Struct to hold variables for intersection points. More...

#include <PXDPerformanceStructs.h>

Public Member Functions
	TrackPoint_t ()
	Default constructor.

RecoTrack *	setValues (const PXDIntercept &pxdIntercept, const std::string &recoTracksName="", const double &mass=Const::electronMass)
	Update values from a PXDCluster.

Public Attributes
float	x
	Global position in x.

float	y
	Global position in y.

float	z
	Global position in z.

float	tol
	The variables below are included here as they can be calculated w.o.

float	chargeMPV
	Expected charge in ADU.

bool	inside
	True if it's inside the active region.

Detailed Description

Struct to hold variables for intersection points.

Definition at line 57 of file PXDPerformanceStructs.h.

Constructor & Destructor Documentation

◆ TrackPoint_t()

TrackPoint_t ( )

inline

Default constructor.

Definition at line 60 of file PXDPerformanceStructs.h.

60 : x(0.0), y(0.0), z(0.0),

61 tol(0.0), chargeMPV(0.0), inside(false) {}

Belle2::PXD::TrackPoint_t::inside

bool inside

True if it's inside the active region.

Definition: PXDPerformanceStructs.h:81

Belle2::PXD::TrackPoint_t::chargeMPV

float chargeMPV

Expected charge in ADU.

Definition: PXDPerformanceStructs.h:80

Belle2::PXD::TrackPoint_t::tol

float tol

The variables below are included here as they can be calculated w.o.

Definition: PXDPerformanceStructs.h:79

Belle2::PXD::TrackPoint_t::y

float y

Global position in y.

Definition: PXDPerformanceStructs.h:73

Belle2::PXD::TrackPoint_t::x

float x

Global position in x.

Definition: PXDPerformanceStructs.h:72

Belle2::PXD::TrackPoint_t::z

float z

Global position in z.

Definition: PXDPerformanceStructs.h:74

Member Function Documentation

◆ setValues()

RecoTrack * setValues	(	const PXDIntercept &	pxdIntercept,
		const std::string &	recoTracksName = `""`,
		const double &	mass = `Const::electronMass`
	)

Update values from a PXDCluster.

Parameters

pxdIntercept	a PXDIntercept object.
recoTracksName	Name of RecoTrack collection
mass	Mass of the impinging particle

Returns: the pointer of the related RecoTrack object.

Definition at line 33 of file PXDPerformanceStructs.cc.

    {
      // Construct VxdID from its baseType (unsigned short)
      VxdID sensorID(pxdIntercept.getSensorID());
 
      //RelationVector<RecoTrack>
      // DataStore::getRelationsWithObj<RecoTrack>(pxdIntercept);
      auto recoTracks = pxdIntercept.getRelationsFrom<RecoTrack>(recoTracksName);
 
      // The recoTracks collection shouldn't be empty
      if (!recoTracks.size()) return nullptr;
 
      // Propogate a track state back to the module of interest
      // as PXDIntercept doesn't contain global track point,
      // cos(incident angle), and the expected charge from the hit.
      const VXD::SensorInfoBase& sensorInfo = VXD::GeoCache::getInstance().get(sensorID);
      auto statePtr = getTrackStateOnModule(sensorInfo, *recoTracks[0]);
      if (statePtr == nullptr) return nullptr; // shouldn't happen.
      auto intersec = statePtr -> getPos();
      auto localPoint = sensorInfo.pointToLocal(ROOT::Math::XYZVector(intersec), true);
      auto intersec_p = statePtr -> getMom();
      auto local_p = sensorInfo.vectorToLocal(ROOT::Math::XYZVector(intersec_p), true);
 
      //inside = sensorInfo.inside(localPoint.X(), localPoint.Y(), 0., 0.);
      inside = sensorInfo.inside(localPoint.X(), localPoint.Y());
      x = intersec.X();
      y = intersec.Y();
      z = intersec.Z();
      tol = cos(local_p.Theta());
 
      // Estimate the charge MPV (in ADU) of the hit.
      double length = sensorInfo.getThickness() / tol; // track path length
      auto ADUToEnergy = PXD::PXDGainCalibrator::getInstance().getADUToEnergy(sensorID,
                         sensorInfo.getUCellID(pxdIntercept.getCoorU()),
                         sensorInfo.getVCellID(pxdIntercept.getCoorV()));
      chargeMPV = getDeltaP(intersec_p.Mag(), length, mass) / ADUToEnergy;
 
      // Return pointer of the relatd RecoTrack for accessing additional info.
      return recoTracks[0];
    }

Member Data Documentation

◆ chargeMPV

float chargeMPV

Expected charge in ADU.

Definition at line 80 of file PXDPerformanceStructs.h.

◆ inside

bool inside

True if it's inside the active region.

Definition at line 81 of file PXDPerformanceStructs.h.

◆ tol

float tol

The variables below are included here as they can be calculated w.o.

having a track cluster. cos(incident angle) = thickness/path length.

Definition at line 79 of file PXDPerformanceStructs.h.

◆ x