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EvtBtoKD3P.hh
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EvtBtoKD3P.hh
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//-----------------------------------------------------------------------
// File and Version Information:
// $Id: EvtBtoKD3P.hh,v 1.1 2009-03-16 16:49:00 robbep 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/EvtDecayAmp.hh"
#include "EvtGenBase/EvtComplex.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;}
std::string getName();
protected:
// parameters:
double _r;
EvtComplex _exp;
// other:
const EvtDecayBase * _model1;
const EvtDecayBase * _model2;
bool _decayedOnce;
};
#endif

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