EvtPHSPBMix.h

//--------------------------------------------------------------------------
//
// Environment:
//      This software is part of the EvtGen package developed jointly
//      for the BaBar and CLEO collaborations.  If you use all or part
//      of it, please give an appropriate acknowledgement.
//
// Copyright Information: See EvtGen/COPYRIGHT
//      Copyright (C) 2002      INFN-Pisa
//
// Module: EvtPHSPBMix.cc
//
// Description:
//    Routine to decay vector-> particle particle with B0 mixing, coherent B0B0-like mixing if any.
//    EvtPHSPBBMix: handle  states with two neutral B
//    EvtPHSPBMix : handles states with only one neutral B
//    Phase-space kinematics, CP conservation, deltaGamma=0, p/q=1
//
//    Based on EvtVSSBMixCPT
//
// Modification history:
//
//   R. Louvot, EPFL, 2010/03/09
//   C. MacQueen, 2016/10/03            Adapted to Belle II
//
//------------------------------------------------------------------------
 
#pragma once
 
#include "EvtGenBase/EvtDecayAmp.hh"
#include "EvtGenBase/EvtParticle.hh"
#include "EvtGenBase/EvtComplex.hh"
 
class EvtPHSPBBMix: public EvtDecayAmp {
 
public:
 
  EvtPHSPBBMix() {}
 
  virtual ~EvtPHSPBBMix();
 
  std::string getName();
 
  EvtDecayBase* clone();
 
  void decay(EvtParticle* p);
 
  void init();
 
  void initProbMax();
 
  int nRealDaughters();
 
private:
 
  void prlp(int)const;
 
  EvtComplex Amplitude(const double& t1, const double& t2, bool B1_is_B0, bool B2_is_B0) const;
 
  double _freq{0};   //
 
  double _C{0}; //
 
  bool _BBpipi{0};
 
};
 
class EvtPHSPBMix : public EvtDecayAmp  {
 
public:
 
  EvtPHSPBMix() {}
 
  virtual ~EvtPHSPBMix();
 
  std::string getName();
 
  EvtDecayBase* clone();
 
  void decay(EvtParticle* p);
 
  void init();
 
  void initProbMax();
 
  int nRealDaughters();
 
private:
 
  double _freq{0};
 
};