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EvtD0mixDalitz.hh
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/***********************************************************************
* Copyright 1998-2020 CERN for the benefit of the EvtGen authors *
* *
* This file is part of EvtGen. *
* *
* EvtGen is free software: you can redistribute it and/or modify *
* it under the terms of the GNU General Public License as published by *
* the Free Software Foundation, either version 3 of the License, or *
* (at your option) any later version. *
* *
* EvtGen is distributed in the hope that it will be useful, *
* but WITHOUT ANY WARRANTY; without even the implied warranty of *
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
* GNU General Public License for more details. *
* *
* You should have received a copy of the GNU General Public License *
* along with EvtGen. If not, see <https://www.gnu.org/licenses/>. *
***********************************************************************/
#ifndef __EVTD0MIXDALITZ_HH__
#define __EVTD0MIXDALITZ_HH__
#include "EvtGenBase/EvtComplex.hh"
#include "EvtGenBase/EvtCyclic3.hh"
#include "EvtGenBase/EvtDalitzPoint.hh"
#include "EvtGenBase/EvtDalitzReso.hh"
#include "EvtGenBase/EvtDecayAmp.hh"
#include "EvtGenBase/EvtId.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtSpinType.hh"
// Description:
// The D0mixDalitz model, with many resonances and mixing implemented.
class EvtD0mixDalitz : public EvtDecayAmp {
private:
int _d1;
int _d2;
int _d3;
// Mixing parameters.
double _x;
double _y;
// q/p CP violation in the mixing.
EvtComplex _qp;
// Checker of the decay mode.
bool _isKsPiPi;
bool _isRBWmodel;
// Useful constants.
static const EvtSpinType::spintype& _SCALAR;
static const EvtSpinType::spintype& _VECTOR;
static const EvtSpinType::spintype& _TENSOR;
static const EvtDalitzReso::CouplingType& _EtaPic;
static const EvtDalitzReso::CouplingType& _PicPicKK;
static const EvtDalitzReso::NumType& _RBW;
static const EvtDalitzReso::NumType& _GS;
static const EvtDalitzReso::NumType& _KMAT;
static const EvtCyclic3::Pair& _AB;
static const EvtCyclic3::Pair& _AC;
static const EvtCyclic3::Pair& _BC;
// Values to be read or computed based on values in the evt.pdl file.
// IDs of the relevant particles.
EvtId _D0;
EvtId _D0B;
EvtId _KM;
EvtId _KP;
EvtId _K0;
EvtId _K0B;
EvtId _KL;
EvtId _KS;
EvtId _PIM;
EvtId _PIP;
// Masses of the relevant particles.
double _mD0;
double _mKs;
double _mPi;
double _mK;
// Life time and decay rate.
double _ctau;
double _gamma;
// Some useful integrals over the Dalitz plot.
EvtComplex _iChi;
EvtComplex _iChi2;
void readPDGValues();
EvtComplex dalitzKsPiPi( const EvtDalitzPoint& point );
EvtComplex dalitzKsKK( const EvtDalitzPoint& point );
// Time evolution functions for hamiltonian eigenstates.
// Negative exponential part removed.
EvtComplex h1( const double& ct ) const;
EvtComplex h2( const double& ct ) const;
void reportInvalidAndExit() const
{
EvtGenReport( EVTGEN_ERROR, "EvtD0mixDalitz" )
<< "EvtD0mixDalitz: Invalid mode." << std::endl;
exit( 1 );
}
public:
EvtD0mixDalitz() :
_d1( 0 ),
_d2( 0 ),
_d3( 0 ),
_x( 0. ),
_y( 0. ),
_qp( 1. ),
_isKsPiPi( false ),
_isRBWmodel( true )
{
}
// One-line inline functions.
std::string getName() override { return "D0MIXDALITZ"; }
EvtDecayBase* clone() override { return new EvtD0mixDalitz; }
void initProbMax() override { setProbMax( 5200. ); }
void init() override;
void decay( EvtParticle* p ) override;
};
#endif

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