#include <LinkByRecHit.h>

Public Member Functions
	LinkByRecHit ()

	~LinkByRecHit ()

Static Public Member Functions
static double	computeDist (double eta1, double phi1, double eta2, double phi2, bool etaPhi=true)
	computes a chisquare More...

static double	testECALAndPSByRecHit (const reco::PFCluster &clusterECAL, const reco::PFCluster &clusterPS, bool debug=false)

static double	testHFEMAndHFHADByRecHit (const reco::PFCluster &clusterHFEM, const reco::PFCluster &clusterHFHAD, bool debug=false)
	test association between HFEM and HFHAD, by rechit More...

static double	testTrackAndClusterByRecHit (const reco::PFRecTrack &track, const reco::PFCluster &cluster, bool isBrem=false, bool debug=false)

Detailed Description

Definition at line 9 of file LinkByRecHit.h.

Constructor & Destructor Documentation

LinkByRecHit::LinkByRecHit ( )

inline

Definition at line 11 of file LinkByRecHit.h.

11 {};

LinkByRecHit::~LinkByRecHit ( )

inline

Definition at line 12 of file LinkByRecHit.h.

12 {} ;

Member Function Documentation

double LinkByRecHit::computeDist	(	double	eta1,
		double	phi1,
		double	eta2,
		double	phi2,
		bool	etaPhi = `true`
	)

static

computes a chisquare

Definition at line 531 of file LinkByRecHit.cc.

References normalizedPhi(), and mathSSE::sqrt().

Referenced by PFBlockAlgo::link(), PFBlockAlgo::testECALAndHCAL(), testECALAndPSByRecHit(), PFBlockAlgo::testHCALAndHO(), PFBlockAlgo::testLinkBySuperCluster(), PFBlockAlgo::testSuperClusterPFCluster(), and testTrackAndClusterByRecHit().

                               {
   
   double phicor = etaPhi ? normalizedPhi(phi1 - phi2) : phi1 - phi2;
   
   // double chi2 =  
   //  (eta1 - eta2)*(eta1 - eta2) / ( reta1*reta1+ reta2*reta2 ) +
   //  phicor*phicor / ( rphi1*rphi1+ rphi2*rphi2 );
 
   double dist = std::sqrt( (eta1 - eta2)*(eta1 - eta2) 
               + phicor*phicor);
 
   return dist;
 
 }

double LinkByRecHit::testECALAndPSByRecHit	(	const reco::PFCluster &	clusterECAL,
		const reco::PFCluster &	clusterPS,
		bool	debug = `false`
	)

static

Definition at line 381 of file LinkByRecHit.cc.

References computeDist(), gather_cfg::cout, PFLayer::ECAL_ENDCAP, reco::PFRecHit::getCornersXYZ(), edm::Ref< C, T, F >::isNull(), reco::PFCluster::layer(), reco::CaloCluster::position(), reco::PFRecHit::position(), PFLayer::PS1, PFLayer::PS2, reco::PFCluster::recHitFractions(), mathSSE::sqrt(), vdt::x, and detailsBasic3DVector::y.

Referenced by PFBlockAlgo::link().

                                   {
 
 // 0.19 <-> strip_pitch
 // 6.1  <-> strip_length
   static double resPSpitch = 0.19/sqrt(12.);
   static double resPSlength = 6.1/sqrt(12.);
 
   // Check that clusterECAL is in ECAL endcap and that clusterPS is a preshower cluster
   if ( clusterECAL.layer() != PFLayer::ECAL_ENDCAP ||
        ( clusterPS.layer() != PFLayer::PS1 && 
      clusterPS.layer() != PFLayer::PS2 ) ) return -1.;
 
 #ifdef PFLOW_DEBUG
   if( debug ) 
     std::cout<<"entering test link by rechit function for ECAL and PS"<<std::endl;
 #endif
 
   //ECAL cluster position
   double zECAL  = clusterECAL.position().Z();
   double xECAL  = clusterECAL.position().X();
   double yECAL  = clusterECAL.position().Y();
 
   // PS cluster position, extrapolated to ECAL
   double zPS = clusterPS.position().Z();
   double xPS = clusterPS.position().X(); //* zECAL/zPS;
   double yPS = clusterPS.position().Y(); //* zECAL/zPS;
 // MDN jan09 : check that zEcal and zPs have the same sign
     if (zECAL*zPS <0.) return -1.;
   double deltaX = 0.;
   double deltaY = 0.;
   double sqr12 = std::sqrt(12.);
   switch (clusterPS.layer()) {
   case PFLayer::PS1:
     // vertical strips, measure x with pitch precision
     deltaX = resPSpitch * sqr12;
     deltaY = resPSlength * sqr12;
     break;
   case PFLayer::PS2:
     // horizontal strips, measure y with pitch precision
     deltaY = resPSpitch * sqr12;
     deltaX = resPSlength * sqr12;
     break;
   default:
     break;
   }
 
   // Get the rechits
   const std::vector< reco::PFRecHitFraction >&  fracs = clusterECAL.recHitFractions();
   bool linkedbyrechit = false;
   //loop rechits
   for(unsigned int rhit = 0; rhit < fracs.size(); ++rhit){
 
     const reco::PFRecHitRef& rh = fracs[rhit].recHitRef();
     double fraction = fracs[rhit].fraction();
     if(fraction < 1E-4) continue;
     if(rh.isNull()) continue;
 
     //getting rechit center position
     const reco::PFRecHit& rechit_cluster = *rh;
     
     //getting rechit corners
     const std::vector< math::XYZPoint >&  corners = rechit_cluster.getCornersXYZ();
     assert(corners.size() == 4);
     
     const math::XYZPoint& posxyz = rechit_cluster.position() * zPS/zECAL;
 #ifdef PFLOW_DEBUG
     if( debug ){
       std::cout << "Ecal rechit " << posxyz.X() << " "   << posxyz.Y() << std::endl;
       std::cout << "PS cluster  " << xPS << " " << yPS << std::endl;
     }
 #endif
     
     double x[5];
     double y[5];
     for ( unsigned jc=0; jc<4; ++jc ) {
       // corner position projected onto the preshower
       math::XYZPoint cornerpos = corners[jc] * zPS/zECAL;
       // Inflate the size by the size of the PS strips, and by 5% to include ECAL cracks.
       x[jc] = cornerpos.X() + (cornerpos.X()-posxyz.X()) * (0.05 +1.0/fabs((cornerpos.X()-posxyz.X()))*deltaX/2.);
       y[jc] = cornerpos.Y() + (cornerpos.Y()-posxyz.Y()) * (0.05 +1.0/fabs((cornerpos.Y()-posxyz.Y()))*deltaY/2.);
       
 #ifdef PFLOW_DEBUG
       if( debug ){
     std::cout<<"corners "<<jc
         << " " << cornerpos.X() << " " << x[jc] 
         << " " << cornerpos.Y() << " " << y[jc]
         << std::endl;
       }
 #endif
     }//loop corners
     
     //need to close the polygon in order to
     //use the TMath::IsInside fonction from root lib
     x[4] = x[0];
     y[4] = y[0];
     
     //Check if the extrapolation point of the track falls 
     //within the rechit boundaries
     bool isinside = TMath::IsInside(xPS,yPS,5,x,y);
       
     if( isinside ){
       linkedbyrechit = true;
       break;
     }
 
   }//loop rechits
   
   if( linkedbyrechit ) {
     if( debug ) std::cout << "Cluster PS and Cluster ECAL LINKED BY RECHIT" << std::endl;
     double dist = computeDist( xECAL/1000.,yECAL/1000.,
                    xPS/1000.  ,yPS/1000, 
                    false);    
     return dist;
   } else { 
     return -1.;
   }
 
 }

double LinkByRecHit::testHFEMAndHFHADByRecHit	(	const reco::PFCluster &	clusterHFEM,
		const reco::PFCluster &	clusterHFHAD,
		bool	debug = `false`
	)

static

test association between HFEM and HFHAD, by rechit

Definition at line 505 of file LinkByRecHit.cc.

References reco::CaloCluster::position(), and mathSSE::sqrt().

Referenced by PFBlockAlgo::link().

                                   {
   
   math::XYZPoint posxyzEM = clusterHFEM.position();
   math::XYZPoint posxyzHAD = clusterHFHAD.position();
 
   double dX = posxyzEM.X()-posxyzHAD.X();
   double dY = posxyzEM.Y()-posxyzHAD.Y();
   double sameZ = posxyzEM.Z()*posxyzHAD.Z();
 
   if(sameZ<0) return -1.;
 
   double dist2 = dX*dX + dY*dY; 
 
   if( dist2 < 0.1 ) {
     // less than one mm
     double dist = sqrt( dist2 );
     return dist;;
   }
   else 
     return -1.;
 
 }

double LinkByRecHit::testTrackAndClusterByRecHit	(	const reco::PFRecTrack &	track,
		const reco::PFCluster &	cluster,
		bool	isBrem = `false`,
		bool	debug = `false`
	)

static

Definition at line 10 of file LinkByRecHit.cc.

Referenced by PFElecTkProducer::isSharingEcalEnergyWithEgSC(), PFBlockAlgo::link(), and ConvBremPFTrackFinder::runConvBremFinder().

                                      {
   
 #ifdef PFLOW_DEBUG
   if( debug ) 
     std::cout<<"entering test link by rechit function"<<std::endl;
 #endif
   
   //cluster position
   double clustereta  = cluster.positionREP().Eta();
   double clusterphi  = cluster.positionREP().Phi();
   //double clusterX    = cluster.position().X();
   //double clusterY    = cluster.position().Y();
   double clusterZ    = cluster.position().Z();
 
   bool barrel = false;
   bool hcal = false;
   // double distance = 999999.9;
   double horesolscale=1.0;
 
   //track extrapolation
   const reco::PFTrajectoryPoint& atVertex 
     = track.extrapolatedPoint( reco::PFTrajectoryPoint::ClosestApproach );
   const reco::PFTrajectoryPoint& atECAL 
     = track.extrapolatedPoint( reco::PFTrajectoryPoint::ECALShowerMax );
 
   //track at calo's
   double tracketa = 999999.9;
   double trackphi = 999999.9;
   double track_X  = 999999.9;
   double track_Y  = 999999.9;
   double track_Z  = 999999.9;
   double dHEta = 0.;
   double dHPhi = 0.;
 
   // Quantities at vertex
   double trackPt = isBrem ? 999. : sqrt(atVertex.momentum().Vect().Perp2());
   // double trackEta = isBrem ? 999. : atVertex.momentum().Vect().Eta();
 
   switch (cluster.layer()) {
   case PFLayer::ECAL_BARREL: barrel = true;
   case PFLayer::ECAL_ENDCAP:
 #ifdef PFLOW_DEBUG
     if( debug )
       std::cout << "Fetching Ecal Resolution Maps"
        << std::endl;
 #endif
     // did not reach ecal, cannot be associated with a cluster.
     if( ! atECAL.isValid() ) return -1.;   
     
     tracketa = atECAL.positionREP().Eta();
     trackphi = atECAL.positionREP().Phi();
     track_X  = atECAL.position().X();
     track_Y  = atECAL.position().Y();
     track_Z  = atECAL.position().Z();
 
 /*    distance 
       = std::sqrt( (track_X-clusterX)*(track_X-clusterX)
           +(track_Y-clusterY)*(track_Y-clusterY)
           +(track_Z-clusterZ)*(track_Z-clusterZ)
            );
 */                     
     break;
    
   case PFLayer::HCAL_BARREL1: barrel = true; 
   case PFLayer::HCAL_ENDCAP:  
 #ifdef PFLOW_DEBUG
     if( debug )
       std::cout << "Fetching Hcal Resolution Maps"
        << std::endl;
 #endif
     if( isBrem ) {  
       return  -1.;
     } else { 
       hcal=true;
       const reco::PFTrajectoryPoint& atHCAL 
     = track.extrapolatedPoint( reco::PFTrajectoryPoint::HCALEntrance );
       const reco::PFTrajectoryPoint& atHCALExit 
     = track.extrapolatedPoint( reco::PFTrajectoryPoint::HCALExit );
       // did not reach hcal, cannot be associated with a cluster.
       if( ! atHCAL.isValid() ) return -1.;   
       
       // The link is computed between 0 and ~1 interaction length in HCAL
       dHEta = atHCALExit.positionREP().Eta()-atHCAL.positionREP().Eta();
       dHPhi = atHCALExit.positionREP().Phi()-atHCAL.positionREP().Phi(); 
       if ( dHPhi > M_PI ) dHPhi = dHPhi - 2.*M_PI;
       else if ( dHPhi < -M_PI ) dHPhi = dHPhi + 2.*M_PI; 
       tracketa = atHCAL.positionREP().Eta() + 0.1*dHEta;
       trackphi = atHCAL.positionREP().Phi() + 0.1*dHPhi;
       track_X  = atHCAL.position().X();
       track_Y  = atHCAL.position().Y();
       track_Z  = atHCAL.position().Z();
 /*      distance 
     = -std::sqrt( (track_X-clusterX)*(track_X-clusterX)
              +(track_Y-clusterY)*(track_Y-clusterY)
              +(track_Z-clusterZ)*(track_Z-clusterZ)
              );
 */                     
     }
     break;
 
   case PFLayer::HCAL_BARREL2: barrel = true; 
 #ifdef PFLOW_DEBUG
     if( debug )
      std::cout << "Fetching HO Resolution Maps"
            << std::endl;
 #endif
     if( isBrem ) {  
       return  -1.;
     } else { 
       hcal=true;
       horesolscale=1.15;
       const reco::PFTrajectoryPoint& atHO 
     = track.extrapolatedPoint( reco::PFTrajectoryPoint::HOLayer );
       // did not reach ho, cannot be associated with a cluster.
       if( ! atHO.isValid() ) return -1.;   
       
       //
       tracketa = atHO.positionREP().Eta();
       trackphi = atHO.positionREP().Phi();
       track_X  = atHO.position().X();
       track_Y  = atHO.position().Y();
       track_Z  = atHO.position().Z();
 
       // Is this check really useful ?
       if ( fabs(track_Z) > 700.25 ) return -1.;
 
 
 /*      distance 
     = std::sqrt( (track_X-clusterX)*(track_X-clusterX)
               +(track_Y-clusterY)*(track_Y-clusterY)
               +(track_Z-clusterZ)*(track_Z-clusterZ)
               );
 */
 #ifdef PFLOW_DEBUG
 /*      if( debug ) {
     std::cout <<"dist "<<distance<<" "<<cluster.energy()<<" "<<cluster.layer()<<" "
           <<track_X<<" "<<clusterX<<" "
           <<track_Y<<" "<<clusterY<<" "
           <<track_Z<<" "<<clusterZ<<std::endl;
       }
 */
 #endif
     }
     break;
 
   case PFLayer::PS1:
   case PFLayer::PS2:
     //Note Alex: Nothing implemented for the
     //PreShower (No resolution maps yet)
 #ifdef PFLOW_DEBUG
     if( debug )
       std::cout << "No link by rechit possible for pre-shower yet!"
        << std::endl;
 #endif
     return -1.;
   default:
     return -1.;
   }
 
 
   // Check that, if the cluster is in the endcap, 
   // 0) the track indeed points to the endcap at vertex (DISABLED)
   // 1) the track extrapolation is in the endcap too !
   // 2) the track is in the same end-cap !
   // PJ - 10-May-09
   if ( !barrel ) { 
     // if ( fabs(trackEta) < 1.0 ) return -1; 
     if ( !hcal && fabs(track_Z) < 300. ) return -1.;
     if ( track_Z * clusterZ < 0. ) return -1.;
   }
   // Check that, if the cluster is in the barrel, 
   // 1) the track is in the barrel too !
   if ( barrel ) {
     if ( !hcal && fabs(track_Z) > 300. ) return -1.;
   }
 
   double dist = LinkByRecHit::computeDist( clustereta, clusterphi, 
                      tracketa, trackphi);
   
 #ifdef PFLOW_DEBUG
   if(debug) std::cout<<"test link by rechit "<< dist <<" "<<std::endl;
   if(debug){
     std::cout<<" clustereta "  << clustereta 
     <<" clusterphi "  << clusterphi 
     <<" tracketa " << tracketa
     <<" trackphi " << trackphi << std::endl;
   }
 #endif
   
   //Testing if Track can be linked by rechit to a cluster.
   //A cluster can be linked to a track if the extrapolated position 
   //of the track to the ECAL ShowerMax/HCAL entrance falls within 
   //the boundaries of any cell that belongs to this cluster.
 
   const std::vector< reco::PFRecHitFraction >& 
     fracs = cluster.recHitFractions();
   
   bool linkedbyrechit = false;
   //loop rechits
   for(unsigned int rhit = 0; rhit < fracs.size(); ++rhit){
 
     const reco::PFRecHitRef& rh = fracs[rhit].recHitRef();
     double fraction = fracs[rhit].fraction();
     if(fraction < 1E-4) continue;
     if(rh.isNull()) continue;
     
     //getting rechit center position
     const reco::PFRecHit& rechit_cluster = *rh;
     const math::XYZPoint& posxyz 
       = rechit_cluster.position();
     const reco::PFRecHit::REPPoint& posrep 
       = rechit_cluster.positionREP();
     
     //getting rechit corners
     const std::vector< math::XYZPoint >& 
       cornersxyz = rechit_cluster.getCornersXYZ();
     const std::vector<reco::PFRecHit::REPPoint>& corners = 
       rechit_cluster.getCornersREP();
     assert(corners.size() == 4);
     
     if( barrel || hcal ){ // barrel case matching in eta/phi 
                           // (and HCAL endcap too!)
       
       //rechit size determination 
       // blown up by 50% (HCAL) to 100% (ECAL) to include cracks & gaps
       // also blown up to account for multiple scattering at low pt.
       double rhsizeEta 
     = fabs(corners[0].Eta() - corners[2].Eta());
       double rhsizePhi 
     = fabs(corners[0].Phi() - corners[2].Phi());
       if ( rhsizePhi > M_PI ) rhsizePhi = 2.*M_PI - rhsizePhi;
       if ( hcal ) { 
     rhsizeEta = rhsizeEta * horesolscale * (1.50 + 0.5/fracs.size()) + 0.2*fabs(dHEta);
     rhsizePhi = rhsizePhi * horesolscale * (1.50 + 0.5/fracs.size()) + 0.2*fabs(dHPhi); 
     
       } else { 
     rhsizeEta *= 2.00 + 1.0/fracs.size()/std::min(1.,trackPt/2.);
     rhsizePhi *= 2.00 + 1.0/fracs.size()/std::min(1.,trackPt/2.); 
       }
       
 #ifdef PFLOW_DEBUG
       if( debug ) {
     std::cout << rhit         << " Hcal RecHit=" 
          << posrep.Eta() << " " 
          << posrep.Phi() << " "
          << rechit_cluster.energy() 
          << std::endl; 
     for ( unsigned jc=0; jc<4; ++jc ) 
       std::cout<<"corners "<<jc<<" "<<corners[jc].Eta()
           <<" "<<corners[jc].Phi()<<std::endl;
     
     std::cout << "RecHit SizeEta=" << rhsizeEta
          << " SizePhi=" << rhsizePhi << std::endl;
       }
 #endif
       
       //distance track-rechit center
       // const math::XYZPoint& posxyz 
       // = rechit_cluster.position();
       double deta = fabs(posrep.Eta() - tracketa);
       double dphi = fabs(posrep.Phi() - trackphi);
       if ( dphi > M_PI ) dphi = 2.*M_PI - dphi;
       
 #ifdef PFLOW_DEBUG
       if( debug ){
     std::cout << "distance=" 
          << deta << " " 
          << dphi << " ";
     if(deta < (rhsizeEta/2.) && dphi < (rhsizePhi/2.))
       std::cout << " link here !" << std::endl;
     else std::cout << std::endl;
       }
 #endif
       
       if(deta < (rhsizeEta/2.) && dphi < (rhsizePhi/2.)){ 
     linkedbyrechit = true;
     break;
       }
     }
     else { //ECAL & PS endcap case, matching in X,Y
       
 #ifdef PFLOW_DEBUG
       if( debug ){
     const math::XYZPoint& posxyz 
       = rechit_cluster.position();
     
     std::cout << "RH " << posxyz.X()
          << " "   << posxyz.Y()
          << std::endl;
     
     std::cout << "TRACK " << track_X
          << " "      << track_Y
          << std::endl;
       }
 #endif
       
       double x[5];
       double y[5];
       
       for ( unsigned jc=0; jc<4; ++jc ) {
     math::XYZPoint cornerposxyz = cornersxyz[jc];
     x[jc] = cornerposxyz.X() + (cornerposxyz.X()-posxyz.X())
       * (1.00+0.50/fracs.size()/std::min(1.,trackPt/2.));
     y[jc] = cornerposxyz.Y() + (cornerposxyz.Y()-posxyz.Y())
       * (1.00+0.50/fracs.size()/std::min(1.,trackPt/2.));
     
 #ifdef PFLOW_DEBUG
     if( debug ){
       std::cout<<"corners "<<jc
           << " " << cornerposxyz.X()
           << " " << cornerposxyz.Y()
           << std::endl;
     }
 #endif
       }//loop corners
       
       //need to close the polygon in order to
       //use the TMath::IsInside fonction from root lib
       x[4] = x[0];
       y[4] = y[0];
       
       //Check if the extrapolation point of the track falls 
       //within the rechit boundaries
       bool isinside = TMath::IsInside(track_X,
                       track_Y,
                       5,x,y);
       
       if( isinside ){
     linkedbyrechit = true;
     break;
       }
     }//
     
   }//loop rechits
   
   if( linkedbyrechit ) {
 #ifdef PFLOW_DEBUG
     if( debug ) 
       std::cout << "Track and Cluster LINKED BY RECHIT" << std::endl;
 #endif
     /*    
     //if ( distance > 40. || distance < -100. ) 
     double clusterr = std::sqrt(clusterX*clusterX+clusterY*clusterY);
     double trackr = std::sqrt(track_X*track_X+track_Y*track_Y);
     if ( distance > 40. ) 
     std::cout << "Distance = " << distance 
     << ", Barrel/Hcal/Brem ? " << barrel << " " << hcal << " " << isBrem << std::endl
     << " Cluster " << clusterr << " " << clusterZ << " " << clusterphi << " " << clustereta << std::endl
     << " Track   " << trackr << " " << track_Z << " " << trackphi << " " << tracketa << std::endl;
     if ( !barrel && fabs(trackEta) < 1.0 ) { 
       double clusterr = std::sqrt(clusterX*clusterX+clusterY*clusterY);
       double trackr = std::sqrt(track_X*track_X+track_Y*track_Y);
       std::cout << "TrackEta/Pt = " << trackEta << " " << trackPt << ", distance = " << distance << std::endl 
         << ", Barrel/Hcal/Brem ? " << barrel << " " << hcal << " " << isBrem << std::endl
         << " Cluster " << clusterr << " " << clusterZ << " " << clusterphi << " " << clustereta << std::endl
         << " Track   " << trackr << " " << track_Z << " " << trackphi << " " << tracketa << " " << trackEta << " " << trackPt << std::endl;
     } 
     */
     return dist;
   } else {
     return -1.;
   }
 
 }

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