UserPhotonFlux.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
#include "UserPhotonFlux.h"
 
  StatusCode UserPhotonFlux::initialize() {
    ATH_MSG_INFO( "Initialisation of " << name() << " was successful" );
    return StatusCode::SUCCESS;
  }
 
  StatusCode UserPhotonFlux::InitializePythiaInfo(Pythia8::Pythia& pythia) const {
 
    ATH_MSG_INFO( "InitializePythiaInfo " << name() << " with process " << m_process);
    if (m_process == 1) {
      PDFPtr photonFlux = PNEW(Lepton2gamma2, -11);
      pythia.setPhotonFluxPtr(photonFlux, 0);
      return StatusCode::SUCCESS;
    }
    else if(m_process ==2 || m_process ==3) {    
      ATH_MSG_INFO( "InitializePythiaInfo " << name() << " using nuclear photon flux with Z = " << m_flux_Z << ", bmin = " << m_flux_min_b);
      Nucleus2gammaPtr photonFlux = PNEW(Nucleus2gamma2,-11);
      photonFlux->setZ(m_flux_Z);
      photonFlux->setMinB(m_flux_min_b);
      photonFlux->setMinX(m_flux_min_x);
      Nucleus2gammaPtr photonFlux2 = nullptr; PNEW(Nucleus2gamma2,-11);
      if(m_process==3) photonFlux2=photonFlux;
      pythia.setPhotonFluxPtr(photonFlux, photonFlux2);
      return StatusCode::SUCCESS;
    }
    else {
      ATH_MSG_ERROR("Unknown process: "<< m_process);
      return StatusCode::FAILURE;
    }
 
  }
  
  StatusCode UserPhotonFlux::finalize(){
    ATH_MSG_INFO( "Finalize" << name());
    return StatusCode::SUCCESS;
  }
  
 
StatusCode UserPhotonFlux::ModifyPythiaEvent(Pythia8::Pythia& /*pythia*/) const {
    return StatusCode::SUCCESS;
  }
 
  double UserPhotonFlux::CrossSectionScaleFactor() const {
    ATH_MSG_INFO( "CrossSectionScaleFactor" << name());
    return 1.0;
  }