// and quark fragmentation functions.
// Is a generalisation of AliGenParam class for correlated pairs of hadrons.
// In this version quark pairs and fragmentation functions are obtained from
-// Pythia6.124 using 100K events generated with kCharmppMNRwmi & kBeautyppMNRwmi
-// in pp collisions at 14 TeV.
-// Decays are performed by Pythia. Used AliRoot version: v4-04-Release
+// ~2.10^6 Pythia6.214 events generated with kCharmppMNRwmi & kBeautyppMNRwmi,
+// CTEQ5L PDF and Pt_hard = 2.76 GeV/c for p-p collisions at 7, 10 and 14 TeV,
+// and with kCharmppMNR (Pt_hard = 2.10 GeV/c) & kBeautyppMNR (Pt_hard = 2.75 GeV/c),
+// CTEQ4L PDF for Pb-Pb at 3.94 TeV, for p-Pb & Pb-p at 8.8 TeV.
+// Decays are performed by Pythia.
// Author: S. Grigoryan, LPC Clermont-Fd & YerPhI, Smbat.Grigoryan@cern.ch
-//
+// July 07: added quarks in the stack (B. Vulpescu)
+// April 09: added energy choice between 10 and 14 TeV (S. Grigoryan)
+// Sept 09: added hadron pair composition probabilities via 2D histo (X.M. Zhang)
+// Oct 09: added energy choice between 7, 10, 14 TeV (for p-p), 4 TeV (for Pb-Pb),
+// 9 TeV (for p-Pb) and -9 TeV (for Pb-p) (S. Grigoryan)
//-------------------------------------------------------------------------
-// How it works (for the given flavor):
+// How it works (for the given flavor and p-p energy):
//
// 1) Reads QQbar kinematical grid from the Input file and generates
// quark pairs according to the weights of the cells.
// on 2 variables - light cone energy-momentum fractions:
// z1=(E_H + Pz_H)/(E_Q + Pz_Q), z2=(E_H - Pz_H)/(E_Q - Pz_Q).
// "soft" & "hard" FFs correspond to "slower" & "faster" quark of a pair
-// (see details in GetHadronPair).
+// (see details in GetHadronPair). Fragmentation does not depend on p-p energy.
// 3) Decays the hadrons and saves all the particles in the event stack in the
// following order: HF hadron from Q, then its decay products, then HF hadron
// from Qbar, then its decay productes, then next HF hadon pair (if any)
// 4) It is fast, e.g., generates the same number of events with a beauty pair
// ~15 times faster than AliGenPythia with kBeautyppMNRwmi (w/o tracking)
//
-// An Input file for each quark flavor is included in EVGEN/dataCorrHF/
+// An Input file for each quark flavor and p-p energy is in EVGEN/dataCorrHF/
// One can use also user-defined Input files.
//
// More details could be found in my presentation at DiMuonNet Workshop, Dec 2006:
-// http://www-dapnia.cea.fr/Sphn/Alice/DiMuonNet
-// and will be published in an Internal Note.
+// http://www-dapnia.cea.fr/Sphn/Alice/DiMuonNet.
//
//-------------------------------------------------------------------------
// How to use it:
// add the following typical lines in Config.C
/*
if (!strcmp(option,"corr")) {
- // Example for correlated charm or beauty hadron pair production
+ // An example for correlated charm or beauty hadron pair production at 14 TeV
- // AliGenCorrHF *gener = new AliGenCorrHF(1, 4); // for charm, 1 pair per event
- AliGenCorrHF *gener = new AliGenCorrHF(1, 5); // for beauty, 1 pair per event
+ // AliGenCorrHF *gener = new AliGenCorrHF(1, 4, 14); // for charm, 1 pair per event
+ AliGenCorrHF *gener = new AliGenCorrHF(1, 5, 14); // for beauty, 1 pair per event
gener->SetMomentumRange(0,9999);
- gener->SetCutOnChild(0); // 1/0 means cuts on children enable/disable
+ gener->SetCutOnChild(0); // 1/0 means cuts on children enable/disable
gener->SetChildThetaRange(171.0,178.0);
gener->SetOrigin(0,0,0); //vertex position
gener->SetSigma(0,0,0); //Sigma in (X,Y,Z) (cm) on IP position
// One can include AliGenCorrHF in an AliGenCocktail generator.
//--------------------------------------------------------------------------
+#include <Riostream.h>
+#include <TCanvas.h>
+#include <TClonesArray.h>
+#include <TDatabasePDG.h>
#include <TFile.h>
-#include <TTree.h>
#include <TH2F.h>
-#include <TMath.h>
-#include <TRandom.h>
-#include <TROOT.h>
#include <TLorentzVector.h>
+#include <TMath.h>
#include <TParticle.h>
#include <TParticlePDG.h>
-#include <TDatabasePDG.h>
+#include <TROOT.h>
+#include <TRandom.h>
+#include <TTree.h>
#include <TVirtualMC.h>
-#include <TCanvas.h>
-#include <Riostream.h>
+#include <TVector3.h>
#include "AliGenCorrHF.h"
#include "AliLog.h"
#include "AliDecayer.h"
#include "AliMC.h"
#include "AliRun.h"
+#include "AliGenEventHeader.h"
ClassImp(AliGenCorrHF)
Double_t AliGenCorrHF::fgdph[19] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180};
Double_t AliGenCorrHF::fgy[31] = {-10,-7, -6.5, -6, -5.5, -5, -4.5, -4, -3.5, -3, -2.5, -2,- 1.5, -1, -0.5, 0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.5, 7, 10};
-Double_t AliGenCorrHF::fgpt[33] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.6, 7.2, 7.8, 8.4, 9, 9.6, 10.3, 11.1, 12, 13.1, 14.3, 15.6, 17.1, 19, 21, 24, 28, 35, 50, 100};
+Double_t AliGenCorrHF::fgpt[51] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 3.5, 4, 4.5, 5, 5.5, 6, 6.6, 7.2, 7.8, 8.4, 9, 9.6, 10.3, 11.1, 12, 13, 14, 15, 16, 17, 18, 19, 20.1, 21.5, 23, 24.5, 26, 27.5, 29.1, 31, 33, 35, 37, 39.2, 42, 45, 48, 51, 55.2, 60, 65, 71, 81, 100};
Int_t AliGenCorrHF::fgnptbins = 12;
Double_t AliGenCorrHF::fgptbmin[12] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9};
Double_t AliGenCorrHF::fgptbmax[12] = {0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9, 100};
fFileName(0),
fFile(0),
fQuark(0),
+ fEnergy(0),
fBias(0.),
fTrials(0),
fDecayer(0)
}
//____________________________________________________________
-AliGenCorrHF::AliGenCorrHF(Int_t npart, Int_t param):
+AliGenCorrHF::AliGenCorrHF(Int_t npart, Int_t idquark, Int_t energy):
AliGenMC(npart),
fFileName(0),
fFile(0),
- fQuark(param),
+ fQuark(idquark),
+ fEnergy(energy),
fBias(0.),
fTrials(0),
// fDecayer(new AliDecayerPythia())
fDecayer(0)
{
-// Constructor using number of particles, quark type & default InputFile
+// Constructor using particle number, quark type, energy & default InputFile
//
- if (fQuark != 5) fQuark = 4;
- fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmppMNRwmiCorr100K.root";
- if (fQuark == 5) fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyppMNRwmiCorr100K.root";
-
+ if (fQuark == 5) {
+ if (fEnergy == 7)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP7PythiaMNRwmi.root";
+ else if (fEnergy == 10)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP10PythiaMNRwmi.root";
+ else if (fEnergy == 14)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP14PythiaMNRwmi.root";
+ else if (fEnergy == 4)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root";
+ else if (fEnergy == 9 || fEnergy == -9)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPPb88PythiaMNR.root";
+ else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root";
+ }
+ else {
+ fQuark = 4;
+ if (fEnergy == 7)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP7PythiaMNRwmi.root";
+ else if (fEnergy == 10)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP10PythiaMNRwmi.root";
+ else if (fEnergy == 14)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP14PythiaMNRwmi.root";
+ else if (fEnergy == 4)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root";
+ else if (fEnergy == 9 || fEnergy == -9)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPPb88PythiaMNR.root";
+ else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root";
+ }
fName = "Default";
fTitle= "Generator for correlated pairs of HF hadrons";
}
//___________________________________________________________________
-AliGenCorrHF::AliGenCorrHF(char* tname, Int_t npart, Int_t param):
+AliGenCorrHF::AliGenCorrHF(char* tname, Int_t npart, Int_t idquark, Int_t energy):
AliGenMC(npart),
fFileName(tname),
fFile(0),
- fQuark(param),
+ fQuark(idquark),
+ fEnergy(energy),
fBias(0.),
fTrials(0),
// fDecayer(new AliDecayerPythia())
fDecayer(0)
{
-// Constructor using number of particles, quark type & user-defined InputFile
+// Constructor using particle number, quark type, energy & user-defined InputFile
//
if (fQuark != 5) fQuark = 4;
fName = "UserDefined";
SetChildThetaRange();
}
-//____________________________________________________________
-AliGenCorrHF::AliGenCorrHF(const AliGenCorrHF & CorrHF)
- :AliGenMC(CorrHF),
- fFileName(0),
- fFile(0),
- fQuark(0),
- fBias(0.),
- fTrials(0),
- fDecayer(0)
-{
-// Copy constructor
- CorrHF.Copy(*this);
-}
-
//____________________________________________________________
AliGenCorrHF::~AliGenCorrHF()
{
}
ComputeIntegral(fFile);
-
+
fParentWeight = 1./fNpart; // fNpart is number of HF-hadron pairs
// particle decay related initialization
//
AliGenMC::Init();
}
-
//____________________________________________________________
void AliGenCorrHF::Generate()
{
//
// Generate fNpart of correlated HF hadron pairs per event
-// in the the desired theta and momentum windows (phi = 0 - 2pi).
-// Gaussian smearing on the vertex is done if selected.
-// The decay of heavy hadrons is done using lujet,
-// and the childern particle are tracked by GEANT
-// However, light mesons are directly tracked by GEANT
-// setting fForceDecay = nodecay (SetForceDecay(nodecay))
+// in the the desired theta and momentum windows (phi = 0 - 2pi).
//
+// Reinitialize decayer
+ fDecayer->SetForceDecay(fForceDecay);
+ fDecayer->Init();
+
+ //
Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking)
Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking)
Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle
Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum
Float_t p[3], pc[3], och[3];// Momentum, polarisation and origin of the children particles from lujet
+ Int_t nt, i, j, ipa, ihadron[2], iquark[2];
+ Float_t wgtp, wgtch, random[6];
+ Float_t pq[2][3]; // Momenta of the two quarks
+ Int_t ntq[2] = {-1, -1};
+ Double_t tanhy2, qm = 0;
-
- Double_t dphi=0, ptq[2], yq[2], pth[2], plh[2], ph[2], phih[2];
- Int_t i, j, ipair, ihadron[2];
+ Double_t dphi=0, ptq[2], yq[2], pth[2], plh[2], ph[2], phih[2], phiq[2];
for (i=0; i<2; i++) {
- ptq[i] =0;
- yq[i] =0;
- pth[i] =0;
- plh[i] =0;
+ ptq[i] =0;
+ yq[i] =0;
+ pth[i] =0;
+ plh[i] =0;
+ phih[i] =0;
+ phiq[i] =0;
ihadron[i] =0;
+ iquark[i] =0;
}
+ // same quarks mass as in the fragmentation functions
+ if (fQuark == 4) qm = 1.20;
+ else qm = 4.75;
+
static TClonesArray *particles;
//
if(!particles) particles = new TClonesArray("TParticle",1000);
- TDatabasePDG* pDataBase = TDatabasePDG::Instance();
-
-// Calculating vertex position per event
+ TDatabasePDG *pDataBase = TDatabasePDG::Instance();
+ //
+
+ // Calculating vertex position per event
for (j=0;j<3;j++) origin0[j]=fOrigin[j];
- if(fVertexSmear==kPerEvent) {
- Vertex();
- for (j=0;j<3;j++) origin0[j]=fVertex[j];
+ if (fVertexSmear==kPerEvent) {
+ Vertex();
+ for (j=0;j<3;j++) origin0[j]=fVertex[j];
}
- Float_t wgtp, wgtch, random[6];
- Int_t ipap = 0;
- Int_t nt = 0;
+ ipa=0;
+
+ // Generating fNpart HF-hadron pairs
+ fNprimaries = 0;
+
+ while (ipa<2*fNpart) {
+
+ GetQuarkPair(fFile, fgIntegral, yq[0], yq[1], ptq[0], ptq[1], dphi);
+
+ GetHadronPair(fFile, fQuark, yq[0], yq[1], ptq[0], ptq[1], ihadron[0], ihadron[1], plh[0], plh[1], pth[0], pth[1]);
+
+ if (fEnergy == 9 || fEnergy == -9) { // boost particles from c.m.s. to ALICE lab frame
+ Double_t dyBoost = 0.47;
+ Double_t beta = TMath::TanH(dyBoost);
+ Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
+ Double_t gb = gamma * beta;
+ yq[0] += dyBoost;
+ yq[1] += dyBoost;
+ plh[0] = gb * TMath::Sqrt(plh[0]*plh[0] + pth[0]*pth[0]) + gamma * plh[0];
+ plh[1] = gb * TMath::Sqrt(plh[1]*plh[1] + pth[1]*pth[1]) + gamma * plh[1];
+ if (fEnergy == 9) {
+ yq[0] *= -1;
+ yq[1] *= -1;
+ plh[0] *= -1;
+ plh[1] *= -1;
+ }
+ }
-// Generating fNpart HF-hadron pairs per event
- while(ipap<fNpart) {
+ // Cuts from AliGenerator
+
+ // Cut on theta
+ theta=TMath::ATan2(pth[0],plh[0]);
+ if (theta<fThetaMin || theta>fThetaMax) continue;
+ theta=TMath::ATan2(pth[1],plh[1]);
+ if (theta<fThetaMin || theta>fThetaMax) continue;
+
+ // Cut on momentum
+ ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]);
+ if (ph[0]<fPMin || ph[0]>fPMax) continue;
+ ph[1]=TMath::Sqrt(pth[1]*pth[1]+plh[1]*plh[1]);
+ if (ph[1]<fPMin || ph[1]>fPMax) continue;
+
+ // Add the quarks in the stack
+
+ phiq[0] = Rndm()*k2PI;
+ if (Rndm() < 0.5) {
+ phiq[1] = phiq[0] + dphi*kDegrad;
+ } else {
+ phiq[1] = phiq[0] - dphi*kDegrad;
+ }
+ if (phiq[1] > k2PI) phiq[1] -= k2PI;
+ if (phiq[1] < 0 ) phiq[1] += k2PI;
+
+ // quarks pdg
+ iquark[0] = +fQuark;
+ iquark[1] = -fQuark;
+
+ // px and py
+ TVector2 qvect1 = TVector2();
+ TVector2 qvect2 = TVector2();
+ qvect1.SetMagPhi(ptq[0],phiq[0]);
+ qvect2.SetMagPhi(ptq[1],phiq[1]);
+ pq[0][0] = qvect1.Px();
+ pq[0][1] = qvect1.Py();
+ pq[1][0] = qvect2.Px();
+ pq[1][1] = qvect2.Py();
+
+ // pz
+ tanhy2 = TMath::TanH(yq[0]);
+ tanhy2 *= tanhy2;
+ pq[0][2] = TMath::Sqrt((ptq[0]*ptq[0]+qm*qm)*tanhy2/(1-tanhy2));
+ pq[0][2] = TMath::Sign((Double_t)pq[0][2],yq[0]);
+ tanhy2 = TMath::TanH(yq[1]);
+ tanhy2 *= tanhy2;
+ pq[1][2] = TMath::Sqrt((ptq[1]*ptq[1]+qm*qm)*tanhy2/(1-tanhy2));
+ pq[1][2] = TMath::Sign((Double_t)pq[1][2],yq[1]);
+
+ // Here we assume that |phi_H1 - phi_H2| = |phi_Q1 - phi_Q2| = dphi
+ // which is a good approximation for heavy flavors in Pythia
+ // ... moreover, same phi angles as for the quarks ...
+
+ phih[0] = phiq[0];
+ phih[1] = phiq[1];
+ for (Int_t ihad = 0; ihad < 2; ihad++) {
while(1) {
+ //
+ // particle type
+ Int_t iPart = ihadron[ihad];
+ fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
+ wgtp=fParentWeight;
+ wgtch=fChildWeight;
+ TParticlePDG *particle = pDataBase->GetParticle(iPart);
+ Float_t am = particle->Mass();
+ phi = phih[ihad];
+ pt = pth[ihad];
+ pl = plh[ihad];
+ ptot=TMath::Sqrt(pt*pt+pl*pl);
+
+ p[0]=pt*TMath::Cos(phi);
+ p[1]=pt*TMath::Sin(phi);
+ p[2]=pl;
- GetQuarkPair(fFile, fgIntegral, yq[0], yq[1], ptq[0], ptq[1], dphi);
-
- GetHadronPair(fFile, fQuark, yq[0], yq[1], ptq[0], ptq[1], ihadron[0], ihadron[1], plh[0], plh[1], pth[0], pth[1]);
-
-// Here we assume that |phi_H1 - phi_H2| = |phi_Q1 - phi_Q2| = dphi
-// which is a good approximation for heavy flavors in Pythia
-
- /* // doesn't work if PhiMax < k2PI or PhiMin > 0, since dphi = 0 - 180
- phih[0] = fPhiMin + Rndm()*(fPhiMax-fPhiMin);
- phih[1] = phih[0] + dphi*kDegrad;
- if (phih[0] > fPhiMax/2.) phih[1] = phih[0] - dphi*kDegrad;
- */
- phih[0] = Rndm()*k2PI;
- phih[1] = phih[0] + dphi*kDegrad;
- if (phih[0] > TMath::Pi()) phih[1] = phih[0] - dphi*kDegrad;
-
-// Cut on theta
- theta=TMath::ATan2(pth[0],plh[0]);
- if(theta<fThetaMin || theta>fThetaMax) continue;
- theta=TMath::ATan2(pth[1],plh[1]);
- if(theta<fThetaMin || theta>fThetaMax) continue;
-
-// Cut on momentum
- ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]);
- if (ph[0]<fPMin || ph[0]>fPMax) continue;
- ph[1]=TMath::Sqrt(pth[1]*pth[1]+plh[1]*plh[1]);
- if (ph[1]<fPMin || ph[1]>fPMax) continue;
-
-// Common origin for particles of the HF-hadron pair
if(fVertexSmear==kPerTrack) {
- Rndm(random,6);
- for (j=0;j<3;j++) {
- origin0[j]=
- fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
- TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
- }
- }
-
- Int_t np1=0, kf1[100], select1[100], iparent1[100], trackIt1[100];
- Float_t wgtch1=0, p1[3], pc1[100][3], och1[100][3];
-
- for (j=0; j<3; j++) p1[j] = 0;
- for (i=0; i<100; i++) {
- kf1[i] = 0;
- select1[i] = 0;
- iparent1[i] = 0;
- trackIt1[i] = 0;
- for (j=0; j<3; j++) {
- pc1[i][j] = 0;
- och1[i][j] = 0;
+ Rndm(random,6);
+ for (j=0;j<3;j++) {
+ origin0[j]=
+ fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
+ TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
}
}
-
-//
-// Loop over particles of the HF-hadron pair
- Int_t nhadron = 0;
- for (ipair=0;ipair<2;ipair++) {
- phi = phih[ipair];
- pl = plh[ipair];
- pt = pth[ipair];
- ptot = ph[ipair];
-//
-// particle type
- Int_t iPart = ihadron[ipair];
- Float_t am = pDataBase->GetParticle(iPart)->Mass();
- fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
-
- wgtp = fParentWeight;
- wgtch = fChildWeight;
-
-//
- p[0]=pt*TMath::Cos(phi);
- p[1]=pt*TMath::Sin(phi);
- p[2]=pl;
-
-// Looking at fForceDecay :
-// if fForceDecay != none Primary particle decays using
-// AliPythia and children are tracked by GEANT
-//
-// if fForceDecay == none Primary particle is tracked by GEANT
-// (In the latest, make sure that GEANT actually does all the decays you want)
-//
-
- if (fForceDecay != kNoDecay) {
-// Using lujet to decay particle
- Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
- TLorentzVector pmom(p[0], p[1], p[2], energy);
- fDecayer->Decay(iPart,&pmom);
-//
-// select decay particles
- Int_t np=fDecayer->ImportParticles(particles);
-
-// Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut;
- if (fGeometryAcceptance)
- if (!CheckAcceptanceGeometry(np,particles)) break;
- Int_t ncsel=0;
- Int_t* pParent = new Int_t[np];
- Int_t* pSelected = new Int_t[np];
- Int_t* trackIt = new Int_t[np];
-
- for (i=0; i<np; i++) {
- pSelected[i] = 0;
- pParent[i] = -1;
+
+ // Looking at fForceDecay :
+ // if fForceDecay != none Primary particle decays using
+ // AliPythia and children are tracked by GEANT
+ //
+ // if fForceDecay == none Primary particle is tracked by GEANT
+ // (In the latest, make sure that GEANT actually does all the decays you want)
+ //
+
+ if (fForceDecay != kNoDecay) {
+ // Using lujet to decay particle
+ Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
+ TLorentzVector pmom(p[0], p[1], p[2], energy);
+ fDecayer->Decay(iPart,&pmom);
+ //
+ // select decay particles
+ Int_t np=fDecayer->ImportParticles(particles);
+
+ // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut;
+ if (fGeometryAcceptance)
+ if (!CheckAcceptanceGeometry(np,particles)) continue;
+ Int_t ncsel=0;
+ Int_t* pFlag = new Int_t[np];
+ Int_t* pParent = new Int_t[np];
+ Int_t* pSelected = new Int_t[np];
+ Int_t* trackIt = new Int_t[np];
+
+ for (i=0; i<np; i++) {
+ pFlag[i] = 0;
+ pSelected[i] = 0;
+ pParent[i] = -1;
+ }
+
+ if (np >1) {
+ TParticle* iparticle = (TParticle *) particles->At(0);
+ Int_t ipF, ipL;
+ for (i = 1; i<np ; i++) {
+ trackIt[i] = 1;
+ iparticle = (TParticle *) particles->At(i);
+ Int_t kf = iparticle->GetPdgCode();
+ Int_t ks = iparticle->GetStatusCode();
+ // flagged particle
+
+ if (pFlag[i] == 1) {
+ ipF = iparticle->GetFirstDaughter();
+ ipL = iparticle->GetLastDaughter();
+ if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
+ continue;
+ }
+
+ // flag decay products of particles with long life-time (c tau > .3 mum)
+
+ if (ks != 1) {
+ //TParticlePDG *particle = pDataBase->GetParticle(kf);
+
+ Double_t lifeTime = fDecayer->GetLifetime(kf);
+ //Double_t mass = particle->Mass();
+ //Double_t width = particle->Width();
+ if (lifeTime > (Double_t) fMaxLifeTime) {
+ ipF = iparticle->GetFirstDaughter();
+ ipL = iparticle->GetLastDaughter();
+ if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
+ } else {
+ trackIt[i] = 0;
+ pSelected[i] = 1;
}
+ } // ks==1 ?
+ //
+ // children
+
+ if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll) && trackIt[i])
+ {
+ if (fCutOnChild) {
+ pc[0]=iparticle->Px();
+ pc[1]=iparticle->Py();
+ pc[2]=iparticle->Pz();
+ Bool_t childok = KinematicSelection(iparticle, 1);
+ if(childok) {
+ pSelected[i] = 1;
+ ncsel++;
+ } else {
+ ncsel=-1;
+ break;
+ } // child kine cuts
+ } else {
+ pSelected[i] = 1;
+ ncsel++;
+ } // if child selection
+ } // select muon
+ } // decay particle loop
+ } // if decay products
+
+ Int_t iparent;
+ if ((fCutOnChild && ncsel >0) || !fCutOnChild){
+ ipa++;
+ //
+ // Parent
+ // quark
+ PushTrack(0, -1, iquark[ihad], pq[ihad], origin0, polar, 0, kPPrimary, nt, wgtp);
+ KeepTrack(nt);
+ ntq[ihad] = nt;
+ // hadron
+ PushTrack(0, ntq[ihad], iPart, p, origin0, polar, 0, kPDecay, nt, wgtp);
+ pParent[0] = nt;
+ KeepTrack(nt);
+ fNprimaries++;
+
+ //
+ // Decay Products
+ //
+ for (i = 1; i < np; i++) {
+ if (pSelected[i]) {
+ TParticle* iparticle = (TParticle *) particles->At(i);
+ Int_t kf = iparticle->GetPdgCode();
+ Int_t jpa = iparticle->GetFirstMother()-1;
- if (np >1) {
- TParticle* iparticle = (TParticle *) particles->At(0);
- for (i=1; i<np; i++) {
- trackIt[i] = 1;
- iparticle = (TParticle *) particles->At(i);
- Int_t kf = iparticle->GetPdgCode();
- Int_t ks = iparticle->GetStatusCode();
-
-// particles with long life-time (c tau > .3 mum)
- if (ks != 1) {
- Double_t lifeTime = fDecayer->GetLifetime(kf);
- if (lifeTime <= (Double_t) fMaxLifeTime) {
- trackIt[i] = 0;
- pSelected[i] = 1;
- }
- } // ks==1 ?
-//
-// children, discard neutrinos
- if (TMath::Abs(kf) == 12 || TMath::Abs(kf) == 14) continue;
- if (trackIt[i])
- {
- if (fCutOnChild) {
- pc[0]=iparticle->Px();
- pc[1]=iparticle->Py();
- pc[2]=iparticle->Pz();
- Bool_t childok = KinematicSelection(iparticle, 1);
- if(childok) {
- pSelected[i] = 1;
- ncsel++;
- } else {
- ncsel=-1;
- break;
- } // child kine cuts
- } else {
- pSelected[i] = 1;
- ncsel++;
- } // if child selection
- } // select muon
- } // decay particle loop
- } // if decay products
+ och[0] = origin0[0]+iparticle->Vx()/10;
+ och[1] = origin0[1]+iparticle->Vy()/10;
+ och[2] = origin0[2]+iparticle->Vz()/10;
+ pc[0] = iparticle->Px();
+ pc[1] = iparticle->Py();
+ pc[2] = iparticle->Pz();
- Int_t iparent;
- if ((fCutOnChild && ncsel >0) || !fCutOnChild){
-
- nhadron++;
-//
-// Parents and Decay Products
- if (ipair == 0) {
- np1 = np;
- wgtch1 = wgtch;
- p1[0] = p[0]; p1[1] = p[1]; p1[2] = p[2];
- } else {
- ipap++;
- PushTrack(0, -1, ihadron[0], p1, origin0, polar, 0,
- kPPrimary, nt, wgtp);
- KeepTrack(nt);
- for (i = 1; i < np1; i++) {
- if (select1[i]) {
- for (j=0; j<3; j++) {
- och[j] = och1[i][j];
- pc[j] = pc1[i][j];
- }
- PushTrack(fTrackIt*trackIt1[i], iparent1[i], kf1[i], pc, och,
- polar, 0, kPDecay, nt, wgtch1);
- KeepTrack(nt);
- }
- }
- PushTrack(0, -1, iPart, p, origin0, polar, 0, kPPrimary, nt, wgtp);
- KeepTrack(nt);
- }
- pParent[0] = nt;
-//
-// Decay Products
- Int_t ntcount = 0;
- for (i = 1; i < np; i++) {
- if (pSelected[i]) {
- TParticle* iparticle = (TParticle *) particles->At(i);
- Int_t kf = iparticle->GetPdgCode();
- Int_t ipa = iparticle->GetFirstMother()-1;
-
- och[0] = origin0[0]+iparticle->Vx()/10;
- och[1] = origin0[1]+iparticle->Vy()/10;
- och[2] = origin0[2]+iparticle->Vz()/10;
- pc[0] = iparticle->Px();
- pc[1] = iparticle->Py();
- pc[2] = iparticle->Pz();
-
- if (ipa > -1) {
- iparent = pParent[ipa];
- } else {
- iparent = -1;
- }
-
- if (ipair == 0) {
- kf1[i] = kf;
- select1[i] = pSelected[i];
- iparent1[i] = iparent;
- trackIt1[i] = trackIt[i];
- for (j=0; j<3; j++) {
- och1[i][j] = och[j];
- pc1[i][j] = pc[j];
- }
- ntcount++;
- } else {
- PushTrack(fTrackIt*trackIt[i], iparent, kf, pc, och,
- polar, 0, kPDecay, nt, wgtch);
- KeepTrack(nt);
- }
- pParent[i] = nt + ntcount;
- } // Selected
- } // Particle loop
- } // Decays by Lujet
- particles->Clear();
- if (pParent) delete[] pParent;
- if (pSelected) delete[] pSelected;
- if (trackIt) delete[] trackIt;
- } // kinematic selection
- else // nodecay option, so parent will be tracked by GEANT
- {
- nhadron++;
- if (ipair == 0) {
- p1[0] = p[0]; p1[1] = p[1]; p1[2] = p[2];
- } else {
- ipap++;
- gAlice->GetMCApp()->
- PushTrack(fTrackIt,-1,ihadron[0],p1,origin0,polar,0,kPPrimary,nt,wgtp);
- gAlice->GetMCApp()->
- PushTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp);
- }
- }
- if (nhadron == 0) break;
- } // ipair loop
- if (nhadron != 2) continue;
+ if (jpa > -1) {
+ iparent = pParent[jpa];
+ } else {
+ iparent = -1;
+ }
+
+ PushTrack(fTrackIt*trackIt[i], iparent, kf,
+ pc, och, polar,
+ 0, kPDecay, nt, wgtch);
+ pParent[i] = nt;
+ KeepTrack(nt);
+ fNprimaries++;
+ } // Selected
+ } // Particle loop
+ } // Decays by Lujet
+ particles->Clear();
+ if (pFlag) delete[] pFlag;
+ if (pParent) delete[] pParent;
+ if (pSelected) delete[] pSelected;
+ if (trackIt) delete[] trackIt;
+ } // kinematic selection
+ else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons)
+ {
+ gAlice->GetMCApp()->
+ PushTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp);
+ ipa++;
+ fNprimaries++;
+ }
break;
- } // while(1)
- nt++;
- } // while(ipa<fNpart) --> event loop
+ } // while(1) loop
+ } // hadron pair loop
+ } // while (ipa<2*fNpart) loop
SetHighWaterMark(nt);
-}
+
+ AliGenEventHeader* header = new AliGenEventHeader("CorrHF");
+ header->SetPrimaryVertex(fVertex);
+ header->SetNProduced(fNprimaries);
+ AddHeader(header);
-//____________________________________________________________________________________
-AliGenCorrHF& AliGenCorrHF::operator=(const AliGenCorrHF& rhs)
-{
-// Assignment operator
- rhs.Copy(*this);
- return *this;
}
-
//____________________________________________________________________________________
-Int_t AliGenCorrHF::IpCharm(TRandom* ran)
+void AliGenCorrHF::IpCharm(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4)
{
-// Composition of lower state charm hadrons, containing a c-quark
- Float_t random;
- Int_t ip; // +- 411,421,431,4122,4132,4232,4332
- random = ran->Rndm();
-// Rates from Pythia6.214 using 100Kevents with kPyCharmppMNRwmi at 14 TeV.
-
- if (random < 0.6027) {
- ip=421;
- } else if (random < 0.7962) {
- ip=411;
- } else if (random < 0.9127) {
- ip=431;
- } else if (random < 0.9899) {
- ip=4122;
- } else if (random < 0.9948) {
- ip=4132;
- } else if (random < 0.9999) {
- ip=4232;
- } else {
- ip=4332;
- }
-
- return ip;
+// Composition of a lower state charm hadron pair from a ccbar quark pair
+ Int_t pdgH[] = {411, 421, 431, 4122, 4132, 4232, 4332};
+
+ Double_t id3, id4;
+ hProbHH->GetRandom2(id3, id4);
+ pdg3 = pdgH[(Int_t)TMath::Floor(id3)];
+ pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)];
+
+ return;
}
-Int_t AliGenCorrHF::IpBeauty(TRandom* ran)
+void AliGenCorrHF::IpBeauty(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4)
{
-// Composition of lower state beauty hadrons, containing a b-quark
- Float_t random;
- Int_t ip; // +- 511,521,531,5122,5132,5232,5332
- random = ran->Rndm();
-// Rates from Pythia6.214 using 100Kevents with kPyBeautyppMNRwmi at 14 TeV.
- // B-Bbar mixing will be done by Pythia at the decay point
- if (random < 0.3965) {
- ip=-511;
- } else if (random < 0.7930) {
- ip=-521;
- } else if (random < 0.9112) {
- ip=-531;
- } else if (random < 0.9887) {
- ip=5122;
- } else if (random < 0.9943) {
- ip=5132;
- } else if (random < 0.9999) {
- ip=5232;
- } else {
- ip=5332;
- }
-
- return ip;
+// Composition of a lower state beauty hadron pair from a bbbar quark pair
+ // B-Bbar mixing will be done by Pythia at their decay point
+ Int_t pdgH[] = {511, 521, 531, 5122, 5132, 5232, 5332};
+
+ Double_t id3, id4;
+ hProbHH->GetRandom2(id3, id4);
+ pdg3 = pdgH[(Int_t)TMath::Floor(id3)];
+ pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)];
+
+ if ( (pdg3== 511) || (pdg3== 521) || (pdg3== 531) ) pdg3 *= -1;
+ if ( (pdg4==-511) || (pdg4==-521) || (pdg4==-531) ) pdg4 *= -1;
+
+ return;
}
//____________________________________________________________________________________
Double_t AliGenCorrHF::ComputeIntegral(TFile* fG) // needed by GetQuarkPair
{
// Read QQbar kinematical 5D grid's cell occupancy weights
- Int_t* cell = new Int_t[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph}
+ Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph}
TTree* tG = (TTree*) fG->Get("tGqq");
- tG->GetBranch("cell")->SetAddress(cell);
+ tG->GetBranch("cell")->SetAddress(&cell);
Int_t nbins = tG->GetEntries();
// delete previously computed integral (if any)
// modification of ROOT's TH3::GetRandom3 for 5D
{
// Read QQbar kinematical 5D grid's cell coordinates
- Int_t* cell = new Int_t[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph}
+ Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph}
TTree* tG = (TTree*) fG->Get("tGqq");
- tG->GetBranch("cell")->SetAddress(cell);
+ tG->GetBranch("cell")->SetAddress(&cell);
Int_t nbins = tG->GetEntries();
Double_t rand[6];
gRandom->RndmArray(6,rand);
void AliGenCorrHF::GetHadronPair(TFile* fG, Int_t idq, Double_t y1, Double_t y2, Double_t pt1, Double_t pt2, Int_t &id3, Int_t &id4, Double_t &pz3, Double_t &pz4, Double_t &pt3, Double_t &pt4)
{
// Generate a hadron pair
- Int_t (*fIpParaFunc )(TRandom*);//Pointer to particle type parametrisation function
+ void (*fIpParaFunc)(TH2F *, Int_t &, Int_t &);//Pointer to hadron pair composition function
fIpParaFunc = IpCharm;
Double_t mq = 1.2; // c & b quark masses (used in AliPythia)
if (idq == 5) {
}
Double_t z11, z12, z21, z22, pz1, pz2, e1, e2, mh, ptemp, rand[2];
char tag[100];
- TH2F *h2h[12], *h2s[12]; // hard & soft Fragmentation Functions
+ TH2F *h2h[12], *h2s[12], *hProbHH; // hard & soft fragmentation and HH-probability functions
for (Int_t ipt = 0; ipt<fgnptbins; ipt++) {
sprintf(tag,"h2h_pt%d",ipt);
h2h[ipt] = (TH2F*) fG->Get(tag);
pz2 = ptemp*TMath::SinH(y2);
e2 = ptemp*TMath::CosH(y2);
- id3 = fIpParaFunc(gRandom);
+ hProbHH = (TH2F*)fG->Get("hProbHH");
+ fIpParaFunc(hProbHH, id3, id4);
mh = TDatabasePDG::Instance()->GetParticle(id3)->Mass();
ptemp = z11*z21*(e1*e1-pz1*pz1) - mh*mh;
- pt3 = (idq-3)*rand[0]; // some smearing at low pt, try better
+ if (idq==5) pt3 = pt1; // an approximation at low pt, try better
+ else pt3 = rand[0]; // pt3=pt1 gives less D-hadrons at low pt
if (ptemp > 0) pt3 = TMath::Sqrt(ptemp);
if (pz1 > 0) pz3 = (z11*(e1 + pz1) - z21*(e1 - pz1)) / 2;
else pz3 = (z21*(e1 + pz1) - z11*(e1 - pz1)) / 2;
e1 = TMath::Sqrt(pz3*pz3 + pt3*pt3 + mh*mh);
- id4 = - fIpParaFunc(gRandom);
mh = TDatabasePDG::Instance()->GetParticle(id4)->Mass();
ptemp = z12*z22*(e2*e2-pz2*pz2) - mh*mh;
- pt4 = (idq-3)*rand[1]; // some smearing at low pt, try better
+ if (idq==5) pt4 = pt2; // an approximation at low pt, try better
+ else pt4 = rand[1];
if (ptemp > 0) pt4 = TMath::Sqrt(ptemp);
if (pz2 > 0) pz4 = (z12*(e2 + pz2) - z22*(e2 - pz2)) / 2;
else pz4 = (z22*(e2 + pz2) - z12*(e2 - pz2)) / 2;
y3 = 0.5 * TMath::Log((e1 + pz3 + 1.e-13)/(e1 - pz3 + 1.e-13));
y4 = 0.5 * TMath::Log((e2 + pz4 + 1.e-13)/(e2 - pz4 + 1.e-13));
if(TMath::Abs(y3)<ycorr && TMath::Abs(y4)<ycorr && rand[0]>0.5) {
- ptemp = TMath::Sqrt(e1*e1 - pz3*pz3);
+ ptemp = TMath::Sqrt((e1-pz3)*(e1+pz3));
y3 = 4*(1 - 2*rand[1]);
pz3 = ptemp*TMath::SinH(y3);
pz4 = pz3;
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff