TSCBLBuilderWithPropagator Class Reference

#include <TSCBLBuilderWithPropagator.h>

Inheritance diagram for TSCBLBuilderWithPropagator:

Public Member Functions
TrajectoryStateClosestToBeamLine	operator() (const FTS &originalFTS, const reco::BeamSpot &beamSpot) const override
	TSCBLBuilderWithPropagator (const MagneticField *field)
	constructor with default geometrical propagator More...
	TSCBLBuilderWithPropagator (const Propagator &u)
	constructor with user-supplied propagator More...
	~TSCBLBuilderWithPropagator () override
Public Member Functions inherited from TrajectoryStateClosestToBeamLineBuilder
virtual	~TrajectoryStateClosestToBeamLineBuilder ()=default

Private Attributes
DeepCopyPointerByClone < Propagator >	thePropagator

Additional Inherited Members
Public Types inherited from TrajectoryStateClosestToBeamLineBuilder
typedef FreeTrajectoryState	FTS

Detailed Description

This class builds a TrajectoryStateClosestToBeamLine given an original FreeTrajectoryState. This new state is then defined at the point of closest approach to the beam line. It is to be used when a specific propagator has to be used.

Definition at line 16 of file TSCBLBuilderWithPropagator.h.

Constructor & Destructor Documentation

TSCBLBuilderWithPropagator::TSCBLBuilderWithPropagator

(

const MagneticField *

field

)

constructor with default geometrical propagator

Definition at line 8 of file TSCBLBuilderWithPropagator.cc.

    : thePropagator(new AnalyticalPropagator(field, anyDirection)) {}

TSCBLBuilderWithPropagator::TSCBLBuilderWithPropagator

(

const Propagator &

u

)

constructor with user-supplied propagator

Definition at line 11 of file TSCBLBuilderWithPropagator.cc.

References anyDirection, Propagator::setPropagationDirection(), and thePropagator.

                                                                          : thePropagator(u.clone()) {
  thePropagator->setPropagationDirection(anyDirection);
}

TSCBLBuilderWithPropagator::~TSCBLBuilderWithPropagator ( )

inlineoverride

Definition at line 24 of file TSCBLBuilderWithPropagator.h.

{};

Member Function Documentation

TrajectoryStateClosestToBeamLine TSCBLBuilderWithPropagator::operator() ( const FTS &  originalFTS, const reco::BeamSpot &  beamSpot  ) const

overridevirtual

Implements TrajectoryStateClosestToBeamLineBuilder.

Definition at line 15 of file TSCBLBuilderWithPropagator.cc.

References Line::direction(), Vector3DBase< T, FrameTag >::dot(), reco::BeamSpot::dxdz(), reco::BeamSpot::dydz(), TrajectoryExtrapolatorToLine::extrapolate(), TrajectoryStateOnSurface::freeState(), TrajectoryStateOnSurface::globalPosition(), TrajectoryStateOnSurface::isValid(), cmsLHEtoEOSManager::l, reco::BeamSpot::position(), thePropagator, cmsswSequenceInfo::tp, PV3DBase< T, PVType, FrameType >::x(), PV3DBase< T, PVType, FrameType >::y(), and PV3DBase< T, PVType, FrameType >::z().

                                                                                                            {
  GlobalPoint bspos(beamSpot.position().x(), beamSpot.position().y(), beamSpot.position().z());
  GlobalVector bsvec(beamSpot.dxdz(), beamSpot.dydz(), 1.);
  Line bsline(bspos, bsvec);

  TrajectoryExtrapolatorToLine tetl;

  TrajectoryStateOnSurface tsosfinal = tetl.extrapolate(originalFTS, bsline, *thePropagator);

  if (!tsosfinal.isValid())
    return TrajectoryStateClosestToBeamLine();

  //Compute point on beamline of closest approach
  GlobalPoint tp = tsosfinal.globalPosition();  //position of trajectory closest approach
  GlobalVector hyp(
      tp.x() - bspos.x(), tp.y() - bspos.y(), tp.z() - bspos.z());  //difference between traj and beamline reference
  double l = bsline.direction().dot(hyp);                           //length along beamline away from reference point
  GlobalPoint closepoint = bspos + l * bsvec;

  //Get the free state and return the TSCBL
  const FreeTrajectoryState theFTS = *tsosfinal.freeState();
  return TrajectoryStateClosestToBeamLine(theFTS, closepoint, beamSpot);
}

Member Data Documentation

DeepCopyPointerByClone<Propagator> TSCBLBuilderWithPropagator::thePropagator

private

Definition at line 29 of file TSCBLBuilderWithPropagator.h.

Referenced by operator()(), and TSCBLBuilderWithPropagator().