VertexFittingTool.h

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/*
  Copyright (C) 2002-2026 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef LEPTONTAGGERS_VertexFittingTool_H
#define LEPTONTAGGERS_VertexFittingTool_H
 
// Local
#include "IVertexFittingTool.h"
 
// Reconstruction
#include "TrkVertexFitterInterfaces/IVertexFitter.h"
 
// Athena
#include "AthenaBaseComps/AthAlgTool.h"
#include "GaudiKernel/IInterface.h"
#include "GaudiKernel/ToolHandle.h"
#include "GaudiKernel/ServiceHandle.h"
#include "AthenaBaseComps/AthService.h"
 
// xAOD
#include "xAODTracking/TrackParticle.h"
#include "xAODTracking/Vertex.h"
 
// ROOT
#include "TStopwatch.h"
 
namespace Prompt {
    class VertexFittingTool :   public AthAlgTool,
                                virtual public IVertexFittingTool
{
    public:
        VertexFittingTool(const std::string& t, const std::string &name, const IInterface* p);
 
        virtual StatusCode initialize() override;
        virtual StatusCode finalize() override;
 
        virtual std::unique_ptr<xAOD::Vertex> fitVertexWithPrimarySeed(
            const EventContext& ctx,
            const FittingInput &input,
            const std::vector<const xAOD::TrackParticle* > &tracks,
            VtxType vtx
        ) override;
 
        virtual std::unique_ptr<xAOD::Vertex> fitVertexWithSeed(
            const EventContext& ctx,
            const FittingInput &input,
            const std::vector<const xAOD::TrackParticle* > &tracks,
            const Amg::Vector3D& seed,
            VtxType vtxType
        ) override;
 
        virtual bool isValidVertex(const xAOD::Vertex *vtx) const override;
 
    private:
 
        void removeDoubleEntries(std::vector<const xAOD::TrackParticle*> &tracks);
 
        bool decorateNewSecondaryVertex(const FittingInput &input, xAOD::Vertex *secVtx);
 
        std::unique_ptr<xAOD::Vertex> getSecondaryVertexWithSeed(
            const EventContext& ctx,
            const std::vector<const xAOD::TrackParticle*> &tracks,
            const xAOD::TrackParticleContainer *inDetTracks,
            const Amg::Vector3D& seed
        );
 
    private:
 
        typedef std::unique_ptr<xAOD::Vertex> vtxPtr_t;
 
    private:
 
        //
        // Properties:
        //
        ToolHandle<Trk::IVertexFitter> m_vertexFitter {
            this, "vertexFitterTool", "Trk::FastVertexFitter/FastVertexFitterTool"
        };
        ToolHandle<Trk::IVertexFitter> m_seedVertexFitter {
            this, "seedVertexFitterTool",
            "Trk::FastVertexFitter/FastVertexFitterTool"
        };
 
        Gaudi::Property<bool> m_doSeedVertexFit {
        this, "doSeedVertexFit", false
        };
 
        Gaudi::Property<std::string> m_distToPriVtxName {
        this, "DistToPriVtxName", "default"
        };
        Gaudi::Property<std::string> m_normDistToPriVtxName {
        this, "NormDistToPriVtxName", "default"
        };
        Gaudi::Property<std::string> m_distToRefittedPriVtxName {
        this, "DistToRefittedPriVtxName", "default"
        };
        Gaudi::Property<std::string> m_normDistToRefittedPriVtxName {
        this, "NormDistToRefittedPriVtxName", "default"
        };
        Gaudi::Property<std::string> m_distToRefittedRmLepPriVtxName {
        this, "DistToRefittedRmLepPriVtxName", "default"
        };
        Gaudi::Property<std::string> m_normDistToRefittedRmLepPriVtxName {
        this, "NormDistToRefittedRmLepPriVtxName", "default"
        };
 
        //
        // Variables
        //
        TStopwatch                                             m_timer;
        int                                                    m_countNumberOfFits{0};
        int                                                    m_countNumberOfFitsFailed{0};
        int                                                    m_countNumberOfFitsInvalid{0};
 
        int                                                    m_secondaryVertexIndex{0};
 
        std::unique_ptr<SG::AuxElement::Decorator<float> >     m_distToPriVtx;
        std::unique_ptr<SG::AuxElement::Decorator<float> >     m_normDistToPriVtx;
        std::unique_ptr<SG::AuxElement::Decorator<float> >     m_distToRefittedPriVtx;
        std::unique_ptr<SG::AuxElement::Decorator<float> >     m_normDistToRefittedPriVtx;
        std::unique_ptr<SG::AuxElement::Decorator<float> >     m_distToRefittedRmLepPriVtx;
        std::unique_ptr<SG::AuxElement::Decorator<float> >     m_normDistToRefittedRmLepPriVtx;
    };
} // namespace DerivationFramework
#endif  // LEPTONTAGGERS_VertexFittingTool_H