tauImpactParameter::Chi2VertexFitter Class Reference

#include <Chi2VertexFitter.h>

Inheritance diagram for tauImpactParameter::Chi2VertexFitter:

Public Member Functions
	Chi2VertexFitter (const std::vector< TrackParticle > &particles, const TVector3 &vguess, double nsigma=4.0)
virtual bool	fit ()
virtual	~Chi2VertexFitter ()
Public Member Functions inherited from tauImpactParameter::TrackHelixVertexFitter
virtual double	chiSquare ()
LorentzVectorParticle	getMother (int pdgid)
std::vector < LorentzVectorParticle >	getRefitLorentzVectorParticles ()
virtual std::vector < TrackParticle >	getRefitTracks ()
virtual TVector3	getVertex ()
virtual TMatrixTSym< double >	getVertexError ()
virtual double	ndf ()
	TrackHelixVertexFitter (const std::vector< TrackParticle > &particles, const TVector3 &vguess)
virtual double	updateChisquare (const TVectorT< double > &inpar)
virtual	~TrackHelixVertexFitter ()

Private Attributes
double	nsigma_

Additional Inherited Members
Public Types inherited from tauImpactParameter::TrackHelixVertexFitter
enum	ExtraPar { BField0 =0, MassOffSet =1, NExtraPar =1 }
enum	FreeTrackPar { kappa0 =3, lambda0, phi0, NFreeTrackPar }
enum	FreeVertexPar { x0 =0, y0, z0, NFreeVertexPar }
Static Public Member Functions inherited from tauImpactParameter::TrackHelixVertexFitter
static void	computedxydz (const TVectorT< double > &inpar, int particle, double &kappa, double &lam, double &phi, double &x, double &y, double &z, double &s, double &dxy, double &dz)
static TVectorT< double >	computeLorentzVectorPar (const TVectorT< double > &inpar)
Protected Member Functions inherited from tauImpactParameter::TrackHelixVertexFitter
virtual TString	freeParName (int Par)
Protected Attributes inherited from tauImpactParameter::TrackHelixVertexFitter
double	chi2_
bool	isConfigured_
bool	isFit_
double	ndf_
TVectorT< double >	par_
TMatrixTSym< double >	parcov_

Detailed Description

Definition at line 16 of file Chi2VertexFitter.h.

Constructor & Destructor Documentation

tauImpactParameter::Chi2VertexFitter::Chi2VertexFitter ( const std::vector< TrackParticle > &  particles, const TVector3 &  vguess, double  nsigma = 4.0  )

inline

Definition at line 18 of file Chi2VertexFitter.h.

    : TrackHelixVertexFitter(particles,vguess),
      nsigma_(nsigma)
  {};

virtual tauImpactParameter::Chi2VertexFitter::~Chi2VertexFitter ( )

inlinevirtual

Definition at line 22 of file Chi2VertexFitter.h.

{};

Member Function Documentation

bool Chi2VertexFitter::fit ( )

virtual

Implements tauImpactParameter::TrackHelixVertexFitter.

Definition at line 26 of file Chi2VertexFitter.cc.

References tauImpactParameter::TrackHelixVertexFitter::chi2_, tauImpactParameter::TrackHelixVertexFitter::freeParName(), i, tauImpactParameter::TrackHelixVertexFitter::isConfigured_, tauImpactParameter::TrackHelixVertexFitter::isFit_, j, bookConverter::max, min(), mergeVDriftHistosByStation::name, nsigma_, tauImpactParameter::TrackHelixVertexFitter::par_, tauImpactParameter::TrackHelixVertexFitter::parcov_, mathSSE::sqrt(), and tauImpactParameter::ChiSquareFunctionUpdator::Up().

                          {
  if(isFit_==true) return true;// do not refit
  if(!isConfigured_) return false; // do not fit if configuration failed
  ChiSquareFunctionUpdator updator(this);
  ROOT::Minuit2::MnUserParameters MnPar;
  for(int i=0;i<par_.GetNrows();i++){
    TString name=freeParName(i);
    // if not limited (vhigh <= vlow)
    MnPar.Add(name.Data(),par_(i),sqrt(fabs(parcov_(i,i))),par_(i)-nsigma_*sqrt(fabs(parcov_(i,i))),par_(i)+nsigma_*sqrt(fabs(parcov_(i,i))));
  }

  unsigned int max=10;
  int numberofcalls=200+par_.GetNrows()*100+par_.GetNrows()*par_.GetNrows()*5;
  double tolerance(0.01);
  double edmMin(0.001*updator.Up()*tolerance); 

  ROOT::Minuit2::MnMinimize minimize(updator,MnPar);
  ROOT::Minuit2::FunctionMinimum min= minimize(numberofcalls,tolerance);
  for(unsigned int i=0;i<=max && min.Edm()>edmMin;i++){
    if(i==max) return false;
    min = minimize(i*numberofcalls,tolerance);
  }
  // give return flag based on status
  if(min.IsAboveMaxEdm()){edm::LogWarning("Chi2VertexFitter::Fit") << "Found Vertex that is above EDM " << std::endl; return false;}
  if(!min.IsValid()){
    edm::LogWarning("Chi2VertexFitter::Fit") << "Failed min.IsValid()" << std::endl; 
    if(!min.HasValidParameters()){edm::LogWarning("Chi2VertexFitter::Fit") << "Failed min.HasValidParameters()" << std::endl; }
    if(!min.HasValidCovariance()){edm::LogWarning("Chi2VertexFitter::Fit") << "Failed min.HasValidCovariance()" << std::endl; }
    if(!min.HesseFailed()){edm::LogWarning("Chi2VertexFitter::Fit") << "Failed min.HesseFailed()" << std::endl; }
    if(!min.HasReachedCallLimit()){edm::LogWarning("Chi2VertexFitter::Fit") << "Failed min.HasReachedCallLimit()" << std::endl; }
    return false;
  }
  chi2_=min.Fval();
  // Get output parameters
  for(int i=0;i<par_.GetNrows();i++){ par_(i)=min.UserParameters().Value(i);}
  // Get output covariance
  for(int i=0;i<par_.GetNrows();i++){
    for(int j=0;j<par_.GetNrows();j++){
      parcov_(i,j)=min.UserCovariance()(i,j);
    }
  }

  isFit_=true;
  return isFit_;
}

Member Data Documentation

double tauImpactParameter::Chi2VertexFitter::nsigma_

private

Definition at line 27 of file Chi2VertexFitter.h.

Referenced by fit().