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CandCommonVertexFitterBase Class Reference

#include <PhysicsTools/RecoUtils/interface/CandCommonVertexFitter.h>

Inheritance diagram for CandCommonVertexFitterBase:

List of all members.

Public Types
typedef reco::Vertex::CovarianceMatrix	CovarianceMatrix
Public Member Functions
	CandCommonVertexFitterBase (const edm::ParameterSet &)
void	set (reco::VertexCompositeCandidate &) const
void	set (const MagneticField *bField)
virtual	~CandCommonVertexFitterBase ()
Protected Member Functions
void	fill (std::vector< reco::TransientTrack > &, std::vector< reco::Candidate * > &, std::vector< reco::RecoCandidate::TrackType > &, reco::Candidate &) const
virtual bool	fit (TransientVertex &, const std::vector< reco::TransientTrack > &) const =0
Protected Attributes
const MagneticField *	bField_
double	chi2_
	chi-sqared
CovarianceMatrix	cov_
	covariance matrix (3x3)
double	ndof_
	number of degrees of freedom

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Detailed Description

Definition at line 17 of file CandCommonVertexFitter.h.

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Member Typedef Documentation

typedef reco::Vertex::CovarianceMatrix CandCommonVertexFitterBase::CovarianceMatrix

Definition at line 19 of file CandCommonVertexFitter.h.

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Constructor & Destructor Documentation

CandCommonVertexFitterBase::CandCommonVertexFitterBase

(

const edm::ParameterSet &

)

[inline]

Definition at line 20 of file CandCommonVertexFitter.h.

: bField_(0) { }

virtual CandCommonVertexFitterBase::~CandCommonVertexFitterBase

(

)

[inline, virtual]

Definition at line 21 of file CandCommonVertexFitter.h.

{ }

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Member Function Documentation

void CandCommonVertexFitterBase::fill	(	std::vector< reco::TransientTrack > &	,
		std::vector< reco::Candidate * > &	,
		std::vector< reco::RecoCandidate::TrackType > &	,
		reco::Candidate &
	)			const [protected]

Referenced by set().

virtual bool CandCommonVertexFitterBase::fit	(	TransientVertex &	,
		const std::vector< reco::TransientTrack > &
	)			const [protected, pure virtual]

Implemented in CandCommonVertexFitter< Fitter >.

Referenced by set().

void CandCommonVertexFitterBase::set

(

reco::VertexCompositeCandidate &

c

)

const

Definition at line 9 of file CandCommonVertexFitter.cc.

References bField_, reco::Vertex::chi2(), chi2_, cov_, lat::endl(), reco::Particle::energy(), relval_parameters_module::energy, fill(), reco::Vertex::fill(), fit(), edm::errors::InvalidReference, reco::Particle::mass(), reco::Vertex::ndof(), ndof_, reco::TrackBase::p(), p, reco::TrackBase::px(), reco::TrackBase::py(), reco::TrackBase::pz(), scale, reco::VertexCompositeCandidate::setChi2AndNdof(), reco::VertexCompositeCandidate::setCovariance(), reco::Particle::setP4(), reco::Particle::setVertex(), funct::sqrt(), track, tracks, and v.

                                                                       {
  if(bField_ == 0)
    throw edm::Exception(edm::errors::InvalidReference)
      << "B-Field was not set up CandCommonVertexFitter.\n"
      << "the following method must be called before fitting a candidate:\n"
      << " CandCommonVertexFitter:.set( const MagneticField * )" << endl;
  vector<TransientTrack> tracks;
  vector<Candidate *> daughters;
  vector<RecoCandidate::TrackType> trackTypes;
  fill(tracks, daughters, trackTypes, c);
  assert(tracks.size() == daughters.size());
  TransientVertex vertex;
  if(fit(vertex, tracks)) {
    tracks = vertex.refittedTracks();    
    Candidate::Point vtx(vertex.position());
    c.setVertex(vtx);
    vector<TransientTrack>::const_iterator trackIt = tracks.begin(), tracksEnd = tracks.end();
    vector<Candidate *>::const_iterator daughterIt = daughters.begin();
    vector<RecoCandidate::TrackType>::const_iterator trackTypeIt = trackTypes.begin();
    Candidate::LorentzVector mp4(0, 0, 0, 0);
    for(; trackIt != tracksEnd; ++ trackIt, ++ daughterIt, ++trackTypeIt) {
      const Track & track = trackIt->track();
      Candidate & daughter = * * daughterIt;
      double px = track.px(), py = track.py(), pz = track.pz(), p = track.p();
      double energy;
      daughter.setVertex( vtx );
      if(*trackTypeIt == RecoCandidate::recoTrackType) {
        double mass = daughter.mass();
        energy = sqrt(p*p + mass*mass);
      } else {
        energy = daughter.energy();
        double scale = energy / p;
        px *= scale; py *= scale; pz *= scale; 
      }
      Candidate::LorentzVector dp4(px, py, pz, energy);
      daughter.setP4(dp4);
      mp4 += dp4;
    }
    c.setP4(mp4);
    Vertex v = vertex;
    c.setChi2AndNdof(chi2_ = v.chi2(), ndof_ = v.ndof());
    v.fill(cov_);
    c.setCovariance(cov_);
  } else {
    c.setChi2AndNdof(chi2_ = -1, ndof_ = 0);
    c.setCovariance(cov_ = CovarianceMatrix(ROOT::Math::SMatrixIdentity())); 
  }
}

void CandCommonVertexFitterBase::set

(

const MagneticField *

bField

)

[inline]

Definition at line 22 of file CandCommonVertexFitter.h.

References bField_.

Referenced by reco::modules::CandVertexFitterEventSetupInit< Fitter >::init().

{ bField_ = bField; }

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Member Data Documentation

const MagneticField* CandCommonVertexFitterBase::bField_ [protected]

Definition at line 26 of file CandCommonVertexFitter.h.

Referenced by set().

double CandCommonVertexFitterBase::chi2_ [mutable, protected]

chi-sqared

Definition at line 34 of file CandCommonVertexFitter.h.

Referenced by set().

CovarianceMatrix CandCommonVertexFitterBase::cov_ [mutable, protected]

covariance matrix (3x3)

Definition at line 38 of file CandCommonVertexFitter.h.

Referenced by set().

double CandCommonVertexFitterBase::ndof_ [mutable, protected]

number of degrees of freedom

Definition at line 36 of file CandCommonVertexFitter.h.

Referenced by set().

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The documentation for this class was generated from the following files:

• PhysicsTools/RecoUtils/interface/CandCommonVertexFitter.h
• PhysicsTools/RecoUtils/src/CandCommonVertexFitter.cc

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