TrkToLeptonPVTool.cxx

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
/*
   Tool to match a track to a Primary Vertex obtained with other leptons/tracks
 
    Author: Vadim Kostyukhin
    e-mail: vadim.kostyukhin@cern.ch
*/
#include "TrkToLeptonPVTool/TrkToLeptonPVTool.h"
 
#include "TrkVKalVrtFitter/TrkVKalVrtFitter.h"
#include "AthContainers/AuxStoreInternal.h"
#include "AthContainers/ConstAccessor.h"
#include "GaudiKernel/EventContext.h"
//
//Constructor-------------------------------------------------------------- 
TrkToLeptonPVTool::TrkToLeptonPVTool(const std::string& type,
                                           const std::string& name,
                                           const IInterface* parent):
  AthAlgTool(type,name,parent)
  {
     declareInterface<ITrkToLeptonPV>(this);
  }
 
//Destructor---------------------------------------------------------------
  TrkToLeptonPVTool::~TrkToLeptonPVTool(){
    ATH_MSG_DEBUG("TrkToLeptonPVTool destructor called");
  }
 
//Initialize---------------------------------------------------------------
   StatusCode TrkToLeptonPVTool::initialize(){
     //-----
     if (m_fitterSvc.retrieve().isFailure()) {
        ATH_MSG_DEBUG("Can't find Trk::TrkVKalVrtFitter");
        return StatusCode::FAILURE;
     } else {
        ATH_MSG_DEBUG("TrkToLeptonPVTool TrkVKalVrtFitter found");
     }
     //-----
     ATH_CHECK(m_beamSpotKey.initialize());
     //-----
     return StatusCode::SUCCESS;
   }
 
   StatusCode TrkToLeptonPVTool::finalize()
   {
    ATH_MSG_DEBUG(" finalize()");
    return StatusCode::SUCCESS; 
   }
 
 
   std::unique_ptr<xAOD::Vertex>  TrkToLeptonPVTool::matchTrkToPV( const EventContext& ctx, const xAOD::TrackParticle *trk, const xAOD::Vertex * PV,
                                                                   const xAOD::EventInfo * eventINFO) const
   {
     static const SG::ConstAccessor<float> vyAcc("vy");
     if(vyAcc.isAvailable(*trk)) {
       std::vector<const xAOD::TrackParticle *> tpv(1,trk);
       return m_fitterSvc->fit(ctx,tpv,(*PV));
     }
 
     //---DAOD case     
     if( !eventINFO ) return {nullptr};
     std::unique_ptr< SG::AuxStoreInternal > pAux;
     xAOD::TrackParticleContainer   TPC;
     std::vector<const xAOD::TrackParticle*>     wrkTrkC(1);
     pAux = std::make_unique< SG::AuxStoreInternal >();
     TPC.setStore( pAux.get() );
     TPC.reserve( 1 );
     TPC.push_back(new (std::nothrow) xAOD::TrackParticle(*trk));
     if(!TPC[0])return {nullptr};
 
     const float mvx= (eventINFO) ? eventINFO->beamPosX() : 0.;
     const float mvy= (eventINFO) ? eventINFO->beamPosY() : 0.;
     static const SG::ConstAccessor<float> vzAcc("vz");
     const float mvz= (vzAcc.isAvailable(*trk)) ? trk->vz() : 0.;
     TPC[0]->setParametersOrigin( mvx, mvy, mvz);
     wrkTrkC[0]=TPC[0];
     return m_fitterSvc->fit(ctx,wrkTrkC,(*PV));
 
   }
 
 
   std::unique_ptr<xAOD::Vertex>TrkToLeptonPVTool::npartVertex( const EventContext& ctx,
                                                                const std::vector<const xAOD::TrackParticle*> & particles,
                                                                const xAOD::EventInfo * eventINFO) const
   {
     if(particles.empty()) return {nullptr};
 
     std::vector<const xAOD::TrackParticle*> tmpp(particles);
     std::sort(tmpp.begin(),tmpp.end());
     auto tst=std::unique(tmpp.begin(),tmpp.end());
     if( tst !=  tmpp.end()) {
       ATH_MSG_DEBUG(" Duplicated particles on input!");
       return {nullptr};
     }
 
     static const SG::ConstAccessor<float> vyAcc("vy");
     bool fullxAOD=false;   if(vyAcc.isAvailable(*particles[0])) fullxAOD=true;
 
     xAOD::Vertex BEAM; 
     BEAM.makePrivateStore();
     BEAM.setX(0.); BEAM.setY(0.); BEAM.setZ(0.);
     std::vector<float> defaultCovar {0.015f*0.015f,0.f,0.015f*0.015f,0.f,0.f,1.e6};
     BEAM.setCovariance(defaultCovar);
     float beamtiltX=0.;
     float beamtiltY=0.;
     AmgSymMatrix(3) beamcov;
     beamcov.setIdentity();
     //-------------------------------
     if(eventINFO){
          BEAM.setX(eventINFO->beamPosX());
          BEAM.setY(eventINFO->beamPosY());
          BEAM.setZ(eventINFO->beamPosZ());
          beamcov(0,0) = eventINFO->beamPosSigmaX() * eventINFO->beamPosSigmaX();
          beamcov(1,0) = beamcov(0,1) = eventINFO->beamPosSigmaXY();
          beamcov(1,1) = eventINFO->beamPosSigmaY() * eventINFO->beamPosSigmaY();
          beamcov(2,2) = eventINFO->beamPosSigmaZ() * eventINFO->beamPosSigmaZ()*1.e6;  //Remove any constraint in Z direction
          BEAM.setCovariancePosition(beamcov);
          beamtiltX= eventINFO->beamTiltXZ();
          beamtiltY= eventINFO->beamTiltYZ();
     }
     SG::ReadCondHandle<InDet::BeamSpotData> beamSpotHandle { m_beamSpotKey, ctx };
     
     if(beamSpotHandle.isValid() && fullxAOD ){
          ATH_MSG_DEBUG("Beam service is present");
          BEAM.setPosition(beamSpotHandle->beamVtx().position());
          beamcov  = beamSpotHandle->beamVtx().covariancePosition();
          beamcov(2,2) *= 1.e6;  //Remove any constraint in Z direction
          BEAM.setCovariancePosition(beamcov);
          beamtiltX= beamSpotHandle->beamTilt(0);
          beamtiltY= beamSpotHandle->beamTilt(1);
     }         
     if(fullxAOD){ ATH_MSG_DEBUG("xAOD data"); }
     else        { ATH_MSG_DEBUG("DxAOD data");}
     ATH_MSG_DEBUG("BEAM  x,y,z="<<BEAM.x()<<","<<BEAM.y()<<","<<BEAM.z());
     ATH_MSG_DEBUG("BEAM covariance="<<BEAM.covariance()[0]<<","<<BEAM.covariance()[1]<<","<<BEAM.covariance()[2]
                                <<","<<BEAM.covariance()[3]<<","<<BEAM.covariance()[4]<<","<<BEAM.covariance()[5]);
     ATH_MSG_DEBUG("BEAM  tiltX,Y="<<beamtiltX<<","<<beamtiltY);
 
     if(fullxAOD){
       //---If beam is tilted -> make pre-fit and translate beam constraint to pre-fitted position
       if( beamtiltX!=0. || beamtiltY!=0.) { 
          std::unique_ptr<xAOD::Vertex> iniVertex = m_fitterSvc->fit(ctx,particles,BEAM);
          if(!iniVertex) return {nullptr};
          BEAM.setX(BEAM.x()+beamtiltX*iniVertex->z());
          BEAM.setY(BEAM.y()+beamtiltY*iniVertex->z());
       }
       return m_fitterSvc->fit(ctx,particles,BEAM);
     }
 
     //
     //---DxAOD case
     //
     int NPRT=particles.size();
     std::unique_ptr< SG::AuxStoreInternal > pAux;
     xAOD::TrackParticleContainer   TPC;
     std::vector<const xAOD::TrackParticle*>     wrkTrkC(NPRT);
     pAux = std::make_unique< SG::AuxStoreInternal >();
     TPC.setStore( pAux.get() );
     TPC.reserve( NPRT );
     static const SG::ConstAccessor<float> vzAcc("vz");
     for(int i=0; i<NPRT; i++){
    TPC.push_back(new (std::nothrow) xAOD::TrackParticle(*particles[i]));
    if(!TPC[i])return {nullptr};
    const float mvx= (eventINFO) ? eventINFO->beamPosX() : 0.;
    const float mvy= (eventINFO) ? eventINFO->beamPosY() : 0.;
    const float mvz= (vzAcc.isAvailable(*particles[i])) ? particles[i]->vz() : 0.;
    TPC[i]->setParametersOrigin( mvx, mvy, mvz);
    wrkTrkC[i]=TPC[i];
     }
 
     //---If beam is tilted -> make pre-fit and translate beam constraint to pre-fitted position
     if( beamtiltX!=0. || beamtiltY!=0.) { 
        std::unique_ptr<xAOD::Vertex> iniVertex = m_fitterSvc->fit(ctx,wrkTrkC,BEAM);
        if(!iniVertex) return {nullptr};
        BEAM.setX(BEAM.x()+beamtiltX*iniVertex->z());
        BEAM.setY(BEAM.y()+beamtiltY*iniVertex->z());
     }
     return m_fitterSvc->fit(ctx,wrkTrkC,BEAM);
   }