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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);
1c50ec12 84 // Select structure function
8d2cd130 85 SetMSTP(52,2);
86 SetMSTP(51,strucfunc);
1c50ec12 87 // Particles produced in string fragmentation point directly to either of the two endpoints
88 // of the string (depending in the side they were generated from).
89 SetMSTU(16,2);
90
8d2cd130 91//
92// Pythia initialisation for selected processes//
93//
94// Make MSEL clean
95//
96 for (Int_t i=1; i<= 200; i++) {
97 SetMSUB(i,0);
98 }
99// select charm production
100 switch (process)
101 {
65f2626c 102 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
103// Multiple interactions on.
104 SetMSTP(81,1);
105// Double Gaussian matter distribution.
106 SetMSTP(82,4);
107 SetPARP(83,0.5);
108 SetPARP(84,0.4);
109// pT0.
110 SetPARP(82,2.0);
111// Reference energy for pT0 and energy rescaling pace.
112 SetPARP(89,1800);
113 SetPARP(90,0.25);
114// String drawing almost completely minimizes string length.
115 SetPARP(85,0.9);
116 SetPARP(86,0.95);
117// ISR and FSR activity.
118 SetPARP(67,4);
119 SetPARP(71,4);
120// Lambda_FSR scale.
121 SetPARJ(81,0.29);
122 break;
123 case kPyOldUEQ2ordered2:
124// Old underlying events with Q2 ordered QCD processes
125// Multiple interactions on.
126 SetMSTP(81,1);
127// Double Gaussian matter distribution.
128 SetMSTP(82,4);
129 SetPARP(83,0.5);
130 SetPARP(84,0.4);
131// pT0.
132 SetPARP(82,2.0);
133// Reference energy for pT0 and energy rescaling pace.
134 SetPARP(89,1800);
135 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
136// String drawing almost completely minimizes string length.
137 SetPARP(85,0.9);
138 SetPARP(86,0.95);
139// ISR and FSR activity.
140 SetPARP(67,4);
141 SetPARP(71,4);
142// Lambda_FSR scale.
143 SetPARJ(81,0.29);
144 break;
145 case kPyOldPopcorn:
146// Old production mechanism: Old Popcorn
147 SetMSEL(1);
148 SetMSTJ(12,3);
149// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
150 SetMSTP(88,2);
151// (D=1)see can be used to form baryons (BARYON JUNCTION)
152 SetMSTJ(1,1);
e0e89f40 153 AtlasTuning();
65f2626c 154 break;
8d2cd130 155 case kPyCharm:
156 SetMSEL(4);
8d2cd130 157// heavy quark masses
158
159 SetPMAS(4,1,1.2);
8d2cd130 160//
161// primordial pT
162 SetMSTP(91,1);
163 SetPARP(91,1.);
164 SetPARP(93,5.);
165//
166 break;
167 case kPyBeauty:
168 SetMSEL(5);
169 SetPMAS(5,1,4.75);
8d2cd130 170 break;
171 case kPyJpsi:
172 SetMSEL(0);
173// gg->J/Psi g
174 SetMSUB(86,1);
175 break;
176 case kPyJpsiChi:
177 SetMSEL(0);
178// gg->J/Psi g
179 SetMSUB(86,1);
180// gg-> chi_0c g
181 SetMSUB(87,1);
182// gg-> chi_1c g
183 SetMSUB(88,1);
184// gg-> chi_2c g
185 SetMSUB(89,1);
186 break;
187 case kPyCharmUnforced:
188 SetMSEL(0);
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:
197 SetMSEL(0);
198// gq->qg
199 SetMSUB(28,1);
200// gg->qq
201 SetMSUB(53,1);
202// gg->gg
203 SetMSUB(68,1);
204 break;
205 case kPyMb:
206// Minimum Bias pp-Collisions
207//
208//
209// select Pythia min. bias model
210 SetMSEL(0);
511db649 211 SetMSUB(92,1); // single diffraction AB-->XB
212 SetMSUB(93,1); // single diffraction AB-->AX
213 SetMSUB(94,1); // double diffraction
214 SetMSUB(95,1); // low pt production
215
e0e89f40 216 AtlasTuning();
511db649 217 break;
8d2cd130 218 case kPyMbNonDiffr:
219// Minimum Bias pp-Collisions
220//
221//
222// select Pythia min. bias model
223 SetMSEL(0);
511db649 224 SetMSUB(95,1); // low pt production
0f482ae4 225
d7de4a67 226 AtlasTuning();
227 break;
228 case kPyMbMSEL1:
229 ConfigHeavyFlavor();
230// Intrinsic <kT^2>
231 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
232 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
233 SetPARP(93,5.); // Upper cut-off
234// Set Q-quark mass
235 SetPMAS(4,1,1.2); // Charm quark mass
236 SetPMAS(5,1,4.78); // Beauty quark mass
237 SetPARP(71,4.); // Defaut value
238// Atlas Tuning
e0e89f40 239 AtlasTuning();
8d2cd130 240 break;
241 case kPyJets:
242//
243// QCD Jets
244//
245 SetMSEL(1);
65f2626c 246 // Pythia Tune A (CDF)
247 //
248 SetPARP(67,4.); // Regulates Initial State Radiation
249 SetMSTP(82,4); // Double Gaussian Model
250 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
251 SetPARP(84,0.4); // Core radius
252 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
253 SetPARP(86,0.95); // Regulates gluon prod. mechanism
254 SetPARP(89,1800.); // [GeV] Ref. energy
255 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
256 break;
8d2cd130 257 case kPyDirectGamma:
258 SetMSEL(10);
259 break;
adf4d898 260 case kPyCharmPbPbMNR:
261 case kPyD0PbPbMNR:
90d7b703 262 case kPyDPlusPbPbMNR:
e0e89f40 263 case kPyDPlusStrangePbPbMNR:
90d7b703 264 // Tuning of Pythia parameters aimed to get a resonable agreement
265 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
266 // c-cbar single inclusive and double differential distributions.
267 // This parameter settings are meant to work with Pb-Pb collisions
268 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
269 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
270 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 271 ConfigHeavyFlavor();
90d7b703 272 // Intrinsic <kT>
273 SetMSTP(91,1);
274 SetPARP(91,1.304);
275 SetPARP(93,6.52);
90d7b703 276 // Set c-quark mass
277 SetPMAS(4,1,1.2);
8d2cd130 278 break;
adf4d898 279 case kPyCharmpPbMNR:
280 case kPyD0pPbMNR:
90d7b703 281 case kPyDPluspPbMNR:
e0e89f40 282 case kPyDPlusStrangepPbMNR:
90d7b703 283 // Tuning of Pythia parameters aimed to get a resonable agreement
284 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
285 // c-cbar single inclusive and double differential distributions.
286 // This parameter settings are meant to work with p-Pb collisions
287 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
288 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
289 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 290 ConfigHeavyFlavor();
90d7b703 291 // Intrinsic <kT>
3dc3ec94 292 SetMSTP(91,1);
293 SetPARP(91,1.16);
294 SetPARP(93,5.8);
295
90d7b703 296 // Set c-quark mass
3dc3ec94 297 SetPMAS(4,1,1.2);
adf4d898 298 break;
299 case kPyCharmppMNR:
300 case kPyD0ppMNR:
90d7b703 301 case kPyDPlusppMNR:
e0e89f40 302 case kPyDPlusStrangeppMNR:
90d7b703 303 // Tuning of Pythia parameters aimed to get a resonable agreement
304 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
305 // c-cbar single inclusive and double differential distributions.
306 // This parameter settings are meant to work with pp collisions
307 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
308 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
309 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 310 ConfigHeavyFlavor();
90d7b703 311 // Intrinsic <kT^2>
3dc3ec94 312 SetMSTP(91,1);
313 SetPARP(91,1.);
314 SetPARP(93,5.);
315
90d7b703 316 // Set c-quark mass
3dc3ec94 317 SetPMAS(4,1,1.2);
adf4d898 318 break;
e0e89f40 319 case kPyCharmppMNRwmi:
320 // Tuning of Pythia parameters aimed to get a resonable agreement
321 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
322 // c-cbar single inclusive and double differential distributions.
323 // This parameter settings are meant to work with pp collisions
324 // and with kCTEQ5L PDFs.
325 // Added multiple interactions according to ATLAS tune settings.
326 // To get a "reasonable" agreement with MNR results, events have to be
327 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
328 // set to 2.76 GeV.
329 // To get a "perfect" agreement with MNR results, events have to be
330 // generated in four ptHard bins with the following relative
331 // normalizations:
332 // 2.76-3 GeV: 25%
333 // 3-4 GeV: 40%
334 // 4-8 GeV: 29%
335 // >8 GeV: 6%
336 ConfigHeavyFlavor();
337 // Intrinsic <kT^2>
338 SetMSTP(91,1);
339 SetPARP(91,1.);
340 SetPARP(93,5.);
341
342 // Set c-quark mass
343 SetPMAS(4,1,1.2);
344 AtlasTuning();
345 break;
adf4d898 346 case kPyBeautyPbPbMNR:
8d2cd130 347 // Tuning of Pythia parameters aimed to get a resonable agreement
348 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
349 // b-bbar single inclusive and double differential distributions.
350 // This parameter settings are meant to work with Pb-Pb collisions
351 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
352 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
353 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 354 ConfigHeavyFlavor();
8d2cd130 355 // QCD scales
3dc3ec94 356 SetPARP(67,1.0);
357 SetPARP(71,1.0);
adf4d898 358 // Intrinsic <kT>
3dc3ec94 359 SetMSTP(91,1);
360 SetPARP(91,2.035);
361 SetPARP(93,10.17);
8d2cd130 362 // Set b-quark mass
3dc3ec94 363 SetPMAS(5,1,4.75);
adf4d898 364 break;
365 case kPyBeautypPbMNR:
366 // Tuning of Pythia parameters aimed to get a resonable agreement
367 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
368 // b-bbar single inclusive and double differential distributions.
369 // This parameter settings are meant to work with p-Pb collisions
370 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
371 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
372 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 373 ConfigHeavyFlavor();
adf4d898 374 // QCD scales
3dc3ec94 375 SetPARP(67,1.0);
376 SetPARP(71,1.0);
adf4d898 377 // Intrinsic <kT>
3dc3ec94 378 SetMSTP(91,1);
379 SetPARP(91,1.60);
380 SetPARP(93,8.00);
adf4d898 381 // Set b-quark mass
3dc3ec94 382 SetPMAS(5,1,4.75);
adf4d898 383 break;
384 case kPyBeautyppMNR:
385 // Tuning of Pythia parameters aimed to get a resonable agreement
386 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
387 // b-bbar single inclusive and double differential distributions.
388 // This parameter settings are meant to work with pp collisions
389 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
390 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
391 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 392 ConfigHeavyFlavor();
adf4d898 393 // QCD scales
3dc3ec94 394 SetPARP(67,1.0);
395 SetPARP(71,1.0);
396
397 // Intrinsic <kT>
398 SetMSTP(91,1);
399 SetPARP(91,1.);
400 SetPARP(93,5.);
401
402 // Set b-quark mass
403 SetPMAS(5,1,4.75);
8d2cd130 404 break;
e0e89f40 405 case kPyBeautyppMNRwmi:
406 // Tuning of Pythia parameters aimed to get a resonable agreement
407 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
408 // b-bbar single inclusive and double differential distributions.
409 // This parameter settings are meant to work with pp collisions
410 // and with kCTEQ5L PDFs.
411 // Added multiple interactions according to ATLAS tune settings.
412 // To get a "reasonable" agreement with MNR results, events have to be
413 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
414 // set to 2.76 GeV.
415 // To get a "perfect" agreement with MNR results, events have to be
416 // generated in four ptHard bins with the following relative
417 // normalizations:
418 // 2.76-4 GeV: 5%
419 // 4-6 GeV: 31%
420 // 6-8 GeV: 28%
421 // >8 GeV: 36%
422 ConfigHeavyFlavor();
423 // QCD scales
424 SetPARP(67,1.0);
425 SetPARP(71,1.0);
426
427 // Intrinsic <kT>
428 SetMSTP(91,1);
429 SetPARP(91,1.);
430 SetPARP(93,5.);
431
432 // Set b-quark mass
433 SetPMAS(5,1,4.75);
434
435 AtlasTuning();
436 break;
589380c6 437 case kPyW:
438
439 //Inclusive production of W+/-
440 SetMSEL(0);
441 //f fbar -> W+
442 SetMSUB(2,1);
443 // //f fbar -> g W+
444 // SetMSUB(16,1);
445 // //f fbar -> gamma W+
446 // SetMSUB(20,1);
447 // //f g -> f W+
448 // SetMSUB(31,1);
449 // //f gamma -> f W+
450 // SetMSUB(36,1);
451
452 // Initial/final parton shower on (Pythia default)
453 // With parton showers on we are generating "W inclusive process"
454 SetMSTP(61,1); //Initial QCD & QED showers on
455 SetMSTP(71,1); //Final QCD & QED showers on
456
457 break;
0f6ee828 458
459 case kPyZ:
460
461 //Inclusive production of Z
462 SetMSEL(0);
463 //f fbar -> Z/gamma
464 SetMSUB(1,1);
465
466 // // f fbar -> g Z/gamma
467 // SetMSUB(15,1);
468 // // f fbar -> gamma Z/gamma
469 // SetMSUB(19,1);
470 // // f g -> f Z/gamma
471 // SetMSUB(30,1);
472 // // f gamma -> f Z/gamma
473 // SetMSUB(35,1);
474
475 //only Z included, not gamma
476 SetMSTP(43,2);
477
478 // Initial/final parton shower on (Pythia default)
479 // With parton showers on we are generating "Z inclusive process"
480 SetMSTP(61,1); //Initial QCD & QED showers on
481 SetMSTP(71,1); //Final QCD & QED showers on
482
483 break;
484
8d2cd130 485 }
486//
487// Initialize PYTHIA
488 SetMSTP(41,1); // all resonance decays switched on
489
490 Initialize("CMS","p","p",fEcms);
491
492}
493
494Int_t AliPythia::CheckedLuComp(Int_t kf)
495{
496// Check Lund particle code (for debugging)
497 Int_t kc=Pycomp(kf);
498 printf("\n Lucomp kf,kc %d %d",kf,kc);
499 return kc;
500}
501
502void AliPythia::SetNuclei(Int_t a1, Int_t a2)
503{
504// Treat protons as inside nuclei with mass numbers a1 and a2
505// The MSTP array in the PYPARS common block is used to enable and
506// select the nuclear structure functions.
507// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
508// =1: internal PYTHIA acording to MSTP(51)
509// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
510// If the following mass number both not equal zero, nuclear corrections of the stf are used.
511// MSTP(192) : Mass number of nucleus side 1
512// MSTP(193) : Mass number of nucleus side 2
513 SetMSTP(52,2);
514 SetMSTP(192, a1);
515 SetMSTP(193, a2);
516}
517
518
519AliPythia* AliPythia::Instance()
520{
521// Set random number generator
522 if (fgAliPythia) {
523 return fgAliPythia;
524 } else {
525 fgAliPythia = new AliPythia();
526 return fgAliPythia;
527 }
528}
529
530void AliPythia::PrintParticles()
531{
532// Print list of particl properties
533 Int_t np = 0;
c31f1d37 534 char* name = new char[16];
8d2cd130 535 for (Int_t kf=0; kf<1000000; kf++) {
536 for (Int_t c = 1; c > -2; c-=2) {
8d2cd130 537 Int_t kc = Pycomp(c*kf);
538 if (kc) {
539 Float_t mass = GetPMAS(kc,1);
540 Float_t width = GetPMAS(kc,2);
541 Float_t tau = GetPMAS(kc,4);
c31f1d37 542
8d2cd130 543 Pyname(kf,name);
544
545 np++;
546
547 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
548 c*kf, name, mass, width, tau);
549 }
550 }
551 }
552 printf("\n Number of particles %d \n \n", np);
553}
554
555void AliPythia::ResetDecayTable()
556{
557// Set default values for pythia decay switches
558 Int_t i;
559 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
560 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
561}
562
563void AliPythia::SetDecayTable()
564{
565// Set default values for pythia decay switches
566//
567 Int_t i;
568 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
569 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
570}
571
572void AliPythia::Pyclus(Int_t& njet)
573{
574// Call Pythia clustering algorithm
575//
576 pyclus(njet);
577}
578
579void AliPythia::Pycell(Int_t& njet)
580{
581// Call Pythia jet reconstruction algorithm
582//
583 pycell(njet);
584}
585
452af8c7 586void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
587{
588// Call Pythia jet reconstruction algorithm
589//
452af8c7 590 pyshow(ip1, ip2, qmax);
591}
592
593void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
594{
595 pyrobo(imi, ima, the, phi, bex, bey, bez);
596}
597
598
599
86b6ad68 600void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod)
0f482ae4 601{
602// Initializes
603// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
604// (2) The nuclear geometry using the Glauber Model
605//
606
607
608 fGlauber = new AliFastGlauber();
609 fGlauber->Init(2);
610 fGlauber->SetCentralityClass(cMin, cMax);
611
612 fQuenchingWeights = new AliQuenchingWeights();
613 fQuenchingWeights->InitMult();
86b6ad68 614 fQuenchingWeights->SetK(k);
0f482ae4 615 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
0f482ae4 616}
617
618
452af8c7 619void AliPythia::Quench()
620{
621//
622//
623// Simple Jet Quenching routine:
624// =============================
625// The jet formed by all final state partons radiated by the parton created
0f482ae4 626// in the hard collisions is quenched by a factor (1-z) using light cone variables in
627// the initial parton reference frame:
452af8c7 628// (E + p_z)new = (1-z) (E + p_z)old
629//
0f482ae4 630//
631//
632//
452af8c7 633// The lost momentum is first balanced by one gluon with virtuality > 0.
634// Subsequently the gluon splits to yield two gluons with E = p.
635//
0f482ae4 636//
637//
4e383037 638 static Float_t eMean = 0.;
639 static Int_t icall = 0;
0f482ae4 640
c2c598a3 641 Double_t p0[4][5];
642 Double_t p1[4][5];
643 Double_t p2[4][5];
644 Int_t klast[4] = {-1, -1, -1, -1};
452af8c7 645
646 Int_t numpart = fPyjets->N;
86b6ad68 647 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
c2c598a3 648 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
649 Bool_t quenched[4];
b280c4cc 650 Double_t wjtKick[4];
c2c598a3 651 Int_t nGluon[4];
86b6ad68 652 Int_t qPdg[4];
0f482ae4 653 Int_t imo, kst, pdg;
b280c4cc 654
511db649 655//
c2c598a3 656// Sore information about Primary partons
657//
658// j =
659// 0, 1 partons from hard scattering
660// 2, 3 partons from initial state radiation
661//
662 for (Int_t i = 2; i <= 7; i++) {
663 Int_t j = 0;
664 // Skip gluons that participate in hard scattering
665 if (i == 4 || i == 5) continue;
666 // Gluons from hard Scattering
667 if (i == 6 || i == 7) {
668 j = i - 6;
669 pxq[j] = fPyjets->P[0][i];
670 pyq[j] = fPyjets->P[1][i];
671 pzq[j] = fPyjets->P[2][i];
672 eq[j] = fPyjets->P[3][i];
673 mq[j] = fPyjets->P[4][i];
674 } else {
675 // Gluons from initial state radiation
676 //
677 // Obtain 4-momentum vector from difference between original parton and parton after gluon
678 // radiation. Energy is calculated independently because initial state radition does not
679 // conserve strictly momentum and energy for each partonic system independently.
680 //
681 // Not very clean. Should be improved !
682 //
683 //
684 j = i;
685 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
686 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
687 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
688 mq[j] = fPyjets->P[4][i];
689 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
690 }
691//
692// Calculate some kinematic variables
511db649 693//
4e383037 694 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
0f482ae4 695 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
696 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
697 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
698 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
86b6ad68 699 qPdg[j] = fPyjets->K[1][i];
700 }
701
702 Double_t int0[4];
703 Double_t int1[4];
86b6ad68 704
b280c4cc 705 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
706
86b6ad68 707 for (Int_t j = 0; j < 4; j++) {
c2c598a3 708 //
709 // Quench only central jets and with E > 10.
710 //
86b6ad68 711
712
713 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
714 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
715
c2c598a3 716 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
b280c4cc 717 fZQuench[j] = 0.;
0f482ae4 718 } else {
c2c598a3 719 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
4e383037 720 icall ++;
721 eMean += eloss;
722 }
0f482ae4 723 //
724 // Extra pt
86b6ad68 725 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
726 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
0f482ae4 727 //
728 // Fractional energy loss
b280c4cc 729 fZQuench[j] = eloss / eq[j];
0f482ae4 730 //
731 // Avoid complete loss
732 //
b280c4cc 733 if (fZQuench[j] == 1.) fZQuench[j] = 0.95;
0f482ae4 734 //
735 // Some debug printing
86b6ad68 736
737
bf9bb016 738// 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",
739// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
4e383037 740
b280c4cc 741// fZQuench[j] = 0.8;
742// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
0f482ae4 743 }
4e383037 744
b280c4cc 745 quenched[j] = (fZQuench[j] > 0.01);
4e383037 746 } // primary partons
c2c598a3 747
b280c4cc 748
749
6e90ad26 750 Double_t pNew[1000][4];
751 Int_t kNew[1000];
752 Int_t icount = 0;
b280c4cc 753 Double_t zquench[4];
754
6e90ad26 755//
4e383037 756// System Loop
c2c598a3 757 for (Int_t isys = 0; isys < 4; isys++) {
6e90ad26 758// Skip to next system if not quenched.
4e383037 759 if (!quenched[isys]) continue;
760
b280c4cc 761 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
4e383037 762 if (nGluon[isys] > 6) nGluon[isys] = 6;
b280c4cc 763 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
4e383037 764 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
0f482ae4 765
4e383037 766
767
768 Int_t igMin = -1;
769 Int_t igMax = -1;
770 Double_t pg[4] = {0., 0., 0., 0.};
771
772//
773// Loop on radiation events
774
775 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
6e90ad26 776 while (1) {
777 icount = 0;
778 for (Int_t k = 0; k < 4; k++)
779 {
780 p0[isys][k] = 0.;
781 p1[isys][k] = 0.;
782 p2[isys][k] = 0.;
783 }
784// Loop over partons
785 for (Int_t i = 0; i < numpart; i++)
786 {
787 imo = fPyjets->K[2][i];
788 kst = fPyjets->K[0][i];
789 pdg = fPyjets->K[1][i];
790
791
792
0f482ae4 793// Quarks and gluons only
6e90ad26 794 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
0f482ae4 795// Particles from hard scattering only
c2c598a3 796
6e90ad26 797 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
c2c598a3 798 Int_t imom = imo % 1000;
799 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
800 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
801
6e90ad26 802
0f482ae4 803// Skip comment lines
6e90ad26 804 if (kst != 1 && kst != 2) continue;
0f482ae4 805//
806// Parton kinematic
6e90ad26 807 px = fPyjets->P[0][i];
808 py = fPyjets->P[1][i];
809 pz = fPyjets->P[2][i];
810 e = fPyjets->P[3][i];
811 m = fPyjets->P[4][i];
812 pt = TMath::Sqrt(px * px + py * py);
813 p = TMath::Sqrt(px * px + py * py + pz * pz);
814 phi = TMath::Pi() + TMath::ATan2(-py, -px);
815 theta = TMath::ATan2(pt, pz);
816
0f482ae4 817//
c2c598a3 818// Save 4-momentum sum for balancing
819 Int_t index = isys;
6e90ad26 820
821 p0[index][0] += px;
822 p0[index][1] += py;
823 p0[index][2] += pz;
824 p0[index][3] += e;
6e90ad26 825
826 klast[index] = i;
827
0f482ae4 828//
829// Fractional energy loss
b280c4cc 830 Double_t z = zquench[index];
4e383037 831
c2c598a3 832
4e383037 833// Don't fully quench radiated gluons
834//
835 if (imo > 1000) {
836// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
837//
838
c2c598a3 839 z = 0.02;
4e383037 840 }
c2c598a3 841// printf("z: %d %f\n", imo, z);
842
4e383037 843
844//
6e90ad26 845
846 //
847 //
848 // Transform into frame in which initial parton is along z-axis
849 //
850 TVector3 v(px, py, pz);
851 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
852 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
853
854 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
855 Double_t mt2 = jt * jt + m * m;
856 Double_t zmax = 1.;
857 //
858 // Kinematic limit on z
859 //
4e383037 860 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
6e90ad26 861 //
862 // Change light-cone kinematics rel. to initial parton
863 //
864 Double_t eppzOld = e + pl;
865 Double_t empzOld = e - pl;
866
867 Double_t eppzNew = (1. - z) * eppzOld;
868 Double_t empzNew = empzOld - mt2 * z / eppzOld;
869 Double_t eNew = 0.5 * (eppzNew + empzNew);
870 Double_t plNew = 0.5 * (eppzNew - empzNew);
871
872 Double_t jtNew;
873 //
874 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
875 Double_t mt2New = eppzNew * empzNew;
876 if (mt2New < 1.e-8) mt2New = 0.;
4e383037 877 if (z < zmax) {
878 if (m * m > mt2New) {
879 //
880 // This should not happen
881 //
882 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
883 jtNew = 0;
884 } else {
885 jtNew = TMath::Sqrt(mt2New - m * m);
886 }
6e90ad26 887 } else {
4e383037 888 // If pT is to small (probably a leading massive particle) we scale only the energy
889 // This can cause negative masses of the radiated gluon
890 // Let's hope for the best ...
891 jtNew = jt;
892 eNew = TMath::Sqrt(plNew * plNew + mt2);
893
6e90ad26 894 }
6e90ad26 895 //
896 // Calculate new px, py
897 //
898 Double_t pxNew = jtNew / jt * pxs;
899 Double_t pyNew = jtNew / jt * pys;
900
901// Double_t dpx = pxs - pxNew;
902// Double_t dpy = pys - pyNew;
903// Double_t dpz = pl - plNew;
904// Double_t de = e - eNew;
905// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
906// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
907// printf("New mass (2) %e %e \n", pxNew, pyNew);
908 //
909 // Rotate back
910 //
911 TVector3 w(pxNew, pyNew, plNew);
912 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
913 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
914
915 p1[index][0] += pxNew;
916 p1[index][1] += pyNew;
917 p1[index][2] += plNew;
918 p1[index][3] += eNew;
919 //
920 // Updated 4-momentum vectors
921 //
922 pNew[icount][0] = pxNew;
923 pNew[icount][1] = pyNew;
924 pNew[icount][2] = plNew;
925 pNew[icount][3] = eNew;
926 kNew[icount] = i;
927 icount++;
928 } // parton loop
0f482ae4 929 //
6e90ad26 930 // Check if there was phase-space for quenching
0f482ae4 931 //
0f482ae4 932
6e90ad26 933 if (icount == 0) quenched[isys] = kFALSE;
934 if (!quenched[isys]) break;
935
936 for (Int_t j = 0; j < 4; j++)
937 {
938 p2[isys][j] = p0[isys][j] - p1[isys][j];
939 }
940 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 941 if (p2[isys][4] > 0.) {
942 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
943 break;
944 } else {
b280c4cc 945 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
4e383037 946 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 947 if (p2[isys][4] < -0.01) {
4e383037 948 printf("Negative mass squared !\n");
949 // Here we have to put the gluon back to mass shell
950 // This will lead to a small energy imbalance
951 p2[isys][4] = 0.;
952 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
953 break;
6e90ad26 954 } else {
955 p2[isys][4] = 0.;
956 break;
957 }
958 }
6e90ad26 959 /*
6e90ad26 960 zHeavy *= 0.98;
961 printf("zHeavy lowered to %f\n", zHeavy);
962 if (zHeavy < 0.01) {
963 printf("No success ! \n");
964 icount = 0;
965 quenched[isys] = kFALSE;
966 break;
967 }
4e383037 968 */
969 } // iteration on z (while)
970
6e90ad26 971// Update event record
972 for (Int_t k = 0; k < icount; k++) {
973// 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] );
974 fPyjets->P[0][kNew[k]] = pNew[k][0];
975 fPyjets->P[1][kNew[k]] = pNew[k][1];
976 fPyjets->P[2][kNew[k]] = pNew[k][2];
977 fPyjets->P[3][kNew[k]] = pNew[k][3];
0f482ae4 978 }
4e383037 979 //
980 // Add the gluons
981 //
982 Int_t ish = 0;
1837e95c 983 Int_t iGlu;
4e383037 984 if (!quenched[isys]) continue;
0f482ae4 985//
986// Last parton from shower i
4e383037 987 Int_t in = klast[isys];
0f482ae4 988//
989// Continue if no parton in shower i selected
990 if (in == -1) continue;
991//
992// If this is the second initial parton and it is behind the first move pointer by previous ish
4e383037 993 if (isys == 1 && klast[1] > klast[0]) in += ish;
0f482ae4 994//
995// Starting index
452af8c7 996
4e383037 997// jmin = in - 1;
0f482ae4 998// How many additional gluons will be generated
999 ish = 1;
4e383037 1000 if (p2[isys][4] > 0.05) ish = 2;
0f482ae4 1001//
1002// Position of gluons
4e383037 1003 iGlu = numpart;
1004 if (iglu == 0) igMin = iGlu;
1005 igMax = iGlu;
0f482ae4 1006 numpart += ish;
1007 (fPyjets->N) += ish;
4e383037 1008
0f482ae4 1009 if (ish == 1) {
4e383037 1010 fPyjets->P[0][iGlu] = p2[isys][0];
1011 fPyjets->P[1][iGlu] = p2[isys][1];
1012 fPyjets->P[2][iGlu] = p2[isys][2];
1013 fPyjets->P[3][iGlu] = p2[isys][3];
1014 fPyjets->P[4][iGlu] = p2[isys][4];
0f482ae4 1015
4e383037 1016 fPyjets->K[0][iGlu] = 1;
1017 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
0f482ae4 1018 fPyjets->K[1][iGlu] = 21;
4e383037 1019 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1020 fPyjets->K[3][iGlu] = -1;
1021 fPyjets->K[4][iGlu] = -1;
4e383037 1022
1023 pg[0] += p2[isys][0];
1024 pg[1] += p2[isys][1];
1025 pg[2] += p2[isys][2];
1026 pg[3] += p2[isys][3];
0f482ae4 1027 } else {
1028 //
1029 // Split gluon in rest frame.
1030 //
4e383037 1031 Double_t bx = p2[isys][0] / p2[isys][3];
1032 Double_t by = p2[isys][1] / p2[isys][3];
1033 Double_t bz = p2[isys][2] / p2[isys][3];
1034 Double_t pst = p2[isys][4] / 2.;
0f482ae4 1035 //
1036 // Isotropic decay ????
1037 Double_t cost = 2. * gRandom->Rndm() - 1.;
1038 Double_t sint = TMath::Sqrt(1. - cost * cost);
1039 Double_t phi = 2. * TMath::Pi() * gRandom->Rndm();
1040
1041 Double_t pz1 = pst * cost;
1042 Double_t pz2 = -pst * cost;
1043 Double_t pt1 = pst * sint;
1044 Double_t pt2 = -pst * sint;
1045 Double_t px1 = pt1 * TMath::Cos(phi);
1046 Double_t py1 = pt1 * TMath::Sin(phi);
1047 Double_t px2 = pt2 * TMath::Cos(phi);
1048 Double_t py2 = pt2 * TMath::Sin(phi);
1049
1050 fPyjets->P[0][iGlu] = px1;
1051 fPyjets->P[1][iGlu] = py1;
1052 fPyjets->P[2][iGlu] = pz1;
1053 fPyjets->P[3][iGlu] = pst;
1054 fPyjets->P[4][iGlu] = 0.;
1055
4e383037 1056 fPyjets->K[0][iGlu] = 1 ;
0f482ae4 1057 fPyjets->K[1][iGlu] = 21;
4e383037 1058 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1059 fPyjets->K[3][iGlu] = -1;
1060 fPyjets->K[4][iGlu] = -1;
1061
1062 fPyjets->P[0][iGlu+1] = px2;
1063 fPyjets->P[1][iGlu+1] = py2;
1064 fPyjets->P[2][iGlu+1] = pz2;
1065 fPyjets->P[3][iGlu+1] = pst;
1066 fPyjets->P[4][iGlu+1] = 0.;
1067
4e383037 1068 fPyjets->K[0][iGlu+1] = 1;
1069 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
0f482ae4 1070 fPyjets->K[1][iGlu+1] = 21;
4e383037 1071 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
0f482ae4 1072 fPyjets->K[3][iGlu+1] = -1;
1073 fPyjets->K[4][iGlu+1] = -1;
1074 SetMSTU(1,0);
1075 SetMSTU(2,0);
1076 //
1077 // Boost back
1078 //
1079 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1080 }
4e383037 1081/*
1082 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1083 Double_t px, py, pz;
1084 px = fPyjets->P[0][ig];
1085 py = fPyjets->P[1][ig];
1086 pz = fPyjets->P[2][ig];
1087 TVector3 v(px, py, pz);
1088 v.RotateZ(-phiq[isys]);
1089 v.RotateY(-thetaq[isys]);
1090 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1091 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1092 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1093 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1094 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1095 pxs += jtKick * TMath::Cos(phiKick);
1096 pys += jtKick * TMath::Sin(phiKick);
1097 TVector3 w(pxs, pys, pzs);
1098 w.RotateY(thetaq[isys]);
1099 w.RotateZ(phiq[isys]);
1100 fPyjets->P[0][ig] = w.X();
1101 fPyjets->P[1][ig] = w.Y();
1102 fPyjets->P[2][ig] = w.Z();
1103 fPyjets->P[2][ig] = w.Mag();
1104 }
1105*/
1106 } // kGluon
1107
6e90ad26 1108
4e383037 1109 // Check energy conservation
0f482ae4 1110 Double_t pxs = 0.;
1111 Double_t pys = 0.;
1112 Double_t pzs = 0.;
1113 Double_t es = 14000.;
1114
1115 for (Int_t i = 0; i < numpart; i++)
1116 {
1117 kst = fPyjets->K[0][i];
1118 if (kst != 1 && kst != 2) continue;
1119 pxs += fPyjets->P[0][i];
1120 pys += fPyjets->P[1][i];
1121 pzs += fPyjets->P[2][i];
1122 es -= fPyjets->P[3][i];
1123 }
1124 if (TMath::Abs(pxs) > 1.e-2 ||
1125 TMath::Abs(pys) > 1.e-2 ||
1126 TMath::Abs(pzs) > 1.e-1) {
1127 printf("%e %e %e %e\n", pxs, pys, pzs, es);
4e383037 1128// Fatal("Quench()", "4-Momentum non-conservation");
452af8c7 1129 }
4e383037 1130
1131 } // end quenching loop (systems)
6e90ad26 1132// Clean-up
0f482ae4 1133 for (Int_t i = 0; i < numpart; i++)
1134 {
4e383037 1135 imo = fPyjets->K[2][i];
1136 if (imo > 1000) {
1137 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1138 }
0f482ae4 1139 }
4e383037 1140// this->Pylist(1);
0f482ae4 1141} // end quench
90d7b703 1142
992f2843 1143
1144void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1145{
1146 // Igor Lokthine's quenching routine
1147 pyquen(a, ibf, b);
1148}
b280c4cc 1149
16a82508 1150void AliPythia::Pyevnw()
1151{
1152 // New multiple interaction scenario
1153 pyevnw();
1154}
1155
b280c4cc 1156void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1157{
1158 // Return event specific quenching parameters
1159 xp = fXJet;
1160 yp = fYJet;
1161 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1162
1163}
1164
3dc3ec94 1165void AliPythia::ConfigHeavyFlavor()
1166{
1167 //
1168 // Default configuration for Heavy Flavor production
1169 //
1170 // All QCD processes
1171 //
1172 SetMSEL(1);
1173
1174 // No multiple interactions
1175 SetMSTP(81,0);
3dc3ec94 1176 // Initial/final parton shower on (Pythia default)
1177 SetMSTP(61,1);
1178 SetMSTP(71,1);
1179
1180 // 2nd order alpha_s
1181 SetMSTP(2,2);
1182
1183 // QCD scales
1184 SetMSTP(32,2);
1185 SetPARP(34,1.0);
1186}
e0e89f40 1187
1188void AliPythia::AtlasTuning()
1189{
1190 //
1191 // Configuration for the ATLAS tuning
1192 SetMSTP(51, kCTEQ5L); // CTEQ5L pdf
1193 SetMSTP(81,1); // Multiple Interactions ON
1194 SetMSTP(82,4); // Double Gaussian Model
1195 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1196 SetPARP(89,1000.); // [GeV] Ref. energy
1197 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1198 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1199 SetPARP(84,0.5); // Core radius
1200 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1201 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1202 SetPARP(67,1); // Regulates Initial State Radiation
1203}