#include <G4VElasticCollision.hh>
Inheritance diagram for G4VElasticCollision:
Public Member Functions | |
G4VElasticCollision () | |
virtual | ~G4VElasticCollision () |
G4bool | operator== (const G4VElasticCollision &right) const |
G4bool | operator!= (const G4VElasticCollision &right) const |
virtual G4KineticTrackVector * | FinalState (const G4KineticTrack &trk1, const G4KineticTrack &trk2) const |
Definition at line 40 of file G4VElasticCollision.hh.
G4VElasticCollision::G4VElasticCollision | ( | ) |
G4VElasticCollision::~G4VElasticCollision | ( | ) | [virtual] |
G4KineticTrackVector * G4VElasticCollision::FinalState | ( | const G4KineticTrack & | trk1, | |
const G4KineticTrack & | trk2 | |||
) | const [virtual] |
Implements G4VCollision.
Definition at line 54 of file G4VElasticCollision.cc.
References G4VAngularDistribution::CosTheta(), G4KineticTrack::Get4Momentum(), G4KineticTrack::GetActualMass(), G4VCollision::GetAngularDistribution(), G4KineticTrack::GetDefinition(), G4ParticleDefinition::GetPDGMass(), G4Neutron::Neutron(), G4VAngularDistribution::Phi(), G4Proton::Proton(), and G4KineticTrack::Set4Momentum().
00056 { 00057 const G4VAngularDistribution* angDistribution; 00058 00059 angDistribution = GetAngularDistribution(); 00060 00061 00062 G4LorentzVector pCM=trk1.Get4Momentum() + trk2.Get4Momentum(); 00063 00064 G4LorentzRotation toLabFrame(pCM.boostVector()); 00065 G4LorentzVector Ptmp=toLabFrame.inverse() * trk1.Get4Momentum(); //trk1 in CMS 00066 G4LorentzRotation toZ; 00067 toZ.rotateZ(-Ptmp.phi()); 00068 toZ.rotateY(-Ptmp.theta()); 00069 toLabFrame *= toZ.inverse(); 00070 00071 G4double S = pCM.mag2(); 00072 G4double m10 = trk1.GetDefinition()->GetPDGMass(); 00073 G4double m20 = trk2.GetDefinition()->GetPDGMass(); 00074 if(S-(m10+m20)*(m10+m20) < 0) return new G4KineticTrackVector; 00075 00076 G4double m_1 = trk1.GetActualMass(); 00077 G4double m_2 = trk2.GetActualMass(); 00078 00079 // Angles of outgoing particles 00080 G4double cosTheta = angDistribution->CosTheta(S,m_1,m_2); 00081 00082 if ( (trk1.GetDefinition() == G4Proton::Proton() || trk1.GetDefinition() == G4Neutron::Neutron() ) 00083 &&(trk2.GetDefinition() == G4Proton::Proton() || trk2.GetDefinition() == G4Neutron::Neutron() ) ) 00084 { 00085 if ( trk1.GetDefinition() == trk2.GetDefinition() ) 00086 { 00087 if ( trk1.GetDefinition() == G4Proton::Proton() ) 00088 { 00089 // G4cout << "scatterangle pp " << cosTheta 00090 // << " " << typeid(*angDistribution).name() << G4endl; 00091 } else { 00092 // G4cout << "scatterangle nn " << cosTheta 00093 // << " " << typeid(*angDistribution).name() << G4endl; 00094 } 00095 } else { 00096 // G4cout << "scatterangle pn " << cosTheta 00097 // << " " << typeid(*angDistribution).name() << G4endl; 00098 } 00099 } else { 00100 // G4cout << "scatterangle other " << cosTheta 00101 // << " " << typeid(*angDistribution).name() << G4endl; 00102 } 00103 00104 G4double phi = angDistribution->Phi(); 00105 G4double Theta = std::acos(cosTheta); 00106 00107 // Unit vector of three-momentum 00108 G4ThreeVector pFinal1(std::sin(Theta)*std::cos(phi), std::sin(Theta)*std::sin(phi), cosTheta); 00109 // Three momentum in cm system 00110 G4double pInCM = std::sqrt((S-(m10+m20)*(m10+m20))*(S-(m10-m20)*(m10-m20))/(4.*S)); 00111 pFinal1 = pFinal1 * pInCM; 00112 G4ThreeVector pFinal2 = -pFinal1; 00113 00114 G4double eFinal1 = std::sqrt(pFinal1.mag2() + m10*m10); 00115 G4double eFinal2 = std::sqrt(pFinal2.mag2() + m20*m20); 00116 00117 G4LorentzVector p4Final1(pFinal1, eFinal1); 00118 G4LorentzVector p4Final2(pFinal2, eFinal2); 00119 00120 // Lorentz transformation 00121 p4Final1 *= toLabFrame; 00122 p4Final2 *= toLabFrame; 00123 00124 // Final tracks are copies of incoming ones, with modified 4-momenta 00125 G4KineticTrack* final1 = new G4KineticTrack(trk1); 00126 final1->Set4Momentum(p4Final1); 00127 G4KineticTrack* final2 = new G4KineticTrack(trk2); 00128 final2->Set4Momentum(p4Final2); 00129 00130 G4KineticTrackVector* finalTracks = new G4KineticTrackVector; 00131 finalTracks->push_back(final1); 00132 finalTracks->push_back(final2); 00133 00134 return finalTracks; 00135 }
G4bool G4VElasticCollision::operator!= | ( | const G4VElasticCollision & | right | ) | const |
G4bool G4VElasticCollision::operator== | ( | const G4VElasticCollision & | right | ) | const |