EvtTwoBodyVertex.hh

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#ifndef EVT_TWO_BODY_VERTEX_HH
#define EVT_TWO_BODY_VERTEX_HH
 
#include "EvtGenBase/EvtBlattWeisskopf.hh"
#include "EvtGenBase/EvtTwoBodyKine.hh"
 
#include <iostream>
#include <memory>
 
// Two-body propagator vertex AB->A,B with an attached Blatt-Weisskopf form factor.
 
class EvtTwoBodyVertex {
  public:
    EvtTwoBodyVertex();
    EvtTwoBodyVertex( double mA, double mB, double mAB, int L );
    EvtTwoBodyVertex( const EvtTwoBodyVertex& other );
    EvtTwoBodyVertex& operator=( const EvtTwoBodyVertex& other );
 
    double widthFactor( EvtTwoBodyKine x ) const;
    double formFactor( EvtTwoBodyKine x ) const;
    double phaseSpaceFactor( EvtTwoBodyKine x, EvtTwoBodyKine::Index ) const;
 
    inline int L() const { return m_LL; }
    inline double mA() const { return m_kine.mA(); }
    inline double mB() const { return m_kine.mB(); }
    inline double mAB() const { return m_kine.mAB(); }
    inline double pD() const { return m_p0; }
    void print( std::ostream& os ) const;
 
    void set_f( double R );
 
  private:
    EvtTwoBodyKine m_kine;
    int m_LL;
    double m_p0;
    std::unique_ptr<EvtBlattWeisskopf> m_f;    // optional Blatt-Weisskopf form factor
};
 
std::ostream& operator<<( std::ostream& os, const EvtTwoBodyVertex& v );
 
#endif