#include "AliGenSlowNucleons.h"
#include "AliSlowNucleonModel.h"
- ClassImp(AliGenSlowNucleons)
+ClassImp(AliGenSlowNucleons)
+
- AliGenSlowNucleons::AliGenSlowNucleons():AliGenerator(-1)
+AliGenSlowNucleons::AliGenSlowNucleons()
+ :AliGenerator(-1),
+ fCMS(0.),
+ fMomentum(0.),
+ fBeta(0.),
+ fPmax (0.),
+ fCharge(0),
+ fProtonDirection(1.),
+ fTemperatureG(0.),
+ fBetaSourceG(0.),
+ fTemperatureB(0.),
+ fBetaSourceB(0.),
+ fNgp(0),
+ fNgn(0),
+ fNbp(0),
+ fNbn(0),
+ fDebug(0),
+ fDebugHist1(0),
+ fDebugHist2(0),
+ fThetaDistribution(),
+ fCosThetaGrayHist(),
+ fCosTheta(),
+ fSlowNucleonModel(0)
{
// Default constructor
- fSlowNucleonModel = 0;
fCollisionGeometry = 0;
}
AliGenSlowNucleons::AliGenSlowNucleons(Int_t npart)
- :AliGenerator(npart)
+ :AliGenerator(npart),
+ fCMS(14000.),
+ fMomentum(0.),
+ fBeta(0.),
+ fPmax (10.),
+ fCharge(1),
+ fProtonDirection(1.),
+ fTemperatureG(0.05),
+ fBetaSourceG(0.05),
+ fTemperatureB(0.005),
+ fBetaSourceB(0.),
+ fNgp(0),
+ fNgn(0),
+ fNbp(0),
+ fNbn(0),
+ fDebug(0),
+ fDebugHist1(0),
+ fDebugHist2(0),
+ fThetaDistribution(),
+ fCosThetaGrayHist(),
+ fCosTheta(),
+ fSlowNucleonModel(new AliSlowNucleonModel())
{
// Constructor
fName = "SlowNucleons";
fTitle = "Generator for gray particles in pA collisions";
- SetPmax();
- SetTarget();
- SetNominalCmsEnergy();
- SetCharge();
- SetTemperature();
- SetBetaSource();
- fSlowNucleonModel = new AliSlowNucleonModel();
fCollisionGeometry = 0;
- fDebug = 0;
-}
-
-//____________________________________________________________
-AliGenSlowNucleons::AliGenSlowNucleons(const AliGenSlowNucleons & sn):
- AliGenerator(sn)
-{
-// Copy constructor
- sn.Copy(*this);
}
//____________________________________________________________
//
// Initialization
//
- Float_t kMass = TDatabasePDG::Instance()->GetParticle(kProton)->Mass();
- fMomentum = fCMS/2. * fZTarget / fATarget;
+ 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.);
TCanvas *c = new TCanvas("c","Canvas 1",400,10,600,700);
c->Divide(2,1);
c->cd(1);
- fDebugHist1->Draw();
+ fDebugHist1->Draw("colz");
c->cd(2);
fDebugHist2->Draw();
c->cd(3);
//
if (fCollisionGeometry) {
Float_t b = fCollisionGeometry->ImpactParameter();
- Int_t nn = fCollisionGeometry->NN();
- Int_t nwn = fCollisionGeometry->NwN();
- Int_t nnw = fCollisionGeometry->NNw();
- Int_t nwnw = fCollisionGeometry->NwNw();
-
- fSlowNucleonModel->GetNumberOfSlowNucleons(fCollisionGeometry, fNgp, fNgn, fNbp, fNbn);
+ // Int_t nn = fCollisionGeometry->NN();
+ // Int_t nwn = fCollisionGeometry->NwN();
+ // Int_t nnw = fCollisionGeometry->NNw();
+ // Int_t nwnw = fCollisionGeometry->NwNw();
+
+ //fSlowNucleonModel->GetNumberOfSlowNucleons(fCollisionGeometry, fNgp, fNgn, fNbp, fNbn);
+ fSlowNucleonModel->GetNumberOfSlowNucleons2(fCollisionGeometry, fNgp, fNgn, fNbp, fNbn);
if (fDebug) {
- printf("Nucleons %d %d %d %d \n", fNgp, fNgn, fNbp, fNbn);
- fDebugHist1->Fill(Float_t(fNgp + fNgn + fNbp + fNbn), fCollisionGeometry->NwN(), 1.);
+ //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->NNw(), 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.};
Int_t nt, i, j;
Int_t kf;
if(fVertexSmear == kPerEvent) {
Vertex();
for (j=0; j < 3; j++) origin[j] = fVertex[j];
+ time = fTime;
} // if kPerEvent
//
// Gray protons
GenerateSlow(fCharge, fTemperatureG, fBetaSourceG, p, theta);
if (fDebug) fCosThetaGrayHist->Fill(TMath::Cos(theta));
PushTrack(fTrackIt, -1, kf, p, origin, polar,
- 0., kPNoProcess, nt, 1.);
+ time, kPNoProcess, nt, 1.,-2);
KeepTrack(nt);
}
//
GenerateSlow(fCharge, fTemperatureG, fBetaSourceG, p, theta);
if (fDebug) fCosThetaGrayHist->Fill(TMath::Cos(theta));
PushTrack(fTrackIt, -1, kf, p, origin, polar,
- 0., kPNoProcess, nt, 1.);
+ time, kPNoProcess, nt, 1.,-2);
KeepTrack(nt);
}
//
for(i = 0; i < fNbp; i++) {
GenerateSlow(fCharge, fTemperatureB, fBetaSourceB, p, theta);
PushTrack(fTrackIt, -1, kf, p, origin, polar,
- 0., 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,
- 0., 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. %1.4f, beta %f \n",charge,T,beta);
+
Double_t m, pmax, p, f, phi;
TDatabasePDG * pdg = TDatabasePDG::Instance();
const Double_t kMassProton = pdg->GetParticle(kProton) ->Mass();
/* 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*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]);
}
-
-AliGenSlowNucleons& AliGenSlowNucleons::operator=(const AliGenSlowNucleons& rhs)
-{
-// Assignment operator
- rhs.Copy(*this);
- return *this;
-}
-
-void AliGenSlowNucleons::Copy(TObject&) const
-{
- //
- // Copy
- //
- Fatal("Copy","Not implemented!\n");
-}
-
-
-
-
-
-
-
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff