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