JetPartonTruthLabel.cxx

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/*
  Copyright (C) 2002-2023 CERN for the benefit of the ATLAS collaboration
*/
 
#include "ParticleJetTools/JetPartonTruthLabel.h"
#include "xAODTruth/TruthParticle.h"
#include "TruthUtils/HepMCHelpers.h"
 
using namespace std;
using namespace Analysis;
 
int JetPartonTruthLabel::modifyJet(xAOD::Jet &jet) const {
  ATH_MSG_VERBOSE("In " << name() << "::modifyJet()");
 
    int label = -1;
    double e_max = 0;
    double pt_max = 0;
    double dr_max = 0;
 
    vector<const xAOD::TruthParticle*> partons;
    bool success = jet.getAssociatedObjects("GhostPartons", partons);
    if(success) {
        for(auto it = partons.begin(); it != partons.end(); it++) {
                  if(MC::isTop(*it)) continue; // Skip top
 
            if((*it)->e() > e_max) {
                label = (*it)->absPdgId();
                e_max = (*it)->e();
                pt_max = (*it)->pt();
                dr_max = (*it)->p4().DeltaR(jet.p4());
            }
        }
    }
 
  jet.setAttribute("PartonTruthLabelID", label);
  jet.setAttribute("PartonTruthLabelPt", pt_max);
  jet.setAttribute("PartonTruthLabelEnergy", e_max);
  jet.setAttribute("PartonTruthLabelDR", dr_max);
 
  return 0;
}