EvtMassAmp.hh

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#ifndef EVT_MASSAMP_HH
#define EVT_MASSAMP_HH
 
#include "EvtGenBase/EvtAmplitude.hh"
#include "EvtGenBase/EvtPoint1D.hh"
#include "EvtGenBase/EvtPropBreitWignerRel.hh"
#include "EvtGenBase/EvtTwoBodyVertex.hh"
 
#include <memory>
// Relativistic lineshape for a two-body decay of a resonance to two
// pseudoscalars. The mass dependence of the width and the vertex factors
// are included in the calculation.
 
class EvtMassAmp : public EvtAmplitude<EvtPoint1D> {
  public:
    EvtMassAmp( const EvtPropBreitWignerRel& prop, const EvtTwoBodyVertex& vd );
    EvtMassAmp( const EvtMassAmp& other );
    EvtMassAmp& operator=( const EvtMassAmp& other );
 
    EvtComplex amplitude( const EvtPoint1D& p ) const override;
 
    EvtAmplitude<EvtPoint1D>* clone() const override
    {
        return new EvtMassAmp( *this );
    }
 
    void setBirthVtx( const EvtTwoBodyVertex& vb )
    {
        m_vb = std::make_unique<EvtTwoBodyVertex>( vb );
    }
 
    void addBirthFact() { m_useBirthFact = true; }
    void addDeathFact() { m_useDeathFact = true; }
    void addBirthFactFF() { m_useBirthFactFF = true; }
    void addDeathFactFF() { m_useDeathFactFF = true; }
 
  private:
    EvtPropBreitWignerRel m_prop;
    EvtTwoBodyVertex m_vd;
    std::unique_ptr<EvtTwoBodyVertex> m_vb;
 
    bool m_useBirthFact;
    bool m_useDeathFact;
    bool m_useBirthFactFF;
    bool m_useDeathFactFF;
};
 
#endif