EvtDiracParticle Class Reference

#include <EvtDiracParticle.hh>

Inheritance diagram for EvtDiracParticle:

Public Member Functions
	EvtDiracParticle ()
virtual	~EvtDiracParticle ()
void	init (EvtId part_n, const EvtVector4R &p4)
EvtDiracSpinor	spParent (int i) const
EvtDiracSpinor	sp (int i) const
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 EvtVector4C	epsParentPhoton (int i)
virtual EvtVector4C	epsPhoton (int i)
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 EvtDiracParticle.hh.

Constructor & Destructor Documentation

EvtDiracParticle()

EvtDiracParticle::EvtDiracParticle

(

)

Definition at line 37 of file EvtDiracParticle.cc.

{ return; }

~EvtDiracParticle()

EvtDiracParticle::~EvtDiracParticle ( )

virtual

Definition at line 35 of file EvtDiracParticle.cc.

{}

Member Function Documentation

init()

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

virtual

Initialiaze particle with id and 4momentum.

Implements EvtParticle.

Definition at line 39 of file EvtDiracParticle.cc.

                                                                 {
 
  _validP4 = true;
  setp( p4 );
  setpart_num( part_n );
 
  if ( EvtPDL::getStdHep( part_n ) == 0 )
  {
    report( ERROR, "EvtGen" ) << "Error in EvtDiracParticle::init, part_n=" << part_n.getId()
                              << endl;
    ::abort();
  }
 
  if ( EvtPDL::getStdHep( part_n ) > 0 )
  {
 
    _spinorRest[0].set( EvtComplex( sqrt( 2.0 * mass() ), 0.0 ), EvtComplex( 0.0, 0.0 ),
                        EvtComplex( 0.0, 0.0 ), EvtComplex( 0.0, 0.0 ) );
    _spinorRest[1].set( EvtComplex( 0.0, 0.0 ), EvtComplex( sqrt( 2.0 * mass() ), 0.0 ),
                        EvtComplex( 0.0, 0.0 ), EvtComplex( 0.0, 0.0 ) );
 
    _spinorParent[0] = boostTo( _spinorRest[0], p4 );
    _spinorParent[1] = boostTo( _spinorRest[1], p4 );
  }
  else
  {
 
    _spinorRest[0].set( EvtComplex( 0.0, 0.0 ), EvtComplex( 0.0, 0.0 ),
                        EvtComplex( sqrt( 2.0 * mass() ), 0.0 ), EvtComplex( 0.0, 0.0 ) );
    _spinorRest[1].set( EvtComplex( 0.0, 0.0 ), EvtComplex( 0.0, 0.0 ), EvtComplex( 0.0, 0.0 ),
                        EvtComplex( sqrt( 2.0 * mass() ), 0.0 ) );
 
    _spinorParent[0] = boostTo( _spinorRest[0], p4 );
    _spinorParent[1] = boostTo( _spinorRest[1], p4 );
  }
 
  setLifetime();
}

Referenced by EvtBsquark::decay(), and EvtParticleFactory::particleFactory().

rotateToHelicityBasis() [1/2]

EvtSpinDensity EvtDiracParticle::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 78 of file EvtDiracParticle.cc.

                                                             {
 
  EvtDiracSpinor spplus;
  EvtDiracSpinor spminus;
 
  double sqmt2 = sqrt( 2. * ( getP4().mass() ) );
 
  if ( EvtPDL::getStdHep( getId() ) > 0 )
  {
    spplus.set( 1.0, 0.0, 0.0, 0.0 );
    spminus.set( 0.0, 1.0, 0.0, 0.0 );
  }
  else
  {
    spplus.set( 0.0, 0.0, 1.0, 0.0 );
    spminus.set( 0.0, 0.0, 0.0, 1.0 );
  }
 
  EvtSpinDensity R;
  R.SetDim( 2 );
 
  for ( int i = 0; i < 2; i++ )
  {
    R.Set( 0, i, ( spplus * _spinorRest[i] ) / sqmt2 );
    R.Set( 1, i, ( spminus * _spinorRest[i] ) / sqmt2 );
  }
 
  return R;
}

rotateToHelicityBasis() [2/2]

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

virtual

Implements EvtParticle.

Definition at line 108 of file EvtDiracParticle.cc.

                                                                             {
 
  EvtDiracSpinor spplus;
  EvtDiracSpinor spminus;
 
  double sqmt2 = sqrt( 2. * ( getP4().mass() ) );
 
  if ( EvtPDL::getStdHep( getId() ) > 0 )
  {
    spplus.set( 1.0, 0.0, 0.0, 0.0 );
    spminus.set( 0.0, 1.0, 0.0, 0.0 );
  }
  else
  {
    spplus.set( 0.0, 0.0, 1.0, 0.0 );
    spminus.set( 0.0, 0.0, 0.0, 1.0 );
  }
 
  spplus.applyRotateEuler( alpha, beta, gamma );
  spminus.applyRotateEuler( alpha, beta, gamma );
 
  EvtSpinDensity R;
  R.SetDim( 2 );
 
  for ( int i = 0; i < 2; i++ )
  {
    R.Set( 0, i, ( spplus * _spinorRest[i] ) / sqmt2 );
    R.Set( 1, i, ( spminus * _spinorRest[i] ) / sqmt2 );
  }
 
  return R;
}

sp()

EvtDiracSpinor EvtDiracParticle::sp ( int i ) const

inlinevirtual

Returns Dirac spinor in the particles own restframe for a Dirac particle.

Reimplemented from EvtParticle.

Definition at line 38 of file EvtDiracParticle.hh.

{ return _spinorRest[i]; }

spParent()

EvtDiracSpinor EvtDiracParticle::spParent ( int i ) const

inlinevirtual

Returns Dirac spinor in the parents restframe for a Dirac particle.

Reimplemented from EvtParticle.

Definition at line 37 of file EvtDiracParticle.hh.

{ return _spinorParent[i]; }

Referenced by EvtBsquark::decay(), and EvtLambdaP_BarGamma::decay().

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

• EvtDiracParticle.hh
• EvtDiracParticle.cc