuonRecHitContainer> & result)
{
  dumpLayer("ME4 ", me4);
  dumpLayer("ME3 ", me3);
  dumpLayer("ME2 ", me2);
  dumpLayer("ME12 ", me12);
  dumpLayer("ME11 ", me11);

  std::vector<MuonRecHitContainer> patterns;
  MuonRecHitContainer crackSegments;
  rememberCrackSegments(me11, crackSegments);
  rememberCrackSegments(me12, crackSegments);
  rememberCrackSegments(me2,  crackSegments);
  rememberCrackSegments(me3,  crackSegments);
  rememberCrackSegments(me4,  crackSegments);


  MuonRecHitContainer list24 = me4;
  MuonRecHitContainer list23 = me3;

  MuonRecHitContainer list12 = me2;

  MuonRecHitContainer list22 = me12;
  MuonRecHitContainer list21 = me11;

  MuonRecHitContainer list11 = list21;
  MuonRecHitContainer list5 = list22;
  MuonRecHitContainer list13 = list23;
  MuonRecHitContainer list4 = list24;

  if ( list21.size() == 0 )  {
    list11 = list22; list5 = list21;
  }

  if ( list24.size() < list23.size() && list24.size() > 0 )  {
    list13 = list24; list4 = list23;
  }

  if ( list23.size() == 0 )  {
    list13 = list24; list4 = list23;
  }

  MuonRecHitContainer list1 = list11;
  MuonRecHitContainer list2 = list12;
  MuonRecHitContainer list3 = list13;


  if ( list12.size() == 0 )  {
    list3 = list12;
    if ( list11.size() <= list13.size() && list11.size() > 0 ) {
      list1 = list11; list2 = list13;}
    else { list1 = list13; list2 = list11;}
  }

  if ( list13.size() == 0 )  {
    if ( list11.size() <= list12.size() && list11.size() > 0 ) {
      list1 = list11; list2 = list12;}
    else { list1 = list12; list2 = list11;}
  }

  if ( list12.size() != 0 &&  list13.size() != 0 )  {
    if ( list11.size()<=list12.size() && list11.size()<=list13.size() && list11.size()>0 ) {   // ME 1
      if ( list12.size() > list13.size() ) {
        list2 = list13; list3 = list12;}
    }
    else if ( list12.size() <= list13.size() ) {                                   //  start with ME 2
      list1 = list12;
      if ( list11.size() <= list13.size() && list11.size() > 0 ) {
        list2 = list11; list3 = list13;}
      else { list2 = list13; list3 = list11;}
    }
    else {                                                                         //  start with ME 3
      list1 = list13;
      if ( list11.size() <= list12.size() && list11.size() > 0 ) {
        list2 = list11; list3 = list12;}
      else { list2 = list12; list3 = list11;}
    }
  }


  bool* ME2 = zero(list2.size());
  bool* ME3 = zero(list3.size());
  bool* ME4 = zero(list4.size());
  bool* ME5 = zero(list5.size());


  // creates list of compatible track segments

  for (MuonRecHitContainer::iterator iter = list1.begin(); iter!=list1.end(); iter++ ){
    if ( (*iter)->recHits().size() < 4 && list3.size() > 0 ) continue; // 3p.tr-seg. are not so good for starting
    MuonRecHitContainer seedSegments;
    seedSegments.push_back(*iter);
    complete(seedSegments, list2, ME2);
    complete(seedSegments, list3, ME3);
    complete(seedSegments, list4, ME4);
    complete(seedSegments, list5, ME5);
    complete(seedSegments, mb3, MB3);
    complete(seedSegments, mb2, MB2);
    complete(seedSegments, mb1, MB1);
    if(check(seedSegments)) patterns.push_back(seedSegments);
  }


  unsigned int counter;

  for ( counter = 0; counter<list2.size(); counter++ ){

    if ( !ME2[counter] ) {
      MuonRecHitContainer seedSegments;
      seedSegments.push_back(list2[counter]);
      complete(seedSegments, list3, ME3);
      complete(seedSegments, list4, ME4);
      complete(seedSegments, list5, ME5);
      complete(seedSegments, mb3, MB3);
      complete(seedSegments, mb2, MB2);
      complete(seedSegments, mb1, MB1);
      if(check(seedSegments)) patterns.push_back(seedSegments);
    }
  }


  if ( list3.size() < 20 ) {   // +v
    for ( counter = 0; counter<list3.size(); counter++ ){
      if ( !ME3[counter] ) {
        MuonRecHitContainer seedSegments;
        seedSegments.push_back(list3[counter]);
        complete(seedSegments, list4, ME4);
        complete(seedSegments, list5, ME5);
        complete(seedSegments, mb3, MB3);
        complete(seedSegments, mb2, MB2);
        complete(seedSegments, mb1, MB1);
        if(check(seedSegments)) patterns.push_back(seedSegments);
      }
    }
  }

  if ( list4.size() < 20 ) {   // +v
    for ( counter = 0; counter<list4.size(); counter++ ){
      if ( !ME4[counter] ) {
        MuonRecHitContainer seedSegments;
        seedSegments.push_back(list4[counter]);
        complete(seedSegments, list5, ME5);
        complete(seedSegments, mb3, MB3);
        complete(seedSegments, mb2, MB2);
        complete(seedSegments, mb1, MB1);
        if(check(seedSegments)) patterns.push_back(seedSegments);
      }
    }
  }

  if ( ME5 ) delete [] ME5;
  if ( ME4 ) delete [] ME4;
  if ( ME3 ) delete [] ME3;
  if ( ME2 ) delete [] ME2;

  if(!patterns.empty())
  {
    result.insert(result.end(), patterns.begin(), patterns.end());
  }
  else
  {
    if(!crackSegments.empty())
    {
       // make some single-segment seeds
       for(MuonRecHitContainer::const_iterator crackSegmentItr = crackSegments.begin();
           crackSegmentItr != crackSegments.end(); ++crackSegmentItr)
       {
          MuonRecHitContainer singleSegmentPattern;
          singleSegmentPattern.push_back(*crackSegmentItr);
          result.push_back(singleSegmentPattern);
       }
    }
  }
}



void MuonSeedOrcaPatternRecognition::complete(MuonRecHitContainer& seedSegments,
                                 const MuonRecHitContainer &recHits, bool* used) const {

  MuonRecHitContainer good_rhit;
  MuonPatternRecoDumper theDumper;
  //+v get all rhits compatible with the seed on dEta/dPhi Glob.

  ConstMuonRecHitPointer first = seedSegments[0]; // first rechit of seed

  GlobalPoint ptg2 = first->globalPosition(); // its global pos +v

  for (unsigned nr = 0; nr < recHits.size(); ++nr ){
    MuonRecHitPointer recHit(recHits[nr]);
    GlobalPoint ptg1(recHit->globalPosition());
    float deta = fabs (ptg1.eta()-ptg2.eta());
    // Geom::Phi should keep it in the range [-pi, pi]
    float dphi = fabs( deltaPhi(ptg1.phi(), ptg2.phi()) );
    // be a little more lenient in cracks
    bool crack = isCrack(recHit) || isCrack(first);
    //float detaWindow = 0.3;
    float detaWindow = crack ? theDeltaCrackWindow : theDeltaEtaWindow;
    if ( deta > detaWindow || dphi > theDeltaPhiWindow ) {
      continue;
    }   // +vvp!!!

    good_rhit.push_back(recHit);
    if (used) markAsUsed(nr, recHits, used);
  }  // recHits iter

  // select the best rhit among the compatible ones (based on Dphi Glob & Dir)
  MuonRecHitPointer best=bestMatch(first, good_rhit);
  if(best && best->isValid() ) seedSegments.push_back(best);
}



MuonSeedOrcaPatternRecognition::MuonRecHitPointer
MuonSeedOrcaPatternRecognition::bestMatch(const ConstMuonRecHitPointer & first,
                                          MuonRecHitContainer & good_rhit) const
{
  MuonRecHitPointer best = 0;
  if(good_rhit.size() == 1) return good_rhit[0];
  double bestDiscrim = 10000.;
  for (MuonRecHitContainer::iterator iter=good_rhit.begin(); 
       iter!=good_rhit.end(); iter++)
  {
    double discrim = discriminator(first, *iter);
    if(discrim < bestDiscrim)
    {
      bestDiscrim = discrim;
      best = *iter;
    }
  }
  return best;
}


double MuonSeedOrcaPatternRecognition::discriminator(const ConstMuonRecHitPointer & first, MuonRecHitPointer & other) const
{
  GlobalPoint gp1= first->globalPosition();
  GlobalPoint gp2= other->globalPosition();
  GlobalVector gd1 = first->globalDirection();
  GlobalVector gd2 = other->globalDirection();
  if(first->isDT() || other->isDT()) {
    return fabs(deltaPhi(gd1.phi(), gd2.phi()));
  }

  // penalize those 3-hit segments
  int nhits = other->recHits().size();
  int penalty = std::max(nhits-2, 1);
  float dphig = deltaPhi(gp1.phi(), gp2.phi());
  // ME1A has slanted wires, so matching theta position doesn't work well.
  if(isME1A(first) || isME1A(other)) {
    return fabs(dphig/penalty);
  }

  float dthetag = gp1.theta()-gp2.theta();
  float dphid2 = fabs(deltaPhi(gd2.phi(), gp2.phi()));
  if (dphid2 > M_PI*.5) dphid2 = M_PI - dphid2;  //+v
  float dthetad2 = gp2.theta()-gd2.theta();
  // for CSC, make a big chi-squared of relevant variables
  // FIXME for 100 GeV mnd above muons, this doesn't perform as well as
  // previous methods.  needs investigation.
  float chisq =  ((dphig/0.02)*(dphig/0.02)
                + (dthetag/0.003)*(dthetag/0.003)
                + (dphid2/0.06)*(dphid2/0.06)
                + (dthetad2/0.08)*(dthetad2/0.08)
                );
  return chisq / penalty;
}


bool MuonSeedOrcaPatternRecognition::check(const MuonRecHitContainer & segments)
{
  return (segments.size() > 1);
}


void MuonSeedOrcaPatternRecognition::markAsUsed(int nr, const MuonRecHitContainer &recHits, bool* used) const
{
  used[nr] = true;
  // if it's ME1A with two other segments in the container, mark the ghosts as used, too.
  if(recHits[nr]->isCSC())
  {
    CSCDetId detId(recHits[nr]->geographicalId().rawId());
    if(detId.ring() == 4)
    {
      std::vector<unsigned> chamberHitNs;
      for(unsigned i = 0; i < recHits.size(); ++i)
      {
        if(recHits[i]->geographicalId().rawId() == detId.rawId())
        {
          chamberHitNs.push_back(i);
        }
      }
      if(chamberHitNs.size() == 3)
      {
        for(unsigned i = 0; i < 3; ++i)
        {
          used[chamberHitNs[i]] = true;
        }
      }
    }
  }
}


bool MuonSeedOrcaPatternRecognition::isCrack(const ConstMuonRecHitPointer & segment) const
{
  bool result = false;
  double absEta = fabs(segment->globalPosition().eta());
  for(std::vector<double>::const_iterator crackItr = theCrackEtas.begin();
      crackItr != theCrackEtas.end(); ++crackItr)
  {
    if(fabs(absEta-*crackItr) < theCrackWindow) {
      result = true;
    }
  }
  return result;
}


void MuonSeedOrcaPatternRecognition::rememberCrackSegments(const MuonRecHitContainer & segments,
                                                           MuonRecHitContainer & crackSegments) const
{
  for(MuonRecHitContainer::const_iterator segmentItr = segments.begin(); 
      segmentItr != segments.end(); ++segmentItr)
  {
    if((**segmentItr).hit()->dimension() == 4 && isCrack(*segmentItr)) 
    {
       crackSegments.push_back(*segmentItr);
    }
  }
}



void MuonSeedOrcaPatternRecognition::dumpLayer(const char * name, const MuonRecHitContainer & segments) const
{
  MuonPatternRecoDumper theDumper;

  LogTrace(metname) << name << std::endl;
  for(MuonRecHitContainer::const_iterator segmentItr = segments.begin();
      segmentItr != segments.end(); ++segmentItr)
  {
    LogTrace(metname) << theDumper.dumpMuonId((**segmentItr).geographicalId());
  }
}


MuonSeedOrcaPatternRecognition::MuonRecHitContainer 
MuonSeedOrcaPatternRecognition::filterSegments(const MuonRecHitContainer & segments, double dThetaCut) const
{
MuonPatternRecoDumper theDumper;
  MuonRecHitContainer result;
  for(MuonRecHitContainer::const_iterator segmentItr = segments.begin();
      segmentItr != segments.end(); ++segmentItr)
  {
    double dtheta = (*segmentItr)->globalDirection().theta() -  (*segmentItr)->globalPosition().theta();
    if((*segmentItr)->isDT())
    {
      // only apply the cut to 4D segments
      if((*segmentItr)->dimension() == 2 || fabs(dtheta) < dThetaCut)
      {
        result.push_back(*segmentItr);
      }
      else 
      {
        LogTrace(metname) << "Cutting segment " << theDumper.dumpMuonId((**segmentItr).geographicalId()) << " because dtheta = " << dtheta;
      }

    }
    else if((*segmentItr)->isCSC()) 
    {
      if(fabs(dtheta) < dThetaCut)
      {
        result.push_back(*segmentItr);
      }
      else 
      {
         LogTrace(metname) << "Cutting segment " << theDumper.dumpMuonId((**segmentItr).geographicalId()) << " because dtheta = " << dtheta;
      }
    }
  }
  filterOverlappingChambers(result);
  return result;
}


void MuonSeedOrcaPatternRecognition::filterOverlappingChambers(MuonRecHitContainer & segments) const
{
  if(segments.empty()) return;
  MuonPatternRecoDumper theDumper;
  // need to optimize cuts
  double dphiCut = 0.05;
  double detaCut = 0.05;
  std::vector<unsigned> toKill;
  std::vector<unsigned> me1aOverlaps;
  // loop over all segment pairs to see if there are two that match up in eta and phi
  // but from different chambers
  unsigned nseg = segments.size();
  for(unsigned i = 0; i < nseg-1; ++i)
  {
    GlobalPoint pg1 = segments[i]->globalPosition();
    for(unsigned j = i+1; j < nseg; ++j)
    {
      GlobalPoint pg2 = segments[j]->globalPosition();
      if(segments[i]->geographicalId().rawId() != segments[j]->geographicalId().rawId()
         && fabs(deltaPhi(pg1.phi(), pg2.phi())) < dphiCut
         && fabs(pg1.eta()-pg2.eta()) < detaCut)
      {
        LogTrace(metname) << "OVERLAP " << theDumper.dumpMuonId(segments[i]->geographicalId()) << " " <<
                                   theDumper.dumpMuonId(segments[j]->geographicalId());
        // see which one is best
        toKill.push_back( (countHits(segments[i]) < countHits(segments[j])) ? i : j);
        if(isME1A(segments[i]))
        {
          me1aOverlaps.push_back(i);
          me1aOverlaps.push_back(j);
        }
      }
    }
  }

  if(toKill.empty()) return;

  // try to kill ghosts assigned to overlaps
  for(unsigned i = 0; i < me1aOverlaps.size(); ++i)
  {
    DetId detId(segments[me1aOverlaps[i]]->geographicalId());
    vector<unsigned> inSameChamber;
    for(unsigned j = 0; j < nseg; ++j)
    {
      if(i != j && segments[j]->geographicalId() == detId)
      {
        inSameChamber.push_back(j);
      }
    }
    if(inSameChamber.size() == 2)
    {
      toKill.push_back(inSameChamber[0]);
      toKill.push_back(inSameChamber[1]);
    }
  }
  // now kill the killable
  MuonRecHitContainer result;
  for(unsigned i = 0; i < nseg; ++i)
  {
    if(std::find(toKill.begin(), toKill.end(), i) == toKill.end())
    {
      result.push_back(segments[i]);
    }
   
  }
  segments.swap(result);
}


bool MuonSeedOrcaPatternRecognition::isME1A(const ConstMuonRecHitPointer & segment) const
{
  return segment->isCSC() && CSCDetId(segment->geographicalId()).ring() == 4;
}


int MuonSeedOrcaPatternRecognition::countHits(const MuonRecHitPointer & segment) const {
  int count = 0;
  vector<TrackingRecHit*> components = (*segment).recHits();
  for(vector<TrackingRecHit*>::const_iterator component = components.begin();
      component != components.end(); ++component)
  {
    int componentSize = (**component).recHits().size();
    count += (componentSize == 0) ? 1 : componentSize;
  }
  return count;
}