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;
69 SetMDCY(Pycomp(111),1,0);
70 // select structure function
72 SetMSTP(51,strucfunc);
74 // Pythia initialisation for selected processes//
78 for (Int_t i=1; i<= 200; i++) {
81 // select charm production
119 case kPyCharmUnforced:
128 case kPyBeautyUnforced:
138 // Minimum Bias pp-Collisions
141 // select Pythia min. bias model
143 SetMSUB(92,1); // single diffraction AB-->XB
144 SetMSUB(93,1); // single diffraction AB-->AX
145 SetMSUB(94,1); // double diffraction
146 SetMSUB(95,1); // low pt production
151 SetMSTP(51,7); // CTEQ5L pdf
152 SetMSTP(81,1); // Multiple Interactions ON
153 SetMSTP(82,4); // Double Gaussian Model
155 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
156 SetPARP(89,1000.); // [GeV] Ref. energy
157 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
158 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
159 SetPARP(84,0.5); // Core radius
160 SetPARP(85,0.33); // Regulates gluon prod. mechanism
161 SetPARP(86,0.66); // Regulates gluon prod. mechanism
162 SetPARP(67,1); // Regulates Initial State Radiation
165 // Minimum Bias pp-Collisions
168 // select Pythia min. bias model
170 SetMSUB(95,1); // low pt production
176 SetMSTP(51,7); // CTEQ5L pdf
177 SetMSTP(81,1); // Multiple Interactions ON
178 SetMSTP(82,4); // Double Gaussian Model
180 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
181 SetPARP(89,1000.); // [GeV] Ref. energy
182 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
183 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
184 SetPARP(84,0.5); // Core radius
185 SetPARP(85,0.33); // Regulates gluon prod. mechanism
186 SetPARP(86,0.66); // Regulates gluon prod. mechanism
187 SetPARP(67,1); // Regulates Initial State Radiation
198 case kPyCharmPbPbMNR:
200 // Tuning of Pythia parameters aimed to get a resonable agreement
201 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
202 // c-cbar single inclusive and double differential distributions.
203 // This parameter settings are meant to work with Pb-Pb collisions
204 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
205 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
206 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
211 // No multiple interactions
216 // Initial/final parton shower on (Pythia default)
238 // Tuning of Pythia parameters aimed to get a resonable agreement
239 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
240 // c-cbar single inclusive and double differential distributions.
241 // This parameter settings are meant to work with p-Pb collisions
242 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
243 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
244 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
249 // No multiple interactions
254 // Initial/final parton shower on (Pythia default)
276 // Tuning of Pythia parameters aimed to get a resonable agreement
277 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
278 // c-cbar single inclusive and double differential distributions.
279 // This parameter settings are meant to work with pp collisions
280 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
281 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
282 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
287 // No multiple interactions
292 // Initial/final parton shower on (Pythia default)
312 case kPyBeautyPbPbMNR:
313 // Tuning of Pythia parameters aimed to get a resonable agreement
314 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
315 // b-bbar single inclusive and double differential distributions.
316 // This parameter settings are meant to work with Pb-Pb collisions
317 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
318 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
319 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
324 // No multiple interactions
329 // Initial/final parton shower on (Pythia default)
351 case kPyBeautypPbMNR:
352 // Tuning of Pythia parameters aimed to get a resonable agreement
353 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
354 // b-bbar single inclusive and double differential distributions.
355 // This parameter settings are meant to work with p-Pb collisions
356 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
357 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
358 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
363 // No multiple interactions
368 // Initial/final parton shower on (Pythia default)
391 // Tuning of Pythia parameters aimed to get a resonable agreement
392 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
393 // b-bbar single inclusive and double differential distributions.
394 // This parameter settings are meant to work with pp collisions
395 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
396 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
397 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
402 // No multiple interactions
407 // Initial/final parton shower on (Pythia default)
432 SetMSTP(41,1); // all resonance decays switched on
434 Initialize("CMS","p","p",fEcms);
438 Int_t AliPythia::CheckedLuComp(Int_t kf)
440 // Check Lund particle code (for debugging)
442 printf("\n Lucomp kf,kc %d %d",kf,kc);
446 void AliPythia::SetNuclei(Int_t a1, Int_t a2)
448 // Treat protons as inside nuclei with mass numbers a1 and a2
449 // The MSTP array in the PYPARS common block is used to enable and
450 // select the nuclear structure functions.
451 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
452 // =1: internal PYTHIA acording to MSTP(51)
453 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
454 // If the following mass number both not equal zero, nuclear corrections of the stf are used.
455 // MSTP(192) : Mass number of nucleus side 1
456 // MSTP(193) : Mass number of nucleus side 2
463 AliPythia* AliPythia::Instance()
465 // Set random number generator
469 fgAliPythia = new AliPythia();
474 void AliPythia::PrintParticles()
476 // Print list of particl properties
478 char* name = new char[16];
479 for (Int_t kf=0; kf<1000000; kf++) {
480 for (Int_t c = 1; c > -2; c-=2) {
481 Int_t kc = Pycomp(c*kf);
483 Float_t mass = GetPMAS(kc,1);
484 Float_t width = GetPMAS(kc,2);
485 Float_t tau = GetPMAS(kc,4);
491 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
492 c*kf, name, mass, width, tau);
496 printf("\n Number of particles %d \n \n", np);
499 void AliPythia::ResetDecayTable()
501 // Set default values for pythia decay switches
503 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
504 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
507 void AliPythia::SetDecayTable()
509 // Set default values for pythia decay switches
512 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
513 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
516 void AliPythia::Pyclus(Int_t& njet)
518 // Call Pythia clustering algorithm
523 void AliPythia::Pycell(Int_t& njet)
525 // Call Pythia jet reconstruction algorithm
530 void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
532 // Call Pythia jet reconstruction algorithm
534 Int_t numpart = fPyjets->N;
535 for (Int_t i = 0; i < numpart; i++)
537 if (fPyjets->K[2][i] == 7) ip1 = i+1;
538 if (fPyjets->K[2][i] == 8) ip2 = i+1;
542 qmax = 2. * GetVINT(51);
543 printf("Pyshow %d %d %f", ip1, ip2, qmax);
545 pyshow(ip1, ip2, qmax);
548 void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
550 pyrobo(imi, ima, the, phi, bex, bey, bez);
555 void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t qTransport, Float_t maxLength, Int_t iECMethod)
558 // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
559 // (2) The nuclear geometry using the Glauber Model
563 fGlauber = new AliFastGlauber();
565 fGlauber->SetCentralityClass(cMin, cMax);
567 fQuenchingWeights = new AliQuenchingWeights();
568 fQuenchingWeights->InitMult();
569 fQuenchingWeights->SetQTransport(qTransport);
570 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
571 fQuenchingWeights->SetLengthMax(Int_t(maxLength));
572 fQuenchingWeights->SampleEnergyLoss();
577 void AliPythia::Quench()
581 // Simple Jet Quenching routine:
582 // =============================
583 // The jet formed by all final state partons radiated by the parton created
584 // in the hard collisions is quenched by a factor (1-z) using light cone variables in
585 // the initial parton reference frame:
586 // (E + p_z)new = (1-z) (E + p_z)old
591 // The lost momentum is first balanced by one gluon with virtuality > 0.
592 // Subsequently the gluon splits to yield two gluons with E = p.
596 const Int_t kGluons = 1;
601 Int_t klast[2] = {-1, -1};
604 Int_t numpart = fPyjets->N;
605 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0.;
606 Double_t pxq[2], pyq[2], pzq[2], eq[2], yq[2], mq[2], pq[2], phiq[2], thetaq[2], ptq[2];
609 Double_t zInitial[2], wjtKick[2];
615 for (Int_t i = 6; i <= 7; i++) {
618 pxq[j] = fPyjets->P[0][i];
619 pyq[j] = fPyjets->P[1][i];
620 pzq[j] = fPyjets->P[2][i];
621 eq[j] = fPyjets->P[3][i];
622 mq[j] = fPyjets->P[4][i];
623 yq[j] = 0.5 * TMath::Log((e + pz + 1.e-14) / (e - pz + 1.e-14));
624 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
625 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
626 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
627 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
630 // Quench only central jets
631 if (TMath::Abs(yq[j]) > 2.5) {
634 pdg = fPyjets->K[1][i];
636 // Get length in nucleus
638 fGlauber->GetLengthsForPythia(1, &phi, &l, -1.);
640 // Energy loss for given length and parton typr
641 Int_t itype = (pdg == 21) ? 2 : 1;
642 Double_t eloss = fQuenchingWeights->GetELossRandom(itype, l, eq[j]);
645 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->GetQTransport());
647 // Fractional energy loss
648 zInitial[j] = eloss / eq[j];
650 // Avoid complete loss
652 if (zInitial[j] == 1.) zInitial[j] = 0.95;
654 // Some debug printing
655 printf("Initial parton # %3d, Type %3d Energy %10.3f Phi %10.3f Length %10.3f Loss %10.3f Kick %10.3f\n",
656 j, itype, eq[j], phi, l, eloss, wjtKick[j]);
658 quenched[j] = (zInitial[j] > 0.01);
664 zInitial[0] = 1. - TMath::Power(1. - zInitial[0], 1./Double_t(kGluons));
665 zInitial[1] = 1. - TMath::Power(1. - zInitial[1], 1./Double_t(kGluons));
666 wjtKick[0] = wjtKick[0] / TMath::Sqrt(Double_t(kGluons));
667 wjtKick[1] = wjtKick[1] / TMath::Sqrt(Double_t(kGluons));
670 // Arrays to store particle 4-momenta to be changed
673 Double_t** pNew = new Double_t* [numpart];
674 for (Int_t i = 0; i < numpart; i++) pNew[i] = new Double_t [4];
675 Int_t* kNew = new Int_t [numpart];
678 Double_t pNew[1000][4];
683 for (Int_t iglu = 0; iglu < kGluons; iglu++) {
684 for (Int_t isys = 0; isys < 2; isys++) {
685 // Skip to next system if not quenched.
688 Double_t zHeavy = zInitial[isys];
690 if (!quenched[isys]) continue;
694 for (Int_t k = 0; k < 4; k++)
701 for (Int_t i = 0; i < numpart; i++)
703 imo = fPyjets->K[2][i];
704 kst = fPyjets->K[0][i];
705 pdg = fPyjets->K[1][i];
709 // Quarks and gluons only
710 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
711 // Particles from hard scattering only
712 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
713 if (imo != isys + 7 && imo != 1000 + isys + 7) continue;
715 // Skip comment lines
716 if (kst != 1 && kst != 2) continue;
719 px = fPyjets->P[0][i];
720 py = fPyjets->P[1][i];
721 pz = fPyjets->P[2][i];
722 e = fPyjets->P[3][i];
723 m = fPyjets->P[4][i];
724 pt = TMath::Sqrt(px * px + py * py);
725 p = TMath::Sqrt(px * px + py * py + pz * pz);
726 phi = TMath::Pi() + TMath::ATan2(-py, -px);
727 theta = TMath::ATan2(pt, pz);
730 // Save 4-momentum sum for balancing
731 Int_t index = imo - 7;
732 if (index >= 1000) index -= 1000;
739 // Don't quench radiated gluons
741 if (imo == 1000 + isys + 7) {
754 // Fractional energy loss
755 Double_t z = zInitial[index];
756 if (m > 0.) z = zHeavy;
760 // Transform into frame in which initial parton is along z-axis
762 TVector3 v(px, py, pz);
763 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
764 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
766 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
767 Double_t mt2 = jt * jt + m * m;
770 // Kinematic limit on z
774 zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
776 printf("We have to put z to the kinematic limit %e %e \n", z, zmax);
782 // If z is too small, there is no phase space for quenching
784 printf("No phase space for quenching ! %e \n", z);
791 } // massive particles
794 // Change light-cone kinematics rel. to initial parton
796 Double_t eppzOld = e + pl;
797 Double_t empzOld = e - pl;
799 Double_t eppzNew = (1. - z) * eppzOld;
800 Double_t empzNew = empzOld - mt2 * z / eppzOld;
801 Double_t eNew = 0.5 * (eppzNew + empzNew);
802 Double_t plNew = 0.5 * (eppzNew - empzNew);
806 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
807 Double_t mt2New = eppzNew * empzNew;
808 if (mt2New < 1.e-8) mt2New = 0.;
810 if (m * m > mt2New) {
812 // This should not happen
814 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
817 jtNew = TMath::Sqrt(mt2New - m * m);
822 // Calculate new px, py
824 Double_t pxNew = jtNew / jt * pxs;
825 Double_t pyNew = jtNew / jt * pys;
827 // Double_t dpx = pxs - pxNew;
828 // Double_t dpy = pys - pyNew;
829 // Double_t dpz = pl - plNew;
830 // Double_t de = e - eNew;
831 // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
832 // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
833 // printf("New mass (2) %e %e \n", pxNew, pyNew);
837 TVector3 w(pxNew, pyNew, plNew);
838 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
839 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
841 p1[index][0] += pxNew;
842 p1[index][1] += pyNew;
843 p1[index][2] += plNew;
844 p1[index][3] += eNew;
846 // Updated 4-momentum vectors
848 pNew[icount][0] = pxNew;
849 pNew[icount][1] = pyNew;
850 pNew[icount][2] = plNew;
851 pNew[icount][3] = eNew;
856 // Check if there was phase-space for quenching
859 if (icount == 0) quenched[isys] = kFALSE;
860 if (!quenched[isys]) break;
862 for (Int_t j = 0; j < 4; j++)
864 p2[isys][j] = p0[isys][j] - p1[isys][j];
866 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];
868 if (p2[isys][4] > 0.) {
869 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
872 printf("Warning negative mass squared in system %d %f ! \n", isys, zInitial[isys]);
874 printf("Kinematics %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]);
875 if (p2[isys][4] < -0.01) {
876 printf("Negative mass squared ! Let's try to fix this by decreasing z\n");
888 TVector3 v(p2[k][0], p2[k][1], p2[k][2]);
890 v.RotateY(-thetaq[k]);
891 Double_t px = v.X(); Double_t py = v.Y(); Double_t pz = v.Z();
892 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
893 Double_t jtKick = wjtKick[k] * TMath::Sqrt(-TMath::Log(r));
894 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
895 px += jtKick * TMath::Cos(phiKick);
896 py += jtKick * TMath::Sin(phiKick);
897 TVector3 w(px, py, pz);
898 w.RotateY(thetaq[k]);
900 p2[k][0] = w.X(); p2[k][1] = w.Y(); p2[k][2] = w.Z();
901 p2[k][3] = TMath::Sqrt(p2[k][0] * p2[k][0] + p2[k][1] * p2[k][1] + p2[k][2] * p2[k][2] + p2[k][4] * p2[k][4]);
904 printf("zHeavy lowered to %f\n", zHeavy);
906 printf("No success ! \n");
908 quenched[isys] = kFALSE;
913 // Update event record
914 for (Int_t k = 0; k < icount; k++) {
915 // 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] );
916 fPyjets->P[0][kNew[k]] = pNew[k][0];
917 fPyjets->P[1][kNew[k]] = pNew[k][1];
918 fPyjets->P[2][kNew[k]] = pNew[k][2];
919 fPyjets->P[3][kNew[k]] = pNew[k][3];
926 for (Int_t i = 0; i < 2; i++) {
927 Int_t jmin, jmax, iGlu, iNew;
928 if (!quenched[i]) continue;
930 // Last parton from shower i
933 // Continue if no parton in shower i selected
934 if (in == -1) continue;
936 // If this is the second initial parton and it is behind the first move pointer by previous ish
937 if (i == 1 && klast[1] > klast[0]) in += ish;
942 // How many additional gluons will be generated
944 if (p2[i][4] > 0.05) ish = 2;
946 // Position of gluons
949 jmax = numpart + ish - 1;
951 if (fPyjets->K[0][in-1] == 1 || fPyjets->K[0][in-1] == 21 || fPyjets->K[0][in-1] == 11) {
961 for (Int_t j = jmax; j > jmin; j--)
963 for (Int_t k = 0; k < 5; k++) {
964 fPyjets->K[k][j] = fPyjets->K[k][j-ish];
965 fPyjets->P[k][j] = fPyjets->P[k][j-ish];
966 fPyjets->V[k][j] = fPyjets->V[k][j-ish];
974 fPyjets->P[0][iGlu] = p2[i][0];
975 fPyjets->P[1][iGlu] = p2[i][1];
976 fPyjets->P[2][iGlu] = p2[i][2];
977 fPyjets->P[3][iGlu] = p2[i][3];
978 fPyjets->P[4][iGlu] = p2[i][4];
980 fPyjets->K[0][iGlu] = 2;
981 fPyjets->K[1][iGlu] = 21;
982 fPyjets->K[2][iGlu] = fPyjets->K[2][iNew] + 1000;
983 fPyjets->K[3][iGlu] = -1;
984 fPyjets->K[4][iGlu] = -1;
987 // Split gluon in rest frame.
989 Double_t bx = p2[i][0] / p2[i][3];
990 Double_t by = p2[i][1] / p2[i][3];
991 Double_t bz = p2[i][2] / p2[i][3];
992 Double_t pst = p2[i][4] / 2.;
994 // Isotropic decay ????
995 Double_t cost = 2. * gRandom->Rndm() - 1.;
996 Double_t sint = TMath::Sqrt(1. - cost * cost);
997 Double_t phi = 2. * TMath::Pi() * gRandom->Rndm();
999 Double_t pz1 = pst * cost;
1000 Double_t pz2 = -pst * cost;
1001 Double_t pt1 = pst * sint;
1002 Double_t pt2 = -pst * sint;
1003 Double_t px1 = pt1 * TMath::Cos(phi);
1004 Double_t py1 = pt1 * TMath::Sin(phi);
1005 Double_t px2 = pt2 * TMath::Cos(phi);
1006 Double_t py2 = pt2 * TMath::Sin(phi);
1008 fPyjets->P[0][iGlu] = px1;
1009 fPyjets->P[1][iGlu] = py1;
1010 fPyjets->P[2][iGlu] = pz1;
1011 fPyjets->P[3][iGlu] = pst;
1012 fPyjets->P[4][iGlu] = 0.;
1014 fPyjets->K[0][iGlu] = 2;
1015 fPyjets->K[1][iGlu] = 21;
1016 fPyjets->K[2][iGlu] = fPyjets->K[2][iNew] + 1000;
1017 fPyjets->K[3][iGlu] = -1;
1018 fPyjets->K[4][iGlu] = -1;
1020 fPyjets->P[0][iGlu+1] = px2;
1021 fPyjets->P[1][iGlu+1] = py2;
1022 fPyjets->P[2][iGlu+1] = pz2;
1023 fPyjets->P[3][iGlu+1] = pst;
1024 fPyjets->P[4][iGlu+1] = 0.;
1026 fPyjets->K[0][iGlu+1] = 2;
1027 fPyjets->K[1][iGlu+1] = 21;
1028 fPyjets->K[2][iGlu+1] = fPyjets->K[2][iNew] + 1000;
1029 fPyjets->K[3][iGlu+1] = -1;
1030 fPyjets->K[4][iGlu+1] = -1;
1036 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1040 // Check energy conservation
1044 Double_t es = 14000.;
1046 for (Int_t i = 0; i < numpart; i++)
1048 kst = fPyjets->K[0][i];
1049 if (kst != 1 && kst != 2) continue;
1050 pxs += fPyjets->P[0][i];
1051 pys += fPyjets->P[1][i];
1052 pzs += fPyjets->P[2][i];
1053 es -= fPyjets->P[3][i];
1055 if (TMath::Abs(pxs) > 1.e-2 ||
1056 TMath::Abs(pys) > 1.e-2 ||
1057 TMath::Abs(pzs) > 1.e-1) {
1058 printf("%e %e %e %e\n", pxs, pys, pzs, es);
1060 Fatal("Quench()", "4-Momentum non-conservation");
1064 } // end quenching loop
1066 for (Int_t i = 0; i < numpart; i++)
1068 imo = fPyjets->K[2][i];
1069 if (imo > 1000) fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;