G4VLongitudinalStringDecay.hh

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// $Id: G4VLongitudinalStringDecay.hh 100828 2016-11-02 15:25:59Z gcosmo $
// Maxim Komogorov
//
// -----------------------------------------------------------------------------
//      GEANT 4 class implementation file
//
//      History: first implementation, Maxim Komogorov, 1-Jul-1998
// -----------------------------------------------------------------------------
#ifndef G4VLongitudinalStringDecay_h
#define G4VLongitudinalStringDecay_h 1
#include "G4VStringFragmentation.hh"
#include "G4DynamicParticle.hh"
#include "G4KineticTrack.hh"
#include "G4KineticTrackVector.hh"
#include "G4HadronBuilder.hh"

class G4FragmentingString;


class G4VLongitudinalStringDecay 
{
  public:
    G4VLongitudinalStringDecay();     
    virtual ~G4VLongitudinalStringDecay();

  private:
    // not implemented to protect/forbid use
    G4VLongitudinalStringDecay(const G4VLongitudinalStringDecay &right);
    const G4VLongitudinalStringDecay & operator=(const G4VLongitudinalStringDecay &right);
    int operator==(const G4VLongitudinalStringDecay &right) const;
    int operator!=(const G4VLongitudinalStringDecay &right) const;

  public:
    virtual G4KineticTrackVector* FragmentString(const G4ExcitedString& theString)=0;

  protected: 

    // For changing Mass Cut used for selection of very small mass strings
    virtual void SetMassCut(G4double aValue);

    // For handling a string with very low mass
    G4KineticTrackVector * LightFragmentationTest(const G4ExcitedString * const theString);

    // To store created quarks or 2 last hadrons
    typedef std::pair<G4ParticleDefinition*, G4ParticleDefinition*> pDefPair;

    // For creation of hadrons from given quark pair 
    typedef G4ParticleDefinition * (G4HadronBuilder::*Pcreate)
                    (G4ParticleDefinition*, G4ParticleDefinition*);

    // Used by LightFragmentationTest for estimation of lowest possible mass of
    // given quark system
    G4double FragmentationMass(const G4FragmentingString * const string,
                       Pcreate build=0, pDefPair * pdefs=0);

    G4ParticleDefinition* FindParticle(G4int Encoding); 

    virtual void Sample4Momentum(G4LorentzVector* Mom,     G4double Mass, 
                                 G4LorentzVector* AntiMom, G4double AntiMass, 
                                 G4double InitialMass)=0; 

    // For decision on continue or stop string fragmentation
    virtual G4bool StopFragmenting(const G4FragmentingString  * const string)=0;
    virtual G4bool IsFragmentable(const G4FragmentingString * const string)=0;

    // If a string can not fragment, make last break into 2 hadrons
    virtual G4bool SplitLast(G4FragmentingString * string, 
                     G4KineticTrackVector * LeftVector,
                     G4KineticTrackVector * RightVector)=0;

    // If a string fragments, do the following

    // For transver of a string to its CMS frame
    G4ExcitedString *CPExcited(const G4ExcitedString& string);

    G4KineticTrack * Splitup(G4FragmentingString *string, 
                             G4FragmentingString *&newString);

    G4ParticleDefinition * QuarkSplitup(G4ParticleDefinition* decay,
                        G4ParticleDefinition *&created);

    virtual G4ParticleDefinition * DiQuarkSplitup(G4ParticleDefinition* decay,
                              G4ParticleDefinition *&created)=0;

    pDefPair CreatePartonPair(G4int NeedParticle, G4bool AllowDiquarks=true);

  public:
    // used by G4VKinkyStringDecy.
    G4int SampleQuarkFlavor(void);
    G4ThreeVector SampleQuarkPt(G4double ptMax=-1.); // -1. no limit on maxpt.

  protected:

    // For determination of kinematical properties of created hadron
    //   virtual G4LorentzVector * SplitEandP(G4ParticleDefinition * pHadron,
    //                                        G4FragmentingString * string  )=0;

    virtual G4LorentzVector * SplitEandP(G4ParticleDefinition * pHadron,
                                         G4FragmentingString * string,
                                         G4FragmentingString * newString  )=0;

    virtual G4double GetLightConeZ(G4double zmin, G4double zmax, 
                                   G4int PartonEncoding,  
                                   G4ParticleDefinition* pHadron, 
                                   G4double Px, G4double Py       ) = 0;      

    void CalculateHadronTimePosition(G4double theInitialStringMass, 
                                     G4KineticTrackVector *);

    // Used for some test purposes 
    void ConstructParticle();

    G4ParticleDefinition* CreateHadron(G4int id1, G4int id2, 
                                       G4bool theGivenSpin, G4int theSpin); 
   
  public:

    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);

  protected:  
    G4double GetDiquarkSuppress()   {return DiquarkSuppress;};
    G4double GetDiquarkBreakProb()  {return DiquarkBreakProb;};
    G4double GetStrangeSuppress()   {return StrangeSuppress;};
    G4double GetClusterMass()       {return ClusterMass;};
    G4int    GetClusterLoopInterrupt()  {return ClusterLoopInterrupt;};

    G4double GetStringTensionParameter() {return Kappa;};
   
  protected:  
    G4double  MassCut;
    G4double  ClusterMass;
    G4double  SigmaQT;          // sigma_q_t is quark transverse momentum distribution parameter 
    G4double  DiquarkSuppress;  // is Diquark suppression parameter  
    G4double  DiquarkBreakProb; // is Diquark breaking probability 
    G4double  SmoothParam;      // model parameter
    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; // String tension parameter

    //G4double MinFragmentationMass(G4ExcitedString * theString,
    //                  G4ParticleDefinition*& Hadron1,
    //                  G4ParticleDefinition*& Hadron2);

};

// Class G4VLongitudinalStringDecay 

#endif