G4QGSMFragmentation Class Reference

#include <G4QGSMFragmentation.hh>

Inheritance diagram for G4QGSMFragmentation:

Collaboration diagram for G4QGSMFragmentation:

Public Member Functions
	G4QGSMFragmentation ()
	~G4QGSMFragmentation ()
virtual G4KineticTrackVector *	FragmentString (const G4ExcitedString &theString)
Public Member Functions inherited from G4VLongitudinalStringDecay
	G4VLongitudinalStringDecay ()
virtual	~G4VLongitudinalStringDecay ()
G4int	SampleQuarkFlavor (void)
G4ThreeVector	SampleQuarkPt (G4double ptMax=-1.)
G4KineticTrackVector *	DecayResonans (G4KineticTrackVector *aHadrons)
void	SetSigmaTransverseMomentum (G4double aQT)
void	SetStrangenessSuppression (G4double aValue)
void	SetDiquarkSuppression (G4double aValue)
void	SetDiquarkBreakProbability (G4double aValue)
void	SetVectorMesonProbability (G4double aValue)
void	SetSpinThreeHalfBarionProbability (G4double aValue)
void	SetScalarMesonMixings (std::vector< G4double > aVector)
void	SetVectorMesonMixings (std::vector< G4double > aVector)
void	SetStringTensionParameter (G4double aValue)

Additional Inherited Members
Protected Types inherited from G4VLongitudinalStringDecay
typedef std::pair < G4ParticleDefinition *, G4ParticleDefinition * >	pDefPair
typedef G4ParticleDefinition *(G4HadronBuilder::*	Pcreate )(G4ParticleDefinition *, G4ParticleDefinition *)
Protected Member Functions inherited from G4VLongitudinalStringDecay
virtual void	SetMassCut (G4double aValue)
G4KineticTrackVector *	LightFragmentationTest (const G4ExcitedString *const theString)
G4double	FragmentationMass (const G4FragmentingString *const string, Pcreate build=0, pDefPair *pdefs=0)
G4ParticleDefinition *	FindParticle (G4int Encoding)
G4ExcitedString *	CPExcited (const G4ExcitedString &string)
G4KineticTrack *	Splitup (G4FragmentingString *string, G4FragmentingString *&newString)
G4ParticleDefinition *	QuarkSplitup (G4ParticleDefinition *decay, G4ParticleDefinition *&created)
pDefPair	CreatePartonPair (G4int NeedParticle, G4bool AllowDiquarks=true)
void	CalculateHadronTimePosition (G4double theInitialStringMass, G4KineticTrackVector *)
void	ConstructParticle ()
G4ParticleDefinition *	CreateHadron (G4int id1, G4int id2, G4bool theGivenSpin, G4int theSpin)
G4double	GetDiquarkSuppress ()
G4double	GetDiquarkBreakProb ()
G4double	GetStrangeSuppress ()
G4double	GetClusterMass ()
G4int	GetClusterLoopInterrupt ()
G4double	GetStringTensionParameter ()
Protected Attributes inherited from G4VLongitudinalStringDecay
G4double	MassCut
G4double	ClusterMass
G4double	SigmaQT
G4double	DiquarkSuppress
G4double	DiquarkBreakProb
G4double	SmoothParam
G4double	StrangeSuppress
G4int	StringLoopInterrupt
G4int	ClusterLoopInterrupt
G4HadronBuilder *	hadronizer
G4double	pspin_meson
G4double	pspin_barion
std::vector< G4double >	vectorMesonMix
std::vector< G4double >	scalarMesonMix
G4bool	PastInitPhase
G4double	Kappa

Detailed Description

Definition at line 40 of file G4QGSMFragmentation.hh.

Constructor & Destructor Documentation

G4QGSMFragmentation::G4QGSMFragmentation

(

)

Definition at line 49 of file G4QGSMFragmentation.cc.

                                         :
arho(0.5), aphi(0.), an(-0.5), ala(-0.75), aksi(-1.), alft(0.5)
{
  SetStrangenessSuppression(0.41);
  SetDiquarkSuppression(0.25);
  SetDiquarkBreakProbability(0.4);
}

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G4QGSMFragmentation::~G4QGSMFragmentation

(

)

Definition at line 57 of file G4QGSMFragmentation.cc.

{
}

Member Function Documentation

G4KineticTrackVector * G4QGSMFragmentation::FragmentString ( const G4ExcitedString &  theString )

virtual

Implements G4VLongitudinalStringDecay.

Definition at line 63 of file G4QGSMFragmentation.cc.

{
  #ifdef debug_QGSMfragmentation
  G4cout<<G4endl<<"QGSM StringFragm: String Mass " <<theString.Get4Momentum().mag()<<" Pz "
                                                   <<theString.Get4Momentum().pz()
        <<"------------------------------------"<<G4endl;
  G4cout<<"String ends Direct "<<theString.GetLeftParton()->GetPDGcode()<<" "
                               <<theString.GetRightParton()->GetPDGcode()<<" "
                               <<theString.GetDirection()<< G4endl;
  G4cout<<"Left  mom "<<theString.GetLeftParton()->Get4Momentum()<<G4endl;
  G4cout<<"Right mom "<<theString.GetRightParton()->Get4Momentum()<<G4endl;
  G4cout<<"Check for Fragmentation "<<G4endl;
  #endif

  // Can no longer modify Parameters for Fragmentation.
  PastInitPhase=true;
    
  // check if string has enough mass to fragment...

  G4KineticTrackVector * LeftVector=LightFragmentationTest(&theString);

  #ifdef debug_QGSMfragmentation
  if ( LeftVector != 0 ) G4cout<<"Non fragmentable - the string is converted to one hadron "<<G4endl;
  #endif

  if ( LeftVector != 0 ) return LeftVector;

  #ifdef debug_QGSMfragmentation
  G4cout<<"The string will be fragmented. "<<G4endl;
  #endif
    
  LeftVector = new G4KineticTrackVector;
  G4KineticTrackVector * RightVector=new G4KineticTrackVector;

  // this should work but its only a semi deep copy. %GF    G4ExcitedString theStringInCMS(theString);
  G4ExcitedString *theStringInCMS=CPExcited(theString);
  G4LorentzRotation toCms=theStringInCMS->TransformToAlignedCms();

  G4bool success=false, inner_sucess=true;
  G4int attempt=0;
  while ( !success && attempt++ < StringLoopInterrupt )  /* Loop checking, 07.08.2015, A.Ribon */
  {
    #ifdef debug_QGSMfragmentation
    G4cout<<"Loop_toFrag "<<theStringInCMS->GetLeftParton()->GetPDGcode()<<" "
                          <<theStringInCMS->GetRightParton()->GetPDGcode()<<" "
                          <<theStringInCMS->GetDirection()<< G4endl;
    #endif

    G4FragmentingString *currentString=new G4FragmentingString(*theStringInCMS);

    std::for_each(LeftVector->begin(), LeftVector->end(), DeleteKineticTrack());
    LeftVector->clear();
    std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack());
    RightVector->clear();
        
    inner_sucess=true;  // set false on failure..
    const G4int maxNumberOfLoops = 1000;
    G4int loopCounter = -1;
    while (! StopFragmenting(currentString) && ++loopCounter < maxNumberOfLoops )   /* Loop checking, 07.08.2015, A.Ribon */
    {  // Split current string into hadron + new string

      #ifdef debug_QGSMfragmentation
      G4cout<<"The string can fragment. "<<G4endl;;
      #endif

      G4FragmentingString *newString=0;  // used as output from SplitUp...
      G4KineticTrack * Hadron=Splitup(currentString,newString);

      if ( Hadron != 0 ) // && IsFragmentable(newString))
      {
        #ifdef debug_QGSMfragmentation
        G4cout<<"Hadron prod at fragm. "<<Hadron->GetDefinition()->GetParticleName()<<G4endl;
        #endif

        if ( currentString->GetDecayDirection() > 0 ) LeftVector->push_back(Hadron);
        else                                          RightVector->push_back(Hadron);

    delete currentString;
    currentString=newString;

      } else {

        #ifdef debug_QGSMfragmentation
        G4cout<<"abandon ... start from the beginning ---------------"<<G4endl;
        #endif

    // abandon ... start from the beginning
    if (newString) delete newString;
    inner_sucess=false;
    break;
      }
    }
    if ( loopCounter >= maxNumberOfLoops ) inner_sucess=false;
              
    // Split current string into 2 final Hadrons
    #ifdef debug_QGSMfragmentation
    G4cout<<"Split remaining string into 2 final hadrons."<<G4endl;
    #endif

    if ( inner_sucess && SplitLast(currentString,LeftVector, RightVector) ) 
    {
      success=true;
    }
    delete currentString;
  } // End of while loop
    
  delete theStringInCMS;
    
  if ( ! success )
  {
    std::for_each(LeftVector->begin(), LeftVector->end(), DeleteKineticTrack());
    LeftVector->clear();
    std::for_each(RightVector->begin(), RightVector->end(), DeleteKineticTrack());
    delete RightVector;
    return LeftVector;
  }
        
  // Join Left- and RightVector into LeftVector in correct order.
  while(!RightVector->empty())  /* Loop checking, 07.08.2015, A.Ribon */
  {
    LeftVector->push_back(RightVector->back());
    RightVector->erase(RightVector->end()-1);
  }
  delete RightVector;

  CalculateHadronTimePosition(theString.Get4Momentum().mag(), LeftVector);

  G4LorentzRotation toObserverFrame(toCms.inverse());

  for(size_t C1 = 0; C1 < LeftVector->size(); C1++)
  {
    G4KineticTrack* Hadron = LeftVector->operator[](C1);
    G4LorentzVector Momentum = Hadron->Get4Momentum();
    Momentum = toObserverFrame*Momentum;
    Hadron->Set4Momentum(Momentum);
    G4LorentzVector Coordinate(Hadron->GetPosition(), Hadron->GetFormationTime());
    Momentum = toObserverFrame*Coordinate;
    Hadron->SetFormationTime(Momentum.e());
    G4ThreeVector aPosition(Momentum.vect());
    Hadron->SetPosition(theString.GetPosition()+aPosition);
   }
   return LeftVector;
}

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---

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

• source/geant4.10.03.p03/source/processes/hadronic/models/parton_string/hadronization/include/G4QGSMFragmentation.hh
• source/geant4.10.03.p03/source/processes/hadronic/models/parton_string/hadronization/src/G4QGSMFragmentation.cc