ZDCTriggerEfficiency.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "ZdcAnalysis/ZDCTriggerEfficiency.h"
#include "AsgTools/MessageCheckAsgTools.h"
#include <cmath>
 
double ZDCTriggerEfficiency::GetEfficiency(int side, float ADCSum){
  double alpha = m_currentParams[side][0];
  double  beta = m_currentParams[side][1];
  double  theta = m_currentParams[side][2];
  if(alpha<10e-5||beta<10e-5||theta<10e-5)
    {
      return -1;
    }
  double m = std::exp(-ADCSum/theta);
  double p = std::exp(-(ADCSum - alpha) / beta);
  double efficiency = (1 - m) / (1 + p);
  return efficiency;
}
 
std::pair<double, double> ZDCTriggerEfficiency::GetEfficiencyAndError(MsgStream& msg, int side, float ADCSum){
  double alpha = m_currentParams[side][0];
  double  beta = m_currentParams[side][1];
  double  theta = m_currentParams[side][2];
  if(alpha<10e-5||beta<10e-5||theta<10e-5)
    {
      return std::make_pair(-1,-1);
    }
  
  double alphaErr = m_currentParamErrors[side][0];
  double betaErr = m_currentParamErrors[side][1];
  double thetaErr = m_currentParamErrors[side][2];
  
  double corrAlphaBeta = m_currentCorrCoefff[side][0];
  double corrAlphaTheta = m_currentCorrCoefff[side][1];
  double corrBetaTheta = m_currentCorrCoefff[side][2];
  
  double m = std::exp(-ADCSum/theta);
  double p = std::exp(-(ADCSum - alpha) / beta);
  double efficiency = (1 - m) / (1 + p);
  double dda = (1 - m) * -p / beta / (1 + p) / (1 + p);
  double ddb = (1 - m) * -p / std::pow(1 + p, 2.0) * ADCSum / beta / beta;
  double ddt = -ADCSum * m / theta / theta / (1 + p);
  
  double efficiencyErr = std::sqrt(
                   std::pow(alphaErr * dda, 2) +
                   std::pow(betaErr * ddb, 2) +
                   std::pow(thetaErr * ddt, 2) +
                   2 * corrAlphaBeta*alphaErr*betaErr * dda * ddb +
                   2 * corrAlphaTheta*alphaErr*thetaErr * dda * ddt +
                   2 * corrBetaTheta*betaErr*thetaErr * ddb * ddt);
  
  if (efficiencyErr<0)
    {
      efficiencyErr = 0;
      msg << MSG::INFO << "Efficiency Uncertainty calculation abnormal." << endmsg;
    }
  
  return std::make_pair(efficiency, efficiencyErr);
}