G4FragmentingString.cc

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// ------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      ---------------- G4FragmentingString ----------------
//             by Gunter Folger, September 2001.
//       class for an excited string used in Fragmention
// ------------------------------------------------------------


// G4FragmentingString
#include "G4FragmentingString.hh"
#include "G4ExcitedString.hh"

//---------------------------------------------------------------------------------

//---------------------------------------------------------------------------------

G4FragmentingString::G4FragmentingString(const G4FragmentingString &old)
{
    LeftParton=old.LeftParton;
    RightParton=old.RightParton;
    Ptleft=old.Ptleft;
    Ptright=old.Ptright;
    Pplus=old.Pplus;
    Pminus=old.Pminus;
    theStableParton=old.theStableParton;
    theDecayParton=old.theDecayParton;
    decaying=old.decaying;
}

G4FragmentingString & G4FragmentingString::operator =(const G4FragmentingString &old)
{
   if (this != &old)
   {
   LeftParton=old.LeftParton;
   RightParton=old.RightParton;
   Ptleft=old.Ptleft;
   Ptright=old.Ptright;
   Pplus=old.Pplus;
   Pminus=old.Pminus;
   theStableParton=old.theStableParton;
   theDecayParton=old.theDecayParton;
   decaying=old.decaying;
   }
   return *this;
}

//---------------------------------------------------------------------------------

G4FragmentingString::G4FragmentingString(const G4ExcitedString &excited)
{
    LeftParton=excited.GetLeftParton()->GetDefinition();
    RightParton=excited.GetRightParton()->GetDefinition();
    Ptleft=excited.GetLeftParton()->Get4Momentum().vect();
    Ptleft.setZ(0.);
    Ptright=excited.GetRightParton()->Get4Momentum().vect();
    Ptright.setZ(0.);
    G4LorentzVector P=excited.Get4Momentum();
    Pplus =P.e() + P.pz();
    Pminus=P.e() - P.pz();
    theStableParton=0;
    theDecayParton=0;
    decaying=None;
}

//---------------------------------------------------------------------------------

G4FragmentingString::G4FragmentingString(const G4FragmentingString &old,
                     G4ParticleDefinition * newdecay,
                     const G4LorentzVector *momentum)
{
    decaying=None;
    if ( old.decaying == Left )
    {
        RightParton= old.RightParton;
        Ptright    = old.Ptright;
        LeftParton = newdecay;
        Ptleft     = old.Ptleft - momentum->vect();
        Ptleft.setZ(0.);
        theDecayParton=GetLeftParton();
        theStableParton=GetRightParton();
    } else if ( old.decaying == Right )
    {
        RightParton = newdecay;
        Ptright     = old.Ptright - momentum->vect();
        Ptright.setZ(0.);
        LeftParton  = old.LeftParton;
        Ptleft      = old.Ptleft;
        theDecayParton=GetRightParton();
        theStableParton=GetLeftParton();
    } else
    {
        throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::G4FragmentingString: no decay Direction defined");
    }
    Pplus  = old.Pplus  - (momentum->e() + momentum->pz());
    Pminus = old.Pminus - (momentum->e() - momentum->pz());
    
    //G4double Eold=0.5 * (old.Pplus + old.Pminus);
    //G4double Enew=0.5 * (Pplus + Pminus);
}


//---------------------------------------------------------------------------------

G4FragmentingString::G4FragmentingString(const G4FragmentingString &old,  
                     G4ParticleDefinition * newdecay) 
{                                                                         
    decaying=None;                                                    

        Ptleft.setX(0.);  Ptleft.setY(0.);  Ptleft.setZ(0.);  // Uzhi 25.02.2011
        Ptright.setX(0.); Ptright.setY(0.); Ptright.setZ(0.); // Uzhi 25.02.2011
        Pplus=0.; Pminus=0.;                                  // Uzhi 25.02.2011
        theStableParton=0; theDecayParton=0;                  // Uzhi 25.02.2011

    if ( old.decaying == Left )                                       
    {                                                                 
        RightParton= old.RightParton;                             
        LeftParton = newdecay;                                    
    } else if ( old.decaying == Right )                               
    {                                                                 
        RightParton = newdecay;                                   
        LeftParton  = old.LeftParton;                             
    } else                                                            
    {
        throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::G4FragmentingString: no decay Direction defined");
    }
}


//---------------------------------------------------------------------------------

G4FragmentingString::~G4FragmentingString()
{}


//---------------------------------------------------------------------------------

void G4FragmentingString::SetLeftPartonStable()
{
     theStableParton=GetLeftParton();
     theDecayParton=GetRightParton();
     decaying=Right;
}

//---------------------------------------------------------------------------------

void G4FragmentingString::SetRightPartonStable()
{
     theStableParton=GetRightParton();
     theDecayParton=GetLeftParton();
     decaying=Left;
}

//---------------------------------------------------------------------------------

G4int G4FragmentingString::GetDecayDirection() const
{
    if      (decaying == Left ) return +1;
    else if (decaying == Right) return -1;
    else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::GetDecayDirection: decay side UNdefined!");
    return 0;
}
 
//---------------------------------------------------------------------------------

G4bool G4FragmentingString::FourQuarkString() const
{
    return   LeftParton->GetParticleSubType()== "di_quark" 
         && RightParton->GetParticleSubType()== "di_quark";
}

//---------------------------------------------------------------------------------

G4bool G4FragmentingString::DecayIsQuark()
{
    return theDecayParton->GetParticleSubType()== "quark";
}

G4bool G4FragmentingString::StableIsQuark()
{
    return theStableParton->GetParticleSubType()== "quark";
}

//---------------------------------------------------------------------------------

G4ThreeVector G4FragmentingString::StablePt()
{
    if (decaying == Left ) return Ptright;
    else if (decaying == Right ) return Ptleft;
    else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::DecayPt: decay side UNdefined!");
    return G4ThreeVector();
}

G4ThreeVector G4FragmentingString::DecayPt()
{
    if (decaying == Left ) return Ptleft;
    else if (decaying == Right ) return Ptright;
    else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::DecayPt: decay side UNdefined!");
    return G4ThreeVector();
}

//---------------------------------------------------------------------------------

G4double G4FragmentingString::LightConePlus()
{
    return Pplus;
}

G4double G4FragmentingString::LightConeMinus()
{
    return Pminus;
}

G4double G4FragmentingString::LightConeDecay()
{
    if (decaying == Left ) return Pplus;
    else if (decaying == Right ) return Pminus;
    else throw G4HadronicException(__FILE__, __LINE__, "G4FragmentingString::DecayPt: decay side UNdefined!");
    return 0;
}

//---------------------------------------------------------------------------------

G4LorentzVector G4FragmentingString::Get4Momentum() const
{
        G4LorentzVector momentum(Ptleft+Ptright,0);
    momentum.setPz(0.5*(Pplus-Pminus));
    momentum.setE(0.5*(Pplus+Pminus));
    return momentum;
}

G4double G4FragmentingString::Mass2() const
{
    return Pplus*Pminus - (Ptleft+Ptright).mag2();
}

G4double G4FragmentingString::Mass() const
{
    return std::sqrt(this->Mass2());
}

G4double G4FragmentingString::MassT2() const
{
    return Pplus*Pminus;
}