NeutralParticleParameterCalculator.h

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/*
  Copyright (C) 2002-2020 CERN for the benefit of the ATLAS collaboration
*/
 
#ifndef TRKVERTEXFITTERUTILS_NEUTRALPARTICLEPARCALCULATOR_H
#define TRKVERTEXFITTERUTILS_NEUTRALPARTICLEPARCALCULATOR_H
 
#include "AthenaBaseComps/AthAlgTool.h"
#include "GaudiKernel/ToolHandle.h"
#include "TrkVertexFitterInterfaces/INeutralParticleParameterCalculator.h"
 
#include "xAODTracking/TrackParticleContainer.h"  
#include "xAODTracking/Vertex.h"
 
 
 
 
namespace Trk
{
  class IVertexLinearizedTrackFactory;
  class LinearizedTrack;
 
  class NeutralParticleParameterCalculator : public AthAlgTool, virtual public INeutralParticleParameterCalculator
  {
  public:
    virtual StatusCode initialize() override;
 
    NeutralParticleParameterCalculator(const std::string& t, const std::string& n, const IInterface*  p);
    
    ~NeutralParticleParameterCalculator();
    
    virtual NeutralPerigee* createNeutralTrackFromVertex(const xAOD::Vertex& ) const override;
 
  private:
 
    std::pair<AmgMatrix(3,3),AmgMatrix(3,3)> getPosMomentumAndMomentumCovMatrix(const Trk::LinearizedTrack* linTrack,
                                                                                const AmgMatrix(3,3) & vrt_cov,
                                                                                const AmgMatrix(3,3) & vrt_weight) const;
   
    static AmgMatrix(3,3) getPhiThetaQOverPToPxPyPzJacobian(double qOverP,double theta,double phi) ;
 
    ToolHandle<Trk::IVertexLinearizedTrackFactory> m_LinearizedTrackFactory;
    bool m_linearizedTrackFactoryIsAvailable;
    
  };
 
}
 
#endif