PFGsfHelper Class Reference

#include <PFGsfHelper.h>

Public Member Functions
GlobalVector	computeP (bool ComputeMode) const
double	fittedDP () const
bool	isValid () const
	PFGsfHelper (const TrajectoryMeasurement &)
double	sigmafittedDP () const
	~PFGsfHelper ()

Private Member Functions
void	computeQpMode (const TrajectoryStateOnSurface tsos, AlgebraicVector5 &parameters, AlgebraicSymMatrix55 &covariance) const

Private Attributes
double	dp
float	mode_Px
float	mode_Py
float	mode_Pz
double	sigmaDp
TrajectoryStateOnSurface	theBackwardState
TrajectoryStateOnSurface	theForwardState
TrajectoryStateOnSurface	theUpdateState
bool	Valid

Detailed Description

Definition at line 29 of file PFGsfHelper.h.

Constructor & Destructor Documentation

PFGsfHelper()

PFGsfHelper::PFGsfHelper

(

const TrajectoryMeasurement &

tm

)

Definition at line 32 of file PFGsfHelper.cc.

                                                        {
  /* LogInfo("PFGsfHelper")<<" PFGsfHelper  built"; */
 
  // TrajectoryStateOnSurface theUpdateState = tm.forwardPredictedState();
  theUpdateState = tm.updatedState();
  theForwardState = tm.forwardPredictedState();
  theBackwardState = tm.backwardPredictedState();
 
  Valid = true;
  if (!theUpdateState.isValid() || !theForwardState.isValid() || !theBackwardState.isValid())
    Valid = false;
 
  if (Valid) {
    mode_Px = 0.;
    mode_Py = 0.;
    mode_Pz = 0.;
    GetComponents comps(theUpdateState);
    auto const& components = comps();
    auto numb = components.size();
    std::vector<SingleGaussianState1D> pxStates;
    pxStates.reserve(numb);
    std::vector<SingleGaussianState1D> pyStates;
    pyStates.reserve(numb);
    std::vector<SingleGaussianState1D> pzStates;
    pzStates.reserve(numb);
    for (auto ic = components.begin(); ic != components.end(); ++ic) {
      GlobalVector momentum(ic->globalMomentum());
      AlgebraicSymMatrix66 cov(ic->cartesianError().matrix());
      pxStates.push_back(SingleGaussianState1D(momentum.x(), cov(3, 3), ic->weight()));
      pyStates.push_back(SingleGaussianState1D(momentum.y(), cov(4, 4), ic->weight()));
      pzStates.push_back(SingleGaussianState1D(momentum.z(), cov(5, 5), ic->weight()));
      //    cout<<"COMP "<<momentum<<endl;
    }
    MultiGaussianState1D pxState(pxStates);
    MultiGaussianState1D pyState(pyStates);
    MultiGaussianState1D pzState(pzStates);
    GaussianSumUtilities1D pxUtils(pxState);
    GaussianSumUtilities1D pyUtils(pyState);
    GaussianSumUtilities1D pzUtils(pzState);
    mode_Px = pxUtils.mode().mean();
    mode_Py = pyUtils.mode().mean();
    mode_Pz = pzUtils.mode().mean();
 
    dp = 0.;
    sigmaDp = 0.;
 
    //
    // prepare input parameter vectors and covariance matrices
    //
 
    AlgebraicVector5 fwdPars = theForwardState.localParameters().vector();
    AlgebraicSymMatrix55 fwdCov = theForwardState.localError().matrix();
    computeQpMode(theForwardState, fwdPars, fwdCov);
    AlgebraicVector5 bwdPars = theBackwardState.localParameters().vector();
    AlgebraicSymMatrix55 bwdCov = theBackwardState.localError().matrix();
    computeQpMode(theBackwardState, bwdPars, bwdCov);
    LocalPoint hitPos(0., 0., 0.);
    LocalError hitErr(-1., -1., -1.);
    if (tm.recHit()->isValid()) {
      hitPos = tm.recHit()->localPosition();
      hitErr = tm.recHit()->localPositionError();
    }
 
    CollinearFitAtTM collinearFit;
    CollinearFitAtTM::ResultVector fitParameters;
    CollinearFitAtTM::ResultMatrix fitCovariance;
    double fitChi2;
    bool CollFit = true;
    if (!collinearFit.fit(fwdPars, fwdCov, bwdPars, bwdCov, hitPos, hitErr, fitParameters, fitCovariance, fitChi2))
      CollFit = false;
 
    if (CollFit) {
      double qpIn = fitParameters(0);
      double sig2In = fitCovariance(0, 0);
      double qpOut = fitParameters(1);
      double sig2Out = fitCovariance(1, 1);
      double corrInOut = fitCovariance(0, 1);
      double pIn = 1. / fabs(qpIn);
      double pOut = 1. / fabs(qpOut);
      double sig2DeltaP = pIn / qpIn * pIn / qpIn * sig2In - 2 * pIn / qpIn * pOut / qpOut * corrInOut +
                          pOut / qpOut * pOut / qpOut * sig2Out;
      //   std::cout << "fitted delta p = " << pOut-pIn << " sigma = "
      //        << sqrt(sig2DeltaP) << std::endl;
      dp = pOut - pIn;
      sigmaDp = sqrt(sig2DeltaP);
    }
  }
}

References TrajectoryMeasurement::backwardPredictedState(), makeMuonMisalignmentScenario::components, Calorimetry_cff::dp, CollinearFitAtTM::fit(), fitChi2(), L1TRate_cfi::fitParameters, TrajectoryMeasurement::forwardPredictedState(), SingleGaussianState1D::mean(), GaussianSumUtilities1D::mode(), L1TrackObjectNtupleMaker_cfg::pOut, TrajectoryMeasurement::recHit(), mathSSE::sqrt(), and TrajectoryMeasurement::updatedState().

~PFGsfHelper()

PFGsfHelper::~PFGsfHelper

(

)

Definition at line 121 of file PFGsfHelper.cc.

{}

Member Function Documentation

computeP()

GlobalVector PFGsfHelper::computeP

(

bool

ComputeMode

)

const

Definition at line 122 of file PFGsfHelper.cc.

                                                         {
  GlobalVector gsfp;
  if (ComputeMode)
    gsfp = GlobalVector(mode_Px, mode_Py, mode_Pz);
  else
    gsfp = theUpdateState.globalMomentum();
  return gsfp;
}

Referenced by PFTrackTransformer::addPointsAndBrems().

computeQpMode()

void PFGsfHelper::computeQpMode ( const TrajectoryStateOnSurface  tsos, AlgebraicVector5 &  parameters, AlgebraicSymMatrix55 &  covariance  ) const

private

Definition at line 134 of file PFGsfHelper.cc.

                                                                        {
  //
  // parameters and errors from combined state
  //
  parameters = tsos.localParameters().vector();
  covariance = tsos.localError().matrix();
  //
  // mode for parameter 0 (q/p)
  //
  MultiGaussianState1D qpState(MultiGaussianStateTransform::multiState1D(tsos, 0));
  GaussianSumUtilities1D qpGS(qpState);
  if (!qpGS.modeIsValid())
    return;
  double qp = qpGS.mode().mean();
  double varQp = qpGS.mode().variance();
  //
  // replace q/p value and variance, rescale correlation terms
  //   (heuristic procedure - alternative would be mode in 5D ...)
  //
  double VarQpRatio = sqrt(varQp / covariance(0, 0));
  parameters(0) = qp;
  covariance(0, 0) = varQp;
  for (int i = 1; i < 5; ++i)
    covariance(i, 0) *= VarQpRatio;
  //   std::cout << "covariance " << VarQpRatio << " "
  //        << covariance(1,0) << " " << covariance(0,1) << std::endl;
}

References mps_fire::i, TrajectoryStateOnSurface::localError(), TrajectoryStateOnSurface::localParameters(), LocalTrajectoryError::matrix(), SingleGaussianState1D::mean(), GaussianSumUtilities1D::mode(), GaussianSumUtilities1D::modeIsValid(), MultiGaussianStateTransform::multiState1D(), mathSSE::sqrt(), SingleGaussianState1D::variance(), and LocalTrajectoryParameters::vector().

fittedDP()

double PFGsfHelper::fittedDP

(

)

const

Definition at line 130 of file PFGsfHelper.cc.

{ return dp; }

References Calorimetry_cff::dp.

Referenced by PFTrackTransformer::addPointsAndBrems().

isValid()

bool PFGsfHelper::isValid

(

void

)

const

Definition at line 132 of file PFGsfHelper.cc.

{ return Valid; }

Referenced by ntupleDataFormat._Object::_checkIsValid(), and core.AutoHandle.AutoHandle::ReallyLoad().

sigmafittedDP()

double PFGsfHelper::sigmafittedDP

(

)

const

Definition at line 131 of file PFGsfHelper.cc.

{ return sigmaDp; }

Referenced by PFTrackTransformer::addPointsAndBrems().

Member Data Documentation

dp

double PFGsfHelper::dp

private

Definition at line 48 of file PFGsfHelper.h.

mode_Px

float PFGsfHelper::mode_Px

private

Definition at line 44 of file PFGsfHelper.h.

mode_Py

float PFGsfHelper::mode_Py

private

Definition at line 45 of file PFGsfHelper.h.

mode_Pz

float PFGsfHelper::mode_Pz

private

Definition at line 46 of file PFGsfHelper.h.

sigmaDp

double PFGsfHelper::sigmaDp

private

Definition at line 49 of file PFGsfHelper.h.

theBackwardState

TrajectoryStateOnSurface PFGsfHelper::theBackwardState

private

Definition at line 52 of file PFGsfHelper.h.

theForwardState

TrajectoryStateOnSurface PFGsfHelper::theForwardState

private

Definition at line 51 of file PFGsfHelper.h.

theUpdateState

TrajectoryStateOnSurface PFGsfHelper::theUpdateState

private

Definition at line 50 of file PFGsfHelper.h.

Valid

bool PFGsfHelper::Valid

private

Definition at line 47 of file PFGsfHelper.h.