2 /**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
19 #include "AliPythia.h"
20 #include "AliPythiaRndm.h"
21 #include "AliFastGlauber.h"
22 #include "AliQuenchingWeights.h"
24 #include "PyquenCommon.h"
29 # define pyclus pyclus_
30 # define pycell pycell_
31 # define pyshow pyshow_
32 # define pyrobo pyrobo_
33 # define pyquen pyquen_
34 # define pyevnw pyevnw_
35 # define pyshowq pyshowq_
36 # define pytune pytune_
37 # define py2ent py2ent_
40 # define pyclus PYCLUS
41 # define pycell PYCELL
42 # define pyrobo PYROBO
43 # define pyquen PYQUEN
44 # define pyevnw PYEVNW
45 # define pyshowq PYSHOWQ
46 # define pytune PYTUNE
47 # define py2ent PY2ENT
48 # define type_of_call _stdcall
51 extern "C" void type_of_call pyclus(Int_t & );
52 extern "C" void type_of_call pycell(Int_t & );
53 extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
54 extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
55 extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
56 extern "C" void type_of_call pyevnw(){;}
57 extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
58 extern "C" void type_of_call pytune(Int_t &);
59 extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
61 //_____________________________________________________________________________
63 AliPythia* AliPythia::fgAliPythia=NULL;
65 AliPythia::AliPythia():
77 // Default Constructor
80 if (!AliPythiaRndm::GetPythiaRandom())
81 AliPythiaRndm::SetPythiaRandom(GetRandom());
83 fQuenchingWeights = 0;
86 AliPythia::AliPythia(const AliPythia& pythia):
104 void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
106 // Initialise the process to generate
107 if (!AliPythiaRndm::GetPythiaRandom())
108 AliPythiaRndm::SetPythiaRandom(GetRandom());
114 fStrucFunc = strucfunc;
115 //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
116 SetMDCY(Pycomp(111) ,1,0); // pi0
117 SetMDCY(Pycomp(310) ,1,0); // K0S
118 SetMDCY(Pycomp(3122),1,0); // kLambda
119 SetMDCY(Pycomp(3112),1,0); // sigma -
120 SetMDCY(Pycomp(3212),1,0); // sigma 0
121 SetMDCY(Pycomp(3222),1,0); // sigma +
122 SetMDCY(Pycomp(3312),1,0); // xi -
123 SetMDCY(Pycomp(3322),1,0); // xi 0
124 SetMDCY(Pycomp(3334),1,0); // omega-
125 // Select structure function
127 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
128 // Particles produced in string fragmentation point directly to either of the two endpoints
129 // of the string (depending in the side they were generated from).
133 // Pythia initialisation for selected processes//
137 for (Int_t i=1; i<= 200; i++) {
140 // select charm production
143 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
144 // Multiple interactions on.
146 // Double Gaussian matter distribution.
152 // Reference energy for pT0 and energy rescaling pace.
155 // String drawing almost completely minimizes string length.
158 // ISR and FSR activity.
164 case kPyOldUEQ2ordered2:
165 // Old underlying events with Q2 ordered QCD processes
166 // Multiple interactions on.
168 // Double Gaussian matter distribution.
174 // Reference energy for pT0 and energy rescaling pace.
176 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
177 // String drawing almost completely minimizes string length.
180 // ISR and FSR activity.
187 // Old production mechanism: Old Popcorn
190 // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
192 // (D=1)see can be used to form baryons (BARYON JUNCTION)
198 // heavy quark masses
228 case kPyCharmUnforced:
237 case kPyBeautyUnforced:
247 // Minimum Bias pp-Collisions
250 // select Pythia min. bias model
252 SetMSUB(92,1); // single diffraction AB-->XB
253 SetMSUB(93,1); // single diffraction AB-->AX
254 SetMSUB(94,1); // double diffraction
255 SetMSUB(95,1); // low pt production
260 case kPyMbAtlasTuneMC09:
261 // Minimum Bias pp-Collisions
264 // select Pythia min. bias model
266 SetMSUB(92,1); // single diffraction AB-->XB
267 SetMSUB(93,1); // single diffraction AB-->AX
268 SetMSUB(94,1); // double diffraction
269 SetMSUB(95,1); // low pt production
274 case kPyMbWithDirectPhoton:
275 // Minimum Bias pp-Collisions with direct photon processes added
278 // select Pythia min. bias model
280 SetMSUB(92,1); // single diffraction AB-->XB
281 SetMSUB(93,1); // single diffraction AB-->AX
282 SetMSUB(94,1); // double diffraction
283 SetMSUB(95,1); // low pt production
296 // Minimum Bias pp-Collisions
299 // select Pythia min. bias model
301 SetMSUB(92,0); // single diffraction AB-->XB
302 SetMSUB(93,0); // single diffraction AB-->AX
303 SetMSUB(94,1); // double diffraction
304 SetMSUB(95,1); // low pt production
306 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
307 SetMSTP(82,4); // Double Gaussian Model
308 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
309 SetPARP(84,0.4); // Core radius
310 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
311 SetPARP(86,0.95); // Regulates gluon prod. mechanism
312 SetPARP(89,1800.); // [GeV] Ref. energy
313 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
317 // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
318 // -> Pythia 6.3 or above is needed
321 SetMSUB(92,1); // single diffraction AB-->XB
322 SetMSUB(93,1); // single diffraction AB-->AX
323 SetMSUB(94,1); // double diffraction
324 SetMSUB(95,1); // low pt production
326 SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
330 SetMSTP(81,1); // Multiple Interactions ON
331 SetMSTP(82,4); // Double Gaussian Model
334 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
335 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
336 SetPARP(84,0.5); // Core radius
337 SetPARP(85,0.9); // Regulates gluon prod. mechanism
338 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
342 // Minimum Bias pp-Collisions
345 // select Pythia min. bias model
347 SetMSUB(95,1); // low pt production
354 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
355 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
356 SetPARP(93,5.); // Upper cut-off
358 SetPMAS(4,1,1.2); // Charm quark mass
359 SetPMAS(5,1,4.78); // Beauty quark mass
360 SetPARP(71,4.); // Defaut value
369 // Pythia Tune A (CDF)
371 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
372 SetMSTP(82,4); // Double Gaussian Model
373 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
374 SetPARP(84,0.4); // Core radius
375 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
376 SetPARP(86,0.95); // Regulates gluon prod. mechanism
377 SetPARP(89,1800.); // [GeV] Ref. energy
378 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
383 case kPyCharmPbPbMNR:
385 case kPyDPlusPbPbMNR:
386 case kPyDPlusStrangePbPbMNR:
387 // Tuning of Pythia parameters aimed to get a resonable agreement
388 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
389 // c-cbar single inclusive and double differential distributions.
390 // This parameter settings are meant to work with Pb-Pb collisions
391 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
392 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
393 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
405 case kPyDPlusStrangepPbMNR:
406 // Tuning of Pythia parameters aimed to get a resonable agreement
407 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
408 // c-cbar single inclusive and double differential distributions.
409 // This parameter settings are meant to work with p-Pb collisions
410 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
411 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
412 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
425 case kPyDPlusStrangeppMNR:
426 // Tuning of Pythia parameters aimed to get a resonable agreement
427 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
428 // c-cbar single inclusive and double differential distributions.
429 // This parameter settings are meant to work with pp collisions
430 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
431 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
432 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
442 case kPyCharmppMNRwmi:
443 // Tuning of Pythia parameters aimed to get a resonable agreement
444 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
445 // c-cbar single inclusive and double differential distributions.
446 // This parameter settings are meant to work with pp collisions
447 // and with kCTEQ5L PDFs.
448 // Added multiple interactions according to ATLAS tune settings.
449 // To get a "reasonable" agreement with MNR results, events have to be
450 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
452 // To get a "perfect" agreement with MNR results, events have to be
453 // generated in four ptHard bins with the following relative
469 case kPyBeautyPbPbMNR:
470 // Tuning of Pythia parameters aimed to get a resonable agreement
471 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
472 // b-bbar single inclusive and double differential distributions.
473 // This parameter settings are meant to work with Pb-Pb collisions
474 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
475 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
476 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
488 case kPyBeautypPbMNR:
489 // Tuning of Pythia parameters aimed to get a resonable agreement
490 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
491 // b-bbar single inclusive and double differential distributions.
492 // This parameter settings are meant to work with p-Pb collisions
493 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
494 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
495 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
508 // Tuning of Pythia parameters aimed to get a resonable agreement
509 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
510 // b-bbar single inclusive and double differential distributions.
511 // This parameter settings are meant to work with pp collisions
512 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
513 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
514 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
529 case kPyBeautyppMNRwmi:
530 // Tuning of Pythia parameters aimed to get a resonable agreement
531 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
532 // b-bbar single inclusive and double differential distributions.
533 // This parameter settings are meant to work with pp collisions
534 // and with kCTEQ5L PDFs.
535 // Added multiple interactions according to ATLAS tune settings.
536 // To get a "reasonable" agreement with MNR results, events have to be
537 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
539 // To get a "perfect" agreement with MNR results, events have to be
540 // generated in four ptHard bins with the following relative
563 //Inclusive production of W+/-
569 // //f fbar -> gamma W+
576 // Initial/final parton shower on (Pythia default)
577 // With parton showers on we are generating "W inclusive process"
578 SetMSTP(61,1); //Initial QCD & QED showers on
579 SetMSTP(71,1); //Final QCD & QED showers on
585 //Inclusive production of Z
590 // // f fbar -> g Z/gamma
592 // // f fbar -> gamma Z/gamma
594 // // f g -> f Z/gamma
596 // // f gamma -> f Z/gamma
599 //only Z included, not gamma
602 // Initial/final parton shower on (Pythia default)
603 // With parton showers on we are generating "Z inclusive process"
604 SetMSTP(61,1); //Initial QCD & QED showers on
605 SetMSTP(71,1); //Final QCD & QED showers on
614 if (itune > -1) Pytune(itune);
617 SetMSTP(41,1); // all resonance decays switched on
618 Initialize("CMS","p","pbar",fEcms);
622 Int_t AliPythia::CheckedLuComp(Int_t kf)
624 // Check Lund particle code (for debugging)
626 printf("\n Lucomp kf,kc %d %d",kf,kc);
630 void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
632 // Treat protons as inside nuclei with mass numbers a1 and a2
633 // The MSTP array in the PYPARS common block is used to enable and
634 // select the nuclear structure functions.
635 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
636 // =1: internal PYTHIA acording to MSTP(51)
637 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
638 // If the following mass number both not equal zero, nuclear corrections of the stf are used.
639 // MSTP(192) : Mass number of nucleus side 1
640 // MSTP(193) : Mass number of nucleus side 2
641 // MSTP(194) : Nuclear structure function: 0: EKS98 1:EPS08
649 AliPythia* AliPythia::Instance()
651 // Set random number generator
655 fgAliPythia = new AliPythia();
660 void AliPythia::PrintParticles()
662 // Print list of particl properties
664 char* name = new char[16];
665 for (Int_t kf=0; kf<1000000; kf++) {
666 for (Int_t c = 1; c > -2; c-=2) {
667 Int_t kc = Pycomp(c*kf);
669 Float_t mass = GetPMAS(kc,1);
670 Float_t width = GetPMAS(kc,2);
671 Float_t tau = GetPMAS(kc,4);
677 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
678 c*kf, name, mass, width, tau);
682 printf("\n Number of particles %d \n \n", np);
685 void AliPythia::ResetDecayTable()
687 // Set default values for pythia decay switches
689 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
690 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
693 void AliPythia::SetDecayTable()
695 // Set default values for pythia decay switches
698 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
699 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
702 void AliPythia::Pyclus(Int_t& njet)
704 // Call Pythia clustering algorithm
709 void AliPythia::Pycell(Int_t& njet)
711 // Call Pythia jet reconstruction algorithm
716 void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
718 // Call Pythia jet reconstruction algorithm
720 pyshow(ip1, ip2, qmax);
723 void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
725 pyrobo(imi, ima, the, phi, bex, bey, bez);
728 void AliPythia::Pytune(Int_t itune)
732 C ITUNE NAME (detailed descriptions below)
733 C 0 Default : No settings changed => linked Pythia version's defaults.
734 C ====== Old UE, Q2-ordered showers ==========================================
735 C 100 A : Rick Field's CDF Tune A
736 C 101 AW : Rick Field's CDF Tune AW
737 C 102 BW : Rick Field's CDF Tune BW
738 C 103 DW : Rick Field's CDF Tune DW
739 C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
740 C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
741 C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
742 C 107 ACR : Tune A modified with annealing CR
743 C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
744 C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
745 C ====== Intermediate Models =================================================
746 C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
747 C 201 APT : Tune A modified to use pT-ordered final-state showers
748 C ====== New UE, interleaved pT-ordered showers, annealing CR ================
749 C 300 S0 : Sandhoff-Skands Tune 0
750 C 301 S1 : Sandhoff-Skands Tune 1
751 C 302 S2 : Sandhoff-Skands Tune 2
752 C 303 S0A : S0 with "Tune A" UE energy scaling
753 C 304 NOCR : New UE "best try" without colour reconnections
754 C 305 Old : New UE, original (primitive) colour reconnections
755 C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
756 C ======= The Uppsala models =================================================
757 C ( NB! must be run with special modified Pythia 6.215 version )
758 C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
759 C 400 GAL 0 : Generalized area-law model. Old parameters
760 C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
761 C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
766 void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
767 // Inset 2-parton system at line idx
768 py2ent(idx, pdg1, pdg2, p);
772 void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
775 // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
776 // (2) The nuclear geometry using the Glauber Model
779 fGlauber = AliFastGlauber::Instance();
781 fGlauber->SetCentralityClass(cMin, cMax);
783 fQuenchingWeights = new AliQuenchingWeights();
784 fQuenchingWeights->InitMult();
785 fQuenchingWeights->SetK(k);
786 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
793 void AliPythia::Quench()
797 // Simple Jet Quenching routine:
798 // =============================
799 // The jet formed by all final state partons radiated by the parton created
800 // in the hard collisions is quenched by a factor (1-z) using light cone variables in
801 // the initial parton reference frame:
802 // (E + p_z)new = (1-z) (E + p_z)old
807 // The lost momentum is first balanced by one gluon with virtuality > 0.
808 // Subsequently the gluon splits to yield two gluons with E = p.
812 static Float_t eMean = 0.;
813 static Int_t icall = 0;
818 Int_t klast[4] = {-1, -1, -1, -1};
820 Int_t numpart = fPyjets->N;
821 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
822 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
830 // Sore information about Primary partons
833 // 0, 1 partons from hard scattering
834 // 2, 3 partons from initial state radiation
836 for (Int_t i = 2; i <= 7; i++) {
838 // Skip gluons that participate in hard scattering
839 if (i == 4 || i == 5) continue;
840 // Gluons from hard Scattering
841 if (i == 6 || i == 7) {
843 pxq[j] = fPyjets->P[0][i];
844 pyq[j] = fPyjets->P[1][i];
845 pzq[j] = fPyjets->P[2][i];
846 eq[j] = fPyjets->P[3][i];
847 mq[j] = fPyjets->P[4][i];
849 // Gluons from initial state radiation
851 // Obtain 4-momentum vector from difference between original parton and parton after gluon
852 // radiation. Energy is calculated independently because initial state radition does not
853 // conserve strictly momentum and energy for each partonic system independently.
855 // Not very clean. Should be improved !
859 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
860 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
861 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
862 mq[j] = fPyjets->P[4][i];
863 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
866 // Calculate some kinematic variables
868 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
869 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
870 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
871 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
872 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
873 qPdg[j] = fPyjets->K[1][i];
879 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
881 for (Int_t j = 0; j < 4; j++) {
883 // Quench only central jets and with E > 10.
887 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
888 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
890 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
893 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
899 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
900 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
902 // Fractional energy loss
903 fZQuench[j] = eloss / eq[j];
905 // Avoid complete loss
907 if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
909 // Some debug printing
912 // 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",
913 // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
915 // fZQuench[j] = 0.8;
916 // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
919 quenched[j] = (fZQuench[j] > 0.01);
924 Double_t pNew[1000][4];
931 for (Int_t isys = 0; isys < 4; isys++) {
932 // Skip to next system if not quenched.
933 if (!quenched[isys]) continue;
935 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
936 if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
937 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
938 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
944 Double_t pg[4] = {0., 0., 0., 0.};
947 // Loop on radiation events
949 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
952 for (Int_t k = 0; k < 4; k++)
959 for (Int_t i = 0; i < numpart; i++)
961 imo = fPyjets->K[2][i];
962 kst = fPyjets->K[0][i];
963 pdg = fPyjets->K[1][i];
967 // Quarks and gluons only
968 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
969 // Particles from hard scattering only
971 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
972 Int_t imom = imo % 1000;
973 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
974 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
977 // Skip comment lines
978 if (kst != 1 && kst != 2) continue;
981 px = fPyjets->P[0][i];
982 py = fPyjets->P[1][i];
983 pz = fPyjets->P[2][i];
984 e = fPyjets->P[3][i];
985 m = fPyjets->P[4][i];
986 pt = TMath::Sqrt(px * px + py * py);
987 p = TMath::Sqrt(px * px + py * py + pz * pz);
988 phi = TMath::Pi() + TMath::ATan2(-py, -px);
989 theta = TMath::ATan2(pt, pz);
992 // Save 4-momentum sum for balancing
1003 // Fractional energy loss
1004 Double_t z = zquench[index];
1007 // Don't fully quench radiated gluons
1010 // This small factor makes sure that the gluons are not too close in phase space to avoid recombination
1015 // printf("z: %d %f\n", imo, z);
1022 // Transform into frame in which initial parton is along z-axis
1024 TVector3 v(px, py, pz);
1025 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
1026 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
1028 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
1029 Double_t mt2 = jt * jt + m * m;
1032 // Kinematic limit on z
1034 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
1036 // Change light-cone kinematics rel. to initial parton
1038 Double_t eppzOld = e + pl;
1039 Double_t empzOld = e - pl;
1041 Double_t eppzNew = (1. - z) * eppzOld;
1042 Double_t empzNew = empzOld - mt2 * z / eppzOld;
1043 Double_t eNew = 0.5 * (eppzNew + empzNew);
1044 Double_t plNew = 0.5 * (eppzNew - empzNew);
1048 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
1049 Double_t mt2New = eppzNew * empzNew;
1050 if (mt2New < 1.e-8) mt2New = 0.;
1052 if (m * m > mt2New) {
1054 // This should not happen
1056 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
1059 jtNew = TMath::Sqrt(mt2New - m * m);
1062 // If pT is to small (probably a leading massive particle) we scale only the energy
1063 // This can cause negative masses of the radiated gluon
1064 // Let's hope for the best ...
1066 eNew = TMath::Sqrt(plNew * plNew + mt2);
1070 // Calculate new px, py
1076 pxNew = jtNew / jt * pxs;
1077 pyNew = jtNew / jt * pys;
1079 // Double_t dpx = pxs - pxNew;
1080 // Double_t dpy = pys - pyNew;
1081 // Double_t dpz = pl - plNew;
1082 // Double_t de = e - eNew;
1083 // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
1084 // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
1085 // printf("New mass (2) %e %e \n", pxNew, pyNew);
1089 TVector3 w(pxNew, pyNew, plNew);
1090 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
1091 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
1093 p1[index][0] += pxNew;
1094 p1[index][1] += pyNew;
1095 p1[index][2] += plNew;
1096 p1[index][3] += eNew;
1098 // Updated 4-momentum vectors
1100 pNew[icount][0] = pxNew;
1101 pNew[icount][1] = pyNew;
1102 pNew[icount][2] = plNew;
1103 pNew[icount][3] = eNew;
1108 // Check if there was phase-space for quenching
1111 if (icount == 0) quenched[isys] = kFALSE;
1112 if (!quenched[isys]) break;
1114 for (Int_t j = 0; j < 4; j++)
1116 p2[isys][j] = p0[isys][j] - p1[isys][j];
1118 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];
1119 if (p2[isys][4] > 0.) {
1120 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1123 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
1124 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]);
1125 if (p2[isys][4] < -0.01) {
1126 printf("Negative mass squared !\n");
1127 // Here we have to put the gluon back to mass shell
1128 // This will lead to a small energy imbalance
1130 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1139 printf("zHeavy lowered to %f\n", zHeavy);
1140 if (zHeavy < 0.01) {
1141 printf("No success ! \n");
1143 quenched[isys] = kFALSE;
1147 } // iteration on z (while)
1149 // Update event record
1150 for (Int_t k = 0; k < icount; k++) {
1151 // 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] );
1152 fPyjets->P[0][kNew[k]] = pNew[k][0];
1153 fPyjets->P[1][kNew[k]] = pNew[k][1];
1154 fPyjets->P[2][kNew[k]] = pNew[k][2];
1155 fPyjets->P[3][kNew[k]] = pNew[k][3];
1162 if (!quenched[isys]) continue;
1164 // Last parton from shower i
1165 Int_t in = klast[isys];
1167 // Continue if no parton in shower i selected
1168 if (in == -1) continue;
1170 // If this is the second initial parton and it is behind the first move pointer by previous ish
1171 if (isys == 1 && klast[1] > klast[0]) in += ish;
1176 // How many additional gluons will be generated
1178 if (p2[isys][4] > 0.05) ish = 2;
1180 // Position of gluons
1182 if (iglu == 0) igMin = iGlu;
1185 (fPyjets->N) += ish;
1188 fPyjets->P[0][iGlu] = p2[isys][0];
1189 fPyjets->P[1][iGlu] = p2[isys][1];
1190 fPyjets->P[2][iGlu] = p2[isys][2];
1191 fPyjets->P[3][iGlu] = p2[isys][3];
1192 fPyjets->P[4][iGlu] = p2[isys][4];
1194 fPyjets->K[0][iGlu] = 1;
1195 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
1196 fPyjets->K[1][iGlu] = 21;
1197 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1198 fPyjets->K[3][iGlu] = -1;
1199 fPyjets->K[4][iGlu] = -1;
1201 pg[0] += p2[isys][0];
1202 pg[1] += p2[isys][1];
1203 pg[2] += p2[isys][2];
1204 pg[3] += p2[isys][3];
1207 // Split gluon in rest frame.
1209 Double_t bx = p2[isys][0] / p2[isys][3];
1210 Double_t by = p2[isys][1] / p2[isys][3];
1211 Double_t bz = p2[isys][2] / p2[isys][3];
1212 Double_t pst = p2[isys][4] / 2.;
1214 // Isotropic decay ????
1215 Double_t cost = 2. * gRandom->Rndm() - 1.;
1216 Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
1217 Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
1219 Double_t pz1 = pst * cost;
1220 Double_t pz2 = -pst * cost;
1221 Double_t pt1 = pst * sint;
1222 Double_t pt2 = -pst * sint;
1223 Double_t px1 = pt1 * TMath::Cos(phis);
1224 Double_t py1 = pt1 * TMath::Sin(phis);
1225 Double_t px2 = pt2 * TMath::Cos(phis);
1226 Double_t py2 = pt2 * TMath::Sin(phis);
1228 fPyjets->P[0][iGlu] = px1;
1229 fPyjets->P[1][iGlu] = py1;
1230 fPyjets->P[2][iGlu] = pz1;
1231 fPyjets->P[3][iGlu] = pst;
1232 fPyjets->P[4][iGlu] = 0.;
1234 fPyjets->K[0][iGlu] = 1 ;
1235 fPyjets->K[1][iGlu] = 21;
1236 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1237 fPyjets->K[3][iGlu] = -1;
1238 fPyjets->K[4][iGlu] = -1;
1240 fPyjets->P[0][iGlu+1] = px2;
1241 fPyjets->P[1][iGlu+1] = py2;
1242 fPyjets->P[2][iGlu+1] = pz2;
1243 fPyjets->P[3][iGlu+1] = pst;
1244 fPyjets->P[4][iGlu+1] = 0.;
1246 fPyjets->K[0][iGlu+1] = 1;
1247 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
1248 fPyjets->K[1][iGlu+1] = 21;
1249 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
1250 fPyjets->K[3][iGlu+1] = -1;
1251 fPyjets->K[4][iGlu+1] = -1;
1257 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1260 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1261 Double_t px, py, pz;
1262 px = fPyjets->P[0][ig];
1263 py = fPyjets->P[1][ig];
1264 pz = fPyjets->P[2][ig];
1265 TVector3 v(px, py, pz);
1266 v.RotateZ(-phiq[isys]);
1267 v.RotateY(-thetaq[isys]);
1268 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1269 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1270 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1271 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1272 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1273 pxs += jtKick * TMath::Cos(phiKick);
1274 pys += jtKick * TMath::Sin(phiKick);
1275 TVector3 w(pxs, pys, pzs);
1276 w.RotateY(thetaq[isys]);
1277 w.RotateZ(phiq[isys]);
1278 fPyjets->P[0][ig] = w.X();
1279 fPyjets->P[1][ig] = w.Y();
1280 fPyjets->P[2][ig] = w.Z();
1281 fPyjets->P[2][ig] = w.Mag();
1287 // Check energy conservation
1291 Double_t es = 14000.;
1293 for (Int_t i = 0; i < numpart; i++)
1295 kst = fPyjets->K[0][i];
1296 if (kst != 1 && kst != 2) continue;
1297 pxs += fPyjets->P[0][i];
1298 pys += fPyjets->P[1][i];
1299 pzs += fPyjets->P[2][i];
1300 es -= fPyjets->P[3][i];
1302 if (TMath::Abs(pxs) > 1.e-2 ||
1303 TMath::Abs(pys) > 1.e-2 ||
1304 TMath::Abs(pzs) > 1.e-1) {
1305 printf("%e %e %e %e\n", pxs, pys, pzs, es);
1306 // Fatal("Quench()", "4-Momentum non-conservation");
1309 } // end quenching loop (systems)
1311 for (Int_t i = 0; i < numpart; i++)
1313 imo = fPyjets->K[2][i];
1315 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1322 void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1324 // Igor Lokthine's quenching routine
1325 // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1330 void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1332 // Set the parameters for the PYQUEN package.
1333 // See comments in PyquenCommon.h
1339 PYQPAR.iengl = iengl;
1340 PYQPAR.iangl = iangl;
1344 void AliPythia::Pyevnw()
1346 // New multiple interaction scenario
1350 void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
1352 // Call medium-modified Pythia jet reconstruction algorithm
1354 pyshowq(ip1, ip2, qmax);
1357 void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1359 // Return event specific quenching parameters
1362 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1366 void AliPythia::ConfigHeavyFlavor()
1369 // Default configuration for Heavy Flavor production
1371 // All QCD processes
1375 // No multiple interactions
1379 // Initial/final parton shower on (Pythia default)
1383 // 2nd order alpha_s
1391 void AliPythia::AtlasTuning()
1394 // Configuration for the ATLAS tuning
1395 if (fItune > -1) return;
1396 printf("ATLAS TUNE \n");
1398 SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
1399 SetMSTP(81,1); // Multiple Interactions ON
1400 SetMSTP(82,4); // Double Gaussian Model
1401 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
1402 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1403 SetPARP(89,1000.); // [GeV] Ref. energy
1404 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1405 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1406 SetPARP(84,0.5); // Core radius
1407 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1408 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1409 SetPARP(67,1); // Regulates Initial State Radiation
1412 void AliPythia::AtlasTuning_MC09()
1415 // Configuration for the ATLAS tuning
1416 if (fItune > -1) return;
1417 printf("ATLAS New TUNE MC09\n");
1418 SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
1419 SetMSTP(82, 4); // Double Gaussian Model
1420 SetMSTP(52, 2); // External PDF
1421 SetMSTP(51, 20650); // MRST LO*
1424 SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
1425 SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
1426 SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
1427 SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
1429 SetPARP(78, 0.3); // the amount of color reconnection in the final state
1430 SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
1431 SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
1432 SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
1433 SetPARP(84, 0.7); // Core radius
1434 SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
1435 SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
1438 SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
1440 SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
1441 SetPARP(89,1800.); // [GeV] Ref. energy
1444 AliPythia& AliPythia::operator=(const AliPythia& rhs)
1446 // Assignment operator
1451 void AliPythia::Copy(TObject&) const
1456 Fatal("Copy","Not implemented!\n");