Coverity errors corrected/avoided.
[u/mrichter/AliRoot.git] / PYTHIA6 / AliPythia.cxx
CommitLineData
8d2cd130 1/**************************************************************************
2 * Copyright(c) 1998-1999, ALICE Experiment at CERN, All rights reserved. *
3 * *
4 * Author: The ALICE Off-line Project. *
5 * Contributors are mentioned in the code where appropriate. *
6 * *
7 * Permission to use, copy, modify and distribute this software and its *
8 * documentation strictly for non-commercial purposes is hereby granted *
9 * without fee, provided that the above copyright notice appears in all *
10 * copies and that both the copyright notice and this permission notice *
11 * appear in the supporting documentation. The authors make no claims *
12 * about the suitability of this software for any purpose. It is *
13 * provided "as is" without express or implied warranty. *
14 **************************************************************************/
15
7cdba479 16/* $Id$ */
8d2cd130 17
18#include "AliPythia.h"
7cdba479 19#include "AliPythiaRndm.h"
12cb0bc0 20#include "AliFastGlauber.h"
21#include "AliQuenchingWeights.h"
03358a32 22#include "AliOmegaDalitz.h"
0f482ae4 23#include "TVector3.h"
03358a32 24#include "TLorentzVector.h"
12cb0bc0 25#include "PyquenCommon.h"
8d2cd130 26
27ClassImp(AliPythia)
28
29#ifndef WIN32
30# define pyclus pyclus_
31# define pycell pycell_
452af8c7 32# define pyshow pyshow_
33# define pyrobo pyrobo_
992f2843 34# define pyquen pyquen_
16a82508 35# define pyevnw pyevnw_
cd07c39b 36# define pyshowq pyshowq_
6c43eccb 37# define qpygin0 qpygin0_
694b39f9 38# define pytune pytune_
9b61ba2a 39# define py2ent py2ent_
8d2cd130 40# define type_of_call
41#else
42# define pyclus PYCLUS
43# define pycell PYCELL
452af8c7 44# define pyrobo PYROBO
992f2843 45# define pyquen PYQUEN
16a82508 46# define pyevnw PYEVNW
cd07c39b 47# define pyshowq PYSHOWQ
6c43eccb 48# define qpygin0 QPYGIN0
9b61ba2a 49# define pytune PYTUNE
50# define py2ent PY2ENT
8d2cd130 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 & );
452af8c7 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 &);
992f2843 58extern "C" void type_of_call pyquen(Double_t &, Int_t &, Double_t &);
0a2cfc0a 59extern "C" void type_of_call pyevnw(){;}
cd07c39b 60extern "C" void type_of_call pyshowq(Int_t &, Int_t &, Double_t &);
694b39f9 61extern "C" void type_of_call pytune(Int_t &);
9b61ba2a 62extern "C" void type_of_call py2ent(Int_t &, Int_t&, Int_t&, Double_t&);
6c43eccb 63extern "C" void type_of_call qpygin0();
8d2cd130 64//_____________________________________________________________________________
65
66AliPythia* AliPythia::fgAliPythia=NULL;
67
e8a8adcd 68AliPythia::AliPythia():
69 fProcess(kPyMb),
70 fEcms(0.),
71 fStrucFunc(kCTEQ5L),
72 fXJet(0.),
73 fYJet(0.),
32c8e463 74 fNGmax(30),
75 fZmax(0.97),
e8a8adcd 76 fGlauber(0),
0bd3d7c5 77 fQuenchingWeights(0),
03358a32 78 fItune(-1),
79 fOmegaDalitz()
8d2cd130 80{
81// Default Constructor
82//
83// Set random number
7cdba479 84 if (!AliPythiaRndm::GetPythiaRandom())
85 AliPythiaRndm::SetPythiaRandom(GetRandom());
0f482ae4 86 fGlauber = 0;
87 fQuenchingWeights = 0;
8d2cd130 88}
89
e8a8adcd 90AliPythia::AliPythia(const AliPythia& pythia):
6b435cde 91 TPythia6(pythia),
92 AliRndm(pythia),
e8a8adcd 93 fProcess(kPyMb),
94 fEcms(0.),
95 fStrucFunc(kCTEQ5L),
96 fXJet(0.),
97 fYJet(0.),
32c8e463 98 fNGmax(30),
99 fZmax(0.97),
e8a8adcd 100 fGlauber(0),
0bd3d7c5 101 fQuenchingWeights(0),
03358a32 102 fItune(-1),
103 fOmegaDalitz()
e8a8adcd 104{
105 // Copy Constructor
106 pythia.Copy(*this);
107}
108
efe3b1cd 109void AliPythia::ProcInit(Process_t process, Float_t energy, StrucFunc_t strucfunc, Int_t itune)
8d2cd130 110{
111// Initialise the process to generate
7cdba479 112 if (!AliPythiaRndm::GetPythiaRandom())
113 AliPythiaRndm::SetPythiaRandom(GetRandom());
8d2cd130 114
0bd3d7c5 115 fItune = itune;
116
8d2cd130 117 fProcess = process;
118 fEcms = energy;
119 fStrucFunc = strucfunc;
1d5b1b20 120//...Switch off decay of pi0, K0S, Lambda, Sigma+-, Xi0-, Omega-.
e2de0ce1 121 SetMDCY(Pycomp(111) ,1,0); // pi0
122 SetMDCY(Pycomp(310) ,1,0); // K0S
123 SetMDCY(Pycomp(3122),1,0); // kLambda
124 SetMDCY(Pycomp(3112),1,0); // sigma -
e2de0ce1 125 SetMDCY(Pycomp(3222),1,0); // sigma +
126 SetMDCY(Pycomp(3312),1,0); // xi -
127 SetMDCY(Pycomp(3322),1,0); // xi 0
128 SetMDCY(Pycomp(3334),1,0); // omega-
1c50ec12 129 // Select structure function
8d2cd130 130 SetMSTP(52,2);
e2de0ce1 131 SetMSTP(51, AliStructFuncType::PDFsetIndex(strucfunc));
1c50ec12 132 // Particles produced in string fragmentation point directly to either of the two endpoints
133 // of the string (depending in the side they were generated from).
134 SetMSTU(16,2);
135
8d2cd130 136//
137// Pythia initialisation for selected processes//
138//
139// Make MSEL clean
140//
141 for (Int_t i=1; i<= 200; i++) {
142 SetMSUB(i,0);
143 }
144// select charm production
145 switch (process)
146 {
65f2626c 147 case kPyOldUEQ2ordered: //Old underlying events with Q2 ordered QCD processes
148// Multiple interactions on.
149 SetMSTP(81,1);
150// Double Gaussian matter distribution.
151 SetMSTP(82,4);
152 SetPARP(83,0.5);
153 SetPARP(84,0.4);
154// pT0.
155 SetPARP(82,2.0);
156// Reference energy for pT0 and energy rescaling pace.
157 SetPARP(89,1800);
158 SetPARP(90,0.25);
159// String drawing almost completely minimizes string length.
160 SetPARP(85,0.9);
161 SetPARP(86,0.95);
162// ISR and FSR activity.
163 SetPARP(67,4);
164 SetPARP(71,4);
165// Lambda_FSR scale.
166 SetPARJ(81,0.29);
167 break;
168 case kPyOldUEQ2ordered2:
169// 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(90,0.16); // here is the difference with kPyOldUEQ2ordered
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 kPyOldPopcorn:
191// Old production mechanism: Old Popcorn
192 SetMSEL(1);
193 SetMSTJ(12,3);
194// (D=2) Like MSTJ(12)=2 but added prod ofthe 1er rank baryon
195 SetMSTP(88,2);
196// (D=1)see can be used to form baryons (BARYON JUNCTION)
197 SetMSTJ(1,1);
e0e89f40 198 AtlasTuning();
65f2626c 199 break;
8d2cd130 200 case kPyCharm:
201 SetMSEL(4);
8d2cd130 202// heavy quark masses
203
204 SetPMAS(4,1,1.2);
8d2cd130 205//
206// primordial pT
207 SetMSTP(91,1);
208 SetPARP(91,1.);
209 SetPARP(93,5.);
210//
211 break;
212 case kPyBeauty:
213 SetMSEL(5);
214 SetPMAS(5,1,4.75);
8d2cd130 215 break;
216 case kPyJpsi:
217 SetMSEL(0);
218// gg->J/Psi g
219 SetMSUB(86,1);
220 break;
221 case kPyJpsiChi:
222 SetMSEL(0);
223// gg->J/Psi g
224 SetMSUB(86,1);
225// gg-> chi_0c g
226 SetMSUB(87,1);
227// gg-> chi_1c g
228 SetMSUB(88,1);
229// gg-> chi_2c g
230 SetMSUB(89,1);
231 break;
232 case kPyCharmUnforced:
233 SetMSEL(0);
234// gq->qg
235 SetMSUB(28,1);
236// gg->qq
237 SetMSUB(53,1);
238// gg->gg
239 SetMSUB(68,1);
240 break;
241 case kPyBeautyUnforced:
242 SetMSEL(0);
243// gq->qg
244 SetMSUB(28,1);
245// gg->qq
246 SetMSUB(53,1);
247// gg->gg
248 SetMSUB(68,1);
249 break;
250 case kPyMb:
251// Minimum Bias pp-Collisions
252//
253//
254// select Pythia min. bias model
255 SetMSEL(0);
511db649 256 SetMSUB(92,1); // single diffraction AB-->XB
257 SetMSUB(93,1); // single diffraction AB-->AX
258 SetMSUB(94,1); // double diffraction
259 SetMSUB(95,1); // low pt production
260
e0e89f40 261 AtlasTuning();
511db649 262 break;
0bd3d7c5 263
264 case kPyMbAtlasTuneMC09:
265// Minimum Bias pp-Collisions
266//
267//
268// select Pythia min. bias model
269 SetMSEL(0);
270 SetMSUB(92,1); // single diffraction AB-->XB
271 SetMSUB(93,1); // single diffraction AB-->AX
272 SetMSUB(94,1); // double diffraction
273 SetMSUB(95,1); // low pt production
274
275 AtlasTuning_MC09();
276 break;
04081a91 277
278 case kPyMbWithDirectPhoton:
279// Minimum Bias pp-Collisions with direct photon processes added
280//
281//
282// select Pythia min. bias model
283 SetMSEL(0);
284 SetMSUB(92,1); // single diffraction AB-->XB
285 SetMSUB(93,1); // single diffraction AB-->AX
286 SetMSUB(94,1); // double diffraction
287 SetMSUB(95,1); // low pt production
288
289 SetMSUB(14,1); //
290 SetMSUB(18,1); //
291 SetMSUB(29,1); //
292 SetMSUB(114,1); //
293 SetMSUB(115,1); //
294
295
296 AtlasTuning();
297 break;
298
f529e69b 299 case kPyMbDefault:
300// Minimum Bias pp-Collisions
301//
302//
303// select Pythia min. bias model
304 SetMSEL(0);
6d2ec66d 305 SetMSUB(92,1); // single diffraction AB-->XB
306 SetMSUB(93,1); // single diffraction AB-->AX
f529e69b 307 SetMSUB(94,1); // double diffraction
308 SetMSUB(95,1); // low pt production
f529e69b 309 break;
0a0cbcfd 310 case kPyLhwgMb:
311// Les Houches Working Group 05 Minimum Bias pp-Collisions: hep-ph/0604120
312// -> Pythia 6.3 or above is needed
313//
314 SetMSEL(0);
315 SetMSUB(92,1); // single diffraction AB-->XB
316 SetMSUB(93,1); // single diffraction AB-->AX
317 SetMSUB(94,1); // double diffraction
318 SetMSUB(95,1); // low pt production
319
e2de0ce1 320 SetMSTP(51,AliStructFuncType::PDFsetIndex(kCTEQ6ll)); // CTEQ6ll pdf
0a0cbcfd 321 SetMSTP(52,2);
322 SetMSTP(68,1);
323 SetMSTP(70,2);
324 SetMSTP(81,1); // Multiple Interactions ON
325 SetMSTP(82,4); // Double Gaussian Model
326 SetMSTP(88,1);
327
328 SetPARP(82,2.3); // [GeV] PT_min at Ref. energy
329 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
330 SetPARP(84,0.5); // Core radius
331 SetPARP(85,0.9); // Regulates gluon prod. mechanism
332 SetPARP(90,0.2); // 2*epsilon (exponent in power law)
333
334 break;
8d2cd130 335 case kPyMbNonDiffr:
336// Minimum Bias pp-Collisions
337//
338//
339// select Pythia min. bias model
340 SetMSEL(0);
511db649 341 SetMSUB(95,1); // low pt production
0f482ae4 342
e0e89f40 343 AtlasTuning();
8d2cd130 344 break;
d7de4a67 345 case kPyMbMSEL1:
346 ConfigHeavyFlavor();
347// Intrinsic <kT^2>
348 SetMSTP(91,1);// Width (1=gaussian) primordial kT dist. inside hadrons
349 SetPARP(91,1.); // <kT^2> = PARP(91,1.)^2
350 SetPARP(93,5.); // Upper cut-off
351// Set Q-quark mass
352 SetPMAS(4,1,1.2); // Charm quark mass
353 SetPMAS(5,1,4.78); // Beauty quark mass
354 SetPARP(71,4.); // Defaut value
355// Atlas Tuning
356 AtlasTuning();
357 break;
8d2cd130 358 case kPyJets:
359//
360// QCD Jets
361//
362 SetMSEL(1);
65f2626c 363 // Pythia Tune A (CDF)
364 //
4167b79f 365 SetPARP(67,2.5); // Regulates Initial State Radiation (value from best fit to D0 dijet analysis)
65f2626c 366 SetMSTP(82,4); // Double Gaussian Model
367 SetPARP(82,2.0); // [GeV] PT_min at Ref. energy
368 SetPARP(84,0.4); // Core radius
369 SetPARP(85,0.90) ; // Regulates gluon prod. mechanism
370 SetPARP(86,0.95); // Regulates gluon prod. mechanism
371 SetPARP(89,1800.); // [GeV] Ref. energy
0bd3d7c5 372 SetPARP(90,0.25); // 2*epsilon (exponent in power law)
65f2626c 373 break;
8d2cd130 374 case kPyDirectGamma:
375 SetMSEL(10);
376 break;
adf4d898 377 case kPyCharmPbPbMNR:
378 case kPyD0PbPbMNR:
90d7b703 379 case kPyDPlusPbPbMNR:
e0e89f40 380 case kPyDPlusStrangePbPbMNR:
90d7b703 381 // Tuning of Pythia parameters aimed to get a resonable agreement
382 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
383 // c-cbar single inclusive and double differential distributions.
384 // This parameter settings are meant to work with Pb-Pb collisions
385 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
386 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
387 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 388 ConfigHeavyFlavor();
90d7b703 389 // Intrinsic <kT>
390 SetMSTP(91,1);
391 SetPARP(91,1.304);
392 SetPARP(93,6.52);
90d7b703 393 // Set c-quark mass
394 SetPMAS(4,1,1.2);
90d7b703 395 break;
adf4d898 396 case kPyCharmpPbMNR:
397 case kPyD0pPbMNR:
90d7b703 398 case kPyDPluspPbMNR:
e0e89f40 399 case kPyDPlusStrangepPbMNR:
90d7b703 400 // Tuning of Pythia parameters aimed to get a resonable agreement
401 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
402 // c-cbar single inclusive and double differential distributions.
403 // This parameter settings are meant to work with p-Pb collisions
404 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
405 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
406 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 407 ConfigHeavyFlavor();
90d7b703 408 // Intrinsic <kT>
3dc3ec94 409 SetMSTP(91,1);
410 SetPARP(91,1.16);
411 SetPARP(93,5.8);
412
90d7b703 413 // Set c-quark mass
3dc3ec94 414 SetPMAS(4,1,1.2);
90d7b703 415 break;
adf4d898 416 case kPyCharmppMNR:
417 case kPyD0ppMNR:
90d7b703 418 case kPyDPlusppMNR:
e0e89f40 419 case kPyDPlusStrangeppMNR:
68504d42 420 case kPyLambdacppMNR:
90d7b703 421 // Tuning of Pythia parameters aimed to get a resonable agreement
422 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
423 // c-cbar single inclusive and double differential distributions.
424 // This parameter settings are meant to work with pp collisions
425 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
426 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
427 // has to be set to 2.1GeV. Example in ConfigCharmPPR.C.
3dc3ec94 428 ConfigHeavyFlavor();
90d7b703 429 // Intrinsic <kT^2>
3dc3ec94 430 SetMSTP(91,1);
431 SetPARP(91,1.);
432 SetPARP(93,5.);
433
90d7b703 434 // Set c-quark mass
3dc3ec94 435 SetPMAS(4,1,1.2);
90d7b703 436 break;
e0e89f40 437 case kPyCharmppMNRwmi:
438 // Tuning of Pythia parameters aimed to get a resonable agreement
439 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
440 // c-cbar single inclusive and double differential distributions.
441 // This parameter settings are meant to work with pp collisions
442 // and with kCTEQ5L PDFs.
443 // Added multiple interactions according to ATLAS tune settings.
444 // To get a "reasonable" agreement with MNR results, events have to be
445 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
446 // set to 2.76 GeV.
447 // To get a "perfect" agreement with MNR results, events have to be
448 // generated in four ptHard bins with the following relative
449 // normalizations:
450 // 2.76-3 GeV: 25%
451 // 3-4 GeV: 40%
452 // 4-8 GeV: 29%
453 // >8 GeV: 6%
454 ConfigHeavyFlavor();
455 // Intrinsic <kT^2>
456 SetMSTP(91,1);
457 SetPARP(91,1.);
458 SetPARP(93,5.);
459
460 // Set c-quark mass
461 SetPMAS(4,1,1.2);
462 AtlasTuning();
463 break;
adf4d898 464 case kPyBeautyPbPbMNR:
8d2cd130 465 // Tuning of Pythia parameters aimed to get a resonable agreement
466 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
467 // b-bbar single inclusive and double differential distributions.
468 // This parameter settings are meant to work with Pb-Pb collisions
469 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
470 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
471 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 472 ConfigHeavyFlavor();
8d2cd130 473 // QCD scales
3dc3ec94 474 SetPARP(67,1.0);
475 SetPARP(71,1.0);
adf4d898 476 // Intrinsic <kT>
3dc3ec94 477 SetMSTP(91,1);
478 SetPARP(91,2.035);
479 SetPARP(93,10.17);
8d2cd130 480 // Set b-quark mass
3dc3ec94 481 SetPMAS(5,1,4.75);
8d2cd130 482 break;
adf4d898 483 case kPyBeautypPbMNR:
484 // Tuning of Pythia parameters aimed to get a resonable agreement
485 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
486 // b-bbar single inclusive and double differential distributions.
487 // This parameter settings are meant to work with p-Pb collisions
488 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
489 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
490 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 491 ConfigHeavyFlavor();
adf4d898 492 // QCD scales
3dc3ec94 493 SetPARP(67,1.0);
494 SetPARP(71,1.0);
adf4d898 495 // Intrinsic <kT>
3dc3ec94 496 SetMSTP(91,1);
497 SetPARP(91,1.60);
498 SetPARP(93,8.00);
adf4d898 499 // Set b-quark mass
3dc3ec94 500 SetPMAS(5,1,4.75);
adf4d898 501 break;
502 case kPyBeautyppMNR:
503 // Tuning of Pythia parameters aimed to get a resonable agreement
504 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
505 // b-bbar single inclusive and double differential distributions.
506 // This parameter settings are meant to work with pp collisions
507 // (AliGenPythia::SetNuclei) and with kCTEQ4L PDFs.
508 // To get a good agreement the minimum ptHard (AliGenPythia::SetPtHard)
509 // has to be set to 2.75GeV. Example in ConfigBeautyPPR.C.
3dc3ec94 510 ConfigHeavyFlavor();
adf4d898 511 // QCD scales
3dc3ec94 512 SetPARP(67,1.0);
513 SetPARP(71,1.0);
514
515 // Intrinsic <kT>
516 SetMSTP(91,1);
517 SetPARP(91,1.);
518 SetPARP(93,5.);
519
520 // Set b-quark mass
521 SetPMAS(5,1,4.75);
adf4d898 522 break;
9dfe63b3 523 case kPyBeautyJets:
e0e89f40 524 case kPyBeautyppMNRwmi:
525 // Tuning of Pythia parameters aimed to get a resonable agreement
526 // between with the NLO calculation by Mangano, Nason, Ridolfi for the
527 // b-bbar single inclusive and double differential distributions.
528 // This parameter settings are meant to work with pp collisions
529 // and with kCTEQ5L PDFs.
530 // Added multiple interactions according to ATLAS tune settings.
531 // To get a "reasonable" agreement with MNR results, events have to be
532 // generated with the minimum ptHard (AliGenPythia::SetPtHard)
533 // set to 2.76 GeV.
534 // To get a "perfect" agreement with MNR results, events have to be
535 // generated in four ptHard bins with the following relative
536 // normalizations:
537 // 2.76-4 GeV: 5%
538 // 4-6 GeV: 31%
539 // 6-8 GeV: 28%
540 // >8 GeV: 36%
541 ConfigHeavyFlavor();
542 // QCD scales
543 SetPARP(67,1.0);
544 SetPARP(71,1.0);
545
546 // Intrinsic <kT>
547 SetMSTP(91,1);
548 SetPARP(91,1.);
549 SetPARP(93,5.);
550
551 // Set b-quark mass
552 SetPMAS(5,1,4.75);
553
554 AtlasTuning();
555 break;
589380c6 556 case kPyW:
557
558 //Inclusive production of W+/-
559 SetMSEL(0);
560 //f fbar -> W+
561 SetMSUB(2,1);
562 // //f fbar -> g W+
563 // SetMSUB(16,1);
564 // //f fbar -> gamma W+
565 // SetMSUB(20,1);
566 // //f g -> f W+
567 // SetMSUB(31,1);
568 // //f gamma -> f W+
569 // SetMSUB(36,1);
570
571 // Initial/final parton shower on (Pythia default)
572 // With parton showers on we are generating "W inclusive process"
573 SetMSTP(61,1); //Initial QCD & QED showers on
574 SetMSTP(71,1); //Final QCD & QED showers on
575
576 break;
0f6ee828 577
578 case kPyZ:
579
580 //Inclusive production of Z
581 SetMSEL(0);
582 //f fbar -> Z/gamma
583 SetMSUB(1,1);
584
585 // // f fbar -> g Z/gamma
586 // SetMSUB(15,1);
587 // // f fbar -> gamma Z/gamma
588 // SetMSUB(19,1);
589 // // f g -> f Z/gamma
590 // SetMSUB(30,1);
591 // // f gamma -> f Z/gamma
592 // SetMSUB(35,1);
593
594 //only Z included, not gamma
595 SetMSTP(43,2);
596
597 // Initial/final parton shower on (Pythia default)
598 // With parton showers on we are generating "Z inclusive process"
599 SetMSTP(61,1); //Initial QCD & QED showers on
600 SetMSTP(71,1); //Final QCD & QED showers on
601
602 break;
603
8d2cd130 604 }
605//
606// Initialize PYTHIA
efe3b1cd 607//
608// Select the tune
609 if (itune > -1) Pytune(itune);
610
611//
8d2cd130 612 SetMSTP(41,1); // all resonance decays switched on
d95b55fa 613 Initialize("CMS","p","p",fEcms);
03358a32 614 fOmegaDalitz.Init();
8d2cd130 615}
616
617Int_t AliPythia::CheckedLuComp(Int_t kf)
618{
619// Check Lund particle code (for debugging)
620 Int_t kc=Pycomp(kf);
621 printf("\n Lucomp kf,kc %d %d",kf,kc);
622 return kc;
623}
624
20e47f08 625void AliPythia::SetNuclei(Int_t a1, Int_t a2, Int_t pdf)
8d2cd130 626{
627// Treat protons as inside nuclei with mass numbers a1 and a2
628// The MSTP array in the PYPARS common block is used to enable and
629// select the nuclear structure functions.
630// MSTP(52) : (D=1) choice of proton and nuclear structure-function library
631// =1: internal PYTHIA acording to MSTP(51)
632// =2: PDFLIB proton s.f., with MSTP(51) = 1000xNGROUP+NSET
633// If the following mass number both not equal zero, nuclear corrections of the stf are used.
634// MSTP(192) : Mass number of nucleus side 1
635// MSTP(193) : Mass number of nucleus side 2
20e47f08 636// MSTP(194) : Nuclear structure function: 0: EKS98 1:EPS08
8d2cd130 637 SetMSTP(52,2);
638 SetMSTP(192, a1);
20e47f08 639 SetMSTP(193, a2);
640 SetMSTP(194, pdf);
8d2cd130 641}
642
643
644AliPythia* AliPythia::Instance()
645{
646// Set random number generator
647 if (fgAliPythia) {
648 return fgAliPythia;
649 } else {
650 fgAliPythia = new AliPythia();
651 return fgAliPythia;
652 }
653}
654
655void AliPythia::PrintParticles()
656{
657// Print list of particl properties
658 Int_t np = 0;
c31f1d37 659 char* name = new char[16];
8d2cd130 660 for (Int_t kf=0; kf<1000000; kf++) {
661 for (Int_t c = 1; c > -2; c-=2) {
8d2cd130 662 Int_t kc = Pycomp(c*kf);
663 if (kc) {
664 Float_t mass = GetPMAS(kc,1);
665 Float_t width = GetPMAS(kc,2);
666 Float_t tau = GetPMAS(kc,4);
c31f1d37 667
8d2cd130 668 Pyname(kf,name);
669
670 np++;
671
672 printf("\n mass, width, tau: %6d %s %10.3f %10.3e %10.3e",
673 c*kf, name, mass, width, tau);
674 }
675 }
676 }
677 printf("\n Number of particles %d \n \n", np);
678}
679
680void AliPythia::ResetDecayTable()
681{
682// Set default values for pythia decay switches
683 Int_t i;
684 for (i = 1; i < 501; i++) SetMDCY(i,1,fDefMDCY[i]);
685 for (i = 1; i < 2001; i++) SetMDME(i,1,fDefMDME[i]);
686}
687
688void AliPythia::SetDecayTable()
689{
690// Set default values for pythia decay switches
691//
692 Int_t i;
693 for (i = 1; i < 501; i++) fDefMDCY[i] = GetMDCY(i,1);
694 for (i = 1; i < 2001; i++) fDefMDME[i] = GetMDME(i,1);
695}
696
697void AliPythia::Pyclus(Int_t& njet)
698{
699// Call Pythia clustering algorithm
700//
701 pyclus(njet);
702}
703
704void AliPythia::Pycell(Int_t& njet)
705{
706// Call Pythia jet reconstruction algorithm
707//
708 pycell(njet);
709}
710
452af8c7 711void AliPythia::Pyshow(Int_t ip1, Int_t ip2, Double_t qmax)
712{
713// Call Pythia jet reconstruction algorithm
714//
452af8c7 715 pyshow(ip1, ip2, qmax);
716}
717
718void AliPythia::Pyrobo(Int_t imi, Int_t ima, Double_t the, Double_t phi, Double_t bex, Double_t bey, Double_t bez)
719{
720 pyrobo(imi, ima, the, phi, bex, bey, bez);
721}
722
694b39f9 723void AliPythia::Pytune(Int_t itune)
724{
c5e2801a 725/*
726C
727C ITUNE NAME (detailed descriptions below)
728C 0 Default : No settings changed => linked Pythia version's defaults.
729C ====== Old UE, Q2-ordered showers ==========================================
730C 100 A : Rick Field's CDF Tune A
731C 101 AW : Rick Field's CDF Tune AW
732C 102 BW : Rick Field's CDF Tune BW
733C 103 DW : Rick Field's CDF Tune DW
734C 104 DWT : Rick Field's CDF Tune DW with slower UE energy scaling
735C 105 QW : Rick Field's CDF Tune QW (NB: needs CTEQ6.1M pdfs externally)
736C 106 ATLAS-DC2: Arthur Moraes' (old) ATLAS tune (ATLAS DC2 / Rome)
737C 107 ACR : Tune A modified with annealing CR
738C 108 D6 : Rick Field's CDF Tune D6 (NB: needs CTEQ6L pdfs externally)
739C 109 D6T : Rick Field's CDF Tune D6T (NB: needs CTEQ6L pdfs externally)
740C ====== Intermediate Models =================================================
741C 200 IM 1 : Intermediate model: new UE, Q2-ordered showers, annealing CR
742C 201 APT : Tune A modified to use pT-ordered final-state showers
743C ====== New UE, interleaved pT-ordered showers, annealing CR ================
744C 300 S0 : Sandhoff-Skands Tune 0
745C 301 S1 : Sandhoff-Skands Tune 1
746C 302 S2 : Sandhoff-Skands Tune 2
747C 303 S0A : S0 with "Tune A" UE energy scaling
748C 304 NOCR : New UE "best try" without colour reconnections
749C 305 Old : New UE, original (primitive) colour reconnections
750C 306 ATLAS-CSC: Arthur Moraes' (new) ATLAS tune (needs CTEQ6L externally)
751C ======= The Uppsala models =================================================
752C ( NB! must be run with special modified Pythia 6.215 version )
753C ( available from http://www.isv.uu.se/thep/MC/scigal/ )
754C 400 GAL 0 : Generalized area-law model. Old parameters
755C 401 SCI 0 : Soft-Colour-Interaction model. Old parameters
756C 402 GAL 1 : Generalized area-law model. Tevatron MB retuned (Skands)
757*/
694b39f9 758 pytune(itune);
759}
760
9b61ba2a 761void AliPythia::Py2ent(Int_t idx, Int_t pdg1, Int_t pdg2, Double_t p){
762 // Inset 2-parton system at line idx
763 py2ent(idx, pdg1, pdg2, p);
764}
452af8c7 765
766
32c8e463 767void AliPythia::InitQuenching(Float_t cMin, Float_t cMax, Float_t k, Int_t iECMethod, Float_t zmax, Int_t ngmax)
0f482ae4 768{
769// Initializes
770// (1) The quenching model using quenching weights according to C. Salgado and U. Wiedemann
771// (2) The nuclear geometry using the Glauber Model
772//
6b435cde 773
18b7a4a1 774 fGlauber = AliFastGlauber::Instance();
0f482ae4 775 fGlauber->Init(2);
776 fGlauber->SetCentralityClass(cMin, cMax);
777
778 fQuenchingWeights = new AliQuenchingWeights();
779 fQuenchingWeights->InitMult();
86b6ad68 780 fQuenchingWeights->SetK(k);
0f482ae4 781 fQuenchingWeights->SetECMethod(AliQuenchingWeights::kECMethod(iECMethod));
32c8e463 782 fNGmax = ngmax;
783 fZmax = zmax;
784
0f482ae4 785}
786
787
452af8c7 788void AliPythia::Quench()
789{
790//
791//
792// Simple Jet Quenching routine:
793// =============================
794// The jet formed by all final state partons radiated by the parton created
0f482ae4 795// in the hard collisions is quenched by a factor (1-z) using light cone variables in
796// the initial parton reference frame:
452af8c7 797// (E + p_z)new = (1-z) (E + p_z)old
798//
0f482ae4 799//
800//
801//
452af8c7 802// The lost momentum is first balanced by one gluon with virtuality > 0.
803// Subsequently the gluon splits to yield two gluons with E = p.
804//
0f482ae4 805//
806//
4e383037 807 static Float_t eMean = 0.;
808 static Int_t icall = 0;
0f482ae4 809
c2c598a3 810 Double_t p0[4][5];
811 Double_t p1[4][5];
812 Double_t p2[4][5];
813 Int_t klast[4] = {-1, -1, -1, -1};
452af8c7 814
815 Int_t numpart = fPyjets->N;
86b6ad68 816 Double_t px = 0., py = 0., pz = 0., e = 0., m = 0., p = 0., pt = 0., theta = 0., phi = 0.;
c2c598a3 817 Double_t pxq[4], pyq[4], pzq[4], eq[4], yq[4], mq[4], pq[4], phiq[4], thetaq[4], ptq[4];
818 Bool_t quenched[4];
b280c4cc 819 Double_t wjtKick[4];
c2c598a3 820 Int_t nGluon[4];
86b6ad68 821 Int_t qPdg[4];
0f482ae4 822 Int_t imo, kst, pdg;
b280c4cc 823
511db649 824//
c2c598a3 825// Sore information about Primary partons
826//
827// j =
828// 0, 1 partons from hard scattering
829// 2, 3 partons from initial state radiation
830//
831 for (Int_t i = 2; i <= 7; i++) {
832 Int_t j = 0;
833 // Skip gluons that participate in hard scattering
834 if (i == 4 || i == 5) continue;
835 // Gluons from hard Scattering
836 if (i == 6 || i == 7) {
837 j = i - 6;
838 pxq[j] = fPyjets->P[0][i];
839 pyq[j] = fPyjets->P[1][i];
840 pzq[j] = fPyjets->P[2][i];
841 eq[j] = fPyjets->P[3][i];
842 mq[j] = fPyjets->P[4][i];
843 } else {
844 // Gluons from initial state radiation
845 //
846 // Obtain 4-momentum vector from difference between original parton and parton after gluon
847 // radiation. Energy is calculated independently because initial state radition does not
848 // conserve strictly momentum and energy for each partonic system independently.
849 //
850 // Not very clean. Should be improved !
851 //
852 //
853 j = i;
854 pxq[j] = fPyjets->P[0][i] - fPyjets->P[0][i+2];
855 pyq[j] = fPyjets->P[1][i] - fPyjets->P[1][i+2];
856 pzq[j] = fPyjets->P[2][i] - fPyjets->P[2][i+2];
857 mq[j] = fPyjets->P[4][i];
858 eq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j] + mq[j] * mq[j]);
859 }
860//
861// Calculate some kinematic variables
511db649 862//
4e383037 863 yq[j] = 0.5 * TMath::Log((eq[j] + pzq[j] + 1.e-14) / (eq[j] - pzq[j] + 1.e-14));
0f482ae4 864 pq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j] + pzq[j] * pzq[j]);
865 phiq[j] = TMath::Pi()+TMath::ATan2(-pyq[j], -pxq[j]);
866 ptq[j] = TMath::Sqrt(pxq[j] * pxq[j] + pyq[j] * pyq[j]);
867 thetaq[j] = TMath::ATan2(ptq[j], pzq[j]);
86b6ad68 868 qPdg[j] = fPyjets->K[1][i];
869 }
870
871 Double_t int0[4];
872 Double_t int1[4];
86b6ad68 873
b280c4cc 874 fGlauber->GetI0I1ForPythiaAndXY(4, phiq, int0, int1, fXJet, fYJet, 15.);
875
86b6ad68 876 for (Int_t j = 0; j < 4; j++) {
c2c598a3 877 //
878 // Quench only central jets and with E > 10.
879 //
86b6ad68 880
881
882 Int_t itype = (qPdg[j] == 21) ? 2 : 1;
883 Double_t eloss = fQuenchingWeights->GetELossRandomKFast(itype, int0[j], int1[j], eq[j]);
884
c2c598a3 885 if (TMath::Abs(yq[j]) > 2.5 || eq[j] < 10.) {
b280c4cc 886 fZQuench[j] = 0.;
0f482ae4 887 } else {
c2c598a3 888 if (eq[j] > 40. && TMath::Abs(yq[j]) < 0.5) {
4e383037 889 icall ++;
890 eMean += eloss;
891 }
0f482ae4 892 //
893 // Extra pt
86b6ad68 894 Double_t l = fQuenchingWeights->CalcLk(int0[j], int1[j]);
895 wjtKick[j] = TMath::Sqrt(l * fQuenchingWeights->CalcQk(int0[j], int1[j]));
0f482ae4 896 //
897 // Fractional energy loss
b280c4cc 898 fZQuench[j] = eloss / eq[j];
0f482ae4 899 //
900 // Avoid complete loss
901 //
1044c4d8 902 if (fZQuench[j] > fZmax) fZQuench[j] = fZmax;
0f482ae4 903 //
904 // Some debug printing
86b6ad68 905
906
bf9bb016 907// 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",
908// j, itype, eq[j], phiq[j], l, eloss, wjtKick[j], eMean / Float_t(icall+1), yq[j]);
4e383037 909
b280c4cc 910// fZQuench[j] = 0.8;
911// while (fZQuench[j] >= 0.95) fZQuench[j] = gRandom->Exp(0.2);
0f482ae4 912 }
4e383037 913
b280c4cc 914 quenched[j] = (fZQuench[j] > 0.01);
4e383037 915 } // primary partons
c2c598a3 916
b280c4cc 917
918
6e90ad26 919 Double_t pNew[1000][4];
920 Int_t kNew[1000];
921 Int_t icount = 0;
b280c4cc 922 Double_t zquench[4];
923
6e90ad26 924//
4e383037 925// System Loop
c2c598a3 926 for (Int_t isys = 0; isys < 4; isys++) {
6e90ad26 927// Skip to next system if not quenched.
4e383037 928 if (!quenched[isys]) continue;
929
b280c4cc 930 nGluon[isys] = 1 + Int_t(fZQuench[isys] / (1. - fZQuench[isys]));
32c8e463 931 if (nGluon[isys] > fNGmax) nGluon[isys] = fNGmax;
b280c4cc 932 zquench[isys] = 1. - TMath::Power(1. - fZQuench[isys], 1./Double_t(nGluon[isys]));
4e383037 933 wjtKick[isys] = wjtKick[isys] / TMath::Sqrt(Double_t(nGluon[isys]));
0f482ae4 934
4e383037 935
936
937 Int_t igMin = -1;
938 Int_t igMax = -1;
939 Double_t pg[4] = {0., 0., 0., 0.};
940
941//
942// Loop on radiation events
943
944 for (Int_t iglu = 0; iglu < nGluon[isys]; iglu++) {
6e90ad26 945 while (1) {
946 icount = 0;
947 for (Int_t k = 0; k < 4; k++)
948 {
949 p0[isys][k] = 0.;
950 p1[isys][k] = 0.;
951 p2[isys][k] = 0.;
952 }
953// Loop over partons
954 for (Int_t i = 0; i < numpart; i++)
955 {
956 imo = fPyjets->K[2][i];
957 kst = fPyjets->K[0][i];
958 pdg = fPyjets->K[1][i];
959
960
961
0f482ae4 962// Quarks and gluons only
6e90ad26 963 if (pdg != 21 && TMath::Abs(pdg) > 6) continue;
0f482ae4 964// Particles from hard scattering only
c2c598a3 965
6e90ad26 966 if (imo > 8 && imo < 1000) imo = fPyjets->K[2][imo - 1];
c2c598a3 967 Int_t imom = imo % 1000;
968 if ((isys == 0 || isys == 1) && ((imom != (isys + 7)))) continue;
969 if ((isys == 2 || isys == 3) && ((imom != (isys + 1)))) continue;
970
6e90ad26 971
0f482ae4 972// Skip comment lines
6e90ad26 973 if (kst != 1 && kst != 2) continue;
0f482ae4 974//
975// Parton kinematic
6e90ad26 976 px = fPyjets->P[0][i];
977 py = fPyjets->P[1][i];
978 pz = fPyjets->P[2][i];
979 e = fPyjets->P[3][i];
980 m = fPyjets->P[4][i];
981 pt = TMath::Sqrt(px * px + py * py);
982 p = TMath::Sqrt(px * px + py * py + pz * pz);
983 phi = TMath::Pi() + TMath::ATan2(-py, -px);
984 theta = TMath::ATan2(pt, pz);
985
0f482ae4 986//
c2c598a3 987// Save 4-momentum sum for balancing
988 Int_t index = isys;
6e90ad26 989
990 p0[index][0] += px;
991 p0[index][1] += py;
992 p0[index][2] += pz;
993 p0[index][3] += e;
6e90ad26 994
995 klast[index] = i;
996
0f482ae4 997//
998// Fractional energy loss
b280c4cc 999 Double_t z = zquench[index];
4e383037 1000
c2c598a3 1001
4e383037 1002// Don't fully quench radiated gluons
1003//
1004 if (imo > 1000) {
1005// This small factor makes sure that the gluons are not too close in phase space to avoid recombination
1006//
1007
c2c598a3 1008 z = 0.02;
4e383037 1009 }
c2c598a3 1010// printf("z: %d %f\n", imo, z);
1011
4e383037 1012
1013//
6e90ad26 1014
1015 //
1016 //
1017 // Transform into frame in which initial parton is along z-axis
1018 //
1019 TVector3 v(px, py, pz);
1020 v.RotateZ(-phiq[index]); v.RotateY(-thetaq[index]);
1021 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pl = v.Z();
1022
1023 Double_t jt = TMath::Sqrt(pxs * pxs + pys * pys);
1024 Double_t mt2 = jt * jt + m * m;
1025 Double_t zmax = 1.;
1026 //
1027 // Kinematic limit on z
1028 //
4e383037 1029 if (m > 0.) zmax = 1. - m / TMath::Sqrt(m * m + jt * jt);
6e90ad26 1030 //
1031 // Change light-cone kinematics rel. to initial parton
1032 //
1033 Double_t eppzOld = e + pl;
1034 Double_t empzOld = e - pl;
1035
1036 Double_t eppzNew = (1. - z) * eppzOld;
1037 Double_t empzNew = empzOld - mt2 * z / eppzOld;
1038 Double_t eNew = 0.5 * (eppzNew + empzNew);
1039 Double_t plNew = 0.5 * (eppzNew - empzNew);
1040
1041 Double_t jtNew;
1042 //
1043 // if mt very small (or sometimes even < 0 for numerical reasons) set it to 0
1044 Double_t mt2New = eppzNew * empzNew;
1045 if (mt2New < 1.e-8) mt2New = 0.;
4e383037 1046 if (z < zmax) {
1047 if (m * m > mt2New) {
1048 //
1049 // This should not happen
1050 //
1051 Fatal("Quench()", "This should never happen %e %e %e!", m, eppzNew, empzNew);
1052 jtNew = 0;
1053 } else {
1054 jtNew = TMath::Sqrt(mt2New - m * m);
1055 }
6e90ad26 1056 } else {
4e383037 1057 // If pT is to small (probably a leading massive particle) we scale only the energy
1058 // This can cause negative masses of the radiated gluon
1059 // Let's hope for the best ...
1060 jtNew = jt;
1061 eNew = TMath::Sqrt(plNew * plNew + mt2);
1062
6e90ad26 1063 }
6e90ad26 1064 //
1065 // Calculate new px, py
1066 //
b07be423 1067 Double_t pxNew = 0;
1068 Double_t pyNew = 0;
6e90ad26 1069
b07be423 1070 if (jt>0) {
6b118b3c 1071 pxNew = jtNew / jt * pxs;
1072 pyNew = jtNew / jt * pys;
b07be423 1073 }
6e90ad26 1074// Double_t dpx = pxs - pxNew;
1075// Double_t dpy = pys - pyNew;
1076// Double_t dpz = pl - plNew;
1077// Double_t de = e - eNew;
1078// Double_t dmass2 = de * de - dpx * dpx - dpy * dpy - dpz * dpz;
1079// printf("New mass (1) %e %e %e %e %e %e %e \n", dmass2, jt, jtNew, pl, plNew, e, eNew);
1080// printf("New mass (2) %e %e \n", pxNew, pyNew);
1081 //
1082 // Rotate back
1083 //
1084 TVector3 w(pxNew, pyNew, plNew);
1085 w.RotateY(thetaq[index]); w.RotateZ(phiq[index]);
1086 pxNew = w.X(); pyNew = w.Y(); plNew = w.Z();
1087
1088 p1[index][0] += pxNew;
1089 p1[index][1] += pyNew;
1090 p1[index][2] += plNew;
1091 p1[index][3] += eNew;
1092 //
1093 // Updated 4-momentum vectors
1094 //
1095 pNew[icount][0] = pxNew;
1096 pNew[icount][1] = pyNew;
1097 pNew[icount][2] = plNew;
1098 pNew[icount][3] = eNew;
1099 kNew[icount] = i;
1100 icount++;
1101 } // parton loop
0f482ae4 1102 //
6e90ad26 1103 // Check if there was phase-space for quenching
0f482ae4 1104 //
0f482ae4 1105
6e90ad26 1106 if (icount == 0) quenched[isys] = kFALSE;
1107 if (!quenched[isys]) break;
1108
1109 for (Int_t j = 0; j < 4; j++)
1110 {
1111 p2[isys][j] = p0[isys][j] - p1[isys][j];
1112 }
1113 p2[isys][4] = p2[isys][3] * p2[isys][3] - p2[isys][0] * p2[isys][0] - p2[isys][1] * p2[isys][1] - p2[isys][2] * p2[isys][2];
6e90ad26 1114 if (p2[isys][4] > 0.) {
1115 p2[isys][4] = TMath::Sqrt(p2[isys][4]);
1116 break;
1117 } else {
b280c4cc 1118 printf("Warning negative mass squared in system %d %f ! \n", isys, zquench[isys]);
4e383037 1119 printf("4-Momentum: %10.3e %10.3e %10.3e %10.3e %10.3e \n", p2[isys][0], p2[isys][1], p2[isys][2], p2[isys][3], p2[isys][4]);
6e90ad26 1120 if (p2[isys][4] < -0.01) {
4e383037 1121 printf("Negative mass squared !\n");
1122 // Here we have to put the gluon back to mass shell
1123 // This will lead to a small energy imbalance
1124 p2[isys][4] = 0.;
1125 p2[isys][3] = TMath::Sqrt(p2[isys][0] * p2[isys][0] + p2[isys][1] * p2[isys][1] + p2[isys][2] * p2[isys][2]);
1126 break;
6e90ad26 1127 } else {
1128 p2[isys][4] = 0.;
1129 break;
1130 }
1131 }
6e90ad26 1132 /*
6e90ad26 1133 zHeavy *= 0.98;
1134 printf("zHeavy lowered to %f\n", zHeavy);
1135 if (zHeavy < 0.01) {
1136 printf("No success ! \n");
1137 icount = 0;
1138 quenched[isys] = kFALSE;
1139 break;
1140 }
4e383037 1141 */
1142 } // iteration on z (while)
1143
6e90ad26 1144// Update event record
1145 for (Int_t k = 0; k < icount; k++) {
1146// 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] );
1147 fPyjets->P[0][kNew[k]] = pNew[k][0];
1148 fPyjets->P[1][kNew[k]] = pNew[k][1];
1149 fPyjets->P[2][kNew[k]] = pNew[k][2];
1150 fPyjets->P[3][kNew[k]] = pNew[k][3];
0f482ae4 1151 }
4e383037 1152 //
1153 // Add the gluons
1154 //
1155 Int_t ish = 0;
1837e95c 1156 Int_t iGlu;
4e383037 1157 if (!quenched[isys]) continue;
0f482ae4 1158//
1159// Last parton from shower i
4e383037 1160 Int_t in = klast[isys];
0f482ae4 1161//
1162// Continue if no parton in shower i selected
1163 if (in == -1) continue;
1164//
1165// If this is the second initial parton and it is behind the first move pointer by previous ish
4e383037 1166 if (isys == 1 && klast[1] > klast[0]) in += ish;
0f482ae4 1167//
1168// Starting index
452af8c7 1169
4e383037 1170// jmin = in - 1;
0f482ae4 1171// How many additional gluons will be generated
1172 ish = 1;
4e383037 1173 if (p2[isys][4] > 0.05) ish = 2;
0f482ae4 1174//
1175// Position of gluons
4e383037 1176 iGlu = numpart;
1177 if (iglu == 0) igMin = iGlu;
1178 igMax = iGlu;
0f482ae4 1179 numpart += ish;
1180 (fPyjets->N) += ish;
4e383037 1181
0f482ae4 1182 if (ish == 1) {
4e383037 1183 fPyjets->P[0][iGlu] = p2[isys][0];
1184 fPyjets->P[1][iGlu] = p2[isys][1];
1185 fPyjets->P[2][iGlu] = p2[isys][2];
1186 fPyjets->P[3][iGlu] = p2[isys][3];
1187 fPyjets->P[4][iGlu] = p2[isys][4];
0f482ae4 1188
4e383037 1189 fPyjets->K[0][iGlu] = 1;
1190 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu] = 1;
0f482ae4 1191 fPyjets->K[1][iGlu] = 21;
4e383037 1192 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1193 fPyjets->K[3][iGlu] = -1;
1194 fPyjets->K[4][iGlu] = -1;
4e383037 1195
1196 pg[0] += p2[isys][0];
1197 pg[1] += p2[isys][1];
1198 pg[2] += p2[isys][2];
1199 pg[3] += p2[isys][3];
0f482ae4 1200 } else {
1201 //
1202 // Split gluon in rest frame.
1203 //
4e383037 1204 Double_t bx = p2[isys][0] / p2[isys][3];
1205 Double_t by = p2[isys][1] / p2[isys][3];
1206 Double_t bz = p2[isys][2] / p2[isys][3];
1207 Double_t pst = p2[isys][4] / 2.;
0f482ae4 1208 //
1209 // Isotropic decay ????
1210 Double_t cost = 2. * gRandom->Rndm() - 1.;
60e55aee 1211 Double_t sint = TMath::Sqrt((1.-cost)*(1.+cost));
2ab330c9 1212 Double_t phis = 2. * TMath::Pi() * gRandom->Rndm();
0f482ae4 1213
1214 Double_t pz1 = pst * cost;
1215 Double_t pz2 = -pst * cost;
1216 Double_t pt1 = pst * sint;
1217 Double_t pt2 = -pst * sint;
2ab330c9 1218 Double_t px1 = pt1 * TMath::Cos(phis);
1219 Double_t py1 = pt1 * TMath::Sin(phis);
1220 Double_t px2 = pt2 * TMath::Cos(phis);
1221 Double_t py2 = pt2 * TMath::Sin(phis);
0f482ae4 1222
1223 fPyjets->P[0][iGlu] = px1;
1224 fPyjets->P[1][iGlu] = py1;
1225 fPyjets->P[2][iGlu] = pz1;
1226 fPyjets->P[3][iGlu] = pst;
1227 fPyjets->P[4][iGlu] = 0.;
1228
4e383037 1229 fPyjets->K[0][iGlu] = 1 ;
0f482ae4 1230 fPyjets->K[1][iGlu] = 21;
4e383037 1231 fPyjets->K[2][iGlu] = fPyjets->K[2][in] + 1000;
0f482ae4 1232 fPyjets->K[3][iGlu] = -1;
1233 fPyjets->K[4][iGlu] = -1;
1234
1235 fPyjets->P[0][iGlu+1] = px2;
1236 fPyjets->P[1][iGlu+1] = py2;
1237 fPyjets->P[2][iGlu+1] = pz2;
1238 fPyjets->P[3][iGlu+1] = pst;
1239 fPyjets->P[4][iGlu+1] = 0.;
1240
4e383037 1241 fPyjets->K[0][iGlu+1] = 1;
1242 if (iglu == nGluon[isys] - 1) fPyjets->K[0][iGlu+1] = 1;
0f482ae4 1243 fPyjets->K[1][iGlu+1] = 21;
4e383037 1244 fPyjets->K[2][iGlu+1] = fPyjets->K[2][in] + 1000;
0f482ae4 1245 fPyjets->K[3][iGlu+1] = -1;
1246 fPyjets->K[4][iGlu+1] = -1;
1247 SetMSTU(1,0);
1248 SetMSTU(2,0);
1249 //
1250 // Boost back
1251 //
1252 Pyrobo(iGlu + 1, iGlu + 2, 0., 0., bx, by, bz);
1253 }
4e383037 1254/*
1255 for (Int_t ig = iGlu; ig < iGlu+ish; ig++) {
1256 Double_t px, py, pz;
1257 px = fPyjets->P[0][ig];
1258 py = fPyjets->P[1][ig];
1259 pz = fPyjets->P[2][ig];
1260 TVector3 v(px, py, pz);
1261 v.RotateZ(-phiq[isys]);
1262 v.RotateY(-thetaq[isys]);
1263 Double_t pxs = v.X(); Double_t pys = v.Y(); Double_t pzs = v.Z();
1264 Double_t r = AliPythiaRndm::GetPythiaRandom()->Rndm();
1265 Double_t jtKick = 0.3 * TMath::Sqrt(-TMath::Log(r));
1266 if (ish == 2) jtKick = wjtKick[i] * TMath::Sqrt(-TMath::Log(r)) / TMath::Sqrt(2.);
1267 Double_t phiKick = 2. * TMath::Pi() * AliPythiaRndm::GetPythiaRandom()->Rndm();
1268 pxs += jtKick * TMath::Cos(phiKick);
1269 pys += jtKick * TMath::Sin(phiKick);
1270 TVector3 w(pxs, pys, pzs);
1271 w.RotateY(thetaq[isys]);
1272 w.RotateZ(phiq[isys]);
1273 fPyjets->P[0][ig] = w.X();
1274 fPyjets->P[1][ig] = w.Y();
1275 fPyjets->P[2][ig] = w.Z();
1276 fPyjets->P[2][ig] = w.Mag();
1277 }
1278*/
1279 } // kGluon
1280
6e90ad26 1281
4e383037 1282 // Check energy conservation
0f482ae4 1283 Double_t pxs = 0.;
1284 Double_t pys = 0.;
1285 Double_t pzs = 0.;
1286 Double_t es = 14000.;
1287
1288 for (Int_t i = 0; i < numpart; i++)
1289 {
1290 kst = fPyjets->K[0][i];
1291 if (kst != 1 && kst != 2) continue;
1292 pxs += fPyjets->P[0][i];
1293 pys += fPyjets->P[1][i];
1294 pzs += fPyjets->P[2][i];
1295 es -= fPyjets->P[3][i];
1296 }
1297 if (TMath::Abs(pxs) > 1.e-2 ||
1298 TMath::Abs(pys) > 1.e-2 ||
1299 TMath::Abs(pzs) > 1.e-1) {
1300 printf("%e %e %e %e\n", pxs, pys, pzs, es);
4e383037 1301// Fatal("Quench()", "4-Momentum non-conservation");
452af8c7 1302 }
4e383037 1303
1304 } // end quenching loop (systems)
6e90ad26 1305// Clean-up
0f482ae4 1306 for (Int_t i = 0; i < numpart; i++)
1307 {
4e383037 1308 imo = fPyjets->K[2][i];
1309 if (imo > 1000) {
1310 fPyjets->K[2][i] = fPyjets->K[2][i] % 1000;
1311 }
0f482ae4 1312 }
4e383037 1313// this->Pylist(1);
0f482ae4 1314} // end quench
90d7b703 1315
992f2843 1316
1317void AliPythia::Pyquen(Double_t a, Int_t ibf, Double_t b)
1318{
1319 // Igor Lokthine's quenching routine
12cb0bc0 1320 // http://lokhtin.web.cern.ch/lokhtin/pyquen/pyquen.txt
1321
992f2843 1322 pyquen(a, ibf, b);
1323}
b280c4cc 1324
12cb0bc0 1325void AliPythia::SetPyquenParameters(Double_t t0, Double_t tau0, Int_t nf, Int_t iengl, Int_t iangl)
1326{
1327 // Set the parameters for the PYQUEN package.
1328 // See comments in PyquenCommon.h
1329
1330
1331 PYQPAR.t0 = t0;
1332 PYQPAR.tau0 = tau0;
1333 PYQPAR.nf = nf;
1334 PYQPAR.iengl = iengl;
1335 PYQPAR.iangl = iangl;
1336}
1337
1338
16a82508 1339void AliPythia::Pyevnw()
1340{
1341 // New multiple interaction scenario
1342 pyevnw();
1343}
1344
cd07c39b 1345void AliPythia::Pyshowq(Int_t ip1, Int_t ip2, Double_t qmax)
1346{
1347 // Call medium-modified Pythia jet reconstruction algorithm
1348 //
1349 pyshowq(ip1, ip2, qmax);
1350}
6c43eccb 1351 void AliPythia::Qpygin0()
1352 {
1353 // New multiple interaction scenario
1354 qpygin0();
1355 }
cd07c39b 1356
b280c4cc 1357void AliPythia::GetQuenchingParameters(Double_t& xp, Double_t& yp, Double_t z[4])
1358{
1359 // Return event specific quenching parameters
1360 xp = fXJet;
1361 yp = fYJet;
1362 for (Int_t i = 0; i < 4; i++) z[i] = fZQuench[i];
1363
1364}
1365
3dc3ec94 1366void AliPythia::ConfigHeavyFlavor()
1367{
1368 //
1369 // Default configuration for Heavy Flavor production
1370 //
1371 // All QCD processes
1372 //
1373 SetMSEL(1);
1374
ef185c83 1375
1376 if (fItune < 0) {
1377 // No multiple interactions
1378 SetMSTP(81,0);
1379 SetPARP(81, 0.);
1380 SetPARP(82, 0.);
1381 }
3dc3ec94 1382 // Initial/final parton shower on (Pythia default)
1383 SetMSTP(61,1);
1384 SetMSTP(71,1);
1385
1386 // 2nd order alpha_s
1387 SetMSTP(2,2);
1388
1389 // QCD scales
1390 SetMSTP(32,2);
1391 SetPARP(34,1.0);
1392}
e0e89f40 1393
1394void AliPythia::AtlasTuning()
1395{
1396 //
1397 // Configuration for the ATLAS tuning
0bd3d7c5 1398 if (fItune > -1) return;
1399 printf("ATLAS TUNE \n");
1400
1401 SetMSTP(51, AliStructFuncType::PDFsetIndex(kCTEQ5L)); // CTEQ5L pdf
1402 SetMSTP(81,1); // Multiple Interactions ON
1403 SetMSTP(82,4); // Double Gaussian Model
1404 SetPARP(81,1.9); // Min. pt for multiple interactions (default in 6.2-14)
1405 SetPARP(82,1.8); // [GeV] PT_min at Ref. energy
1406 SetPARP(89,1000.); // [GeV] Ref. energy
1407 SetPARP(90,0.16); // 2*epsilon (exponent in power law)
1408 SetPARP(83,0.5); // Core density in proton matter distribution (def.value)
1409 SetPARP(84,0.5); // Core radius
1410 SetPARP(85,0.33); // Regulates gluon prod. mechanism
1411 SetPARP(86,0.66); // Regulates gluon prod. mechanism
1412 SetPARP(67,1); // Regulates Initial State Radiation
1413}
1414
1415void AliPythia::AtlasTuning_MC09()
1416{
1417 //
1418 // Configuration for the ATLAS tuning
1419 if (fItune > -1) return;
1420 printf("ATLAS New TUNE MC09\n");
1421 SetMSTP(81,21); // treatment for MI, ISR, FSR and beam remnants: MI on, new model
1422 SetMSTP(82, 4); // Double Gaussian Model
1423 SetMSTP(52, 2); // External PDF
1424 SetMSTP(51, 20650); // MRST LO*
1425
1426
1427 SetMSTP(70, 0); // (was 2: def manual 1, def code 0) virtuality scale for ISR
1428 SetMSTP(72, 1); // (was 0: def 1) maximum scale for FSR
1429 SetMSTP(88, 1); // (was 0: def 1) strategy for qq junction to di-quark or baryon in beam remnant
1430 SetMSTP(90, 0); // (was 1: def 0) strategy of compensate the primordial kT
1431
1432 SetPARP(78, 0.3); // the amount of color reconnection in the final state
1433 SetPARP(80, 0.1); // probability of color partons kicked out from beam remnant
1434 SetPARP(82, 2.3); // [GeV] PT_min at Ref. energy
1435 SetPARP(83, 0.8); // Core density in proton matter distribution (def.value)
1436 SetPARP(84, 0.7); // Core radius
1437 SetPARP(90, 0.25); // 2*epsilon (exponent in power law)
1438 SetPARJ(81, 0.29); // (was 0.14: def 0.29) Labmda value in running alpha_s for parton showers
1439
1440 SetMSTP(95, 6);
1441 SetPARJ(41, 0.3); // a and b parameters of the symmm. Lund FF
1442 SetPARJ(42, 0.58);
1443 SetPARJ(46, 0.75); // mod. of the Lund FF for heavy end-point quarks
1444 SetPARP(89,1800.); // [GeV] Ref. energy
e0e89f40 1445}
e8a8adcd 1446
1447AliPythia& AliPythia::operator=(const AliPythia& rhs)
1448{
1449// Assignment operator
1450 rhs.Copy(*this);
1451 return *this;
1452}
1453
1454 void AliPythia::Copy(TObject&) const
1455{
1456 //
1457 // Copy
1458 //
1459 Fatal("Copy","Not implemented!\n");
1460}
cd07c39b 1461
03358a32 1462void AliPythia::DalitzDecays()
1463{
1464
1465 //
1466 // Replace all omega dalitz decays with the correct matrix element decays
1467 //
1468 Int_t nt = fPyjets->N;
1469 for (Int_t i = 0; i < nt; i++) {
1470 if (fPyjets->K[1][i] != 223) continue;
1471 Int_t fd = fPyjets->K[3][i] - 1;
1472 Int_t ld = fPyjets->K[4][i] - 1;
1473 if (fd < 0) continue;
1474 if ((ld - fd) != 2) continue;
1475 if ((fPyjets->K[1][fd] != 111) ||
ba4e47a0 1476 ((TMath::Abs(fPyjets->K[1][fd+1]) != 11) && (TMath::Abs(fPyjets->K[1][fd+1]) != 13)))
1477 continue;
03358a32 1478 TLorentzVector omega(fPyjets->P[0][i], fPyjets->P[1][i], fPyjets->P[2][i], fPyjets->P[3][i]);
ba4e47a0 1479 Int_t pdg = TMath::Abs(fPyjets->K[1][fd+1]);
1480 fOmegaDalitz.Decay(pdg, &omega);
03358a32 1481 for (Int_t j = 0; j < 3; j++) {
1482 for (Int_t k = 0; k < 4; k++) {
1483 TLorentzVector vec = (fOmegaDalitz.Products())[2-j];
1484 fPyjets->P[k][fd+j] = vec[k];
1485 }
1486 }
1487 }
1488}