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EvtVectorParticle.cpp
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EvtVectorParticle.cpp
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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/>. *
***********************************************************************/
#include "EvtGenBase/EvtVectorParticle.hh"
#include "EvtGenBase/EvtComplex.hh"
#include "EvtGenBase/EvtPDL.hh"
#include "EvtGenBase/EvtPatches.hh"
#include "EvtGenBase/EvtReport.hh"
#include "EvtGenBase/EvtVector4C.hh"
#include <iostream>
#include <math.h>
#include <stdlib.h>
void EvtVectorParticle::init( EvtId part_n, double e, double px, double py,
double pz )
{
_validP4 = true;
setp( e, px, py, pz );
setpart_num( part_n );
_eps[0].set( 0.0, 1.0, 0.0, 0.0 );
_eps[1].set( 0.0, 0.0, 1.0, 0.0 );
_eps[2].set( 0.0, 0.0, 0.0, 1.0 );
setLifetime();
}
void EvtVectorParticle::init( EvtId part_n, const EvtVector4R& p4 )
{
_validP4 = true;
setp( p4 );
setpart_num( part_n );
_eps[0].set( 0.0, 1.0, 0.0, 0.0 );
_eps[1].set( 0.0, 0.0, 1.0, 0.0 );
_eps[2].set( 0.0, 0.0, 0.0, 1.0 );
setLifetime();
}
void EvtVectorParticle::init( EvtId part_n, const EvtVector4R& p4,
const EvtVector4C& epsin1,
const EvtVector4C& epsin2,
const EvtVector4C& epsin3 )
{
_validP4 = true;
setp( p4 );
setpart_num( part_n );
_eps[0] = epsin1;
_eps[1] = epsin2;
_eps[2] = epsin3;
setLifetime();
}
EvtSpinDensity EvtVectorParticle::rotateToHelicityBasis() const
{
static EvtVector4C eplus( 0.0, -1.0 / sqrt( 2.0 ),
EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
static EvtVector4C ezero( 0.0, 0.0, 0.0, 1.0 );
static EvtVector4C eminus( 0.0, 1.0 / sqrt( 2.0 ),
EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
static EvtVector4C eplusC( eplus.conj() );
static EvtVector4C ezeroC( ezero.conj() );
static EvtVector4C eminusC( eminus.conj() );
EvtSpinDensity R;
R.setDim( 3 );
for ( int i = 0; i < 3; i++ ) {
R.set( 0, i, (eplusC)*_eps[i] );
R.set( 1, i, (ezeroC)*_eps[i] );
R.set( 2, i, (eminusC)*_eps[i] );
}
return R;
}
EvtSpinDensity EvtVectorParticle::rotateToHelicityBasis( double alpha,
double beta,
double gamma ) const
{
EvtVector4C eplus( 0.0, -1.0 / sqrt( 2.0 ),
EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
EvtVector4C ezero( 0.0, 0.0, 0.0, 1.0 );
EvtVector4C eminus( 0.0, 1.0 / sqrt( 2.0 ),
EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
eplus.applyRotateEuler( alpha, beta, gamma );
ezero.applyRotateEuler( alpha, beta, gamma );
eminus.applyRotateEuler( alpha, beta, gamma );
EvtSpinDensity R;
R.setDim( 3 );
for ( int i = 0; i < 3; i++ ) {
R.set( 0, i, ( eplus.conj() ) * _eps[i] );
R.set( 1, i, ( ezero.conj() ) * _eps[i] );
R.set( 2, i, ( eminus.conj() ) * _eps[i] );
}
return R;
}

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