G4ExcitedStringDecay Class Reference

#include <G4ExcitedStringDecay.hh>

Inheritance diagram for G4ExcitedStringDecay:

Collaboration diagram for G4ExcitedStringDecay:

Public Member Functions
	G4ExcitedStringDecay ()
	G4ExcitedStringDecay (G4VLongitudinalStringDecay *aStringDecay)
virtual	~G4ExcitedStringDecay ()
virtual G4KineticTrackVector *	FragmentStrings (const G4ExcitedStringVector *theStrings)
Public Member Functions inherited from G4VStringFragmentation
	G4VStringFragmentation ()
virtual	~G4VStringFragmentation ()

Private Member Functions
	G4ExcitedStringDecay (const G4ExcitedStringDecay &right)
const G4ExcitedStringDecay &	operator= (const G4ExcitedStringDecay &right)
int	operator== (const G4ExcitedStringDecay &right) const
int	operator!= (const G4ExcitedStringDecay &right) const
G4KineticTrackVector *	FragmentString (const G4ExcitedString &theString)
G4bool	EnergyAndMomentumCorrector (G4KineticTrackVector *Output, G4LorentzVector &TotalCollisionMom)

Private Attributes
G4VLongitudinalStringDecay *	theStringDecay

Detailed Description

Definition at line 38 of file G4ExcitedStringDecay.hh.

Constructor & Destructor Documentation

G4ExcitedStringDecay() [1/3]

G4ExcitedStringDecay::G4ExcitedStringDecay

(

)

Definition at line 35 of file G4ExcitedStringDecay.cc.

                                           : G4VStringFragmentation(),theStringDecay(0)
{}

G4ExcitedStringDecay() [2/3]

G4ExcitedStringDecay::G4ExcitedStringDecay

(

G4VLongitudinalStringDecay *

aStringDecay

)

Definition at line 38 of file G4ExcitedStringDecay.cc.

: G4VStringFragmentation(),
  theStringDecay(aStringDecay)
{}

~G4ExcitedStringDecay()

G4ExcitedStringDecay::~G4ExcitedStringDecay ( )

virtual

Definition at line 50 of file G4ExcitedStringDecay.cc.

{
}

G4ExcitedStringDecay() [3/3]

G4ExcitedStringDecay::G4ExcitedStringDecay ( const G4ExcitedStringDecay &  right )

private

Definition at line 43 of file G4ExcitedStringDecay.cc.

: G4VStringFragmentation(),
  theStringDecay(0)
{
  throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::copy ctor not accessible");
} 

Member Function Documentation

EnergyAndMomentumCorrector()

G4bool G4ExcitedStringDecay::EnergyAndMomentumCorrector ( G4KineticTrackVector *  Output, G4LorentzVector &  TotalCollisionMom  )

private

Definition at line 273 of file G4ExcitedStringDecay.cc.

  {
    const int    nAttemptScale = 500;
    const double ErrLimit = 1.E-5;
    if (Output->empty()) return TRUE;
    G4LorentzVector SumMom;
    G4double        SumMass = 0;
    G4double        TotalCollisionMass = TotalCollisionMom.m();

#ifdef debug_G4ExcitedStringCorr
    G4cout<<G4endl<<"EnergyAndMomentumCorrector. Number of particles: "<<Output->size()<<G4endl;
#endif
    // Calculate sum hadron 4-momenta and summing hadron mass
    unsigned int cHadron;
    for(cHadron = 0; cHadron < Output->size(); cHadron++)
    {
        SumMom  += Output->operator[](cHadron)->Get4Momentum();
        SumMass += Output->operator[](cHadron)->GetDefinition()->GetPDGMass();
    }

#ifdef debug_G4ExcitedStringCorr
   G4cout<<"Sum part mom "<<SumMom<<" "<<SumMom.mag()<<G4endl
         <<"Sum str  mom "<<TotalCollisionMom<<" "<<TotalCollisionMom.mag()<<G4endl;
   G4cout<<"SumMass TotalCollisionMass "<<SumMass<<" "<<TotalCollisionMass<<G4endl;
#endif

    // Cannot correct a single particle
    if (Output->size() < 2) return FALSE;

    if (SumMass > TotalCollisionMass) return FALSE;
    SumMass = SumMom.m2();
    if (SumMass < 0) return FALSE;
    SumMass = std::sqrt(SumMass);

     // Compute c.m.s. hadron velocity and boost KTV to hadron c.m.s.
//    G4ThreeVector Beta = -SumMom.boostVector();          // Uzhi 22 June 2014
    G4ThreeVector Beta = -TotalCollisionMom.boostVector(); // Uzhi 22 June 2014
    Output->Boost(Beta);

    // Scale total c.m.s. hadron energy (hadron system mass).
    // It should be equal interaction mass
    G4double Scale = 1;
    G4int cAttempt = 0;
    G4double Sum = 0;
    G4bool success = false;
    for(cAttempt = 0; cAttempt < nAttemptScale; cAttempt++)
    {
      Sum = 0;
      for(cHadron = 0; cHadron < Output->size(); cHadron++)
      {
        G4LorentzVector HadronMom = Output->operator[](cHadron)->Get4Momentum();
        HadronMom.setVect(Scale*HadronMom.vect());
        G4double E = std::sqrt(HadronMom.vect().mag2() + sqr(Output->operator[](cHadron)->GetDefinition()->GetPDGMass()));
        HadronMom.setE(E);
        Output->operator[](cHadron)->Set4Momentum(HadronMom);
        Sum += E;
      } 
      Scale = TotalCollisionMass/Sum;    
#ifdef debug_G4ExcitedStringCorr
      G4cout << "Scale-1=" << Scale -1 
                << ",  TotalCollisionMass=" << TotalCollisionMass
        << ",  Sum=" << Sum
        << G4endl;
#endif     
      if (std::fabs(Scale - 1) <= ErrLimit) 
      {
        success = true;
    break;
      }
    }
#ifdef debug_G4ExcitedStringCorr
    if(!success)
    {
      G4cout << "G4ExcitedStringDecay::EnergyAndMomentumCorrector - Warning"<<G4endl;
      G4cout << "   Scale not unity at end of iteration loop: "<<TotalCollisionMass<<" "<<Sum<<" "<<Scale<<G4endl;
      G4cout << "   Number of secondaries: " << Output->size() << G4endl;
      G4cout << "   Wanted total energy: " <<  TotalCollisionMom.e() << G4endl; 
      G4cout << "   Increase number of attempts or increase ERRLIMIT"<<G4endl;
//       throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay failed to correct...");
    }
#endif     
    // Compute c.m.s. interaction velocity and KTV back boost   
    Beta = TotalCollisionMom.boostVector();
    Output->Boost(Beta);

    return success;
  }

Here is the call graph for this function:

Here is the caller graph for this function:

FragmentString()

G4KineticTrackVector * G4ExcitedStringDecay::FragmentString ( const G4ExcitedString &  theString )

private

Definition at line 70 of file G4ExcitedStringDecay.cc.

{
 if ( theStringDecay == NULL ) theStringDecay=new G4LundStringFragmentation();
 return theStringDecay->FragmentString(theString);
}

Here is the call graph for this function:

Here is the caller graph for this function:

FragmentStrings()

G4KineticTrackVector * G4ExcitedStringDecay::FragmentStrings ( const G4ExcitedStringVector *  theStrings )

virtual

Implements G4VStringFragmentation.

Definition at line 76 of file G4ExcitedStringDecay.cc.

{
  G4LorentzVector KTsum(0.,0.,0.,0.);

#ifdef debug_G4ExcitedStringDecay
  G4cout<<G4endl;
  G4cout<<"--------------------------- G4ExcitedStringDecay ----------------------"<<G4endl;
  G4cout<<"Hadronization of Excited Strings: theStrings->size() "<<theStrings->size()<<G4endl;
#endif

  for ( unsigned int astring=0; astring < theStrings->size(); astring++)
  {
   if ( theStrings->operator[](astring)->IsExcited() )
        {KTsum+= theStrings->operator[](astring)->Get4Momentum();}
   else {KTsum+=theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();}
  }

  G4LorentzRotation toCms( -1 * KTsum.boostVector() );                   // Uzhi 22 June 2014
  G4LorentzRotation toLab(toCms.inverse());                              // Uzhi 22 June 2014
  G4LorentzVector Ptmp;
  KTsum=G4LorentzVector(0.,0.,0.,0.);
  for ( unsigned int astring=0; astring < theStrings->size(); astring++) // Uzhi 22 June 2014
  {
   if ( theStrings->operator[](astring)->IsExcited() )
   {
    Ptmp=toCms * theStrings->operator[](astring)->GetLeftParton()->Get4Momentum();
    theStrings->operator[](astring)->GetLeftParton()->Set4Momentum(Ptmp);

    Ptmp=toCms * theStrings->operator[](astring)->GetRightParton()->Get4Momentum();
    theStrings->operator[](astring)->GetRightParton()->Set4Momentum(Ptmp);

    KTsum+= theStrings->operator[](astring)->Get4Momentum();
   }
   else
   {
    Ptmp=toCms * theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
    theStrings->operator[](astring)->GetKineticTrack()->Set4Momentum(Ptmp);
    KTsum+= theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
   }
  }                                                                      // Uzhi 22 June 2014

  G4KineticTrackVector * theResult = new G4KineticTrackVector;
  G4int attempts(0);
  G4bool success=false;
  G4bool NeedEnergyCorrector=false;
  do {
#ifdef debug_G4ExcitedStringDecay  
        G4cout<<"New try No "<<attempts<<" to hadronize strings"<<G4endl;
#endif

    std::for_each(theResult->begin() , theResult->end() , DeleteKineticTrack());
    theResult->clear();

    attempts++;

    G4LorentzVector KTsecondaries(0.,0.,0.,0.);
    NeedEnergyCorrector=false;

    for ( unsigned int astring=0; astring < theStrings->size(); astring++)
//  for ( unsigned int astring=0; astring < 1; astring++)
    {
#ifdef debug_G4ExcitedStringDecay  
          G4cout<<"String No "<<astring+1<<" Excited?  "<<theStrings->operator[](astring)->IsExcited()<<G4endl;

          G4cout<<"String No "<<astring+1<<" 4Momentum "<<theStrings->operator[](astring)->Get4Momentum()
          <<" "<<theStrings->operator[](astring)->Get4Momentum().mag()<<G4endl;
#endif

          G4KineticTrackVector * generatedKineticTracks = NULL;
      if ( theStrings->operator[](astring)->IsExcited() )
      {
#ifdef debug_G4ExcitedStringDecay  
             G4cout<<"Fragment String with partons: "
                   <<theStrings->operator[](astring)->GetLeftParton()->GetPDGcode() <<" "
                   <<theStrings->operator[](astring)->GetRightParton()->GetPDGcode()<<" "
                   <<"Direction "<<theStrings->operator[](astring)->GetDirection()<<G4endl;
#endif
         generatedKineticTracks=FragmentString(*theStrings->operator[](astring));
#ifdef debug_G4ExcitedStringDecay  
            G4cout<<"(G4ExcitedStringDecay) Number of produced hadrons = "<<generatedKineticTracks->size()<<G4endl;
#endif
      } else {
#ifdef debug_G4ExcitedStringDecay  
              G4cout<<"   GetTrack from the String"<<G4endl;
#endif
             G4LorentzVector Mom=theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
             G4KineticTrack * aTrack= new G4KineticTrack(
                            theStrings->operator[](astring)->GetKineticTrack()->GetDefinition(),
                            theStrings->operator[](astring)->GetKineticTrack()->GetFormationTime(),
                            G4ThreeVector(0), Mom);

             aTrack->SetPosition(theStrings->operator[](astring)->GetKineticTrack()->GetPosition());

#ifdef debug_G4ExcitedStringDecay  
             G4cout<<"   A particle stored in the track is "<<aTrack->GetDefinition()->GetParticleName()<<G4endl;
#endif

         generatedKineticTracks = new G4KineticTrackVector;
         generatedKineticTracks->push_back(aTrack);
      }    

//    if (generatedKineticTracks == NULL)                // Uzhi 02.06.2015
      if (generatedKineticTracks->size() == 0)           // Uzhi 02.06.2015
      {
//       G4cerr << "G4VPartonStringModel:No KineticTracks produced" << G4endl; // Uzhi 02.06.2015
//       continue;                                                             // Uzhi 02.06.2015
             success=false; NeedEnergyCorrector=false; break;                      // Uzhi 02.06.2015
      }

          G4LorentzVector KTsum1(0.,0.,0.,0.);
          for ( unsigned int aTrack=0; aTrack<generatedKineticTracks->size();aTrack++)
      {
#ifdef debug_G4ExcitedStringDecay  
             G4cout<<"Prod part No. "<<aTrack+1<<" "
                   <<(*generatedKineticTracks)[aTrack]->GetDefinition()->GetParticleName()<<" "
                   <<(*generatedKineticTracks)[aTrack]->Get4Momentum()<<G4endl;
#endif
             theResult->push_back(generatedKineticTracks->operator[](aTrack));
             KTsum1+= (*generatedKineticTracks)[aTrack]->Get4Momentum();
      }
      KTsecondaries+=KTsum1;
    
#ifdef debug_G4ExcitedStringDecay  
          G4cout << "String secondaries(" <<generatedKineticTracks->size()<< ")"<<G4endl
                 <<"Init  string  momentum: "<< theStrings->operator[](astring)->Get4Momentum()<<G4endl
                 <<"Final hadrons momentum: "<< KTsum1 << G4endl;
#endif

      if  ( KTsum1.e() > 0 && std::abs((KTsum1.e()-theStrings->operator[](astring)->Get4Momentum().e()) / KTsum1.e()) > perMillion )
      {
        NeedEnergyCorrector=true;
      }

#ifdef debug_G4ExcitedStringDecay  
          G4cout<<"NeedEnergyCorrection yes/no "<<NeedEnergyCorrector<<G4endl;
#endif

//        clean up
      delete generatedKineticTracks;
      success=true;                          // Uzhi 02.06.2015
    }

//        success=true;                          // Uzhi 02.06.2015

    if ( NeedEnergyCorrector ) success=EnergyAndMomentumCorrector(theResult, KTsum);
  } while(!success && (attempts < 10));  /* Loop checking, 07.08.2015, A.Ribon */

  for ( unsigned int aTrack=0; aTrack<theResult->size();aTrack++)       // Uzhi 22 June 2014
  {
   Ptmp=(*theResult)[aTrack]->Get4Momentum();
   Ptmp.transform( toLab);
   (*theResult)[aTrack]->Set4Momentum(Ptmp);
  }                                                                    // Uzhi 22 June 2014

#ifdef debug_G4ExcitedStringDecay  
  G4cout<<"End of the strings fragmentation (G4ExcitedStringDecay)"<<G4endl;

  G4LorentzVector  KTsum1(0.,0.,0.,0.); 

  for ( unsigned int aTrack=0; aTrack<theResult->size();aTrack++)
  {
      G4cout << " corrected tracks .. " << (*theResult)[aTrack]->GetDefinition()->GetParticleName()
      <<"  " << (*theResult)[aTrack]->Get4Momentum() 
      <<"  " << (*theResult)[aTrack]->Get4Momentum().mag()<< G4endl;
      KTsum1+= (*theResult)[aTrack]->Get4Momentum();
  }

  G4cout << "Needcorrector/success " << NeedEnergyCorrector << "/" << success << ", Corrected total  4 momentum " << KTsum1  << G4endl;
  if ( ! success ) G4cout << "failed to correct E/p" << G4endl;  

  G4cout<<"End of the Hadronization (G4ExcitedStringDecay)"<<G4endl;
#endif

  for ( unsigned int astring=0; astring < theStrings->size(); astring++) // Uzhi 24 Oct. 2014
  {
   if ( theStrings->operator[](astring)->IsExcited() )
   {
    Ptmp=theStrings->operator[](astring)->GetLeftParton()->Get4Momentum();
    Ptmp.transform( toLab);
    theStrings->operator[](astring)->GetLeftParton()->Set4Momentum(Ptmp);

    Ptmp=theStrings->operator[](astring)->GetRightParton()->Get4Momentum();
    Ptmp.transform( toLab);
    theStrings->operator[](astring)->GetRightParton()->Set4Momentum(Ptmp);
   }
   else
   {
    Ptmp=theStrings->operator[](astring)->GetKineticTrack()->Get4Momentum();
    Ptmp.transform( toLab);
    theStrings->operator[](astring)->GetKineticTrack()->Set4Momentum(Ptmp);
   }
  }                                                                      // Uzhi 24 Oct. 2014

  return theResult;
}

Here is the call graph for this function:

operator!=()

int G4ExcitedStringDecay::operator!= ( const G4ExcitedStringDecay &  right ) const

private

Definition at line 65 of file G4ExcitedStringDecay.cc.

{
  return 1;
}

operator=()

const G4ExcitedStringDecay & G4ExcitedStringDecay::operator= ( const G4ExcitedStringDecay &  right )

private

Definition at line 54 of file G4ExcitedStringDecay.cc.

{
  throw G4HadronicException(__FILE__, __LINE__, "G4ExcitedStringDecay::operator= meant to not be accessable");
  return *this;
}

operator==()

int G4ExcitedStringDecay::operator== ( const G4ExcitedStringDecay &  right ) const

private

Definition at line 60 of file G4ExcitedStringDecay.cc.

{
  return 0;
}

Member Data Documentation

theStringDecay

G4VLongitudinalStringDecay* G4ExcitedStringDecay::theStringDecay

private

Definition at line 59 of file G4ExcitedStringDecay.hh.

---

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

• G4ExcitedStringDecay.hh
• G4ExcitedStringDecay.cc