PFEnergyResolution Class Reference

#include <PFEnergyResolution.h>

Public Member Functions
double	getEnergyResolutionEm (double CorrectedEnergy, double eta) const
double	getEnergyResolutionHad (double energyHCAL, double eta, double phi) const
	PFEnergyResolution ()
	~PFEnergyResolution ()

Detailed Description

Definition at line 30 of file PFEnergyResolution.h.

Constructor & Destructor Documentation

PFEnergyResolution::PFEnergyResolution

(

)

Definition at line 10 of file PFEnergyResolution.cc.

{
//--- nothing to be done yet
}

PFEnergyResolution::~PFEnergyResolution

(

)

Definition at line 15 of file PFEnergyResolution.cc.

{
//--- nothing to be done yet  
}

Member Function Documentation

double PFEnergyResolution::getEnergyResolutionEm	(	double	CorrectedEnergy,
		double	eta
	)		const

Definition at line 21 of file PFEnergyResolution.cc.

References Abs(), funct::C, N, query::result, and S().

Referenced by PFElectronAlgo::SetCandidates().

                                                                                        {

  //The parameters S,N,C has been determined with the Full Sim on CMSSW_2_1_0_pre4. 
  //The resolution must be a function of the corrected energy available in PFEnergyCalibration
  //Jonathan Biteau July 2008

  double C;
  double S;
  double N;
  if(TMath::Abs(eta)<1.48){C=0.35/100; S=5.51/100; N=98./1000.;}
  else{C=0; S=12.8/100; N=440./1000.;} 
  double result = TMath::Sqrt(C*C*CorrectedEnergy*CorrectedEnergy + S*S*CorrectedEnergy + N*N);
  return result; 
}

double PFEnergyResolution::getEnergyResolutionHad	(	double	energyHCAL,
		double	eta,
		double	phi
	)		const

Definition at line 37 of file PFEnergyResolution.cc.

References mathSSE::sqrt().

{
//--- estimate **relative** resolution of energy measurement (sigmaE/E)
//    for hadrons in depositing energy in HCAL
//    (eta and phi dependence not implemented yet)

  return 1.49356/sqrt(energyHCAL) + 6.62527e-03*sqrt(energyHCAL) - 6.33966e-02;
}