Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/util/include/G4VHadDecayAlgorithm.hh

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 25 //
 26 //
 27 // Abstract base class for multibody "phase space" generators.  Subclasses
 28 // implement a specific algorithm, such as Kopylov, GENBOD, or Makoto's
 29 // NBody.  Subclasses are used by G4HadPhaseSpaceGenerator.
 30 //
 31 // Author:  Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
 32 
 33 #ifndef G4VHadDecayAlgorithm_HH
 34 #define G4VHadDecayAlgorithm_HH 1
 35 
 36 #include "globals.hh"
 37 #include "G4LorentzVector.hh"
 38 #include "G4ThreeVector.hh"
 39 #include <vector>
 40 #include <iosfwd>
 41 
 42 class G4VHadDecayAlgorithm {
 43 public:
 44   G4VHadDecayAlgorithm(const G4String& algName, G4int verbose=0)
 45     : name(algName), verboseLevel(verbose) {;}
 46   virtual ~G4VHadDecayAlgorithm() {;}
 47 
 48   // Initial state (rest mass) and list of final masses
 49   void Generate(G4double initialMass,
 50     const std::vector<G4double>& masses,
 51     std::vector<G4LorentzVector>& finalState);
 52 
 53   // Enable (or disable if 0) diagnostic messages (subclass may overload)
 54   virtual void  SetVerboseLevel(G4int verbose) { verboseLevel = verbose; }
 55   G4int GetVerboseLevel() const { return verboseLevel; }
 56   const G4String& GetName() const { return name; }
 57   
 58 protected:
 59   // Subclasses MUST implement these functions
 60   virtual void GenerateTwoBody(G4double initialMass,
 61              const std::vector<G4double>& masses,
 62              std::vector<G4LorentzVector>& finalState) = 0;
 63 
 64   virtual void GenerateMultiBody(G4double initialMass,
 65          const std::vector<G4double>& masses,
 66          std::vector<G4LorentzVector>& finalState) = 0;
 67 
 68   // Validate kinematics (e.g., limit number of final state particles)
 69   // Subclasses may override or call back to this function
 70   virtual G4bool IsDecayAllowed(G4double initialMass,
 71         const std::vector<G4double>& masses) const;
 72 
 73   // Two-body momentum function (c.f. PDK from CERNLIB W505)
 74   G4double TwoBodyMomentum(G4double M0, G4double M1, G4double M2) const;
 75 
 76   // Convenience functions for uniform angular distributions
 77   G4double UniformTheta() const;
 78   G4double UniformPhi() const;
 79 
 80   // Utility to dump vector contents to line of output
 81   void PrintVector(const std::vector<G4double>& v, const G4String& name,
 82        std::ostream& os) const;
 83 
 84 private:
 85   G4String name;
 86   G4int verboseLevel;
 87 };
 88 
 89 #endif  /* G4VHadDecayAlgorithm_HH */
 90