// 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 in p-p collisions at 10 and 14 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)
//-------------------------------------------------------------------------
-// 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
+ // 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
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 == 10)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Beautypp10MNRwmiCorr.root";
+ else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Beautypp14MNRwmiCorr.root";
+ }
+ else {
+ fQuark = 4;
+ if (fEnergy == 10)
+ fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Charmpp10MNRwmiCorr.root";
+ else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/Charmpp14MNRwmiCorr.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";
// Calculating vertex position per event
for (j=0;j<3;j++) origin0[j]=fOrigin[j];
- if(fVertexSmear==kPerEvent) {
+ if (fVertexSmear==kPerEvent) {
Vertex();
for (j=0;j<3;j++) origin0[j]=fVertex[j];
}
// Cut on theta
theta=TMath::ATan2(pth[0],plh[0]);
- if(theta<fThetaMin || theta>fThetaMax) continue;
+ if (theta<fThetaMin || theta>fThetaMax) continue;
theta=TMath::ATan2(pth[1],plh[1]);
- if(theta<fThetaMin || theta>fThetaMax) continue;
+ if (theta<fThetaMin || theta>fThetaMax) continue;
// Cut on momentum
ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]);
ipF = iparticle->GetFirstDaughter();
ipL = iparticle->GetLastDaughter();
if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
- } else{
+ } else {
trackIt[i] = 0;
pSelected[i] = 1;
}
//
// children
- if (ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll && trackIt[i])
+ if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll) && trackIt[i])
{
if (fCutOnChild) {
pc[0]=iparticle->Px();
id3 = fIpParaFunc(gRandom);
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];
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;
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;
git://git.uio.no / u / mrichter / AliRoot.git / blobdiff