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 "AliFastGlauber.h"
21 #include "AliQuenchingWeights.h"
22 #include "AliOmegaDalitz.h"
25 #include "TLorentzVector.h"
26 #include "PyquenCommon.h"
31 # define pyclus pyclus_
32 # define pycell pycell_
33 # define pyshow pyshow_
34 # define pyrobo pyrobo_
35 # define pyquen pyquen_
36 # define pyevnw pyevnw_
37 # define pyshowq pyshowq_
38 # define qpygin0 qpygin0_
39 # define pytune pytune_
40 # define py2ent py2ent_
43 # define pyclus PYCLUS
44 # define pycell PYCELL
45 # define pyrobo PYROBO
46 # define pyquen PYQUEN
47 # define pyevnw PYEVNW
48 # define pyshowq PYSHOWQ
49 # define qpygin0 QPYGIN0
50 # define pytune PYTUNE
51 # define py2ent PY2ENT
52 # define type_of_call _stdcall
55 extern "C" void type_of_call pyclus(Int_t & );
56 extern "C" void type_of_call pycell(Int_t & );
57 extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
58 extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
59 extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
60 extern "C" void type_of_call pyevnw();
61 extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
62 extern "C" void type_of_call pytune(Int_t &);
63 extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
64 extern "C" void type_of_call qpygin0();
65 //_____________________________________________________________________________
67 AliPythia* AliPythia::fgAliPythia=NULL;
69 AliPythia::AliPythia():
84 // Default Constructor
87 if (!AliPythiaRndm::GetPythiaRandom())
88 AliPythiaRndm::SetPythiaRandom(GetRandom());
90 fQuenchingWeights = 0;
92 for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
93 for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
94 for (i = 0; i < 4; i++) fZQuench[i] = 0;
97 AliPythia::AliPythia(const AliPythia& pythia):
110 fQuenchingWeights(0),
116 for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
117 for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
118 for (i = 0; i < 4; i++) fZQuench[i] = 0;
122 void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
124 // Initialise the process to generate
125 if (!AliPythiaRndm::GetPythiaRandom())
126 AliPythiaRndm::SetPythiaRandom(GetRandom());
132 fStrucFunc = strucfunc;
133 //...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
134 SetMDCY(Pycomp(111) ,1,0); // pi0
135 SetMDCY(Pycomp(310) ,1,0); // K0S
136 SetMDCY(Pycomp(3122),1,0); // kLambda
137 SetMDCY(Pycomp(3112),1,0); // sigma -
138 SetMDCY(Pycomp(3222),1,0); // sigma +
139 SetMDCY(Pycomp(3312),1,0); // xi -
140 SetMDCY(Pycomp(3322),1,0); // xi 0
141 SetMDCY(Pycomp(3334),1,0); // omega-
142 // Select structure function
144 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
145 // Particles produced in string fragmentation point directly to either of the two endpoints
146 // of the string (depending in the side they were generated from).
150 // Pythia initialisation for selected processes//
154 for (Int_t i=1; i<= 200; i++) {
157 // select charm production
160 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
161 // Multiple interactions on.
163 // Double Gaussian matter distribution.
169 // Reference energy for pT0 and energy rescaling pace.
172 // String drawing almost completely minimizes string length.
175 // ISR and FSR activity.
181 case kPyOldUEQ2ordered2:
182 // Old underlying events with Q2 ordered QCD processes
183 // Multiple interactions on.
185 // Double Gaussian matter distribution.
191 // Reference energy for pT0 and energy rescaling pace.
193 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
194 // String drawing almost completely minimizes string length.
197 // ISR and FSR activity.
204 // Old production mechanism: Old Popcorn
207 // (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
209 // (D=1)see can be used to form baryons (BARYON JUNCTION)
215 // heavy quark masses
245 case kPyCharmUnforced:
254 case kPyBeautyUnforced:
264 // Minimum Bias pp-Collisions
267 // select Pythia min. bias model
269 SetMSUB(92,1); // single diffraction AB-->XB
270 SetMSUB(93,1); // single diffraction AB-->AX
271 SetMSUB(94,1); // double diffraction
272 SetMSUB(95,1); // low pt production
277 case kPyMbAtlasTuneMC09:
278 // Minimum Bias pp-Collisions
281 // select Pythia min. bias model
283 SetMSUB(92,1); // single diffraction AB-->XB
284 SetMSUB(93,1); // single diffraction AB-->AX
285 SetMSUB(94,1); // double diffraction
286 SetMSUB(95,1); // low pt production
291 case kPyMbWithDirectPhoton:
292 // Minimum Bias pp-Collisions with direct photon processes added
295 // select Pythia min. bias model
297 SetMSUB(92,1); // single diffraction AB-->XB
298 SetMSUB(93,1); // single diffraction AB-->AX
299 SetMSUB(94,1); // double diffraction
300 SetMSUB(95,1); // low pt production
313 // Minimum Bias pp-Collisions
316 // select Pythia min. bias model
318 SetMSUB(92,1); // single diffraction AB-->XB
319 SetMSUB(93,1); // single diffraction AB-->AX
320 SetMSUB(94,1); // double diffraction
321 SetMSUB(95,1); // low pt production
324 // Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
325 // -> Pythia 6.3 or above is needed
328 SetMSUB(92,1); // single diffraction AB-->XB
329 SetMSUB(93,1); // single diffraction AB-->AX
330 SetMSUB(94,1); // double diffraction
331 SetMSUB(95,1); // low pt production
333 SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
337 SetMSTP(81,1); // Multiple Interactions ON
338 SetMSTP(82,4); // Double Gaussian Model
341 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
342 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
343 SetPARP(84,0.5); // Core radius
344 SetPARP(85,0.9); // Regulates gluon prod. mechanism
345 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
349 // Minimum Bias pp-Collisions
352 // select Pythia min. bias model
354 SetMSUB(95,1); // low pt production
361 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
362 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
363 SetPARP(93,5.); // Upper cut-off
365 SetPMAS(4,1,1.2); // Charm quark mass
366 SetPMAS(5,1,4.78); // Beauty quark mass
367 SetPARP(71,4.); // Defaut value
376 // Pythia Tune A (CDF)
379 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
380 SetMSTP(82,4); // Double Gaussian Model
381 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
382 SetPARP(84,0.4); // Core radius
383 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
384 SetPARP(86,0.95); // Regulates gluon prod. mechanism
385 SetPARP(89,1800.); // [GeV] Ref. energy
386 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
392 case kPyCharmPbPbMNR:
394 case kPyDPlusPbPbMNR:
395 case kPyDPlusStrangePbPbMNR:
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 Pb-Pb 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.
414 case kPyDPlusStrangepPbMNR:
415 // Tuning of Pythia parameters aimed to get a resonable agreement
416 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
417 // c-cbar single inclusive and double differential distributions.
418 // This parameter settings are meant to work with p-Pb collisions
419 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
420 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
421 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
434 case kPyDPlusStrangeppMNR:
435 case kPyLambdacppMNR:
436 // Tuning of Pythia parameters aimed to get a resonable agreement
437 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
438 // c-cbar single inclusive and double differential distributions.
439 // This parameter settings are meant to work with pp collisions
440 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
441 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
442 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
452 case kPyCharmppMNRwmi:
453 // Tuning of Pythia parameters aimed to get a resonable agreement
454 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
455 // c-cbar single inclusive and double differential distributions.
456 // This parameter settings are meant to work with pp collisions
457 // and with kCTEQ5L PDFs.
458 // Added multiple interactions according to ATLAS tune settings.
459 // To get a "reasonable" agreement with MNR results, events have to be
460 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
462 // To get a "perfect" agreement with MNR results, events have to be
463 // generated in four ptHard bins with the following relative
479 case kPyBeautyPbPbMNR:
480 // Tuning of Pythia parameters aimed to get a resonable agreement
481 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
482 // b-bbar single inclusive and double differential distributions.
483 // This parameter settings are meant to work with Pb-Pb collisions
484 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
485 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
486 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
498 case kPyBeautypPbMNR:
499 // Tuning of Pythia parameters aimed to get a resonable agreement
500 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
501 // b-bbar single inclusive and double differential distributions.
502 // This parameter settings are meant to work with p-Pb collisions
503 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
504 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
505 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
518 // Tuning of Pythia parameters aimed to get a resonable agreement
519 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
520 // b-bbar single inclusive and double differential distributions.
521 // This parameter settings are meant to work with pp collisions
522 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
523 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
524 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
539 case kPyBeautyppMNRwmi:
540 // Tuning of Pythia parameters aimed to get a resonable agreement
541 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
542 // b-bbar single inclusive and double differential distributions.
543 // This parameter settings are meant to work with pp collisions
544 // and with kCTEQ5L PDFs.
545 // Added multiple interactions according to ATLAS tune settings.
546 // To get a "reasonable" agreement with MNR results, events have to be
547 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
549 // To get a "perfect" agreement with MNR results, events have to be
550 // generated in four ptHard bins with the following relative
573 //Inclusive production of W+/-
579 // //f fbar -> gamma W+
586 // Initial/final parton shower on (Pythia default)
587 // With parton showers on we are generating "W inclusive process"
588 SetMSTP(61,1); //Initial QCD & QED showers on
589 SetMSTP(71,1); //Final QCD & QED showers on
595 //Inclusive production of Z
600 // // f fbar -> g Z/gamma
602 // // f fbar -> gamma Z/gamma
604 // // f g -> f Z/gamma
606 // // f gamma -> f Z/gamma
609 //only Z included, not gamma
612 // Initial/final parton shower on (Pythia default)
613 // With parton showers on we are generating "Z inclusive process"
614 SetMSTP(61,1); //Initial QCD & QED showers on
615 SetMSTP(71,1); //Final QCD & QED showers on
619 //Inclusive production of Z
623 // Initial/final parton shower on (Pythia default)
624 // With parton showers on we are generating "Z inclusive process"
625 SetMSTP(61,1); //Initial QCD & QED showers on
626 SetMSTP(71,1); //Final QCD & QED showers on
628 case kPyMBRSingleDiffraction:
629 case kPyMBRDoubleDiffraction:
630 case kPyMBRCentralDiffraction:
635 // For the case of jet production the following parameter setting
636 // limits the transverse momentum of secondary scatterings, due
637 // to multiple parton interactions, to be less than that of the
638 // primary interaction (see POWHEG Dijet paper arXiv:1012.3380
639 // [hep-ph] sec. 4.1 and also the PYTHIA Manual).
642 // maximum number of errors before pythia aborts (def=10)
644 // number of warnings printed on the shell
651 // number of warnings printed on the shell
662 if (GetMSTP(192) > 1 || GetMSTP(193) > 1) {
663 AliWarning(Form("Structure function for tune %5d set to %5s\n",
664 itune, AliStructFuncType::PDFsetName(strucfunc).Data()));
666 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
670 SetMSTP(41,1); // all resonance decays switched on
671 if (process == kPyJetsPWHG || process == kPyCharmPWHG || process == kPyBeautyPWHG || process == kPyWPWHG) {
672 Initialize("USER","","",0.);
674 Initialize("CMS",fProjectile,fTarget,fEcms);
679 Int_t AliPythia::CheckedLuComp(Int_t kf)
681 // Check Lund particle code (for debugging)
683 printf("\n Lucomp kf,kc %d %d",kf,kc);
687 void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
689 // Treat protons as inside nuclei with mass numbers a1 and a2
690 // The MSTP array in the PYPARS common block is used to enable and
691 // select the nuclear structure functions.
692 // MSTP(52) : (D=1) choice of proton and nuclear structure-function library
693 // =1: internal PYTHIA acording to MSTP(51)
694 // =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
695 // If the following mass number both not equal zero, nuclear corrections of the stf are used.
696 // MSTP(192) : Mass number of nucleus side 1
697 // MSTP(193) : Mass number of nucleus side 2
698 // MSTP(194) : Nuclear structure function: 0: EKS98 8:EPS08 9:EPS09LO 19:EPS09NLO
706 AliPythia* AliPythia::Instance()
708 // Set random number generator
712 fgAliPythia = new AliPythia();
717 void AliPythia::PrintParticles()
719 // Print list of particl properties
721 char* name = new char[16];
722 for (Int_t kf=0; kf<1000000; kf++) {
723 for (Int_t c = 1; c > -2; c-=2) {
724 Int_t kc = Pycomp(c*kf);
726 Float_t mass = GetPMAS(kc,1);
727 Float_t width = GetPMAS(kc,2);
728 Float_t tau = GetPMAS(kc,4);
734 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
735 c*kf, name, mass, width, tau);
739 printf("\n Number of particles %d \n \n", np);
742 void AliPythia::ResetDecayTable()
744 // Set default values for pythia decay switches
746 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
747 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
750 void AliPythia::SetDecayTable()
752 // Set default values for pythia decay switches
755 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
756 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
759 void AliPythia::Pyclus(Int_t& njet)
761 // Call Pythia clustering algorithm
766 void AliPythia::Pycell(Int_t& njet)
768 // Call Pythia jet reconstruction algorithm
773 void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
775 // Call Pythia jet reconstruction algorithm
777 pyshow(ip1, ip2, qmax);
780 void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
782 pyrobo(imi, ima, the, phi, bex, bey, bez);
785 void AliPythia::Pytune(Int_t itune)
789 C ITUNE NAME (detailed descriptions below)
790 C 0 Default : No settings changed => linked Pythia version's defaults.
791 C ====== Old UE, Q2-ordered showers ==========================================
792 C 100 A : Rick Field's CDF Tune A
793 C 101 AW : Rick Field's CDF Tune AW
794 C 102 BW : Rick Field's CDF Tune BW
795 C 103 DW : Rick Field's CDF Tune DW
796 C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
797 C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
798 C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
799 C 107 ACR : Tune A modified with annealing CR
800 C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
801 C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
802 C ====== Intermediate Models =================================================
803 C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
804 C 201 APT : Tune A modified to use pT-ordered final-state showers
805 C ====== New UE, interleaved pT-ordered showers, annealing CR ================
806 C 300 S0 : Sandhoff-Skands Tune 0
807 C 301 S1 : Sandhoff-Skands Tune 1
808 C 302 S2 : Sandhoff-Skands Tune 2
809 C 303 S0A : S0 with "Tune A" UE energy scaling
810 C 304 NOCR : New UE "best try" without colour reconnections
811 C 305 Old : New UE, original (primitive) colour reconnections
812 C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
813 C ======= The Uppsala models =================================================
814 C ( NB! must be run with special modified Pythia 6.215 version )
815 C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
816 C 400 GAL 0 : Generalized area-law model. Old parameters
817 C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
818 C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
823 void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
824 // Inset 2-parton system at line idx
825 py2ent(idx, pdg1, pdg2, p);
829 void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
832 // (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
833 // (2) The nuclear geometry using the Glauber Model
836 fGlauber = AliFastGlauber::Instance();
838 fGlauber->SetCentralityClass(cMin, cMax);
840 fQuenchingWeights = new AliQuenchingWeights();
841 fQuenchingWeights->InitMult();
842 fQuenchingWeights->SetK(k);
843 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
850 void AliPythia::Quench()
854 // Simple Jet Quenching routine:
855 // =============================
856 // The jet formed by all final state partons radiated by the parton created
857 // in the hard collisions is quenched by a factor (1-z) using light cone variables in
858 // the initial parton reference frame:
859 // (E + p_z)new = (1-z) (E + p_z)old
864 // The lost momentum is first balanced by one gluon with virtuality > 0.
865 // Subsequently the gluon splits to yield two gluons with E = p.
869 static Float_t eMean = 0.;
870 static Int_t icall = 0;
875 Int_t klast[4] = {-1, -1, -1, -1};
877 Int_t numpart = fPyjets->N;
878 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
879 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
881 Double_t wjtKick[4] = {0., 0., 0., 0.};
887 // Sore information about Primary partons
890 // 0, 1 partons from hard scattering
891 // 2, 3 partons from initial state radiation
893 for (Int_t i = 2; i <= 7; i++) {
895 // Skip gluons that participate in hard scattering
896 if (i == 4 || i == 5) continue;
897 // Gluons from hard Scattering
898 if (i == 6 || i == 7) {
900 pxq[j] = fPyjets->P[0][i];
901 pyq[j] = fPyjets->P[1][i];
902 pzq[j] = fPyjets->P[2][i];
903 eq[j] = fPyjets->P[3][i];
904 mq[j] = fPyjets->P[4][i];
906 // Gluons from initial state radiation
908 // Obtain 4-momentum vector from difference between original parton and parton after gluon
909 // radiation. Energy is calculated independently because initial state radition does not
910 // conserve strictly momentum and energy for each partonic system independently.
912 // Not very clean. Should be improved !
916 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
917 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
918 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
919 mq[j] = fPyjets->P[4][i];
920 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
923 // Calculate some kinematic variables
925 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
926 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
927 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
928 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
929 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
930 qPdg[j] = fPyjets->K[1][i];
936 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
938 for (Int_t j = 0; j < 4; j++) {
940 // Quench only central jets and with E > 10.
944 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
945 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
947 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
950 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
956 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
957 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
959 // Fractional energy loss
960 fZQuench[j] = eloss / eq[j];
962 // Avoid complete loss
964 if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
966 // Some debug printing
969 // 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",
970 // j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
972 // fZQuench[j] = 0.8;
973 // while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
976 quenched[j] = (fZQuench[j] > 0.01);
981 Double_t pNew[1000][4];
988 for (Int_t isys = 0; isys < 4; isys++) {
989 // Skip to next system if not quenched.
990 if (!quenched[isys]) continue;
992 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
993 if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
994 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
995 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
1001 Double_t pg[4] = {0., 0., 0., 0.};
1004 // Loop on radiation events
1006 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
1009 for (Int_t k = 0; k < 4; k++)
1015 // Loop over partons
1016 for (Int_t i = 0; i < numpart; i++)
1018 imo = fPyjets->K[2][i];
1019 kst = fPyjets->K[0][i];
1020 pdg = fPyjets->K[1][i];
1024 // Quarks and gluons only
1025 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
1026 // Particles from hard scattering only
1028 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
1029 Int_t imom = imo % 1000;
1030 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
1031 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
1034 // Skip comment lines
1035 if (kst != 1 && kst != 2) continue;
1038 px = fPyjets->P[0][i];
1039 py = fPyjets->P[1][i];
1040 pz = fPyjets->P[2][i];
1041 e = fPyjets->P[3][i];
1042 m = fPyjets->P[4][i];
1043 pt = TMath::Sqrt(px * px + py * py);
1044 p = TMath::Sqrt(px * px + py * py + pz * pz);
1045 phi = TMath::Pi() + TMath::ATan2(-py, -px);
1046 theta = TMath::ATan2(pt, pz);
1049 // Save 4-momentum sum for balancing
1060 // Fractional energy loss
1061 Double_t z = zquench[index];
1064 // Don't fully quench radiated gluons
1067 // This small factor makes sure that the gluons are not too close in phase space to avoid recombination
1072 // printf("z: %d %f\n", imo, z);
1079 // Transform into frame in which initial parton is along z-axis
1081 TVector3 v(px, py, pz);
1082 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
1083 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
1085 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
1086 Double_t mt2 = jt * jt + m * m;
1089 // Kinematic limit on z
1091 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
1093 // Change light-cone kinematics rel. to initial parton
1095 Double_t eppzOld = e + pl;
1096 Double_t empzOld = e - pl;
1098 Double_t eppzNew = (1. - z) * eppzOld;
1099 Double_t empzNew = empzOld - mt2 * z / eppzOld;
1100 Double_t eNew = 0.5 * (eppzNew + empzNew);
1101 Double_t plNew = 0.5 * (eppzNew - empzNew);
1105 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
1106 Double_t mt2New = eppzNew * empzNew;
1107 if (mt2New < 1.e-8) mt2New = 0.;
1109 if (m * m > mt2New) {
1111 // This should not happen
1113 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
1116 jtNew = TMath::Sqrt(mt2New - m * m);
1119 // If pT is to small (probably a leading massive particle) we scale only the energy
1120 // This can cause negative masses of the radiated gluon
1121 // Let's hope for the best ...
1123 eNew = TMath::Sqrt(plNew * plNew + mt2);
1127 // Calculate new px, py
1133 pxNew = jtNew / jt * pxs;
1134 pyNew = jtNew / jt * pys;
1136 // Double_t dpx = pxs - pxNew;
1137 // Double_t dpy = pys - pyNew;
1138 // Double_t dpz = pl - plNew;
1139 // Double_t de = e - eNew;
1140 // Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
1141 // printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
1142 // printf("New mass (2) %e %e \n", pxNew, pyNew);
1146 TVector3 w(pxNew, pyNew, plNew);
1147 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
1148 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
1150 p1[index][0] += pxNew;
1151 p1[index][1] += pyNew;
1152 p1[index][2] += plNew;
1153 p1[index][3] += eNew;
1155 // Updated 4-momentum vectors
1157 pNew[icount][0] = pxNew;
1158 pNew[icount][1] = pyNew;
1159 pNew[icount][2] = plNew;
1160 pNew[icount][3] = eNew;
1165 // Check if there was phase-space for quenching
1168 if (icount == 0) quenched[isys] = kFALSE;
1169 if (!quenched[isys]) break;
1171 for (Int_t j = 0; j < 4; j++)
1173 p2[isys][j] = p0[isys][j] - p1[isys][j];
1175 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];
1176 if (p2[isys][4] > 0.) {
1177 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1180 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
1181 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]);
1182 if (p2[isys][4] < -0.01) {
1183 printf("Negative mass squared !\n");
1184 // Here we have to put the gluon back to mass shell
1185 // This will lead to a small energy imbalance
1187 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1196 printf("zHeavy lowered to %f\n", zHeavy);
1197 if (zHeavy < 0.01) {
1198 printf("No success ! \n");
1200 quenched[isys] = kFALSE;
1204 } // iteration on z (while)
1206 // Update event record
1207 for (Int_t k = 0; k < icount; k++) {
1208 // 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] );
1209 fPyjets->P[0][kNew[k]] = pNew[k][0];
1210 fPyjets->P[1][kNew[k]] = pNew[k][1];
1211 fPyjets->P[2][kNew[k]] = pNew[k][2];
1212 fPyjets->P[3][kNew[k]] = pNew[k][3];
1219 if (!quenched[isys]) continue;
1221 // Last parton from shower i
1222 Int_t in = klast[isys];
1224 // Continue if no parton in shower i selected
1225 if (in == -1) continue;
1227 // If this is the second initial parton and it is behind the first move pointer by previous ish
1228 if (isys == 1 && klast[1] > klast[0]) in += ish;
1233 // How many additional gluons will be generated
1235 if (p2[isys][4] > 0.05) ish = 2;
1237 // Position of gluons
1239 if (iglu == 0) igMin = iGlu;
1242 (fPyjets->N) += ish;
1245 fPyjets->P[0][iGlu] = p2[isys][0];
1246 fPyjets->P[1][iGlu] = p2[isys][1];
1247 fPyjets->P[2][iGlu] = p2[isys][2];
1248 fPyjets->P[3][iGlu] = p2[isys][3];
1249 fPyjets->P[4][iGlu] = p2[isys][4];
1251 fPyjets->K[0][iGlu] = 1;
1252 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
1253 fPyjets->K[1][iGlu] = 21;
1254 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1255 fPyjets->K[3][iGlu] = -1;
1256 fPyjets->K[4][iGlu] = -1;
1258 pg[0] += p2[isys][0];
1259 pg[1] += p2[isys][1];
1260 pg[2] += p2[isys][2];
1261 pg[3] += p2[isys][3];
1264 // Split gluon in rest frame.
1266 Double_t bx = p2[isys][0] / p2[isys][3];
1267 Double_t by = p2[isys][1] / p2[isys][3];
1268 Double_t bz = p2[isys][2] / p2[isys][3];
1269 Double_t pst = p2[isys][4] / 2.;
1271 // Isotropic decay ????
1272 Double_t cost = 2. * gRandom->Rndm() - 1.;
1273 Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
1274 Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
1276 Double_t pz1 = pst * cost;
1277 Double_t pz2 = -pst * cost;
1278 Double_t pt1 = pst * sint;
1279 Double_t pt2 = -pst * sint;
1280 Double_t px1 = pt1 * TMath::Cos(phis);
1281 Double_t py1 = pt1 * TMath::Sin(phis);
1282 Double_t px2 = pt2 * TMath::Cos(phis);
1283 Double_t py2 = pt2 * TMath::Sin(phis);
1285 fPyjets->P[0][iGlu] = px1;
1286 fPyjets->P[1][iGlu] = py1;
1287 fPyjets->P[2][iGlu] = pz1;
1288 fPyjets->P[3][iGlu] = pst;
1289 fPyjets->P[4][iGlu] = 0.;
1291 fPyjets->K[0][iGlu] = 1 ;
1292 fPyjets->K[1][iGlu] = 21;
1293 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1294 fPyjets->K[3][iGlu] = -1;
1295 fPyjets->K[4][iGlu] = -1;
1297 fPyjets->P[0][iGlu+1] = px2;
1298 fPyjets->P[1][iGlu+1] = py2;
1299 fPyjets->P[2][iGlu+1] = pz2;
1300 fPyjets->P[3][iGlu+1] = pst;
1301 fPyjets->P[4][iGlu+1] = 0.;
1303 fPyjets->K[0][iGlu+1] = 1;
1304 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
1305 fPyjets->K[1][iGlu+1] = 21;
1306 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
1307 fPyjets->K[3][iGlu+1] = -1;
1308 fPyjets->K[4][iGlu+1] = -1;
1314 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1317 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1318 Double_t px, py, pz;
1319 px = fPyjets->P[0][ig];
1320 py = fPyjets->P[1][ig];
1321 pz = fPyjets->P[2][ig];
1322 TVector3 v(px, py, pz);
1323 v.RotateZ(-phiq[isys]);
1324 v.RotateY(-thetaq[isys]);
1325 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1326 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1327 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1328 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1329 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1330 pxs += jtKick * TMath::Cos(phiKick);
1331 pys += jtKick * TMath::Sin(phiKick);
1332 TVector3 w(pxs, pys, pzs);
1333 w.RotateY(thetaq[isys]);
1334 w.RotateZ(phiq[isys]);
1335 fPyjets->P[0][ig] = w.X();
1336 fPyjets->P[1][ig] = w.Y();
1337 fPyjets->P[2][ig] = w.Z();
1338 fPyjets->P[2][ig] = w.Mag();
1344 // Check energy conservation
1348 Double_t es = 14000.;
1350 for (Int_t i = 0; i < numpart; i++)
1352 kst = fPyjets->K[0][i];
1353 if (kst != 1 && kst != 2) continue;
1354 pxs += fPyjets->P[0][i];
1355 pys += fPyjets->P[1][i];
1356 pzs += fPyjets->P[2][i];
1357 es -= fPyjets->P[3][i];
1359 if (TMath::Abs(pxs) > 1.e-2 ||
1360 TMath::Abs(pys) > 1.e-2 ||
1361 TMath::Abs(pzs) > 1.e-1) {
1362 printf("%e %e %e %e\n", pxs, pys, pzs, es);
1363 // Fatal("Quench()", "4-Momentum non-conservation");
1366 } // end quenching loop (systems)
1368 for (Int_t i = 0; i < numpart; i++)
1370 imo = fPyjets->K[2][i];
1372 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1379 void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1381 // Igor Lokthine's quenching routine
1382 // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1387 void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1389 // Set the parameters for the PYQUEN package.
1390 // See comments in PyquenCommon.h
1396 PYQPAR.iengl = iengl;
1397 PYQPAR.iangl = iangl;
1401 void AliPythia::Pyevnw()
1403 // New multiple interaction scenario
1407 void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
1409 // Call medium-modified Pythia jet reconstruction algorithm
1411 pyshowq(ip1, ip2, qmax);
1413 void AliPythia::Qpygin0()
1415 // New multiple interaction scenario
1419 void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1421 // Return event specific quenching parameters
1424 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1428 void AliPythia::ConfigHeavyFlavor()
1431 // Default configuration for Heavy Flavor production
1433 // All QCD processes
1439 // No multiple interactions
1444 // Initial/final parton shower on (Pythia default)
1448 // 2nd order alpha_s
1456 void AliPythia::AtlasTuning()
1459 // Configuration for the ATLAS tuning
1460 if (fItune > -1) return;
1461 printf("ATLAS TUNE \n");
1463 SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
1464 SetMSTP(81,1); // Multiple Interactions ON
1465 SetMSTP(82,4); // Double Gaussian Model
1466 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
1467 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1468 SetPARP(89,1000.); // [GeV] Ref. energy
1469 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1470 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1471 SetPARP(84,0.5); // Core radius
1472 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1473 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1474 SetPARP(67,1); // Regulates Initial State Radiation
1477 void AliPythia::AtlasTuningMC09()
1480 // Configuration for the ATLAS tuning
1481 if (fItune > -1) return;
1482 printf("ATLAS New TUNE MC09\n");
1483 SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
1484 SetMSTP(82, 4); // Double Gaussian Model
1485 SetMSTP(52, 2); // External PDF
1486 SetMSTP(51, 20650); // MRST LO*
1489 SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
1490 SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
1491 SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
1492 SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
1494 SetPARP(78, 0.3); // the amount of color reconnection in the final state
1495 SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
1496 SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
1497 SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
1498 SetPARP(84, 0.7); // Core radius
1499 SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
1500 SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
1503 SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
1505 SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
1506 SetPARP(89,1800.); // [GeV] Ref. energy
1509 AliPythia& AliPythia::operator=(const AliPythia& rhs)
1511 // Assignment operator
1516 void AliPythia::Copy(TObject&) const
1521 Fatal("Copy","Not implemented!\n");
1524 void AliPythia::DalitzDecays()
1528 // Replace all omega dalitz decays with the correct matrix element decays
1530 Int_t nt = fPyjets->N;
1531 for (Int_t i = 0; i < nt; i++) {
1532 if (fPyjets->K[1][i] != 223) continue;
1533 Int_t fd = fPyjets->K[3][i] - 1;
1534 Int_t ld = fPyjets->K[4][i] - 1;
1535 if (fd < 0) continue;
1536 if ((ld - fd) != 2) continue;
1537 if ((fPyjets->K[1][fd] != 111) ||
1538 ((TMath::Abs(fPyjets->K[1][fd+1]) != 11) && (TMath::Abs(fPyjets->K[1][fd+1]) != 13)))
1540 TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1541 Int_t pdg = TMath::Abs(fPyjets->K[1][fd+1]);
1542 fOmegaDalitz.Decay(pdg, &omega);
1543 for (Int_t j = 0; j < 3; j++) {
1544 for (Int_t k = 0; k < 4; k++) {
1545 TLorentzVector vec = (fOmegaDalitz.Products())[2-j];
1546 fPyjets->P[k][fd+j] = vec[k];