CSCHaloAlgo.cc

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#include "RecoMET/METAlgorithms/interface/CSCHaloAlgo.h"
#include "FWCore/Common/interface/TriggerNames.h"
/*
  [class]:  CSCHaloAlgo
  [authors]: R. Remington, The University of Florida
  [description]: See CSCHaloAlgo.h
  [date]: October 15, 2009
*/
using namespace reco;
using namespace std;
using namespace edm;
#include "TMath.h"
namespace {
  constexpr float c_cm_per_ns  = 29.9792458;
};
CSCHaloAlgo::CSCHaloAlgo() : geo_(nullptr), hgeo_(nullptr)
{
  deta_threshold = 0.;
  min_inner_radius = 0.;
  max_inner_radius = 9999.;
  min_outer_radius = 0.;
  max_outer_radius = 9999.;
  dphi_threshold = 999.;
  norm_chi2_threshold = 999.;
  recHit_t0=0.;
  recHit_twindow=25.;
  expected_BX=3;
  max_dt_muon_segment=-10.0;
  max_free_inverse_beta=0.0;
  
  min_outer_theta = 0.;
  max_outer_theta = TMath::Pi();
  
  matching_dphi_threshold = 0.18; //radians
  matching_deta_threshold = 0.4;
  matching_dwire_threshold = 5.;


  et_thresh_rh_hbhe=25; //GeV
  et_thresh_rh_ee=10; 
  et_thresh_rh_eb=10; 

  dphi_thresh_segvsrh_hbhe=0.05; //radians
  dphi_thresh_segvsrh_eb=0.05;
  dphi_thresh_segvsrh_ee=0.05; 

  dr_lowthresh_segvsrh_hbhe=-20; //cm
  dr_lowthresh_segvsrh_eb=-20; 
  dr_lowthresh_segvsrh_ee=-20;

  dr_highthresh_segvsrh_hbhe=20; //cm
  dr_highthresh_segvsrh_eb=20; 
  dr_highthresh_segvsrh_ee=20;

  dt_lowthresh_segvsrh_hbhe=5;//ns
  dt_lowthresh_segvsrh_eb=5;
  dt_lowthresh_segvsrh_ee=5;

  dt_highthresh_segvsrh_hbhe=30;//ns
  dt_highthresh_segvsrh_eb=30;
  dt_highthresh_segvsrh_ee=30;


  
}

reco::CSCHaloData CSCHaloAlgo::Calculate(const CSCGeometry& TheCSCGeometry,
                     edm::Handle<reco::MuonCollection>& TheCosmicMuons,  
                     const edm::Handle<reco::MuonTimeExtraMap> TheCSCTimeMap,
                     edm::Handle<reco::MuonCollection>& TheMuons,
                     edm::Handle<CSCSegmentCollection>& TheCSCSegments, 
                     edm::Handle<CSCRecHit2DCollection>& TheCSCRecHits,
                     edm::Handle < L1MuGMTReadoutCollection >& TheL1GMTReadout,
                     edm::Handle<HBHERecHitCollection>& hbhehits,
                     edm::Handle<EcalRecHitCollection>& ecalebhits,
                     edm::Handle<EcalRecHitCollection>& ecaleehits,
                     edm::Handle<edm::TriggerResults>& TheHLTResults,
                     const edm::TriggerNames * triggerNames, 
                     const edm::Handle<CSCALCTDigiCollection>& TheALCTs,
                     MuonSegmentMatcher *TheMatcher,  
                     const edm::Event& TheEvent,
                     const edm::EventSetup& TheSetup)
{
  reco::CSCHaloData TheCSCHaloData;
  int imucount=0;
  
  bool calomatched =false;
  bool ECALBmatched =false;
  bool ECALEmatched =false;
  bool HCALmatched =false;

  edm::ESHandle<CaloGeometry> pGeo;
  TheSetup.get<CaloGeometryRecord>().get(pGeo);
  geo_  = pGeo.product();
  hgeo_ = dynamic_cast<const HcalGeometry*>(geo_->getSubdetectorGeometry(DetId::Hcal, 1));

  //}
  bool trkmuunvetoisdefault = false; //Pb with low pt tracker muons that veto good csc segments/halo triggers. 
  //Test to "unveto" low pt trk muons. 
  //For now, we just recalculate everything without the veto and add an extra set of variables to the class CSCHaloData. 
  //If this is satisfactory, these variables can become the default ones by setting trkmuunvetoisdefault to true. 
  if( TheCosmicMuons.isValid() )
    {
      short int n_tracks_small_beta=0;
      short int n_tracks_small_dT=0;
      short int n_tracks_small_dT_and_beta=0;
      for( reco::MuonCollection::const_iterator iMuon = TheCosmicMuons->begin() ; iMuon != TheCosmicMuons->end() ; iMuon++, imucount++ )
    {
      reco::TrackRef Track = iMuon->outerTrack();
      if(!Track) continue;

      bool StoreTrack = false;
      // Calculate global phi coordinate for central most rechit in the track
      float innermost_global_z = 1500.;
      float outermost_global_z = 0.;
      GlobalPoint InnerMostGlobalPosition(0.,0.,0.);  // smallest abs(z)
      GlobalPoint OuterMostGlobalPosition(0.,0.,0.);  // largest abs(z)
      int nCSCHits = 0;
      for(unsigned int j = 0 ; j < Track->extra()->recHitsSize(); j++ )
        {
          auto hit = Track->extra()->recHitRef(j);
          if( !hit->isValid() ) continue;
          DetId TheDetUnitId(hit->geographicalId());
          if( TheDetUnitId.det() != DetId::Muon ) continue;
          if( TheDetUnitId.subdetId() != MuonSubdetId::CSC ) continue;

          const GeomDetUnit *TheUnit = TheCSCGeometry.idToDetUnit(TheDetUnitId);
          LocalPoint TheLocalPosition = hit->localPosition();  
          const BoundPlane& TheSurface = TheUnit->surface();
          const GlobalPoint TheGlobalPosition = TheSurface.toGlobal(TheLocalPosition);

          float z = TheGlobalPosition.z();
          if( abs(z) < innermost_global_z )
        {
          innermost_global_z = abs(z);
          InnerMostGlobalPosition = GlobalPoint( TheGlobalPosition);
        }
          if( abs(z) > outermost_global_z )
        {
          outermost_global_z = abs(z);
          OuterMostGlobalPosition = GlobalPoint( TheGlobalPosition );
        }
          nCSCHits ++;
        }

      std::vector<const CSCSegment*> MatchedSegments = TheMatcher->matchCSC(*Track,TheEvent);
      // Find the inner and outer segments separately in case they don't agree completely with recHits
      // Plan for the possibility segments in both endcaps
      float InnerSegmentTime[2] = {0,0};
      float OuterSegmentTime[2] = {0,0};
      float innermost_seg_z[2] = {1500,1500};
      float outermost_seg_z[2] = {0,0};
      for (std::vector<const CSCSegment*>::const_iterator segment =MatchedSegments.begin();
           segment != MatchedSegments.end(); ++segment)
        {
          CSCDetId TheCSCDetId((*segment)->cscDetId());
          const CSCChamber* TheCSCChamber = TheCSCGeometry.chamber(TheCSCDetId);
          LocalPoint TheLocalPosition = (*segment)->localPosition();
          const GlobalPoint TheGlobalPosition = TheCSCChamber->toGlobal(TheLocalPosition);
          float z = TheGlobalPosition.z();
          int TheEndcap = TheCSCDetId.endcap();
          if( abs(z) < innermost_seg_z[TheEndcap-1] )
        {
          innermost_seg_z[TheEndcap-1] = abs(z);
          InnerSegmentTime[TheEndcap-1] = (*segment)->time();
        }
          if( abs(z) > outermost_seg_z[TheEndcap-1] )
        {
          outermost_seg_z[TheEndcap-1] = abs(z);
          OuterSegmentTime[TheEndcap-1] = (*segment)->time();
        }
        }

      if( nCSCHits < 3 ) continue; // This needs to be optimized, but is the minimum 

      float dT_Segment = 0; // default safe value, looks like collision muon
     
      if( innermost_seg_z[0] < outermost_seg_z[0]) // two segments in ME+
        dT_Segment =  OuterSegmentTime[0]-InnerSegmentTime[0];
      if( innermost_seg_z[1] < outermost_seg_z[1]) // two segments in ME-
        {
          // replace the measurement if there weren't segments in ME+ or
          // if the track in ME- has timing more consistent with an incoming particle
          if (dT_Segment == 0.0 ||  OuterSegmentTime[1]-InnerSegmentTime[1] < dT_Segment)
        dT_Segment = OuterSegmentTime[1]-InnerSegmentTime[1] ;
        }

      if( OuterMostGlobalPosition.x() == 0. || OuterMostGlobalPosition.y() == 0. || OuterMostGlobalPosition.z() == 0. ) 
        continue;
      if( InnerMostGlobalPosition.x() == 0. || InnerMostGlobalPosition.y() == 0. || InnerMostGlobalPosition.z() == 0. )
        continue;
      
      //Its a CSC Track,store it if it passes halo selection 
      StoreTrack = true;      

      float deta = abs( OuterMostGlobalPosition.eta() - InnerMostGlobalPosition.eta() );
      float dphi = abs(deltaPhi( OuterMostGlobalPosition.barePhi() , InnerMostGlobalPosition.barePhi() )) ;
      float theta = Track->outerMomentum().theta();
      float innermost_x = InnerMostGlobalPosition.x() ;
      float innermost_y = InnerMostGlobalPosition.y();
      float outermost_x = OuterMostGlobalPosition.x();
      float outermost_y = OuterMostGlobalPosition.y();
      float innermost_r = TMath::Sqrt(innermost_x *innermost_x + innermost_y * innermost_y );
      float outermost_r = TMath::Sqrt(outermost_x *outermost_x + outermost_y * outermost_y );
      
      if( deta < deta_threshold )
        StoreTrack = false;
      if( theta > min_outer_theta && theta < max_outer_theta )
        StoreTrack = false;
      if( dphi > dphi_threshold )
        StoreTrack = false;
      if( innermost_r < min_inner_radius )
        StoreTrack = false;
      if( innermost_r > max_inner_radius )
        StoreTrack = false;
      if( outermost_r < min_outer_radius )
        StoreTrack = false;
      if( outermost_r > max_outer_radius )
        StoreTrack  = false;
      if( Track->normalizedChi2() > norm_chi2_threshold )
        StoreTrack = false;

      if( StoreTrack )
        {
          TheCSCHaloData.GetCSCTrackImpactPositions().push_back( InnerMostGlobalPosition );
          TheCSCHaloData.GetTracks().push_back( Track );
        }

      // Analyze the MuonTimeExtra information
      if( TheCSCTimeMap.isValid() ) 
        {
          reco::MuonRef muonR(TheCosmicMuons,imucount);
          const reco::MuonTimeExtraMap & timeMapCSC = *TheCSCTimeMap;
          reco::MuonTimeExtra timecsc = timeMapCSC[muonR];
          float freeInverseBeta = timecsc.freeInverseBeta();
          
          if (dT_Segment < max_dt_muon_segment )
        n_tracks_small_dT++;
          if (freeInverseBeta < max_free_inverse_beta)
        n_tracks_small_beta++;
          if ((dT_Segment < max_dt_muon_segment) &&  (freeInverseBeta < max_free_inverse_beta))
        n_tracks_small_dT_and_beta++;
        }
      else 
           {
          static std::atomic<bool> MuonTimeFail{false};
              bool expected = false;
          if( MuonTimeFail.compare_exchange_strong(expected,true,std::memory_order_acq_rel) ) 
        {
          edm::LogWarning  ("InvalidInputTag") <<  "The MuonTimeExtraMap does not appear to be in the event. Some beam halo "
                               << " identification variables will be empty" ;
        }
        }
    }
      TheCSCHaloData.SetNIncomingTracks(n_tracks_small_dT,n_tracks_small_beta,n_tracks_small_dT_and_beta);
    }
  else // collection is invalid
    {
      static std::atomic<bool> CosmicFail{false};
      bool expected = false;
      if( CosmicFail.compare_exchange_strong(expected,true,std::memory_order_acq_rel) ) 
    {
      edm::LogWarning  ("InvalidInputTag") << " The Cosmic Muon collection does not appear to be in the event. These beam halo "
                           << " identification variables will be empty" ;
    }
    }


   // Loop over the CSCRecHit2D collection to look for out-of-time recHits
   // Out-of-time is defined as tpeak outside [t_0 + TOF - t_window, t_0 + TOF + t_window]
   // where t_0 and t_window are configurable parameters
   short int n_recHitsP = 0;
   short int n_recHitsM = 0;
   if( TheCSCRecHits.isValid() )
     {
       CSCRecHit2DCollection::const_iterator dRHIter;
       for (dRHIter = TheCSCRecHits->begin(); dRHIter != TheCSCRecHits->end(); dRHIter++) 
     {
       if ( !((*dRHIter).isValid()) ) continue;  // only interested in valid hits
       CSCDetId idrec = (CSCDetId)(*dRHIter).cscDetId();
       float RHTime = (*dRHIter).tpeak();
       LocalPoint rhitlocal = (*dRHIter).localPosition();
       const CSCChamber* chamber = TheCSCGeometry.chamber(idrec);
       GlobalPoint globalPosition = chamber->toGlobal(rhitlocal);
       float globZ = globalPosition.z();
       if ( RHTime < (recHit_t0 - recHit_twindow) )
         {
           if( globZ > 0 )
         n_recHitsP++;
           else
         n_recHitsM++;
         }
       
       /*

       float globX = globalPosition.x();
       float globY = globalPosition.y();
       float globZ = globalPosition.z();
       float TOF = (sqrt(globX*globX+ globY*globY + globZ*globZ))/29.9792458 ; //cm -> ns
       if ( (RHTime < (recHit_t0 + TOF - recHit_twindow)) || (RHTime > (recHit_t0 + TOF + recHit_twindow)) )
         {
           if( globZ > 0 ) 
         n_recHitsP++;
           else
         n_recHitsM++;
         }
       */
     }
     }
   else
     {
       static std::atomic<bool> RecHitFail{false};
       bool expected = false;
       if( RecHitFail.compare_exchange_strong(expected,true,std::memory_order_acq_rel)  ) 
     {
       edm::LogWarning  ("InvalidInputTag") << "The requested CSCRecHit2DCollection does not appear to be in the event. The CSC RecHit "
                        << " variables used for halo identification will not be calculated or stored";
     }       
     }
   TheCSCHaloData.SetNOutOfTimeHits(n_recHitsP+n_recHitsM);
   // MLR
   // Loop through CSCSegments and count the number of "flat" segments with the same (r,phi),
   // saving the value in TheCSCHaloData.
   short int maxNSegments = 0;
   bool plus_endcap = false;
   bool minus_endcap = false;
   bool both_endcaps = false;
   bool both_endcaps_loose = false;
   //   bool both_endcaps_dtcut = false;

   short int maxNSegments_alt = 0;
   bool both_endcaps_alt = false;
   bool both_endcaps_loose_alt = false;
   bool both_endcaps_loose_dtcut_alt = false;

   //float r = 0., phi = 0.;
   if (TheCSCSegments.isValid()) {
     for(CSCSegmentCollection::const_iterator iSegment = TheCSCSegments->begin();
         iSegment != TheCSCSegments->end();
         iSegment++) {

       CSCDetId iCscDetID = iSegment->cscDetId();
       bool Segment1IsGood=true;
       bool Segment1IsGood_alt=true;

       //avoid segments from collision muons
       if( TheMuons.isValid() )
     {
       for(reco::MuonCollection::const_iterator mu = TheMuons->begin(); mu!= TheMuons->end() && (Segment1IsGood||!trkmuunvetoisdefault)   ; mu++ )
         {
           bool  lowpttrackmu=false;
           if( !mu->isTrackerMuon() && !mu->isGlobalMuon() && mu->isStandAloneMuon() ) continue;
           if( !mu->isTrackerMuon() && !mu->isGlobalMuon() && mu->isStandAloneMuon()&&trkmuunvetoisdefault) continue;
           if( !mu->isGlobalMuon() &&  mu->isTrackerMuon() &&  mu->pt()<3) lowpttrackmu=true;
           const std::vector<MuonChamberMatch> chambers = mu->matches();
           for(std::vector<MuonChamberMatch>::const_iterator kChamber = chambers.begin();
           kChamber != chambers.end(); kChamber ++ )
         {
           if( kChamber->detector() != MuonSubdetId::CSC ) continue;
           for( std::vector<reco::MuonSegmentMatch>::const_iterator kSegment = kChamber->segmentMatches.begin();
            kSegment != kChamber->segmentMatches.end(); kSegment++ )
             {
               edm::Ref<CSCSegmentCollection> cscSegRef = kSegment->cscSegmentRef;
               CSCDetId kCscDetID = cscSegRef->cscDetId();
               
               if( kCscDetID == iCscDetID ) 
             {
               Segment1IsGood = false;
               if(!lowpttrackmu) Segment1IsGood_alt=false;
             }
             }
         }
         }
     }
       if(!Segment1IsGood&&!Segment1IsGood_alt) continue;
       
       // Get local direction vector; if direction runs parallel to beamline,
       // count this segment as beam halo candidate.
       LocalPoint iLocalPosition = iSegment->localPosition();
       LocalVector iLocalDirection = iSegment->localDirection();

       GlobalPoint iGlobalPosition = TheCSCGeometry.chamber(iCscDetID)->toGlobal(iLocalPosition);
       GlobalVector iGlobalDirection = TheCSCGeometry.chamber(iCscDetID)->toGlobal(iLocalDirection);

       float iTheta = iGlobalDirection.theta();
       if (iTheta > max_segment_theta && iTheta < TMath::Pi() - max_segment_theta) continue;
       
       float iPhi = iGlobalPosition.phi();
       float iR =  TMath::Sqrt(iGlobalPosition.x()*iGlobalPosition.x() + iGlobalPosition.y()*iGlobalPosition.y());
       float iZ = iGlobalPosition.z();
       float iT = iSegment->time();

       //       if(abs(iZ)<650&& TheEvent.id().run()< 251737) iT-= 25; 
       //Calo matching:

       bool hbhematched = HCALSegmentMatching(hbhehits,et_thresh_rh_hbhe,dphi_thresh_segvsrh_hbhe,dr_lowthresh_segvsrh_hbhe,dr_highthresh_segvsrh_hbhe,dt_lowthresh_segvsrh_hbhe,dt_highthresh_segvsrh_hbhe,iZ,iR,iT,iPhi);
       bool ebmatched = ECALSegmentMatching(ecalebhits,et_thresh_rh_eb,dphi_thresh_segvsrh_eb,dr_lowthresh_segvsrh_eb,dr_highthresh_segvsrh_eb,dt_lowthresh_segvsrh_eb,dt_highthresh_segvsrh_eb,iZ,iR,iT,iPhi);
       bool eematched = ECALSegmentMatching(ecaleehits,et_thresh_rh_ee,dphi_thresh_segvsrh_ee,dr_lowthresh_segvsrh_ee,dr_highthresh_segvsrh_ee,dt_lowthresh_segvsrh_ee,dt_highthresh_segvsrh_ee,iZ,iR,iT,iPhi); 
       calomatched  |= (hbhematched || ebmatched || eematched);
       HCALmatched  |= hbhematched;
       ECALBmatched |= ebmatched;
       ECALEmatched |= eematched;

       short int nSegs = 0;
       short int nSegs_alt = 0;
       // Changed to loop over all Segments (so N^2) to catch as many segments as possible.
       for (CSCSegmentCollection::const_iterator jSegment = TheCSCSegments->begin();
         jSegment != TheCSCSegments->end();
         jSegment++) {
     if (jSegment == iSegment) continue;
     bool Segment2IsGood = true;
     bool Segment2IsGood_alt = true;
     LocalPoint jLocalPosition = jSegment->localPosition();
     LocalVector jLocalDirection = jSegment->localDirection();
     CSCDetId jCscDetID = jSegment->cscDetId();
     GlobalPoint jGlobalPosition = TheCSCGeometry.chamber(jCscDetID)->toGlobal(jLocalPosition);
     GlobalVector jGlobalDirection = TheCSCGeometry.chamber(jCscDetID)->toGlobal(jLocalDirection);
     float jTheta = jGlobalDirection.theta();
     float jPhi = jGlobalPosition.phi();
     float jR =  TMath::Sqrt(jGlobalPosition.x()*jGlobalPosition.x() + jGlobalPosition.y()*jGlobalPosition.y());
     float jZ = jGlobalPosition.z() ;
     float jT = jSegment->time();
     //  if(abs(jZ)<650&& TheEvent.id().run() < 251737)jT-= 25;
     if (  std::abs(deltaPhi(jPhi , iPhi)) <=max_segment_phi_diff
           && ( std::abs(jR - iR) <0.05*std::abs(jZ - iZ)||  jZ*iZ>0 )
           && ( (jR - iR) >-0.02*std::abs(jZ - iZ) || iT>jT ||  jZ*iZ>0)
           && ( (iR - jR) >-0.02*std::abs(jZ - iZ) || iT<jT ||  jZ*iZ>0)
           && (std::abs(jR - iR) <= max_segment_r_diff ||  jZ*iZ < 0)
           && (jTheta < max_segment_theta || jTheta > TMath::Pi() - max_segment_theta)) {
       if( TheMuons.isValid() ) {
         for(reco::MuonCollection::const_iterator mu = TheMuons->begin(); mu!= TheMuons->end()  && (Segment2IsGood||!trkmuunvetoisdefault) ; mu++ ) {
           bool  lowpttrackmu=false;
           if( !mu->isTrackerMuon() && !mu->isGlobalMuon() && mu->isStandAloneMuon() ) continue;
           if( !mu->isGlobalMuon() &&  mu->isTrackerMuon() &&  mu->pt()<3) lowpttrackmu= true;
           const std::vector<MuonChamberMatch> chambers = mu->matches();
           for(std::vector<MuonChamberMatch>::const_iterator kChamber = chambers.begin();
           kChamber != chambers.end(); kChamber ++ ) {
         if( kChamber->detector() != MuonSubdetId::CSC ) continue;
         for( std::vector<reco::MuonSegmentMatch>::const_iterator kSegment = kChamber->segmentMatches.begin();
              kSegment != kChamber->segmentMatches.end(); kSegment++ ) {
           edm::Ref<CSCSegmentCollection> cscSegRef = kSegment->cscSegmentRef;
           CSCDetId kCscDetID = cscSegRef->cscDetId();
           
           if( kCscDetID == jCscDetID ) {
             Segment2IsGood = false;
             if(!lowpttrackmu) Segment2IsGood_alt=false;
           }
         }
           }
         }
       }   
       if(Segment1IsGood && Segment2IsGood) {
         nSegs++;
         minus_endcap = iGlobalPosition.z() < 0 || jGlobalPosition.z() < 0;
         plus_endcap = iGlobalPosition.z() > 0 || jGlobalPosition.z() > 0;
         //      if( abs(jT-iT)/sqrt( (jR-iR)*(jR-iR)+(jZ-iZ)*(jZ-iZ) )<0.05 && abs(jT-iT)/sqrt( (jR-iR)*(jR-iR)+(jZ-iZ)*(jZ-iZ) )>0.02 && minus_endcap&&plus_endcap ) both_endcaps_dtcut =true;
       }
       if(Segment1IsGood_alt && Segment2IsGood_alt) {
             nSegs_alt++;
             minus_endcap = iGlobalPosition.z() < 0 || jGlobalPosition.z() < 0;
             plus_endcap = iGlobalPosition.z() > 0 || jGlobalPosition.z() > 0;
         double iTBX = iT+sqrt(iGlobalPosition.mag2())/c_cm_per_ns;
         double jTBX = jT+sqrt(jGlobalPosition.mag2())/c_cm_per_ns;
         double truedt = (iTBX>jTBX)? iTBX-jTBX-std::abs(iZ-jZ)/c_cm_per_ns :  jTBX-iTBX-std::abs(iZ-jZ)/c_cm_per_ns;
             if( 
        std::abs(truedt)<15 &&
        (iT>-15 || jT>-15)&&
        minus_endcap&&plus_endcap ) both_endcaps_loose_dtcut_alt =true;
           }
       
     }
       }
       // Correct the fact that the way nSegs counts will always be short by 1
       if (nSegs > 0) nSegs++;
       
       // The opposite endcaps segments do not need to belong to the longest chain. 
       if (nSegs > 0) both_endcaps_loose =  both_endcaps_loose ? both_endcaps_loose : minus_endcap && plus_endcap;
       if (nSegs_alt > 0) nSegs_alt++;
       if (nSegs_alt > 0) both_endcaps_loose_alt =  both_endcaps_loose_alt ? both_endcaps_loose_alt : minus_endcap && plus_endcap;

       //       if (nSegs > 0) both_endcaps_dt20ns = both_endcaps_dt20ns ? both_endcaps_dt20ns : minus_endcap && plus_endcap &&dt20ns;
       if (nSegs > maxNSegments) {
     // Use value of r, phi to collect halo CSCSegments for examining timing (not coded yet...)
     //r = iR;
     //phi = iPhi;
     maxNSegments = nSegs;
     both_endcaps = both_endcaps ? both_endcaps : minus_endcap && plus_endcap;
       }
      
       if (nSegs_alt > maxNSegments_alt) {
         maxNSegments_alt = nSegs_alt;
         both_endcaps_alt = both_endcaps_alt ? both_endcaps_alt : minus_endcap && plus_endcap;
       }
 
     }
   }

   //Deprecated methods, kept for backward compatibility                                                                                                                                                     
   TheCSCHaloData.SetHLTBit(false);
   TheCSCHaloData.SetNumberOfHaloTriggers(0,0);
   TheCSCHaloData.SetNumberOfHaloTriggers_TrkMuUnVeto(0,0);
   TheCSCHaloData.SetNOutOfTimeTriggers(0,0);

   //Current methods used
   TheCSCHaloData.SetNFlatHaloSegments(maxNSegments);
   TheCSCHaloData.SetSegmentsBothEndcaps(both_endcaps);
   TheCSCHaloData.SetNFlatHaloSegments_TrkMuUnVeto(maxNSegments_alt);
   TheCSCHaloData.SetSegmentsBothEndcaps_Loose_TrkMuUnVeto(both_endcaps_loose_alt);
   TheCSCHaloData.SetSegmentsBothEndcaps_Loose_dTcut_TrkMuUnVeto(both_endcaps_loose_dtcut_alt);
   TheCSCHaloData.SetSegmentIsCaloMatched(calomatched);
   TheCSCHaloData.SetSegmentIsHCaloMatched(HCALmatched);
   TheCSCHaloData.SetSegmentIsEBCaloMatched(ECALBmatched);
   TheCSCHaloData.SetSegmentIsEECaloMatched(ECALEmatched);
   
   return TheCSCHaloData;
}

math::XYZPoint CSCHaloAlgo::getPosition(const DetId &id, reco::Vertex::Point vtx){

  const GlobalPoint pos = ((id.det() == DetId::Hcal) ? hgeo_->getPosition(id) : GlobalPoint(geo_->getPosition(id)));
  math::XYZPoint posV(pos.x() - vtx.x(),pos.y() - vtx.y(),pos.z() - vtx.z());
  return posV;
}


bool CSCHaloAlgo::HCALSegmentMatching(edm::Handle<HBHERecHitCollection>& rechitcoll, float et_thresh_rh, float dphi_thresh_segvsrh, float dr_lowthresh_segvsrh, float dr_highthresh_segvsrh, float dt_lowthresh_segvsrh, float dt_highthresh_segvsrh, float iZ, float iR, float iT, float iPhi){
  reco::Vertex::Point vtx(0,0,0);
  for(size_t ihit = 0; ihit< rechitcoll->size(); ++ ihit){
    const HBHERecHit & rechit = (*rechitcoll)[ ihit ];
    math::XYZPoint rhpos = getPosition(rechit.id(),vtx);
    double rhet = rechit.energy()/cosh(rhpos.eta());
    double dphi_rhseg = abs(deltaPhi(rhpos.phi(),iPhi));
    double dr_rhseg = sqrt(rhpos.x()*rhpos.x()+rhpos.y()*rhpos.y()) - iR;
    double dtcorr_rhseg = rechit.time()- abs(rhpos.z()-iZ)/30- iT; 
    if(
       (rechit.time()<-3)&&
       (rhpos.z()*iZ<0|| abs(rhpos.z())<200)&&
       rhet> et_thresh_rh&&
       dphi_rhseg < dphi_thresh_segvsrh &&
       dr_rhseg < dr_highthresh_segvsrh && dr_rhseg> dr_lowthresh_segvsrh && //careful: asymmetric cut might not be the most appropriate thing 
       dtcorr_rhseg> dt_lowthresh_segvsrh && dtcorr_rhseg< dt_highthresh_segvsrh
      ) return true; 
  }
  return false;
}

bool CSCHaloAlgo::ECALSegmentMatching(edm::Handle<EcalRecHitCollection>& rechitcoll,  float et_thresh_rh, float dphi_thresh_segvsrh, float dr_lowthresh_segvsrh, float dr_highthresh_segvsrh, float dt_lowthresh_segvsrh,float dt_highthresh_segvsrh, float iZ, float iR, float iT, float iPhi ){
  reco::Vertex::Point vtx(0,0,0);
  for(size_t ihit = 0; ihit<rechitcoll->size(); ++ ihit){
    const EcalRecHit & rechit = (*rechitcoll)[ ihit ];
    math::XYZPoint rhpos = getPosition(rechit.id(),vtx);
    double rhet = rechit.energy()/cosh(rhpos.eta());
    double dphi_rhseg = abs(deltaPhi(rhpos.phi(),iPhi));
    double dr_rhseg = sqrt(rhpos.x()*rhpos.x()+rhpos.y()*rhpos.y()) - iR;
    double dtcorr_rhseg = rechit.time()- abs(rhpos.z()-iZ)/30- iT; 
    if( 
       ( rechit.time()<-1)&&
       (rhpos.z()*iZ<0|| abs(rhpos.z())<200)&&
       rhet> et_thresh_rh&&
       dphi_rhseg < dphi_thresh_segvsrh &&
       dr_rhseg < dr_highthresh_segvsrh && dr_rhseg> dr_lowthresh_segvsrh && //careful: asymmetric cut might not be the most appropriate thing 
       dtcorr_rhseg> dt_lowthresh_segvsrh && dtcorr_rhseg< dr_highthresh_segvsrh
       ) return true; 
  }
  return false;
}