EvtD0ToKSpipi.hh

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//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of models developed at BES collaboration
//      based on the EvtGen framework.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/BesCopyright
//      Copyright (A) 2006      Ping Rong-Gang @IHEP
//
// Module:  EvtD0ToKSpipi.cc
//
// Description: Model provided by user, see the mannual
//
// Modification history:
//
//    Liaoyuan Dong       Sep. 27, 2022       Module created
//
//------------------------------------------------------------------------
 
#ifndef EVTD0TOKSPIPI_HH
#define EVTD0TOKSPIPI_HH
 
#include "../EvtGenBase/EvtDecayProb.hh"
 
class EvtParticle;
 
class EvtD0ToKSpipi : public EvtDecayProb {
 
public:
  EvtD0ToKSpipi() {}
  virtual ~EvtD0ToKSpipi();
 
  void          getName( std::string& name );
  EvtDecayBase* clone();
 
  void init();
  void initProbMax();
  void decay( EvtParticle* p );
 
private:
  double AmplitudeSquare();
 
  EvtVector4R GetDaugMomLab( int i ) { return _p4Lab[i]; }
  EvtVector4R GetDaugMomCM( int i ) { return _p4CM[i]; }
  EvtVector4R GetDaugMomHel( int i ) { return _p4Hel[i]; }
 
  EvtComplex K_matrix( EvtVector4R p_pip, EvtVector4R p_pim );
  EvtComplex amplitude_LASS( EvtVector4R p_k0l, EvtVector4R p_pip, EvtVector4R p_pim,
                             std::string reso, double A_r, double Phi_r );
  EvtComplex Resonance2( EvtVector4R p4_p, EvtVector4R p4_d1, const EvtVector4R p4_d2,
                         double mag, double theta, double gamma, double bwm, int spin );
 
  EvtVector4R _p4Lab[10], _p4CM[10], _p4Hel[10];
  int         _nd;
 
  float      ar[13], phir[13];
  EvtComplex CP_mult[5], beta[5], fprod[5];
  double     tan2thetaC;
  double     pi180inv;
  double     mass_R[13], width_R[13];
  int        spin_R[13];
  double     frac1[3], frac2[3], frac3[3];
  double     rd[4], deltad[4], Rf[4];
  double     ma[5], g[5][5]; // Kmatrix_couplings
  int        tagmode; // Specify the tag mode to be used.  Key: {0:no-specified, 1:Kpi, 2:K3pi,
                      // 3:Kpipi0}
};
 
#endif