ParticleJetGhostLabelTool.cxx

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/*
  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
*/
 
#include "ParticleJetTools/ParticleJetGhostLabelTool.h"
#include "ParticleJetTools/ParticleJetLabelCommon.h"
#include "xAODJet/JetContainer.h"
#include "AsgMessaging/Check.h"
#include "AsgDataHandles/ReadHandle.h"
 
using namespace std;
using namespace xAOD;
 
ParticleJetGhostLabelTool::ParticleJetGhostLabelTool(const std::string& name)
        : AsgTool(name) {
    declareProperties(*this, &m_labelnames);
    declareProperty("GhostBName", m_ghostbname="GhostBHadronsFinal", "Name of attribute for matched B hadrons.");
    declareProperty("GhostCName", m_ghostcname="GhostCHadronsFinal", "Name of attribute for matched C hadrons.");
    declareProperty("GhostTauName", m_ghosttauname="GhostTausFinal", "Name of attribute for matched Taus.");
    declareProperty("PartPtMin", m_partptmin=5000, "Minimum pT of particles for labeling (MeV)");
}
 
StatusCode ParticleJetGhostLabelTool::initialize()
{
  m_labelnames.check();
  ATH_CHECK(m_truthEventsKey.initialize());
  return StatusCode::SUCCESS;
}
 
StatusCode ParticleJetGhostLabelTool::decorate(const JetContainer& jets) const
{
 
  using namespace std;
  using namespace xAOD;
  namespace pjt = ParticleJetTools;
 
  ATH_MSG_VERBOSE("In " << name() << "::modify()");
 
 
  SG::ReadHandle<xAOD::TruthEventContainer> truthEventsHandle(m_truthEventsKey);
  if (!truthEventsHandle.isValid()){
    ATH_MSG_ERROR(" Invalid ReadHandle for TruthEvents with key: " << truthEventsHandle.key());
    return StatusCode::FAILURE;
  }
 
  Amg::Vector3D origin = pjt::signalProcessP3(*truthEventsHandle);
 
  for (const xAOD::Jet* jetptr: jets) {
 
    const Jet& jet = *jetptr;
    vector<const TruthParticle*> jetlabelpartsb = match(jet, m_ghostbname);
    vector<const TruthParticle*> jetlabelpartsc = match(jet, m_ghostcname);
    vector<const TruthParticle*> jetlabelpartstau = match(jet, m_ghosttauname);
 
    // remove children whose parent hadrons are also in the jet.
    // don't care about double tau jets
    // so leave them for now.
 
    using ParticleJetTools::childrenRemoved;
    childrenRemoved(jetlabelpartsb, jetlabelpartsb);
    childrenRemoved(jetlabelpartsb, jetlabelpartsc);
    childrenRemoved(jetlabelpartsc, jetlabelpartsc);
 
    // set truth label for jets above pt threshold
    // hierarchy: b > c > tau > light
    ParticleJetTools::Particles particles {
      .b = jetlabelpartsb,
      .c = jetlabelpartsc,
      .tau = jetlabelpartstau,
      .origin = origin
    };
    ParticleJetTools::setJetLabels(jet, particles, m_labelnames);
  }
 
  return StatusCode::SUCCESS;
}
 
 
std::vector<const TruthParticle*>
ParticleJetGhostLabelTool::match(
  const xAOD::Jet& jet, const std::string& ghostname) const {
 
  ATH_MSG_VERBOSE("In " << name() << "::match()");
 
  std::vector<const xAOD::TruthParticle*> parton_links
    = jet.getAssociatedObjects<const xAOD::TruthParticle>(ghostname);
 
  std::vector<const xAOD::TruthParticle*> selected_partons;
  for (const xAOD::TruthParticle* part: parton_links) {
    if (part->pt() > m_partptmin) {
      selected_partons.push_back(part);
    }
  }
  return selected_partons;
}