NewVrtSecInclusiveAlg.cxx

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/*
   Copyright (C) 2002-2022 CERN for the benefit of the ATLAS collaboration
 */
 
 // NewVrtSecInclusiveAlg.cxx, (c) ATLAS Detector software
 // Author: Vadim Kostyukhin (vadim.kostyukhin@cern.ch)
#include "xAODEventInfo/EventInfo.h"
#include "NewVrtSecInclusiveTool/NewVrtSecInclusiveAlg.h"
#include "xAODTracking/VertexAuxContainer.h"
#include "GeoPrimitives/GeoPrimitivesHelpers.h"
 
#include "TLorentzVector.h"
#include "CxxUtils/sincos.h"
 
namespace Rec {
 
   static const SG::AuxElement::Decorator<float> bvrtM("bvrtM");  
   static const SG::AuxElement::Decorator<float> bvrtPt("bvrtPt");  
   static const SG::AuxElement::Decorator<float> bvrtPhi("bvrtPhi");  
   static const SG::AuxElement::Decorator<float> bvrtEta("bvrtEta");  
   static const SG::AuxElement::Decorator<float> mindRjetP("mindRjetP");
   static const SG::AuxElement::Decorator<float> mindRjetV("mindRjetV");
   static const SG::AuxElement::Decorator<float> mindRBTagSV("mindRBTagSV");
 
   NewVrtSecInclusiveAlg::NewVrtSecInclusiveAlg(const std::string& name, ISvcLocator* pSvcLocator) :
     AthReentrantAlgorithm( name, pSvcLocator ),
     m_bvertextool("Rec::NewVrtSecInclusiveTool/SVTool",this)
   {
     declareProperty("BVertexTool",m_bvertextool);
   }
 
   StatusCode NewVrtSecInclusiveAlg::initialize()
   {
     ATH_CHECK( m_tpContainerKey.initialize() );
     ATH_CHECK( m_pvContainerKey.initialize() );
     ATH_CHECK( m_jetContainerKey.initialize() );
     ATH_CHECK( m_btsvContainerKey.initialize() );
     ATH_CHECK( m_foundVerticesKey.initialize() );
     ATH_CHECK( m_bvertextool.retrieve() );
     return StatusCode::SUCCESS;
   }
 
   StatusCode NewVrtSecInclusiveAlg::finalize()
   {
     return StatusCode::SUCCESS;
   }
 
   StatusCode NewVrtSecInclusiveAlg::execute(const EventContext &ctx) const
   {
 
     const xAOD::Vertex* pv = nullptr;
     std::vector<const xAOD::TrackParticle*> trkparticles(0);
 
     //-- Extract TrackParticles
     SG::ReadHandle<xAOD::TrackParticleContainer> tp_cont(m_tpContainerKey, ctx);
     if ( !tp_cont.isValid() ) {
        ATH_MSG_WARNING( "No TrackParticle container found in TES" );
     }else{
        for(const auto *tp : (*tp_cont)) trkparticles.push_back(tp);
     }
 
     //-- Extract Primary Vertex
     SG::ReadHandle<xAOD::VertexContainer> pv_cont(m_pvContainerKey, ctx);
     if ( !pv_cont.isValid() ) {
       ATH_MSG_WARNING( "No Primary Vertices container found in TDS" );
     }else{
       //-- Extract PV itself
       for ( const auto *v : *pv_cont ) {
         if (v->vertexType()==xAOD::VxType::PriVtx) {    pv = v;   break; }
       }
     }
 
     //-- Extract SV from b-jets Vertices
     SG::ReadHandle<xAOD::VertexContainer> btsv_cont(m_btsvContainerKey, ctx);
     if ( !btsv_cont.isValid() ) {
       ATH_MSG_WARNING( "No BTagging Vertices container found in TDS" );
     }
 
     //-- Extract Jets
     SG::ReadHandle<xAOD::JetContainer> jet_cont(m_jetContainerKey, ctx);
     if ( !jet_cont.isValid() ) {
        ATH_MSG_WARNING( "No AntiKt4EMPFlowJet container found in TES" );
     }
 
     //-- create container for new vertices
     auto bVertexContainer    = std::make_unique<xAOD::VertexContainer>();
     auto bVertexAuxContainer = std::make_unique<xAOD::VertexAuxContainer>();
     bVertexContainer->setStore(bVertexAuxContainer.get());
 
     if( pv &&  trkparticles.size()>2 ){
       std::unique_ptr<Trk::VxSecVertexInfo> foundVrts = m_bvertextool->findAllVertices(trkparticles,*pv);      
       if(foundVrts && !foundVrts->vertices().empty()){
         const std::vector<xAOD::Vertex*> vtmp=foundVrts->vertices();
         double mindRSVPV=1.e3;  // Check coincidence with existing SV1 vertex
         for(const auto & iv :  vtmp) {
           if( btsv_cont.isValid() ){
             for ( const auto *btsv : *btsv_cont ) mindRSVPV=std::min(Amg::deltaR(btsv->position()-pv->position(),iv->position()-pv->position()),mindRSVPV);
           }
           bVertexContainer->push_back(iv);
           std::vector< Trk::VxTrackAtVertex > & vtrk = iv->vxTrackAtVertex();
           TLorentzVector VSUM(0.,0.,0.,0.);
           TLorentzVector tmp;
           for(auto & it : vtrk){
              const Trk::Perigee* mPer = dynamic_cast<const Trk::Perigee*>(it.perigeeAtVertex());
              CxxUtils::sincos   phi(mPer->parameters()[Trk::phi]);
              CxxUtils::sincos theta(mPer->parameters()[Trk::theta]);
              double absP  =  1./std::abs(mPer->parameters()[Trk::qOverP]);
              tmp.SetXYZM( phi.cs*theta.sn*absP, phi.sn*theta.sn*absP, theta.cs*absP, Trk::ParticleMasses::mass[Trk::pion]);
              VSUM+=tmp;
           }
           bvrtM(*iv)  =VSUM.M();
           bvrtPt(*iv) =VSUM.Pt();
           bvrtEta(*iv)=VSUM.Eta();
           bvrtPhi(*iv)=VSUM.Phi();
           TVector3 SVmPV(iv->x()-pv->x(),iv->y()-pv->y(),iv->z()-pv->z());
           double mindRMOM=1.e3, mindRSV=1.e3;
           if( jet_cont.isValid() ){
             for(const auto *jet : (*jet_cont)) {
               mindRMOM=std::min(VSUM.DeltaR(jet->p4()),mindRMOM);
               mindRSV =std::min(SVmPV.DeltaR(jet->p4().Vect()),mindRSV);
             }
           }
           mindRBTagSV(*iv) =mindRSVPV;
           mindRjetP(*iv)   =mindRMOM;
           mindRjetV(*iv)   =mindRSV;
         }
       }
     }
     ATH_MSG_DEBUG("Found Vertices in this event: " << bVertexContainer->size());
 
     SG::WriteHandle<xAOD::VertexContainer>  vrtInThisEvent(m_foundVerticesKey,ctx);
     ATH_CHECK( vrtInThisEvent.record (std::move(bVertexContainer),
                                       std::move(bVertexAuxContainer)) );
     return StatusCode::SUCCESS;
   }
}