EtaJESCorrection.h

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/*
  Copyright (C) 2002-2024 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef JETCALIBTOOLS_ETAJESCORRECTION_H
#define JETCALIBTOOLS_ETAJESCORRECTION_H 1
 
/* Implementation of EtaJESCorrection class
 * This class will apply the absolute EtaJES correction
 *
 * Author: Joe Taenzer (joseph.taenzer@cern.ch)
 * Date: August 19 2013
 */
 
#include "TH1.h"
#include "TString.h"
#include <string>
#include <vector>
#include <memory>
class TEnv;
class TAxis;
 
 
#include "JetCalibTools/JetCalibrationStep.h"
 
class EtaJESCorrection 
  : virtual public ::JetCalibrationStep
{
 
 public:
  EtaJESCorrection();
  EtaJESCorrection(const std::string& name, TEnv * config, TString jetAlgo, TString calibAreaTag, bool mass, bool dev);
  virtual ~EtaJESCorrection();
 
  virtual StatusCode initialize() override;
  virtual StatusCode calibrate(xAOD::Jet& jet, JetEventInfo&) const override;
 
 private:
  double getJES(double E_uncorr, double eta_det) const;
  double getLowPtJES(double E_uncorr, double eta_det) const;
  double getEtaCorr(double E_corr, double eta_det) const;
  double getMassCorr(double E_corr, double eta_det) const;
  double getLogPolN(const double *factors, double x) const;
  double getLogPolNSlope(const double *factors, double x) const;
  double getSplineCorr(const int etaBin, double E) const;
  double getSplineSlope(const int ieta, const double minE) const;
  void loadSplineHists(const TString & fileName, const std::string &etajes_name = "etaJes");
 
  int getEtaBin(double eta_det) const;
 
 private:
  TEnv * m_config{};
  TString m_jetAlgo;
  TString m_calibAreaTag;
  bool m_mass{};
  bool m_dev{};
  bool m_freezeJESatHighE{};
  bool m_isSpline{};
 
  TString m_jesDesc;
  double m_minPt_JES{}, m_minPt_EtaCorr{}, m_maxE_EtaCorr{};
  unsigned int m_lowPtExtrap{};
  double m_lowPtMinR{};
  bool m_applyMassCorrection{};
  bool m_useSecondaryminPt_JES{};
  double m_etaSecondaryminPt_JES{};
  double m_secondaryminPt_JES{};
 
  TAxis * m_etaBinAxis{};
 
  // 90 eta bins, and up to 9 parameter for the pol-fit
  const static unsigned int s_nEtaBins=90;
  const static unsigned int s_nParMin=7;
  const static unsigned int s_nParMax=9;
  unsigned int m_nPar{}; // number of parameters in config file
  double m_JESFactors[s_nEtaBins][s_nParMax]={};
  double m_JES_MinPt_Slopes[s_nEtaBins]={};
  double m_JES_MinPt_E[s_nEtaBins]={};
  double m_JES_MinPt_R[s_nEtaBins]={};
  double m_JES_MinPt_Param1[s_nEtaBins]={};
  double m_JES_MinPt_Param2[s_nEtaBins]{};
  double m_etaCorrFactors[s_nEtaBins][s_nParMax]={};
  double m_JMSFactors[s_nEtaBins][s_nParMax]={};
  double m_energyFreezeJES[s_nEtaBins]={};
 
  // When using p-splines, the calibrations are stored as a finely binned TH1 for simplicity.
  // This avoids importing new packages into Athena.
  std::vector<std::unique_ptr<TH1> > m_etajesFactors;
 
 
};
 
#endif