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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
16/* $Id$ */
17
18#include "AliPythia.h"
19#include "AliPythiaRndm.h"
20#include "AliFastGlauber.h"
21#include "AliQuenchingWeights.h"
22#include "AliOmegaDalitz.h"
23#include "TVector3.h"
24#include "TLorentzVector.h"
25#include "PyquenCommon.h"
26
27ClassImp(AliPythia)
28
29#ifndef WIN32
30# define pyclus pyclus_
31# define pycell pycell_
32# define pyshow pyshow_
33# define pyrobo pyrobo_
34# define pyquen pyquen_
35# define pyevnw pyevnw_
36# define pyshowq pyshowq_
37# define qpygin0 qpygin0_
38# define pytune pytune_
39# define py2ent py2ent_
40# define type_of_call
41#else
42# define pyclus PYCLUS
43# define pycell PYCELL
44# define pyrobo PYROBO
45# define pyquen PYQUEN
46# define pyevnw PYEVNW
47# define pyshowq PYSHOWQ
48# define qpygin0 QPYGIN0
49# define pytune PYTUNE
50# define py2ent PY2ENT
51# define type_of_call _stdcall
52#endif
53
54extern "C" void type_of_call pyclus(Int_t & );
55extern "C" void type_of_call pycell(Int_t & );
56extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
57extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
58extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
59extern "C" void type_of_call pyevnw();
60extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
61extern "C" void type_of_call pytune(Int_t &);
62extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
63extern "C" void type_of_call qpygin0();
64//_____________________________________________________________________________
65
66AliPythia* AliPythia::fgAliPythia=NULL;
67
68AliPythia::AliPythia():
69 fProcess(kPyMb),
70 fEcms(0.),
71 fStrucFunc(kCTEQ5L),
72 fProjectile("p"),
73 fTarget("p"),
74 fXJet(0.),
75 fYJet(0.),
76 fNGmax(30),
77 fZmax(0.97),
78 fGlauber(0),
79 fQuenchingWeights(0),
80 fItune(-1),
81 fOmegaDalitz()
82{
83// Default Constructor
84//
85// Set random number
86 if (!AliPythiaRndm::GetPythiaRandom())
87 AliPythiaRndm::SetPythiaRandom(GetRandom());
88 fGlauber = 0;
89 fQuenchingWeights = 0;
90 Int_t i = 0;
91 for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
92 for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
93 for (i = 0; i < 4; i++) fZQuench[i] = 0;
94}
95
96AliPythia::AliPythia(const AliPythia& pythia):
97 TPythia6(pythia),
98 AliRndm(pythia),
99 fProcess(kPyMb),
100 fEcms(0.),
101 fStrucFunc(kCTEQ5L),
102 fProjectile("p"),
103 fTarget("p"),
104 fXJet(0.),
105 fYJet(0.),
106 fNGmax(30),
107 fZmax(0.97),
108 fGlauber(0),
109 fQuenchingWeights(0),
110 fItune(-1),
111 fOmegaDalitz()
112{
113 // Copy Constructor
114 Int_t i;
115 for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
116 for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
117 for (i = 0; i < 4; i++) fZQuench[i] = 0;
118 pythia.Copy(*this);
119}
120
121void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
122{
123// Initialise the process to generate
124 if (!AliPythiaRndm::GetPythiaRandom())
125 AliPythiaRndm::SetPythiaRandom(GetRandom());
126
127 fItune = itune;
128
129 fProcess = process;
130 fEcms = energy;
131 fStrucFunc = strucfunc;
132//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
133 SetMDCY(Pycomp(111) ,1,0); // pi0
134 SetMDCY(Pycomp(310) ,1,0); // K0S
135 SetMDCY(Pycomp(3122),1,0); // kLambda
136 SetMDCY(Pycomp(3112),1,0); // sigma -
137 SetMDCY(Pycomp(3222),1,0); // sigma +
138 SetMDCY(Pycomp(3312),1,0); // xi -
139 SetMDCY(Pycomp(3322),1,0); // xi 0
140 SetMDCY(Pycomp(3334),1,0); // omega-
141 // Select structure function
142 SetMSTP(52,2);
143 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
144 // Particles produced in string fragmentation point directly to either of the two endpoints
145 // of the string (depending in the side they were generated from).
146 SetMSTU(16,2);
147
148//
149// Pythia initialisation for selected processes//
150//
151// Make MSEL clean
152//
153 for (Int_t i=1; i<= 200; i++) {
154 SetMSUB(i,0);
155 }
156// select charm production
157 switch (process)
158 {
159 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
160// Multiple interactions on.
161 SetMSTP(81,1);
162// Double Gaussian matter distribution.
163 SetMSTP(82,4);
164 SetPARP(83,0.5);
165 SetPARP(84,0.4);
166// pT0.
167 SetPARP(82,2.0);
168// Reference energy for pT0 and energy rescaling pace.
169 SetPARP(89,1800);
170 SetPARP(90,0.25);
171// String drawing almost completely minimizes string length.
172 SetPARP(85,0.9);
173 SetPARP(86,0.95);
174// ISR and FSR activity.
175 SetPARP(67,4);
176 SetPARP(71,4);
177// Lambda_FSR scale.
178 SetPARJ(81,0.29);
179 break;
180 case kPyOldUEQ2ordered2:
181// Old underlying events with Q2 ordered QCD processes
182// Multiple interactions on.
183 SetMSTP(81,1);
184// Double Gaussian matter distribution.
185 SetMSTP(82,4);
186 SetPARP(83,0.5);
187 SetPARP(84,0.4);
188// pT0.
189 SetPARP(82,2.0);
190// Reference energy for pT0 and energy rescaling pace.
191 SetPARP(89,1800);
192 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
193// String drawing almost completely minimizes string length.
194 SetPARP(85,0.9);
195 SetPARP(86,0.95);
196// ISR and FSR activity.
197 SetPARP(67,4);
198 SetPARP(71,4);
199// Lambda_FSR scale.
200 SetPARJ(81,0.29);
201 break;
202 case kPyOldPopcorn:
203// Old production mechanism: Old Popcorn
204 SetMSEL(1);
205 SetMSTJ(12,3);
206// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
207 SetMSTP(88,2);
208// (D=1)see can be used to form baryons (BARYON JUNCTION)
209 SetMSTJ(1,1);
210 AtlasTuning();
211 break;
212 case kPyCharm:
213 SetMSEL(4);
214// heavy quark masses
215
216 SetPMAS(4,1,1.2);
217//
218// primordial pT
219 SetMSTP(91,1);
220 SetPARP(91,1.);
221 SetPARP(93,5.);
222//
223 break;
224 case kPyBeauty:
225 SetMSEL(5);
226 SetPMAS(5,1,4.75);
227 break;
228 case kPyJpsi:
229 SetMSEL(0);
230// gg->J/Psi g
231 SetMSUB(86,1);
232 break;
233 case kPyJpsiChi:
234 SetMSEL(0);
235// gg->J/Psi g
236 SetMSUB(86,1);
237// gg-> chi_0c g
238 SetMSUB(87,1);
239// gg-> chi_1c g
240 SetMSUB(88,1);
241// gg-> chi_2c g
242 SetMSUB(89,1);
243 break;
244 case kPyCharmUnforced:
245 SetMSEL(0);
246// gq->qg
247 SetMSUB(28,1);
248// gg->qq
249 SetMSUB(53,1);
250// gg->gg
251 SetMSUB(68,1);
252 break;
253 case kPyBeautyUnforced:
254 SetMSEL(0);
255// gq->qg
256 SetMSUB(28,1);
257// gg->qq
258 SetMSUB(53,1);
259// gg->gg
260 SetMSUB(68,1);
261 break;
262 case kPyMb:
263// Minimum Bias pp-Collisions
264//
265//
266// select Pythia min. bias model
267 SetMSEL(0);
268 SetMSUB(92,1); // single diffraction AB-->XB
269 SetMSUB(93,1); // single diffraction AB-->AX
270 SetMSUB(94,1); // double diffraction
271 SetMSUB(95,1); // low pt production
272
273 AtlasTuning();
274 break;
275
276 case kPyMbAtlasTuneMC09:
277// Minimum Bias pp-Collisions
278//
279//
280// select Pythia min. bias model
281 SetMSEL(0);
282 SetMSUB(92,1); // single diffraction AB-->XB
283 SetMSUB(93,1); // single diffraction AB-->AX
284 SetMSUB(94,1); // double diffraction
285 SetMSUB(95,1); // low pt production
286
287 AtlasTuningMC09();
288 break;
289
290 case kPyMbWithDirectPhoton:
291// Minimum Bias pp-Collisions with direct photon processes added
292//
293//
294// select Pythia min. bias model
295 SetMSEL(0);
296 SetMSUB(92,1); // single diffraction AB-->XB
297 SetMSUB(93,1); // single diffraction AB-->AX
298 SetMSUB(94,1); // double diffraction
299 SetMSUB(95,1); // low pt production
300
301 SetMSUB(14,1); //
302 SetMSUB(18,1); //
303 SetMSUB(29,1); //
304 SetMSUB(114,1); //
305 SetMSUB(115,1); //
306
307
308 AtlasTuning();
309 break;
310
311 case kPyMbDefault:
312// Minimum Bias pp-Collisions
313//
314//
315// select Pythia min. bias model
316 SetMSEL(0);
317 SetMSUB(92,1); // single diffraction AB-->XB
318 SetMSUB(93,1); // single diffraction AB-->AX
319 SetMSUB(94,1); // double diffraction
320 SetMSUB(95,1); // low pt production
321 break;
322 case kPyLhwgMb:
323// Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
324// -> Pythia 6.3 or above is needed
325//
326 SetMSEL(0);
327 SetMSUB(92,1); // single diffraction AB-->XB
328 SetMSUB(93,1); // single diffraction AB-->AX
329 SetMSUB(94,1); // double diffraction
330 SetMSUB(95,1); // low pt production
331
332 SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
333 SetMSTP(52,2);
334 SetMSTP(68,1);
335 SetMSTP(70,2);
336 SetMSTP(81,1); // Multiple Interactions ON
337 SetMSTP(82,4); // Double Gaussian Model
338 SetMSTP(88,1);
339
340 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
341 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
342 SetPARP(84,0.5); // Core radius
343 SetPARP(85,0.9); // Regulates gluon prod. mechanism
344 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
345
346 break;
347 case kPyMbNonDiffr:
348// Minimum Bias pp-Collisions
349//
350//
351// select Pythia min. bias model
352 SetMSEL(0);
353 SetMSUB(95,1); // low pt production
354
355 AtlasTuning();
356 break;
357 case kPyMbMSEL1:
358 ConfigHeavyFlavor();
359// Intrinsic <kT^2>
360 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
361 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
362 SetPARP(93,5.); // Upper cut-off
363// Set Q-quark mass
364 SetPMAS(4,1,1.2); // Charm quark mass
365 SetPMAS(5,1,4.78); // Beauty quark mass
366 SetPARP(71,4.); // Defaut value
367// Atlas Tuning
368 AtlasTuning();
369 break;
370 case kPyJets:
371//
372// QCD Jets
373//
374 SetMSEL(1);
375 // Pythia Tune A (CDF)
376 //
377 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
378 SetMSTP(82,4); // Double Gaussian Model
379 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
380 SetPARP(84,0.4); // Core radius
381 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
382 SetPARP(86,0.95); // Regulates gluon prod. mechanism
383 SetPARP(89,1800.); // [GeV] Ref. energy
384 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
385 break;
386 case kPyDirectGamma:
387 SetMSEL(10);
388 break;
389 case kPyCharmPbPbMNR:
390 case kPyD0PbPbMNR:
391 case kPyDPlusPbPbMNR:
392 case kPyDPlusStrangePbPbMNR:
393 // Tuning of Pythia parameters aimed to get a resonable agreement
394 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
395 // c-cbar single inclusive and double differential distributions.
396 // This parameter settings are meant to work with Pb-Pb collisions
397 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
398 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
399 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
400 ConfigHeavyFlavor();
401 // Intrinsic <kT>
402 SetMSTP(91,1);
403 SetPARP(91,1.304);
404 SetPARP(93,6.52);
405 // Set c-quark mass
406 SetPMAS(4,1,1.2);
407 break;
408 case kPyCharmpPbMNR:
409 case kPyD0pPbMNR:
410 case kPyDPluspPbMNR:
411 case kPyDPlusStrangepPbMNR:
412 // Tuning of Pythia parameters aimed to get a resonable agreement
413 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
414 // c-cbar single inclusive and double differential distributions.
415 // This parameter settings are meant to work with p-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 2.1GeV. Example in ConfigCharmPPR.C.
419 ConfigHeavyFlavor();
420 // Intrinsic <kT>
421 SetMSTP(91,1);
422 SetPARP(91,1.16);
423 SetPARP(93,5.8);
424
425 // Set c-quark mass
426 SetPMAS(4,1,1.2);
427 break;
428 case kPyCharmppMNR:
429 case kPyD0ppMNR:
430 case kPyDPlusppMNR:
431 case kPyDPlusStrangeppMNR:
432 case kPyLambdacppMNR:
433 // Tuning of Pythia parameters aimed to get a resonable agreement
434 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
435 // c-cbar single inclusive and double differential distributions.
436 // This parameter settings are meant to work with pp collisions
437 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
438 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
439 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
440 ConfigHeavyFlavor();
441 // Intrinsic <kT^2>
442 SetMSTP(91,1);
443 SetPARP(91,1.);
444 SetPARP(93,5.);
445
446 // Set c-quark mass
447 SetPMAS(4,1,1.2);
448 break;
449 case kPyCharmppMNRwmi:
450 // Tuning of Pythia parameters aimed to get a resonable agreement
451 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
452 // c-cbar single inclusive and double differential distributions.
453 // This parameter settings are meant to work with pp collisions
454 // and with kCTEQ5L PDFs.
455 // Added multiple interactions according to ATLAS tune settings.
456 // To get a "reasonable" agreement with MNR results, events have to be
457 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
458 // set to 2.76 GeV.
459 // To get a "perfect" agreement with MNR results, events have to be
460 // generated in four ptHard bins with the following relative
461 // normalizations:
462 // 2.76-3 GeV: 25%
463 // 3-4 GeV: 40%
464 // 4-8 GeV: 29%
465 // >8 GeV: 6%
466 ConfigHeavyFlavor();
467 // Intrinsic <kT^2>
468 SetMSTP(91,1);
469 SetPARP(91,1.);
470 SetPARP(93,5.);
471
472 // Set c-quark mass
473 SetPMAS(4,1,1.2);
474 AtlasTuning();
475 break;
476 case kPyBeautyPbPbMNR:
477 // Tuning of Pythia parameters aimed to get a resonable agreement
478 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
479 // b-bbar single inclusive and double differential distributions.
480 // This parameter settings are meant to work with Pb-Pb collisions
481 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
482 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
483 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
484 ConfigHeavyFlavor();
485 // QCD scales
486 SetPARP(67,1.0);
487 SetPARP(71,1.0);
488 // Intrinsic <kT>
489 SetMSTP(91,1);
490 SetPARP(91,2.035);
491 SetPARP(93,10.17);
492 // Set b-quark mass
493 SetPMAS(5,1,4.75);
494 break;
495 case kPyBeautypPbMNR:
496 // Tuning of Pythia parameters aimed to get a resonable agreement
497 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
498 // b-bbar single inclusive and double differential distributions.
499 // This parameter settings are meant to work with p-Pb collisions
500 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
501 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
502 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
503 ConfigHeavyFlavor();
504 // QCD scales
505 SetPARP(67,1.0);
506 SetPARP(71,1.0);
507 // Intrinsic <kT>
508 SetMSTP(91,1);
509 SetPARP(91,1.60);
510 SetPARP(93,8.00);
511 // Set b-quark mass
512 SetPMAS(5,1,4.75);
513 break;
514 case kPyBeautyppMNR:
515 // Tuning of Pythia parameters aimed to get a resonable agreement
516 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
517 // b-bbar single inclusive and double differential distributions.
518 // This parameter settings are meant to work with pp collisions
519 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
520 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
521 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
522 ConfigHeavyFlavor();
523 // QCD scales
524 SetPARP(67,1.0);
525 SetPARP(71,1.0);
526
527 // Intrinsic <kT>
528 SetMSTP(91,1);
529 SetPARP(91,1.);
530 SetPARP(93,5.);
531
532 // Set b-quark mass
533 SetPMAS(5,1,4.75);
534 break;
535 case kPyBeautyJets:
536 case kPyBeautyppMNRwmi:
537 // Tuning of Pythia parameters aimed to get a resonable agreement
538 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
539 // b-bbar single inclusive and double differential distributions.
540 // This parameter settings are meant to work with pp collisions
541 // and with kCTEQ5L PDFs.
542 // Added multiple interactions according to ATLAS tune settings.
543 // To get a "reasonable" agreement with MNR results, events have to be
544 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
545 // set to 2.76 GeV.
546 // To get a "perfect" agreement with MNR results, events have to be
547 // generated in four ptHard bins with the following relative
548 // normalizations:
549 // 2.76-4 GeV: 5%
550 // 4-6 GeV: 31%
551 // 6-8 GeV: 28%
552 // >8 GeV: 36%
553 ConfigHeavyFlavor();
554 // QCD scales
555 SetPARP(67,1.0);
556 SetPARP(71,1.0);
557
558 // Intrinsic <kT>
559 SetMSTP(91,1);
560 SetPARP(91,1.);
561 SetPARP(93,5.);
562
563 // Set b-quark mass
564 SetPMAS(5,1,4.75);
565
566 AtlasTuning();
567 break;
568 case kPyW:
569
570 //Inclusive production of W+/-
571 SetMSEL(0);
572 //f fbar -> W+
573 SetMSUB(2,1);
574 // //f fbar -> g W+
575 // SetMSUB(16,1);
576 // //f fbar -> gamma W+
577 // SetMSUB(20,1);
578 // //f g -> f W+
579 // SetMSUB(31,1);
580 // //f gamma -> f W+
581 // SetMSUB(36,1);
582
583 // Initial/final parton shower on (Pythia default)
584 // With parton showers on we are generating "W inclusive process"
585 SetMSTP(61,1); //Initial QCD & QED showers on
586 SetMSTP(71,1); //Final QCD & QED showers on
587
588 break;
589
590 case kPyZ:
591
592 //Inclusive production of Z
593 SetMSEL(0);
594 //f fbar -> Z/gamma
595 SetMSUB(1,1);
596
597 // // f fbar -> g Z/gamma
598 // SetMSUB(15,1);
599 // // f fbar -> gamma Z/gamma
600 // SetMSUB(19,1);
601 // // f g -> f Z/gamma
602 // SetMSUB(30,1);
603 // // f gamma -> f Z/gamma
604 // SetMSUB(35,1);
605
606 //only Z included, not gamma
607 SetMSTP(43,2);
608
609 // Initial/final parton shower on (Pythia default)
610 // With parton showers on we are generating "Z inclusive process"
611 SetMSTP(61,1); //Initial QCD & QED showers on
612 SetMSTP(71,1); //Final QCD & QED showers on
613
614 break;
615 case kPyMBRSingleDiffraction:
616 case kPyMBRDoubleDiffraction:
617 case kPyMBRCentralDiffraction:
618 break;
619 }
620//
621// Initialize PYTHIA
622//
623// Select the tune
624 if (itune > -1) Pytune(itune);
625
626//
627 SetMSTP(41,1); // all resonance decays switched on
628 Initialize("CMS",fProjectile,fTarget,fEcms);
629 fOmegaDalitz.Init();
630}
631
632Int_t AliPythia::CheckedLuComp(Int_t kf)
633{
634// Check Lund particle code (for debugging)
635 Int_t kc=Pycomp(kf);
636 printf("\n Lucomp kf,kc %d %d",kf,kc);
637 return kc;
638}
639
640void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
641{
642// Treat protons as inside nuclei with mass numbers a1 and a2
643// The MSTP array in the PYPARS common block is used to enable and
644// select the nuclear structure functions.
645// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
646// =1: internal PYTHIA acording to MSTP(51)
647// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
648// If the following mass number both not equal zero, nuclear corrections of the stf are used.
649// MSTP(192) : Mass number of nucleus side 1
650// MSTP(193) : Mass number of nucleus side 2
651// MSTP(194) : Nuclear structure function: 0: EKS98 8:EPS08 9:EPS09LO 19:EPS09NLO
652 SetMSTP(52,2);
653 SetMSTP(192, a1);
654 SetMSTP(193, a2);
655 SetMSTP(194, pdf);
656}
657
658
659AliPythia* AliPythia::Instance()
660{
661// Set random number generator
662 if (fgAliPythia) {
663 return fgAliPythia;
664 } else {
665 fgAliPythia = new AliPythia();
666 return fgAliPythia;
667 }
668}
669
670void AliPythia::PrintParticles()
671{
672// Print list of particl properties
673 Int_t np = 0;
674 char* name = new char[16];
675 for (Int_t kf=0; kf<1000000; kf++) {
676 for (Int_t c = 1; c > -2; c-=2) {
677 Int_t kc = Pycomp(c*kf);
678 if (kc) {
679 Float_t mass = GetPMAS(kc,1);
680 Float_t width = GetPMAS(kc,2);
681 Float_t tau = GetPMAS(kc,4);
682
683 Pyname(kf,name);
684
685 np++;
686
687 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
688 c*kf, name, mass, width, tau);
689 }
690 }
691 }
692 printf("\n Number of particles %d \n \n", np);
693}
694
695void AliPythia::ResetDecayTable()
696{
697// Set default values for pythia decay switches
698 Int_t i;
699 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
700 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
701}
702
703void AliPythia::SetDecayTable()
704{
705// Set default values for pythia decay switches
706//
707 Int_t i;
708 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
709 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
710}
711
712void AliPythia::Pyclus(Int_t& njet)
713{
714// Call Pythia clustering algorithm
715//
716 pyclus(njet);
717}
718
719void AliPythia::Pycell(Int_t& njet)
720{
721// Call Pythia jet reconstruction algorithm
722//
723 pycell(njet);
724}
725
726void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
727{
728// Call Pythia jet reconstruction algorithm
729//
730 pyshow(ip1, ip2, qmax);
731}
732
733void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
734{
735 pyrobo(imi, ima, the, phi, bex, bey, bez);
736}
737
738void AliPythia::Pytune(Int_t itune)
739{
740/*
741C
742C ITUNE NAME (detailed descriptions below)
743C 0 Default : No settings changed => linked Pythia version's defaults.
744C ====== Old UE, Q2-ordered showers ==========================================
745C 100 A : Rick Field's CDF Tune A
746C 101 AW : Rick Field's CDF Tune AW
747C 102 BW : Rick Field's CDF Tune BW
748C 103 DW : Rick Field's CDF Tune DW
749C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
750C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
751C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
752C 107 ACR : Tune A modified with annealing CR
753C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
754C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
755C ====== Intermediate Models =================================================
756C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
757C 201 APT : Tune A modified to use pT-ordered final-state showers
758C ====== New UE, interleaved pT-ordered showers, annealing CR ================
759C 300 S0 : Sandhoff-Skands Tune 0
760C 301 S1 : Sandhoff-Skands Tune 1
761C 302 S2 : Sandhoff-Skands Tune 2
762C 303 S0A : S0 with "Tune A" UE energy scaling
763C 304 NOCR : New UE "best try" without colour reconnections
764C 305 Old : New UE, original (primitive) colour reconnections
765C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
766C ======= The Uppsala models =================================================
767C ( NB! must be run with special modified Pythia 6.215 version )
768C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
769C 400 GAL 0 : Generalized area-law model. Old parameters
770C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
771C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
772*/
773 pytune(itune);
774}
775
776void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
777 // Inset 2-parton system at line idx
778 py2ent(idx, pdg1, pdg2, p);
779}
780
781
782void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
783{
784// Initializes
785// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
786// (2) The nuclear geometry using the Glauber Model
787//
788
789 fGlauber = AliFastGlauber::Instance();
790 fGlauber->Init(2);
791 fGlauber->SetCentralityClass(cMin, cMax);
792
793 fQuenchingWeights = new AliQuenchingWeights();
794 fQuenchingWeights->InitMult();
795 fQuenchingWeights->SetK(k);
796 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
797 fNGmax = ngmax;
798 fZmax = zmax;
799
800}
801
802
803void AliPythia::Quench()
804{
805//
806//
807// Simple Jet Quenching routine:
808// =============================
809// The jet formed by all final state partons radiated by the parton created
810// in the hard collisions is quenched by a factor (1-z) using light cone variables in
811// the initial parton reference frame:
812// (E + p_z)new = (1-z) (E + p_z)old
813//
814//
815//
816//
817// The lost momentum is first balanced by one gluon with virtuality > 0.
818// Subsequently the gluon splits to yield two gluons with E = p.
819//
820//
821//
822 static Float_t eMean = 0.;
823 static Int_t icall = 0;
824
825 Double_t p0[4][5];
826 Double_t p1[4][5];
827 Double_t p2[4][5];
828 Int_t klast[4] = {-1, -1, -1, -1};
829
830 Int_t numpart = fPyjets->N;
831 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
832 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
833 Bool_t quenched[4];
834 Double_t wjtKick[4] = {0., 0., 0., 0.};
835 Int_t nGluon[4];
836 Int_t qPdg[4];
837 Int_t imo, kst, pdg;
838
839//
840// Sore information about Primary partons
841//
842// j =
843// 0, 1 partons from hard scattering
844// 2, 3 partons from initial state radiation
845//
846 for (Int_t i = 2; i <= 7; i++) {
847 Int_t j = 0;
848 // Skip gluons that participate in hard scattering
849 if (i == 4 || i == 5) continue;
850 // Gluons from hard Scattering
851 if (i == 6 || i == 7) {
852 j = i - 6;
853 pxq[j] = fPyjets->P[0][i];
854 pyq[j] = fPyjets->P[1][i];
855 pzq[j] = fPyjets->P[2][i];
856 eq[j] = fPyjets->P[3][i];
857 mq[j] = fPyjets->P[4][i];
858 } else {
859 // Gluons from initial state radiation
860 //
861 // Obtain 4-momentum vector from difference between original parton and parton after gluon
862 // radiation. Energy is calculated independently because initial state radition does not
863 // conserve strictly momentum and energy for each partonic system independently.
864 //
865 // Not very clean. Should be improved !
866 //
867 //
868 j = i;
869 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
870 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
871 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
872 mq[j] = fPyjets->P[4][i];
873 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
874 }
875//
876// Calculate some kinematic variables
877//
878 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
879 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
880 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
881 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
882 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
883 qPdg[j] = fPyjets->K[1][i];
884 }
885
886 Double_t int0[4];
887 Double_t int1[4];
888
889 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
890
891 for (Int_t j = 0; j < 4; j++) {
892 //
893 // Quench only central jets and with E > 10.
894 //
895
896
897 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
898 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
899
900 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
901 fZQuench[j] = 0.;
902 } else {
903 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
904 icall ++;
905 eMean += eloss;
906 }
907 //
908 // Extra pt
909 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
910 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
911 //
912 // Fractional energy loss
913 fZQuench[j] = eloss / eq[j];
914 //
915 // Avoid complete loss
916 //
917 if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
918 //
919 // Some debug printing
920
921
922// 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",
923// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
924
925// fZQuench[j] = 0.8;
926// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
927 }
928
929 quenched[j] = (fZQuench[j] > 0.01);
930 } // primary partons
931
932
933
934 Double_t pNew[1000][4];
935 Int_t kNew[1000];
936 Int_t icount = 0;
937 Double_t zquench[4];
938
939//
940// System Loop
941 for (Int_t isys = 0; isys < 4; isys++) {
942// Skip to next system if not quenched.
943 if (!quenched[isys]) continue;
944
945 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
946 if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
947 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
948 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
949
950
951
952 Int_t igMin = -1;
953 Int_t igMax = -1;
954 Double_t pg[4] = {0., 0., 0., 0.};
955
956//
957// Loop on radiation events
958
959 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
960 while (1) {
961 icount = 0;
962 for (Int_t k = 0; k < 4; k++)
963 {
964 p0[isys][k] = 0.;
965 p1[isys][k] = 0.;
966 p2[isys][k] = 0.;
967 }
968// Loop over partons
969 for (Int_t i = 0; i < numpart; i++)
970 {
971 imo = fPyjets->K[2][i];
972 kst = fPyjets->K[0][i];
973 pdg = fPyjets->K[1][i];
974
975
976
977// Quarks and gluons only
978 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
979// Particles from hard scattering only
980
981 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
982 Int_t imom = imo % 1000;
983 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
984 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
985
986
987// Skip comment lines
988 if (kst != 1 && kst != 2) continue;
989//
990// Parton kinematic
991 px = fPyjets->P[0][i];
992 py = fPyjets->P[1][i];
993 pz = fPyjets->P[2][i];
994 e = fPyjets->P[3][i];
995 m = fPyjets->P[4][i];
996 pt = TMath::Sqrt(px * px + py * py);
997 p = TMath::Sqrt(px * px + py * py + pz * pz);
998 phi = TMath::Pi() + TMath::ATan2(-py, -px);
999 theta = TMath::ATan2(pt, pz);
1000
1001//
1002// Save 4-momentum sum for balancing
1003 Int_t index = isys;
1004
1005 p0[index][0] += px;
1006 p0[index][1] += py;
1007 p0[index][2] += pz;
1008 p0[index][3] += e;
1009
1010 klast[index] = i;
1011
1012//
1013// Fractional energy loss
1014 Double_t z = zquench[index];
1015
1016
1017// Don't fully quench radiated gluons
1018//
1019 if (imo > 1000) {
1020// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
1021//
1022
1023 z = 0.02;
1024 }
1025// printf("z: %d %f\n", imo, z);
1026
1027
1028//
1029
1030 //
1031 //
1032 // Transform into frame in which initial parton is along z-axis
1033 //
1034 TVector3 v(px, py, pz);
1035 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
1036 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
1037
1038 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
1039 Double_t mt2 = jt * jt + m * m;
1040 Double_t zmax = 1.;
1041 //
1042 // Kinematic limit on z
1043 //
1044 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
1045 //
1046 // Change light-cone kinematics rel. to initial parton
1047 //
1048 Double_t eppzOld = e + pl;
1049 Double_t empzOld = e - pl;
1050
1051 Double_t eppzNew = (1. - z) * eppzOld;
1052 Double_t empzNew = empzOld - mt2 * z / eppzOld;
1053 Double_t eNew = 0.5 * (eppzNew + empzNew);
1054 Double_t plNew = 0.5 * (eppzNew - empzNew);
1055
1056 Double_t jtNew;
1057 //
1058 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
1059 Double_t mt2New = eppzNew * empzNew;
1060 if (mt2New < 1.e-8) mt2New = 0.;
1061 if (z < zmax) {
1062 if (m * m > mt2New) {
1063 //
1064 // This should not happen
1065 //
1066 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
1067 jtNew = 0;
1068 } else {
1069 jtNew = TMath::Sqrt(mt2New - m * m);
1070 }
1071 } else {
1072 // If pT is to small (probably a leading massive particle) we scale only the energy
1073 // This can cause negative masses of the radiated gluon
1074 // Let's hope for the best ...
1075 jtNew = jt;
1076 eNew = TMath::Sqrt(plNew * plNew + mt2);
1077
1078 }
1079 //
1080 // Calculate new px, py
1081 //
1082 Double_t pxNew = 0;
1083 Double_t pyNew = 0;
1084
1085 if (jt>0) {
1086 pxNew = jtNew / jt * pxs;
1087 pyNew = jtNew / jt * pys;
1088 }
1089// Double_t dpx = pxs - pxNew;
1090// Double_t dpy = pys - pyNew;
1091// Double_t dpz = pl - plNew;
1092// Double_t de = e - eNew;
1093// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
1094// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
1095// printf("New mass (2) %e %e \n", pxNew, pyNew);
1096 //
1097 // Rotate back
1098 //
1099 TVector3 w(pxNew, pyNew, plNew);
1100 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
1101 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
1102
1103 p1[index][0] += pxNew;
1104 p1[index][1] += pyNew;
1105 p1[index][2] += plNew;
1106 p1[index][3] += eNew;
1107 //
1108 // Updated 4-momentum vectors
1109 //
1110 pNew[icount][0] = pxNew;
1111 pNew[icount][1] = pyNew;
1112 pNew[icount][2] = plNew;
1113 pNew[icount][3] = eNew;
1114 kNew[icount] = i;
1115 icount++;
1116 } // parton loop
1117 //
1118 // Check if there was phase-space for quenching
1119 //
1120
1121 if (icount == 0) quenched[isys] = kFALSE;
1122 if (!quenched[isys]) break;
1123
1124 for (Int_t j = 0; j < 4; j++)
1125 {
1126 p2[isys][j] = p0[isys][j] - p1[isys][j];
1127 }
1128 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];
1129 if (p2[isys][4] > 0.) {
1130 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1131 break;
1132 } else {
1133 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
1134 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]);
1135 if (p2[isys][4] < -0.01) {
1136 printf("Negative mass squared !\n");
1137 // Here we have to put the gluon back to mass shell
1138 // This will lead to a small energy imbalance
1139 p2[isys][4] = 0.;
1140 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1141 break;
1142 } else {
1143 p2[isys][4] = 0.;
1144 break;
1145 }
1146 }
1147 /*
1148 zHeavy *= 0.98;
1149 printf("zHeavy lowered to %f\n", zHeavy);
1150 if (zHeavy < 0.01) {
1151 printf("No success ! \n");
1152 icount = 0;
1153 quenched[isys] = kFALSE;
1154 break;
1155 }
1156 */
1157 } // iteration on z (while)
1158
1159// Update event record
1160 for (Int_t k = 0; k < icount; k++) {
1161// 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] );
1162 fPyjets->P[0][kNew[k]] = pNew[k][0];
1163 fPyjets->P[1][kNew[k]] = pNew[k][1];
1164 fPyjets->P[2][kNew[k]] = pNew[k][2];
1165 fPyjets->P[3][kNew[k]] = pNew[k][3];
1166 }
1167 //
1168 // Add the gluons
1169 //
1170 Int_t ish = 0;
1171 Int_t iGlu;
1172 if (!quenched[isys]) continue;
1173//
1174// Last parton from shower i
1175 Int_t in = klast[isys];
1176//
1177// Continue if no parton in shower i selected
1178 if (in == -1) continue;
1179//
1180// If this is the second initial parton and it is behind the first move pointer by previous ish
1181 if (isys == 1 && klast[1] > klast[0]) in += ish;
1182//
1183// Starting index
1184
1185// jmin = in - 1;
1186// How many additional gluons will be generated
1187 ish = 1;
1188 if (p2[isys][4] > 0.05) ish = 2;
1189//
1190// Position of gluons
1191 iGlu = numpart;
1192 if (iglu == 0) igMin = iGlu;
1193 igMax = iGlu;
1194 numpart += ish;
1195 (fPyjets->N) += ish;
1196
1197 if (ish == 1) {
1198 fPyjets->P[0][iGlu] = p2[isys][0];
1199 fPyjets->P[1][iGlu] = p2[isys][1];
1200 fPyjets->P[2][iGlu] = p2[isys][2];
1201 fPyjets->P[3][iGlu] = p2[isys][3];
1202 fPyjets->P[4][iGlu] = p2[isys][4];
1203
1204 fPyjets->K[0][iGlu] = 1;
1205 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
1206 fPyjets->K[1][iGlu] = 21;
1207 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1208 fPyjets->K[3][iGlu] = -1;
1209 fPyjets->K[4][iGlu] = -1;
1210
1211 pg[0] += p2[isys][0];
1212 pg[1] += p2[isys][1];
1213 pg[2] += p2[isys][2];
1214 pg[3] += p2[isys][3];
1215 } else {
1216 //
1217 // Split gluon in rest frame.
1218 //
1219 Double_t bx = p2[isys][0] / p2[isys][3];
1220 Double_t by = p2[isys][1] / p2[isys][3];
1221 Double_t bz = p2[isys][2] / p2[isys][3];
1222 Double_t pst = p2[isys][4] / 2.;
1223 //
1224 // Isotropic decay ????
1225 Double_t cost = 2. * gRandom->Rndm() - 1.;
1226 Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
1227 Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
1228
1229 Double_t pz1 = pst * cost;
1230 Double_t pz2 = -pst * cost;
1231 Double_t pt1 = pst * sint;
1232 Double_t pt2 = -pst * sint;
1233 Double_t px1 = pt1 * TMath::Cos(phis);
1234 Double_t py1 = pt1 * TMath::Sin(phis);
1235 Double_t px2 = pt2 * TMath::Cos(phis);
1236 Double_t py2 = pt2 * TMath::Sin(phis);
1237
1238 fPyjets->P[0][iGlu] = px1;
1239 fPyjets->P[1][iGlu] = py1;
1240 fPyjets->P[2][iGlu] = pz1;
1241 fPyjets->P[3][iGlu] = pst;
1242 fPyjets->P[4][iGlu] = 0.;
1243
1244 fPyjets->K[0][iGlu] = 1 ;
1245 fPyjets->K[1][iGlu] = 21;
1246 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1247 fPyjets->K[3][iGlu] = -1;
1248 fPyjets->K[4][iGlu] = -1;
1249
1250 fPyjets->P[0][iGlu+1] = px2;
1251 fPyjets->P[1][iGlu+1] = py2;
1252 fPyjets->P[2][iGlu+1] = pz2;
1253 fPyjets->P[3][iGlu+1] = pst;
1254 fPyjets->P[4][iGlu+1] = 0.;
1255
1256 fPyjets->K[0][iGlu+1] = 1;
1257 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
1258 fPyjets->K[1][iGlu+1] = 21;
1259 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
1260 fPyjets->K[3][iGlu+1] = -1;
1261 fPyjets->K[4][iGlu+1] = -1;
1262 SetMSTU(1,0);
1263 SetMSTU(2,0);
1264 //
1265 // Boost back
1266 //
1267 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1268 }
1269/*
1270 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1271 Double_t px, py, pz;
1272 px = fPyjets->P[0][ig];
1273 py = fPyjets->P[1][ig];
1274 pz = fPyjets->P[2][ig];
1275 TVector3 v(px, py, pz);
1276 v.RotateZ(-phiq[isys]);
1277 v.RotateY(-thetaq[isys]);
1278 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1279 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1280 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1281 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1282 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1283 pxs += jtKick * TMath::Cos(phiKick);
1284 pys += jtKick * TMath::Sin(phiKick);
1285 TVector3 w(pxs, pys, pzs);
1286 w.RotateY(thetaq[isys]);
1287 w.RotateZ(phiq[isys]);
1288 fPyjets->P[0][ig] = w.X();
1289 fPyjets->P[1][ig] = w.Y();
1290 fPyjets->P[2][ig] = w.Z();
1291 fPyjets->P[2][ig] = w.Mag();
1292 }
1293*/
1294 } // kGluon
1295
1296
1297 // Check energy conservation
1298 Double_t pxs = 0.;
1299 Double_t pys = 0.;
1300 Double_t pzs = 0.;
1301 Double_t es = 14000.;
1302
1303 for (Int_t i = 0; i < numpart; i++)
1304 {
1305 kst = fPyjets->K[0][i];
1306 if (kst != 1 && kst != 2) continue;
1307 pxs += fPyjets->P[0][i];
1308 pys += fPyjets->P[1][i];
1309 pzs += fPyjets->P[2][i];
1310 es -= fPyjets->P[3][i];
1311 }
1312 if (TMath::Abs(pxs) > 1.e-2 ||
1313 TMath::Abs(pys) > 1.e-2 ||
1314 TMath::Abs(pzs) > 1.e-1) {
1315 printf("%e %e %e %e\n", pxs, pys, pzs, es);
1316// Fatal("Quench()", "4-Momentum non-conservation");
1317 }
1318
1319 } // end quenching loop (systems)
1320// Clean-up
1321 for (Int_t i = 0; i < numpart; i++)
1322 {
1323 imo = fPyjets->K[2][i];
1324 if (imo > 1000) {
1325 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1326 }
1327 }
1328// this->Pylist(1);
1329} // end quench
1330
1331
1332void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1333{
1334 // Igor Lokthine's quenching routine
1335 // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1336
1337 pyquen(a, ibf, b);
1338}
1339
1340void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1341{
1342 // Set the parameters for the PYQUEN package.
1343 // See comments in PyquenCommon.h
1344
1345
1346 PYQPAR.t0 = t0;
1347 PYQPAR.tau0 = tau0;
1348 PYQPAR.nf = nf;
1349 PYQPAR.iengl = iengl;
1350 PYQPAR.iangl = iangl;
1351}
1352
1353
1354void AliPythia::Pyevnw()
1355{
1356 // New multiple interaction scenario
1357 pyevnw();
1358}
1359
1360void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
1361{
1362 // Call medium-modified Pythia jet reconstruction algorithm
1363 //
1364 pyshowq(ip1, ip2, qmax);
1365}
1366 void AliPythia::Qpygin0()
1367 {
1368 // New multiple interaction scenario
1369 qpygin0();
1370 }
1371
1372void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1373{
1374 // Return event specific quenching parameters
1375 xp = fXJet;
1376 yp = fYJet;
1377 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1378
1379}
1380
1381void AliPythia::ConfigHeavyFlavor()
1382{
1383 //
1384 // Default configuration for Heavy Flavor production
1385 //
1386 // All QCD processes
1387 //
1388 SetMSEL(1);
1389
1390
1391 if (fItune < 0) {
1392 // No multiple interactions
1393 SetMSTP(81,0);
1394 SetPARP(81, 0.);
1395 SetPARP(82, 0.);
1396 }
1397 // Initial/final parton shower on (Pythia default)
1398 SetMSTP(61,1);
1399 SetMSTP(71,1);
1400
1401 // 2nd order alpha_s
1402 SetMSTP(2,2);
1403
1404 // QCD scales
1405 SetMSTP(32,2);
1406 SetPARP(34,1.0);
1407}
1408
1409void AliPythia::AtlasTuning()
1410{
1411 //
1412 // Configuration for the ATLAS tuning
1413 if (fItune > -1) return;
1414 printf("ATLAS TUNE \n");
1415
1416 SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
1417 SetMSTP(81,1); // Multiple Interactions ON
1418 SetMSTP(82,4); // Double Gaussian Model
1419 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
1420 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1421 SetPARP(89,1000.); // [GeV] Ref. energy
1422 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1423 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1424 SetPARP(84,0.5); // Core radius
1425 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1426 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1427 SetPARP(67,1); // Regulates Initial State Radiation
1428}
1429
1430void AliPythia::AtlasTuningMC09()
1431{
1432 //
1433 // Configuration for the ATLAS tuning
1434 if (fItune > -1) return;
1435 printf("ATLAS New TUNE MC09\n");
1436 SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
1437 SetMSTP(82, 4); // Double Gaussian Model
1438 SetMSTP(52, 2); // External PDF
1439 SetMSTP(51, 20650); // MRST LO*
1440
1441
1442 SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
1443 SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
1444 SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
1445 SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
1446
1447 SetPARP(78, 0.3); // the amount of color reconnection in the final state
1448 SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
1449 SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
1450 SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
1451 SetPARP(84, 0.7); // Core radius
1452 SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
1453 SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
1454
1455 SetMSTP(95, 6);
1456 SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
1457 SetPARJ(42, 0.58);
1458 SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
1459 SetPARP(89,1800.); // [GeV] Ref. energy
1460}
1461
1462AliPythia& AliPythia::operator=(const AliPythia& rhs)
1463{
1464// Assignment operator
1465 rhs.Copy(*this);
1466 return *this;
1467}
1468
1469 void AliPythia::Copy(TObject&) const
1470{
1471 //
1472 // Copy
1473 //
1474 Fatal("Copy","Not implemented!\n");
1475}
1476
1477void AliPythia::DalitzDecays()
1478{
1479
1480 //
1481 // Replace all omega dalitz decays with the correct matrix element decays
1482 //
1483 Int_t nt = fPyjets->N;
1484 for (Int_t i = 0; i < nt; i++) {
1485 if (fPyjets->K[1][i] != 223) continue;
1486 Int_t fd = fPyjets->K[3][i] - 1;
1487 Int_t ld = fPyjets->K[4][i] - 1;
1488 if (fd < 0) continue;
1489 if ((ld - fd) != 2) continue;
1490 if ((fPyjets->K[1][fd] != 111) ||
1491 ((TMath::Abs(fPyjets->K[1][fd+1]) != 11) && (TMath::Abs(fPyjets->K[1][fd+1]) != 13)))
1492 continue;
1493 TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1494 Int_t pdg = TMath::Abs(fPyjets->K[1][fd+1]);
1495 fOmegaDalitz.Decay(pdg, &omega);
1496 for (Int_t j = 0; j < 3; j++) {
1497 for (Int_t k = 0; k < 4; k++) {
1498 TLorentzVector vec = (fOmegaDalitz.Products())[2-j];
1499 fPyjets->P[k][fd+j] = vec[k];
1500 }
1501 }
1502 }
1503}