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Some code duplication in Pythia configuration removed.
[u/mrichter/AliRoot.git] / PYTHIA6 / AliPythia.cxx
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8d2cd130 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
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 **************************************************************************/
15
7cdba479 16/* $Id$ */
8d2cd130 17
18#include "AliPythia.h"
7cdba479 19#include "AliPythiaRndm.h"
0f482ae4 20#include "../FASTSIM/AliFastGlauber.h"
21#include "../FASTSIM/AliQuenchingWeights.h"
22#include "TVector3.h"
8d2cd130 23
24ClassImp(AliPythia)
25
26#ifndef WIN32
27# define pyclus pyclus_
28# define pycell pycell_
452af8c7 29# define pyshow pyshow_
30# define pyrobo pyrobo_
992f2843 31# define pyquen pyquen_
16a82508 32# define pyevnw pyevnw_
8d2cd130 33# define type_of_call
34#else
35# define pyclus PYCLUS
36# define pycell PYCELL
452af8c7 37# define pyrobo PYROBO
992f2843 38# define pyquen PYQUEN
16a82508 39# define pyevnw PYEVNW
8d2cd130 40# define type_of_call _stdcall
41#endif
42
43extern "C" void type_of_call pyclus(Int_t & );
44extern "C" void type_of_call pycell(Int_t & );
452af8c7 45extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
46extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
992f2843 47extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
0a2cfc0a 48extern "C" void type_of_call pyevnw(){;}
8d2cd130 49
50//_____________________________________________________________________________
51
52AliPythia* AliPythia::fgAliPythia=NULL;
53
54AliPythia::AliPythia()
55{
56// Default Constructor
57//
58// Set random number
7cdba479 59 if (!AliPythiaRndm::GetPythiaRandom())
60 AliPythiaRndm::SetPythiaRandom(GetRandom());
0f482ae4 61 fGlauber = 0;
62 fQuenchingWeights = 0;
8d2cd130 63}
64
65void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
66{
67// Initialise the process to generate
7cdba479 68 if (!AliPythiaRndm::GetPythiaRandom())
69 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 70
71 fProcess = process;
72 fEcms = energy;
73 fStrucFunc = strucfunc;
1d5b1b20 74//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
75 SetMDCY(Pycomp(111) ,1,0);
76 SetMDCY(Pycomp(310) ,1,0);
77 SetMDCY(Pycomp(3122),1,0);
78 SetMDCY(Pycomp(3112),1,0);
79 SetMDCY(Pycomp(3212),1,0);
80 SetMDCY(Pycomp(3222),1,0);
81 SetMDCY(Pycomp(3312),1,0);
82 SetMDCY(Pycomp(3322),1,0);
83 SetMDCY(Pycomp(3334),1,0);
84 // select structure function
8d2cd130 85 SetMSTP(52,2);
86 SetMSTP(51,strucfunc);
87//
88// Pythia initialisation for selected processes//
89//
90// Make MSEL clean
91//
92 for (Int_t i=1; i<= 200; i++) {
93 SetMSUB(i,0);
94 }
95// select charm production
96 switch (process)
97 {
65f2626c 98 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
99// Multiple interactions on.
100 SetMSTP(81,1);
101// Double Gaussian matter distribution.
102 SetMSTP(82,4);
103 SetPARP(83,0.5);
104 SetPARP(84,0.4);
105// pT0.
106 SetPARP(82,2.0);
107// Reference energy for pT0 and energy rescaling pace.
108 SetPARP(89,1800);
109 SetPARP(90,0.25);
110// String drawing almost completely minimizes string length.
111 SetPARP(85,0.9);
112 SetPARP(86,0.95);
113// ISR and FSR activity.
114 SetPARP(67,4);
115 SetPARP(71,4);
116// Lambda_FSR scale.
117 SetPARJ(81,0.29);
118 break;
119 case kPyOldUEQ2ordered2:
120// Old underlying events with Q2 ordered QCD processes
121// Multiple interactions on.
122 SetMSTP(81,1);
123// Double Gaussian matter distribution.
124 SetMSTP(82,4);
125 SetPARP(83,0.5);
126 SetPARP(84,0.4);
127// pT0.
128 SetPARP(82,2.0);
129// Reference energy for pT0 and energy rescaling pace.
130 SetPARP(89,1800);
131 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
132// String drawing almost completely minimizes string length.
133 SetPARP(85,0.9);
134 SetPARP(86,0.95);
135// ISR and FSR activity.
136 SetPARP(67,4);
137 SetPARP(71,4);
138// Lambda_FSR scale.
139 SetPARJ(81,0.29);
140 break;
141 case kPyOldPopcorn:
142// Old production mechanism: Old Popcorn
143 SetMSEL(1);
144 SetMSTJ(12,3);
145// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
146 SetMSTP(88,2);
147// (D=1)see can be used to form baryons (BARYON JUNCTION)
148 SetMSTJ(1,1);
149 SetMSTP(51,kCTEQ5L);// CTEQ 5L ! CTEQ5L pdf
150 SetMSTP(81,1); // Multiple Interactions ON
151 SetMSTP(82,4); // Double Gaussian Model
152 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
153 SetPARP(89,1000.); // [GeV] Ref. energy
154 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
155 SetPARP(83,0.5); // Core density in proton matter dist. (def.value)
156 SetPARP(84,0.5); // Core radius
157 SetPARP(85,0.33); // Regulates gluon prod. mechanism
158 SetPARP(86,0.66); // Regulates gluon prod. mechanism
159 SetPARP(67,1); // Regulate gluon prod. mechanism
160 break;
8d2cd130 161 case kPyCharm:
162 SetMSEL(4);
8d2cd130 163// heavy quark masses
164
165 SetPMAS(4,1,1.2);
166 SetMSTU(16,2);
167//
168// primordial pT
169 SetMSTP(91,1);
170 SetPARP(91,1.);
171 SetPARP(93,5.);
172//
173 break;
174 case kPyBeauty:
175 SetMSEL(5);
176 SetPMAS(5,1,4.75);
177 SetMSTU(16,2);
178 break;
179 case kPyJpsi:
180 SetMSEL(0);
181// gg->J/Psi g
182 SetMSUB(86,1);
183 break;
184 case kPyJpsiChi:
185 SetMSEL(0);
186// gg->J/Psi g
187 SetMSUB(86,1);
188// gg-> chi_0c g
189 SetMSUB(87,1);
190// gg-> chi_1c g
191 SetMSUB(88,1);
192// gg-> chi_2c g
193 SetMSUB(89,1);
194 break;
195 case kPyCharmUnforced:
196 SetMSEL(0);
197// gq->qg
198 SetMSUB(28,1);
199// gg->qq
200 SetMSUB(53,1);
201// gg->gg
202 SetMSUB(68,1);
203 break;
204 case kPyBeautyUnforced:
205 SetMSEL(0);
206// gq->qg
207 SetMSUB(28,1);
208// gg->qq
209 SetMSUB(53,1);
210// gg->gg
211 SetMSUB(68,1);
212 break;
213 case kPyMb:
214// Minimum Bias pp-Collisions
215//
216//
217// select Pythia min. bias model
218 SetMSEL(0);
511db649 219 SetMSUB(92,1); // single diffraction AB-->XB
220 SetMSUB(93,1); // single diffraction AB-->AX
221 SetMSUB(94,1); // double diffraction
222 SetMSUB(95,1); // low pt production
223
224//
225// ATLAS Tuning
226//
c01c4118 227
228 SetMSTP(51, kCTEQ5L); // CTEQ5L pdf
511db649 229 SetMSTP(81,1); // Multiple Interactions ON
230 SetMSTP(82,4); // Double Gaussian Model
231
232 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
233 SetPARP(89,1000.); // [GeV] Ref. energy
234 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
235 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
236 SetPARP(84,0.5); // Core radius
237 SetPARP(85,0.33); // Regulates gluon prod. mechanism
238 SetPARP(86,0.66); // Regulates gluon prod. mechanism
239 SetPARP(67,1); // Regulates Initial State Radiation
240 break;
8d2cd130 241 case kPyMbNonDiffr:
242// Minimum Bias pp-Collisions
243//
244//
245// select Pythia min. bias model
246 SetMSEL(0);
511db649 247 SetMSUB(95,1); // low pt production
0f482ae4 248
249//
250// ATLAS Tuning
251//
511db649 252
d682afd1 253 SetMSTP(51,kCTEQ5L); // CTEQ5L pdf
511db649 254 SetMSTP(81,1); // Multiple Interactions ON
255 SetMSTP(82,4); // Double Gaussian Model
256
257 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
258 SetPARP(89,1000.); // [GeV] Ref. energy
259 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
260 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
261 SetPARP(84,0.5); // Core radius
262 SetPARP(85,0.33); // Regulates gluon prod. mechanism
263 SetPARP(86,0.66); // Regulates gluon prod. mechanism
264 SetPARP(67,1); // Regulates Initial State Radiation
8d2cd130 265 break;
266 case kPyJets:
267//
268// QCD Jets
269//
270 SetMSEL(1);
65f2626c 271 // Pythia Tune A (CDF)
272 //
273 SetPARP(67,4.); // Regulates Initial State Radiation
274 SetMSTP(82,4); // Double Gaussian Model
275 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
276 SetPARP(84,0.4); // Core radius
277 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
278 SetPARP(86,0.95); // Regulates gluon prod. mechanism
279 SetPARP(89,1800.); // [GeV] Ref. energy
280 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
281 break;
8d2cd130 282 case kPyDirectGamma:
283 SetMSEL(10);
284 break;
adf4d898 285 case kPyCharmPbPbMNR:
286 case kPyD0PbPbMNR:
90d7b703 287 case kPyDPlusPbPbMNR:
288 // Tuning of Pythia parameters aimed to get a resonable agreement
289 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
290 // c-cbar single inclusive and double differential distributions.
291 // This parameter settings are meant to work with Pb-Pb collisions
292 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
293 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
294 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 295 ConfigHeavyFlavor();
90d7b703 296 // Intrinsic <kT>
297 SetMSTP(91,1);
298 SetPARP(91,1.304);
299 SetPARP(93,6.52);
90d7b703 300 // Set c-quark mass
301 SetPMAS(4,1,1.2);
8d2cd130 302 break;
adf4d898 303 case kPyCharmpPbMNR:
304 case kPyD0pPbMNR:
90d7b703 305 case kPyDPluspPbMNR:
306 // Tuning of Pythia parameters aimed to get a resonable agreement
307 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
308 // c-cbar single inclusive and double differential distributions.
309 // This parameter settings are meant to work with p-Pb collisions
310 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
311 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
312 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 313 ConfigHeavyFlavor();
90d7b703 314 // Intrinsic <kT>
3dc3ec94 315 SetMSTP(91,1);
316 SetPARP(91,1.16);
317 SetPARP(93,5.8);
318
90d7b703 319 // Set c-quark mass
3dc3ec94 320 SetPMAS(4,1,1.2);
adf4d898 321 break;
322 case kPyCharmppMNR:
323 case kPyD0ppMNR:
90d7b703 324 case kPyDPlusppMNR:
325 // Tuning of Pythia parameters aimed to get a resonable agreement
326 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
327 // c-cbar single inclusive and double differential distributions.
328 // This parameter settings are meant to work with pp collisions
329 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
330 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
331 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 332 ConfigHeavyFlavor();
90d7b703 333 // Intrinsic <kT^2>
3dc3ec94 334 SetMSTP(91,1);
335 SetPARP(91,1.);
336 SetPARP(93,5.);
337
90d7b703 338 // Set c-quark mass
3dc3ec94 339 SetPMAS(4,1,1.2);
adf4d898 340 break;
341 case kPyBeautyPbPbMNR:
8d2cd130 342 // Tuning of Pythia parameters aimed to get a resonable agreement
343 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
344 // b-bbar single inclusive and double differential distributions.
345 // This parameter settings are meant to work with Pb-Pb collisions
346 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
347 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
348 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 349 ConfigHeavyFlavor();
8d2cd130 350 // QCD scales
3dc3ec94 351 SetPARP(67,1.0);
352 SetPARP(71,1.0);
adf4d898 353 // Intrinsic <kT>
3dc3ec94 354 SetMSTP(91,1);
355 SetPARP(91,2.035);
356 SetPARP(93,10.17);
8d2cd130 357 // Set b-quark mass
3dc3ec94 358 SetPMAS(5,1,4.75);
adf4d898 359 break;
360 case kPyBeautypPbMNR:
361 // Tuning of Pythia parameters aimed to get a resonable agreement
362 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
363 // b-bbar single inclusive and double differential distributions.
364 // This parameter settings are meant to work with p-Pb collisions
365 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
366 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
367 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 368 ConfigHeavyFlavor();
adf4d898 369 // QCD scales
3dc3ec94 370 SetPARP(67,1.0);
371 SetPARP(71,1.0);
adf4d898 372 // Intrinsic <kT>
3dc3ec94 373 SetMSTP(91,1);
374 SetPARP(91,1.60);
375 SetPARP(93,8.00);
adf4d898 376 // Set b-quark mass
3dc3ec94 377 SetPMAS(5,1,4.75);
adf4d898 378 break;
379 case kPyBeautyppMNR:
380 // Tuning of Pythia parameters aimed to get a resonable agreement
381 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
382 // b-bbar single inclusive and double differential distributions.
383 // This parameter settings are meant to work with pp collisions
384 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
385 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
386 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 387 ConfigHeavyFlavor();
adf4d898 388 // QCD scales
3dc3ec94 389 SetPARP(67,1.0);
390 SetPARP(71,1.0);
391
392 // Intrinsic <kT>
393 SetMSTP(91,1);
394 SetPARP(91,1.);
395 SetPARP(93,5.);
396
397 // Set b-quark mass
398 SetPMAS(5,1,4.75);
8d2cd130 399 break;
589380c6 400
401 case kPyW:
402
403 //Inclusive production of W+/-
404 SetMSEL(0);
405 //f fbar -> W+
406 SetMSUB(2,1);
407 // //f fbar -> g W+
408 // SetMSUB(16,1);
409 // //f fbar -> gamma W+
410 // SetMSUB(20,1);
411 // //f g -> f W+
412 // SetMSUB(31,1);
413 // //f gamma -> f W+
414 // SetMSUB(36,1);
415
416 // Initial/final parton shower on (Pythia default)
417 // With parton showers on we are generating "W inclusive process"
418 SetMSTP(61,1); //Initial QCD & QED showers on
419 SetMSTP(71,1); //Final QCD & QED showers on
420
421 break;
0f6ee828 422
423 case kPyZ:
424
425 //Inclusive production of Z
426 SetMSEL(0);
427 //f fbar -> Z/gamma
428 SetMSUB(1,1);
429
430 // // f fbar -> g Z/gamma
431 // SetMSUB(15,1);
432 // // f fbar -> gamma Z/gamma
433 // SetMSUB(19,1);
434 // // f g -> f Z/gamma
435 // SetMSUB(30,1);
436 // // f gamma -> f Z/gamma
437 // SetMSUB(35,1);
438
439 //only Z included, not gamma
440 SetMSTP(43,2);
441
442 // Initial/final parton shower on (Pythia default)
443 // With parton showers on we are generating "Z inclusive process"
444 SetMSTP(61,1); //Initial QCD & QED showers on
445 SetMSTP(71,1); //Final QCD & QED showers on
446
447 break;
448
8d2cd130 449 }
450//
451// Initialize PYTHIA
452 SetMSTP(41,1); // all resonance decays switched on
453
454 Initialize("CMS","p","p",fEcms);
455
456}
457
458Int_t AliPythia::CheckedLuComp(Int_t kf)
459{
460// Check Lund particle code (for debugging)
461 Int_t kc=Pycomp(kf);
462 printf("\n Lucomp kf,kc %d %d",kf,kc);
463 return kc;
464}
465
466void AliPythia::SetNuclei(Int_t a1, Int_t a2)
467{
468// Treat protons as inside nuclei with mass numbers a1 and a2
469// The MSTP array in the PYPARS common block is used to enable and
470// select the nuclear structure functions.
471// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
472// =1: internal PYTHIA acording to MSTP(51)
473// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
474// If the following mass number both not equal zero, nuclear corrections of the stf are used.
475// MSTP(192) : Mass number of nucleus side 1
476// MSTP(193) : Mass number of nucleus side 2
477 SetMSTP(52,2);
478 SetMSTP(192, a1);
479 SetMSTP(193, a2);
480}
481
482
483AliPythia* AliPythia::Instance()
484{
485// Set random number generator
486 if (fgAliPythia) {
487 return fgAliPythia;
488 } else {
489 fgAliPythia = new AliPythia();
490 return fgAliPythia;
491 }
492}
493
494void AliPythia::PrintParticles()
495{
496// Print list of particl properties
497 Int_t np = 0;
c31f1d37 498 char* name = new char[16];
8d2cd130 499 for (Int_t kf=0; kf<1000000; kf++) {
500 for (Int_t c = 1; c > -2; c-=2) {
8d2cd130 501 Int_t kc = Pycomp(c*kf);
502 if (kc) {
503 Float_t mass = GetPMAS(kc,1);
504 Float_t width = GetPMAS(kc,2);
505 Float_t tau = GetPMAS(kc,4);
c31f1d37 506
8d2cd130 507 Pyname(kf,name);
508
509 np++;
510
511 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
512 c*kf, name, mass, width, tau);
513 }
514 }
515 }
516 printf("\n Number of particles %d \n \n", np);
517}
518
519void AliPythia::ResetDecayTable()
520{
521// Set default values for pythia decay switches
522 Int_t i;
523 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
524 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
525}
526
527void AliPythia::SetDecayTable()
528{
529// Set default values for pythia decay switches
530//
531 Int_t i;
532 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
533 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
534}
535
536void AliPythia::Pyclus(Int_t& njet)
537{
538// Call Pythia clustering algorithm
539//
540 pyclus(njet);
541}
542
543void AliPythia::Pycell(Int_t& njet)
544{
545// Call Pythia jet reconstruction algorithm
546//
547 pycell(njet);
548}
549
452af8c7 550void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
551{
552// Call Pythia jet reconstruction algorithm
553//
452af8c7 554 pyshow(ip1, ip2, qmax);
555}
556
557void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
558{
559 pyrobo(imi, ima, the, phi, bex, bey, bez);
560}
561
562
563
86b6ad68 564void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod)
0f482ae4 565{
566// Initializes
567// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
568// (2) The nuclear geometry using the Glauber Model
569//
570
571
572 fGlauber = new AliFastGlauber();
573 fGlauber->Init(2);
574 fGlauber->SetCentralityClass(cMin, cMax);
575
576 fQuenchingWeights = new AliQuenchingWeights();
577 fQuenchingWeights->InitMult();
86b6ad68 578 fQuenchingWeights->SetK(k);
0f482ae4 579 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
0f482ae4 580}
581
582
452af8c7 583void AliPythia::Quench()
584{
585//
586//
587// Simple Jet Quenching routine:
588// =============================
589// The jet formed by all final state partons radiated by the parton created
0f482ae4 590// in the hard collisions is quenched by a factor (1-z) using light cone variables in
591// the initial parton reference frame:
452af8c7 592// (E + p_z)new = (1-z) (E + p_z)old
593//
0f482ae4 594//
595//
596//
452af8c7 597// The lost momentum is first balanced by one gluon with virtuality > 0.
598// Subsequently the gluon splits to yield two gluons with E = p.
599//
0f482ae4 600//
601//
4e383037 602 static Float_t eMean = 0.;
603 static Int_t icall = 0;
0f482ae4 604
c2c598a3 605 Double_t p0[4][5];
606 Double_t p1[4][5];
607 Double_t p2[4][5];
608 Int_t klast[4] = {-1, -1, -1, -1};
452af8c7 609
610 Int_t numpart = fPyjets->N;
86b6ad68 611 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
c2c598a3 612 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
613 Bool_t quenched[4];
b280c4cc 614 Double_t wjtKick[4];
c2c598a3 615 Int_t nGluon[4];
86b6ad68 616 Int_t qPdg[4];
0f482ae4 617 Int_t imo, kst, pdg;
b280c4cc 618
511db649 619//
c2c598a3 620// Sore information about Primary partons
621//
622// j =
623// 0, 1 partons from hard scattering
624// 2, 3 partons from initial state radiation
625//
626 for (Int_t i = 2; i <= 7; i++) {
627 Int_t j = 0;
628 // Skip gluons that participate in hard scattering
629 if (i == 4 || i == 5) continue;
630 // Gluons from hard Scattering
631 if (i == 6 || i == 7) {
632 j = i - 6;
633 pxq[j] = fPyjets->P[0][i];
634 pyq[j] = fPyjets->P[1][i];
635 pzq[j] = fPyjets->P[2][i];
636 eq[j] = fPyjets->P[3][i];
637 mq[j] = fPyjets->P[4][i];
638 } else {
639 // Gluons from initial state radiation
640 //
641 // Obtain 4-momentum vector from difference between original parton and parton after gluon
642 // radiation. Energy is calculated independently because initial state radition does not
643 // conserve strictly momentum and energy for each partonic system independently.
644 //
645 // Not very clean. Should be improved !
646 //
647 //
648 j = i;
649 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
650 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
651 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
652 mq[j] = fPyjets->P[4][i];
653 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
654 }
655//
656// Calculate some kinematic variables
511db649 657//
4e383037 658 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
0f482ae4 659 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
660 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
661 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
662 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
86b6ad68 663 qPdg[j] = fPyjets->K[1][i];
664 }
665
666 Double_t int0[4];
667 Double_t int1[4];
86b6ad68 668
b280c4cc 669 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
670
86b6ad68 671 for (Int_t j = 0; j < 4; j++) {
c2c598a3 672 //
673 // Quench only central jets and with E > 10.
674 //
86b6ad68 675
676
677 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
678 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
679
c2c598a3 680 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
b280c4cc 681 fZQuench[j] = 0.;
0f482ae4 682 } else {
c2c598a3 683 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
4e383037 684 icall ++;
685 eMean += eloss;
686 }
0f482ae4 687 //
688 // Extra pt
86b6ad68 689 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
690 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
0f482ae4 691 //
692 // Fractional energy loss
b280c4cc 693 fZQuench[j] = eloss / eq[j];
0f482ae4 694 //
695 // Avoid complete loss
696 //
b280c4cc 697 if (fZQuench[j] == 1.) fZQuench[j] = 0.95;
0f482ae4 698 //
699 // Some debug printing
86b6ad68 700
701
bf9bb016 702// 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",
703// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
4e383037 704
b280c4cc 705// fZQuench[j] = 0.8;
706// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
0f482ae4 707 }
4e383037 708
b280c4cc 709 quenched[j] = (fZQuench[j] > 0.01);
4e383037 710 } // primary partons
c2c598a3 711
b280c4cc 712
713
6e90ad26 714 Double_t pNew[1000][4];
715 Int_t kNew[1000];
716 Int_t icount = 0;
b280c4cc 717 Double_t zquench[4];
718
6e90ad26 719//
4e383037 720// System Loop
c2c598a3 721 for (Int_t isys = 0; isys < 4; isys++) {
6e90ad26 722// Skip to next system if not quenched.
4e383037 723 if (!quenched[isys]) continue;
724
b280c4cc 725 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
4e383037 726 if (nGluon[isys] > 6) nGluon[isys] = 6;
b280c4cc 727 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
4e383037 728 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
0f482ae4 729
4e383037 730
731
732 Int_t igMin = -1;
733 Int_t igMax = -1;
734 Double_t pg[4] = {0., 0., 0., 0.};
735
736//
737// Loop on radiation events
738
739 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
6e90ad26 740 while (1) {
741 icount = 0;
742 for (Int_t k = 0; k < 4; k++)
743 {
744 p0[isys][k] = 0.;
745 p1[isys][k] = 0.;
746 p2[isys][k] = 0.;
747 }
748// Loop over partons
749 for (Int_t i = 0; i < numpart; i++)
750 {
751 imo = fPyjets->K[2][i];
752 kst = fPyjets->K[0][i];
753 pdg = fPyjets->K[1][i];
754
755
756
0f482ae4 757// Quarks and gluons only
6e90ad26 758 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
0f482ae4 759// Particles from hard scattering only
c2c598a3 760
6e90ad26 761 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
c2c598a3 762 Int_t imom = imo % 1000;
763 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
764 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
765
6e90ad26 766
0f482ae4 767// Skip comment lines
6e90ad26 768 if (kst != 1 && kst != 2) continue;
0f482ae4 769//
770// Parton kinematic
6e90ad26 771 px = fPyjets->P[0][i];
772 py = fPyjets->P[1][i];
773 pz = fPyjets->P[2][i];
774 e = fPyjets->P[3][i];
775 m = fPyjets->P[4][i];
776 pt = TMath::Sqrt(px * px + py * py);
777 p = TMath::Sqrt(px * px + py * py + pz * pz);
778 phi = TMath::Pi() + TMath::ATan2(-py, -px);
779 theta = TMath::ATan2(pt, pz);
780
0f482ae4 781//
c2c598a3 782// Save 4-momentum sum for balancing
783 Int_t index = isys;
6e90ad26 784
785 p0[index][0] += px;
786 p0[index][1] += py;
787 p0[index][2] += pz;
788 p0[index][3] += e;
6e90ad26 789
790 klast[index] = i;
791
0f482ae4 792//
793// Fractional energy loss
b280c4cc 794 Double_t z = zquench[index];
4e383037 795
c2c598a3 796
4e383037 797// Don't fully quench radiated gluons
798//
799 if (imo > 1000) {
800// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
801//
802
c2c598a3 803 z = 0.02;
4e383037 804 }
c2c598a3 805// printf("z: %d %f\n", imo, z);
806
4e383037 807
808//
6e90ad26 809
810 //
811 //
812 // Transform into frame in which initial parton is along z-axis
813 //
814 TVector3 v(px, py, pz);
815 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
816 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
817
818 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
819 Double_t mt2 = jt * jt + m * m;
820 Double_t zmax = 1.;
821 //
822 // Kinematic limit on z
823 //
4e383037 824 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
6e90ad26 825 //
826 // Change light-cone kinematics rel. to initial parton
827 //
828 Double_t eppzOld = e + pl;
829 Double_t empzOld = e - pl;
830
831 Double_t eppzNew = (1. - z) * eppzOld;
832 Double_t empzNew = empzOld - mt2 * z / eppzOld;
833 Double_t eNew = 0.5 * (eppzNew + empzNew);
834 Double_t plNew = 0.5 * (eppzNew - empzNew);
835
836 Double_t jtNew;
837 //
838 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
839 Double_t mt2New = eppzNew * empzNew;
840 if (mt2New < 1.e-8) mt2New = 0.;
4e383037 841 if (z < zmax) {
842 if (m * m > mt2New) {
843 //
844 // This should not happen
845 //
846 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
847 jtNew = 0;
848 } else {
849 jtNew = TMath::Sqrt(mt2New - m * m);
850 }
6e90ad26 851 } else {
4e383037 852 // If pT is to small (probably a leading massive particle) we scale only the energy
853 // This can cause negative masses of the radiated gluon
854 // Let's hope for the best ...
855 jtNew = jt;
856 eNew = TMath::Sqrt(plNew * plNew + mt2);
857
6e90ad26 858 }
6e90ad26 859 //
860 // Calculate new px, py
861 //
862 Double_t pxNew = jtNew / jt * pxs;
863 Double_t pyNew = jtNew / jt * pys;
864
865// Double_t dpx = pxs - pxNew;
866// Double_t dpy = pys - pyNew;
867// Double_t dpz = pl - plNew;
868// Double_t de = e - eNew;
869// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
870// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
871// printf("New mass (2) %e %e \n", pxNew, pyNew);
872 //
873 // Rotate back
874 //
875 TVector3 w(pxNew, pyNew, plNew);
876 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
877 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
878
879 p1[index][0] += pxNew;
880 p1[index][1] += pyNew;
881 p1[index][2] += plNew;
882 p1[index][3] += eNew;
883 //
884 // Updated 4-momentum vectors
885 //
886 pNew[icount][0] = pxNew;
887 pNew[icount][1] = pyNew;
888 pNew[icount][2] = plNew;
889 pNew[icount][3] = eNew;
890 kNew[icount] = i;
891 icount++;
892 } // parton loop
0f482ae4 893 //
6e90ad26 894 // Check if there was phase-space for quenching
0f482ae4 895 //
0f482ae4 896
6e90ad26 897 if (icount == 0) quenched[isys] = kFALSE;
898 if (!quenched[isys]) break;
899
900 for (Int_t j = 0; j < 4; j++)
901 {
902 p2[isys][j] = p0[isys][j] - p1[isys][j];
903 }
904 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];
6e90ad26 905 if (p2[isys][4] > 0.) {
906 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
907 break;
908 } else {
b280c4cc 909 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
4e383037 910 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]);
6e90ad26 911 if (p2[isys][4] < -0.01) {
4e383037 912 printf("Negative mass squared !\n");
913 // Here we have to put the gluon back to mass shell
914 // This will lead to a small energy imbalance
915 p2[isys][4] = 0.;
916 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
917 break;
6e90ad26 918 } else {
919 p2[isys][4] = 0.;
920 break;
921 }
922 }
6e90ad26 923 /*
6e90ad26 924 zHeavy *= 0.98;
925 printf("zHeavy lowered to %f\n", zHeavy);
926 if (zHeavy < 0.01) {
927 printf("No success ! \n");
928 icount = 0;
929 quenched[isys] = kFALSE;
930 break;
931 }
4e383037 932 */
933 } // iteration on z (while)
934
6e90ad26 935// Update event record
936 for (Int_t k = 0; k < icount; k++) {
937// 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] );
938 fPyjets->P[0][kNew[k]] = pNew[k][0];
939 fPyjets->P[1][kNew[k]] = pNew[k][1];
940 fPyjets->P[2][kNew[k]] = pNew[k][2];
941 fPyjets->P[3][kNew[k]] = pNew[k][3];
0f482ae4 942 }
4e383037 943 //
944 // Add the gluons
945 //
946 Int_t ish = 0;
1837e95c 947 Int_t iGlu;
4e383037 948 if (!quenched[isys]) continue;
0f482ae4 949//
950// Last parton from shower i
4e383037 951 Int_t in = klast[isys];
0f482ae4 952//
953// Continue if no parton in shower i selected
954 if (in == -1) continue;
955//
956// If this is the second initial parton and it is behind the first move pointer by previous ish
4e383037 957 if (isys == 1 && klast[1] > klast[0]) in += ish;
0f482ae4 958//
959// Starting index
452af8c7 960
4e383037 961// jmin = in - 1;
0f482ae4 962// How many additional gluons will be generated
963 ish = 1;
4e383037 964 if (p2[isys][4] > 0.05) ish = 2;
0f482ae4 965//
966// Position of gluons
4e383037 967 iGlu = numpart;
968 if (iglu == 0) igMin = iGlu;
969 igMax = iGlu;
0f482ae4 970 numpart += ish;
971 (fPyjets->N) += ish;
4e383037 972
0f482ae4 973 if (ish == 1) {
4e383037 974 fPyjets->P[0][iGlu] = p2[isys][0];
975 fPyjets->P[1][iGlu] = p2[isys][1];
976 fPyjets->P[2][iGlu] = p2[isys][2];
977 fPyjets->P[3][iGlu] = p2[isys][3];
978 fPyjets->P[4][iGlu] = p2[isys][4];
0f482ae4 979
4e383037 980 fPyjets->K[0][iGlu] = 1;
981 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
0f482ae4 982 fPyjets->K[1][iGlu] = 21;
4e383037 983 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 984 fPyjets->K[3][iGlu] = -1;
985 fPyjets->K[4][iGlu] = -1;
4e383037 986
987 pg[0] += p2[isys][0];
988 pg[1] += p2[isys][1];
989 pg[2] += p2[isys][2];
990 pg[3] += p2[isys][3];
0f482ae4 991 } else {
992 //
993 // Split gluon in rest frame.
994 //
4e383037 995 Double_t bx = p2[isys][0] / p2[isys][3];
996 Double_t by = p2[isys][1] / p2[isys][3];
997 Double_t bz = p2[isys][2] / p2[isys][3];
998 Double_t pst = p2[isys][4] / 2.;
0f482ae4 999 //
1000 // Isotropic decay ????
1001 Double_t cost = 2. * gRandom->Rndm() - 1.;
1002 Double_t sint = TMath::Sqrt(1. - cost * cost);
1003 Double_t phi = 2. * TMath::Pi() * gRandom->Rndm();
1004
1005 Double_t pz1 = pst * cost;
1006 Double_t pz2 = -pst * cost;
1007 Double_t pt1 = pst * sint;
1008 Double_t pt2 = -pst * sint;
1009 Double_t px1 = pt1 * TMath::Cos(phi);
1010 Double_t py1 = pt1 * TMath::Sin(phi);
1011 Double_t px2 = pt2 * TMath::Cos(phi);
1012 Double_t py2 = pt2 * TMath::Sin(phi);
1013
1014 fPyjets->P[0][iGlu] = px1;
1015 fPyjets->P[1][iGlu] = py1;
1016 fPyjets->P[2][iGlu] = pz1;
1017 fPyjets->P[3][iGlu] = pst;
1018 fPyjets->P[4][iGlu] = 0.;
1019
4e383037 1020 fPyjets->K[0][iGlu] = 1 ;
0f482ae4 1021 fPyjets->K[1][iGlu] = 21;
4e383037 1022 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1023 fPyjets->K[3][iGlu] = -1;
1024 fPyjets->K[4][iGlu] = -1;
1025
1026 fPyjets->P[0][iGlu+1] = px2;
1027 fPyjets->P[1][iGlu+1] = py2;
1028 fPyjets->P[2][iGlu+1] = pz2;
1029 fPyjets->P[3][iGlu+1] = pst;
1030 fPyjets->P[4][iGlu+1] = 0.;
1031
4e383037 1032 fPyjets->K[0][iGlu+1] = 1;
1033 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
0f482ae4 1034 fPyjets->K[1][iGlu+1] = 21;
4e383037 1035 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
0f482ae4 1036 fPyjets->K[3][iGlu+1] = -1;
1037 fPyjets->K[4][iGlu+1] = -1;
1038 SetMSTU(1,0);
1039 SetMSTU(2,0);
1040 //
1041 // Boost back
1042 //
1043 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1044 }
4e383037 1045/*
1046 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1047 Double_t px, py, pz;
1048 px = fPyjets->P[0][ig];
1049 py = fPyjets->P[1][ig];
1050 pz = fPyjets->P[2][ig];
1051 TVector3 v(px, py, pz);
1052 v.RotateZ(-phiq[isys]);
1053 v.RotateY(-thetaq[isys]);
1054 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1055 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1056 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1057 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1058 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1059 pxs += jtKick * TMath::Cos(phiKick);
1060 pys += jtKick * TMath::Sin(phiKick);
1061 TVector3 w(pxs, pys, pzs);
1062 w.RotateY(thetaq[isys]);
1063 w.RotateZ(phiq[isys]);
1064 fPyjets->P[0][ig] = w.X();
1065 fPyjets->P[1][ig] = w.Y();
1066 fPyjets->P[2][ig] = w.Z();
1067 fPyjets->P[2][ig] = w.Mag();
1068 }
1069*/
1070 } // kGluon
1071
6e90ad26 1072
4e383037 1073 // Check energy conservation
0f482ae4 1074 Double_t pxs = 0.;
1075 Double_t pys = 0.;
1076 Double_t pzs = 0.;
1077 Double_t es = 14000.;
1078
1079 for (Int_t i = 0; i < numpart; i++)
1080 {
1081 kst = fPyjets->K[0][i];
1082 if (kst != 1 && kst != 2) continue;
1083 pxs += fPyjets->P[0][i];
1084 pys += fPyjets->P[1][i];
1085 pzs += fPyjets->P[2][i];
1086 es -= fPyjets->P[3][i];
1087 }
1088 if (TMath::Abs(pxs) > 1.e-2 ||
1089 TMath::Abs(pys) > 1.e-2 ||
1090 TMath::Abs(pzs) > 1.e-1) {
1091 printf("%e %e %e %e\n", pxs, pys, pzs, es);
4e383037 1092// Fatal("Quench()", "4-Momentum non-conservation");
452af8c7 1093 }
4e383037 1094
1095 } // end quenching loop (systems)
6e90ad26 1096// Clean-up
0f482ae4 1097 for (Int_t i = 0; i < numpart; i++)
1098 {
4e383037 1099 imo = fPyjets->K[2][i];
1100 if (imo > 1000) {
1101 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1102 }
0f482ae4 1103 }
4e383037 1104// this->Pylist(1);
0f482ae4 1105} // end quench
90d7b703 1106
992f2843 1107
1108void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1109{
1110 // Igor Lokthine's quenching routine
1111 pyquen(a, ibf, b);
1112}
b280c4cc 1113
16a82508 1114void AliPythia::Pyevnw()
1115{
1116 // New multiple interaction scenario
1117 pyevnw();
1118}
1119
b280c4cc 1120void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1121{
1122 // Return event specific quenching parameters
1123 xp = fXJet;
1124 yp = fYJet;
1125 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1126
1127}
1128
3dc3ec94 1129void AliPythia::ConfigHeavyFlavor()
1130{
1131 //
1132 // Default configuration for Heavy Flavor production
1133 //
1134 // All QCD processes
1135 //
1136 SetMSEL(1);
1137
1138 // No multiple interactions
1139 SetMSTP(81,0);
1140 SetPARP(81,0.0);
1141 SetPARP(82,0.0);
1142
1143 // Initial/final parton shower on (Pythia default)
1144 SetMSTP(61,1);
1145 SetMSTP(71,1);
1146
1147 // 2nd order alpha_s
1148 SetMSTP(2,2);
1149
1150 // QCD scales
1151 SetMSTP(32,2);
1152 SetPARP(34,1.0);
1153}