PVClusterComparer Class Reference

#include <PVClusterComparer.h>

Public Member Functions
bool	operator() (const PVCluster &v1, const PVCluster &v2) const
	Use this operator in a std::sort to sort them in decreasing sumPt. More...
bool	operator() (const reco::Vertex &v1, const reco::Vertex &v2) const
double	pTSquaredSum (const PVCluster &v) const
	Calculate sum of square of the pT's of the tracks in the vertex. More...
double	pTSquaredSum (const reco::Vertex &v) const
	PVClusterComparer ()
	Constructor does nothing, no data members. More...

Detailed Description

RecoPixelVertexing/PixelVertexFinding/PVClusterComparer.h This helper class is used to sort the collection of vertexes by sumPt. It is used in DivisiveVertexFinder. The sum of the squares of the pT is only done for tracks with pT>2.5 GeV. If the pT>10 GeV, then the max value of 10 is used. (The pT of pixel tracks is not very precise.)

Date:

2006/06/06 22:28:25

Revision:

1.1

Author

Aaron Dominguez (UNL)

Definition at line 18 of file PVClusterComparer.h.

Constructor & Destructor Documentation

PVClusterComparer::PVClusterComparer

(

)

Constructor does nothing, no data members.

Definition at line 5 of file PVClusterComparer.cc.

{}

Member Function Documentation

bool PVClusterComparer::operator()	(	const PVCluster &	v1,
		const PVCluster &	v2
	)		const

Use this operator in a std::sort to sort them in decreasing sumPt.

Definition at line 30 of file PVClusterComparer.cc.

References pTSquaredSum().

                                                                                  {
  return ( pTSquaredSum(v1) > pTSquaredSum(v2) );
}

bool PVClusterComparer::operator()	(	const reco::Vertex &	v1,
		const reco::Vertex &	v2
	)		const

Definition at line 33 of file PVClusterComparer.cc.

References pTSquaredSum().

                                                                                    {
  return ( pTSquaredSum(v1) > pTSquaredSum(v2) );
}

double PVClusterComparer::pTSquaredSum

(

const PVCluster &

v

)

const

Calculate sum of square of the pT's of the tracks in the vertex.

Definition at line 7 of file PVClusterComparer.cc.

References i.

Referenced by operator()().

                                                               {
  double sum=0;
  for (unsigned int i=0; i<v.tracks().size(); ++i) {
    double pt = v.tracks()[i]->pt();
    if (pt > 2.5) { // Don't count tracks below 2.5 GeV
      if (pt > 10.0) pt = 10.0;
      sum += pt*pt;
    }
  }
  return sum;
}

double PVClusterComparer::pTSquaredSum

(

const reco::Vertex &

v

)

const

Definition at line 18 of file PVClusterComparer.cc.

References i, reco::Vertex::tracks_begin(), and reco::Vertex::tracks_end().

                                                                {
  double sum=0;
  for (reco::Vertex::trackRef_iterator i=v.tracks_begin(); i!=v.tracks_end(); ++i) {
    double pt = (*i)->pt();
    if (pt > 2.5) { // Don't count tracks below 2.5 GeV
      if (pt > 10.0) pt = 10.0;
      sum += pt*pt;
    }
  }
  return sum;
}