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