G4Parton Class Reference

#include <G4Parton.hh>

Public Member Functions
	G4Parton ()
	G4Parton (G4int PDGencoding)
	G4Parton (const G4Parton &right)
	~G4Parton ()
G4Parton &	operator= (const G4Parton &right)
G4bool	operator== (const G4Parton &right) const
G4bool	operator!= (const G4Parton &right) const
G4int	GetPDGcode () const
G4ParticleDefinition *	GetDefinition ()
void	SetDefinition (G4ParticleDefinition *aDefinition)
void	DefineMomentumInZ (G4double aLightConeMomentum, G4bool aDirection)
void	DefineMomentumInZ (G4double aLightConeMomentum, G4double aLightConeE, G4bool aDirection)
const G4ThreeVector &	GetPosition () const
void	SetPosition (const G4ThreeVector &aPosition)
const G4LorentzVector &	Get4Momentum () const
void	Set4Momentum (const G4LorentzVector &aMomentum)
void	SetX (G4double anX)
G4double	GetX ()
void	SetColour (G4int aColour)
G4int	GetColour ()
void	SetIsoSpinZ (G4double anIsoSpinZ)
G4double	GetIsoSpinZ ()
void	SetSpinZ (G4double aSpinZ)
G4double	GetSpinZ ()

Public Attributes
G4int	PDGencoding
G4ParticleDefinition *	theDefinition

Detailed Description

Definition at line 47 of file G4Parton.hh.

Constructor & Destructor Documentation

G4Parton() [1/3]

G4Parton::G4Parton ( )

inline

Definition at line 50 of file G4Parton.hh.

      {
        // CAUTION: 
        // this is a preliminary definition yielding u and d quarks only!
        //
        PDGencoding=(G4int)(2.*G4UniformRand()); 
        theColour = (G4int)(3.*G4UniformRand())+1;
        theIsoSpinZ = ((G4int)(G4UniformRand()))-0.5;
        theSpinZ = ((G4int)(G4UniformRand()))-0.5;
      }

G4Parton() [2/3]

G4Parton::G4Parton

(

G4int

PDGencoding

)

Definition at line 39 of file G4Parton.cc.

{
    PDGencoding=PDGcode;
    theX = 0;
    theDefinition=G4ParticleTable::GetParticleTable()->FindParticle(PDGencoding);
    if (theDefinition == NULL)
    {
      G4cout << "Encoding = "<<PDGencoding<<G4endl;
      G4String text = "G4Parton::GetDefinition(): Encoding not in particle table";
      throw G4HadronicException(__FILE__, __LINE__, text);
    }
    //
    // colour by random in (1,2,3)=(R,G,B) for quarks and 
    //                  in (-1,-2,-3)=(Rbar,Gbar,Bbar) for anti-quarks:
  //
    if (theDefinition->GetParticleType() == "quarks") {
        theColour = ((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding) ;
    }
    //
    // colour by random in (-1,-2,-3)=(Rbar,Gbar,Bbar)=(GB,RB,RG) for di-quarks and
    //                  in (1,2,3)=(R,G,B)=(GB,RB,RG) for anti-di-quarks:
  //
    else if (theDefinition->GetParticleType() == "diquarks") {
        theColour = -((G4int)(3.*G4UniformRand())+1)*(std::abs(PDGencoding)/PDGencoding);
    }
    //
    // colour by random in (-11,-12,...,-33)=(RRbar,RGbar,RBbar,...,BBbar) for gluons:
  //
    else if (theDefinition->GetParticleType() == "gluons") {
        theColour = -(((G4int)(3.*G4UniformRand())+1)*10 + ((G4int)(3.*G4UniformRand())+1));
    }
    else {
      G4cout << "Encoding = "<<PDGencoding<<G4endl;
      G4String text = "G4Parton::GetDefinition(): Particle is not a parton";
      throw G4HadronicException(__FILE__, __LINE__, text);
    }
    //  
    // isospin-z from PDG-encoded isospin-z for 
    // quarks, anti-quarks, di-quarks, and anti-di-quarks:
  //
    if ((theDefinition->GetParticleType() == "quarks") || (theDefinition->GetParticleType() == "diquarks")){
        theIsoSpinZ = theDefinition->GetPDGIsospin3();
    }
    //
  // isospin-z choosen at random from PDG-encoded isospin for gluons (should be zero):
    //
    else {
        G4int thisPDGiIsospin=theDefinition->GetPDGiIsospin();
        if (thisPDGiIsospin == 0) {
            theIsoSpinZ = 0;
        }
        else {
            theIsoSpinZ = ((G4int)((thisPDGiIsospin+1)*G4UniformRand()))-thisPDGiIsospin*0.5;
        }
    }
    //
    // spin-z choosen at random from PDG-encoded spin:
    //
    G4int thisPDGiSpin=theDefinition->GetPDGiSpin();
    if (thisPDGiSpin == 0) {
        theSpinZ = 0;
    }
    else {
        G4int rand=((G4int)((thisPDGiSpin+1)*G4UniformRand()));
        theSpinZ = rand-thisPDGiSpin*0.5;;
    }
}

G4Parton() [3/3]

G4Parton::G4Parton

(

const G4Parton &

right

)

Definition at line 107 of file G4Parton.cc.

{
    PDGencoding = right.PDGencoding;
    theMomentum = right.theMomentum;
    thePosition = right.thePosition;
    theX = right.theX;
    theDefinition = right.theDefinition;
    theColour = right.theColour;
    theIsoSpinZ = right.theIsoSpinZ;
    theSpinZ = right.theSpinZ;
}

~G4Parton()

G4Parton::~G4Parton

(

)

Definition at line 136 of file G4Parton.cc.

{
//  cout << "G4Parton::~G4Parton(): this = "<<this <<endl;
//  cout << "break here"<<this <<endl;
}

Member Function Documentation

DefineMomentumInZ() [1/2]

void G4Parton::DefineMomentumInZ	(	G4double	aLightConeMomentum,
		G4bool	aDirection
	)

Definition at line 142 of file G4Parton.cc.

{
    G4double Mass = GetMass();
    G4LorentzVector a4Momentum = Get4Momentum();
    aLightConeMomentum*=theX;
    G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass);
    a4Momentum.setPz(0.5*(aLightConeMomentum - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1)); 
    a4Momentum.setE( 0.5*(aLightConeMomentum + TransverseMass2/aLightConeMomentum));
    Set4Momentum(a4Momentum);
}  

DefineMomentumInZ() [2/2]

void G4Parton::DefineMomentumInZ	(	G4double	aLightConeMomentum,
		G4double	aLightConeE,
		G4bool	aDirection
	)

Definition at line 153 of file G4Parton.cc.

{
    G4double Mass = GetMass();
    G4LorentzVector a4Momentum = Get4Momentum();
    aLightConeMomentum*=theX;
    aLightConeE*=theX;
    G4double TransverseMass2 = sqr(a4Momentum.px()) + sqr(a4Momentum.py()) + sqr(Mass);
    a4Momentum.setPz(0.5*(aLightConeMomentum - aLightConeE - TransverseMass2/aLightConeMomentum)*(aDirection? 1: -1)); 
    a4Momentum.setE( 0.5*(aLightConeMomentum + aLightConeE + TransverseMass2/aLightConeMomentum));
    Set4Momentum(a4Momentum);
}  

Get4Momentum()

const G4LorentzVector & G4Parton::Get4Momentum ( ) const

inline

Definition at line 143 of file G4Parton.hh.

{
    return theMomentum;
}

Referenced by G4SoftStringBuilder::BuildString(), G4DiffractiveExcitation::CreateStrings(), DefineMomentumInZ(), G4QGSParticipants::DeterminePartonMomenta(), G4LundStringFragmentation::FragmentString(), G4QGSMFragmentation::FragmentString(), G4FragmentingString::G4FragmentingString(), G4PartonPair::G4PartonPair(), operator=(), G4QGSParticipants::PerformSoftCollisions(), and G4QGSDiffractiveExcitation::String().

GetColour()

G4int G4Parton::GetColour ( )

inline

Definition at line 90 of file G4Parton.hh.

{return theColour;}

Referenced by G4PartonPair::G4PartonPair().

GetDefinition()

G4ParticleDefinition * G4Parton::GetDefinition ( )

inline

Definition at line 161 of file G4Parton.hh.

{
    return theDefinition;
}

Referenced by G4DiffractiveExcitation::CreateStrings(), G4QGSParticipants::DeterminePartonMomenta(), G4QuarkExchange::ExciteParticipants(), G4FragmentingString::G4FragmentingString(), and G4PartonPair::G4PartonPair().

GetIsoSpinZ()

G4double G4Parton::GetIsoSpinZ ( )

inline

Definition at line 93 of file G4Parton.hh.

{return theIsoSpinZ;}

GetPDGcode()

G4int G4Parton::GetPDGcode ( ) const

inline

Definition at line 127 of file G4Parton.hh.

{
    return PDGencoding;
}

Referenced by G4SoftStringBuilder::BuildString(), G4DiffractiveExcitation::CreateStrings(), G4LundStringFragmentation::FragmentString(), G4QGSMFragmentation::FragmentString(), G4ExcitedString::GetAntiColorParton(), G4ExcitedString::GetColorParton(), operator=(), G4QGSParticipants::PerformSoftCollisions(), and G4QGSDiffractiveExcitation::String().

GetPosition()

const G4ThreeVector & G4Parton::GetPosition ( ) const

inline

Definition at line 132 of file G4Parton.hh.

{
    return thePosition;
}

Referenced by G4ExcitedString::G4ExcitedString(), and operator=().

GetSpinZ()

G4double G4Parton::GetSpinZ ( )

inline

Definition at line 96 of file G4Parton.hh.

{return theSpinZ;}

Referenced by G4PartonPair::G4PartonPair().

GetX()

G4double G4Parton::GetX ( )

inline

Definition at line 87 of file G4Parton.hh.

{return theX;}

Referenced by G4SoftStringBuilder::BuildString(), and G4QGSParticipants::PerformSoftCollisions().

operator!=()

G4bool G4Parton::operator!= ( const G4Parton &  right ) const

inline

Definition at line 122 of file G4Parton.hh.

{
    return this!=&right;
}

operator=()

G4Parton & G4Parton::operator=

(

const G4Parton &

right

)

Definition at line 119 of file G4Parton.cc.

{
   if (this != &right)
   {
      PDGencoding=right.GetPDGcode();
      theMomentum=right.Get4Momentum();
      thePosition=right.GetPosition();
      theX = right.theX;
      theDefinition = right.theDefinition;
      theColour = right.theColour;
      theIsoSpinZ = right.theIsoSpinZ;
      theSpinZ = right.theSpinZ;
   }
 
    return *this;
}

operator==()

G4bool G4Parton::operator== ( const G4Parton &  right ) const

inline

Definition at line 117 of file G4Parton.hh.

{
    return this==&right;
}   

Set4Momentum()

void G4Parton::Set4Momentum ( const G4LorentzVector &  aMomentum )

inline

Definition at line 148 of file G4Parton.hh.

{
    theMomentum=aMomentum;
}

Referenced by G4DiffractiveExcitation::CreateStrings(), DefineMomentumInZ(), G4QGSParticipants::DeterminePartonMomenta(), G4DiffractiveSplitableHadron::G4DiffractiveSplitableHadron(), G4DiffractiveSplitableHadron::SetFirstParton(), G4DiffractiveSplitableHadron::SetSecondParton(), G4DiffractiveSplitableHadron::SplitUp(), and G4QGSDiffractiveExcitation::String().

SetColour()

void G4Parton::SetColour ( G4int  aColour )

inline

Definition at line 89 of file G4Parton.hh.

{theColour = aColour;}

SetDefinition()

void G4Parton::SetDefinition ( G4ParticleDefinition *  aDefinition )

inline

Definition at line 166 of file G4Parton.hh.

{
    theDefinition = aDefinition;
    PDGencoding = theDefinition->GetPDGEncoding();
}

Referenced by G4QuarkExchange::ExciteParticipants().

SetIsoSpinZ()

void G4Parton::SetIsoSpinZ ( G4double  anIsoSpinZ )

inline

Definition at line 92 of file G4Parton.hh.

{theIsoSpinZ = anIsoSpinZ;}

SetPosition()

void G4Parton::SetPosition ( const G4ThreeVector &  aPosition )

inline

Definition at line 137 of file G4Parton.hh.

{
    thePosition=aPosition;
}

SetSpinZ()

void G4Parton::SetSpinZ ( G4double  aSpinZ )

inline

Definition at line 95 of file G4Parton.hh.

{theSpinZ = aSpinZ;}

SetX()

void G4Parton::SetX ( G4double  anX )

inline

Definition at line 86 of file G4Parton.hh.

{ theX = anX; }

Member Data Documentation

PDGencoding

G4int G4Parton::PDGencoding

Definition at line 102 of file G4Parton.hh.

Referenced by G4Parton(), GetPDGcode(), operator=(), and SetDefinition().

theDefinition

G4ParticleDefinition* G4Parton::theDefinition

Definition at line 103 of file G4Parton.hh.

Referenced by G4Parton(), GetDefinition(), operator=(), and SetDefinition().

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

• G4Parton.hh
• G4Parton.cc