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() override;
    EvtDecayBase* clone() override;

    void decay( EvtParticle* p ) override;
    void init() override;

    void initProbMax() override;

  private:
    //  int whichfit;
    EvtComplex fT2( EvtVector4R p, EvtVector4R q, EvtTensor4C epsPI,
                    EvtVector4C epsEps, EvtVector4C epsEta );
    EvtComplex fT3( EvtVector4R p, EvtVector4R q, EvtTensor4C epsPI,
                    EvtVector4C epsEps, EvtVector4C epsEta );
    EvtId _ID0;
    int ncall;
};

#endif