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EvtRaritaSchwinger.cpp
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EvtRaritaSchwinger.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/EvtRaritaSchwinger.hh"
#include "EvtGenBase/EvtPatches.hh"
using std::endl;
using std::ostream;
EvtRaritaSchwinger rotateEuler( const EvtRaritaSchwinger& rs, double alpha,
double beta, double gamma )
{
EvtRaritaSchwinger tmp( rs );
tmp.applyRotateEuler( alpha, beta, gamma );
return tmp;
}
EvtRaritaSchwinger boostTo( const EvtRaritaSchwinger& rs, const EvtVector4R p4 )
{
EvtRaritaSchwinger tmp( rs );
tmp.applyBoostTo( p4 );
return tmp;
}
EvtRaritaSchwinger boostTo( const EvtRaritaSchwinger& rs, const EvtVector3R boost )
{
EvtRaritaSchwinger tmp( rs );
tmp.applyBoostTo( boost );
return tmp;
}
void EvtRaritaSchwinger::set( int i, int j, const EvtComplex& sp )
{
_rs[i][j] = sp;
}
EvtComplex EvtRaritaSchwinger::get( int i, int j ) const
{
return _rs[i][j];
}
void EvtRaritaSchwinger::applyRotateEuler( double alpha, double beta,
double gamma )
{
//inefficient but simple to code...
EvtVector4C v0 = getVector( 0 );
EvtVector4C v1 = getVector( 1 );
EvtVector4C v2 = getVector( 2 );
EvtVector4C v3 = getVector( 3 );
v0.applyRotateEuler( alpha, beta, gamma );
v1.applyRotateEuler( alpha, beta, gamma );
v2.applyRotateEuler( alpha, beta, gamma );
v3.applyRotateEuler( alpha, beta, gamma );
setVector( 0, v0 );
setVector( 1, v1 );
setVector( 2, v2 );
setVector( 3, v3 );
EvtDiracSpinor sp0 = getSpinor( 0 );
EvtDiracSpinor sp1 = getSpinor( 1 );
EvtDiracSpinor sp2 = getSpinor( 2 );
EvtDiracSpinor sp3 = getSpinor( 3 );
sp0.applyRotateEuler( alpha, beta, gamma );
sp1.applyRotateEuler( alpha, beta, gamma );
sp2.applyRotateEuler( alpha, beta, gamma );
sp3.applyRotateEuler( alpha, beta, gamma );
setSpinor( 0, sp0 );
setSpinor( 1, sp1 );
setSpinor( 2, sp2 );
setSpinor( 3, sp3 );
}
void EvtRaritaSchwinger::applyBoostTo( const EvtVector4R p4 )
{
double e = p4.get( 0 );
EvtVector3R boost( p4.get( 1 ) / e, p4.get( 2 ) / e, p4.get( 3 ) / e );
applyBoostTo( boost );
return;
}
void EvtRaritaSchwinger::applyBoostTo( const EvtVector3R boost )
{
//inefficient but simple to code...
EvtVector4C v0 = getVector( 0 );
EvtVector4C v1 = getVector( 1 );
EvtVector4C v2 = getVector( 2 );
EvtVector4C v3 = getVector( 3 );
v0.applyBoostTo( boost );
v1.applyBoostTo( boost );
v2.applyBoostTo( boost );
v3.applyBoostTo( boost );
setVector( 0, v0 );
setVector( 1, v1 );
setVector( 2, v2 );
setVector( 3, v3 );
EvtDiracSpinor sp0 = getSpinor( 0 );
EvtDiracSpinor sp1 = getSpinor( 1 );
EvtDiracSpinor sp2 = getSpinor( 2 );
EvtDiracSpinor sp3 = getSpinor( 3 );
sp0.applyBoostTo( boost );
sp1.applyBoostTo( boost );
sp2.applyBoostTo( boost );
sp3.applyBoostTo( boost );
setSpinor( 0, sp0 );
setSpinor( 1, sp1 );
setSpinor( 2, sp2 );
setSpinor( 3, sp3 );
}
ostream& operator<<( ostream& s, const EvtRaritaSchwinger& rs )
{
int i, j;
s << endl;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
s << rs._rs[i][j];
}
s << endl;
}
return s;
}
EvtVector4C EvtRaritaSchwinger::getVector( int i ) const
{
EvtVector4C tmp( _rs[i][0], _rs[i][1], _rs[i][2], _rs[i][3] );
return tmp;
}
EvtDiracSpinor EvtRaritaSchwinger::getSpinor( int i ) const
{
EvtDiracSpinor tmp;
tmp.set( _rs[0][i], _rs[1][i], _rs[2][i], _rs[3][i] );
return tmp;
}
void EvtRaritaSchwinger::setVector( int i, const EvtVector4C& v )
{
_rs[i][0] = v.get( 0 );
_rs[i][1] = v.get( 1 );
_rs[i][2] = v.get( 2 );
_rs[i][3] = v.get( 3 );
}
void EvtRaritaSchwinger::setSpinor( int i, const EvtDiracSpinor& sp )
{
_rs[0][i] = sp.get_spinor( 0 );
_rs[1][i] = sp.get_spinor( 1 );
_rs[2][i] = sp.get_spinor( 2 );
_rs[3][i] = sp.get_spinor( 3 );
}
EvtRaritaSchwinger dirProd( EvtVector4R v, EvtDiracSpinor u )
{
int i, j;
EvtRaritaSchwinger tmp;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
tmp._rs[i][j] = u.get_spinor( i ) * v.get( j );
}
}
return tmp;
}
EvtRaritaSchwinger dirProd( EvtVector4C v, EvtDiracSpinor u )
{
int i, j;
EvtRaritaSchwinger tmp;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
tmp._rs[i][j] = u.get_spinor( i ) * v.get( j );
}
}
return tmp;
}
EvtComplex operator*( const EvtRaritaSchwinger& u1, const EvtRaritaSchwinger& u2 )
{
int i, j;
EvtComplex tmp = 0.0;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
tmp += conj( u1._rs[i][j] ) * u2._rs[i][j];
}
}
return tmp;
}
EvtRaritaSchwinger& EvtRaritaSchwinger::operator+=( const EvtRaritaSchwinger& u2 )
{
int i, j;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
_rs[i][j] += u2._rs[i][j];
}
}
return *this;
}
EvtRaritaSchwinger operator+( const EvtRaritaSchwinger& u1,
const EvtRaritaSchwinger& u2 )
{
return EvtRaritaSchwinger( u1 ) += u2;
}
EvtRaritaSchwinger& EvtRaritaSchwinger::operator-=( const EvtRaritaSchwinger& u2 )
{
int i, j;
for ( i = 0; i < 4; i++ ) {
for ( j = 0; j < 4; j++ ) {
_rs[i][j] += u2._rs[i][j];
}
}
return *this;
}
EvtRaritaSchwinger operator-( const EvtRaritaSchwinger& u1,
const EvtRaritaSchwinger& u2 )
{
return EvtRaritaSchwinger( u1 ) -= u2;
}

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