//
// Initialization
//
- Float_t kMass = TDatabasePDG::Instance()->GetParticle(kProton)->Mass();
+ Double_t kMass = TDatabasePDG::Instance()->GetParticle(kProton)->Mass();
fMomentum = fCMS/2. * Float_t(fZTarget) / Float_t(fATarget);
fBeta = fMomentum / TMath::Sqrt(kMass * kMass + fMomentum * fMomentum);
+ //printf(" fMomentum %f fBeta %1.10f\n",fMomentum, fBeta);
if (fDebug) {
fDebugHist1 = new TH2F("DebugHist1", "nu vs N_slow", 100, 0., 100., 20, 0., 20.);
fDebugHist2 = new TH2F("DebugHist2", "b vs N_slow", 100, 0., 100., 15, 0., 15.);
// Int_t nwn = fCollisionGeometry->NwN();
// Int_t nnw = fCollisionGeometry->NNw();
// Int_t nwnw = fCollisionGeometry->NwNw();
-
+
fSlowNucleonModel->GetNumberOfSlowNucleons(fCollisionGeometry, fNgp, fNgn, fNbp, fNbn);
if (fDebug) {
+ //printf("Collision Geometry %f %d %d %d %d\n", b, nn, nwn, nnw, nwnw);
printf("Slow nucleons: %d grayp %d grayn %d blackp %d blackn \n", fNgp, fNgn, fNbp, fNbn);
fDebugHist1->Fill(Float_t(fNgp + fNgn + fNbp + fNbn), fCollisionGeometry->NwN(), 1.);
fDebugHist2->Fill(Float_t(fNgp + fNgn + fNbp + fNbn), b, 1.);
- //printf("AliGenSlowNucleons: Impact parameter from Collision Geometry %f %d %d %d %d\n", b, nn, nwn, nnw, nwnw);
}
}
//
- Float_t p[3], theta=0;
+ Float_t p[3] = {0., 0., 0.}, theta=0;
Float_t origin[3] = {0., 0., 0.};
Float_t time = 0.;
Float_t polar [3] = {0., 0., 0.};
GenerateSlow(fCharge, fTemperatureG, fBetaSourceG, p, theta);
if (fDebug) fCosThetaGrayHist->Fill(TMath::Cos(theta));
PushTrack(fTrackIt, -1, kf, p, origin, polar,
- time, kPNoProcess, nt, 1.);
+ time, kPNoProcess, nt, 1.,-1);
KeepTrack(nt);
}
//
GenerateSlow(fCharge, fTemperatureG, fBetaSourceG, p, theta);
if (fDebug) fCosThetaGrayHist->Fill(TMath::Cos(theta));
PushTrack(fTrackIt, -1, kf, p, origin, polar,
- time, kPNoProcess, nt, 1.);
+ time, kPNoProcess, nt, 1.,-1);
KeepTrack(nt);
}
//
for(i = 0; i < fNbp; i++) {
GenerateSlow(fCharge, fTemperatureB, fBetaSourceB, p, theta);
PushTrack(fTrackIt, -1, kf, p, origin, polar,
- time, kPNoProcess, nt, 1.);
+ time, kPNoProcess, nt, 1.,-1);
KeepTrack(nt);
}
//
for(i = 0; i < fNbn; i++) {
GenerateSlow(fCharge, fTemperatureB, fBetaSourceB, p, theta);
PushTrack(fTrackIt, -1, kf, p, origin, polar,
- time, kPNoProcess, nt, 1.);
+ time, kPNoProcess, nt, 1.,-1);
KeepTrack(nt);
}
}
Three-momentum [GeV/c] is given back in q[3]
*/
- //printf("Generating slow nuc. with: charge %d. temp. %1.3f, beta %1.2f\n",charge,T,beta);
+ //printf("Generating slow nuc. with: charge %d. temp. %1.4f, beta %f \n",charge,T,beta);
Double_t m, pmax, p, f, phi;
TDatabasePDG * pdg = TDatabasePDG::Instance();
/* Momentum at maximum of Maxwell-distribution */
- pmax = TMath::Sqrt(2*T*(T+sqrt(T*T+m*m)));
+ pmax = TMath::Sqrt(2*T*(T+TMath::Sqrt(T*T+m*m)));
/* Try until proper momentum */
/* for lack of primitive function of the Maxwell-distribution */
//
phi = 2. * TMath::Pi() * Rndm();
+
/* Determine momentum components in system of the moving source */
q[0] = p * TMath::Sin(theta) * TMath::Cos(phi);
q[1] = p * TMath::Sin(theta) * TMath::Sin(phi);
q[2] = p * TMath::Cos(theta);
+
/* Transform to system of the target nucleus */
/* beta is passed as negative, because the gray nucleons are slowed down */
Lorentz(m, -beta, q);
-
+
/* Transform to laboratory system */
Lorentz(m, fBeta, q);
q[2] *= fProtonDirection;
+
}
Double_t AliGenSlowNucleons::Maxwell(Double_t m, Double_t p, Double_t T)
{
/* Lorentz transform in the direction of q[2] */
- Double_t gamma = 1./sqrt((1.-beta)*(1.+beta));
- Double_t energy = sqrt(m*m + q[0]*q[0] + q[1]*q[1] + q[2]*q[2]);
+ Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
+ Double_t energy = TMath::Sqrt(m*m + q[0]*q[0] + q[1]*q[1] + q[2]*q[2]);
q[2] = gamma * (q[2] + beta*energy);
+ //printf(" \t beta %1.10f gamma %f energy %f -> p_z = %f\n",beta, gamma, energy,q[2]);
}