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Moving required CMake version from 2.8.4 to 2.8.8
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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// Pythia 6 interface used by AliGenPythia
17// Some settings are done by AliGenPythia, others here :)
18//
19/* $Id$ */
20
21#include "AliPythia.h"
22#include "AliPythiaRndm.h"
23#include "AliFastGlauber.h"
24#include "AliQuenchingWeights.h"
25#include "AliOmegaDalitz.h"
26#include "AliDecayerExodus.h"
27#include "AliLog.h"
28#include "TVector3.h"
29#include "TLorentzVector.h"
30#include "PyquenCommon.h"
31
32ClassImp(AliPythia)
33
34#ifndef WIN32
35# define pyclus pyclus_
36# define pycell pycell_
37# define pyshow pyshow_
38# define pyrobo pyrobo_
39# define pyquen pyquen_
40# define pyevnw pyevnw_
41# define pyshowq pyshowq_
42# define qpygin0 qpygin0_
43# define pytune pytune_
44# define py2ent py2ent_
45# define setpowwght setpowwght_
46# define type_of_call
47#else
48# define pyclus PYCLUS
49# define pycell PYCELL
50# define pyrobo PYROBO
51# define pyquen PYQUEN
52# define pyevnw PYEVNW
53# define pyshowq PYSHOWQ
54# define qpygin0 QPYGIN0
55# define pytune PYTUNE
56# define py2ent PY2ENT
57# define setpowwght SETPOWWGHT
58# define type_of_call _stdcall
59#endif
60
61extern "C" void type_of_call pyclus(Int_t & );
62extern "C" void type_of_call pycell(Int_t & );
63extern "C" void type_of_call pyshow(Int_t &, Int_t &, Double_t &);
64extern "C" void type_of_call pyrobo(Int_t &, Int_t &, Double_t &, Double_t &, Double_t &, Double_t &, Double_t &);
65extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
66extern "C" void type_of_call pyevnw();
67extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
68extern "C" void type_of_call pytune(Int_t &);
69extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
70extern "C" void type_of_call qpygin0();
71extern "C" void type_of_call setpowwght(Double_t &);
72//_____________________________________________________________________________
73
74AliPythia* AliPythia::fgAliPythia=NULL;
75
76AliPythia::AliPythia():
77 fProcess(kPyMb),
78 fEcms(0.),
79 fStrucFunc(kCTEQ5L),
80 fProjectile("p"),
81 fTarget("p"),
82 fXJet(0.),
83 fYJet(0.),
84 fNGmax(30),
85 fZmax(0.97),
86 fGlauber(0),
87 fQuenchingWeights(0),
88 fItune(-1),
89 fOmegaDalitz(),
90 fExodus()
91{
92// Default Constructor
93//
94// Set random number
95 if (!AliPythiaRndm::GetPythiaRandom())
96 AliPythiaRndm::SetPythiaRandom(GetRandom());
97 fGlauber = 0;
98 fQuenchingWeights = 0;
99 Int_t i = 0;
100 for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
101 for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
102 for (i = 0; i < 4; i++) fZQuench[i] = 0;
103}
104
105AliPythia::AliPythia(const AliPythia& pythia):
106 TPythia6(pythia),
107 AliRndm(pythia),
108 fProcess(kPyMb),
109 fEcms(0.),
110 fStrucFunc(kCTEQ5L),
111 fProjectile("p"),
112 fTarget("p"),
113 fXJet(0.),
114 fYJet(0.),
115 fNGmax(30),
116 fZmax(0.97),
117 fGlauber(0),
118 fQuenchingWeights(0),
119 fItune(-1),
120 fOmegaDalitz(),
121 fExodus()
122{
123 // Copy Constructor
124 Int_t i;
125 for (i = 0; i < 501; i++) fDefMDCY[i] = 0;
126 for (i = 0; i < 2001; i++) fDefMDME[i] = 0;
127 for (i = 0; i < 4; i++) fZQuench[i] = 0;
128 pythia.Copy(*this);
129}
130
131void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
132{
133// Initialise the process to generate
134 if (!AliPythiaRndm::GetPythiaRandom())
135 AliPythiaRndm::SetPythiaRandom(GetRandom());
136
137 fItune = itune;
138
139 fProcess = process;
140 fEcms = energy;
141 fStrucFunc = strucfunc;
142//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
143 SetMDCY(Pycomp(111) ,1,0); // pi0
144 SetMDCY(Pycomp(310) ,1,0); // K0S
145 SetMDCY(Pycomp(3122),1,0); // kLambda
146 SetMDCY(Pycomp(3112),1,0); // sigma -
147 SetMDCY(Pycomp(3222),1,0); // sigma +
148 SetMDCY(Pycomp(3312),1,0); // xi -
149 SetMDCY(Pycomp(3322),1,0); // xi 0
150 SetMDCY(Pycomp(3334),1,0); // omega-
151 // Select structure function
152 SetMSTP(52,2);
153 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
154 // Particles produced in string fragmentation point directly to either of the two endpoints
155 // of the string (depending in the side they were generated from).
156 SetMSTU(16,2);
157
158//
159// Pythia initialisation for selected processes//
160//
161// Make MSEL clean
162//
163 for (Int_t i=1; i<= 200; i++) {
164 SetMSUB(i,0);
165 }
166// select charm production
167 switch (process)
168 {
169 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
170// Multiple interactions on.
171 SetMSTP(81,1);
172// Double Gaussian matter distribution.
173 SetMSTP(82,4);
174 SetPARP(83,0.5);
175 SetPARP(84,0.4);
176// pT0.
177 SetPARP(82,2.0);
178// Reference energy for pT0 and energy rescaling pace.
179 SetPARP(89,1800);
180 SetPARP(90,0.25);
181// String drawing almost completely minimizes string length.
182 SetPARP(85,0.9);
183 SetPARP(86,0.95);
184// ISR and FSR activity.
185 SetPARP(67,4);
186 SetPARP(71,4);
187// Lambda_FSR scale.
188 SetPARJ(81,0.29);
189 break;
190 case kPyOldUEQ2ordered2:
191// Old underlying events with Q2 ordered QCD processes
192// Multiple interactions on.
193 SetMSTP(81,1);
194// Double Gaussian matter distribution.
195 SetMSTP(82,4);
196 SetPARP(83,0.5);
197 SetPARP(84,0.4);
198// pT0.
199 SetPARP(82,2.0);
200// Reference energy for pT0 and energy rescaling pace.
201 SetPARP(89,1800);
202 SetPARP(90,0.16); // here is the difference with kPyOldUEQ2ordered
203// String drawing almost completely minimizes string length.
204 SetPARP(85,0.9);
205 SetPARP(86,0.95);
206// ISR and FSR activity.
207 SetPARP(67,4);
208 SetPARP(71,4);
209// Lambda_FSR scale.
210 SetPARJ(81,0.29);
211 break;
212 case kPyOldPopcorn:
213// Old production mechanism: Old Popcorn
214 SetMSEL(1);
215 SetMSTJ(12,3);
216// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
217 SetMSTP(88,2);
218// (D=1)see can be used to form baryons (BARYON JUNCTION)
219 SetMSTJ(1,1);
220 AtlasTuning();
221 break;
222 case kPyCharm:
223 SetMSEL(4);
224// heavy quark masses
225
226 SetPMAS(4,1,1.2);
227//
228// primordial pT
229 SetMSTP(91,1);
230 SetPARP(91,1.);
231 SetPARP(93,5.);
232//
233 break;
234 case kPyBeauty:
235 SetMSEL(5);
236 SetPMAS(5,1,4.75);
237 break;
238 case kPyJpsi:
239 SetMSEL(0);
240// gg->J/Psi g
241 SetMSUB(86,1);
242 break;
243 case kPyJpsiChi:
244 SetMSEL(0);
245// gg->J/Psi g
246 SetMSUB(86,1);
247// gg-> chi_0c g
248 SetMSUB(87,1);
249// gg-> chi_1c g
250 SetMSUB(88,1);
251// gg-> chi_2c g
252 SetMSUB(89,1);
253 break;
254 case kPyCharmUnforced:
255 SetMSEL(0);
256// gq->qg
257 SetMSUB(28,1);
258// gg->qq
259 SetMSUB(53,1);
260// gg->gg
261 SetMSUB(68,1);
262 break;
263 case kPyBeautyUnforced:
264 SetMSEL(0);
265// gq->qg
266 SetMSUB(28,1);
267// gg->qq
268 SetMSUB(53,1);
269// gg->gg
270 SetMSUB(68,1);
271 break;
272 case kPyMb:
273// Minimum Bias pp-Collisions
274//
275//
276// select Pythia min. bias model
277 SetMSEL(0);
278 SetMSUB(92,1); // single diffraction AB-->XB
279 SetMSUB(93,1); // single diffraction AB-->AX
280 SetMSUB(94,1); // double diffraction
281 SetMSUB(95,1); // low pt production
282
283 AtlasTuning();
284 break;
285
286 case kPyMbAtlasTuneMC09:
287// Minimum Bias pp-Collisions
288//
289//
290// select Pythia min. bias model
291 SetMSEL(0);
292 SetMSUB(92,1); // single diffraction AB-->XB
293 SetMSUB(93,1); // single diffraction AB-->AX
294 SetMSUB(94,1); // double diffraction
295 SetMSUB(95,1); // low pt production
296
297 AtlasTuningMC09();
298 break;
299
300 case kPyMbWithDirectPhoton:
301// Minimum Bias pp-Collisions with direct photon processes added
302//
303//
304// select Pythia min. bias model
305 SetMSEL(0);
306 SetMSUB(92,1); // single diffraction AB-->XB
307 SetMSUB(93,1); // single diffraction AB-->AX
308 SetMSUB(94,1); // double diffraction
309 SetMSUB(95,1); // low pt production
310
311 SetMSUB(14,1); //
312 SetMSUB(18,1); //
313 SetMSUB(29,1); //
314 SetMSUB(114,1); //
315 SetMSUB(115,1); //
316
317
318 AtlasTuning();
319 break;
320
321 case kPyMbDefault:
322// Minimum Bias pp-Collisions
323//
324//
325// select Pythia min. bias model
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 break;
332 case kPyLhwgMb:
333// Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
334// -> Pythia 6.3 or above is needed
335//
336 SetMSEL(0);
337 SetMSUB(92,1); // single diffraction AB-->XB
338 SetMSUB(93,1); // single diffraction AB-->AX
339 SetMSUB(94,1); // double diffraction
340 SetMSUB(95,1); // low pt production
341
342 SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
343 SetMSTP(52,2);
344 SetMSTP(68,1);
345 SetMSTP(70,2);
346 SetMSTP(81,1); // Multiple Interactions ON
347 SetMSTP(82,4); // Double Gaussian Model
348 SetMSTP(88,1);
349
350 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
351 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
352 SetPARP(84,0.5); // Core radius
353 SetPARP(85,0.9); // Regulates gluon prod. mechanism
354 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
355
356 break;
357 case kPyMbNonDiffr:
358// Minimum Bias pp-Collisions
359//
360//
361// select Pythia min. bias model
362 SetMSEL(0);
363 SetMSUB(95,1); // low pt production
364
365 AtlasTuning();
366 break;
367 case kPyMbMSEL1:
368 ConfigHeavyFlavor();
369// Intrinsic <kT^2>
370 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
371 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
372 SetPARP(93,5.); // Upper cut-off
373// Set Q-quark mass
374 SetPMAS(4,1,1.2); // Charm quark mass
375 SetPMAS(5,1,4.78); // Beauty quark mass
376 SetPARP(71,4.); // Defaut value
377// Atlas Tuning
378 AtlasTuning();
379 break;
380 case kPyJets:
381//
382// QCD Jets
383//
384 SetMSEL(1);
385
386 // Pythia Tune A (CDF)
387 //
388 if (fItune < 0) {
389 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
390 SetMSTP(82,4); // Double Gaussian Model
391 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
392 SetPARP(84,0.4); // Core radius
393 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
394 SetPARP(86,0.95); // Regulates gluon prod. mechanism
395 SetPARP(89,1800.); // [GeV] Ref. energy
396 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
397 }
398 break;
399 case kPyDirectGamma:
400 SetMSEL(10);
401 break;
402 case kPyCharmPbPbMNR:
403 case kPyD0PbPbMNR:
404 case kPyDPlusPbPbMNR:
405 case kPyDPlusStrangePbPbMNR:
406 // Tuning of Pythia parameters aimed to get a resonable agreement
407 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
408 // c-cbar single inclusive and double differential distributions.
409 // This parameter settings are meant to work with Pb-Pb collisions
410 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
411 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
412 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
413 ConfigHeavyFlavor();
414 // Intrinsic <kT>
415 SetMSTP(91,1);
416 SetPARP(91,1.304);
417 SetPARP(93,6.52);
418 // Set c-quark mass
419 SetPMAS(4,1,1.2);
420 break;
421 case kPyCharmpPbMNR:
422 case kPyD0pPbMNR:
423 case kPyDPluspPbMNR:
424 case kPyDPlusStrangepPbMNR:
425 // Tuning of Pythia parameters aimed to get a resonable agreement
426 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
427 // c-cbar single inclusive and double differential distributions.
428 // This parameter settings are meant to work with p-Pb collisions
429 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
430 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
431 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
432 ConfigHeavyFlavor();
433 // Intrinsic <kT>
434 SetMSTP(91,1);
435 SetPARP(91,1.16);
436 SetPARP(93,5.8);
437
438 // Set c-quark mass
439 SetPMAS(4,1,1.2);
440 break;
441 case kPyCharmppMNR:
442 case kPyD0ppMNR:
443 case kPyDPlusppMNR:
444 case kPyDPlusStrangeppMNR:
445 case kPyLambdacppMNR:
446 // Tuning of Pythia parameters aimed to get a resonable agreement
447 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
448 // c-cbar single inclusive and double differential distributions.
449 // This parameter settings are meant to work with pp collisions
450 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
451 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
452 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
453 ConfigHeavyFlavor();
454 // Intrinsic <kT^2>
455 SetMSTP(91,1);
456 SetPARP(91,1.);
457 SetPARP(93,5.);
458
459 // Set c-quark mass
460 SetPMAS(4,1,1.2);
461 break;
462 case kPyCharmppMNRwmi:
463 // Tuning of Pythia parameters aimed to get a resonable agreement
464 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
465 // c-cbar single inclusive and double differential distributions.
466 // This parameter settings are meant to work with pp collisions
467 // and with kCTEQ5L PDFs.
468 // Added multiple interactions according to ATLAS tune settings.
469 // To get a "reasonable" agreement with MNR results, events have to be
470 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
471 // set to 2.76 GeV.
472 // To get a "perfect" agreement with MNR results, events have to be
473 // generated in four ptHard bins with the following relative
474 // normalizations:
475 // 2.76-3 GeV: 25%
476 // 3-4 GeV: 40%
477 // 4-8 GeV: 29%
478 // >8 GeV: 6%
479 ConfigHeavyFlavor();
480 // Intrinsic <kT^2>
481 SetMSTP(91,1);
482 SetPARP(91,1.);
483 SetPARP(93,5.);
484
485 // Set c-quark mass
486 SetPMAS(4,1,1.2);
487 AtlasTuning();
488 break;
489 case kPyBeautyPbPbMNR:
490 // Tuning of Pythia parameters aimed to get a resonable agreement
491 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
492 // b-bbar single inclusive and double differential distributions.
493 // This parameter settings are meant to work with Pb-Pb collisions
494 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
495 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
496 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
497 ConfigHeavyFlavor();
498 // QCD scales
499 SetPARP(67,1.0);
500 SetPARP(71,1.0);
501 // Intrinsic <kT>
502 SetMSTP(91,1);
503 SetPARP(91,2.035);
504 SetPARP(93,10.17);
505 // Set b-quark mass
506 SetPMAS(5,1,4.75);
507 break;
508 case kPyBeautypPbMNR:
509 // Tuning of Pythia parameters aimed to get a resonable agreement
510 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
511 // b-bbar single inclusive and double differential distributions.
512 // This parameter settings are meant to work with p-Pb collisions
513 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
514 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
515 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
516 ConfigHeavyFlavor();
517 // QCD scales
518 SetPARP(67,1.0);
519 SetPARP(71,1.0);
520 // Intrinsic <kT>
521 SetMSTP(91,1);
522 SetPARP(91,1.60);
523 SetPARP(93,8.00);
524 // Set b-quark mass
525 SetPMAS(5,1,4.75);
526 break;
527 case kPyBeautyppMNR:
528 // Tuning of Pythia parameters aimed to get a resonable agreement
529 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
530 // b-bbar single inclusive and double differential distributions.
531 // This parameter settings are meant to work with pp collisions
532 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
533 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
534 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
535 ConfigHeavyFlavor();
536 // QCD scales
537 SetPARP(67,1.0);
538 SetPARP(71,1.0);
539
540 // Intrinsic <kT>
541 SetMSTP(91,1);
542 SetPARP(91,1.);
543 SetPARP(93,5.);
544
545 // Set b-quark mass
546 SetPMAS(5,1,4.75);
547 break;
548 case kPyBeautyJets:
549 case kPyBeautyppMNRwmi:
550 // Tuning of Pythia parameters aimed to get a resonable agreement
551 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
552 // b-bbar single inclusive and double differential distributions.
553 // This parameter settings are meant to work with pp collisions
554 // and with kCTEQ5L PDFs.
555 // Added multiple interactions according to ATLAS tune settings.
556 // To get a "reasonable" agreement with MNR results, events have to be
557 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
558 // set to 2.76 GeV.
559 // To get a "perfect" agreement with MNR results, events have to be
560 // generated in four ptHard bins with the following relative
561 // normalizations:
562 // 2.76-4 GeV: 5%
563 // 4-6 GeV: 31%
564 // 6-8 GeV: 28%
565 // >8 GeV: 36%
566 ConfigHeavyFlavor();
567 // QCD scales
568 SetPARP(67,1.0);
569 SetPARP(71,1.0);
570
571 // Intrinsic <kT>
572 SetMSTP(91,1);
573 SetPARP(91,1.);
574 SetPARP(93,5.);
575
576 // Set b-quark mass
577 SetPMAS(5,1,4.75);
578
579 AtlasTuning();
580 break;
581 case kPyW:
582
583 //Inclusive production of W+/-
584 SetMSEL(0);
585 //f fbar -> W+
586 SetMSUB(2,1);
587 // //f fbar -> g W+
588 // SetMSUB(16,1);
589 // //f fbar -> gamma W+
590 // SetMSUB(20,1);
591 // //f g -> f W+
592 // SetMSUB(31,1);
593 // //f gamma -> f W+
594 // SetMSUB(36,1);
595
596 // Initial/final parton shower on (Pythia default)
597 // With parton showers on we are generating "W inclusive process"
598 SetMSTP(61,1); //Initial QCD & QED showers on
599 SetMSTP(71,1); //Final QCD & QED showers on
600
601 break;
602
603 case kPyZ:
604
605 //Inclusive production of Z
606 SetMSEL(0);
607 //f fbar -> Z/gamma
608 SetMSUB(1,1);
609
610 // // f fbar -> g Z/gamma
611 // SetMSUB(15,1);
612 // // f fbar -> gamma Z/gamma
613 // SetMSUB(19,1);
614 // // f g -> f Z/gamma
615 // SetMSUB(30,1);
616 // // f gamma -> f Z/gamma
617 // SetMSUB(35,1);
618
619 //only Z included, not gamma
620 SetMSTP(43,2);
621
622 // Initial/final parton shower on (Pythia default)
623 // With parton showers on we are generating "Z inclusive process"
624 SetMSTP(61,1); //Initial QCD & QED showers on
625 SetMSTP(71,1); //Final QCD & QED showers on
626
627 break;
628 case kPyZgamma:
629 //Inclusive production of Z
630 SetMSEL(0);
631 //f fbar -> Z/gamma
632 SetMSUB(1,1);
633 // Initial/final parton shower on (Pythia default)
634 // With parton showers on we are generating "Z inclusive process"
635 SetMSTP(61,1); //Initial QCD & QED showers on
636 SetMSTP(71,1); //Final QCD & QED showers on
637 break;
638 case kPyMBRSingleDiffraction:
639 case kPyMBRDoubleDiffraction:
640 case kPyMBRCentralDiffraction:
641 break;
642 case kPyJetsPWHG:
643 // N.B.
644 // ====
645 // For the case of jet production the following parameter setting
646 // limits the transverse momentum of secondary scatterings, due
647 // to multiple parton interactions, to be less than that of the
648 // primary interaction (see POWHEG Dijet paper arXiv:1012.3380
649 // [hep-ph] sec. 4.1 and also the PYTHIA Manual).
650 SetMSTP(86,1);
651
652 // maximum number of errors before pythia aborts (def=10)
653 SetMSTU(22,10);
654 // number of warnings printed on the shell
655 SetMSTU(26,20);
656 break;
657
658 case kPyCharmPWHG:
659 case kPyBeautyPWHG:
660 case kPyWPWHG:
661 // number of warnings printed on the shell
662 SetMSTU(26,20);
663
664 break;
665 }
666//
667// Initialize PYTHIA
668//
669// Select the tune
670 if (itune > -1) {
671 Pytune(itune);
672 if (GetMSTP(192) > 1 || GetMSTP(193) > 1) {
673 AliWarning(Form("Structure function for tune %5d set to %5s\n",
674 itune, AliStructFuncType::PDFsetName(strucfunc).Data()));
675 SetMSTP(52,2);
676 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
677 }
678 }
679//
680 SetMSTP(41,1); // all resonance decays switched on
681 if (process == kPyJetsPWHG || process == kPyCharmPWHG || process == kPyBeautyPWHG || process == kPyWPWHG) {
682 Initialize("USER","","",0.);
683 } else {
684 Initialize("CMS",fProjectile,fTarget,fEcms);
685 }
686 fOmegaDalitz.Init();
687 fExodus.Init();
688}
689
690Int_t AliPythia::CheckedLuComp(Int_t kf)
691{
692// Check Lund particle code (for debugging)
693 Int_t kc=Pycomp(kf);
694 printf("\n Lucomp kf,kc %d %d",kf,kc);
695 return kc;
696}
697
698void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
699{
700// Treat protons as inside nuclei with mass numbers a1 and a2
701// The MSTP array in the PYPARS common block is used to enable and
702// select the nuclear structure functions.
703// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
704// =1: internal PYTHIA acording to MSTP(51)
705// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
706// If the following mass number both not equal zero, nuclear corrections of the stf are used.
707// MSTP(192) : Mass number of nucleus side 1
708// MSTP(193) : Mass number of nucleus side 2
709// MSTP(194) : Nuclear structure function: 0: EKS98 8:EPS08 9:EPS09LO 19:EPS09NLO
710 SetMSTP(52,2);
711 SetMSTP(192, a1);
712 SetMSTP(193, a2);
713 SetMSTP(194, pdf);
714}
715
716
717AliPythia* AliPythia::Instance()
718{
719// Set random number generator
720 if (fgAliPythia) {
721 return fgAliPythia;
722 } else {
723 fgAliPythia = new AliPythia();
724 return fgAliPythia;
725 }
726}
727
728void AliPythia::PrintParticles()
729{
730// Print list of particl properties
731 Int_t np = 0;
732 char* name = new char[16];
733 for (Int_t kf=0; kf<1000000; kf++) {
734 for (Int_t c = 1; c > -2; c-=2) {
735 Int_t kc = Pycomp(c*kf);
736 if (kc) {
737 Float_t mass = GetPMAS(kc,1);
738 Float_t width = GetPMAS(kc,2);
739 Float_t tau = GetPMAS(kc,4);
740
741 Pyname(kf,name);
742
743 np++;
744
745 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
746 c*kf, name, mass, width, tau);
747 }
748 }
749 }
750 printf("\n Number of particles %d \n \n", np);
751}
752
753void AliPythia::ResetDecayTable()
754{
755// Set default values for pythia decay switches
756 Int_t i;
757 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
758 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
759}
760
761void AliPythia::SetDecayTable()
762{
763// Set default values for pythia decay switches
764//
765 Int_t i;
766 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
767 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
768}
769
770void AliPythia::Pyclus(Int_t& njet)
771{
772// Call Pythia clustering algorithm
773//
774 pyclus(njet);
775}
776
777void AliPythia::Pycell(Int_t& njet)
778{
779// Call Pythia jet reconstruction algorithm
780//
781 pycell(njet);
782}
783
784void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
785{
786// Call Pythia jet reconstruction algorithm
787//
788 pyshow(ip1, ip2, qmax);
789}
790
791void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
792{
793 pyrobo(imi, ima, the, phi, bex, bey, bez);
794}
795
796void AliPythia::Pytune(Int_t itune)
797{
798/*
799C
800C ITUNE NAME (detailed descriptions below)
801C 0 Default : No settings changed => linked Pythia version's defaults.
802C ====== Old UE, Q2-ordered showers ==========================================
803C 100 A : Rick Field's CDF Tune A
804C 101 AW : Rick Field's CDF Tune AW
805C 102 BW : Rick Field's CDF Tune BW
806C 103 DW : Rick Field's CDF Tune DW
807C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
808C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
809C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
810C 107 ACR : Tune A modified with annealing CR
811C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
812C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
813C ====== Intermediate Models =================================================
814C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
815C 201 APT : Tune A modified to use pT-ordered final-state showers
816C ====== New UE, interleaved pT-ordered showers, annealing CR ================
817C 300 S0 : Sandhoff-Skands Tune 0
818C 301 S1 : Sandhoff-Skands Tune 1
819C 302 S2 : Sandhoff-Skands Tune 2
820C 303 S0A : S0 with "Tune A" UE energy scaling
821C 304 NOCR : New UE "best try" without colour reconnections
822C 305 Old : New UE, original (primitive) colour reconnections
823C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
824C ======= The Uppsala models =================================================
825C ( NB! must be run with special modified Pythia 6.215 version )
826C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
827C 400 GAL 0 : Generalized area-law model. Old parameters
828C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
829C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
830*/
831 pytune(itune);
832}
833
834void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
835 // Inset 2-parton system at line idx
836 py2ent(idx, pdg1, pdg2, p);
837}
838
839void AliPythia::SetWeightPower(Double_t pow)
840{
841 setpowwght(pow);
842 SetMSTP(142, 1); // Tell Pythia to use pyevwt to calculate event wghts
843 if (GetCKIN(3) <= 0)
844 AliWarning("Need to set minimum p_T,hard to nonzero value for weighted event generation");
845}
846
847void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
848{
849// Initializes
850// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
851// (2) The nuclear geometry using the Glauber Model
852//
853
854 fGlauber = AliFastGlauber::Instance();
855 fGlauber->Init(2);
856 fGlauber->SetCentralityClass(cMin, cMax);
857
858 fQuenchingWeights = new AliQuenchingWeights();
859 fQuenchingWeights->InitMult();
860 fQuenchingWeights->SetK(k);
861 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
862 fNGmax = ngmax;
863 fZmax = zmax;
864
865}
866
867
868void AliPythia::Quench()
869{
870//
871//
872// Simple Jet Quenching routine:
873// =============================
874// The jet formed by all final state partons radiated by the parton created
875// in the hard collisions is quenched by a factor (1-z) using light cone variables in
876// the initial parton reference frame:
877// (E + p_z)new = (1-z) (E + p_z)old
878//
879//
880//
881//
882// The lost momentum is first balanced by one gluon with virtuality > 0.
883// Subsequently the gluon splits to yield two gluons with E = p.
884//
885//
886//
887 static Float_t eMean = 0.;
888 static Int_t icall = 0;
889
890 Double_t p0[4][5];
891 Double_t p1[4][5];
892 Double_t p2[4][5];
893 Int_t klast[4] = {-1, -1, -1, -1};
894
895 Int_t numpart = fPyjets->N;
896 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
897 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
898 Bool_t quenched[4];
899 Double_t wjtKick[4] = {0., 0., 0., 0.};
900 Int_t nGluon[4];
901 Int_t qPdg[4];
902 Int_t imo, kst, pdg;
903
904//
905// Sore information about Primary partons
906//
907// j =
908// 0, 1 partons from hard scattering
909// 2, 3 partons from initial state radiation
910//
911 for (Int_t i = 2; i <= 7; i++) {
912 Int_t j = 0;
913 // Skip gluons that participate in hard scattering
914 if (i == 4 || i == 5) continue;
915 // Gluons from hard Scattering
916 if (i == 6 || i == 7) {
917 j = i - 6;
918 pxq[j] = fPyjets->P[0][i];
919 pyq[j] = fPyjets->P[1][i];
920 pzq[j] = fPyjets->P[2][i];
921 eq[j] = fPyjets->P[3][i];
922 mq[j] = fPyjets->P[4][i];
923 } else {
924 // Gluons from initial state radiation
925 //
926 // Obtain 4-momentum vector from difference between original parton and parton after gluon
927 // radiation. Energy is calculated independently because initial state radition does not
928 // conserve strictly momentum and energy for each partonic system independently.
929 //
930 // Not very clean. Should be improved !
931 //
932 //
933 j = i;
934 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
935 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
936 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
937 mq[j] = fPyjets->P[4][i];
938 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
939 }
940//
941// Calculate some kinematic variables
942//
943 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
944 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
945 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
946 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
947 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
948 qPdg[j] = fPyjets->K[1][i];
949 }
950
951 Double_t int0[4];
952 Double_t int1[4];
953
954 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
955
956 for (Int_t j = 0; j < 4; j++) {
957 //
958 // Quench only central jets and with E > 10.
959 //
960
961
962 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
963 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
964
965 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
966 fZQuench[j] = 0.;
967 } else {
968 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
969 icall ++;
970 eMean += eloss;
971 }
972 //
973 // Extra pt
974 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
975 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
976 //
977 // Fractional energy loss
978 fZQuench[j] = eloss / eq[j];
979 //
980 // Avoid complete loss
981 //
982 if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
983 //
984 // Some debug printing
985
986
987// 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",
988// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
989
990// fZQuench[j] = 0.8;
991// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
992 }
993
994 quenched[j] = (fZQuench[j] > 0.01);
995 } // primary partons
996
997
998
999 Double_t pNew[1000][4];
1000 Int_t kNew[1000];
1001 Int_t icount = 0;
1002 Double_t zquench[4];
1003
1004//
1005// System Loop
1006 for (Int_t isys = 0; isys < 4; isys++) {
1007// Skip to next system if not quenched.
1008 if (!quenched[isys]) continue;
1009
1010 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
1011 if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
1012 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
1013 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
1014
1015
1016
1017 Int_t igMin = -1;
1018 Int_t igMax = -1;
1019 Double_t pg[4] = {0., 0., 0., 0.};
1020
1021//
1022// Loop on radiation events
1023
1024 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
1025 while (1) {
1026 icount = 0;
1027 for (Int_t k = 0; k < 4; k++)
1028 {
1029 p0[isys][k] = 0.;
1030 p1[isys][k] = 0.;
1031 p2[isys][k] = 0.;
1032 }
1033// Loop over partons
1034 for (Int_t i = 0; i < numpart; i++)
1035 {
1036 imo = fPyjets->K[2][i];
1037 kst = fPyjets->K[0][i];
1038 pdg = fPyjets->K[1][i];
1039
1040
1041
1042// Quarks and gluons only
1043 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
1044// Particles from hard scattering only
1045
1046 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
1047 Int_t imom = imo % 1000;
1048 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
1049 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
1050
1051
1052// Skip comment lines
1053 if (kst != 1 && kst != 2) continue;
1054//
1055// Parton kinematic
1056 px = fPyjets->P[0][i];
1057 py = fPyjets->P[1][i];
1058 pz = fPyjets->P[2][i];
1059 e = fPyjets->P[3][i];
1060 m = fPyjets->P[4][i];
1061 pt = TMath::Sqrt(px * px + py * py);
1062 p = TMath::Sqrt(px * px + py * py + pz * pz);
1063 phi = TMath::Pi() + TMath::ATan2(-py, -px);
1064 theta = TMath::ATan2(pt, pz);
1065
1066//
1067// Save 4-momentum sum for balancing
1068 Int_t index = isys;
1069
1070 p0[index][0] += px;
1071 p0[index][1] += py;
1072 p0[index][2] += pz;
1073 p0[index][3] += e;
1074
1075 klast[index] = i;
1076
1077//
1078// Fractional energy loss
1079 Double_t z = zquench[index];
1080
1081
1082// Don't fully quench radiated gluons
1083//
1084 if (imo > 1000) {
1085// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
1086//
1087
1088 z = 0.02;
1089 }
1090// printf("z: %d %f\n", imo, z);
1091
1092
1093//
1094
1095 //
1096 //
1097 // Transform into frame in which initial parton is along z-axis
1098 //
1099 TVector3 v(px, py, pz);
1100 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
1101 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
1102
1103 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
1104 Double_t mt2 = jt * jt + m * m;
1105 Double_t zmax = 1.;
1106 //
1107 // Kinematic limit on z
1108 //
1109 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
1110 //
1111 // Change light-cone kinematics rel. to initial parton
1112 //
1113 Double_t eppzOld = e + pl;
1114 Double_t empzOld = e - pl;
1115
1116 Double_t eppzNew = (1. - z) * eppzOld;
1117 Double_t empzNew = empzOld - mt2 * z / eppzOld;
1118 Double_t eNew = 0.5 * (eppzNew + empzNew);
1119 Double_t plNew = 0.5 * (eppzNew - empzNew);
1120
1121 Double_t jtNew;
1122 //
1123 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
1124 Double_t mt2New = eppzNew * empzNew;
1125 if (mt2New < 1.e-8) mt2New = 0.;
1126 if (z < zmax) {
1127 if (m * m > mt2New) {
1128 //
1129 // This should not happen
1130 //
1131 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
1132 jtNew = 0;
1133 } else {
1134 jtNew = TMath::Sqrt(mt2New - m * m);
1135 }
1136 } else {
1137 // If pT is to small (probably a leading massive particle) we scale only the energy
1138 // This can cause negative masses of the radiated gluon
1139 // Let's hope for the best ...
1140 jtNew = jt;
1141 eNew = TMath::Sqrt(plNew * plNew + mt2);
1142
1143 }
1144 //
1145 // Calculate new px, py
1146 //
1147 Double_t pxNew = 0;
1148 Double_t pyNew = 0;
1149
1150 if (jt>0) {
1151 pxNew = jtNew / jt * pxs;
1152 pyNew = jtNew / jt * pys;
1153 }
1154// Double_t dpx = pxs - pxNew;
1155// Double_t dpy = pys - pyNew;
1156// Double_t dpz = pl - plNew;
1157// Double_t de = e - eNew;
1158// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
1159// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
1160// printf("New mass (2) %e %e \n", pxNew, pyNew);
1161 //
1162 // Rotate back
1163 //
1164 TVector3 w(pxNew, pyNew, plNew);
1165 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
1166 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
1167
1168 p1[index][0] += pxNew;
1169 p1[index][1] += pyNew;
1170 p1[index][2] += plNew;
1171 p1[index][3] += eNew;
1172 //
1173 // Updated 4-momentum vectors
1174 //
1175 pNew[icount][0] = pxNew;
1176 pNew[icount][1] = pyNew;
1177 pNew[icount][2] = plNew;
1178 pNew[icount][3] = eNew;
1179 kNew[icount] = i;
1180 icount++;
1181 } // parton loop
1182 //
1183 // Check if there was phase-space for quenching
1184 //
1185
1186 if (icount == 0) quenched[isys] = kFALSE;
1187 if (!quenched[isys]) break;
1188
1189 for (Int_t j = 0; j < 4; j++)
1190 {
1191 p2[isys][j] = p0[isys][j] - p1[isys][j];
1192 }
1193 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];
1194 if (p2[isys][4] > 0.) {
1195 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1196 break;
1197 } else {
1198 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
1199 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]);
1200 if (p2[isys][4] < -0.01) {
1201 printf("Negative mass squared !\n");
1202 // Here we have to put the gluon back to mass shell
1203 // This will lead to a small energy imbalance
1204 p2[isys][4] = 0.;
1205 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1206 break;
1207 } else {
1208 p2[isys][4] = 0.;
1209 break;
1210 }
1211 }
1212 /*
1213 zHeavy *= 0.98;
1214 printf("zHeavy lowered to %f\n", zHeavy);
1215 if (zHeavy < 0.01) {
1216 printf("No success ! \n");
1217 icount = 0;
1218 quenched[isys] = kFALSE;
1219 break;
1220 }
1221 */
1222 } // iteration on z (while)
1223
1224// Update event record
1225 for (Int_t k = 0; k < icount; k++) {
1226// 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] );
1227 fPyjets->P[0][kNew[k]] = pNew[k][0];
1228 fPyjets->P[1][kNew[k]] = pNew[k][1];
1229 fPyjets->P[2][kNew[k]] = pNew[k][2];
1230 fPyjets->P[3][kNew[k]] = pNew[k][3];
1231 }
1232 //
1233 // Add the gluons
1234 //
1235 Int_t ish = 0;
1236 Int_t iGlu;
1237 if (!quenched[isys]) continue;
1238//
1239// Last parton from shower i
1240 Int_t in = klast[isys];
1241//
1242// Continue if no parton in shower i selected
1243 if (in == -1) continue;
1244//
1245// If this is the second initial parton and it is behind the first move pointer by previous ish
1246 if (isys == 1 && klast[1] > klast[0]) in += ish;
1247//
1248// Starting index
1249
1250// jmin = in - 1;
1251// How many additional gluons will be generated
1252 ish = 1;
1253 if (p2[isys][4] > 0.05) ish = 2;
1254//
1255// Position of gluons
1256 iGlu = numpart;
1257 if (iglu == 0) igMin = iGlu;
1258 igMax = iGlu;
1259 numpart += ish;
1260 (fPyjets->N) += ish;
1261
1262 if (ish == 1) {
1263 fPyjets->P[0][iGlu] = p2[isys][0];
1264 fPyjets->P[1][iGlu] = p2[isys][1];
1265 fPyjets->P[2][iGlu] = p2[isys][2];
1266 fPyjets->P[3][iGlu] = p2[isys][3];
1267 fPyjets->P[4][iGlu] = p2[isys][4];
1268
1269 fPyjets->K[0][iGlu] = 1;
1270 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
1271 fPyjets->K[1][iGlu] = 21;
1272 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1273 fPyjets->K[3][iGlu] = -1;
1274 fPyjets->K[4][iGlu] = -1;
1275
1276 pg[0] += p2[isys][0];
1277 pg[1] += p2[isys][1];
1278 pg[2] += p2[isys][2];
1279 pg[3] += p2[isys][3];
1280 } else {
1281 //
1282 // Split gluon in rest frame.
1283 //
1284 Double_t bx = p2[isys][0] / p2[isys][3];
1285 Double_t by = p2[isys][1] / p2[isys][3];
1286 Double_t bz = p2[isys][2] / p2[isys][3];
1287 Double_t pst = p2[isys][4] / 2.;
1288 //
1289 // Isotropic decay ????
1290 Double_t cost = 2. * gRandom->Rndm() - 1.;
1291 Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
1292 Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
1293
1294 Double_t pz1 = pst * cost;
1295 Double_t pz2 = -pst * cost;
1296 Double_t pt1 = pst * sint;
1297 Double_t pt2 = -pst * sint;
1298 Double_t px1 = pt1 * TMath::Cos(phis);
1299 Double_t py1 = pt1 * TMath::Sin(phis);
1300 Double_t px2 = pt2 * TMath::Cos(phis);
1301 Double_t py2 = pt2 * TMath::Sin(phis);
1302
1303 fPyjets->P[0][iGlu] = px1;
1304 fPyjets->P[1][iGlu] = py1;
1305 fPyjets->P[2][iGlu] = pz1;
1306 fPyjets->P[3][iGlu] = pst;
1307 fPyjets->P[4][iGlu] = 0.;
1308
1309 fPyjets->K[0][iGlu] = 1 ;
1310 fPyjets->K[1][iGlu] = 21;
1311 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
1312 fPyjets->K[3][iGlu] = -1;
1313 fPyjets->K[4][iGlu] = -1;
1314
1315 fPyjets->P[0][iGlu+1] = px2;
1316 fPyjets->P[1][iGlu+1] = py2;
1317 fPyjets->P[2][iGlu+1] = pz2;
1318 fPyjets->P[3][iGlu+1] = pst;
1319 fPyjets->P[4][iGlu+1] = 0.;
1320
1321 fPyjets->K[0][iGlu+1] = 1;
1322 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
1323 fPyjets->K[1][iGlu+1] = 21;
1324 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
1325 fPyjets->K[3][iGlu+1] = -1;
1326 fPyjets->K[4][iGlu+1] = -1;
1327 SetMSTU(1,0);
1328 SetMSTU(2,0);
1329 //
1330 // Boost back
1331 //
1332 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1333 }
1334/*
1335 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1336 Double_t px, py, pz;
1337 px = fPyjets->P[0][ig];
1338 py = fPyjets->P[1][ig];
1339 pz = fPyjets->P[2][ig];
1340 TVector3 v(px, py, pz);
1341 v.RotateZ(-phiq[isys]);
1342 v.RotateY(-thetaq[isys]);
1343 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1344 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1345 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1346 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1347 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1348 pxs += jtKick * TMath::Cos(phiKick);
1349 pys += jtKick * TMath::Sin(phiKick);
1350 TVector3 w(pxs, pys, pzs);
1351 w.RotateY(thetaq[isys]);
1352 w.RotateZ(phiq[isys]);
1353 fPyjets->P[0][ig] = w.X();
1354 fPyjets->P[1][ig] = w.Y();
1355 fPyjets->P[2][ig] = w.Z();
1356 fPyjets->P[2][ig] = w.Mag();
1357 }
1358*/
1359 } // kGluon
1360
1361
1362 // Check energy conservation
1363 Double_t pxs = 0.;
1364 Double_t pys = 0.;
1365 Double_t pzs = 0.;
1366 Double_t es = 14000.;
1367
1368 for (Int_t i = 0; i < numpart; i++)
1369 {
1370 kst = fPyjets->K[0][i];
1371 if (kst != 1 && kst != 2) continue;
1372 pxs += fPyjets->P[0][i];
1373 pys += fPyjets->P[1][i];
1374 pzs += fPyjets->P[2][i];
1375 es -= fPyjets->P[3][i];
1376 }
1377 if (TMath::Abs(pxs) > 1.e-2 ||
1378 TMath::Abs(pys) > 1.e-2 ||
1379 TMath::Abs(pzs) > 1.e-1) {
1380 printf("%e %e %e %e\n", pxs, pys, pzs, es);
1381// Fatal("Quench()", "4-Momentum non-conservation");
1382 }
1383
1384 } // end quenching loop (systems)
1385// Clean-up
1386 for (Int_t i = 0; i < numpart; i++)
1387 {
1388 imo = fPyjets->K[2][i];
1389 if (imo > 1000) {
1390 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1391 }
1392 }
1393// this->Pylist(1);
1394} // end quench
1395
1396
1397void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1398{
1399 // Igor Lokthine's quenching routine
1400 // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1401
1402 pyquen(a, ibf, b);
1403}
1404
1405void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1406{
1407 // Set the parameters for the PYQUEN package.
1408 // See comments in PyquenCommon.h
1409
1410
1411 PYQPAR.t0 = t0;
1412 PYQPAR.tau0 = tau0;
1413 PYQPAR.nf = nf;
1414 PYQPAR.iengl = iengl;
1415 PYQPAR.iangl = iangl;
1416}
1417
1418
1419void AliPythia::Pyevnw()
1420{
1421 // New multiple interaction scenario
1422 pyevnw();
1423}
1424
1425void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
1426{
1427 // Call medium-modified Pythia jet reconstruction algorithm
1428 //
1429 pyshowq(ip1, ip2, qmax);
1430}
1431 void AliPythia::Qpygin0()
1432 {
1433 // New multiple interaction scenario
1434 qpygin0();
1435 }
1436
1437void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1438{
1439 // Return event specific quenching parameters
1440 xp = fXJet;
1441 yp = fYJet;
1442 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1443
1444}
1445
1446void AliPythia::ConfigHeavyFlavor()
1447{
1448 //
1449 // Default configuration for Heavy Flavor production
1450 //
1451 // All QCD processes
1452 //
1453 SetMSEL(1);
1454
1455
1456 if (fItune < 0) {
1457 // No multiple interactions
1458 SetMSTP(81,0);
1459 SetPARP(81, 0.);
1460 SetPARP(82, 0.);
1461 }
1462 // Initial/final parton shower on (Pythia default)
1463 SetMSTP(61,1);
1464 SetMSTP(71,1);
1465
1466 // 2nd order alpha_s
1467 SetMSTP(2,2);
1468
1469 // QCD scales
1470 SetMSTP(32,2);
1471 SetPARP(34,1.0);
1472}
1473
1474void AliPythia::AtlasTuning()
1475{
1476 //
1477 // Configuration for the ATLAS tuning
1478 if (fItune > -1) return;
1479 printf("ATLAS TUNE \n");
1480
1481 SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
1482 SetMSTP(81,1); // Multiple Interactions ON
1483 SetMSTP(82,4); // Double Gaussian Model
1484 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
1485 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1486 SetPARP(89,1000.); // [GeV] Ref. energy
1487 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1488 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1489 SetPARP(84,0.5); // Core radius
1490 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1491 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1492 SetPARP(67,1); // Regulates Initial State Radiation
1493}
1494
1495void AliPythia::AtlasTuningMC09()
1496{
1497 //
1498 // Configuration for the ATLAS tuning
1499 if (fItune > -1) return;
1500 printf("ATLAS New TUNE MC09\n");
1501 SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
1502 SetMSTP(82, 4); // Double Gaussian Model
1503 SetMSTP(52, 2); // External PDF
1504 SetMSTP(51, 20650); // MRST LO*
1505
1506
1507 SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
1508 SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
1509 SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
1510 SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
1511
1512 SetPARP(78, 0.3); // the amount of color reconnection in the final state
1513 SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
1514 SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
1515 SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
1516 SetPARP(84, 0.7); // Core radius
1517 SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
1518 SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
1519
1520 SetMSTP(95, 6);
1521 SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
1522 SetPARJ(42, 0.58);
1523 SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
1524 SetPARP(89,1800.); // [GeV] Ref. energy
1525}
1526
1527AliPythia& AliPythia::operator=(const AliPythia& rhs)
1528{
1529// Assignment operator
1530 rhs.Copy(*this);
1531 return *this;
1532}
1533
1534 void AliPythia::Copy(TObject&) const
1535{
1536 //
1537 // Copy
1538 //
1539 Fatal("Copy","Not implemented!\n");
1540}
1541
1542void AliPythia::DalitzDecays()
1543{
1544
1545 //
1546 // Replace all omega dalitz decays with the correct matrix element decays
1547 //
1548 Int_t nt = fPyjets->N;
1549 for (Int_t i = 0; i < nt; i++) {
1550 if (fPyjets->K[1][i] != 223) continue;
1551 Int_t fd = fPyjets->K[3][i] - 1;
1552 Int_t ld = fPyjets->K[4][i] - 1;
1553 if (fd < 0) continue;
1554 if ((ld - fd) != 2) continue;
1555 if ((fPyjets->K[1][fd] != 111) ||
1556 ((TMath::Abs(fPyjets->K[1][fd+1]) != 11) && (TMath::Abs(fPyjets->K[1][fd+1]) != 13)))
1557 continue;
1558 TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1559 Int_t pdg = TMath::Abs(fPyjets->K[1][fd+1]);
1560 fOmegaDalitz.Decay(pdg, &omega);
1561 for (Int_t j = 0; j < 3; j++) {
1562 for (Int_t k = 0; k < 4; k++) {
1563 TLorentzVector vec = (fOmegaDalitz.Products())[2-j];
1564 fPyjets->P[k][fd+j] = vec[k];
1565 }
1566 }
1567 }
1568}
1569
1570
1571//
1572// Replace all dalitz(pi0,eta,omega,eta',phi) and resonance(rho,omega,phi,jpsi) decays with the correct matrix element decays
1573// for di-electron cocktail calculations
1574//
1575
1576
1577void AliPythia::PizeroDalitz()
1578{
1579
1580 Int_t nt = fPyjets->N;
1581 for (Int_t i = 0; i < nt; i++) {
1582 if (fPyjets->K[1][i] != 111) continue;
1583 Int_t fd = fPyjets->K[3][i] - 1;
1584 Int_t ld = fPyjets->K[4][i] - 1;
1585 if (fd < 0) continue;
1586 if ((ld - fd) != 2) continue;
1587 if ((fPyjets->K[1][fd] != 22) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11) )
1588 continue;
1589 TLorentzVector pizero(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1590 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1591 fExodus.Decay(pdg, &pizero);
1592 for (Int_t j = 0; j < 3; j++) {
1593 for (Int_t k = 0; k < 4; k++) {
1594 TLorentzVector vec = (fExodus.Products_pion())[2-j];
1595 fPyjets->P[k][fd+j] = vec[k];
1596 }
1597 }
1598 }
1599}
1600
1601
1602void AliPythia::EtaDalitz()
1603{
1604
1605 Int_t nt = fPyjets->N;
1606 for (Int_t i = 0; i < nt; i++) {
1607 if (fPyjets->K[1][i] != 221) continue;
1608 Int_t fd = fPyjets->K[3][i] - 1;
1609 Int_t ld = fPyjets->K[4][i] - 1;
1610 if (fd < 0) continue;
1611 if ((ld - fd) != 2) continue;
1612 if ((fPyjets->K[1][fd] != 22) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1613 continue;
1614 TLorentzVector eta(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1615 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1616 fExodus.Decay(pdg, &eta);
1617 for (Int_t j = 0; j < 3; j++) {
1618 for (Int_t k = 0; k < 4; k++) {
1619 TLorentzVector vec = (fExodus.Products_eta())[2-j];
1620 fPyjets->P[k][fd+j] = vec[k];
1621 }
1622 }
1623 }
1624}
1625
1626
1627void AliPythia::RhoDirect()
1628{
1629
1630 Int_t nt = fPyjets->N;
1631 for (Int_t i = 0; i < nt; i++) {
1632 if (fPyjets->K[1][i] != 113) continue;
1633 Int_t fd = fPyjets->K[3][i] - 1;
1634 Int_t ld = fPyjets->K[4][i] - 1;
1635 if (fd < 0) continue;
1636 if ((ld - fd) != 1) continue;
1637 if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1638 continue;
1639 TLorentzVector rho(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1640 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1641 fExodus.Decay(pdg, &rho);
1642 for (Int_t j = 0; j < 2; j++) {
1643 for (Int_t k = 0; k < 4; k++) {
1644 TLorentzVector vec = (fExodus.Products_rho())[1-j];
1645 fPyjets->P[k][fd+j] = vec[k];
1646 }
1647 }
1648 }
1649}
1650
1651
1652void AliPythia::OmegaDalitz()
1653{
1654
1655 Int_t nt = fPyjets->N;
1656 for (Int_t i = 0; i < nt; i++) {
1657 if (fPyjets->K[1][i] != 223) continue;
1658 Int_t fd = fPyjets->K[3][i] - 1;
1659 Int_t ld = fPyjets->K[4][i] - 1;
1660 if (fd < 0) continue;
1661 if ((ld - fd) != 2) continue;
1662 if ((fPyjets->K[1][fd] != 111) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1663 continue;
1664 TLorentzVector omegadalitz(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1665 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1666 fExodus.Decay(pdg, &omegadalitz);
1667 for (Int_t j = 0; j < 3; j++) {
1668 for (Int_t k = 0; k < 4; k++) {
1669 TLorentzVector vec = (fExodus.Products_omega_dalitz())[2-j];
1670 fPyjets->P[k][fd+j] = vec[k];
1671 }
1672 }
1673 }
1674}
1675
1676
1677void AliPythia::OmegaDirect()
1678{
1679
1680 Int_t nt = fPyjets->N;
1681 for (Int_t i = 0; i < nt; i++) {
1682 if (fPyjets->K[1][i] != 223) continue;
1683 Int_t fd = fPyjets->K[3][i] - 1;
1684 Int_t ld = fPyjets->K[4][i] - 1;
1685 if (fd < 0) continue;
1686 if ((ld - fd) != 1) continue;
1687 if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1688 continue;
1689 TLorentzVector omegadirect(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1690 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1691 fExodus.Decay(pdg, &omegadirect);
1692 for (Int_t j = 0; j < 2; j++) {
1693 for (Int_t k = 0; k < 4; k++) {
1694 TLorentzVector vec = (fExodus.Products_omega())[1-j];
1695 fPyjets->P[k][fd+j] = vec[k];
1696 }
1697 }
1698 }
1699}
1700
1701
1702void AliPythia::EtaprimeDalitz()
1703{
1704
1705 Int_t nt = fPyjets->N;
1706 for (Int_t i = 0; i < nt; i++) {
1707 if (fPyjets->K[1][i] != 331) continue;
1708 Int_t fd = fPyjets->K[3][i] - 1;
1709 Int_t ld = fPyjets->K[4][i] - 1;
1710 if (fd < 0) continue;
1711 if ((ld - fd) != 2) continue;
1712 if ((fPyjets->K[1][fd] != 22) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1713 continue;
1714 TLorentzVector etaprime(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1715 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1716 fExodus.Decay(pdg, &etaprime);
1717 for (Int_t j = 0; j < 3; j++) {
1718 for (Int_t k = 0; k < 4; k++) {
1719 TLorentzVector vec = (fExodus.Products_etaprime())[2-j];
1720 fPyjets->P[k][fd+j] = vec[k];
1721 }
1722 }
1723 }
1724}
1725
1726
1727void AliPythia::PhiDalitz()
1728{
1729
1730 Int_t nt = fPyjets->N;
1731 for (Int_t i = 0; i < nt; i++) {
1732 if (fPyjets->K[1][i] != 333) continue;
1733 Int_t fd = fPyjets->K[3][i] - 1;
1734 Int_t ld = fPyjets->K[4][i] - 1;
1735 if (fd < 0) continue;
1736 if ((ld - fd) != 2) continue;
1737 if ((fPyjets->K[1][fd] != 221) || (TMath::Abs(fPyjets->K[1][fd+1]) != 11))
1738 continue;
1739 TLorentzVector phidalitz(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1740 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1741 fExodus.Decay(pdg, &phidalitz);
1742 for (Int_t j = 0; j < 3; j++) {
1743 for (Int_t k = 0; k < 4; k++) {
1744 TLorentzVector vec = (fExodus.Products_phi_dalitz())[2-j];
1745 fPyjets->P[k][fd+j] = vec[k];
1746 }
1747 }
1748 }
1749}
1750
1751
1752void AliPythia::PhiDirect()
1753{
1754
1755 Int_t nt = fPyjets->N;
1756 for (Int_t i = 0; i < nt; i++) {
1757 if (fPyjets->K[1][i] != 333) continue;
1758 Int_t fd = fPyjets->K[3][i] - 1;
1759 Int_t ld = fPyjets->K[4][i] - 1;
1760 if (fd < 0) continue;
1761 if ((ld - fd) != 1) continue;
1762 if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1763 continue;
1764 TLorentzVector phi(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1765 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1766 fExodus.Decay(pdg, &phi);
1767 for (Int_t j = 0; j < 2; j++) {
1768 for (Int_t k = 0; k < 4; k++) {
1769 TLorentzVector vec = (fExodus.Products_phi())[1-j];
1770 fPyjets->P[k][fd+j] = vec[k];
1771 }
1772 }
1773 }
1774}
1775
1776void AliPythia::JPsiDirect()
1777{
1778
1779 Int_t nt = fPyjets->N;
1780 for (Int_t i = 0; i < nt; i++) {
1781 if (fPyjets->K[1][i] != 443) continue;
1782 Int_t fd = fPyjets->K[3][i] - 1;
1783 Int_t ld = fPyjets->K[4][i] - 1;
1784 if (fd < 0) continue;
1785 if ((ld - fd) != 1) continue;
1786 if ((TMath::Abs(fPyjets->K[1][fd]) != 11))
1787 continue;
1788 TLorentzVector jpsi(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
1789 Int_t pdg = TMath::Abs(fPyjets->K[1][i]);
1790 fExodus.Decay(pdg, &jpsi);
1791 for (Int_t j = 0; j < 2; j++) {
1792 for (Int_t k = 0; k < 4; k++) {
1793 TLorentzVector vec = (fExodus.Products_jpsi())[1-j];
1794 fPyjets->P[k][fd+j] = vec[k];
1795 }
1796 }
1797 }
1798}
1799
1800