Initialize fGinit and fGfinal.
[u/mrichter/AliRoot.git] / PYTHIA6 / AliPythia.cxx
CommitLineData
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);
0c0f2010 87
8d2cd130 88//
89// Pythia initialisation for selected processes//
90//
91// Make MSEL clean
92//
93 for (Int_t i=1; i<= 200; i++) {
94 SetMSUB(i,0);
95 }
96// select charm production
97 switch (process)
98 {
65f2626c 99 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
100// Multiple interactions on.
101 SetMSTP(81,1);
102// Double Gaussian matter distribution.
103 SetMSTP(82,4);
104 SetPARP(83,0.5);
105 SetPARP(84,0.4);
106// pT0.
107 SetPARP(82,2.0);
108// Reference energy for pT0 and energy rescaling pace.
109 SetPARP(89,1800);
110 SetPARP(90,0.25);
111// String drawing almost completely minimizes string length.
112 SetPARP(85,0.9);
113 SetPARP(86,0.95);
114// ISR and FSR activity.
115 SetPARP(67,4);
116 SetPARP(71,4);
117// Lambda_FSR scale.
118 SetPARJ(81,0.29);
119 break;
120 case kPyOldUEQ2ordered2:
121// Old underlying events with Q2 ordered QCD processes
122// Multiple interactions on.
123 SetMSTP(81,1);
124// Double Gaussian matter distribution.
125 SetMSTP(82,4);
126 SetPARP(83,0.5);
127 SetPARP(84,0.4);
128// pT0.
129 SetPARP(82,2.0);
130// Reference energy for pT0 and energy rescaling pace.
131 SetPARP(89,1800);
132 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
133// String drawing almost completely minimizes string length.
134 SetPARP(85,0.9);
135 SetPARP(86,0.95);
136// ISR and FSR activity.
137 SetPARP(67,4);
138 SetPARP(71,4);
139// Lambda_FSR scale.
140 SetPARJ(81,0.29);
141 break;
142 case kPyOldPopcorn:
143// Old production mechanism: Old Popcorn
144 SetMSEL(1);
145 SetMSTJ(12,3);
146// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
147 SetMSTP(88,2);
148// (D=1)see can be used to form baryons (BARYON JUNCTION)
149 SetMSTJ(1,1);
e0e89f40 150 AtlasTuning();
65f2626c 151 break;
8d2cd130 152 case kPyCharm:
153 SetMSEL(4);
8d2cd130 154// heavy quark masses
155
156 SetPMAS(4,1,1.2);
157 SetMSTU(16,2);
158//
159// primordial pT
160 SetMSTP(91,1);
161 SetPARP(91,1.);
162 SetPARP(93,5.);
163//
164 break;
165 case kPyBeauty:
166 SetMSEL(5);
167 SetPMAS(5,1,4.75);
168 SetMSTU(16,2);
169 break;
170 case kPyJpsi:
171 SetMSEL(0);
172// gg->J/Psi g
173 SetMSUB(86,1);
174 break;
175 case kPyJpsiChi:
176 SetMSEL(0);
177// gg->J/Psi g
178 SetMSUB(86,1);
179// gg-> chi_0c g
180 SetMSUB(87,1);
181// gg-> chi_1c g
182 SetMSUB(88,1);
183// gg-> chi_2c g
184 SetMSUB(89,1);
185 break;
186 case kPyCharmUnforced:
187 SetMSEL(0);
0c0f2010 188 SetMSTU(16,2);
8d2cd130 189// gq->qg
190 SetMSUB(28,1);
191// gg->qq
192 SetMSUB(53,1);
193// gg->gg
194 SetMSUB(68,1);
195 break;
196 case kPyBeautyUnforced:
0c0f2010 197 SetMSTU(16,2);
8d2cd130 198 SetMSEL(0);
199// gq->qg
200 SetMSUB(28,1);
201// gg->qq
202 SetMSUB(53,1);
203// gg->gg
204 SetMSUB(68,1);
205 break;
206 case kPyMb:
207// Minimum Bias pp-Collisions
208//
209//
210// select Pythia min. bias model
211 SetMSEL(0);
511db649 212 SetMSUB(92,1); // single diffraction AB-->XB
213 SetMSUB(93,1); // single diffraction AB-->AX
214 SetMSUB(94,1); // double diffraction
215 SetMSUB(95,1); // low pt production
216
e0e89f40 217 AtlasTuning();
511db649 218 break;
8d2cd130 219 case kPyMbNonDiffr:
220// Minimum Bias pp-Collisions
221//
222//
223// select Pythia min. bias model
224 SetMSEL(0);
511db649 225 SetMSUB(95,1); // low pt production
0f482ae4 226
e0e89f40 227 AtlasTuning();
8d2cd130 228 break;
d7de4a67 229 case kPyMbMSEL1:
230 ConfigHeavyFlavor();
231// Intrinsic <kT^2>
232 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
233 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
234 SetPARP(93,5.); // Upper cut-off
235// Set Q-quark mass
236 SetPMAS(4,1,1.2); // Charm quark mass
237 SetPMAS(5,1,4.78); // Beauty quark mass
238 SetPARP(71,4.); // Defaut value
239// Atlas Tuning
240 AtlasTuning();
241 break;
8d2cd130 242 case kPyJets:
243//
244// QCD Jets
245//
246 SetMSEL(1);
65f2626c 247 // Pythia Tune A (CDF)
248 //
249 SetPARP(67,4.); // Regulates Initial State Radiation
250 SetMSTP(82,4); // Double Gaussian Model
251 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
252 SetPARP(84,0.4); // Core radius
253 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
254 SetPARP(86,0.95); // Regulates gluon prod. mechanism
255 SetPARP(89,1800.); // [GeV] Ref. energy
256 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
257 break;
8d2cd130 258 case kPyDirectGamma:
259 SetMSEL(10);
260 break;
adf4d898 261 case kPyCharmPbPbMNR:
262 case kPyD0PbPbMNR:
90d7b703 263 case kPyDPlusPbPbMNR:
e0e89f40 264 case kPyDPlusStrangePbPbMNR:
90d7b703 265 // Tuning of Pythia parameters aimed to get a resonable agreement
266 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
267 // c-cbar single inclusive and double differential distributions.
268 // This parameter settings are meant to work with Pb-Pb collisions
269 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
270 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
271 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 272 ConfigHeavyFlavor();
90d7b703 273 // Intrinsic <kT>
274 SetMSTP(91,1);
275 SetPARP(91,1.304);
276 SetPARP(93,6.52);
90d7b703 277 // Set c-quark mass
278 SetPMAS(4,1,1.2);
90d7b703 279 break;
adf4d898 280 case kPyCharmpPbMNR:
281 case kPyD0pPbMNR:
90d7b703 282 case kPyDPluspPbMNR:
e0e89f40 283 case kPyDPlusStrangepPbMNR:
90d7b703 284 // Tuning of Pythia parameters aimed to get a resonable agreement
285 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
286 // c-cbar single inclusive and double differential distributions.
287 // This parameter settings are meant to work with p-Pb collisions
288 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
289 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
290 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 291 ConfigHeavyFlavor();
90d7b703 292 // Intrinsic <kT>
3dc3ec94 293 SetMSTP(91,1);
294 SetPARP(91,1.16);
295 SetPARP(93,5.8);
296
90d7b703 297 // Set c-quark mass
3dc3ec94 298 SetPMAS(4,1,1.2);
90d7b703 299 break;
adf4d898 300 case kPyCharmppMNR:
301 case kPyD0ppMNR:
90d7b703 302 case kPyDPlusppMNR:
e0e89f40 303 case kPyDPlusStrangeppMNR:
90d7b703 304 // Tuning of Pythia parameters aimed to get a resonable agreement
305 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
306 // c-cbar single inclusive and double differential distributions.
307 // This parameter settings are meant to work with pp collisions
308 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
309 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
310 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 311 ConfigHeavyFlavor();
90d7b703 312 // Intrinsic <kT^2>
3dc3ec94 313 SetMSTP(91,1);
314 SetPARP(91,1.);
315 SetPARP(93,5.);
316
90d7b703 317 // Set c-quark mass
3dc3ec94 318 SetPMAS(4,1,1.2);
90d7b703 319 break;
e0e89f40 320 case kPyCharmppMNRwmi:
321 // Tuning of Pythia parameters aimed to get a resonable agreement
322 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
323 // c-cbar single inclusive and double differential distributions.
324 // This parameter settings are meant to work with pp collisions
325 // and with kCTEQ5L PDFs.
326 // Added multiple interactions according to ATLAS tune settings.
327 // To get a "reasonable" agreement with MNR results, events have to be
328 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
329 // set to 2.76 GeV.
330 // To get a "perfect" agreement with MNR results, events have to be
331 // generated in four ptHard bins with the following relative
332 // normalizations:
333 // 2.76-3 GeV: 25%
334 // 3-4 GeV: 40%
335 // 4-8 GeV: 29%
336 // >8 GeV: 6%
337 ConfigHeavyFlavor();
338 // Intrinsic <kT^2>
339 SetMSTP(91,1);
340 SetPARP(91,1.);
341 SetPARP(93,5.);
342
343 // Set c-quark mass
344 SetPMAS(4,1,1.2);
345 AtlasTuning();
346 break;
adf4d898 347 case kPyBeautyPbPbMNR:
8d2cd130 348 // Tuning of Pythia parameters aimed to get a resonable agreement
349 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
350 // b-bbar single inclusive and double differential distributions.
351 // This parameter settings are meant to work with Pb-Pb collisions
352 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
353 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
354 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 355 ConfigHeavyFlavor();
8d2cd130 356 // QCD scales
3dc3ec94 357 SetPARP(67,1.0);
358 SetPARP(71,1.0);
adf4d898 359 // Intrinsic <kT>
3dc3ec94 360 SetMSTP(91,1);
361 SetPARP(91,2.035);
362 SetPARP(93,10.17);
8d2cd130 363 // Set b-quark mass
3dc3ec94 364 SetPMAS(5,1,4.75);
8d2cd130 365 break;
adf4d898 366 case kPyBeautypPbMNR:
367 // Tuning of Pythia parameters aimed to get a resonable agreement
368 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
369 // b-bbar single inclusive and double differential distributions.
370 // This parameter settings are meant to work with p-Pb collisions
371 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
372 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
373 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 374 ConfigHeavyFlavor();
adf4d898 375 // QCD scales
3dc3ec94 376 SetPARP(67,1.0);
377 SetPARP(71,1.0);
adf4d898 378 // Intrinsic <kT>
3dc3ec94 379 SetMSTP(91,1);
380 SetPARP(91,1.60);
381 SetPARP(93,8.00);
adf4d898 382 // Set b-quark mass
3dc3ec94 383 SetPMAS(5,1,4.75);
adf4d898 384 break;
385 case kPyBeautyppMNR:
386 // Tuning of Pythia parameters aimed to get a resonable agreement
387 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
388 // b-bbar single inclusive and double differential distributions.
389 // This parameter settings are meant to work with pp collisions
390 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
391 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
392 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 393 ConfigHeavyFlavor();
adf4d898 394 // QCD scales
3dc3ec94 395 SetPARP(67,1.0);
396 SetPARP(71,1.0);
397
398 // Intrinsic <kT>
399 SetMSTP(91,1);
400 SetPARP(91,1.);
401 SetPARP(93,5.);
402
403 // Set b-quark mass
404 SetPMAS(5,1,4.75);
adf4d898 405 break;
e0e89f40 406 case kPyBeautyppMNRwmi:
407 // Tuning of Pythia parameters aimed to get a resonable agreement
408 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
409 // b-bbar single inclusive and double differential distributions.
410 // This parameter settings are meant to work with pp collisions
411 // and with kCTEQ5L PDFs.
412 // Added multiple interactions according to ATLAS tune settings.
413 // To get a "reasonable" agreement with MNR results, events have to be
414 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
415 // set to 2.76 GeV.
416 // To get a "perfect" agreement with MNR results, events have to be
417 // generated in four ptHard bins with the following relative
418 // normalizations:
419 // 2.76-4 GeV: 5%
420 // 4-6 GeV: 31%
421 // 6-8 GeV: 28%
422 // >8 GeV: 36%
423 ConfigHeavyFlavor();
424 // QCD scales
425 SetPARP(67,1.0);
426 SetPARP(71,1.0);
427
428 // Intrinsic <kT>
429 SetMSTP(91,1);
430 SetPARP(91,1.);
431 SetPARP(93,5.);
432
433 // Set b-quark mass
434 SetPMAS(5,1,4.75);
435
436 AtlasTuning();
437 break;
589380c6 438 case kPyW:
439
440 //Inclusive production of W+/-
441 SetMSEL(0);
442 //f fbar -> W+
443 SetMSUB(2,1);
444 // //f fbar -> g W+
445 // SetMSUB(16,1);
446 // //f fbar -> gamma W+
447 // SetMSUB(20,1);
448 // //f g -> f W+
449 // SetMSUB(31,1);
450 // //f gamma -> f W+
451 // SetMSUB(36,1);
452
453 // Initial/final parton shower on (Pythia default)
454 // With parton showers on we are generating "W inclusive process"
455 SetMSTP(61,1); //Initial QCD & QED showers on
456 SetMSTP(71,1); //Final QCD & QED showers on
457
458 break;
0f6ee828 459
460 case kPyZ:
461
462 //Inclusive production of Z
463 SetMSEL(0);
464 //f fbar -> Z/gamma
465 SetMSUB(1,1);
466
467 // // f fbar -> g Z/gamma
468 // SetMSUB(15,1);
469 // // f fbar -> gamma Z/gamma
470 // SetMSUB(19,1);
471 // // f g -> f Z/gamma
472 // SetMSUB(30,1);
473 // // f gamma -> f Z/gamma
474 // SetMSUB(35,1);
475
476 //only Z included, not gamma
477 SetMSTP(43,2);
478
479 // Initial/final parton shower on (Pythia default)
480 // With parton showers on we are generating "Z inclusive process"
481 SetMSTP(61,1); //Initial QCD & QED showers on
482 SetMSTP(71,1); //Final QCD & QED showers on
483
484 break;
485
8d2cd130 486 }
487//
488// Initialize PYTHIA
489 SetMSTP(41,1); // all resonance decays switched on
490
491 Initialize("CMS","p","p",fEcms);
492
493}
494
495Int_t AliPythia::CheckedLuComp(Int_t kf)
496{
497// Check Lund particle code (for debugging)
498 Int_t kc=Pycomp(kf);
499 printf("\n Lucomp kf,kc %d %d",kf,kc);
500 return kc;
501}
502
503void AliPythia::SetNuclei(Int_t a1, Int_t a2)
504{
505// Treat protons as inside nuclei with mass numbers a1 and a2
506// The MSTP array in the PYPARS common block is used to enable and
507// select the nuclear structure functions.
508// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
509// =1: internal PYTHIA acording to MSTP(51)
510// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
511// If the following mass number both not equal zero, nuclear corrections of the stf are used.
512// MSTP(192) : Mass number of nucleus side 1
513// MSTP(193) : Mass number of nucleus side 2
514 SetMSTP(52,2);
515 SetMSTP(192, a1);
516 SetMSTP(193, a2);
517}
518
519
520AliPythia* AliPythia::Instance()
521{
522// Set random number generator
523 if (fgAliPythia) {
524 return fgAliPythia;
525 } else {
526 fgAliPythia = new AliPythia();
527 return fgAliPythia;
528 }
529}
530
531void AliPythia::PrintParticles()
532{
533// Print list of particl properties
534 Int_t np = 0;
c31f1d37 535 char* name = new char[16];
8d2cd130 536 for (Int_t kf=0; kf<1000000; kf++) {
537 for (Int_t c = 1; c > -2; c-=2) {
8d2cd130 538 Int_t kc = Pycomp(c*kf);
539 if (kc) {
540 Float_t mass = GetPMAS(kc,1);
541 Float_t width = GetPMAS(kc,2);
542 Float_t tau = GetPMAS(kc,4);
c31f1d37 543
8d2cd130 544 Pyname(kf,name);
545
546 np++;
547
548 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
549 c*kf, name, mass, width, tau);
550 }
551 }
552 }
553 printf("\n Number of particles %d \n \n", np);
554}
555
556void AliPythia::ResetDecayTable()
557{
558// Set default values for pythia decay switches
559 Int_t i;
560 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
561 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
562}
563
564void AliPythia::SetDecayTable()
565{
566// Set default values for pythia decay switches
567//
568 Int_t i;
569 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
570 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
571}
572
573void AliPythia::Pyclus(Int_t& njet)
574{
575// Call Pythia clustering algorithm
576//
577 pyclus(njet);
578}
579
580void AliPythia::Pycell(Int_t& njet)
581{
582// Call Pythia jet reconstruction algorithm
583//
584 pycell(njet);
585}
586
452af8c7 587void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
588{
589// Call Pythia jet reconstruction algorithm
590//
452af8c7 591 pyshow(ip1, ip2, qmax);
592}
593
594void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
595{
596 pyrobo(imi, ima, the, phi, bex, bey, bez);
597}
598
599
600
86b6ad68 601void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod)
0f482ae4 602{
603// Initializes
604// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
605// (2) The nuclear geometry using the Glauber Model
606//
607
608
609 fGlauber = new AliFastGlauber();
610 fGlauber->Init(2);
611 fGlauber->SetCentralityClass(cMin, cMax);
612
613 fQuenchingWeights = new AliQuenchingWeights();
614 fQuenchingWeights->InitMult();
86b6ad68 615 fQuenchingWeights->SetK(k);
0f482ae4 616 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
0f482ae4 617}
618
619
452af8c7 620void AliPythia::Quench()
621{
622//
623//
624// Simple Jet Quenching routine:
625// =============================
626// The jet formed by all final state partons radiated by the parton created
0f482ae4 627// in the hard collisions is quenched by a factor (1-z) using light cone variables in
628// the initial parton reference frame:
452af8c7 629// (E + p_z)new = (1-z) (E + p_z)old
630//
0f482ae4 631//
632//
633//
452af8c7 634// The lost momentum is first balanced by one gluon with virtuality > 0.
635// Subsequently the gluon splits to yield two gluons with E = p.
636//
0f482ae4 637//
638//
4e383037 639 static Float_t eMean = 0.;
640 static Int_t icall = 0;
0f482ae4 641
c2c598a3 642 Double_t p0[4][5];
643 Double_t p1[4][5];
644 Double_t p2[4][5];
645 Int_t klast[4] = {-1, -1, -1, -1};
452af8c7 646
647 Int_t numpart = fPyjets->N;
86b6ad68 648 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
c2c598a3 649 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
650 Bool_t quenched[4];
b280c4cc 651 Double_t wjtKick[4];
c2c598a3 652 Int_t nGluon[4];
86b6ad68 653 Int_t qPdg[4];
0f482ae4 654 Int_t imo, kst, pdg;
b280c4cc 655
511db649 656//
c2c598a3 657// Sore information about Primary partons
658//
659// j =
660// 0, 1 partons from hard scattering
661// 2, 3 partons from initial state radiation
662//
663 for (Int_t i = 2; i <= 7; i++) {
664 Int_t j = 0;
665 // Skip gluons that participate in hard scattering
666 if (i == 4 || i == 5) continue;
667 // Gluons from hard Scattering
668 if (i == 6 || i == 7) {
669 j = i - 6;
670 pxq[j] = fPyjets->P[0][i];
671 pyq[j] = fPyjets->P[1][i];
672 pzq[j] = fPyjets->P[2][i];
673 eq[j] = fPyjets->P[3][i];
674 mq[j] = fPyjets->P[4][i];
675 } else {
676 // Gluons from initial state radiation
677 //
678 // Obtain 4-momentum vector from difference between original parton and parton after gluon
679 // radiation. Energy is calculated independently because initial state radition does not
680 // conserve strictly momentum and energy for each partonic system independently.
681 //
682 // Not very clean. Should be improved !
683 //
684 //
685 j = i;
686 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
687 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
688 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
689 mq[j] = fPyjets->P[4][i];
690 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
691 }
692//
693// Calculate some kinematic variables
511db649 694//
4e383037 695 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
0f482ae4 696 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
697 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
698 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
699 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
86b6ad68 700 qPdg[j] = fPyjets->K[1][i];
701 }
702
703 Double_t int0[4];
704 Double_t int1[4];
86b6ad68 705
b280c4cc 706 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
707
86b6ad68 708 for (Int_t j = 0; j < 4; j++) {
c2c598a3 709 //
710 // Quench only central jets and with E > 10.
711 //
86b6ad68 712
713
714 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
715 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
716
c2c598a3 717 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
b280c4cc 718 fZQuench[j] = 0.;
0f482ae4 719 } else {
c2c598a3 720 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
4e383037 721 icall ++;
722 eMean += eloss;
723 }
0f482ae4 724 //
725 // Extra pt
86b6ad68 726 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
727 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
0f482ae4 728 //
729 // Fractional energy loss
b280c4cc 730 fZQuench[j] = eloss / eq[j];
0f482ae4 731 //
732 // Avoid complete loss
733 //
b280c4cc 734 if (fZQuench[j] == 1.) fZQuench[j] = 0.95;
0f482ae4 735 //
736 // Some debug printing
86b6ad68 737
738
bf9bb016 739// 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",
740// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
4e383037 741
b280c4cc 742// fZQuench[j] = 0.8;
743// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
0f482ae4 744 }
4e383037 745
b280c4cc 746 quenched[j] = (fZQuench[j] > 0.01);
4e383037 747 } // primary partons
c2c598a3 748
b280c4cc 749
750
6e90ad26 751 Double_t pNew[1000][4];
752 Int_t kNew[1000];
753 Int_t icount = 0;
b280c4cc 754 Double_t zquench[4];
755
6e90ad26 756//
4e383037 757// System Loop
c2c598a3 758 for (Int_t isys = 0; isys < 4; isys++) {
6e90ad26 759// Skip to next system if not quenched.
4e383037 760 if (!quenched[isys]) continue;
761
b280c4cc 762 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
4e383037 763 if (nGluon[isys] > 6) nGluon[isys] = 6;
b280c4cc 764 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
4e383037 765 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
0f482ae4 766
4e383037 767
768
769 Int_t igMin = -1;
770 Int_t igMax = -1;
771 Double_t pg[4] = {0., 0., 0., 0.};
772
773//
774// Loop on radiation events
775
776 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
6e90ad26 777 while (1) {
778 icount = 0;
779 for (Int_t k = 0; k < 4; k++)
780 {
781 p0[isys][k] = 0.;
782 p1[isys][k] = 0.;
783 p2[isys][k] = 0.;
784 }
785// Loop over partons
786 for (Int_t i = 0; i < numpart; i++)
787 {
788 imo = fPyjets->K[2][i];
789 kst = fPyjets->K[0][i];
790 pdg = fPyjets->K[1][i];
791
792
793
0f482ae4 794// Quarks and gluons only
6e90ad26 795 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
0f482ae4 796// Particles from hard scattering only
c2c598a3 797
6e90ad26 798 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
c2c598a3 799 Int_t imom = imo % 1000;
800 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
801 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
802
6e90ad26 803
0f482ae4 804// Skip comment lines
6e90ad26 805 if (kst != 1 && kst != 2) continue;
0f482ae4 806//
807// Parton kinematic
6e90ad26 808 px = fPyjets->P[0][i];
809 py = fPyjets->P[1][i];
810 pz = fPyjets->P[2][i];
811 e = fPyjets->P[3][i];
812 m = fPyjets->P[4][i];
813 pt = TMath::Sqrt(px * px + py * py);
814 p = TMath::Sqrt(px * px + py * py + pz * pz);
815 phi = TMath::Pi() + TMath::ATan2(-py, -px);
816 theta = TMath::ATan2(pt, pz);
817
0f482ae4 818//
c2c598a3 819// Save 4-momentum sum for balancing
820 Int_t index = isys;
6e90ad26 821
822 p0[index][0] += px;
823 p0[index][1] += py;
824 p0[index][2] += pz;
825 p0[index][3] += e;
6e90ad26 826
827 klast[index] = i;
828
0f482ae4 829//
830// Fractional energy loss
b280c4cc 831 Double_t z = zquench[index];
4e383037 832
c2c598a3 833
4e383037 834// Don't fully quench radiated gluons
835//
836 if (imo > 1000) {
837// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
838//
839
c2c598a3 840 z = 0.02;
4e383037 841 }
c2c598a3 842// printf("z: %d %f\n", imo, z);
843
4e383037 844
845//
6e90ad26 846
847 //
848 //
849 // Transform into frame in which initial parton is along z-axis
850 //
851 TVector3 v(px, py, pz);
852 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
853 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
854
855 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
856 Double_t mt2 = jt * jt + m * m;
857 Double_t zmax = 1.;
858 //
859 // Kinematic limit on z
860 //
4e383037 861 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
6e90ad26 862 //
863 // Change light-cone kinematics rel. to initial parton
864 //
865 Double_t eppzOld = e + pl;
866 Double_t empzOld = e - pl;
867
868 Double_t eppzNew = (1. - z) * eppzOld;
869 Double_t empzNew = empzOld - mt2 * z / eppzOld;
870 Double_t eNew = 0.5 * (eppzNew + empzNew);
871 Double_t plNew = 0.5 * (eppzNew - empzNew);
872
873 Double_t jtNew;
874 //
875 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
876 Double_t mt2New = eppzNew * empzNew;
877 if (mt2New < 1.e-8) mt2New = 0.;
4e383037 878 if (z < zmax) {
879 if (m * m > mt2New) {
880 //
881 // This should not happen
882 //
883 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
884 jtNew = 0;
885 } else {
886 jtNew = TMath::Sqrt(mt2New - m * m);
887 }
6e90ad26 888 } else {
4e383037 889 // If pT is to small (probably a leading massive particle) we scale only the energy
890 // This can cause negative masses of the radiated gluon
891 // Let's hope for the best ...
892 jtNew = jt;
893 eNew = TMath::Sqrt(plNew * plNew + mt2);
894
6e90ad26 895 }
6e90ad26 896 //
897 // Calculate new px, py
898 //
899 Double_t pxNew = jtNew / jt * pxs;
900 Double_t pyNew = jtNew / jt * pys;
901
902// Double_t dpx = pxs - pxNew;
903// Double_t dpy = pys - pyNew;
904// Double_t dpz = pl - plNew;
905// Double_t de = e - eNew;
906// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
907// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
908// printf("New mass (2) %e %e \n", pxNew, pyNew);
909 //
910 // Rotate back
911 //
912 TVector3 w(pxNew, pyNew, plNew);
913 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
914 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
915
916 p1[index][0] += pxNew;
917 p1[index][1] += pyNew;
918 p1[index][2] += plNew;
919 p1[index][3] += eNew;
920 //
921 // Updated 4-momentum vectors
922 //
923 pNew[icount][0] = pxNew;
924 pNew[icount][1] = pyNew;
925 pNew[icount][2] = plNew;
926 pNew[icount][3] = eNew;
927 kNew[icount] = i;
928 icount++;
929 } // parton loop
0f482ae4 930 //
6e90ad26 931 // Check if there was phase-space for quenching
0f482ae4 932 //
0f482ae4 933
6e90ad26 934 if (icount == 0) quenched[isys] = kFALSE;
935 if (!quenched[isys]) break;
936
937 for (Int_t j = 0; j < 4; j++)
938 {
939 p2[isys][j] = p0[isys][j] - p1[isys][j];
940 }
941 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 942 if (p2[isys][4] > 0.) {
943 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
944 break;
945 } else {
b280c4cc 946 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
4e383037 947 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 948 if (p2[isys][4] < -0.01) {
4e383037 949 printf("Negative mass squared !\n");
950 // Here we have to put the gluon back to mass shell
951 // This will lead to a small energy imbalance
952 p2[isys][4] = 0.;
953 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
954 break;
6e90ad26 955 } else {
956 p2[isys][4] = 0.;
957 break;
958 }
959 }
6e90ad26 960 /*
6e90ad26 961 zHeavy *= 0.98;
962 printf("zHeavy lowered to %f\n", zHeavy);
963 if (zHeavy < 0.01) {
964 printf("No success ! \n");
965 icount = 0;
966 quenched[isys] = kFALSE;
967 break;
968 }
4e383037 969 */
970 } // iteration on z (while)
971
6e90ad26 972// Update event record
973 for (Int_t k = 0; k < icount; k++) {
974// 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] );
975 fPyjets->P[0][kNew[k]] = pNew[k][0];
976 fPyjets->P[1][kNew[k]] = pNew[k][1];
977 fPyjets->P[2][kNew[k]] = pNew[k][2];
978 fPyjets->P[3][kNew[k]] = pNew[k][3];
0f482ae4 979 }
4e383037 980 //
981 // Add the gluons
982 //
983 Int_t ish = 0;
1837e95c 984 Int_t iGlu;
4e383037 985 if (!quenched[isys]) continue;
0f482ae4 986//
987// Last parton from shower i
4e383037 988 Int_t in = klast[isys];
0f482ae4 989//
990// Continue if no parton in shower i selected
991 if (in == -1) continue;
992//
993// If this is the second initial parton and it is behind the first move pointer by previous ish
4e383037 994 if (isys == 1 && klast[1] > klast[0]) in += ish;
0f482ae4 995//
996// Starting index
452af8c7 997
4e383037 998// jmin = in - 1;
0f482ae4 999// How many additional gluons will be generated
1000 ish = 1;
4e383037 1001 if (p2[isys][4] > 0.05) ish = 2;
0f482ae4 1002//
1003// Position of gluons
4e383037 1004 iGlu = numpart;
1005 if (iglu == 0) igMin = iGlu;
1006 igMax = iGlu;
0f482ae4 1007 numpart += ish;
1008 (fPyjets->N) += ish;
4e383037 1009
0f482ae4 1010 if (ish == 1) {
4e383037 1011 fPyjets->P[0][iGlu] = p2[isys][0];
1012 fPyjets->P[1][iGlu] = p2[isys][1];
1013 fPyjets->P[2][iGlu] = p2[isys][2];
1014 fPyjets->P[3][iGlu] = p2[isys][3];
1015 fPyjets->P[4][iGlu] = p2[isys][4];
0f482ae4 1016
4e383037 1017 fPyjets->K[0][iGlu] = 1;
1018 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
0f482ae4 1019 fPyjets->K[1][iGlu] = 21;
4e383037 1020 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1021 fPyjets->K[3][iGlu] = -1;
1022 fPyjets->K[4][iGlu] = -1;
4e383037 1023
1024 pg[0] += p2[isys][0];
1025 pg[1] += p2[isys][1];
1026 pg[2] += p2[isys][2];
1027 pg[3] += p2[isys][3];
0f482ae4 1028 } else {
1029 //
1030 // Split gluon in rest frame.
1031 //
4e383037 1032 Double_t bx = p2[isys][0] / p2[isys][3];
1033 Double_t by = p2[isys][1] / p2[isys][3];
1034 Double_t bz = p2[isys][2] / p2[isys][3];
1035 Double_t pst = p2[isys][4] / 2.;
0f482ae4 1036 //
1037 // Isotropic decay ????
1038 Double_t cost = 2. * gRandom->Rndm() - 1.;
1039 Double_t sint = TMath::Sqrt(1. - cost * cost);
1040 Double_t phi = 2. * TMath::Pi() * gRandom->Rndm();
1041
1042 Double_t pz1 = pst * cost;
1043 Double_t pz2 = -pst * cost;
1044 Double_t pt1 = pst * sint;
1045 Double_t pt2 = -pst * sint;
1046 Double_t px1 = pt1 * TMath::Cos(phi);
1047 Double_t py1 = pt1 * TMath::Sin(phi);
1048 Double_t px2 = pt2 * TMath::Cos(phi);
1049 Double_t py2 = pt2 * TMath::Sin(phi);
1050
1051 fPyjets->P[0][iGlu] = px1;
1052 fPyjets->P[1][iGlu] = py1;
1053 fPyjets->P[2][iGlu] = pz1;
1054 fPyjets->P[3][iGlu] = pst;
1055 fPyjets->P[4][iGlu] = 0.;
1056
4e383037 1057 fPyjets->K[0][iGlu] = 1 ;
0f482ae4 1058 fPyjets->K[1][iGlu] = 21;
4e383037 1059 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1060 fPyjets->K[3][iGlu] = -1;
1061 fPyjets->K[4][iGlu] = -1;
1062
1063 fPyjets->P[0][iGlu+1] = px2;
1064 fPyjets->P[1][iGlu+1] = py2;
1065 fPyjets->P[2][iGlu+1] = pz2;
1066 fPyjets->P[3][iGlu+1] = pst;
1067 fPyjets->P[4][iGlu+1] = 0.;
1068
4e383037 1069 fPyjets->K[0][iGlu+1] = 1;
1070 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
0f482ae4 1071 fPyjets->K[1][iGlu+1] = 21;
4e383037 1072 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
0f482ae4 1073 fPyjets->K[3][iGlu+1] = -1;
1074 fPyjets->K[4][iGlu+1] = -1;
1075 SetMSTU(1,0);
1076 SetMSTU(2,0);
1077 //
1078 // Boost back
1079 //
1080 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1081 }
4e383037 1082/*
1083 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1084 Double_t px, py, pz;
1085 px = fPyjets->P[0][ig];
1086 py = fPyjets->P[1][ig];
1087 pz = fPyjets->P[2][ig];
1088 TVector3 v(px, py, pz);
1089 v.RotateZ(-phiq[isys]);
1090 v.RotateY(-thetaq[isys]);
1091 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1092 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1093 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1094 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1095 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1096 pxs += jtKick * TMath::Cos(phiKick);
1097 pys += jtKick * TMath::Sin(phiKick);
1098 TVector3 w(pxs, pys, pzs);
1099 w.RotateY(thetaq[isys]);
1100 w.RotateZ(phiq[isys]);
1101 fPyjets->P[0][ig] = w.X();
1102 fPyjets->P[1][ig] = w.Y();
1103 fPyjets->P[2][ig] = w.Z();
1104 fPyjets->P[2][ig] = w.Mag();
1105 }
1106*/
1107 } // kGluon
1108
6e90ad26 1109
4e383037 1110 // Check energy conservation
0f482ae4 1111 Double_t pxs = 0.;
1112 Double_t pys = 0.;
1113 Double_t pzs = 0.;
1114 Double_t es = 14000.;
1115
1116 for (Int_t i = 0; i < numpart; i++)
1117 {
1118 kst = fPyjets->K[0][i];
1119 if (kst != 1 && kst != 2) continue;
1120 pxs += fPyjets->P[0][i];
1121 pys += fPyjets->P[1][i];
1122 pzs += fPyjets->P[2][i];
1123 es -= fPyjets->P[3][i];
1124 }
1125 if (TMath::Abs(pxs) > 1.e-2 ||
1126 TMath::Abs(pys) > 1.e-2 ||
1127 TMath::Abs(pzs) > 1.e-1) {
1128 printf("%e %e %e %e\n", pxs, pys, pzs, es);
4e383037 1129// Fatal("Quench()", "4-Momentum non-conservation");
452af8c7 1130 }
4e383037 1131
1132 } // end quenching loop (systems)
6e90ad26 1133// Clean-up
0f482ae4 1134 for (Int_t i = 0; i < numpart; i++)
1135 {
4e383037 1136 imo = fPyjets->K[2][i];
1137 if (imo > 1000) {
1138 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1139 }
0f482ae4 1140 }
4e383037 1141// this->Pylist(1);
0f482ae4 1142} // end quench
90d7b703 1143
992f2843 1144
1145void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1146{
1147 // Igor Lokthine's quenching routine
1148 pyquen(a, ibf, b);
1149}
b280c4cc 1150
16a82508 1151void AliPythia::Pyevnw()
1152{
1153 // New multiple interaction scenario
1154 pyevnw();
1155}
1156
b280c4cc 1157void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1158{
1159 // Return event specific quenching parameters
1160 xp = fXJet;
1161 yp = fYJet;
1162 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1163
1164}
1165
3dc3ec94 1166void AliPythia::ConfigHeavyFlavor()
1167{
1168 //
1169 // Default configuration for Heavy Flavor production
1170 //
1171 // All QCD processes
1172 //
1173 SetMSEL(1);
1174
1175 // No multiple interactions
1176 SetMSTP(81,0);
3dc3ec94 1177 // Initial/final parton shower on (Pythia default)
1178 SetMSTP(61,1);
1179 SetMSTP(71,1);
1180
1181 // 2nd order alpha_s
1182 SetMSTP(2,2);
1183
1184 // QCD scales
1185 SetMSTP(32,2);
1186 SetPARP(34,1.0);
0c0f2010 1187 SetMSTU(16,2);
3dc3ec94 1188}
e0e89f40 1189
1190void AliPythia::AtlasTuning()
1191{
1192 //
1193 // Configuration for the ATLAS tuning
1194 SetMSTP(51, kCTEQ5L); // CTEQ5L pdf
1195 SetMSTP(81,1); // Multiple Interactions ON
1196 SetMSTP(82,4); // Double Gaussian Model
1197 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1198 SetPARP(89,1000.); // [GeV] Ref. energy
1199 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1200 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1201 SetPARP(84,0.5); // Core radius
1202 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1203 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1204 SetPARP(67,1); // Regulates Initial State Radiation
1205}