GhostTrackVertexFinder.cc File Reference

#include <algorithm>
#include <iterator>
#include <vector>
#include <map>
#include <set>
#include <Math/SVector.h>
#include <Math/SMatrix.h>
#include <Math/MatrixFunctions.h>
#include "DataFormats/GeometryVector/interface/GlobalPoint.h"
#include "DataFormats/GeometryVector/interface/GlobalVector.h"
#include "DataFormats/GeometryCommonDetAlgo/interface/GlobalError.h"
#include "DataFormats/BeamSpot/interface/BeamSpot.h"
#include "TrackingTools/TrajectoryParametrization/interface/GlobalTrajectoryParameters.h"
#include "TrackingTools/TrajectoryState/interface/TrajectoryStateOnSurface.h"
#include "TrackingTools/TrajectoryState/interface/FreeTrajectoryState.h"
#include "TrackingTools/GeomPropagators/interface/AnalyticalImpactPointExtrapolator.h"
#include "TrackingTools/TransientTrack/interface/TransientTrack.h"
#include "TrackingTools/TransientTrack/interface/TransientTrackFromFTSFactory.h"
#include "RecoVertex/VertexPrimitives/interface/TransientVertex.h"
#include "RecoVertex/VertexPrimitives/interface/VertexFitter.h"
#include "RecoVertex/VertexPrimitives/interface/VertexState.h"
#include "RecoVertex/VertexPrimitives/interface/CachingVertex.h"
#include "RecoVertex/VertexPrimitives/interface/LinearizedTrackState.h"
#include "RecoVertex/VertexPrimitives/interface/ConvertError.h"
#include "RecoVertex/VertexPrimitives/interface/ConvertToFromReco.h"
#include "RecoVertex/VertexTools/interface/LinearizedTrackStateFactory.h"
#include "RecoVertex/VertexTools/interface/VertexTrackFactory.h"
#include "RecoVertex/VertexTools/interface/VertexDistance3D.h"
#include "RecoVertex/VertexTools/interface/GeometricAnnealing.h"
#include "RecoVertex/KalmanVertexFit/interface/KalmanVertexFitter.h"
#include "RecoVertex/AdaptiveVertexFit/interface/AdaptiveVertexFitter.h"
#include "RecoVertex/GhostTrackFitter/interface/GhostTrack.h"
#include "RecoVertex/GhostTrackFitter/interface/GhostTrackState.h"
#include "RecoVertex/GhostTrackFitter/interface/GhostTrackFitter.h"
#include "RecoVertex/GhostTrackFitter/interface/GhostTrackPrediction.h"
#include "RecoVertex/GhostTrackFitter/interface/SequentialGhostTrackFitter.h"
#include "RecoVertex/GhostTrackFitter/interface/KalmanGhostTrackUpdater.h"
#include "RecoVertex/GhostTrackFitter/interface/GhostTrackVertexFinder.h"

Go to the source code of this file.

Classes
struct	reco::GhostTrackVertexFinder::FinderInfo

Functions
static bool	covarianceUpdate (Matrix3S &cov, const Vector3 &residual, const Matrix3S &error, double &chi2, double theta, double phi)
static GhostTrackPrediction	dummyPrediction (const Vertex &primaryVertex, const Track &ghostTrack)
static double	fitChi2 (const CachingVertex< 5 > &vtx)
static void	mergeTrackHelper (const std::vector< RefCountedVertexTrack > &tracks, std::vector< RefCountedVertexTrack > &newTracks, const VertexState &state, const VtxTrackIs &ghostTrackFinder, RefCountedVertexTrack &ghostTrack, const VertexTrackFactory< 5 > &factory)
static RefCountedVertexTrack	relinearizeTrack (const RefCountedVertexTrack &track, const VertexState &state, const VertexTrackFactory< 5 > factory)
static std::vector < RefCountedVertexTrack >	relinearizeTracks (const std::vector< RefCountedVertexTrack > &tracks, const VertexState &state)
static VertexState	stateMean (const VertexState &v1, const VertexState &v2)
static double	trackVertexCompat (const CachingVertex< 5 > &vtx, const RefCountedVertexTrack &vertexTrack)
static TransientTrack	transientGhostTrack (const GhostTrackPrediction &pred, const MagneticField *field)
static CachingVertex< 5 >	vertexAtState (const TransientTrack &ghostTrack, const GhostTrackPrediction &pred, const GhostTrackState &state)
static double	vtxErrorLong (const GlobalError &error, const GlobalVector &dir)
static GlobalPoint	vtxMean (const GlobalPoint &p1, const GlobalError &e1, const GlobalPoint &p2, const GlobalError &e2)

Function Documentation

static bool covarianceUpdate ( Matrix3S &  cov, const Vector3 &  residual, const Matrix3S &  error, double &  chi2, double  theta, double  phi  )

static

Definition at line 139 of file GhostTrackVertexFinder.cc.

References funct::cos(), and funct::sin().

Referenced by vertexAtState().

{
    using namespace ROOT::Math;

    Matrix23 jacobian;
    jacobian(0, 0) = std::cos(phi) * std::cos(theta);
    jacobian(0, 1) = std::sin(phi) * std::cos(theta);
    jacobian(0, 2) = -std::sin(theta);
    jacobian(1, 0) = -std::sin(phi);
    jacobian(1, 1) = std::cos(phi);

    Matrix2S measErr = Similarity(jacobian, error);
    Matrix2S combErr = Similarity(jacobian, cov) + measErr;
    if (!measErr.Invert() || !combErr.Invert())
        return false;

    cov -= SimilarityT(jacobian * cov, combErr);
    chi2 += Similarity(jacobian * residual, measErr);

    return true;
}

static GhostTrackPrediction dummyPrediction ( const Vertex &  primaryVertex, const Track &  ghostTrack  )

static

Definition at line 627 of file GhostTrackVertexFinder.cc.

References RecoVertex::convertError(), RecoVertex::convertPos(), reco::Vertex::error(), reco::Vertex::position(), reco::TrackBase::px(), reco::TrackBase::py(), and reco::TrackBase::pz().

Referenced by reco::GhostTrackVertexFinder::vertices().

{
    return GhostTrackPrediction(
            RecoVertex::convertPos(primaryVertex.position()),
            RecoVertex::convertError(primaryVertex.error()),
            GlobalVector(ghostTrack.px(), ghostTrack.py(),
                         ghostTrack.pz()), 0.05);
}

static double fitChi2 ( const CachingVertex< 5 > &  vtx )

static

Definition at line 746 of file GhostTrackVertexFinder.cc.

References CachingVertex< N >::degreesOfFreedom(), and CachingVertex< N >::totalChiSquared().

Referenced by PFGsfHelper::PFGsfHelper(), TtEvtBuilder< C >::produce(), and reco::GhostTrackVertexFinder::recursiveMerge().

{
    return vtx.totalChiSquared() / vtx.degreesOfFreedom();
}

static void mergeTrackHelper ( const std::vector< RefCountedVertexTrack > &  tracks, std::vector< RefCountedVertexTrack > &  newTracks, const VertexState &  state, const VtxTrackIs &  ghostTrackFinder, RefCountedVertexTrack &  ghostTrack, const VertexTrackFactory< 5 > &  factory  )

static

Definition at line 777 of file GhostTrackVertexFinder.cc.

References relval_steps::gt, and relinearizeTrack().

Referenced by reco::GhostTrackVertexFinder::mergeVertices().

{
    for(std::vector<RefCountedVertexTrack>::const_iterator iter =
            tracks.begin(); iter != tracks.end(); ++iter) {
        bool gt = ghostTrackFinder(*iter);
        if (gt && ghostTrack)
            continue;

        RefCountedVertexTrack track =
                relinearizeTrack(*iter, state, factory);

        if (gt)
            ghostTrack = *iter;
        else
            newTracks.push_back(*iter);
    }
}

static RefCountedVertexTrack relinearizeTrack ( const RefCountedVertexTrack &  track, const VertexState &  state, const VertexTrackFactory< 5 >  factory  )

static

Definition at line 211 of file GhostTrackVertexFinder.cc.

References VertexState::position(), and VertexTrackFactory< N >::vertexTrack().

Referenced by mergeTrackHelper(), reco::GhostTrackVertexFinder::reassignTracks(), and relinearizeTracks().

{
    RefCountedLinearizedTrackState linTrack = track->linearizedTrack();
    linTrack = linTrack->stateWithNewLinearizationPoint(state.position());
    return factory.vertexTrack(linTrack, state);
}

static std::vector<RefCountedVertexTrack> relinearizeTracks ( const std::vector< RefCountedVertexTrack > &  tracks, const VertexState &  state  )

static

Definition at line 221 of file GhostTrackVertexFinder.cc.

References relinearizeTrack().

Referenced by reco::GhostTrackVertexFinder::reassignTracks().

{
    VertexTrackFactory<5> vertexTrackFactory;

    std::vector<RefCountedVertexTrack> finalTracks;
    finalTracks.reserve(tracks.size());

    for(std::vector<RefCountedVertexTrack>::const_iterator iter =
                tracks.begin(); iter != tracks.end(); ++iter)
        finalTracks.push_back(
            relinearizeTrack(*iter, state, vertexTrackFactory));

    return finalTracks;
}

static VertexState stateMean ( const VertexState &  v1, const VertexState &  v2  )

static

Definition at line 132 of file GhostTrackVertexFinder.cc.

References VertexState::error(), VertexState::position(), and vtxMean().

Referenced by reco::GhostTrackVertexFinder::mergeVertices().

{
    return VertexState(vtxMean(v1.position(), v1.error(),
                               v2.position(), v2.error()),
                       v1.error() + v2.error());
}

static double trackVertexCompat ( const CachingVertex< 5 > &  vtx, const RefCountedVertexTrack &  vertexTrack  )

static

Definition at line 250 of file GhostTrackVertexFinder.cc.

References conv, dir, relativeConstraints::error, CachingVertex< N >::error(), GlobalErrorBase< T, ErrorWeightType >::matrix_new(), point, CachingVertex< N >::position(), and reco::TransientTrack::track().

Referenced by reco::GhostTrackVertexFinder::reassignTracks().

{
    using namespace ROOT::Math;

    TransientTrack track = vertexTrack->linearizedTrack()->track();
    GlobalPoint point = vtx.position();
    AnalyticalImpactPointExtrapolator extrap(track.field());
    TrajectoryStateOnSurface tsos =
            extrap.extrapolate(track.impactPointState(), point);

    if (!tsos.isValid())
        return 1.0e6;

    GlobalPoint point1 = vtx.position();
    GlobalPoint point2 = tsos.globalPosition();
    Vector3 dir = conv(point2 - point1);
    Matrix3S error = vtx.error().matrix_new() +
                     tsos.cartesianError().matrix().Sub<Matrix3S>(0, 0);
    if (!error.Invert())
        return 1.0e6;

    return ROOT::Math::Similarity(error, dir);
}

static TransientTrack transientGhostTrack ( const GhostTrackPrediction &  pred, const MagneticField *  field  )

static

Definition at line 110 of file GhostTrackVertexFinder.cc.

References TransientTrackFromFTSFactory::build(), and reco::GhostTrackPrediction::fts().

Referenced by reco::GhostTrackVertexFinder::refitGhostTrack(), and reco::GhostTrackVertexFinder::vertices().

{ return TransientTrackFromFTSFactory().build(pred.fts(field)); }

static CachingVertex<5> vertexAtState ( const TransientTrack &  ghostTrack, const GhostTrackPrediction &  pred, const GhostTrackState &  state  )

static

Definition at line 163 of file GhostTrackVertexFinder.cc.

References reco::GhostTrackState::cartesianError(), conv, covarianceUpdate(), relativeConstraints::error, reco::GhostTrackState::globalPosition(), reco::GhostTrackState::isValid(), reco::GhostTrackState::lambda(), LinearizedTrackStateFactory::linearizedTrackState(), GlobalErrorBase< T, ErrorWeightType >::matrix_new(), point, reco::GhostTrackPrediction::position(), reco::GhostTrackPrediction::positionError(), reco::GhostTrackState::track(), VertexTrackFactory< N >::vertexTrack(), and vtxMean().

Referenced by reco::GhostTrackVertexFinder::initialVertices(), reco::GhostTrackVertexFinder::reassignTracks(), and reco::GhostTrackVertexFinder::refitGhostTrack().

{
    LinearizedTrackStateFactory linTrackFactory;
    VertexTrackFactory<5> vertexTrackFactory;

    if (!state.isValid())
        return CachingVertex<5>();

    GlobalPoint pca1 = pred.position(state.lambda());
    GlobalError err1 = pred.positionError(state.lambda());

    GlobalPoint pca2 = state.globalPosition();
    GlobalError err2 = state.cartesianError();

    GlobalPoint point = vtxMean(pca1, err1, pca2, err2);

    TransientTrack recTrack = state.track();

    RefCountedLinearizedTrackState linState[2] = {
        linTrackFactory.linearizedTrackState(point, ghostTrack),
        linTrackFactory.linearizedTrackState(point, recTrack)
    };
    if ( !linState[0]->isValid() || !linState[1]->isValid() )
      return CachingVertex<5>();

    Matrix3S cov = SMatrixIdentity();
    cov *= 10000;
    double chi2 = 0.;
    if (!covarianceUpdate(cov, conv(pca1 - point), err1.matrix_new(), chi2,
                           linState[0]->predictedStateParameters()[1],
                           linState[0]->predictedStateParameters()[2]) ||
        !covarianceUpdate(cov, conv(pca2 - point), err2.matrix_new(), chi2,
                           linState[1]->predictedStateParameters()[1],
                           linState[1]->predictedStateParameters()[2]))
        return CachingVertex<5>();

    GlobalError error(cov);
    VertexState vtxState(point, error);

    std::vector<RefCountedVertexTrack> linTracks(2);
    linTracks[0] = vertexTrackFactory.vertexTrack(linState[0], vtxState);
    linTracks[1] = vertexTrackFactory.vertexTrack(linState[1], vtxState);

    return CachingVertex<5>(point, error, linTracks, chi2);
}

static double vtxErrorLong ( const GlobalError &  error, const GlobalVector &  dir  )

static

Definition at line 114 of file GhostTrackVertexFinder.cc.

References conv, and GlobalErrorBase< T, ErrorWeightType >::matrix_new().

Referenced by vtxMean().

{
    return ROOT::Math::Similarity(conv(dir), error.matrix_new());
}

static GlobalPoint vtxMean ( const GlobalPoint &  p1, const GlobalError &  e1, const GlobalPoint &  p2, const GlobalError &  e2  )

static

Definition at line 119 of file GhostTrackVertexFinder.cc.

References diffTreeTool::diff, p1, vtxErrorLong(), and histoStyle::weight.

Referenced by GlobalTrackingRegion::checkRZ(), RectangularEtaPhiTrackingRegion::checkRZOld(), stateMean(), and vertexAtState().

{
    GlobalVector diff = p2 - p1;

    double err1 = vtxErrorLong(e1, diff);
    double err2 = vtxErrorLong(e2, diff);

    double weight = err1 / (err1 + err2);

    return p1 + weight * diff;
}