TruthMuonTrackRetriever.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "TruthMuonTrackRetriever.h"
 
#include "GaudiKernel/IPartPropSvc.h"
 
#include "AtlasHepMC/GenParticle.h"
#include "TrackRecord/TrackRecord.h"
#include "TrackRecord/TrackRecordCollection.h"
#include "HepPDT/ParticleData.hh"
#include "HepPDT/ParticleDataTable.hh"
#include "CLHEP/Geometry/Point3D.h"
#include "CLHEP/Geometry/Vector3D.h"
#include "CLHEP/Units/SystemOfUnits.h"
#include "TruthUtils/MagicNumbers.h"
 
 
namespace JiveXML {

   TruthMuonTrackRetriever::TruthMuonTrackRetriever(const std::string& type ,const std::string& name,const IInterface* parent):
     base_class(type, name, parent),
     m_typeName("SMTr") {
     //Fill the list with the names of track record collections to try
     m_TrackRecCollNames.push_back("MuonEntryLayer");
     m_TrackRecCollNames.push_back("MuonEntryRecord");
 
     //Declare the properties
     declareProperty("TrackRecCollNames",m_TrackRecCollNames,"List of track records collections to try in this order - only one is retrieved");
 
   }
 

  StatusCode TruthMuonTrackRetriever::initialize(){
    
    //Nothing to be done here
    return StatusCode::SUCCESS;
  }
  
  StatusCode TruthMuonTrackRetriever::retrieve(ToolHandle<IFormatTool> &FormatTool) {
 
    ATH_MSG_DEBUG( "Retrieving " << dataTypeName() ); 
 
    //Try to retrieve the track record collection
    const TrackRecordCollection* TrackRecordColl = NULL ;
    //Loop over all the collections and try a retrieve (more efficenct than
    //contain-retrieve combination)
    for (const auto & CollNameItr : m_TrackRecCollNames ) {
      //be verbose
      ATH_MSG_DEBUG( "Trying to retrieve " << CollNameItr );
      //try to retrieve
      if ( !evtStore()->contains<TrackRecordCollection>( CollNameItr )){ continue; } // skip if not in SG
      if (evtStore()->retrieve(TrackRecordColl, CollNameItr).isSuccess()) break ;
    }
 
    //If we didnt' get any, return
    if (TrackRecordColl == NULL ) {
      ATH_MSG_WARNING( "Unable to retrieve any track collection from " << m_TrackRecCollNames );
      return StatusCode::RECOVERABLE;
    }
 
    //Reserve space for the output
    DataVect pt; pt.reserve(TrackRecordColl->size());
    DataVect phi; phi.reserve(TrackRecordColl->size());
    DataVect eta; eta.reserve(TrackRecordColl->size());
    DataVect rhoVertex; rhoVertex.reserve(TrackRecordColl->size());
    DataVect phiVertex; phiVertex.reserve(TrackRecordColl->size());
    DataVect zVertex; zVertex.reserve(TrackRecordColl->size());
    DataVect code; code.reserve(TrackRecordColl->size());
    DataVect id; id.reserve(TrackRecordColl->size()); 
 
    //Now loop over the collection and retrieve data
    for (const auto & record : *TrackRecordColl ) {
 
      //Get the pdg code
      int pdgCode = record.GetPDGCode();
 
      //Only accept muons
      if (abs(pdgCode) != 13) {
        ATH_MSG_DEBUG( "Reject non-muon track with PDG ID " << pdgCode );
        continue;
      }
 
      //Get vertex and momentum
      HepGeom::Point3D<double> vertex = record.GetPosition();
      HepGeom::Vector3D<double> momentum = record.GetMomentum();
 
      //And store output
      pt.emplace_back( momentum.perp()/CLHEP::GeV );
      phi.emplace_back( momentum.phi() < 0 ? momentum.phi() + 2*M_PI : momentum.phi() );
      eta.emplace_back( momentum.pseudoRapidity() );
      rhoVertex.emplace_back( vertex.perp()*CLHEP::mm/CLHEP::cm );
      phiVertex.emplace_back( vertex.phi() < 0 ? vertex.phi() + 2*M_PI : vertex.phi() );
      zVertex.emplace_back( vertex.z()*CLHEP::mm/CLHEP::cm );
      code.emplace_back( pdgCode );
      id.emplace_back( HepMC::barcode(record) ); // FIXME barcode-based
    }
    
    //Finall add everything to the datamap
    DataMap dataMap;
    const auto nEntries = pt.size();
    dataMap["pt"] = std::move(pt);
    dataMap["phi"] = std::move(phi);
    dataMap["eta"] = std::move(eta);
    dataMap["rhoVertex"] = std::move(rhoVertex);
    dataMap["phiVertex"] = std::move(phiVertex);
    dataMap["zVertex"] = std::move(zVertex);
    dataMap["code"] = std::move(code);
    dataMap["id"] = std::move(id);
    
    //some summary
    ATH_MSG_DEBUG( dataTypeName() << ": "<< nEntries );
 
    //forward data to formating tool
    //return FormatTool->AddToEvent(dataTypeName(), (*CollNameItr), &dataMap);
    std::string emptyStr="";
    return FormatTool->AddToEvent(dataTypeName(), emptyStr, &dataMap);
  }
}