tauImpactParameter::TrackTools Class Reference

#include <TrackTools.h>

Public Member Functions
	TrackTools ()
virtual	~TrackTools ()

Static Public Member Functions
static LorentzVectorParticle	lorentzParticleAtPosition (const TrackParticle &p, const TVector3 &v)
static TVector3	propagateToXPosition (const TrackParticle &p, double x)
static TVector3	propagateToYPosition (const TrackParticle &p, double y)
static TVector3	propagateToZPosition (const TrackParticle &p, double z)

Detailed Description

Definition at line 18 of file TrackTools.h.

Constructor & Destructor Documentation

TrackTools()

tauImpactParameter::TrackTools::TrackTools ( )

inline

Definition at line 20 of file TrackTools.h.

{};

~TrackTools()

virtual tauImpactParameter::TrackTools::~TrackTools ( )

inlinevirtual

Definition at line 21 of file TrackTools.h.

{};

Member Function Documentation

lorentzParticleAtPosition()

LorentzVectorParticle TrackTools::lorentzParticleAtPosition ( const TrackParticle &  p, const TVector3 &  v  )

static

Definition at line 52 of file TrackTools.cc.

                                                                                                     {
  TVectorT<double> FreePar(TrackHelixVertexFitter::NFreeTrackPar + TrackHelixVertexFitter::NExtraPar +
                           TrackHelixVertexFitter::MassOffSet);
  TMatrixTSym<double> FreeParCov(TrackHelixVertexFitter::NFreeTrackPar + TrackHelixVertexFitter::NExtraPar +
                                 TrackHelixVertexFitter::MassOffSet);
  FreePar(TrackHelixVertexFitter::x0) = v.X();
  FreePar(TrackHelixVertexFitter::y0) = v.Y();
  FreePar(TrackHelixVertexFitter::z0) = v.Z();
  FreePar(TrackHelixVertexFitter::kappa0) = p.parameter(TrackParticle::kappa);
  FreePar(TrackHelixVertexFitter::lambda0) = p.parameter(TrackParticle::lambda);
  FreePar(TrackHelixVertexFitter::phi0) = p.parameter(TrackParticle::phi);
  FreePar(TrackHelixVertexFitter::NFreeTrackPar + TrackHelixVertexFitter::MassOffSet) = p.mass();
  FreePar(TrackHelixVertexFitter::NFreeTrackPar + TrackHelixVertexFitter::BField0) = p.bField();
  TVectorT<double> LVPar = TrackHelixVertexFitter::computeLorentzVectorPar(FreePar);
  TMatrixTSym<double> LVCov =
      ErrorMatrixPropagator::propagateError(&TrackHelixVertexFitter::computeLorentzVectorPar, FreePar, FreeParCov);
  return LorentzVectorParticle(LVPar, LVCov, p.pdgId(), p.charge(), p.bField());
}

References tauImpactParameter::TrackHelixVertexFitter::BField0, tauImpactParameter::TrackHelixVertexFitter::computeLorentzVectorPar(), tauImpactParameter::TrackParticle::kappa, tauImpactParameter::TrackHelixVertexFitter::kappa0, tauImpactParameter::TrackParticle::lambda, tauImpactParameter::TrackHelixVertexFitter::lambda0, tauImpactParameter::TrackHelixVertexFitter::MassOffSet, tauImpactParameter::TrackHelixVertexFitter::NExtraPar, tauImpactParameter::TrackHelixVertexFitter::NFreeTrackPar, AlCaHLTBitMon_ParallelJobs::p, tauImpactParameter::TrackParticle::phi, tauImpactParameter::TrackHelixVertexFitter::phi0, tauImpactParameter::ErrorMatrixPropagator::propagateError(), findQualityFiles::v, tauImpactParameter::TrackHelixVertexFitter::x0, tauImpactParameter::TrackHelixVertexFitter::y0, and tauImpactParameter::TrackHelixVertexFitter::z0.

propagateToXPosition()

TVector3 TrackTools::propagateToXPosition ( const TrackParticle &  p, double  x  )

static

Definition at line 13 of file TrackTools.cc.

                                                                          {
  double kappa = p.parameter(TrackParticle::kappa);
  double lam = p.parameter(TrackParticle::lambda);
  double phi = p.parameter(TrackParticle::phi);
  double dxy = p.parameter(TrackParticle::dxy);
  double dz = p.parameter(TrackParticle::dz);
  double r = kappa / 2.0;
  double s = (asin((x + (r + dxy) * sin(phi)) / r) - phi) / (2 * kappa);
  double y = -r * cos(2.0 * s * kappa + phi) + (r + dxy) * cos(phi);
  double z = dz + s * tan(lam);
  return TVector3(x, y, z);
}

References funct::cos(), tauImpactParameter::TrackParticle::dxy, PVValHelper::dxy, tauImpactParameter::TrackParticle::dz, PVValHelper::dz, tauImpactParameter::TrackParticle::kappa, kappa, tauImpactParameter::TrackParticle::lambda, AlCaHLTBitMon_ParallelJobs::p, tauImpactParameter::TrackParticle::phi, alignCSCRings::r, alignCSCRings::s, funct::sin(), and funct::tan().

propagateToYPosition()

TVector3 TrackTools::propagateToYPosition ( const TrackParticle &  p, double  y  )

static

Definition at line 26 of file TrackTools.cc.

                                                                          {
  double kappa = p.parameter(TrackParticle::kappa);
  double lam = p.parameter(TrackParticle::lambda);
  double phi = p.parameter(TrackParticle::phi);
  double dxy = p.parameter(TrackParticle::dxy);
  double dz = p.parameter(TrackParticle::dz);
  double r = kappa / 2.0;
  double s = (acos(((r + dxy) * cos(phi) - y) / r) - phi) / (2 * kappa);
  double x = r * sin(2.0 * s * kappa + phi) - (r + dxy) * sin(phi);
  double z = dz + s * tan(lam);
  return TVector3(x, y, z);
}

References funct::cos(), tauImpactParameter::TrackParticle::dxy, PVValHelper::dxy, tauImpactParameter::TrackParticle::dz, PVValHelper::dz, tauImpactParameter::TrackParticle::kappa, kappa, tauImpactParameter::TrackParticle::lambda, AlCaHLTBitMon_ParallelJobs::p, tauImpactParameter::TrackParticle::phi, alignCSCRings::r, alignCSCRings::s, funct::sin(), and funct::tan().

propagateToZPosition()

TVector3 TrackTools::propagateToZPosition ( const TrackParticle &  p, double  z  )

static

Definition at line 39 of file TrackTools.cc.

                                                                          {
  double kappa = p.parameter(TrackParticle::kappa);
  double lam = p.parameter(TrackParticle::lambda);
  double phi = p.parameter(TrackParticle::phi);
  double dxy = p.parameter(TrackParticle::dxy);
  double dz = p.parameter(TrackParticle::dz);
  double s = (z - dz) / tan(lam);
  double r = kappa / 2.0;
  double x = r * sin(2.0 * s * kappa + phi) - (r + dxy) * sin(phi);
  double y = -r * cos(2.0 * s * kappa + phi) + (r + dxy) * cos(phi);
  return TVector3(x, y, z);
}

References funct::cos(), tauImpactParameter::TrackParticle::dxy, PVValHelper::dxy, tauImpactParameter::TrackParticle::dz, PVValHelper::dz, tauImpactParameter::TrackParticle::kappa, kappa, tauImpactParameter::TrackParticle::lambda, AlCaHLTBitMon_ParallelJobs::p, tauImpactParameter::TrackParticle::phi, alignCSCRings::r, alignCSCRings::s, funct::sin(), and funct::tan().