EvtPhotonParticle Class Reference

#include <EvtPhotonParticle.hh>

Inheritance diagram for EvtPhotonParticle:

Public Member Functions
	EvtPhotonParticle ()
virtual	~EvtPhotonParticle ()
void	init (EvtId part_n, double e, double px, double py, double pz)
void	init (EvtId part_n, const EvtVector4R &p4)
EvtVector4C	epsParentPhoton (int i)
EvtVector4C	epsPhoton (int i)
EvtSpinDensity	rotateToHelicityBasis () const
EvtSpinDensity	rotateToHelicityBasis (double alpha, double beta, double gamma) const
Public Member Functions inherited from EvtParticle
	EvtParticle ()
virtual	~EvtParticle ()
virtual EvtVector4C	epsParent (int i) const
virtual EvtVector4C	eps (int i) const
virtual EvtDiracSpinor	spParent (int) const
virtual EvtDiracSpinor	sp (int) const
virtual EvtDiracSpinor	spParentNeutrino () const
virtual EvtDiracSpinor	spNeutrino () const
virtual EvtTensor4C	epsTensorParent (int i) const
virtual EvtTensor4C	epsTensor (int i) const
void	addDaug (EvtParticle *node)
void	decay ()
void	deleteTree ()
void	deleteDaughters (bool keepChannel=false)
void	setChannel (int i)
void	setGeneratorFlag (int flag)
int	getGeneratorFlag ()
void	setIntFlag (std::vector< int > vi)
std::vector< int >	getIntFlag ()
void	makeDaughters (int ndaug, EvtId *id)
double	initializePhaseSpace (int numdaughter, EvtId *daughters, double poleSize=-1., int whichTwo1=0, int whichTwo2=1)
EvtParticle *	getDaug (int i)
EvtParticle *	nextIter (EvtParticle *rootOfTree=0)
void	makeStdHep (EvtStdHep &stdhep, EvtSecondary &secondary, EvtId *stable_parent_ihep)
void	makeStdHep (EvtStdHep &stdhep)
EvtVector4R	getP4Lab ()
EvtVector4R	getP4Restframe ()
EvtVector4R	get4Pos ()
EvtParticle *	getParent ()
void	insertDaugPtr (int idaug, EvtParticle *partptr)
double	mass () const
int	firstornot () const
void	setFirstOrNot ()
void	resetFirstOrNot ()
EvtId	getId () const
EvtSpinType::spintype	getSpinType () const
int	getSpinStates () const
const EvtVector4R &	getP4 () const
void	setP4 (const EvtVector4R &p4)
int	getChannel () const
int	getNDaug () const
void	resetNDaug ()
void	printTree () const
void	printTreeRec (int level) const
std::string	writeTreeRec (std::string) const
void	dumpTree () const
void	dumpTreeRec (int level, int dj) const
std::string	treeStr () const
std::string	treeStrRec (int level) const
void	printParticle () const
void	setLifetime (double tau)
void	setLifetime ()
double	getLifetime ()
void	setDiagonalSpinDensity ()
void	setVectorSpinDensity ()
void	setPolarizedSpinDensity (double r00, double r11, double r22)
void	setSpinDensityForward (const EvtSpinDensity &rho)
void	setSpinDensityForwardHelicityBasis (const EvtSpinDensity &rho)
void	setSpinDensityForwardHelicityBasis (const EvtSpinDensity &rho, double alpha, double beta, double gamma)
EvtSpinDensity	getSpinDensityForward ()
void	setSpinDensityBackward (const EvtSpinDensity &rho)
EvtSpinDensity	getSpinDensityBackward ()
void	noLifeTime ()
void	setId (EvtId id)
void	initDecay (bool useMinMass=false)
void	generateMassTree ()
double	compMassProb ()
void	setMass (double m)
bool	isInitialized ()
bool	hasValidP4 ()
bool	isDecayed ()
double *	decayProb ()
void	setDecayProb (double p)
void	setInclusiveMode (int im)
int	getInclusiveMode ()

Additional Inherited Members
Static Public Attributes inherited from EvtParticle
static int	_NextLevelDauNum = 0
static EvtId	_NextLevelId [20]
static EvtVector4R	_NextLevelP4 [20]
Protected Member Functions inherited from EvtParticle
void	setp (double e, double px, double py, double pz)
void	setp (const EvtVector4R &p4)
void	setpart_num (EvtId particle_number)
Protected Attributes inherited from EvtParticle
bool	_validP4

Detailed Description

Definition at line 31 of file EvtPhotonParticle.hh.

Constructor & Destructor Documentation

EvtPhotonParticle()

EvtPhotonParticle::EvtPhotonParticle ( )

inline

Definition at line 34 of file EvtPhotonParticle.hh.

{}

~EvtPhotonParticle()

EvtPhotonParticle::~EvtPhotonParticle ( )

virtual

Definition at line 31 of file EvtPhotonParticle.cc.

{}

Member Function Documentation

epsParentPhoton()

EvtVector4C EvtPhotonParticle::epsParentPhoton ( int i )

virtual

Returns polarization vector in the parents restframe for a photon.

Reimplemented from EvtParticle.

Definition at line 50 of file EvtPhotonParticle.cc.

                                                      {
 
  if ( !_evalBasis )
  {
 
    _evalBasis = 1;
    eps1.set( EvtComplex( 0.0, 0.0 ), EvtComplex( -1.0 / sqrt( 2.0 ), 0.0 ),
              EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), EvtComplex( 0.0, 0.0 ) );
    eps2.set( EvtComplex( 0.0, 0.0 ), EvtComplex( 1.0 / sqrt( 2.0 ), 0.0 ),
              EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), EvtComplex( 0.0, 0.0 ) );
 
    // These are for photon along z axis.  Rotate to get
    // correct direction...
 
    double phi, theta;
 
    EvtVector4R p = this->getP4();
 
    double px = p.get( 1 );
    double py = p.get( 2 );
    double pz = p.get( 3 );
 
    phi   = atan2( py, px );
    theta = acos( pz / sqrt( px * px + py * py + pz * pz ) );
    eps1.applyRotateEuler( phi, theta, -phi );
    eps2.applyRotateEuler( phi, theta, -phi );
  }
 
  EvtVector4C temp;
 
  switch ( i )
  {
 
  case 0: temp = eps1; break;
  case 1: temp = eps2; break;
  default:
    report( ERROR, "EvtGen" ) << "EvtPhotonParticle.cc: Asked "
                              << "for state:" << i << endl;
    ::abort();
    break;
  }
 
  return temp;
}

Referenced by EvtLambdaP_BarGamma::decay().

epsPhoton()

EvtVector4C EvtPhotonParticle::epsPhoton ( int i )

virtual

Returns polarization vector in the particles own restframe for a photon.

Reimplemented from EvtParticle.

Definition at line 95 of file EvtPhotonParticle.cc.

                                                {
 
  report( ERROR, "EvtGen" ) << "EvtPhotonParticle.cc: Can not get "
                            << "state in photons restframe." << endl;
  ;
  ::abort();
  return EvtVector4C();
}

init() [1/2]

void EvtPhotonParticle::init ( EvtId part_n, const EvtVector4R & p4 )

virtual

Initialiaze particle with id and 4momentum.

Implements EvtParticle.

Definition at line 33 of file EvtPhotonParticle.cc.

                                                                  {
 
  init( part_n, p4.get( 0 ), p4.get( 1 ), p4.get( 2 ), p4.get( 3 ) );
}

init() [2/2]

void EvtPhotonParticle::init	(	EvtId	part_n,
		double	e,
		double	px,
		double	py,
		double	pz )

Definition at line 38 of file EvtPhotonParticle.cc.

                                                                                      {
 
  _validP4 = true;
  setp( e, px, py, pz );
  setpart_num( part_n );
 
  setLifetime();
 
  // defere calculation of basis vectors untill they are needed!
  _evalBasis = 0;
}

Referenced by EvtKstarstargamma::decay(), EvtPHOTOS::doRadCorr(), init(), and EvtParticleFactory::particleFactory().

rotateToHelicityBasis() [1/2]

EvtSpinDensity EvtPhotonParticle::rotateToHelicityBasis ( ) const

virtual

Returns a rotation matrix need to rotate the basis state to the helicity basis. The EvtSpinDensity matrix is just use as a matrix here. This function is to be implemented in each derived class.

Implements EvtParticle.

Definition at line 104 of file EvtPhotonParticle.cc.

                                                              {
 
  EvtVector4C eplus( 0.0, -1.0 / sqrt( 2.0 ), EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
  EvtVector4C eminus( 0.0, 1.0 / sqrt( 2.0 ), EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
 
  // Really uggly have to cast away constness because the
  // function epsParentPhoton caches the state vectors...
  EvtVector4C e1 = ( (EvtParticle*)this )->epsParentPhoton( 0 );
  EvtVector4C e2 = ( (EvtParticle*)this )->epsParentPhoton( 1 );
 
  EvtSpinDensity R;
  R.SetDim( 2 );
 
  R.Set( 0, 0, ( eplus.conj() ) * e1 );
  R.Set( 0, 1, ( eplus.conj() ) * e2 );
 
  R.Set( 1, 0, ( eminus.conj() ) * e1 );
  R.Set( 1, 1, ( eminus.conj() ) * e2 );
 
  return R;
}

rotateToHelicityBasis() [2/2]

EvtSpinDensity EvtPhotonParticle::rotateToHelicityBasis ( double alpha, double beta, double gamma ) const

virtual

Implements EvtParticle.

Definition at line 126 of file EvtPhotonParticle.cc.

                                                                              {
 
  EvtVector4C eplus( 0.0, -1.0 / sqrt( 2.0 ), EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
  EvtVector4C eminus( 0.0, 1.0 / sqrt( 2.0 ), EvtComplex( 0.0, -1.0 / sqrt( 2.0 ) ), 0.0 );
 
  eplus.applyRotateEuler( alpha, beta, gamma );
  eminus.applyRotateEuler( alpha, beta, gamma );
 
  // Really uggly have to cast away constness because the
  // function epsParentPhoton caches the state vectors...
  EvtVector4C e1 = ( (EvtParticle*)this )->epsParentPhoton( 0 );
  EvtVector4C e2 = ( (EvtParticle*)this )->epsParentPhoton( 1 );
 
  EvtSpinDensity R;
  R.SetDim( 2 );
 
  R.Set( 0, 0, ( eplus.conj() ) * e1 );
  R.Set( 0, 1, ( eplus.conj() ) * e2 );
 
  R.Set( 1, 0, ( eminus.conj() ) * e1 );
  R.Set( 1, 1, ( eminus.conj() ) * e2 );
 
  return R;
}

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The documentation for this class was generated from the following files:

• EvtPhotonParticle.hh
• EvtPhotonParticle.cc