Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/util/include/G4HadPhaseSpaceGenbod.hh

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 25 //
 26 //
 27 // Multibody "phase space" generator using GENBOD (CERNLIB W515) method.
 28 //
 29 // Author:  Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
 30 
 31 #ifndef G4HadPhaseSpaceGenbod_HH
 32 #define G4HadPhaseSpaceGenbod_HH 1
 33 
 34 #include "G4VHadPhaseSpaceAlgorithm.hh"
 35 
 36 
 37 class G4HadPhaseSpaceGenbod : public G4VHadPhaseSpaceAlgorithm {
 38 public:
 39   G4HadPhaseSpaceGenbod(G4int verbose=0);
 40   virtual ~G4HadPhaseSpaceGenbod() {;}
 41 
 42 protected:
 43   virtual void GenerateMultiBody(G4double initialMass,
 44          const std::vector<G4double>& masses,
 45          std::vector<G4LorentzVector>& finalState);
 46 
 47 protected:
 48   void Initialize(G4double initialMass,
 49       const std::vector<G4double>& masses);
 50         
 51   void FillRandomBuffer();
 52 
 53   void ComputeWeightScale(const std::vector<G4double>& masses);
 54 
 55   void FillEnergySteps(G4double initialMass,
 56            const std::vector<G4double>& masses);
 57 
 58   void GenerateMomenta(const std::vector<G4double>& masses,
 59            std::vector<G4LorentzVector>& finalState);
 60 
 61   void AccumulateFinalState(size_t i,
 62           const std::vector<G4double>& masses,
 63           std::vector<G4LorentzVector>& finalState);
 64 
 65   G4bool AcceptEvent() const; // Use accept-reject to generate distribution
 66   G4double ComputeWeight() const;
 67 
 68 private:
 69   size_t nFinal;    // Number of final state particles
 70   G4double totalMass;   // Sum of final state masses
 71   G4double massExcess;    // Available kinetic energy
 72   G4double weightMax;   // Maximum possible weight
 73   G4int nTrials;    // Accept/reject cycles taken
 74 
 75   std::vector<G4double> msum; // Cumulative sum of masses
 76   std::vector<G4double> msq;  // Final state squared masses
 77   std::vector<G4double> rndm; // Random sequence for effective masses
 78   std::vector<G4double> meff; // Random final-state effective masses
 79   std::vector<G4double> pd; // Random momentum magnitudes
 80 };
 81 
 82 #endif  /* G4HadPhaseSpaceGenbod_HH */
 83