source: trunk/source/processes/hadronic/models/parton_string/hadronization/src/G4FragmentingString.cc@ 880

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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;
        decaying=old.decaying;
}

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

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();
        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.);
        } else if ( old.decaying == Right )
        {
                RightParton = newdecay;
                Ptright     = old.Ptright - momentum->vect();
                Ptright.setZ(0.);
                LeftParton  = old.LeftParton;
                Ptleft      = old.Ptleft;
        } 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()
{}


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

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());
}