Geant4 Cross Reference

Cross-Referencing   Geant4
Geant4/processes/hadronic/util/src/G4VHadPhaseSpaceAlgorithm.cc

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 25 //
 26 //
 27 // Abstract base class for multibody uniform phase space generators.
 28 // Subclasses implement a specific algorithm, such as Kopylov, GENBOD,
 29 // or Makoto's NBody.  Subclasses are used by G4HadDecayGenerator.
 30 //
 31 // Author:  Michael Kelsey (SLAC) <kelsey@slac.stanford.edu>
 32 
 33 #include "G4VHadPhaseSpaceAlgorithm.hh"
 34 #include "G4HadronicException.hh"
 35 #include "G4PhysicalConstants.hh"
 36 #include "G4SystemOfUnits.hh"
 37 #include "G4ThreeVector.hh"
 38 #include "Randomize.hh"
 39 #include <algorithm>
 40 #include <iostream>
 41 #include <iterator>
 42 #include <numeric>
 43 #include <vector>
 44 
 45 
 46 
 47 
 48 // Two body decay with uniform angular distribution
 49 
 50 void G4VHadPhaseSpaceAlgorithm::
 51 GenerateTwoBody(G4double initialMass,
 52     const std::vector<G4double>& masses,
 53     std::vector<G4LorentzVector>& finalState) {
 54   if (GetVerboseLevel()>1) 
 55     G4cout << " >>> G4HadDecayGenerator::FillTwoBody" << G4endl;
 56 
 57   // Initialization and sanity check
 58   finalState.clear();
 59   if (masses.size() != 2U) return;  // Should not have been called
 60 
 61   // Momentum of final state (energy balance has already been checked)
 62   G4double p = TwoBodyMomentum(initialMass,masses[0],masses[1]);
 63   if (GetVerboseLevel()>2) G4cout << " finalState momentum = " << p << G4endl;
 64 
 65   finalState.resize(2);       // Allows filling by index
 66   finalState[0].setVectM(UniformVector(p), masses[0]);
 67   finalState[1].setVectM(-finalState[0].vect(), masses[1]);
 68 }
 69 
 70 
 71 // Samples a random vector with given magnitude
 72 
 73 G4ThreeVector G4VHadPhaseSpaceAlgorithm::UniformVector(G4double mag) const {
 74   // FIXME:  Should this be made a static thread-local buffer?
 75   G4ThreeVector v;
 76   v.setRThetaPhi(mag, UniformTheta(), UniformPhi());
 77   return v;
 78 }
 79