1 /**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
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12 * about the suitability of this software for any purpose. It is *
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14 **************************************************************************/
18 // Class to generate correlated Heavy Flavor hadron pairs (one or several pairs
19 // per event) using paramtrized kinematics of quark pairs from some generator
20 // and quark fragmentation functions.
21 // Is a generalisation of AliGenParam class for correlated pairs of hadrons.
22 // In this version quark pairs and fragmentation functions are obtained from
23 // ~2.10^6 Pythia6.214 events generated with kCharmppMNRwmi & kBeautyppMNRwmi,
24 // CTEQ5L PDF and Pt_hard = 2.76 GeV/c for p-p collisions at 7, 10 and 14 TeV,
25 // and with kCharmppMNR (Pt_hard = 2.10 GeV/c) & kBeautyppMNR (Pt_hard = 2.75 GeV/c),
26 // CTEQ4L PDF for Pb-Pb at 3.94 TeV, for p-Pb & Pb-p at 8.8 TeV.
27 // Decays are performed by Pythia.
28 // Author: S. Grigoryan, LPC Clermont-Fd & YerPhI, Smbat.Grigoryan@cern.ch
29 // July 07: added quarks in the stack (B. Vulpescu)
30 // April 09: added energy choice between 10 and 14 TeV (S. Grigoryan)
31 // Sept 09: added hadron pair composition probabilities via 2D histo (X.M. Zhang)
32 // Oct 09: added energy choice between 7, 10, 14 TeV (for p-p), 4 TeV (for Pb-Pb),
33 // 9 TeV (for p-Pb) and -9 TeV (for Pb-p) (S. Grigoryan)
34 // April 10: removed "static" from definition of some variables (B. Vulpescu)
35 //-------------------------------------------------------------------------
36 // How it works (for the given flavor and p-p energy):
38 // 1) Reads QQbar kinematical grid (TTree) from the Input file and generates
39 // quark pairs according to the weights of the cells.
40 // It is a 5D grid in y1,y2,pt1,pt2 and deltaphi, with occupancy weights
41 // of the cells obtained from Pythia (see details in GetQuarkPair).
42 // 2) Reads "soft" and "hard" fragmentation functions (12 2D-histograms each,
43 // for 12 pt bins) from the Input file, applies to quarks and produces hadrons
44 // (only lower states, with proportions of species obtained from Pythia).
45 // Fragmentation functions are the same for all hadron species and depend
46 // on 2 variables - light cone energy-momentum fractions:
47 // z1=(E_H + Pz_H)/(E_Q + Pz_Q), z2=(E_H - Pz_H)/(E_Q - Pz_Q).
48 // "soft" & "hard" FFs correspond to "slower" & "faster" quark of a pair
49 // (see details in GetHadronPair). Fragmentation does not depend on p-p energy.
50 // 3) Decays the hadrons and saves all the particles in the event stack in the
51 // following order: HF hadron from Q, then its decay products, then HF hadron
52 // from Qbar, then its decay productes, then next HF hadon pair (if any)
53 // in the same way, etc...
54 // 4) It is fast, e.g., generates the same number of events with a beauty pair
55 // ~15 times faster than AliGenPythia with kBeautyppMNRwmi (w/o tracking)
57 // An Input file for each quark flavor and p-p energy is in EVGEN/dataCorrHF/
58 // One can use also user-defined Input files.
60 // More details could be found in my presentation at DiMuonNet Workshop, Dec 2006:
61 // http://www-dapnia.cea.fr/Sphn/Alice/DiMuonNet.
63 //-------------------------------------------------------------------------
66 // add the following typical lines in Config.C
68 if (!strcmp(option,"corr")) {
69 // An example for correlated charm or beauty hadron pair production at 14 TeV
71 // AliGenCorrHF *gener = new AliGenCorrHF(1, 4, 14); // for charm, 1 pair per event
72 AliGenCorrHF *gener = new AliGenCorrHF(1, 5, 14); // for beauty, 1 pair per event
74 gener->SetMomentumRange(0,9999);
75 gener->SetCutOnChild(0); // 1/0 means cuts on children enable/disable
76 gener->SetChildThetaRange(171.0,178.0);
77 gener->SetOrigin(0,0,0); //vertex position
78 gener->SetSigma(0,0,0); //Sigma in (X,Y,Z) (cm) on IP position
79 gener->SetForceDecay(kSemiMuonic);
80 gener->SetTrackingFlag(0);
84 // and in aliroot do e.g. gAlice->Run(10,"Config.C") to produce 10 events.
85 // One can include AliGenCorrHF in an AliGenCocktail generator.
86 //--------------------------------------------------------------------------
88 #include <Riostream.h>
90 #include <TClonesArray.h>
91 #include <TDatabasePDG.h>
94 #include <TLorentzVector.h>
96 #include <TParticle.h>
97 #include <TParticlePDG.h>
101 #include <TVirtualMC.h>
102 #include <TVector3.h>
104 #include "AliGenCorrHF.h"
106 #include "AliConst.h"
107 #include "AliDecayer.h"
110 #include "AliGenEventHeader.h"
112 ClassImp(AliGenCorrHF)
116 <img src="picts/AliGenCorrHF.gif">
120 Double_t AliGenCorrHF::fgdph[19] = {0, 10, 20, 30, 40, 50, 60, 70, 80, 90, 100, 110, 120, 130, 140, 150, 160, 170, 180};
121 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};
122 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};
123 Int_t AliGenCorrHF::fgnptbins = 12;
124 Double_t AliGenCorrHF::fgptbmin[12] = {0, 0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9};
125 Double_t AliGenCorrHF::fgptbmax[12] = {0.5, 1, 1.5, 2, 2.5, 3, 4, 5, 6, 7, 9, 100};
127 //____________________________________________________________
128 AliGenCorrHF::AliGenCorrHF():
138 // Default constructor
141 //____________________________________________________________
142 AliGenCorrHF::AliGenCorrHF(Int_t npart, Int_t idquark, Int_t energy):
150 // fDecayer(new AliDecayerPythia())
154 // Constructor using particle number, quark type, energy & default InputFile
158 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP7PythiaMNRwmi.root";
159 else if (fEnergy == 10)
160 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP10PythiaMNRwmi.root";
161 else if (fEnergy == 14)
162 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPP14PythiaMNRwmi.root";
163 else if (fEnergy == 4)
164 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root";
165 else if (fEnergy == 9 || fEnergy == -9)
166 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPPb88PythiaMNR.root";
167 else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/BeautyPbPb394PythiaMNR.root";
172 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP7PythiaMNRwmi.root";
173 else if (fEnergy == 10)
174 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP10PythiaMNRwmi.root";
175 else if (fEnergy == 14)
176 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPP14PythiaMNRwmi.root";
177 else if (fEnergy == 4)
178 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root";
179 else if (fEnergy == 9 || fEnergy == -9)
180 fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPPb88PythiaMNR.root";
181 else fFileName = "$ALICE_ROOT/EVGEN/dataCorrHF/CharmPbPb394PythiaMNR.root";
184 fTitle= "Generator for correlated pairs of HF hadrons";
187 for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
190 SetChildMomentumRange();
193 SetChildThetaRange();
196 //___________________________________________________________________
197 AliGenCorrHF::AliGenCorrHF(char* tname, Int_t npart, Int_t idquark, Int_t energy):
205 // fDecayer(new AliDecayerPythia())
209 // Constructor using particle number, quark type, energy & user-defined InputFile
211 if (fQuark != 5) fQuark = 4;
212 fName = "UserDefined";
213 fTitle= "Generator for correlated pairs of HF hadrons";
216 for (Int_t i=0; i<5; i++) fChildSelect[i]=0;
219 SetChildMomentumRange();
222 SetChildThetaRange();
225 //____________________________________________________________
226 AliGenCorrHF::~AliGenCorrHF()
232 //____________________________________________________________
233 void AliGenCorrHF::Init()
237 AliInfo(Form(" QQbar kinematics and fragm. functions from: %s",fFileName.Data() ));
238 fFile = TFile::Open(fFileName.Data());
239 if(!fFile->IsOpen()){
240 AliError(Form("Could not open file %s",fFileName.Data() ));
243 ComputeIntegral(fFile);
245 fParentWeight = 1./fNpart; // fNpart is number of HF-hadron pairs
247 // particle decay related initialization
249 if (gMC) fDecayer = gMC->GetDecayer();
250 fDecayer->SetForceDecay(fForceDecay);
256 //____________________________________________________________
257 void AliGenCorrHF::Generate()
260 // Generate fNpart of correlated HF hadron pairs per event
261 // in the the desired theta and momentum windows (phi = 0 - 2pi).
264 // Reinitialize decayer
266 fDecayer->SetForceDecay(fForceDecay);
270 Float_t polar[3]= {0,0,0}; // Polarisation of the parent particle (for GEANT tracking)
271 Float_t origin0[3]; // Origin of the generated parent particle (for GEANT tracking)
272 Float_t pt, pl, ptot; // Transverse, logitudinal and total momenta of the parent particle
273 Float_t phi, theta; // Phi and theta spherical angles of the parent particle momentum
274 Float_t p[3], pc[3], och[3];// Momentum, polarisation and origin of the children particles from lujet
275 Int_t nt, i, j, ipa, ihadron[2], iquark[2];
276 Float_t wgtp, wgtch, random[6];
277 Float_t pq[2][3]; // Momenta of the two quarks
278 Int_t ntq[2] = {-1, -1};
279 Double_t tanhy2, qm = 0;
281 Double_t dphi=0, ptq[2], yq[2], pth[2], plh[2], ph[2], phih[2], phiq[2];
282 for (i=0; i<2; i++) {
293 // same quarks mass as in the fragmentation functions
294 if (fQuark == 4) qm = 1.20;
297 TClonesArray *particles = new TClonesArray("TParticle",1000);
299 TDatabasePDG *pDataBase = TDatabasePDG::Instance();
302 // Calculating vertex position per event
303 for (j=0;j<3;j++) origin0[j]=fOrigin[j];
304 if (fVertexSmear==kPerEvent) {
306 for (j=0;j<3;j++) origin0[j]=fVertex[j];
311 // Generating fNpart HF-hadron pairs
314 while (ipa<2*fNpart) {
316 GetQuarkPair(fFile, fgIntegral, yq[0], yq[1], ptq[0], ptq[1], dphi);
318 GetHadronPair(fFile, fQuark, yq[0], yq[1], ptq[0], ptq[1], ihadron[0], ihadron[1], plh[0], plh[1], pth[0], pth[1]);
320 if (fEnergy == 9 || fEnergy == -9) { // boost particles from c.m.s. to ALICE lab frame
321 Double_t dyBoost = 0.47;
322 Double_t beta = TMath::TanH(dyBoost);
323 Double_t gamma = 1./TMath::Sqrt((1.-beta)*(1.+beta));
324 Double_t gb = gamma * beta;
327 plh[0] = gb * TMath::Sqrt(plh[0]*plh[0] + pth[0]*pth[0]) + gamma * plh[0];
328 plh[1] = gb * TMath::Sqrt(plh[1]*plh[1] + pth[1]*pth[1]) + gamma * plh[1];
337 // Cuts from AliGenerator
340 theta=TMath::ATan2(pth[0],plh[0]);
341 if (theta<fThetaMin || theta>fThetaMax) continue;
342 theta=TMath::ATan2(pth[1],plh[1]);
343 if (theta<fThetaMin || theta>fThetaMax) continue;
346 ph[0]=TMath::Sqrt(pth[0]*pth[0]+plh[0]*plh[0]);
347 if (ph[0]<fPMin || ph[0]>fPMax) continue;
348 ph[1]=TMath::Sqrt(pth[1]*pth[1]+plh[1]*plh[1]);
349 if (ph[1]<fPMin || ph[1]>fPMax) continue;
351 // Add the quarks in the stack
353 phiq[0] = Rndm()*k2PI;
355 phiq[1] = phiq[0] + dphi*kDegrad;
357 phiq[1] = phiq[0] - dphi*kDegrad;
359 if (phiq[1] > k2PI) phiq[1] -= k2PI;
360 if (phiq[1] < 0 ) phiq[1] += k2PI;
367 TVector2 qvect1 = TVector2();
368 TVector2 qvect2 = TVector2();
369 qvect1.SetMagPhi(ptq[0],phiq[0]);
370 qvect2.SetMagPhi(ptq[1],phiq[1]);
371 pq[0][0] = qvect1.Px();
372 pq[0][1] = qvect1.Py();
373 pq[1][0] = qvect2.Px();
374 pq[1][1] = qvect2.Py();
377 tanhy2 = TMath::TanH(yq[0]);
379 pq[0][2] = TMath::Sqrt((ptq[0]*ptq[0]+qm*qm)*tanhy2/(1-tanhy2));
380 pq[0][2] = TMath::Sign((Double_t)pq[0][2],yq[0]);
381 tanhy2 = TMath::TanH(yq[1]);
383 pq[1][2] = TMath::Sqrt((ptq[1]*ptq[1]+qm*qm)*tanhy2/(1-tanhy2));
384 pq[1][2] = TMath::Sign((Double_t)pq[1][2],yq[1]);
386 // Here we assume that |phi_H1 - phi_H2| = |phi_Q1 - phi_Q2| = dphi
387 // which is a good approximation for heavy flavors in Pythia
388 // ... moreover, same phi angles as for the quarks ...
393 for (Int_t ihad = 0; ihad < 2; ihad++) {
397 Int_t iPart = ihadron[ihad];
398 fChildWeight=(fDecayer->GetPartialBranchingRatio(iPart))*fParentWeight;
401 TParticlePDG *particle = pDataBase->GetParticle(iPart);
402 Float_t am = particle->Mass();
406 ptot=TMath::Sqrt(pt*pt+pl*pl);
408 p[0]=pt*TMath::Cos(phi);
409 p[1]=pt*TMath::Sin(phi);
412 if(fVertexSmear==kPerTrack) {
416 fOrigin[j]+fOsigma[j]*TMath::Cos(2*random[2*j]*TMath::Pi())*
417 TMath::Sqrt(-2*TMath::Log(random[2*j+1]));
421 // Looking at fForceDecay :
422 // if fForceDecay != none Primary particle decays using
423 // AliPythia and children are tracked by GEANT
425 // if fForceDecay == none Primary particle is tracked by GEANT
426 // (In the latest, make sure that GEANT actually does all the decays you want)
429 if (fForceDecay != kNoDecay) {
430 // Using lujet to decay particle
431 Float_t energy=TMath::Sqrt(ptot*ptot+am*am);
432 TLorentzVector pmom(p[0], p[1], p[2], energy);
433 fDecayer->Decay(iPart,&pmom);
435 // select decay particles
436 Int_t np=fDecayer->ImportParticles(particles);
438 // Selecting GeometryAcceptance for particles fPdgCodeParticleforAcceptanceCut;
439 if (fGeometryAcceptance)
440 if (!CheckAcceptanceGeometry(np,particles)) continue;
442 Int_t* pFlag = new Int_t[np];
443 Int_t* pParent = new Int_t[np];
444 Int_t* pSelected = new Int_t[np];
445 Int_t* trackIt = new Int_t[np];
447 for (i=0; i<np; i++) {
454 TParticle* iparticle = (TParticle *) particles->At(0);
456 for (i = 1; i<np ; i++) {
458 iparticle = (TParticle *) particles->At(i);
459 Int_t kf = iparticle->GetPdgCode();
460 Int_t ks = iparticle->GetStatusCode();
464 ipF = iparticle->GetFirstDaughter();
465 ipL = iparticle->GetLastDaughter();
466 if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
470 // flag decay products of particles with long life-time (c tau > .3 mum)
473 //TParticlePDG *particle = pDataBase->GetParticle(kf);
475 Double_t lifeTime = fDecayer->GetLifetime(kf);
476 //Double_t mass = particle->Mass();
477 //Double_t width = particle->Width();
478 if (lifeTime > (Double_t) fMaxLifeTime) {
479 ipF = iparticle->GetFirstDaughter();
480 ipL = iparticle->GetLastDaughter();
481 if (ipF > 0) for (j=ipF-1; j<ipL; j++) pFlag[j]=1;
490 if ((ChildSelected(TMath::Abs(kf)) || fForceDecay == kAll) && trackIt[i])
493 pc[0]=iparticle->Px();
494 pc[1]=iparticle->Py();
495 pc[2]=iparticle->Pz();
496 Bool_t childok = KinematicSelection(iparticle, 1);
507 } // if child selection
509 } // decay particle loop
510 } // if decay products
513 if ((fCutOnChild && ncsel >0) || !fCutOnChild){
518 PushTrack(0, -1, iquark[ihad], pq[ihad], origin0, polar, 0, kPPrimary, nt, wgtp);
522 PushTrack(0, ntq[ihad], iPart, p, origin0, polar, 0, kPDecay, nt, wgtp);
530 for (i = 1; i < np; i++) {
532 TParticle* iparticle = (TParticle *) particles->At(i);
533 Int_t kf = iparticle->GetPdgCode();
534 Int_t jpa = iparticle->GetFirstMother()-1;
536 och[0] = origin0[0]+iparticle->Vx()/10;
537 och[1] = origin0[1]+iparticle->Vy()/10;
538 och[2] = origin0[2]+iparticle->Vz()/10;
539 pc[0] = iparticle->Px();
540 pc[1] = iparticle->Py();
541 pc[2] = iparticle->Pz();
544 iparent = pParent[jpa];
549 PushTrack(fTrackIt*trackIt[i], iparent, kf,
551 0, kPDecay, nt, wgtch);
559 if (pFlag) delete[] pFlag;
560 if (pParent) delete[] pParent;
561 if (pSelected) delete[] pSelected;
562 if (trackIt) delete[] trackIt;
563 } // kinematic selection
564 else // nodecay option, so parent will be tracked by GEANT (pions, kaons, eta, omegas, baryons)
567 PushTrack(fTrackIt,-1,iPart,p,origin0,polar,0,kPPrimary,nt,wgtp);
573 } // hadron pair loop
574 } // while (ipa<2*fNpart) loop
576 SetHighWaterMark(nt);
578 AliGenEventHeader* header = new AliGenEventHeader("CorrHF");
579 header->SetPrimaryVertex(fVertex);
580 header->SetNProduced(fNprimaries);
586 //____________________________________________________________________________________
587 void AliGenCorrHF::IpCharm(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4)
589 // Composition of a lower state charm hadron pair from a ccbar quark pair
590 Int_t pdgH[] = {411, 421, 431, 4122, 4132, 4232, 4332};
593 hProbHH->GetRandom2(id3, id4);
594 pdg3 = pdgH[(Int_t)TMath::Floor(id3)];
595 pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)];
600 void AliGenCorrHF::IpBeauty(TH2F *hProbHH, Int_t &pdg3, Int_t &pdg4)
602 // Composition of a lower state beauty hadron pair from a bbbar quark pair
603 // B-Bbar mixing will be done by Pythia at their decay point
604 Int_t pdgH[] = {511, 521, 531, 5122, 5132, 5232, 5332};
607 hProbHH->GetRandom2(id3, id4);
608 pdg3 = pdgH[(Int_t)TMath::Floor(id3)];
609 pdg4 = -1*pdgH[(Int_t)TMath::Floor(id4)];
611 if ( (pdg3== 511) || (pdg3== 521) || (pdg3== 531) ) pdg3 *= -1;
612 if ( (pdg4==-511) || (pdg4==-521) || (pdg4==-531) ) pdg4 *= -1;
617 //____________________________________________________________________________________
618 Double_t AliGenCorrHF::ComputeIntegral(TFile* fG) // needed by GetQuarkPair
620 // Read QQbar kinematical 5D grid's cell occupancy weights
621 Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph}
622 TTree* tG = (TTree*) fG->Get("tGqq");
623 tG->GetBranch("cell")->SetAddress(&cell);
624 Int_t nbins = tG->GetEntries();
626 // delete previously computed integral (if any)
627 if(fgIntegral) delete [] fgIntegral;
629 fgIntegral = new Double_t[nbins+1];
632 for(bin=0;bin<nbins;bin++) {
634 fgIntegral[bin+1] = fgIntegral[bin] + cell[0];
636 // Normalize integral to 1
637 if (fgIntegral[nbins] == 0 ) {
640 for (bin=1;bin<=nbins;bin++) fgIntegral[bin] /= fgIntegral[nbins];
642 return fgIntegral[nbins];
645 //____________________________________________________________________________________
646 void AliGenCorrHF::GetQuarkPair(TFile* fG, Double_t* fInt, Double_t &y1, Double_t &y2, Double_t &pt1, Double_t &pt2, Double_t &dphi)
647 // modification of ROOT's TH3::GetRandom3 for 5D
649 // Read QQbar kinematical 5D grid's cell coordinates
650 Int_t cell[6]; // cell[6]={wght,iy1,iy2,ipt1,ipt2,idph}
651 TTree* tG = (TTree*) fG->Get("tGqq");
652 tG->GetBranch("cell")->SetAddress(&cell);
653 Int_t nbins = tG->GetEntries();
655 gRandom->RndmArray(6,rand);
656 Int_t ibin = TMath::BinarySearch(nbins,fInt,rand[0]);
658 y1 = fgy[cell[1]] + (fgy[cell[1]+1]-fgy[cell[1]])*rand[1];
659 y2 = fgy[cell[2]] + (fgy[cell[2]+1]-fgy[cell[2]])*rand[2];
660 pt1 = fgpt[cell[3]] + (fgpt[cell[3]+1]-fgpt[cell[3]])*rand[3];
661 pt2 = fgpt[cell[4]] + (fgpt[cell[4]+1]-fgpt[cell[4]])*rand[4];
662 dphi = fgdph[cell[5]]+ (fgdph[cell[5]+1]-fgdph[cell[5]])*rand[5];
665 //____________________________________________________________________________________
666 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)
668 // Generate a hadron pair
669 void (*fIpParaFunc)(TH2F *, Int_t &, Int_t &);//Pointer to hadron pair composition function
670 fIpParaFunc = IpCharm;
671 Double_t mq = 1.2; // c & b quark masses (used in AliPythia)
673 fIpParaFunc = IpBeauty;
676 Double_t z11, z12, z21, z22, pz1, pz2, e1, e2, mh, ptemp, rand[2];
678 TH2F *h2h[12], *h2s[12], *hProbHH; // hard & soft fragmentation and HH-probability functions
679 for (Int_t ipt = 0; ipt<fgnptbins; ipt++) {
680 sprintf(tag,"h2h_pt%d",ipt);
681 h2h[ipt] = (TH2F*) fG->Get(tag);
682 sprintf(tag,"h2s_pt%d",ipt);
683 h2s[ipt] = (TH2F*) fG->Get(tag);
687 for (Int_t ipt = 0; ipt<fgnptbins; ipt++) {
688 if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt])
689 h2h[ipt]->GetRandom2(z11, z21);
690 if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt])
691 h2h[ipt]->GetRandom2(z12, z22);
695 if (TMath::Abs(y1) > TMath::Abs(y2)) {
696 for (Int_t ipt = 0; ipt<fgnptbins; ipt++) {
697 if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt])
698 h2h[ipt]->GetRandom2(z11, z21);
699 if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt])
700 h2s[ipt]->GetRandom2(z12, z22);
704 for (Int_t ipt = 0; ipt<fgnptbins; ipt++) {
705 if(pt1 >= fgptbmin[ipt] && pt1 < fgptbmax[ipt])
706 h2s[ipt]->GetRandom2(z11, z21);
707 if(pt2 >= fgptbmin[ipt] && pt2 < fgptbmax[ipt])
708 h2h[ipt]->GetRandom2(z12, z22);
712 gRandom->RndmArray(2,rand);
713 ptemp = TMath::Sqrt(pt1*pt1 + mq*mq);
714 pz1 = ptemp*TMath::SinH(y1);
715 e1 = ptemp*TMath::CosH(y1);
716 ptemp = TMath::Sqrt(pt2*pt2 + mq*mq);
717 pz2 = ptemp*TMath::SinH(y2);
718 e2 = ptemp*TMath::CosH(y2);
720 hProbHH = (TH2F*)fG->Get("hProbHH");
721 fIpParaFunc(hProbHH, id3, id4);
722 mh = TDatabasePDG::Instance()->GetParticle(id3)->Mass();
723 ptemp = z11*z21*(e1*e1-pz1*pz1) - mh*mh;
724 if (idq==5) pt3 = pt1; // an approximation at low pt, try better
725 else pt3 = rand[0]; // pt3=pt1 gives less D-hadrons at low pt
726 if (ptemp > 0) pt3 = TMath::Sqrt(ptemp);
727 if (pz1 > 0) pz3 = (z11*(e1 + pz1) - z21*(e1 - pz1)) / 2;
728 else pz3 = (z21*(e1 + pz1) - z11*(e1 - pz1)) / 2;
729 e1 = TMath::Sqrt(pz3*pz3 + pt3*pt3 + mh*mh);
731 mh = TDatabasePDG::Instance()->GetParticle(id4)->Mass();
732 ptemp = z12*z22*(e2*e2-pz2*pz2) - mh*mh;
733 if (idq==5) pt4 = pt2; // an approximation at low pt, try better
735 if (ptemp > 0) pt4 = TMath::Sqrt(ptemp);
736 if (pz2 > 0) pz4 = (z12*(e2 + pz2) - z22*(e2 - pz2)) / 2;
737 else pz4 = (z22*(e2 + pz2) - z12*(e2 - pz2)) / 2;
738 e2 = TMath::Sqrt(pz4*pz4 + pt4*pt4 + mh*mh);
740 // small corr. instead of using Frag. Func. depending on yQ (in addition to ptQ)
741 Float_t ycorr = 0.2, y3, y4;
742 gRandom->RndmArray(2,rand);
743 y3 = 0.5 * TMath::Log((e1 + pz3 + 1.e-13)/(e1 - pz3 + 1.e-13));
744 y4 = 0.5 * TMath::Log((e2 + pz4 + 1.e-13)/(e2 - pz4 + 1.e-13));
745 if(TMath::Abs(y3)<ycorr && TMath::Abs(y4)<ycorr && rand[0]>0.5) {
746 ptemp = TMath::Sqrt((e1-pz3)*(e1+pz3));
747 y3 = 4*(1 - 2*rand[1]);
748 pz3 = ptemp*TMath::SinH(y3);