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EvtAmp.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 EVTAMP_HH
#define EVTAMP_HH
#include "EvtGenBase/EvtComplex.hh"
#include "EvtGenBase/EvtPatches.hh"
class EvtSpinDensity;
class EvtId;
class EvtAmp {
public:
EvtAmp();
EvtAmp( const EvtAmp& amp );
void init( EvtId p, int ndaug, EvtId* daug );
void setAmp( int* ind, const EvtComplex& amp );
const EvtComplex& getAmp( int* ind ) const;
EvtSpinDensity getSpinDensity();
EvtSpinDensity contract( int i, const EvtAmp& a );
EvtAmp contract( int i, const EvtSpinDensity& rho );
//sum over the i:th daugther of a1 and contract with parent of a2
EvtAmp contract( int i, const EvtAmp& a1, const EvtAmp& a2 );
EvtSpinDensity getForwardSpinDensity( EvtSpinDensity* rho_list, int k );
EvtSpinDensity getBackwardSpinDensity( EvtSpinDensity* rho_list );
EvtAmp& operator=( const EvtAmp& amp );
/**
* sets the amplitudes calculated in the decay objects
*/
void vertex( const EvtComplex& amp );
/**
* sets the amplitudes calculated in the decay objects
*/
void vertex( int i1, const EvtComplex& amp );
/**
* sets the amplitudes calculated in the decay objects
*/
void vertex( int i1, int i2, const EvtComplex& amp );
/**
* sets the amplitudes calculated in the decay objects
*/
void vertex( int i1, int i2, int i3, const EvtComplex& amp );
/**
* sets the amplitudes calculated in the decay objects
*/
void vertex( int* i1, const EvtComplex& amp );
void dump();
private:
friend class EvtDecayAmp;
friend class EvtKstarstargamma;
void setNDaug( int n );
void setNState( int parent_states, int* daug_states );
// the amplitudes
EvtComplex _amp[125];
// the number of daughters
int _ndaug;
// the number of states of the parent
int _pstates;
// number of states of the daughter
int dstates[10];
// the nontrivial index of the daughter
int _dnontrivial[10];
// number of nontrivial daugts+parent
int _nontrivial;
// compact nstates
int _nstate[5];
};
#endif

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