include/EvtGenModels/EvtD0gammaDalitz.hh

0001
0002 /***********************************************************************
0003 * Copyright 1998-2020 CERN for the benefit of the EvtGen authors       *
0004 *                                                                      *
0005 * This file is part of EvtGen.                                         *
0006 *                                                                      *
0007 * EvtGen is free software: you can redistribute it and/or modify       *
0008 * it under the terms of the GNU General Public License as published by *
0009 * the Free Software Foundation, either version 3 of the License, or    *
0010 * (at your option) any later version.                                  *
0011 *                                                                      *
0012 * EvtGen is distributed in the hope that it will be useful,            *
0013 * but WITHOUT ANY WARRANTY; without even the implied warranty of       *
0014 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the        *
0015 * GNU General Public License for more details.                         *
0016 *                                                                      *
0017 * You should have received a copy of the GNU General Public License    *
0018 * along with EvtGen.  If not, see <https://www.gnu.org/licenses/>.     *
0019 ***********************************************************************/
0020
0021 #ifndef __EVTD0GAMMADALITZ_HH__
0022 #define __EVTD0GAMMADALITZ_HH__
0023
0024 #include "EvtGenBase/EvtCyclic3.hh"
0025 #include "EvtGenBase/EvtDalitzReso.hh"
0026 #include "EvtGenBase/EvtDecayAmp.hh"
0027 #include "EvtGenBase/EvtFlatte.hh"
0028 #include "EvtGenBase/EvtSpinType.hh"
0029
0030 #include <vector>
0031
0032 class EvtParticle;
0033
0034 class EvtD0gammaDalitz : public EvtDecayAmp {
0035   private:
0036     int _d1;
0037     int _d2;
0038     int _d3;
0039
0040     bool _isKsPiPi;
0041
0042     // Useful constants.
0043     static const EvtSpinType::spintype& _SCALAR;
0044     static const EvtSpinType::spintype& _VECTOR;
0045     static const EvtSpinType::spintype& _TENSOR;
0046
0047     static const EvtDalitzReso::CouplingType& _EtaPic;
0048     static const EvtDalitzReso::CouplingType& _PicPicKK;
0049
0050     static const EvtDalitzReso::NumType& _RBW;
0051     static const EvtDalitzReso::NumType& _GS;
0052     static const EvtDalitzReso::NumType& _KMAT;
0053
0054     static const EvtCyclic3::Pair& _AB;
0055     static const EvtCyclic3::Pair& _AC;
0056     static const EvtCyclic3::Pair& _BC;
0057
0058     // Values to be read or computed based on values in the evt.pdl file.
0059     // IDs of the relevant particles.
0060     EvtId _BP;
0061     EvtId _BM;
0062     EvtId _B0;
0063     EvtId _B0B;
0064     EvtId _D0;
0065     EvtId _D0B;
0066     EvtId _KM;
0067     EvtId _KP;
0068     EvtId _K0;
0069     EvtId _K0B;
0070     EvtId _KL;
0071     EvtId _KS;
0072     EvtId _PIM;
0073     EvtId _PIP;
0074
0075     // Flavor of the B mother.
0076     EvtId _bFlavor;
0077
0078     // Masses of the relevant particles.
0079     double _mD0;
0080     double _mKs;
0081     double _mPi;
0082     double _mK;
0083
0084     void readPDGValues();
0085     void reportInvalidAndExit() const;
0086
0087     EvtComplex dalitzKsPiPi( const EvtDalitzPoint& point ) const;
0088     EvtComplex dalitzKsKK( const EvtDalitzPoint& point ) const;
0089
0090   public:
0091     std::string getName() override;
0092     EvtDecayBase* clone() override;
0093
0094     void init() override;
0095     void initProbMax() override;
0096
0097     void decay( EvtParticle* p ) override;
0098 };
0099
0100 #endif