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 14 of file PFEnergyResolution.cc.

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

Member Function Documentation

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

Definition at line 18 of file PFEnergyResolution.cc.

References Abs(), gen::C, N, mps_fire::result, and S().

Referenced by metsig::SignAlgoResolutions::ElectronPtResolution().

                                                                                         {
  //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 39 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;
}