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 *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
18 #include "AliPythia.h"
19 #include "AliPythiaRndm.h"
20 #include "../FASTSIM/AliFastGlauber.h"
21 #include "../FASTSIM/AliQuenchingWeights.h"
27 # define pyclus pyclus_
28 # define pycell pycell_
29 # define pyshow pyshow_
30 # define pyrobo pyrobo_
33 # define pyclus PYCLUS
34 # define pycell PYCELL
35 # define pyrobo PYROBO
36 # define type_of_call _stdcall
39 extern "C" void type_of_call pyclus(Int_t & );
40 extern "C" void type_of_call pycell(Int_t & );
41 extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
42 extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
44 //_____________________________________________________________________________
46 AliPythia* AliPythia::fgAliPythia=NULL;
48 AliPythia::AliPythia()
50 // Default Constructor
53 if (!AliPythiaRndm::GetPythiaRandom())
54 AliPythiaRndm::SetPythiaRandom(GetRandom());
56 fQuenchingWeights = 0;
59 void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
61 // Initialise the process to generate
62 if (!AliPythiaRndm::GetPythiaRandom())
63 AliPythiaRndm::SetPythiaRandom(GetRandom());
67 fStrucFunc = strucfunc;
68 //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
69 SetMDCY(Pycomp(111) ,1,0);
70 SetMDCY(Pycomp(310) ,1,0);
71 SetMDCY(Pycomp(3122),1,0);
72 SetMDCY(Pycomp(3112),1,0);
73 SetMDCY(Pycomp(3212),1,0);
74 SetMDCY(Pycomp(3222),1,0);
75 SetMDCY(Pycomp(3312),1,0);
76 SetMDCY(Pycomp(3322),1,0);
77 SetMDCY(Pycomp(3334),1,0);
78 // select structure function
80 SetMSTP(51,strucfunc);
82 // Pythia initialisation for selected processes//
86 for (Int_t i=1; i<= 200; i++) {
89 // select charm production
127 case kPyCharmUnforced:
136 case kPyBeautyUnforced:
146 // Minimum Bias pp-Collisions
149 // select Pythia min. bias model
151 SetMSUB(92,1); // single diffraction AB-->XB
152 SetMSUB(93,1); // single diffraction AB-->AX
153 SetMSUB(94,1); // double diffraction
154 SetMSUB(95,1); // low pt production
160 SetMSTP(51, kCTEQ5L); // CTEQ5L pdf
161 SetMSTP(81,1); // Multiple Interactions ON
162 SetMSTP(82,4); // Double Gaussian Model
164 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
165 SetPARP(89,1000.); // [GeV] Ref. energy
166 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
167 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
168 SetPARP(84,0.5); // Core radius
169 SetPARP(85,0.33); // Regulates gluon prod. mechanism
170 SetPARP(86,0.66); // Regulates gluon prod. mechanism
171 SetPARP(67,1); // Regulates Initial State Radiation
174 // Minimum Bias pp-Collisions
177 // select Pythia min. bias model
179 SetMSUB(95,1); // low pt production
185 SetMSTP(51,kCTEQ5L); // CTEQ5L pdf
186 SetMSTP(81,1); // Multiple Interactions ON
187 SetMSTP(82,4); // Double Gaussian Model
189 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
190 SetPARP(89,1000.); // [GeV] Ref. energy
191 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
192 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
193 SetPARP(84,0.5); // Core radius
194 SetPARP(85,0.33); // Regulates gluon prod. mechanism
195 SetPARP(86,0.66); // Regulates gluon prod. mechanism
196 SetPARP(67,1); // Regulates Initial State Radiation
207 case kPyCharmPbPbMNR:
209 // Tuning of Pythia parameters aimed to get a resonable agreement
210 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
211 // c-cbar single inclusive and double differential distributions.
212 // This parameter settings are meant to work with Pb-Pb collisions
213 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
214 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
215 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
220 // No multiple interactions
225 // Initial/final parton shower on (Pythia default)
245 case kPyDPlusPbPbMNR:
246 // Tuning of Pythia parameters aimed to get a resonable agreement
247 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
248 // c-cbar single inclusive and double differential distributions.
249 // This parameter settings are meant to work with Pb-Pb collisions
250 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
251 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
252 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
257 // No multiple interactions
262 // Initial/final parton shower on (Pythia default)
284 // Tuning of Pythia parameters aimed to get a resonable agreement
285 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
286 // c-cbar single inclusive and double differential distributions.
287 // This parameter settings are meant to work with p-Pb collisions
288 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
289 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
290 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
295 // No multiple interactions
300 // Initial/final parton shower on (Pythia default)
321 // Tuning of Pythia parameters aimed to get a resonable agreement
322 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
323 // c-cbar single inclusive and double differential distributions.
324 // This parameter settings are meant to work with p-Pb collisions
325 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
326 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
327 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
332 // No multiple interactions
337 // Initial/final parton shower on (Pythia default)
359 // Tuning of Pythia parameters aimed to get a resonable agreement
360 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
361 // c-cbar single inclusive and double differential distributions.
362 // This parameter settings are meant to work with pp collisions
363 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
364 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
365 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
370 // No multiple interactions
375 // Initial/final parton shower on (Pythia default)
396 // Tuning of Pythia parameters aimed to get a resonable agreement
397 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
398 // c-cbar single inclusive and double differential distributions.
399 // This parameter settings are meant to work with pp collisions
400 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
401 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
402 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
407 // No multiple interactions
412 // Initial/final parton shower on (Pythia default)
432 case kPyBeautyPbPbMNR:
433 // Tuning of Pythia parameters aimed to get a resonable agreement
434 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
435 // b-bbar single inclusive and double differential distributions.
436 // This parameter settings are meant to work with Pb-Pb collisions
437 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
438 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
439 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
444 // No multiple interactions
449 // Initial/final parton shower on (Pythia default)
471 case kPyBeautypPbMNR:
472 // Tuning of Pythia parameters aimed to get a resonable agreement
473 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
474 // b-bbar single inclusive and double differential distributions.
475 // This parameter settings are meant to work with p-Pb collisions
476 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
477 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
478 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
483 // No multiple interactions
488 // Initial/final parton shower on (Pythia default)
511 // Tuning of Pythia parameters aimed to get a resonable agreement
512 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
513 // b-bbar single inclusive and double differential distributions.
514 // This parameter settings are meant to work with pp collisions
515 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
516 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
517 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
522 // No multiple interactions
527 // Initial/final parton shower on (Pythia default)
552 SetMSTP(41,1); // all resonance decays switched on
554 Initialize("CMS","p","p",fEcms);
558 Int_t AliPythia::CheckedLuComp(Int_t kf)
560 // Check Lund particle code (for debugging)
562 printf("\n Lucomp kf,kc %d %d",kf,kc);
566 void AliPythia::SetNuclei(Int_t a1, Int_t a2)
568 // Treat protons as inside nuclei with mass numbers a1 and a2
569 // The MSTP array in the PYPARS common block is used to enable and
570 // select the nuclear structure functions.
571 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
572 // =1: internal PYTHIA acording to MSTP(51)
573 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
574 // If the following mass number both not equal zero, nuclear corrections of the stf are used.
575 // MSTP(192) : Mass number of nucleus side 1
576 // MSTP(193) : Mass number of nucleus side 2
583 AliPythia* AliPythia::Instance()
585 // Set random number generator
589 fgAliPythia = new AliPythia();
594 void AliPythia::PrintParticles()
596 // Print list of particl properties
598 char* name = new char[16];
599 for (Int_t kf=0; kf<1000000; kf++) {
600 for (Int_t c = 1; c > -2; c-=2) {
601 Int_t kc = Pycomp(c*kf);
603 Float_t mass = GetPMAS(kc,1);
604 Float_t width = GetPMAS(kc,2);
605 Float_t tau = GetPMAS(kc,4);
611 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
612 c*kf, name, mass, width, tau);
616 printf("\n Number of particles %d \n \n", np);
619 void AliPythia::ResetDecayTable()
621 // Set default values for pythia decay switches
623 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
624 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
627 void AliPythia::SetDecayTable()
629 // Set default values for pythia decay switches
632 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
633 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
636 void AliPythia::Pyclus(Int_t& njet)
638 // Call Pythia clustering algorithm
643 void AliPythia::Pycell(Int_t& njet)
645 // Call Pythia jet reconstruction algorithm
650 void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
652 // Call Pythia jet reconstruction algorithm
654 pyshow(ip1, ip2, qmax);
657 void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
659 pyrobo(imi, ima, the, phi, bex, bey, bez);
664 void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod)
667 // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
668 // (2) The nuclear geometry using the Glauber Model
672 fGlauber = new AliFastGlauber();
674 fGlauber->SetCentralityClass(cMin, cMax);
676 fQuenchingWeights = new AliQuenchingWeights();
677 fQuenchingWeights->InitMult();
678 fQuenchingWeights->SetK(k);
679 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
683 void AliPythia::Quench()
687 // Simple Jet Quenching routine:
688 // =============================
689 // The jet formed by all final state partons radiated by the parton created
690 // in the hard collisions is quenched by a factor (1-z) using light cone variables in
691 // the initial parton reference frame:
692 // (E + p_z)new = (1-z) (E + p_z)old
697 // The lost momentum is first balanced by one gluon with virtuality > 0.
698 // Subsequently the gluon splits to yield two gluons with E = p.
702 static Float_t eMean = 0.;
703 static Int_t icall = 0;
708 Int_t klast[4] = {-1, -1, -1, -1};
710 Int_t numpart = fPyjets->N;
711 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
712 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
714 Double_t zInitial[4], wjtKick[4];
719 // Sore information about Primary partons
722 // 0, 1 partons from hard scattering
723 // 2, 3 partons from initial state radiation
725 for (Int_t i = 2; i <= 7; i++) {
727 // Skip gluons that participate in hard scattering
728 if (i == 4 || i == 5) continue;
729 // Gluons from hard Scattering
730 if (i == 6 || i == 7) {
732 pxq[j] = fPyjets->P[0][i];
733 pyq[j] = fPyjets->P[1][i];
734 pzq[j] = fPyjets->P[2][i];
735 eq[j] = fPyjets->P[3][i];
736 mq[j] = fPyjets->P[4][i];
738 // Gluons from initial state radiation
740 // Obtain 4-momentum vector from difference between original parton and parton after gluon
741 // radiation. Energy is calculated independently because initial state radition does not
742 // conserve strictly momentum and energy for each partonic system independently.
744 // Not very clean. Should be improved !
748 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
749 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
750 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
751 mq[j] = fPyjets->P[4][i];
752 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
755 // Calculate some kinematic variables
757 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
758 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
759 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
760 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
761 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
762 qPdg[j] = fPyjets->K[1][i];
768 fGlauber->GetI0I1ForPythia(4, phiq, int0, int1, 15.);
770 for (Int_t j = 0; j < 4; j++) {
772 // Quench only central jets and with E > 10.
776 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
777 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
779 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
782 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
788 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
789 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
791 // Fractional energy loss
792 zInitial[j] = eloss / eq[j];
794 // Avoid complete loss
796 if (zInitial[j] == 1.) zInitial[j] = 0.95;
798 // Some debug printing
801 // printf("Initial parton # %3d, Type %3d Energy %10.3f Phi %10.3f Length %10.3f Loss %10.3f Kick %10.3f Mean: %10.3f %10.3f\n",
802 // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
804 // zInitial[j] = 0.8;
805 // while (zInitial[j] >= 0.95) zInitial[j] = gRandom->Exp(0.2);
808 quenched[j] = (zInitial[j] > 0.01);
811 Double_t pNew[1000][4];
816 for (Int_t isys = 0; isys < 4; isys++) {
817 // Skip to next system if not quenched.
818 if (!quenched[isys]) continue;
820 nGluon[isys] = 1 + Int_t(zInitial[isys] / (1. - zInitial[isys]));
821 if (nGluon[isys] > 6) nGluon[isys] = 6;
822 zInitial[isys] = 1. - TMath::Power(1. - zInitial[isys], 1./Double_t(nGluon[isys]));
823 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
829 Double_t pg[4] = {0., 0., 0., 0.};
832 // Loop on radiation events
834 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
837 for (Int_t k = 0; k < 4; k++)
844 for (Int_t i = 0; i < numpart; i++)
846 imo = fPyjets->K[2][i];
847 kst = fPyjets->K[0][i];
848 pdg = fPyjets->K[1][i];
852 // Quarks and gluons only
853 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
854 // Particles from hard scattering only
856 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
857 Int_t imom = imo % 1000;
858 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
859 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
862 // Skip comment lines
863 if (kst != 1 && kst != 2) continue;
866 px = fPyjets->P[0][i];
867 py = fPyjets->P[1][i];
868 pz = fPyjets->P[2][i];
869 e = fPyjets->P[3][i];
870 m = fPyjets->P[4][i];
871 pt = TMath::Sqrt(px * px + py * py);
872 p = TMath::Sqrt(px * px + py * py + pz * pz);
873 phi = TMath::Pi() + TMath::ATan2(-py, -px);
874 theta = TMath::ATan2(pt, pz);
877 // Save 4-momentum sum for balancing
888 // Fractional energy loss
889 Double_t z = zInitial[index];
892 // Don't fully quench radiated gluons
895 // This small factor makes sure that the gluons are not too close in phase space to avoid recombination
900 // printf("z: %d %f\n", imo, z);
907 // Transform into frame in which initial parton is along z-axis
909 TVector3 v(px, py, pz);
910 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
911 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
913 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
914 Double_t mt2 = jt * jt + m * m;
917 // Kinematic limit on z
919 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
921 // Change light-cone kinematics rel. to initial parton
923 Double_t eppzOld = e + pl;
924 Double_t empzOld = e - pl;
926 Double_t eppzNew = (1. - z) * eppzOld;
927 Double_t empzNew = empzOld - mt2 * z / eppzOld;
928 Double_t eNew = 0.5 * (eppzNew + empzNew);
929 Double_t plNew = 0.5 * (eppzNew - empzNew);
933 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
934 Double_t mt2New = eppzNew * empzNew;
935 if (mt2New < 1.e-8) mt2New = 0.;
937 if (m * m > mt2New) {
939 // This should not happen
941 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
944 jtNew = TMath::Sqrt(mt2New - m * m);
947 // If pT is to small (probably a leading massive particle) we scale only the energy
948 // This can cause negative masses of the radiated gluon
949 // Let's hope for the best ...
951 eNew = TMath::Sqrt(plNew * plNew + mt2);
955 // Calculate new px, py
957 Double_t pxNew = jtNew / jt * pxs;
958 Double_t pyNew = jtNew / jt * pys;
960 // Double_t dpx = pxs - pxNew;
961 // Double_t dpy = pys - pyNew;
962 // Double_t dpz = pl - plNew;
963 // Double_t de = e - eNew;
964 // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
965 // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
966 // printf("New mass (2) %e %e \n", pxNew, pyNew);
970 TVector3 w(pxNew, pyNew, plNew);
971 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
972 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
974 p1[index][0] += pxNew;
975 p1[index][1] += pyNew;
976 p1[index][2] += plNew;
977 p1[index][3] += eNew;
979 // Updated 4-momentum vectors
981 pNew[icount][0] = pxNew;
982 pNew[icount][1] = pyNew;
983 pNew[icount][2] = plNew;
984 pNew[icount][3] = eNew;
989 // Check if there was phase-space for quenching
992 if (icount == 0) quenched[isys] = kFALSE;
993 if (!quenched[isys]) break;
995 for (Int_t j = 0; j < 4; j++)
997 p2[isys][j] = p0[isys][j] - p1[isys][j];
999 p2[isys][4] = p2[isys][3] * p2[isys][3] - p2[isys][0] * p2[isys][0] - p2[isys][1] * p2[isys][1] - p2[isys][2] * p2[isys][2];
1000 if (p2[isys][4] > 0.) {
1001 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1004 printf("Warning negative mass squared in system %d %f ! \n", isys, zInitial[isys]);
1005 printf("4-Momentum: %10.3e %10.3e %10.3e %10.3e %10.3e \n", p2[isys][0], p2[isys][1], p2[isys][2], p2[isys][3], p2[isys][4]);
1006 if (p2[isys][4] < -0.01) {
1007 printf("Negative mass squared !\n");
1008 // Here we have to put the gluon back to mass shell
1009 // This will lead to a small energy imbalance
1011 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1020 printf("zHeavy lowered to %f\n", zHeavy);
1021 if (zHeavy < 0.01) {
1022 printf("No success ! \n");
1024 quenched[isys] = kFALSE;
1028 } // iteration on z (while)
1030 // Update event record
1031 for (Int_t k = 0; k < icount; k++) {
1032 // printf("%6d %6d %10.3e %10.3e %10.3e %10.3e\n", k, kNew[k], pNew[k][0],pNew[k][1], pNew[k][2], pNew[k][3] );
1033 fPyjets->P[0][kNew[k]] = pNew[k][0];
1034 fPyjets->P[1][kNew[k]] = pNew[k][1];
1035 fPyjets->P[2][kNew[k]] = pNew[k][2];
1036 fPyjets->P[3][kNew[k]] = pNew[k][3];
1043 if (!quenched[isys]) continue;
1045 // Last parton from shower i
1046 Int_t in = klast[isys];
1048 // Continue if no parton in shower i selected
1049 if (in == -1) continue;
1051 // If this is the second initial parton and it is behind the first move pointer by previous ish
1052 if (isys == 1 && klast[1] > klast[0]) in += ish;
1057 // How many additional gluons will be generated
1059 if (p2[isys][4] > 0.05) ish = 2;
1061 // Position of gluons
1063 if (iglu == 0) igMin = iGlu;
1066 (fPyjets->N) += ish;
1069 fPyjets->P[0][iGlu] = p2[isys][0];
1070 fPyjets->P[1][iGlu] = p2[isys][1];
1071 fPyjets->P[2][iGlu] = p2[isys][2];
1072 fPyjets->P[3][iGlu] = p2[isys][3];
1073 fPyjets->P[4][iGlu] = p2[isys][4];
1075 fPyjets->K[0][iGlu] = 1;
1076 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
1077 fPyjets->K[1][iGlu] = 21;
1078 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1079 fPyjets->K[3][iGlu] = -1;
1080 fPyjets->K[4][iGlu] = -1;
1082 pg[0] += p2[isys][0];
1083 pg[1] += p2[isys][1];
1084 pg[2] += p2[isys][2];
1085 pg[3] += p2[isys][3];
1088 // Split gluon in rest frame.
1090 Double_t bx = p2[isys][0] / p2[isys][3];
1091 Double_t by = p2[isys][1] / p2[isys][3];
1092 Double_t bz = p2[isys][2] / p2[isys][3];
1093 Double_t pst = p2[isys][4] / 2.;
1095 // Isotropic decay ????
1096 Double_t cost = 2. * gRandom->Rndm() - 1.;
1097 Double_t sint = TMath::Sqrt(1. - cost * cost);
1098 Double_t phi = 2. * TMath::Pi() * gRandom->Rndm();
1100 Double_t pz1 = pst * cost;
1101 Double_t pz2 = -pst * cost;
1102 Double_t pt1 = pst * sint;
1103 Double_t pt2 = -pst * sint;
1104 Double_t px1 = pt1 * TMath::Cos(phi);
1105 Double_t py1 = pt1 * TMath::Sin(phi);
1106 Double_t px2 = pt2 * TMath::Cos(phi);
1107 Double_t py2 = pt2 * TMath::Sin(phi);
1109 fPyjets->P[0][iGlu] = px1;
1110 fPyjets->P[1][iGlu] = py1;
1111 fPyjets->P[2][iGlu] = pz1;
1112 fPyjets->P[3][iGlu] = pst;
1113 fPyjets->P[4][iGlu] = 0.;
1115 fPyjets->K[0][iGlu] = 1 ;
1116 fPyjets->K[1][iGlu] = 21;
1117 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1118 fPyjets->K[3][iGlu] = -1;
1119 fPyjets->K[4][iGlu] = -1;
1121 fPyjets->P[0][iGlu+1] = px2;
1122 fPyjets->P[1][iGlu+1] = py2;
1123 fPyjets->P[2][iGlu+1] = pz2;
1124 fPyjets->P[3][iGlu+1] = pst;
1125 fPyjets->P[4][iGlu+1] = 0.;
1127 fPyjets->K[0][iGlu+1] = 1;
1128 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
1129 fPyjets->K[1][iGlu+1] = 21;
1130 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
1131 fPyjets->K[3][iGlu+1] = -1;
1132 fPyjets->K[4][iGlu+1] = -1;
1138 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1141 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1142 Double_t px, py, pz;
1143 px = fPyjets->P[0][ig];
1144 py = fPyjets->P[1][ig];
1145 pz = fPyjets->P[2][ig];
1146 TVector3 v(px, py, pz);
1147 v.RotateZ(-phiq[isys]);
1148 v.RotateY(-thetaq[isys]);
1149 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1150 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1151 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1152 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1153 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1154 pxs += jtKick * TMath::Cos(phiKick);
1155 pys += jtKick * TMath::Sin(phiKick);
1156 TVector3 w(pxs, pys, pzs);
1157 w.RotateY(thetaq[isys]);
1158 w.RotateZ(phiq[isys]);
1159 fPyjets->P[0][ig] = w.X();
1160 fPyjets->P[1][ig] = w.Y();
1161 fPyjets->P[2][ig] = w.Z();
1162 fPyjets->P[2][ig] = w.Mag();
1168 // Check energy conservation
1172 Double_t es = 14000.;
1174 for (Int_t i = 0; i < numpart; i++)
1176 kst = fPyjets->K[0][i];
1177 if (kst != 1 && kst != 2) continue;
1178 pxs += fPyjets->P[0][i];
1179 pys += fPyjets->P[1][i];
1180 pzs += fPyjets->P[2][i];
1181 es -= fPyjets->P[3][i];
1183 if (TMath::Abs(pxs) > 1.e-2 ||
1184 TMath::Abs(pys) > 1.e-2 ||
1185 TMath::Abs(pzs) > 1.e-1) {
1186 printf("%e %e %e %e\n", pxs, pys, pzs, es);
1187 // Fatal("Quench()", "4-Momentum non-conservation");
1190 } // end quenching loop (systems)
1192 for (Int_t i = 0; i < numpart; i++)
1194 imo = fPyjets->K[2][i];
1196 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;