Geant4_10
G4XAqmTotal.cc
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27 // -------------------------------------------------------------------
28 // GEANT4 Class file
29 //
30 // For information related to this code contact:
31 //
32 // File name: G4XAqmTotal
33 //
34 // Author:
35 //
36 // Creation date: 15 April 1999
37 //
38 // Modifications:
39 //
40 // Additive Quark Model total cross section
41 // (H.J. Lipkin and F. Scheck, Phys.Rev. 16 (1966) 71
42 //
43 // -------------------------------------------------------------------
44 
45 #include "globals.hh"
46 #include "G4ios.hh"
47 #include "G4SystemOfUnits.hh"
48 #include "G4XAqmTotal.hh"
49 #include "G4KineticTrack.hh"
50 #include "G4ParticleDefinition.hh"
51 
52 
53 // Validity range of this cross-section
54 const G4double G4XAqmTotal::_lowLimit = 0.;
55 const G4double G4XAqmTotal::_highLimit = DBL_MAX;
56 
58 {
59  // As a first approximation the model is assumed to be valid over
60  // the entire energy range
61 }
62 
63 
65 { }
66 
67 
69 {
70  return (this == (G4XAqmTotal *) &right);
71 }
72 
73 
75 {
76  return (this != (G4XAqmTotal *) &right);
77 }
78 
79 
81 {
82  G4double sigma = 0.;
83 
84  // Get strangeness content
85  G4ParticleDefinition* def1 = trk1.GetDefinition();
86  G4int sTrk1 = def1->GetQuarkContent(3) + def1->GetAntiQuarkContent(3);
87  G4ParticleDefinition* def2 = trk2.GetDefinition();
88  G4int sTrk2 = def2->GetQuarkContent(3) + def2->GetAntiQuarkContent(3);
89 
90  // Get non-strange quark content
91  G4int qTrk1 = def1->GetQuarkContent(1) + def1->GetAntiQuarkContent(1) +
92  def1->GetQuarkContent(2) + def1->GetAntiQuarkContent(2) +
93  def1->GetQuarkContent(4) + def1->GetAntiQuarkContent(4) +
94  def1->GetQuarkContent(5) + def1->GetAntiQuarkContent(5) +
95  def1->GetQuarkContent(6) + def1->GetAntiQuarkContent(6);
96 
97  G4int qTrk2 = def2->GetQuarkContent(1) + def2->GetAntiQuarkContent(1) +
98  def2->GetQuarkContent(2) + def2->GetAntiQuarkContent(2) +
99  def2->GetQuarkContent(4) + def2->GetAntiQuarkContent(4) +
100  def2->GetQuarkContent(5) + def2->GetAntiQuarkContent(5) +
101  def2->GetQuarkContent(6) + def2->GetAntiQuarkContent(6);
102 
103  G4double sRatio1 = 0.;
104  if (qTrk1 != 0) sRatio1 = sTrk1 / qTrk1;
105 
106  G4double sRatio2 = 0.;
107  if (qTrk2 != 0) sRatio2 = sTrk2 / qTrk2;
108 
109  // Calculate the number of colliding mesons
110  G4int nMesons = 0;
111  G4int nQ1 = sTrk1 + qTrk1;
112 
113  if (nQ1 == 2) nMesons++;
114  G4int nQ2 = sTrk2 + qTrk2;
115  if (nQ2 == 2) nMesons++;
116 
117  // Cross-section (units to be checked!)
118  sigma = 40. * std::pow((2.0/3.0),nMesons) * (1. - 0.4 * sRatio1) * (1. - 0.4 * sRatio2) * millibarn;
119 
120  return sigma;
121 }
122 
123 
125 {
126  G4String name("AqmTotalCrossSection");
127  return name;
128 }
129 
130 
131 
133 {
134  G4bool answer = InLimits(e,_lowLimit,_highLimit);
135 
136  return answer;
137 }
G4int GetAntiQuarkContent(G4int flavor) const
const XML_Char * name
Definition: expat.h:151
virtual G4double CrossSection(const G4KineticTrack &trk1, const G4KineticTrack &trk2) const
Definition: G4XAqmTotal.cc:80
int G4int
Definition: G4Types.hh:78
int millibarn
Definition: hepunit.py:40
G4bool operator==(const G4XAqmTotal &right) const
Definition: G4XAqmTotal.cc:68
G4ParticleDefinition * GetDefinition() const
bool G4bool
Definition: G4Types.hh:79
G4int GetQuarkContent(G4int flavor) const
G4bool operator!=(const G4XAqmTotal &right) const
Definition: G4XAqmTotal.cc:74
virtual G4bool IsValid(G4double e) const
Definition: G4XAqmTotal.cc:132
double G4double
Definition: G4Types.hh:76
#define DBL_MAX
Definition: templates.hh:83
virtual G4String Name() const
Definition: G4XAqmTotal.cc:124
G4bool InLimits(G4double e, G4double eLow, G4double eHigh) const
virtual ~G4XAqmTotal()
Definition: G4XAqmTotal.cc:64