EvtBtoKD3P.hh

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//-----------------------------------------------------------------------
// File and Version Information:
//      $Id: EvtBtoKD3P.hh,v 1.1.1.2 2007/10/26 05:03:14 pingrg Exp $
//
// 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:
//      Copyright (C) 2003, Colorado State University
//
// Module creator:
//      Abi soffer, CSU, 2003
//-----------------------------------------------------------------------
 
// Decay model that does the decay B+ -> K+ D , D -> 3 psudoscalars.
//
// The B- daughters specified in the decay file should be K-, D0, D0,
// where the first D0 is produced via b->c decay and the second via b->u.
// In reality, only one D daughter exists, so the first two
// daughters must be defined to decay to the same final state using
// the EvtPto3P model, but with CP-conjugate amplitudes.
//
// For a given point in the Pto3P Dalitz plot,
// the total amplitude is \propto [A1 + A2 r exp(i(phase))], where
//
// A1 & A2 are the amplitudes of the D0 and D0bar to decay into that
// Dalitz plot point,
//
// r is the (positive) ratio between the A(B->B0bar K) and A(B->D0 K)
// B decay amplitudes,
//
// phase is the total phase difference (weak phase + strong phase) between
// A(B->D0bar K) and A(B->B0 K).
//
// Note that this model knows nothing about your convention for the
// sign of the phase, so when specifying the decay of a B- you need to
// change the order of D0 and D0bar and change the total phase so that
// the sign of the weak phase flips with respect to the parameters of B+.
//
 
#ifndef EVT_BTOKD3P
#define EVT_BTOKD3P
 
class EvtParticle;
#include "../EvtGenBase/EvtComplex.hh"
#include "../EvtGenBase/EvtDecayAmp.hh"
 
class EvtBtoKD3P : public EvtDecayAmp {
 
public:
  EvtBtoKD3P();
  EvtBtoKD3P( const EvtBtoKD3P& other );
  virtual ~EvtBtoKD3P();
  EvtDecayBase* clone();
 
  // Initialize model
  virtual void init();
  virtual void initProbMax();
  virtual void decay( EvtParticle* p );
 
  // we really have two daughters, although three are listed in the .dec file:
  virtual int nRealDaughters() { return 2; }
 
  void getName( std::string& model_name );
 
protected:
  // parameters:
  double     _r;
  EvtComplex _exp;
 
  // other:
  const EvtDecayBase* _model1;
  const EvtDecayBase* _model2;
  bool                _decayedOnce;
};
 
#endif