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#include <SignedImpactParameter3D.h>
Public Member Functions | |
| std::pair< bool, Measurement1D > | apply (const reco::TransientTrack &, const GlobalVector &direction, const reco::Vertex &vertex) const |
| int | id () const |
| SignedImpactParameter3D () | |
Static Public Member Functions | |
| static std::pair< double, Measurement1D > | distanceWithJetAxis (const reco::TransientTrack &transientTrack, const GlobalVector &direction, const reco::Vertex &vertex) |
Static Private Member Functions | |
| static TrajectoryStateOnSurface | closestApproachToJet (const FreeTrajectoryState &, const reco::Vertex &, const GlobalVector &, const MagneticField *) |
| static GlobalVector | distance (const TrajectoryStateOnSurface &, const reco::Vertex &, const GlobalVector &) |
Threedimensional track impact parameter signed according to the jet direction
Definition at line 13 of file SignedImpactParameter3D.h.
| SignedImpactParameter3D::SignedImpactParameter3D | ( | ) | [inline] |
Definition at line 19 of file SignedImpactParameter3D.h.
{};
| pair< bool, Measurement1D > SignedImpactParameter3D::apply | ( | const reco::TransientTrack & | transientTrack, |
| const GlobalVector & | direction, | ||
| const reco::Vertex & | vertex | ||
| ) | const |
Definition at line 17 of file SignedImpactParameter3D.cc.
References funct::A, abs, TrajectoryStateOnSurface::cartesianError(), IPTools::closestApproachToJet(), gather_cfg::cout, reco::Vertex::covariance(), funct::D, Vector3DBase< T, FrameTag >::dot(), reco::TransientTrack::field(), TrajectoryStateOnSurface::freeTrajectoryState(), TrajectoryStateOnSurface::globalMomentum(), TrajectoryStateOnSurface::globalPosition(), reco::TransientTrack::impactPointState(), TrajectoryStateOnSurface::isValid(), PV3DBase< T, PVType, FrameType >::mag(), CartesianTrajectoryError::matrix(), reco::Vertex::position(), mathSSE::sqrt(), Vector3DBase< T, FrameTag >::unit(), PV3DBase< T, PVType, FrameType >::x(), reco::Vertex::x(), PV3DBase< T, PVType, FrameType >::y(), reco::Vertex::y(), PV3DBase< T, PVType, FrameType >::z(), and reco::Vertex::z().
Referenced by ImpactParameterAlgorithm::tag().
{
double theValue=0.;
double theError=0.;
bool theIsValid=false;
TrajectoryStateOnSurface TSOS = transientTrack.impactPointState();
if ( !TSOS.isValid() ) {
cout << "====>>>> SignedImpactParameter3D::apply : TSOS not valid = " << TSOS.isValid() << endl ;
return pair<bool,Measurement1D>(theIsValid,Measurement1D(0.,0.)) ;
}
FreeTrajectoryState * FTS = TSOS.freeTrajectoryState();
GlobalVector JetDirection(direction);
TrajectoryStateOnSurface theTSOS = closestApproachToJet(*FTS, vertex, JetDirection,transientTrack.field());
theIsValid= theTSOS.isValid();
if(theIsValid){
GlobalVector D = distance(theTSOS, vertex, JetDirection);
GlobalVector J = JetDirection.unit();
GlobalPoint vertexPosition(vertex.x(),vertex.y(),vertex.z());
double theDistanceAlongJetAxis = J.dot(theTSOS.globalPosition()-vertexPosition);
theValue = D.mag()*(theDistanceAlongJetAxis/abs(theDistanceAlongJetAxis));
GlobalVector DD = D.unit();
GlobalPoint T0 = theTSOS.globalPosition();
GlobalVector T1 = theTSOS.globalMomentum();
GlobalVector TT1 = T1.unit();
GlobalVector Xi(T0.x()-vertex.position().x(),T0.y()-vertex.position().y(),T0.z()-vertex.position().z());
AlgebraicVector6 deriv;
AlgebraicVector3 deriv_v;
deriv_v[0] = - DD.x();
deriv_v[1] = - DD.y();
deriv_v[2] = - DD.z();
deriv[0] = DD.x();
deriv[1] = DD.y();
deriv[2] = DD.z();
deriv[3] = - (TT1.dot(Xi)*DD.x())/T1.mag();
deriv[4] = - (TT1.dot(Xi)*DD.y())/T1.mag();
deriv[5] = - (TT1.dot(Xi)*DD.z())/T1.mag();
double E1 = ROOT::Math::Similarity(deriv , theTSOS.cartesianError().matrix());
double E2 = ROOT::Math::Similarity(deriv_v , vertex.covariance());
// double E2 = RecoVertex::convertError(vertex.covariance()).matrix().similarity(deriv_v);
// double E2 = 0.; // no vertex error because of stupid use of hundreds of different types for same thing
theError = sqrt(E1+E2);
Measurement1D A(theValue, theError);
return pair<bool,Measurement1D>(theIsValid,A);
}
else {
return pair<bool,Measurement1D>(theIsValid,Measurement1D(0.,0.));
}// endif (isValid)
}
| TrajectoryStateOnSurface SignedImpactParameter3D::closestApproachToJet | ( | const FreeTrajectoryState & | aFTS, |
| const reco::Vertex & | vertex, | ||
| const GlobalVector & | aJetDirection, | ||
| const MagneticField * | field | ||
| ) | [static, private] |
Definition at line 86 of file SignedImpactParameter3D.cc.
References dir, AnalyticalTrajectoryExtrapolatorToLine::extrapolate(), pos, Vector3DBase< T, FrameTag >::unit(), reco::Vertex::x(), reco::Vertex::y(), and reco::Vertex::z().
{
GlobalVector J =aJetDirection.unit();
Line::PositionType pos(GlobalPoint(vertex.x(),vertex.y(),vertex.z()));
Line::DirectionType dir(J);
Line Jet(pos,dir);
AnalyticalTrajectoryExtrapolatorToLine TETL(field);
return TETL.extrapolate(aFTS, Jet);
}
| GlobalVector SignedImpactParameter3D::distance | ( | const TrajectoryStateOnSurface & | aTSOS, |
| const reco::Vertex & | vertex, | ||
| const GlobalVector & | aJetDirection | ||
| ) | [static, private] |
Definition at line 99 of file SignedImpactParameter3D.cc.
References funct::D, TrajectoryStateOnSurface::globalMomentum(), TrajectoryStateOnSurface::globalPosition(), csvLumiCalc::unit, reco::Vertex::x(), X, reco::Vertex::y(), and reco::Vertex::z().
{
Line::PositionType pos2(aTSOS.globalPosition());
Line::DirectionType dir2((aTSOS.globalMomentum()).unit());
Line T(pos2,dir2);
GlobalPoint X = GlobalPoint(vertex.x(),vertex.y(),vertex.z()); // aVertex.position();
GlobalVector D = T.distance(X);
return D;
}
| pair< double, Measurement1D > SignedImpactParameter3D::distanceWithJetAxis | ( | const reco::TransientTrack & | transientTrack, |
| const GlobalVector & | direction, | ||
| const reco::Vertex & | vertex | ||
| ) | [static] |
Return a pair: first is the decay length second is the distance of the track from jet axis
Definition at line 112 of file SignedImpactParameter3D.cc.
References IPTools::closestApproachToJet(), gather_cfg::cout, Vector3DBase< T, FrameTag >::cross(), dir, Line::distance(), Vector3DBase< T, FrameTag >::dot(), reco::TransientTrack::field(), TrajectoryStateOnSurface::freeTrajectoryState(), TrajectoryStateOnSurface::globalMomentum(), TrajectoryStateOnSurface::globalPosition(), reco::TransientTrack::impactPointState(), TrajectoryStateOnSurface::isValid(), metsig::jet, mag(), P, pos, Line::position(), ExpressReco_HICollisions_FallBack::track, csvLumiCalc::unit, Vector3DBase< T, FrameTag >::unit(), CommonMethods::weight(), PV3DBase< T, PVType, FrameType >::x(), reco::Vertex::x(), PV3DBase< T, PVType, FrameType >::y(), reco::Vertex::y(), PV3DBase< T, PVType, FrameType >::z(), and reco::Vertex::z().
{
double theDistanceAlongJetAxis(0.);
double theDistanceToJetAxis(0.);
double theLDist_err(0.);
TrajectoryStateOnSurface TSOS = track.impactPointState();
if ( !TSOS.isValid() ) {
cout << "====>>>> SignedImpactParameter3D::distanceWithJetAxis : TSOS not valid = " << TSOS.isValid() << endl ;
return pair<double,Measurement1D> (theDistanceAlongJetAxis,Measurement1D(theDistanceToJetAxis,theLDist_err));
}
FreeTrajectoryState * FTS = TSOS.freeTrajectoryState();
GlobalVector jetDirection(direction);
//
// Check whether the track has been used in the vertex
//
//FIXME
float weight=0.;//vertex.trackWeight(aRecTrack);
TrajectoryStateOnSurface stateAtOrigin = track.impactPointState();
TrajectoryStateOnSurface aTSOS = closestApproachToJet(*FTS, vertex, jetDirection, track.field());
bool isValid= stateAtOrigin.isValid();
// bool IsValid= aTSOS.isValid();
if(isValid){
//get the Track line at origin
Line::PositionType pos(stateAtOrigin.globalPosition());
Line::DirectionType dir((stateAtOrigin.globalMomentum()).unit());
Line track(pos,dir);
// get the Jet line
// Vertex vertex(vertex);
GlobalVector jetVector = jetDirection.unit();
Line::PositionType pos2(GlobalPoint(vertex.x(),vertex.y(),vertex.z()));
Line::DirectionType dir2(jetVector);
Line jet(pos2,dir2);
// now compute the distance between the two lines
// If the track has been used to refit the Primary vertex then sign it positively, otherwise negative
theDistanceToJetAxis = (jet.distance(track)).mag();
if (weight<1) theDistanceToJetAxis= -theDistanceToJetAxis;
// ... and the flight distance along the Jet axis.
GlobalPoint V = jet.position();
GlobalVector Q = dir - jetVector.dot(dir) * jetVector;
GlobalVector P = jetVector - jetVector.dot(dir) * dir;
theDistanceAlongJetAxis = P.dot(V-pos)/Q.dot(dir);
//
// get the covariance matrix of the vertex and compute the error on theDistanceToJetAxis
//
// build the vector of closest approach between lines
GlobalVector H((jetVector.cross(dir).unit()));
CLHEP::HepVector Hh(3);
Hh[0] = H.x();
Hh[1] = H.y();
Hh[2] = H.z();
// theLDist_err = sqrt(vertexError.similarity(Hh));
// cout << "distance to jet axis : "<< theDistanceToJetAxis <<" and error : "<< theLDist_err<<endl;
// Now the impact parameter ...
/* GlobalPoint T0 = track.position();
GlobalVector D = (T0-V)- (T0-V).dot(dir) * dir;
double IP = D.mag();
GlobalVector Dold = distance(aTSOS, aJet.vertex(), jetDirection);
double IPold = Dold.mag();
*/
}
Measurement1D DTJA(theDistanceToJetAxis,theLDist_err);
return pair<double,Measurement1D> (theDistanceAlongJetAxis,DTJA);
}
| int SignedImpactParameter3D::id | ( | void | ) | const [inline] |
Definition at line 23 of file SignedImpactParameter3D.h.
{return 2;}
1.7.3