Event/BesDChain/include/BesDChain/util/KinematicData.h

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#ifndef DECAYCHAIN_KINEMATICDATA_H
#define DECAYCHAIN_KINEMATICDATA_H
 
#include "CLHEP/Vector/LorentzVector.h"
 
using CLHEP::HepLorentzVector;
 
namespace DecayChain {
 
  class KinematicData {
  public:
    KinematicData();
    KinematicData( const HepLorentzVector& p4 );
 
    void setUserTag( const int tag );
    void setCharge( const int aCharge );
    // void setMass( const double aMass );
    void setP4( const HepLorentzVector& aMomentum );
#ifdef EXTEND
    void recover() const { m_p4 = m_p4_bakup; }
#endif
 
    int    userTag() const;
    int    charge() const;
    double mass() const;
    double energy() const;
    // const Hep3Vector& momentum() const;
    const HepLorentzVector& p4() const;
 
  private:
    int                      m_userTag;
    int                      m_charge;
    mutable HepLorentzVector m_p4;
#ifdef EXTEND
    void bakup() {
      if ( m_hasbeenbakup ) return;
      m_p4_bakup     = m_p4;
      m_hasbeenbakup = true;
    }
    HepLorentzVector m_p4_bakup;
    bool             m_hasbeenbakup;
#endif
  };
} // namespace DecayChain
 
#endif