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Shadowing of variables corrected.
[u/mrichter/AliRoot.git] / PYTHIA6 / AliPythia.cxx
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6b435cde 1
8d2cd130 2/**************************************************************************
3 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
4 * *
5 * Author: The ALICE Off-line Project. *
6 * Contributors are mentioned in the code where appropriate. *
7 * *
8 * Permission to use, copy, modify and distribute this software and its *
9 * documentation strictly for non-commercial purposes is hereby granted *
10 * without fee, provided that the above copyright notice appears in all *
11 * copies and that both the copyright notice and this permission notice *
12 * appear in the supporting documentation. The authors make no claims *
13 * about the suitability of this software for any purpose. It is *
14 * provided "as is" without express or implied warranty. *
15 **************************************************************************/
16
7cdba479 17/* $Id$ */
8d2cd130 18
19#include "AliPythia.h"
7cdba479 20#include "AliPythiaRndm.h"
12cb0bc0 21#include "AliFastGlauber.h"
22#include "AliQuenchingWeights.h"
0f482ae4 23#include "TVector3.h"
12cb0bc0 24#include "PyquenCommon.h"
8d2cd130 25
26ClassImp(AliPythia)
27
28#ifndef WIN32
29# define pyclus pyclus_
30# define pycell pycell_
452af8c7 31# define pyshow pyshow_
32# define pyrobo pyrobo_
992f2843 33# define pyquen pyquen_
16a82508 34# define pyevnw pyevnw_
8d2cd130 35# define type_of_call
36#else
37# define pyclus PYCLUS
38# define pycell PYCELL
452af8c7 39# define pyrobo PYROBO
992f2843 40# define pyquen PYQUEN
16a82508 41# define pyevnw PYEVNW
8d2cd130 42# define type_of_call _stdcall
43#endif
44
45extern "C" void type_of_call pyclus(Int_t & );
46extern "C" void type_of_call pycell(Int_t & );
452af8c7 47extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
48extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
992f2843 49extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
0a2cfc0a 50extern "C" void type_of_call pyevnw(){;}
8d2cd130 51
52//_____________________________________________________________________________
53
54AliPythia* AliPythia::fgAliPythia=NULL;
55
e8a8adcd 56AliPythia::AliPythia():
57 fProcess(kPyMb),
58 fEcms(0.),
59 fStrucFunc(kCTEQ5L),
60 fXJet(0.),
61 fYJet(0.),
32c8e463 62 fNGmax(30),
63 fZmax(0.97),
e8a8adcd 64 fGlauber(0),
65 fQuenchingWeights(0)
8d2cd130 66{
67// Default Constructor
68//
69// Set random number
7cdba479 70 if (!AliPythiaRndm::GetPythiaRandom())
71 AliPythiaRndm::SetPythiaRandom(GetRandom());
0f482ae4 72 fGlauber = 0;
73 fQuenchingWeights = 0;
8d2cd130 74}
75
e8a8adcd 76AliPythia::AliPythia(const AliPythia& pythia):
6b435cde 77 TPythia6(pythia),
78 AliRndm(pythia),
e8a8adcd 79 fProcess(kPyMb),
80 fEcms(0.),
81 fStrucFunc(kCTEQ5L),
82 fXJet(0.),
83 fYJet(0.),
32c8e463 84 fNGmax(30),
85 fZmax(0.97),
e8a8adcd 86 fGlauber(0),
87 fQuenchingWeights(0)
88{
89 // Copy Constructor
90 pythia.Copy(*this);
91}
92
8d2cd130 93void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc)
94{
95// Initialise the process to generate
7cdba479 96 if (!AliPythiaRndm::GetPythiaRandom())
97 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 98
99 fProcess = process;
100 fEcms = energy;
101 fStrucFunc = strucfunc;
1d5b1b20 102//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
e2de0ce1 103 SetMDCY(Pycomp(111) ,1,0); // pi0
104 SetMDCY(Pycomp(310) ,1,0); // K0S
105 SetMDCY(Pycomp(3122),1,0); // kLambda
106 SetMDCY(Pycomp(3112),1,0); // sigma -
107 SetMDCY(Pycomp(3212),1,0); // sigma 0
108 SetMDCY(Pycomp(3222),1,0); // sigma +
109 SetMDCY(Pycomp(3312),1,0); // xi -
110 SetMDCY(Pycomp(3322),1,0); // xi 0
111 SetMDCY(Pycomp(3334),1,0); // omega-
1c50ec12 112 // Select structure function
8d2cd130 113 SetMSTP(52,2);
e2de0ce1 114 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
1c50ec12 115 // Particles produced in string fragmentation point directly to either of the two endpoints
116 // of the string (depending in the side they were generated from).
117 SetMSTU(16,2);
118
8d2cd130 119//
120// Pythia initialisation for selected processes//
121//
122// Make MSEL clean
123//
124 for (Int_t i=1; i<= 200; i++) {
125 SetMSUB(i,0);
126 }
127// select charm production
128 switch (process)
129 {
65f2626c 130 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
131// Multiple interactions on.
132 SetMSTP(81,1);
133// Double Gaussian matter distribution.
134 SetMSTP(82,4);
135 SetPARP(83,0.5);
136 SetPARP(84,0.4);
137// pT0.
138 SetPARP(82,2.0);
139// Reference energy for pT0 and energy rescaling pace.
140 SetPARP(89,1800);
141 SetPARP(90,0.25);
142// String drawing almost completely minimizes string length.
143 SetPARP(85,0.9);
144 SetPARP(86,0.95);
145// ISR and FSR activity.
146 SetPARP(67,4);
147 SetPARP(71,4);
148// Lambda_FSR scale.
149 SetPARJ(81,0.29);
150 break;
151 case kPyOldUEQ2ordered2:
152// Old underlying events with Q2 ordered QCD processes
153// Multiple interactions on.
154 SetMSTP(81,1);
155// Double Gaussian matter distribution.
156 SetMSTP(82,4);
157 SetPARP(83,0.5);
158 SetPARP(84,0.4);
159// pT0.
160 SetPARP(82,2.0);
161// Reference energy for pT0 and energy rescaling pace.
162 SetPARP(89,1800);
163 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
164// String drawing almost completely minimizes string length.
165 SetPARP(85,0.9);
166 SetPARP(86,0.95);
167// ISR and FSR activity.
168 SetPARP(67,4);
169 SetPARP(71,4);
170// Lambda_FSR scale.
171 SetPARJ(81,0.29);
172 break;
173 case kPyOldPopcorn:
174// Old production mechanism: Old Popcorn
175 SetMSEL(1);
176 SetMSTJ(12,3);
177// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
178 SetMSTP(88,2);
179// (D=1)see can be used to form baryons (BARYON JUNCTION)
180 SetMSTJ(1,1);
e0e89f40 181 AtlasTuning();
65f2626c 182 break;
8d2cd130 183 case kPyCharm:
184 SetMSEL(4);
8d2cd130 185// heavy quark masses
186
187 SetPMAS(4,1,1.2);
8d2cd130 188//
189// primordial pT
190 SetMSTP(91,1);
191 SetPARP(91,1.);
192 SetPARP(93,5.);
193//
194 break;
195 case kPyBeauty:
196 SetMSEL(5);
197 SetPMAS(5,1,4.75);
8d2cd130 198 break;
199 case kPyJpsi:
200 SetMSEL(0);
201// gg->J/Psi g
202 SetMSUB(86,1);
203 break;
204 case kPyJpsiChi:
205 SetMSEL(0);
206// gg->J/Psi g
207 SetMSUB(86,1);
208// gg-> chi_0c g
209 SetMSUB(87,1);
210// gg-> chi_1c g
211 SetMSUB(88,1);
212// gg-> chi_2c g
213 SetMSUB(89,1);
214 break;
215 case kPyCharmUnforced:
216 SetMSEL(0);
217// gq->qg
218 SetMSUB(28,1);
219// gg->qq
220 SetMSUB(53,1);
221// gg->gg
222 SetMSUB(68,1);
223 break;
224 case kPyBeautyUnforced:
225 SetMSEL(0);
226// gq->qg
227 SetMSUB(28,1);
228// gg->qq
229 SetMSUB(53,1);
230// gg->gg
231 SetMSUB(68,1);
232 break;
233 case kPyMb:
234// Minimum Bias pp-Collisions
235//
236//
237// select Pythia min. bias model
238 SetMSEL(0);
511db649 239 SetMSUB(92,1); // single diffraction AB-->XB
240 SetMSUB(93,1); // single diffraction AB-->AX
241 SetMSUB(94,1); // double diffraction
242 SetMSUB(95,1); // low pt production
243
e0e89f40 244 AtlasTuning();
f529e69b 245 break;
246 case kPyMbDefault:
247// Minimum Bias pp-Collisions
248//
249//
250// select Pythia min. bias model
251 SetMSEL(0);
252 SetMSUB(92,1); // single diffraction AB-->XB
253 SetMSUB(93,1); // single diffraction AB-->AX
254 SetMSUB(94,1); // double diffraction
255 SetMSUB(95,1); // low pt production
256
0a0cbcfd 257 break;
258 case kPyLhwgMb:
259// Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
260// -> Pythia 6.3 or above is needed
261//
262 SetMSEL(0);
263 SetMSUB(92,1); // single diffraction AB-->XB
264 SetMSUB(93,1); // single diffraction AB-->AX
265 SetMSUB(94,1); // double diffraction
266 SetMSUB(95,1); // low pt production
267
e2de0ce1 268 SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
0a0cbcfd 269 SetMSTP(52,2);
270 SetMSTP(68,1);
271 SetMSTP(70,2);
272 SetMSTP(81,1); // Multiple Interactions ON
273 SetMSTP(82,4); // Double Gaussian Model
274 SetMSTP(88,1);
275
276 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
277 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
278 SetPARP(84,0.5); // Core radius
279 SetPARP(85,0.9); // Regulates gluon prod. mechanism
280 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
281
511db649 282 break;
8d2cd130 283 case kPyMbNonDiffr:
284// Minimum Bias pp-Collisions
285//
286//
287// select Pythia min. bias model
288 SetMSEL(0);
511db649 289 SetMSUB(95,1); // low pt production
0f482ae4 290
d7de4a67 291 AtlasTuning();
292 break;
293 case kPyMbMSEL1:
294 ConfigHeavyFlavor();
295// Intrinsic <kT^2>
296 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
297 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
298 SetPARP(93,5.); // Upper cut-off
299// Set Q-quark mass
300 SetPMAS(4,1,1.2); // Charm quark mass
301 SetPMAS(5,1,4.78); // Beauty quark mass
302 SetPARP(71,4.); // Defaut value
303// Atlas Tuning
e0e89f40 304 AtlasTuning();
8d2cd130 305 break;
306 case kPyJets:
307//
308// QCD Jets
309//
310 SetMSEL(1);
65f2626c 311 // Pythia Tune A (CDF)
312 //
4167b79f 313 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
65f2626c 314 SetMSTP(82,4); // Double Gaussian Model
315 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
316 SetPARP(84,0.4); // Core radius
317 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
318 SetPARP(86,0.95); // Regulates gluon prod. mechanism
319 SetPARP(89,1800.); // [GeV] Ref. energy
320 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
321 break;
8d2cd130 322 case kPyDirectGamma:
323 SetMSEL(10);
324 break;
adf4d898 325 case kPyCharmPbPbMNR:
326 case kPyD0PbPbMNR:
90d7b703 327 case kPyDPlusPbPbMNR:
e0e89f40 328 case kPyDPlusStrangePbPbMNR:
90d7b703 329 // Tuning of Pythia parameters aimed to get a resonable agreement
330 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
331 // c-cbar single inclusive and double differential distributions.
332 // This parameter settings are meant to work with Pb-Pb collisions
333 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
334 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
335 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 336 ConfigHeavyFlavor();
90d7b703 337 // Intrinsic <kT>
338 SetMSTP(91,1);
339 SetPARP(91,1.304);
340 SetPARP(93,6.52);
90d7b703 341 // Set c-quark mass
342 SetPMAS(4,1,1.2);
8d2cd130 343 break;
adf4d898 344 case kPyCharmpPbMNR:
345 case kPyD0pPbMNR:
90d7b703 346 case kPyDPluspPbMNR:
e0e89f40 347 case kPyDPlusStrangepPbMNR:
90d7b703 348 // Tuning of Pythia parameters aimed to get a resonable agreement
349 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
350 // c-cbar single inclusive and double differential distributions.
351 // This parameter settings are meant to work with p-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 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 355 ConfigHeavyFlavor();
90d7b703 356 // Intrinsic <kT>
3dc3ec94 357 SetMSTP(91,1);
358 SetPARP(91,1.16);
359 SetPARP(93,5.8);
360
90d7b703 361 // Set c-quark mass
3dc3ec94 362 SetPMAS(4,1,1.2);
adf4d898 363 break;
364 case kPyCharmppMNR:
365 case kPyD0ppMNR:
90d7b703 366 case kPyDPlusppMNR:
e0e89f40 367 case kPyDPlusStrangeppMNR:
90d7b703 368 // Tuning of Pythia parameters aimed to get a resonable agreement
369 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
370 // c-cbar single inclusive and double differential distributions.
371 // This parameter settings are meant to work with pp collisions
372 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
373 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
374 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 375 ConfigHeavyFlavor();
90d7b703 376 // Intrinsic <kT^2>
3dc3ec94 377 SetMSTP(91,1);
378 SetPARP(91,1.);
379 SetPARP(93,5.);
380
90d7b703 381 // Set c-quark mass
3dc3ec94 382 SetPMAS(4,1,1.2);
adf4d898 383 break;
e0e89f40 384 case kPyCharmppMNRwmi:
385 // Tuning of Pythia parameters aimed to get a resonable agreement
386 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
387 // c-cbar single inclusive and double differential distributions.
388 // This parameter settings are meant to work with pp collisions
389 // and with kCTEQ5L PDFs.
390 // Added multiple interactions according to ATLAS tune settings.
391 // To get a "reasonable" agreement with MNR results, events have to be
392 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
393 // set to 2.76 GeV.
394 // To get a "perfect" agreement with MNR results, events have to be
395 // generated in four ptHard bins with the following relative
396 // normalizations:
397 // 2.76-3 GeV: 25%
398 // 3-4 GeV: 40%
399 // 4-8 GeV: 29%
400 // >8 GeV: 6%
401 ConfigHeavyFlavor();
402 // Intrinsic <kT^2>
403 SetMSTP(91,1);
404 SetPARP(91,1.);
405 SetPARP(93,5.);
406
407 // Set c-quark mass
408 SetPMAS(4,1,1.2);
409 AtlasTuning();
410 break;
adf4d898 411 case kPyBeautyPbPbMNR:
8d2cd130 412 // Tuning of Pythia parameters aimed to get a resonable agreement
413 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
414 // b-bbar single inclusive and double differential distributions.
415 // This parameter settings are meant to work with Pb-Pb collisions
416 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
417 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
418 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 419 ConfigHeavyFlavor();
8d2cd130 420 // QCD scales
3dc3ec94 421 SetPARP(67,1.0);
422 SetPARP(71,1.0);
adf4d898 423 // Intrinsic <kT>
3dc3ec94 424 SetMSTP(91,1);
425 SetPARP(91,2.035);
426 SetPARP(93,10.17);
8d2cd130 427 // Set b-quark mass
3dc3ec94 428 SetPMAS(5,1,4.75);
adf4d898 429 break;
430 case kPyBeautypPbMNR:
431 // Tuning of Pythia parameters aimed to get a resonable agreement
432 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
433 // b-bbar single inclusive and double differential distributions.
434 // This parameter settings are meant to work with p-Pb collisions
435 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
436 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
437 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 438 ConfigHeavyFlavor();
adf4d898 439 // QCD scales
3dc3ec94 440 SetPARP(67,1.0);
441 SetPARP(71,1.0);
adf4d898 442 // Intrinsic <kT>
3dc3ec94 443 SetMSTP(91,1);
444 SetPARP(91,1.60);
445 SetPARP(93,8.00);
adf4d898 446 // Set b-quark mass
3dc3ec94 447 SetPMAS(5,1,4.75);
adf4d898 448 break;
449 case kPyBeautyppMNR:
450 // Tuning of Pythia parameters aimed to get a resonable agreement
451 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
452 // b-bbar single inclusive and double differential distributions.
453 // This parameter settings are meant to work with pp collisions
454 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
455 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
456 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 457 ConfigHeavyFlavor();
adf4d898 458 // QCD scales
3dc3ec94 459 SetPARP(67,1.0);
460 SetPARP(71,1.0);
461
462 // Intrinsic <kT>
463 SetMSTP(91,1);
464 SetPARP(91,1.);
465 SetPARP(93,5.);
466
467 // Set b-quark mass
468 SetPMAS(5,1,4.75);
8d2cd130 469 break;
e0e89f40 470 case kPyBeautyppMNRwmi:
471 // Tuning of Pythia parameters aimed to get a resonable agreement
472 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
473 // b-bbar single inclusive and double differential distributions.
474 // This parameter settings are meant to work with pp collisions
475 // and with kCTEQ5L PDFs.
476 // Added multiple interactions according to ATLAS tune settings.
477 // To get a "reasonable" agreement with MNR results, events have to be
478 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
479 // set to 2.76 GeV.
480 // To get a "perfect" agreement with MNR results, events have to be
481 // generated in four ptHard bins with the following relative
482 // normalizations:
483 // 2.76-4 GeV: 5%
484 // 4-6 GeV: 31%
485 // 6-8 GeV: 28%
486 // >8 GeV: 36%
487 ConfigHeavyFlavor();
488 // QCD scales
489 SetPARP(67,1.0);
490 SetPARP(71,1.0);
491
492 // Intrinsic <kT>
493 SetMSTP(91,1);
494 SetPARP(91,1.);
495 SetPARP(93,5.);
496
497 // Set b-quark mass
498 SetPMAS(5,1,4.75);
499
500 AtlasTuning();
501 break;
589380c6 502 case kPyW:
503
504 //Inclusive production of W+/-
505 SetMSEL(0);
506 //f fbar -> W+
507 SetMSUB(2,1);
508 // //f fbar -> g W+
509 // SetMSUB(16,1);
510 // //f fbar -> gamma W+
511 // SetMSUB(20,1);
512 // //f g -> f W+
513 // SetMSUB(31,1);
514 // //f gamma -> f W+
515 // SetMSUB(36,1);
516
517 // Initial/final parton shower on (Pythia default)
518 // With parton showers on we are generating "W inclusive process"
519 SetMSTP(61,1); //Initial QCD & QED showers on
520 SetMSTP(71,1); //Final QCD & QED showers on
521
522 break;
0f6ee828 523
524 case kPyZ:
525
526 //Inclusive production of Z
527 SetMSEL(0);
528 //f fbar -> Z/gamma
529 SetMSUB(1,1);
530
531 // // f fbar -> g Z/gamma
532 // SetMSUB(15,1);
533 // // f fbar -> gamma Z/gamma
534 // SetMSUB(19,1);
535 // // f g -> f Z/gamma
536 // SetMSUB(30,1);
537 // // f gamma -> f Z/gamma
538 // SetMSUB(35,1);
539
540 //only Z included, not gamma
541 SetMSTP(43,2);
542
543 // Initial/final parton shower on (Pythia default)
544 // With parton showers on we are generating "Z inclusive process"
545 SetMSTP(61,1); //Initial QCD & QED showers on
546 SetMSTP(71,1); //Final QCD & QED showers on
547
548 break;
549
8d2cd130 550 }
551//
552// Initialize PYTHIA
553 SetMSTP(41,1); // all resonance decays switched on
8d2cd130 554 Initialize("CMS","p","p",fEcms);
4167b79f 555
8d2cd130 556}
557
558Int_t AliPythia::CheckedLuComp(Int_t kf)
559{
560// Check Lund particle code (for debugging)
561 Int_t kc=Pycomp(kf);
562 printf("\n Lucomp kf,kc %d %d",kf,kc);
563 return kc;
564}
565
566void AliPythia::SetNuclei(Int_t a1, Int_t a2)
567{
568// Treat protons as inside nuclei with mass numbers a1 and a2
569// The MSTP array in the PYPARS common block is used to enable and
570// select the nuclear structure functions.
571// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
572// =1: internal PYTHIA acording to MSTP(51)
573// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
574// If the following mass number both not equal zero, nuclear corrections of the stf are used.
575// MSTP(192) : Mass number of nucleus side 1
576// MSTP(193) : Mass number of nucleus side 2
577 SetMSTP(52,2);
578 SetMSTP(192, a1);
579 SetMSTP(193, a2);
580}
581
582
583AliPythia* AliPythia::Instance()
584{
585// Set random number generator
586 if (fgAliPythia) {
587 return fgAliPythia;
588 } else {
589 fgAliPythia = new AliPythia();
590 return fgAliPythia;
591 }
592}
593
594void AliPythia::PrintParticles()
595{
596// Print list of particl properties
597 Int_t np = 0;
c31f1d37 598 char* name = new char[16];
8d2cd130 599 for (Int_t kf=0; kf<1000000; kf++) {
600 for (Int_t c = 1; c > -2; c-=2) {
8d2cd130 601 Int_t kc = Pycomp(c*kf);
602 if (kc) {
603 Float_t mass = GetPMAS(kc,1);
604 Float_t width = GetPMAS(kc,2);
605 Float_t tau = GetPMAS(kc,4);
c31f1d37 606
8d2cd130 607 Pyname(kf,name);
608
609 np++;
610
611 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
612 c*kf, name, mass, width, tau);
613 }
614 }
615 }
616 printf("\n Number of particles %d \n \n", np);
617}
618
619void AliPythia::ResetDecayTable()
620{
621// Set default values for pythia decay switches
622 Int_t i;
623 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
624 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
625}
626
627void AliPythia::SetDecayTable()
628{
629// Set default values for pythia decay switches
630//
631 Int_t i;
632 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
633 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
634}
635
636void AliPythia::Pyclus(Int_t& njet)
637{
638// Call Pythia clustering algorithm
639//
640 pyclus(njet);
641}
642
643void AliPythia::Pycell(Int_t& njet)
644{
645// Call Pythia jet reconstruction algorithm
646//
647 pycell(njet);
648}
649
452af8c7 650void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
651{
652// Call Pythia jet reconstruction algorithm
653//
452af8c7 654 pyshow(ip1, ip2, qmax);
655}
656
657void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
658{
659 pyrobo(imi, ima, the, phi, bex, bey, bez);
660}
661
662
663
32c8e463 664void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
0f482ae4 665{
666// Initializes
667// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
668// (2) The nuclear geometry using the Glauber Model
669//
6b435cde 670
0f482ae4 671 fGlauber = new AliFastGlauber();
672 fGlauber->Init(2);
673 fGlauber->SetCentralityClass(cMin, cMax);
674
675 fQuenchingWeights = new AliQuenchingWeights();
676 fQuenchingWeights->InitMult();
86b6ad68 677 fQuenchingWeights->SetK(k);
0f482ae4 678 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
32c8e463 679 fNGmax = ngmax;
680 fZmax = zmax;
681
0f482ae4 682}
683
684
452af8c7 685void AliPythia::Quench()
686{
687//
688//
689// Simple Jet Quenching routine:
690// =============================
691// The jet formed by all final state partons radiated by the parton created
0f482ae4 692// in the hard collisions is quenched by a factor (1-z) using light cone variables in
693// the initial parton reference frame:
452af8c7 694// (E + p_z)new = (1-z) (E + p_z)old
695//
0f482ae4 696//
697//
698//
452af8c7 699// The lost momentum is first balanced by one gluon with virtuality > 0.
700// Subsequently the gluon splits to yield two gluons with E = p.
701//
0f482ae4 702//
703//
4e383037 704 static Float_t eMean = 0.;
705 static Int_t icall = 0;
0f482ae4 706
c2c598a3 707 Double_t p0[4][5];
708 Double_t p1[4][5];
709 Double_t p2[4][5];
710 Int_t klast[4] = {-1, -1, -1, -1};
452af8c7 711
712 Int_t numpart = fPyjets->N;
86b6ad68 713 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
c2c598a3 714 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
715 Bool_t quenched[4];
b280c4cc 716 Double_t wjtKick[4];
c2c598a3 717 Int_t nGluon[4];
86b6ad68 718 Int_t qPdg[4];
0f482ae4 719 Int_t imo, kst, pdg;
b280c4cc 720
511db649 721//
c2c598a3 722// Sore information about Primary partons
723//
724// j =
725// 0, 1 partons from hard scattering
726// 2, 3 partons from initial state radiation
727//
728 for (Int_t i = 2; i <= 7; i++) {
729 Int_t j = 0;
730 // Skip gluons that participate in hard scattering
731 if (i == 4 || i == 5) continue;
732 // Gluons from hard Scattering
733 if (i == 6 || i == 7) {
734 j = i - 6;
735 pxq[j] = fPyjets->P[0][i];
736 pyq[j] = fPyjets->P[1][i];
737 pzq[j] = fPyjets->P[2][i];
738 eq[j] = fPyjets->P[3][i];
739 mq[j] = fPyjets->P[4][i];
740 } else {
741 // Gluons from initial state radiation
742 //
743 // Obtain 4-momentum vector from difference between original parton and parton after gluon
744 // radiation. Energy is calculated independently because initial state radition does not
745 // conserve strictly momentum and energy for each partonic system independently.
746 //
747 // Not very clean. Should be improved !
748 //
749 //
750 j = i;
751 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
752 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
753 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
754 mq[j] = fPyjets->P[4][i];
755 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
756 }
757//
758// Calculate some kinematic variables
511db649 759//
4e383037 760 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
0f482ae4 761 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
762 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
763 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
764 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
86b6ad68 765 qPdg[j] = fPyjets->K[1][i];
766 }
767
768 Double_t int0[4];
769 Double_t int1[4];
86b6ad68 770
b280c4cc 771 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
772
86b6ad68 773 for (Int_t j = 0; j < 4; j++) {
c2c598a3 774 //
775 // Quench only central jets and with E > 10.
776 //
86b6ad68 777
778
779 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
780 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
781
c2c598a3 782 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
b280c4cc 783 fZQuench[j] = 0.;
0f482ae4 784 } else {
c2c598a3 785 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
4e383037 786 icall ++;
787 eMean += eloss;
788 }
0f482ae4 789 //
790 // Extra pt
86b6ad68 791 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
792 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
0f482ae4 793 //
794 // Fractional energy loss
b280c4cc 795 fZQuench[j] = eloss / eq[j];
0f482ae4 796 //
797 // Avoid complete loss
798 //
32c8e463 799 if (fZQuench[j] == 1.) fZQuench[j] = fZmax;
0f482ae4 800 //
801 // Some debug printing
86b6ad68 802
803
bf9bb016 804// 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",
805// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
4e383037 806
b280c4cc 807// fZQuench[j] = 0.8;
808// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
0f482ae4 809 }
4e383037 810
b280c4cc 811 quenched[j] = (fZQuench[j] > 0.01);
4e383037 812 } // primary partons
c2c598a3 813
b280c4cc 814
815
6e90ad26 816 Double_t pNew[1000][4];
817 Int_t kNew[1000];
818 Int_t icount = 0;
b280c4cc 819 Double_t zquench[4];
820
6e90ad26 821//
4e383037 822// System Loop
c2c598a3 823 for (Int_t isys = 0; isys < 4; isys++) {
6e90ad26 824// Skip to next system if not quenched.
4e383037 825 if (!quenched[isys]) continue;
826
b280c4cc 827 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
32c8e463 828 if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
b280c4cc 829 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
4e383037 830 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
0f482ae4 831
4e383037 832
833
834 Int_t igMin = -1;
835 Int_t igMax = -1;
836 Double_t pg[4] = {0., 0., 0., 0.};
837
838//
839// Loop on radiation events
840
841 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
6e90ad26 842 while (1) {
843 icount = 0;
844 for (Int_t k = 0; k < 4; k++)
845 {
846 p0[isys][k] = 0.;
847 p1[isys][k] = 0.;
848 p2[isys][k] = 0.;
849 }
850// Loop over partons
851 for (Int_t i = 0; i < numpart; i++)
852 {
853 imo = fPyjets->K[2][i];
854 kst = fPyjets->K[0][i];
855 pdg = fPyjets->K[1][i];
856
857
858
0f482ae4 859// Quarks and gluons only
6e90ad26 860 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
0f482ae4 861// Particles from hard scattering only
c2c598a3 862
6e90ad26 863 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
c2c598a3 864 Int_t imom = imo % 1000;
865 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
866 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
867
6e90ad26 868
0f482ae4 869// Skip comment lines
6e90ad26 870 if (kst != 1 && kst != 2) continue;
0f482ae4 871//
872// Parton kinematic
6e90ad26 873 px = fPyjets->P[0][i];
874 py = fPyjets->P[1][i];
875 pz = fPyjets->P[2][i];
876 e = fPyjets->P[3][i];
877 m = fPyjets->P[4][i];
878 pt = TMath::Sqrt(px * px + py * py);
879 p = TMath::Sqrt(px * px + py * py + pz * pz);
880 phi = TMath::Pi() + TMath::ATan2(-py, -px);
881 theta = TMath::ATan2(pt, pz);
882
0f482ae4 883//
c2c598a3 884// Save 4-momentum sum for balancing
885 Int_t index = isys;
6e90ad26 886
887 p0[index][0] += px;
888 p0[index][1] += py;
889 p0[index][2] += pz;
890 p0[index][3] += e;
6e90ad26 891
892 klast[index] = i;
893
0f482ae4 894//
895// Fractional energy loss
b280c4cc 896 Double_t z = zquench[index];
4e383037 897
c2c598a3 898
4e383037 899// Don't fully quench radiated gluons
900//
901 if (imo > 1000) {
902// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
903//
904
c2c598a3 905 z = 0.02;
4e383037 906 }
c2c598a3 907// printf("z: %d %f\n", imo, z);
908
4e383037 909
910//
6e90ad26 911
912 //
913 //
914 // Transform into frame in which initial parton is along z-axis
915 //
916 TVector3 v(px, py, pz);
917 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
918 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
919
920 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
921 Double_t mt2 = jt * jt + m * m;
922 Double_t zmax = 1.;
923 //
924 // Kinematic limit on z
925 //
4e383037 926 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
6e90ad26 927 //
928 // Change light-cone kinematics rel. to initial parton
929 //
930 Double_t eppzOld = e + pl;
931 Double_t empzOld = e - pl;
932
933 Double_t eppzNew = (1. - z) * eppzOld;
934 Double_t empzNew = empzOld - mt2 * z / eppzOld;
935 Double_t eNew = 0.5 * (eppzNew + empzNew);
936 Double_t plNew = 0.5 * (eppzNew - empzNew);
937
938 Double_t jtNew;
939 //
940 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
941 Double_t mt2New = eppzNew * empzNew;
942 if (mt2New < 1.e-8) mt2New = 0.;
4e383037 943 if (z < zmax) {
944 if (m * m > mt2New) {
945 //
946 // This should not happen
947 //
948 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
949 jtNew = 0;
950 } else {
951 jtNew = TMath::Sqrt(mt2New - m * m);
952 }
6e90ad26 953 } else {
4e383037 954 // If pT is to small (probably a leading massive particle) we scale only the energy
955 // This can cause negative masses of the radiated gluon
956 // Let's hope for the best ...
957 jtNew = jt;
958 eNew = TMath::Sqrt(plNew * plNew + mt2);
959
6e90ad26 960 }
6e90ad26 961 //
962 // Calculate new px, py
963 //
b07be423 964 Double_t pxNew = 0;
965 Double_t pyNew = 0;
6e90ad26 966
b07be423 967 if (jt>0) {
6b118b3c 968 pxNew = jtNew / jt * pxs;
969 pyNew = jtNew / jt * pys;
b07be423 970 }
6e90ad26 971// Double_t dpx = pxs - pxNew;
972// Double_t dpy = pys - pyNew;
973// Double_t dpz = pl - plNew;
974// Double_t de = e - eNew;
975// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
976// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
977// printf("New mass (2) %e %e \n", pxNew, pyNew);
978 //
979 // Rotate back
980 //
981 TVector3 w(pxNew, pyNew, plNew);
982 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
983 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
984
985 p1[index][0] += pxNew;
986 p1[index][1] += pyNew;
987 p1[index][2] += plNew;
988 p1[index][3] += eNew;
989 //
990 // Updated 4-momentum vectors
991 //
992 pNew[icount][0] = pxNew;
993 pNew[icount][1] = pyNew;
994 pNew[icount][2] = plNew;
995 pNew[icount][3] = eNew;
996 kNew[icount] = i;
997 icount++;
998 } // parton loop
0f482ae4 999 //
6e90ad26 1000 // Check if there was phase-space for quenching
0f482ae4 1001 //
0f482ae4 1002
6e90ad26 1003 if (icount == 0) quenched[isys] = kFALSE;
1004 if (!quenched[isys]) break;
1005
1006 for (Int_t j = 0; j < 4; j++)
1007 {
1008 p2[isys][j] = p0[isys][j] - p1[isys][j];
1009 }
1010 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 1011 if (p2[isys][4] > 0.) {
1012 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1013 break;
1014 } else {
b280c4cc 1015 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
4e383037 1016 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 1017 if (p2[isys][4] < -0.01) {
4e383037 1018 printf("Negative mass squared !\n");
1019 // Here we have to put the gluon back to mass shell
1020 // This will lead to a small energy imbalance
1021 p2[isys][4] = 0.;
1022 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1023 break;
6e90ad26 1024 } else {
1025 p2[isys][4] = 0.;
1026 break;
1027 }
1028 }
6e90ad26 1029 /*
6e90ad26 1030 zHeavy *= 0.98;
1031 printf("zHeavy lowered to %f\n", zHeavy);
1032 if (zHeavy < 0.01) {
1033 printf("No success ! \n");
1034 icount = 0;
1035 quenched[isys] = kFALSE;
1036 break;
1037 }
4e383037 1038 */
1039 } // iteration on z (while)
1040
6e90ad26 1041// Update event record
1042 for (Int_t k = 0; k < icount; k++) {
1043// 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] );
1044 fPyjets->P[0][kNew[k]] = pNew[k][0];
1045 fPyjets->P[1][kNew[k]] = pNew[k][1];
1046 fPyjets->P[2][kNew[k]] = pNew[k][2];
1047 fPyjets->P[3][kNew[k]] = pNew[k][3];
0f482ae4 1048 }
4e383037 1049 //
1050 // Add the gluons
1051 //
1052 Int_t ish = 0;
1837e95c 1053 Int_t iGlu;
4e383037 1054 if (!quenched[isys]) continue;
0f482ae4 1055//
1056// Last parton from shower i
4e383037 1057 Int_t in = klast[isys];
0f482ae4 1058//
1059// Continue if no parton in shower i selected
1060 if (in == -1) continue;
1061//
1062// If this is the second initial parton and it is behind the first move pointer by previous ish
4e383037 1063 if (isys == 1 && klast[1] > klast[0]) in += ish;
0f482ae4 1064//
1065// Starting index
452af8c7 1066
4e383037 1067// jmin = in - 1;
0f482ae4 1068// How many additional gluons will be generated
1069 ish = 1;
4e383037 1070 if (p2[isys][4] > 0.05) ish = 2;
0f482ae4 1071//
1072// Position of gluons
4e383037 1073 iGlu = numpart;
1074 if (iglu == 0) igMin = iGlu;
1075 igMax = iGlu;
0f482ae4 1076 numpart += ish;
1077 (fPyjets->N) += ish;
4e383037 1078
0f482ae4 1079 if (ish == 1) {
4e383037 1080 fPyjets->P[0][iGlu] = p2[isys][0];
1081 fPyjets->P[1][iGlu] = p2[isys][1];
1082 fPyjets->P[2][iGlu] = p2[isys][2];
1083 fPyjets->P[3][iGlu] = p2[isys][3];
1084 fPyjets->P[4][iGlu] = p2[isys][4];
0f482ae4 1085
4e383037 1086 fPyjets->K[0][iGlu] = 1;
1087 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
0f482ae4 1088 fPyjets->K[1][iGlu] = 21;
4e383037 1089 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1090 fPyjets->K[3][iGlu] = -1;
1091 fPyjets->K[4][iGlu] = -1;
4e383037 1092
1093 pg[0] += p2[isys][0];
1094 pg[1] += p2[isys][1];
1095 pg[2] += p2[isys][2];
1096 pg[3] += p2[isys][3];
0f482ae4 1097 } else {
1098 //
1099 // Split gluon in rest frame.
1100 //
4e383037 1101 Double_t bx = p2[isys][0] / p2[isys][3];
1102 Double_t by = p2[isys][1] / p2[isys][3];
1103 Double_t bz = p2[isys][2] / p2[isys][3];
1104 Double_t pst = p2[isys][4] / 2.;
0f482ae4 1105 //
1106 // Isotropic decay ????
1107 Double_t cost = 2. * gRandom->Rndm() - 1.;
1108 Double_t sint = TMath::Sqrt(1. - cost * cost);
2ab330c9 1109 Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
0f482ae4 1110
1111 Double_t pz1 = pst * cost;
1112 Double_t pz2 = -pst * cost;
1113 Double_t pt1 = pst * sint;
1114 Double_t pt2 = -pst * sint;
2ab330c9 1115 Double_t px1 = pt1 * TMath::Cos(phis);
1116 Double_t py1 = pt1 * TMath::Sin(phis);
1117 Double_t px2 = pt2 * TMath::Cos(phis);
1118 Double_t py2 = pt2 * TMath::Sin(phis);
0f482ae4 1119
1120 fPyjets->P[0][iGlu] = px1;
1121 fPyjets->P[1][iGlu] = py1;
1122 fPyjets->P[2][iGlu] = pz1;
1123 fPyjets->P[3][iGlu] = pst;
1124 fPyjets->P[4][iGlu] = 0.;
1125
4e383037 1126 fPyjets->K[0][iGlu] = 1 ;
0f482ae4 1127 fPyjets->K[1][iGlu] = 21;
4e383037 1128 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1129 fPyjets->K[3][iGlu] = -1;
1130 fPyjets->K[4][iGlu] = -1;
1131
1132 fPyjets->P[0][iGlu+1] = px2;
1133 fPyjets->P[1][iGlu+1] = py2;
1134 fPyjets->P[2][iGlu+1] = pz2;
1135 fPyjets->P[3][iGlu+1] = pst;
1136 fPyjets->P[4][iGlu+1] = 0.;
1137
4e383037 1138 fPyjets->K[0][iGlu+1] = 1;
1139 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
0f482ae4 1140 fPyjets->K[1][iGlu+1] = 21;
4e383037 1141 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
0f482ae4 1142 fPyjets->K[3][iGlu+1] = -1;
1143 fPyjets->K[4][iGlu+1] = -1;
1144 SetMSTU(1,0);
1145 SetMSTU(2,0);
1146 //
1147 // Boost back
1148 //
1149 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1150 }
4e383037 1151/*
1152 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1153 Double_t px, py, pz;
1154 px = fPyjets->P[0][ig];
1155 py = fPyjets->P[1][ig];
1156 pz = fPyjets->P[2][ig];
1157 TVector3 v(px, py, pz);
1158 v.RotateZ(-phiq[isys]);
1159 v.RotateY(-thetaq[isys]);
1160 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1161 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1162 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1163 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1164 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1165 pxs += jtKick * TMath::Cos(phiKick);
1166 pys += jtKick * TMath::Sin(phiKick);
1167 TVector3 w(pxs, pys, pzs);
1168 w.RotateY(thetaq[isys]);
1169 w.RotateZ(phiq[isys]);
1170 fPyjets->P[0][ig] = w.X();
1171 fPyjets->P[1][ig] = w.Y();
1172 fPyjets->P[2][ig] = w.Z();
1173 fPyjets->P[2][ig] = w.Mag();
1174 }
1175*/
1176 } // kGluon
1177
6e90ad26 1178
4e383037 1179 // Check energy conservation
0f482ae4 1180 Double_t pxs = 0.;
1181 Double_t pys = 0.;
1182 Double_t pzs = 0.;
1183 Double_t es = 14000.;
1184
1185 for (Int_t i = 0; i < numpart; i++)
1186 {
1187 kst = fPyjets->K[0][i];
1188 if (kst != 1 && kst != 2) continue;
1189 pxs += fPyjets->P[0][i];
1190 pys += fPyjets->P[1][i];
1191 pzs += fPyjets->P[2][i];
1192 es -= fPyjets->P[3][i];
1193 }
1194 if (TMath::Abs(pxs) > 1.e-2 ||
1195 TMath::Abs(pys) > 1.e-2 ||
1196 TMath::Abs(pzs) > 1.e-1) {
1197 printf("%e %e %e %e\n", pxs, pys, pzs, es);
4e383037 1198// Fatal("Quench()", "4-Momentum non-conservation");
452af8c7 1199 }
4e383037 1200
1201 } // end quenching loop (systems)
6e90ad26 1202// Clean-up
0f482ae4 1203 for (Int_t i = 0; i < numpart; i++)
1204 {
4e383037 1205 imo = fPyjets->K[2][i];
1206 if (imo > 1000) {
1207 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1208 }
0f482ae4 1209 }
4e383037 1210// this->Pylist(1);
0f482ae4 1211} // end quench
90d7b703 1212
992f2843 1213
1214void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1215{
1216 // Igor Lokthine's quenching routine
12cb0bc0 1217 // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1218
992f2843 1219 pyquen(a, ibf, b);
1220}
b280c4cc 1221
12cb0bc0 1222void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1223{
1224 // Set the parameters for the PYQUEN package.
1225 // See comments in PyquenCommon.h
1226
1227
1228 PYQPAR.t0 = t0;
1229 PYQPAR.tau0 = tau0;
1230 PYQPAR.nf = nf;
1231 PYQPAR.iengl = iengl;
1232 PYQPAR.iangl = iangl;
1233}
1234
1235
16a82508 1236void AliPythia::Pyevnw()
1237{
1238 // New multiple interaction scenario
1239 pyevnw();
1240}
1241
b280c4cc 1242void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1243{
1244 // Return event specific quenching parameters
1245 xp = fXJet;
1246 yp = fYJet;
1247 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1248
1249}
1250
3dc3ec94 1251void AliPythia::ConfigHeavyFlavor()
1252{
1253 //
1254 // Default configuration for Heavy Flavor production
1255 //
1256 // All QCD processes
1257 //
1258 SetMSEL(1);
1259
1260 // No multiple interactions
1261 SetMSTP(81,0);
39c2e610 1262 SetPARP(81, 0.);
1263 SetPARP(82, 0.);
3dc3ec94 1264 // Initial/final parton shower on (Pythia default)
1265 SetMSTP(61,1);
1266 SetMSTP(71,1);
1267
1268 // 2nd order alpha_s
1269 SetMSTP(2,2);
1270
1271 // QCD scales
1272 SetMSTP(32,2);
1273 SetPARP(34,1.0);
1274}
e0e89f40 1275
1276void AliPythia::AtlasTuning()
1277{
1278 //
1279 // Configuration for the ATLAS tuning
e2de0ce1 1280 SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
e0e89f40 1281 SetMSTP(81,1); // Multiple Interactions ON
1282 SetMSTP(82,4); // Double Gaussian Model
39c2e610 1283 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
e0e89f40 1284 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1285 SetPARP(89,1000.); // [GeV] Ref. energy
1286 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1287 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1288 SetPARP(84,0.5); // Core radius
1289 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1290 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1291 SetPARP(67,1); // Regulates Initial State Radiation
1292}
e8a8adcd 1293
1294AliPythia& AliPythia::operator=(const AliPythia& rhs)
1295{
1296// Assignment operator
1297 rhs.Copy(*this);
1298 return *this;
1299}
1300
1301 void AliPythia::Copy(TObject&) const
1302{
1303 //
1304 // Copy
1305 //
1306 Fatal("Copy","Not implemented!\n");
1307}