Atlfast::KinematicHelper Class Reference

#include <KinematicHelper.h>

List of all members.

Public Member Functions
double	deltaR (IKinematic &a, IKinematic &b)
double	deltaR (IKinematic *a, IKinematic *b)
double	deltaPhi (IKinematic &a, IKinematic &b)
double	deltaPhi (IKinematic *a, IKinematic *b)
double	mass (IKinematic &a, IKinematic &b)
double	mass (IKinematic *a, IKinematic *b)
template<class Iter>
double	mass (Iter begin, Iter end)
template<class Iter>
double	sumETInCone (Iter begin, Iter end, IKinematic *reference, double rCone)
template<class Iter>
double	sumETInHalo (Iter begin, Iter end, IKinematic *reference, double rLower, double rHigher)
template<class Iter>
HepLorentzVector	sumMomentumInHalo (Iter begin, Iter end, IKinematic *reference, double rLower, double rHigher)

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Detailed Description

Provides implementation of useful manipulations of entities honouring the IKinematic interface.

Definition at line 32 of file KinematicHelper.h.

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Member Function Documentation

double Atlfast::KinematicHelper::deltaR	(	IKinematic &	a,
		IKinematic &	b
	)

Return the distance in eta-phi space between two items

Definition at line 35 of file KinematicHelper.cxx.

{ 
  return this->deltaR( &a, &b ) ;
}

double Atlfast::KinematicHelper::deltaR	(	IKinematic *	a,
		IKinematic *	b
	)

Return the distance in eta-phi space between two items

Definition at line 18 of file KinematicHelper.cxx.

{ 
  //IKinematic* a = this->regulateType( aa ) ;
  //IKinematic* b = this->regulateType( bb ) ;

  // Doing this takes care of cyclic algebra
  Phi aphi(a->phi()) ;
  Phi bphi(b->phi()) ; 

  double dist = 
    sqrt(
         (aphi - bphi)*(aphi - bphi) +
         (a->eta() - b->eta())*(a->eta() - b->eta()) 
         );
  return dist ;
}

double Atlfast::KinematicHelper::deltaPhi	(	IKinematic &	a,
		IKinematic &	b
	)

Return the distance in phi space between two items

Definition at line 47 of file KinematicHelper.cxx.

{ 
  return this->deltaPhi( &a, &b ) ;
}

double Atlfast::KinematicHelper::deltaPhi	(	IKinematic *	a,
		IKinematic *	b
	)

Return the distance in phi space between two items

Definition at line 42 of file KinematicHelper.cxx.

{ 
  return std::abs( Phi( a->phi() - b->phi() ) ) ;
}

double Atlfast::KinematicHelper::mass	(	IKinematic &	a,
		IKinematic &	b
	)

Return the invariant mass of two items,

Definition at line 59 of file KinematicHelper.cxx.

{ 
  return this->mass( &a, &b ) ;
}

double Atlfast::KinematicHelper::mass	(	IKinematic *	a,
		IKinematic *	b
	)

Return the invariant mass of two items,

Definition at line 54 of file KinematicHelper.cxx.

{ 
  return ( a->momentum() + b->momentum() ).m() ;
}

template<class Iter>

double Atlfast::KinematicHelper::mass	(	Iter	begin,
		Iter	end
	)			[inline]

Return the invariant mass of a collection of IKinematic* (not IKinematic& at present)

Definition at line 76 of file KinematicHelper.h.

    {
      HepLorentzVector temp(0.,0.,0.,0.) ;
      for( Iter i = begin; i < end; ++i )
        {
          temp += (*i)->momentum() ;
        }
      return temp.m() ;
    }

template<class Iter>

double Atlfast::KinematicHelper::sumETInCone	(	Iter	begin,
		Iter	end,
		IKinematic *	reference,
		double	rCone
	)			[inline]

Sum quantities in a given R-cone from a reference.

Definition at line 92 of file KinematicHelper.h.

{  
  double result = 0.0;     
  for( Iter itr = begin; itr < end; ++itr )
    {       
      if( this->deltaR( reference, *itr ) < rCone ) 
        { 
          result += (*itr)->eT() ; 
        }
    }  
  return result ;
}

template<class Iter>

double Atlfast::KinematicHelper::sumETInHalo	(	Iter	begin,
		Iter	end,
		IKinematic *	reference,
		double	rLower,
		double	rHigher
	)			[inline]

Sum scalar ET in a given R-interval from a reference.

Definition at line 114 of file KinematicHelper.h.

    {
      double result = 0.0;
      for( Iter itr = begin; itr < end; ++itr )
        {
          if( this->deltaR( reference, *itr ) > rLower 
              && this->deltaR( reference, *itr ) < rHigher
              )
            {
              result += (*itr)->eT() ;
            }
        }
      return result ;
    }  

template<class Iter>

HepLorentzVector Atlfast::KinematicHelper::sumMomentumInHalo	(	Iter	begin,
		Iter	end,
		IKinematic *	reference,
		double	rLower,
		double	rHigher
	)			[inline]

Sum scalar ET in a given R-interval from a reference.

Definition at line 139 of file KinematicHelper.h.

    {
      HepLorentzVector result(0.,0.,0.,0.);
      for( Iter itr = begin; itr < end; ++itr )
        {
          if( this->deltaR( reference, *itr ) > rLower
              && this->deltaR( reference, *itr ) < rHigher
              )
            {
              result += (*itr)->momentum() ;
            }
        }
      return result ;
    }

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

• /afs/cern.ch/user/s/sdean/project_builds/AtlasOffline-rel_1/Simulation/Atlfast/AtlfastUtils/AtlfastUtils/KinematicHelper.h
• /afs/cern.ch/user/s/sdean/project_builds/AtlasOffline-rel_1/Simulation/Atlfast/AtlfastUtils/src/KinematicHelper.cxx

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