EvtTwoBodyKine.hh

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#ifndef EVT_TWO_BODY_KINE_HH
#define EVT_TWO_BODY_KINE_HH
 
#include <iostream>
 
// Descriptions of the kinematics of a two-body decay.
 
class EvtTwoBodyKine {
  public:
    enum Index
    {
        A,
        B,
        AB
    };
 
    EvtTwoBodyKine();
    EvtTwoBodyKine( const double mA, const double mB, const double mAB );
 
    // Accessors
 
    inline double mA() const { return m_mA; }
    inline double mB() const { return m_mB; }
    inline double mAB() const { return m_mAB; }
    double m( Index i = AB ) const;
 
    // Momentum of the other two particles in the
    // rest-frame of particle i.
 
    double p( Index i = AB ) const;
 
    // Energy of particle i in the rest frame of particle j
 
    double e( Index i, Index j ) const;
 
    void print( std::ostream& os ) const;
 
  private:
    double m_mA;
    double m_mB;
    double m_mAB;
};
 
std::ostream& operator<<( std::ostream& os, const EvtTwoBodyKine& p );
 
#endif