SeedFromNuclearInteraction Class Reference

#include <SeedFromNuclearInteraction.h>

Public Member Functions
PropagationDirection	direction () const
recHitContainer	hits () const
const TSOS &	initialTSOS () const
bool	isValid () const
ConstRecHitPointer	outerHit () const
DetId	outerHitDetId () const
GlobalPoint	outerHitPosition () const
AlgebraicMatrix33	rotationMatrix (const GlobalVector &perp) const
	SeedFromNuclearInteraction (const Propagator *prop, const TrackerGeometry *geom, const edm::ParameterSet &iConfig)
void	setMeasurements (const TSOS &tsosAtInteractionPoint, ConstRecHitPointer ihit, ConstRecHitPointer ohit)
	Fill all data members from 2 TM's where the first one is supposed to be at the interaction point. More...
void	setMeasurements (TangentHelix &primHelix, const TSOS &inner_TSOS, ConstRecHitPointer ihit, ConstRecHitPointer ohit)
	Fill all data members from 1 TSOS and 2 rec Hits and using the circle associated to the primary track as constraint. More...
FreeTrajectoryState *	stateWithError () const
FreeTrajectoryState *	stateWithError (TangentHelix &helix) const
PTrajectoryStateOnDet	trajectoryState () const
TrajectorySeed	TrajSeed () const
const TSOS &	updatedTSOS () const
virtual	~SeedFromNuclearInteraction ()

Private Types
typedef std::vector < ConstRecHitPointer >	ConstRecHitContainer
typedef TransientTrackingRecHit::ConstRecHitPointer	ConstRecHitPointer
typedef edm::OwnVector < TrackingRecHit >	recHitContainer
typedef TrajectoryMeasurement	TM
typedef TrajectoryStateOnSurface	TSOS

Private Member Functions
bool	construct ()

Private Attributes
boost::shared_ptr < FreeTrajectoryState >	freeTS_
boost::shared_ptr< TSOS >	initialTSOS_
ConstRecHitPointer	innerHit_
bool	isValid_
ConstRecHitPointer	outerHit_
double	ptMin
boost::shared_ptr < PTrajectoryStateOnDet >	pTraj
ConstRecHitContainer	theHits
const Propagator *	thePropagator
const TrackerGeometry *	theTrackerGeom
boost::shared_ptr< TSOS >	updatedTSOS_

Detailed Description

Definition at line 21 of file SeedFromNuclearInteraction.h.

Member Typedef Documentation

typedef std::vector<ConstRecHitPointer> SeedFromNuclearInteraction::ConstRecHitContainer

private

Definition at line 27 of file SeedFromNuclearInteraction.h.

typedef TransientTrackingRecHit::ConstRecHitPointer SeedFromNuclearInteraction::ConstRecHitPointer

private

Definition at line 26 of file SeedFromNuclearInteraction.h.

typedef edm::OwnVector<TrackingRecHit> SeedFromNuclearInteraction::recHitContainer

private

Definition at line 25 of file SeedFromNuclearInteraction.h.

typedef TrajectoryMeasurement SeedFromNuclearInteraction::TM

private

Definition at line 23 of file SeedFromNuclearInteraction.h.

typedef TrajectoryStateOnSurface SeedFromNuclearInteraction::TSOS

private

Definition at line 24 of file SeedFromNuclearInteraction.h.

Constructor & Destructor Documentation

SeedFromNuclearInteraction::SeedFromNuclearInteraction	(	const Propagator *	prop,
		const TrackerGeometry *	geom,
		const edm::ParameterSet &	iConfig
	)

Definition at line 13 of file SeedFromNuclearInteraction.cc.

References freeTS_, initialTSOS_, isValid_, pTraj, and updatedTSOS_.

                                                                                                                                         :
    ptMin(iConfig.getParameter<double>("ptMin")),
    thePropagator(prop), theTrackerGeom(geom)
    {
         isValid_=true;
         initialTSOS_ = boost::shared_ptr<TrajectoryStateOnSurface>(new TrajectoryStateOnSurface());
         updatedTSOS_ = boost::shared_ptr<TrajectoryStateOnSurface>(new TrajectoryStateOnSurface());
         freeTS_ = boost::shared_ptr<FreeTrajectoryState>(new FreeTrajectoryState());
         pTraj = boost::shared_ptr<PTrajectoryStateOnDet>(new PTrajectoryStateOnDet());
    }

virtual SeedFromNuclearInteraction::~SeedFromNuclearInteraction ( )

inlinevirtual

Definition at line 32 of file SeedFromNuclearInteraction.h.

{}

Member Function Documentation

bool SeedFromNuclearInteraction::construct ( )

private

Definition at line 125 of file SeedFromNuclearInteraction.cc.

References freeTS_, TrackingRecHit::geographicalId(), TrackerGeometry::idToDet(), TrajectoryStateOnSurface::isValid(), LogDebug, outerHitDetId(), TrajectoryStateTransform::persistentState(), Propagator::propagate(), pTraj, evf::utils::state, theHits, thePropagator, theTrackerGeom, KFUpdator::update(), and updatedTSOS_.

Referenced by setMeasurements().

                                           {

   // loop on all hits in theHits
   KFUpdator                 theUpdator;

   const TrackingRecHit* hit = 0;

   LogDebug("NuclearSeedGenerator") << "Seed ** initial state " << freeTS_->cartesianError().matrix();

   for ( unsigned int iHit = 0; iHit < theHits.size(); iHit++) {
     hit = theHits[iHit]->hit();
     TrajectoryStateOnSurface state = (iHit==0) ?
        thePropagator->propagate( *freeTS_, theTrackerGeom->idToDet(hit->geographicalId())->surface())
       : thePropagator->propagate( *updatedTSOS_, theTrackerGeom->idToDet(hit->geographicalId())->surface());

     if (!state.isValid()) return false;

     const TransientTrackingRecHit::ConstRecHitPointer& tth = theHits[iHit];
     updatedTSOS_.reset( new TrajectoryStateOnSurface(theUpdator.update(state, *tth)) );

   }

   TrajectoryStateTransform transformer;

   LogDebug("NuclearSeedGenerator") << "Seed ** updated state " << updatedTSOS_->cartesianError().matrix();

   pTraj = boost::shared_ptr<PTrajectoryStateOnDet>( transformer.persistentState(*updatedTSOS_, outerHitDetId().rawId()) );
   return true;
}

PropagationDirection SeedFromNuclearInteraction::direction ( ) const

inline

Definition at line 46 of file SeedFromNuclearInteraction.h.

References alongMomentum.

Referenced by stateWithError(), and TrajSeed().

{ return alongMomentum; }

edm::OwnVector< TrackingRecHit > SeedFromNuclearInteraction::hits

(

)

const

Definition at line 156 of file SeedFromNuclearInteraction.cc.

References edm::OwnVector< T, P >::push_back(), and theHits.

Referenced by TrajSeed().

                                                                     {
    recHitContainer      _hits;
    for( ConstRecHitContainer::const_iterator it = theHits.begin(); it!=theHits.end(); it++ ){
           _hits.push_back( it->get()->hit()->clone() );
    }
    return _hits;
}

const TSOS& SeedFromNuclearInteraction::initialTSOS ( ) const

inline

Definition at line 56 of file SeedFromNuclearInteraction.h.

References initialTSOS_.

{ return *initialTSOS_; }

bool SeedFromNuclearInteraction::isValid ( void  ) const

inline

Definition at line 52 of file SeedFromNuclearInteraction.h.

References isValid_.

{ return isValid_; }

ConstRecHitPointer SeedFromNuclearInteraction::outerHit ( ) const

inline

Definition at line 64 of file SeedFromNuclearInteraction.h.

References outerHit_.

{ return outerHit_; }

DetId SeedFromNuclearInteraction::outerHitDetId ( ) const

inline

Definition at line 62 of file SeedFromNuclearInteraction.h.

References outerHit_.

Referenced by construct(), and outerHitPosition().

{ return outerHit_->geographicalId(); }

GlobalPoint SeedFromNuclearInteraction::outerHitPosition ( ) const

inline

Definition at line 58 of file SeedFromNuclearInteraction.h.

References TrackerGeometry::idToDet(), outerHit_, outerHitDetId(), GeomDet::surface(), theTrackerGeom, and Surface::toGlobal().

Referenced by stateWithError().

                                       {
          return theTrackerGeom->idToDet(outerHitDetId())->surface().toGlobal(outerHit_->localPosition()); 
  }

AlgebraicMatrix33 SeedFromNuclearInteraction::rotationMatrix

(

const GlobalVector &

perp

)

const

Return the rotation matrix to be applied to get parameters in a framework where the z direction is along perp

Definition at line 164 of file SeedFromNuclearInteraction.cc.

References Vector3DBase< T, FrameTag >::cross(), query::result, csvLumiCalc::unit, Vector3DBase< T, FrameTag >::unit(), PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

Referenced by stateWithError().

                                                                                           {

   AlgebraicMatrix33 result;

   // z axis coincides with perp
   GlobalVector zAxis = perp.unit();

   // x axis has no global Z component
   GlobalVector xAxis;
   if ( zAxis.x() != 0 || zAxis.y() != 0) {
     // precision is not an issue here, just protect against divizion by zero
     xAxis = GlobalVector( -zAxis.y(), zAxis.x(), 0).unit();
   }
   else { // perp coincides with global Z
     xAxis = GlobalVector( 1, 0, 0);
   }

   // y axis obtained by cross product
   GlobalVector yAxis( zAxis.cross( xAxis));

  result(0,0) = xAxis.x();
  result(0,1) = xAxis.y();
  result(0,2) = xAxis.z();
  result(1,0) = yAxis.x();
  result(1,1) = yAxis.y();
  result(1,2) = yAxis.z();
  result(2,0) = zAxis.x();
  result(2,1) = zAxis.y();
  result(2,2) = zAxis.z();
  return result;
}

void SeedFromNuclearInteraction::setMeasurements	(	const TSOS &	tsosAtInteractionPoint,
		ConstRecHitPointer	ihit,
		ConstRecHitPointer	ohit
	)

Fill all data members from 2 TM's where the first one is supposed to be at the interaction point.

Definition at line 25 of file SeedFromNuclearInteraction.cc.

References construct(), freeTS_, initialTSOS_, innerHit_, isValid_, outerHit_, ptMin, stateWithError(), and theHits.

Referenced by NuclearInteractionFinder::fillSeeds(), and NuclearInteractionFinder::improveSeeds().

                                                                                                                         {

       // delete pointer to TrackingRecHits
       theHits.clear();

       // get the inner and outer transient TrackingRecHits
       innerHit_ = ihit;
       outerHit_ = ohit;

       //theHits.push_back(  inner_TM.recHit() ); // put temporarily - TODO: remove this line
       theHits.push_back(  outerHit_  );

       initialTSOS_.reset( new TrajectoryStateOnSurface(inner_TSOS) );

       // calculate the initial FreeTrajectoryState.
       freeTS_.reset(stateWithError());

       // check transverse momentum
       if(freeTS_->momentum().perp() < ptMin) { isValid_ = false; }
       else {
          // convert freeTS_ into a persistent TSOS on the outer surface
          isValid_ = construct(); }
}

void SeedFromNuclearInteraction::setMeasurements	(	TangentHelix &	primHelix,
		const TSOS &	inner_TSOS,
		ConstRecHitPointer	ihit,
		ConstRecHitPointer	ohit
	)

Fill all data members from 1 TSOS and 2 rec Hits and using the circle associated to the primary track as constraint.

Definition at line 49 of file SeedFromNuclearInteraction.cc.

References construct(), freeTS_, TrackerGeometry::idToDet(), initialTSOS_, innerHit_, isValid_, outerHit_, ptMin, stateWithError(), theHits, theTrackerGeom, and GeomDet::toGlobal().

                                                                                                                                                        {

       // delete pointer to TrackingRecHits
       theHits.clear();

       // get the inner and outer transient TrackingRecHits
       innerHit_ = ihit;
       outerHit_ = ohit;

       GlobalPoint innerPos = theTrackerGeom->idToDet(innerHit_->geographicalId())->surface().toGlobal(innerHit_->localPosition());
       GlobalPoint outerPos = theTrackerGeom->idToDet(outerHit_->geographicalId())->surface().toGlobal(outerHit_->localPosition());

       TangentHelix helix(thePrimaryHelix, outerPos, innerPos);

       theHits.push_back( innerHit_ );
       theHits.push_back( outerHit_ );

       initialTSOS_.reset( new TrajectoryStateOnSurface(inner_TSOS) );

       // calculate the initial FreeTrajectoryState from the inner and outer TM assuming that the helix equation is already known.
       freeTS_.reset(stateWithError(helix));

       if(freeTS_->momentum().perp() < ptMin) { isValid_ = false; }
       else {
          // convert freeTS_ into a persistent TSOS on the outer surface
          isValid_ = construct(); }
}

FreeTrajectoryState * SeedFromNuclearInteraction::stateWithError

(

)

const

Definition at line 77 of file SeedFromNuclearInteraction.cc.

References direction(), initialTSOS_, SurfaceOrientation::inner, and outerHitPosition().

Referenced by setMeasurements().

                                                                      {

   // Calculation of the helix assuming that the secondary track has the same direction
   // than the primary track and pass through the inner and outer hits.
   GlobalVector direction = initialTSOS_->globalDirection();
   GlobalPoint inner = initialTSOS_->globalPosition();
   TangentHelix helix(direction, inner, outerHitPosition());

   return stateWithError(helix);
}

FreeTrajectoryState * SeedFromNuclearInteraction::stateWithError

(

TangentHelix &

helix

)

const

Definition at line 88 of file SeedFromNuclearInteraction.cc.

References TangentHelix::charge(), TangentHelix::directionAtVertex(), initialTSOS_, MagneticField::inTesla(), mag(), TangentHelix::rho(), rotationMatrix(), TangentHelix::vertexError(), TangentHelix::vertexPoint(), and detailsBasic3DVector::z.

                                                                                         {

//   typedef TkRotation<float> Rotation;

   GlobalVector dirAtVtx = helix.directionAtVertex();
   const MagneticField& mag = initialTSOS_->globalParameters().magneticField();

   // Get the global parameters of the trajectory
   // we assume that the magnetic field at the vertex is equal to the magnetic field at the inner TM.
   GlobalTrajectoryParameters gtp(helix.vertexPoint(), dirAtVtx , helix.charge(mag.inTesla(helix.vertexPoint()).z())/helix.rho(), 0, &mag);

   // Error matrix in a frame where z is in the direction of the track at the vertex
   AlgebraicSymMatrix66 primaryError( initialTSOS_->cartesianError().matrix() );
   double p_max = initialTSOS_->globalParameters().momentum().mag();
   AlgebraicMatrix33 rot = this->rotationMatrix( dirAtVtx );

   AlgebraicMatrix66 globalRotation;
   globalRotation.Place_at(rot,0,0);
   globalRotation.Place_at(rot,3,3);
   AlgebraicSymMatrix66 primaryErrorInNewFrame = ROOT::Math::Similarity(globalRotation, primaryError);

   AlgebraicSymMatrix66 secondaryErrorInNewFrame = AlgebraicMatrixID();
   double p_perp_max = 2; // energy max of a secondary track emited perpendicularly to the 
                          // primary track is +/- 2 GeV
   secondaryErrorInNewFrame(0,0) = primaryErrorInNewFrame(0,0)+helix.vertexError()*p_perp_max/p_max;
   secondaryErrorInNewFrame(1,1) = primaryErrorInNewFrame(1,1)+helix.vertexError()*p_perp_max/p_max;
   secondaryErrorInNewFrame(2,2) = helix.vertexError() * helix.vertexError();
   secondaryErrorInNewFrame(3,3) = p_perp_max*p_perp_max;  
   secondaryErrorInNewFrame(4,4) = p_perp_max*p_perp_max; 
   secondaryErrorInNewFrame(5,5) = p_max*p_max;

   AlgebraicSymMatrix66 secondaryError = ROOT::Math::SimilarityT(globalRotation, secondaryErrorInNewFrame);

   return new FreeTrajectoryState( gtp, CartesianTrajectoryError(secondaryError) );
}

PTrajectoryStateOnDet SeedFromNuclearInteraction::trajectoryState ( ) const

inline

Definition at line 40 of file SeedFromNuclearInteraction.h.

References pTraj.

Referenced by TrajSeed().

{ return *pTraj; }

TrajectorySeed SeedFromNuclearInteraction::TrajSeed ( ) const

inline

Definition at line 50 of file SeedFromNuclearInteraction.h.

References direction(), hits(), and trajectoryState().

{ return TrajectorySeed(trajectoryState(),hits(),direction()); }

const TSOS& SeedFromNuclearInteraction::updatedTSOS ( ) const

inline

Definition at line 54 of file SeedFromNuclearInteraction.h.

References updatedTSOS_.

{ return *updatedTSOS_; }

Member Data Documentation

boost::shared_ptr<FreeTrajectoryState> SeedFromNuclearInteraction::freeTS_

private

Initial FreeTrajectoryState

Definition at line 83 of file SeedFromNuclearInteraction.h.

Referenced by construct(), SeedFromNuclearInteraction(), and setMeasurements().

boost::shared_ptr<TSOS> SeedFromNuclearInteraction::initialTSOS_

private

Initial TSOS used as input

Definition at line 81 of file SeedFromNuclearInteraction.h.

Referenced by initialTSOS(), SeedFromNuclearInteraction(), setMeasurements(), and stateWithError().

ConstRecHitPointer SeedFromNuclearInteraction::innerHit_

private

Pointer to the hit of the inner TM

Definition at line 76 of file SeedFromNuclearInteraction.h.

Referenced by setMeasurements().

bool SeedFromNuclearInteraction::isValid_

private

check if the seed is valid

Definition at line 71 of file SeedFromNuclearInteraction.h.

Referenced by isValid(), SeedFromNuclearInteraction(), and setMeasurements().

ConstRecHitPointer SeedFromNuclearInteraction::outerHit_

private

Pointer to the outer hit

Definition at line 77 of file SeedFromNuclearInteraction.h.

Referenced by outerHit(), outerHitDetId(), outerHitPosition(), and setMeasurements().

double SeedFromNuclearInteraction::ptMin

private

Minimum transverse momentum of the seed

Definition at line 90 of file SeedFromNuclearInteraction.h.

Referenced by setMeasurements().

boost::shared_ptr<PTrajectoryStateOnDet> SeedFromNuclearInteraction::pTraj

private

the final persistent TSOS

Definition at line 85 of file SeedFromNuclearInteraction.h.

Referenced by construct(), SeedFromNuclearInteraction(), and trajectoryState().

ConstRecHitContainer SeedFromNuclearInteraction::theHits

private

all the hits to be used to update the

Definition at line 73 of file SeedFromNuclearInteraction.h.

Referenced by construct(), hits(), and setMeasurements().

const Propagator* SeedFromNuclearInteraction::thePropagator

private

Definition at line 92 of file SeedFromNuclearInteraction.h.

Referenced by construct().

const TrackerGeometry* SeedFromNuclearInteraction::theTrackerGeom

private

Definition at line 93 of file SeedFromNuclearInteraction.h.

Referenced by construct(), outerHitPosition(), and setMeasurements().

boost::shared_ptr<TSOS> SeedFromNuclearInteraction::updatedTSOS_

private

Final TSOS

Definition at line 79 of file SeedFromNuclearInteraction.h.

Referenced by construct(), SeedFromNuclearInteraction(), and updatedTSOS().