DiTauChargeDecorator.cxx

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/*
  Copyright (C) 2002-2025 CERN for the benefit of the ATLAS collaboration
*/
 
#include "DerivationFrameworkTau/DiTauChargeDecorator.h"
#include "xAODTau/DiTauJetContainer.h"
#include "StoreGate/ReadHandle.h"
#include "StoreGate/WriteDecorHandle.h"
 
namespace DerivationFramework {
 
  DiTauChargeDecorator::DiTauChargeDecorator(const std::string& t, const std::string& n, const IInterface* p) :
    base_class(t,n,p)
  {
  }
 
  StatusCode DiTauChargeDecorator::initialize()
  {
    // initialize read/write handle keys
    ATH_CHECK( m_ditauContainerKey.initialize() );
    ATH_CHECK( m_chargeKey.initialize() ); 
    
    return StatusCode::SUCCESS;
  }
 
  StatusCode DiTauChargeDecorator::addBranches(const EventContext& ctx) const
  {
  
 
    // retrieve tau container
    SG::ReadHandle<xAOD::DiTauJetContainer> ditauJetsReadHandle(m_ditauContainerKey, ctx);
    if (!ditauJetsReadHandle.isValid()) {
      ATH_MSG_ERROR ("Could not retrieve DiTauJetContainer with key " << ditauJetsReadHandle.key());
      return StatusCode::FAILURE;
    }
    const xAOD::DiTauJetContainer* ditauContainer = ditauJetsReadHandle.cptr();   
 
    SG::WriteDecorHandle<xAOD::DiTauJetContainer, float> dec_charge (m_chargeKey, ctx);
 
    for (const auto ditau : *ditauContainer) {
      float ditau_charge = 0;
      for (const auto& xTrack : ditau->trackLinks()) {
        if (!xTrack.isValid())
           continue;
 
    if(ditau->nSubjets() >= 2){
           for (int i = 0; i < 2; ++i) { // loop over two leading subjets 
              TLorentzVector tlvSubjet = TLorentzVector();
              tlvSubjet.SetPtEtaPhiE(ditau->subjetPt(i), ditau->subjetEta(i),
                                     ditau->subjetPhi(i), ditau->subjetE(i));
              double dR = tlvSubjet.DeltaR((*xTrack)->p4());
              if (dR < 0.1) {
                 ditau_charge += (*xTrack)->charge();
                 break; //prevents double counting of tracks
              }
           }  // loop over subjets
        }      
     } // loop over tracks
     dec_charge(*ditau) = ditau_charge;
    }
 
    return StatusCode::SUCCESS;
  }
}