EvtXPsiGamma.hh

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#ifndef EVTXPSIGAMMA_HH
#define EVTXPSIGAMMA_HH
 
#include "EvtGenBase/EvtDecayAmp.hh"
#include "EvtGenBase/EvtId.hh"
 
#include <fstream>
#include <stdio.h>
 
class EvtComplex;
class EvtParticle;
class EvtTensor4C;
class EvtVector4C;
class EvtVector4R;
 
// Description:Implementation of the X3872(2-+) -> J/psi gamma decay
// Description: Routine to implement radiative decay X3872(2-+) -> J/psi gamma
//      according to F. Brazzi et al, arXiv:1103.3155
 
class EvtXPsiGamma : public EvtDecayAmp {
  public:
    std::string getName() const override;
    EvtDecayBase* clone() const override;
 
    void init() override;
    void initProbMax() override;
    void decay( EvtParticle* p ) override;
 
  protected:
    // This function is not declared const because epsParentPhoton is not const
    void calcAmp( EvtParticle& parent, EvtAmp& amp );
 
  private:
    double calcPstar( double m_parent, double m_1, double m_2 ) const;
 
    EvtComplex fT2( EvtVector4R p, EvtVector4R q, EvtTensor4C epsPI,
                    EvtVector4C epsEps, EvtVector4C epsEta ) const;
    EvtComplex fT3( EvtVector4R p, EvtVector4R q, EvtTensor4C epsPI,
                    EvtVector4C epsEps, EvtVector4C epsEta ) const;
 
    EvtId m_ID0;
 
    double m_gOmega;
    double m_gPOmega;
    double m_gRho;
    double m_gPRho;
    double m_fOmega;
    double m_fRho;
};
 
#endif