SysTruthWeightAlg.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/

 
//
// includes
//
 
// EDM include(s):
#include "xAODTruth/TruthParticleContainer.h"
 
// Local include(s):
#include <AsgAnalysisAlgorithms/SysTruthWeightAlg.h>
 
//
// method implementations
//
 
namespace CP
{
SysTruthWeightAlg::SysTruthWeightAlg(const std::string &name, ISvcLocator *pSvcLocator)
  : AnaAlgorithm(name, pSvcLocator), m_sysTruthWeightTool("PMGTools::PMGHFProductionFractionTool", this)
{
  // The truth particle container
  declareProperty("TruthParticleContainer", m_truthParticleContainer = "TruthParticles");
 
  // The production fraction rw tool
  declareProperty("sysTruthWeightTool", m_sysTruthWeightTool);
}
 
StatusCode SysTruthWeightAlg::initialize()
{
  if (m_decoration.empty())
  {
      ANA_MSG_ERROR("no decoration name set");
      return StatusCode::FAILURE;
  }
 
  ANA_CHECK(m_sysTruthWeightTool.retrieve());
  ANA_CHECK(m_eventInfoHandle.initialize(m_systematicsList, SG::AllowEmpty));
  ANA_CHECK(m_decoration.initialize(m_systematicsList, m_eventInfoHandle, SG::AllowEmpty));
  ANA_CHECK(m_systematicsList.addSystematics(*m_sysTruthWeightTool));
  ANA_CHECK(m_systematicsList.initialize());
 
  return StatusCode::SUCCESS;
}
 
StatusCode SysTruthWeightAlg::execute(const EventContext& ctx)
{
 
  // Retreive the truth particles container
  const xAOD::TruthParticleContainer *truthParticles = nullptr;
  ANA_CHECK(evtStore()->retrieve(truthParticles, m_truthParticleContainer));
 
  for (const auto &sys : m_systematicsList.systematicsVector())
  {
    const xAOD::EventInfo *eventInfo = nullptr;
    ANA_CHECK(m_eventInfoHandle.retrieve(eventInfo, sys, ctx));
 
    m_decoration.set(*eventInfo, m_sysTruthWeightTool->getSysWeight(truthParticles, sys), sys);
  }
 
  // return
  return StatusCode::SUCCESS;
}
} // namespace CP