SeedGeneratorForCRack.cc

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#include "RecoTracker/SpecialSeedGenerators/interface/SeedGeneratorForCRack.h"
#include "RecoTracker/TkHitPairs/interface/CosmicLayerPairs.h"
#include "FWCore/MessageLogger/interface/MessageLogger.h"
#include "TrackingTools/Records/interface/TransientRecHitRecord.h" 
void 
SeedGeneratorForCRack::init(const SiStripRecHit2DCollection &collstereo,
                  const SiStripRecHit2DCollection &collrphi ,
                  const SiStripMatchedRecHit2DCollection &collmatched,
                  const edm::EventSetup& iSetup)
{
  iSetup.get<IdealMagneticFieldRecord>().get(magfield);
  iSetup.get<TrackerDigiGeometryRecord>().get(tracker);
  thePropagatorAl=    new PropagatorWithMaterial(alongMomentum,0.1057,&(*magfield) );
  thePropagatorOp=    new PropagatorWithMaterial(oppositeToMomentum,0.1057,&(*magfield) );
  theUpdator=         new KFUpdator();
  
  // get the transient builder

  edm::ESHandle<TransientTrackingRecHitBuilder> theBuilder;

  iSetup.get<TransientRecHitRecord>().get(builderName,theBuilder);
  TTTRHBuilder = theBuilder.product();
  CosmicLayerPairs cosmiclayers(geometry);
  cosmiclayers.init(collstereo,collrphi,collmatched,iSetup);
  thePairGenerator=new CosmicHitPairGenerator(cosmiclayers,iSetup);
  HitPairs.clear();
  thePairGenerator->hitPairs(region,HitPairs,iSetup);
  LogDebug("CosmicSeedFinder") <<"Initialized with " << HitPairs.size() << " hit pairs" << std::endl;
}

SeedGeneratorForCRack::SeedGeneratorForCRack(edm::ParameterSet const& conf):
  conf_(conf), region(conf.getParameter<double>("ptMin")
                      ,conf.getParameter<double>("originRadius")
                      ,conf.getParameter<double>("originHalfLength")
                      ,conf.getParameter<double>("originZPosition")
                      )
{  
  seedpt = conf_.getParameter<double>("SeedPt");
  builderName = conf_.getParameter<std::string>("TTRHBuilder");   
  geometry=conf_.getUntrackedParameter<std::string>("GeometricStructure","STANDARD");
  multipleScatteringFactor=conf_.getUntrackedParameter<double>("multipleScatteringFactor", 1.0);
  seedMomentum =conf_.getUntrackedParameter<double>("SeedMomentum",1);
}

void SeedGeneratorForCRack::run(TrajectorySeedCollection &output,const edm::EventSetup& iSetup){
  seeds(output,iSetup,region);
  delete thePairGenerator;
  delete thePropagatorAl;
  delete thePropagatorOp;
  delete theUpdator; 
}

void SeedGeneratorForCRack::seeds(TrajectorySeedCollection &output,
                    const edm::EventSetup& iSetup,
                    const TrackingRegion& region){
  for(unsigned int is=0;is<HitPairs.size();is++){

    GlobalPoint inner = tracker->idToDet((*(HitPairs[is].inner())).geographicalId())->surface().toGlobal((*(HitPairs[is].inner())).localPosition());
    GlobalPoint outer = tracker->idToDet((*(HitPairs[is].outer())).geographicalId())->surface().toGlobal((*(HitPairs[is].outer())).localPosition());
    
    LogDebug("CosmicSeedFinder") <<"inner point of the seed "<<inner <<" outer point of the seed "<<outer; 
    TransientTrackingRecHit::ConstRecHitPointer inrhit=TTTRHBuilder->build(HitPairs[is].inner()->hit());
    TransientTrackingRecHit::ConstRecHitPointer outrhit = TTTRHBuilder->build(HitPairs[is].outer()->hit());

    edm::OwnVector<TrackingRecHit> hits;
    hits.push_back(HitPairs[is].outer()->hit()->clone());

    for (int i=0;i<2;i++){
      //FIRST STATE IS CALCULATED CONSIDERING THAT THE CHARGE CAN BE POSITIVE OR NEGATIVE
      int predsign=(2*i)-1;
      if((outer.y()-inner.y())>0){
    GlobalVector momentum = GlobalVector(inner-outer);
    momentum = momentum.unit()*seedMomentum;
    GlobalTrajectoryParameters Gtp(inner,
                       momentum,
                       predsign, 
                       &(*magfield));
    AlgebraicSymMatrix55 errMatrix = ROOT::Math::SMatrixIdentity();
    TSOS innerState = TSOS(Gtp, CurvilinearTrajectoryError(errMatrix), tracker->idToDet((HitPairs[is].inner()->hit())->geographicalId())->surface());
    const TSOS innerUpdated = theUpdator->update(innerState, *inrhit);
    //Cosmic Seed update inner...
    LogDebug("CosmicSeedFinder") << " FirstTSOS " << innerUpdated;
    
    //First propagation
    const TSOS outerState =
      thePropagatorOp->propagate(innerUpdated,
                     tracker->idToDet((*(HitPairs[is].outer())).geographicalId())->surface());
    if ( outerState.isValid()) {
      LogDebug("CosmicSeedFinder") <<"outerState "<<outerState;
      TSOS outerUpdated= theUpdator->update( outerState,*outrhit);
      //fudge factor for multiple scattering
      outerUpdated.rescaleError( multipleScatteringFactor);
      if ( outerUpdated.isValid()) {
        LogDebug("CosmicSeedFinder") <<"outerUpdated "<<outerUpdated;
        
        PTrajectoryStateOnDet PTraj=  
          trajectoryStateTransform::persistentState(outerUpdated, (*(HitPairs[is].outer())).geographicalId().rawId());
        output.push_back(TrajectorySeed(PTraj,hits,alongMomentum));
        
      }else      edm::LogWarning("CosmicSeedFinder") << " SeedForCosmics first update failed ";
    }else      edm::LogWarning("CosmicSeedFinder") << " SeedForCosmics first propagation failed ";
      
      
      }
      else{
        GlobalVector momentum= GlobalVector(outer-inner);
    momentum=momentum.unit()*seedMomentum;
    GlobalTrajectoryParameters Gtp(inner,
                       momentum,
                       predsign, 
                       &(*magfield));
    AlgebraicSymMatrix55 errMatrix = ROOT::Math::SMatrixIdentity();
    TSOS innerState = TSOS(Gtp, CurvilinearTrajectoryError(errMatrix), tracker->idToDet((HitPairs[is].inner()->hit())->geographicalId())->surface());
    const TSOS innerUpdated = theUpdator->update(innerState, *inrhit);
    LogDebug("CosmicSeedFinder") << " FirstTSOS "<< innerState;
    
    //First propagation
    const TSOS outerState =
      thePropagatorOp->propagate(innerUpdated,
                     tracker->idToDet((*(HitPairs[is].outer())).geographicalId())->surface());
    if ( outerState.isValid()) {
      
      LogDebug("CosmicSeedFinder") <<"outerState "<<outerState;
      TSOS outerUpdated = theUpdator->update( outerState,*outrhit);
      //fudge factor for multiple scattering
      outerUpdated.rescaleError( multipleScatteringFactor);
      if ( outerUpdated.isValid()) {
      LogDebug("CosmicSeedFinder") <<"outerUpdated "<<outerUpdated;
      PTrajectoryStateOnDet PTraj=  
        trajectoryStateTransform::persistentState(outerUpdated,(*(HitPairs[is].outer())).geographicalId().rawId());
          output.push_back(TrajectorySeed(PTraj,hits,oppositeToMomentum));
    
      }else      edm::LogWarning("CosmicSeedFinder") << " SeedForCosmics first update failed ";
    }else      edm::LogWarning("CosmicSeedFinder") << " SeedForCosmics first propagation failed ";
      }
    }
  }
}