CandCommonVertexFitterBase Class Reference

#include <CandCommonVertexFitter.h>

Inheritance diagram for CandCommonVertexFitterBase:

Public Types
typedef reco::Vertex::CovarianceMatrix	CovarianceMatrix

Public Member Functions
	CandCommonVertexFitterBase (const edm::ParameterSet &)
void	set (const MagneticField *bField)
void	set (reco::VertexCompositeCandidate &) const
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 More...
CovarianceMatrix	cov_
	covariance matrix (3x3) More...
double	ndof_
	number of degrees of freedom More...

Detailed Description

Definition at line 17 of file CandCommonVertexFitter.h.

Member Typedef Documentation

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

Definition at line 19 of file CandCommonVertexFitter.h.

Constructor & Destructor Documentation

CandCommonVertexFitterBase::CandCommonVertexFitterBase ( const edm::ParameterSet &  )

inline

Definition at line 20 of file CandCommonVertexFitter.h.

: bField_(0) { }

virtual CandCommonVertexFitterBase::~CandCommonVertexFitterBase ( )

inlinevirtual

Definition at line 21 of file CandCommonVertexFitter.h.

{ }

Member Function Documentation

void CandCommonVertexFitterBase::fill ( std::vector< reco::TransientTrack > &  tracks, std::vector< reco::Candidate * > &  daughters, std::vector< reco::RecoCandidate::TrackType > &  trackTypes, reco::Candidate &  c  ) const

protected

Definition at line 58 of file CandCommonVertexFitter.cc.

References ExpressReco_HICollisions_FallBack::cerr, debug_cff::d1, reco::Candidate::daughter(), edm::hlt::Exception, reco::Candidate::get(), edm::errors::InvalidReference, j, argparse::message, reco::Candidate::numberOfDaughters(), and reco::Candidate::pdgId().

                                           {
  size_t nDau = c.numberOfDaughters();
  for(unsigned int j = 0; j < nDau ; ++j) {
    Candidate * d = c.daughter(j);
    if(d == 0) {
      ostringstream message;
      message << "Can't access in write mode candidate daughters. "
          << "pdgId = " << c.pdgId() << ".\n";
      const Candidate * d1 = c.daughter(j);
      if(d1 == 0)
    message << "Null daughter also found in read-only mode\n";
      else
    message << "Daughter found in read-only mode with id: " << d1->pdgId() << "\n";
      throw edm::Exception(edm::errors::InvalidReference) << message.str();
    }
    if(d->numberOfDaughters() > 0)
      fill(tracks, daughters, trackTypes, * d);
    else {
      const Track * trk = d->get<const Track *>();
      RecoCandidate::TrackType type = d->get<RecoCandidate::TrackType>();
      if(trk != 0) {
    tracks.push_back(TransientTrack(* trk, bField_));
    daughters.push_back(d);
    trackTypes.push_back(type);
      } else {
    cerr << ">>> warning: candidate of type " << d->pdgId() 
         << " has no track reference." << endl;
      }
    }
  }
}

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

protectedpure virtual

Implemented in CandCommonVertexFitter< Fitter >.

void CandCommonVertexFitterBase::set ( const MagneticField *  bField )

inline

Definition at line 22 of file CandCommonVertexFitter.h.

References ecalTB2006H4_GenSimDigiReco_cfg::bField, and bField_.

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

{ bField_ = bField; }

void CandCommonVertexFitterBase::set

(

reco::VertexCompositeCandidate &

c

)

const

Definition at line 9 of file CandCommonVertexFitter.cc.

References reco::Vertex::chi2(), relval_parameters_module::energy, reco::Candidate::energy(), edm::hlt::Exception, reco::Vertex::fill(), edm::errors::InvalidReference, reco::Candidate::mass(), reco::Vertex::ndof(), L1TEmulatorMonitor_cff::p, reco::TrackBase::p(), reco::TrackBase::px(), reco::TrackBase::py(), reco::TrackBase::pz(), reco::RecoCandidate::recoTrackType, TransientVertex::refittedTracks(), reco::VertexCompositeCandidate::setChi2AndNdof(), reco::VertexCompositeCandidate::setCovariance(), reco::Candidate::setP4(), reco::LeafCandidate::setP4(), reco::Candidate::setVertex(), reco::LeafCandidate::setVertex(), mathSSE::sqrt(), ExpressReco_HICollisions_FallBack::track, testEve_cfg::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())); 
  }
}

Member Data Documentation

const MagneticField* CandCommonVertexFitterBase::bField_

protected

Definition at line 26 of file CandCommonVertexFitter.h.

Referenced by set().

double CandCommonVertexFitterBase::chi2_

mutableprotected

chi-sqared

Definition at line 34 of file CandCommonVertexFitter.h.

CovarianceMatrix CandCommonVertexFitterBase::cov_

mutableprotected

covariance matrix (3x3)

Definition at line 38 of file CandCommonVertexFitter.h.

double CandCommonVertexFitterBase::ndof_

mutableprotected

number of degrees of freedom

Definition at line 36 of file CandCommonVertexFitter.h.